WO2021248463A1

WO2021248463A1 - Techniques for enhanced semi-static codebooks

Info

Publication number: WO2021248463A1
Application number: PCT/CN2020/095852
Authority: WO
Inventors: Jing Dai; Chao Wei; Chenxi HAO
Original assignee: Qualcomm Incorporated
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2021-12-16

Abstract

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may monitor a set of downlink occasions for one or more downlink messages from a base station. The UE may generate a codebook comprising an information bit for each of the one or more downlink messages. In some examples, the codebook may include one or more repetitions of the information bit based on a quantity of slots of the one or more downlink messages. Additionally or alternatively, the UE may determine a grouping of the set of downlink occasions, and the codebook may include an information bit for each subset of the set of monitoring occasions based on the grouping. The UE may transmit the codebook to the base station after the set of downlink occasions.

Description

TECHNIQUES FOR ENHANCED SEMI-STATIC CODEBOOKS

TECHNICAL FIELD

The following relates generally to wireless communications and more specifically to techniques for enhanced semi-static codebooks.

DESCRIPTION OF THE RELATED TECHNOLOGY

Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (for example, time, frequency, and power) . Examples of such multiple-access systems include fourth generation (4G) systems such as Long Term Evolution (LTE) systems, LTE-Advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems which may be referred to as New Radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA) , time division multiple access (TDMA) , frequency division multiple access (FDMA) , orthogonal frequency division multiple access (OFDMA) , or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) . A wireless multiple-access communications system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .

In some wireless communications systems, a UE may communicate with a base station using feedback, such as hybrid automatic repeat request (HARQ) feedback. For example, the wireless communication system may use HARQ feedback transmissions to correct errors in transmitted data, in which the feedback may include an acknowledgement (ACK) or a negative acknowledgement (NACK) . Such feedback, however, may be relatively inefficient (for example, the feedback may use relatively high signaling overhead) or may be relatively unreliable, or both.

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support techniques for enhanced semi-static codebooks. Generally, the described techniques relate to relatively more efficient and reliable codebooks for feedback between devices, such as hybrid automatic repeat request (HARQ) feedback from a user equipment (UE) to a base station.

For example, a wireless communications system may support semi-static codebook-based HARQ feedback. In some examples, a UE may monitor for one or more downlink messages from a base station (for example, scheduled physical downlink shared channel (PDSCH) transmissions) over one or more monitoring occasions. The UE may determine whether the one or more downlink messages were successfully received (for example, successfully decoded) by the UE. The UE may generate a codebook, such as a HARQ codebook, based on the determination. In such systems, the UE may transmit, to the base station, a set of information bits within the HARQ codebook.

The UE may include some information, such as one or more information bits, in the codebook for at least some if not each of the one or more downlink messages. For example, the UE may include an ACK feedback bit for a message if the message was successfully received, and a NACK feedback bit if the message was unsuccessfully received. In some examples, the UE may include one or more repetitions of the information bit in the codebook. For example, a downlink message may be transmitted via a set of slots and the UE may be configured to report an information bit for each slot of the set of slots (for example, a quantity of bits may correspond to a quantity of the set of slots) . The UE may include a first information bit as an ACK or a NACK for a slot of the set, and the UE may repeat the first information bit for the remaining slots of the set. Such techniques may improve the reliability of providing the feedback, among other advantages.

Additionally or alternatively, the UE may implement one or more techniques to reduce a size of codebook, among other advantages. For example, the UE may determine a grouping of a set of monitored downlink occasions. The UE may report one or more information bits for a subset of the set of monitored downlink occasions based on the grouping (for example, the UE may report a feedback bit for multiple slots associated with a downlink message) .

One innovative aspect of the subject matter described in this disclosure can be implemented in a method for wireless communication. The method includes monitoring a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a set of slots, generating, based on the monitoring, a codebook including an information bit for each of the one or more downlink messages, where a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message, and transmitting, via an uplink control channel, the codebook to the base station after the set of downlink occasions.

Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus includes a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to monitor a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a set of slots, generate, based on the monitoring, a codebook including an information bit for each of the one or more downlink messages, where a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message, and transmit, via an uplink control channel, the codebook to the base station after the set of downlink occasions.

Another innovative aspect of the subject matter described in this disclosure can be implemented in another apparatus for wireless communication. The apparatus includes means for monitoring a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a set of slots, generating, based on the monitoring, a codebook including an information bit for each of the one or more downlink messages, where a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message, and transmitting, via an uplink control channel, the codebook to the base station after the set of downlink occasions.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a non-transitory computer-readable medium for wireless communication. The code may include instructions executable by a processor to monitor a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a set of slots, generate, based on the monitoring, a codebook including an information bit for each of the one or more downlink messages, where a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message, and transmit, via an uplink control channel, the codebook to the base station after the set of downlink occasions.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a method for wireless communication. The method includes monitoring a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a set of slots, determining a grouping of the set of downlink occasions based on a quantity of the set of slots, generating a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, where the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions, and transmitting, via an uplink control channel, the codebook to the base station after the set of downlink occasions.

Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus includes a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to monitor a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a set of slots, determine a grouping of the set of downlink occasions based on a quantity of the set of slots, generate a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, where the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions, and transmit, via an uplink control channel, the codebook to the base station after the set of downlink occasions.

Another innovative aspect of the subject matter described in this disclosure can be implemented in another apparatus for wireless communication. The apparatus includes means for monitoring a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a set of slots, determining a grouping of the set of downlink occasions based on a quantity of the set of slots, generating a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, where the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions, and transmitting, via an uplink control channel, the codebook to the base station after the set of downlink occasions.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a non-transitory computer-readable medium for wireless communication. The code may include instructions executable by a processor to monitor a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a set of slots, determine a grouping of the set of downlink occasions based on a quantity of the set of slots, generate a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, where the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions, and transmit, via an uplink control channel, the codebook to the base station after the set of downlink occasions.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a method for wireless communication. The method includes transmitting one or more downlink messages to a UE via a set of downlink occasions, each of the one or more downlink messages corresponding to a set of slots and receiving, via an uplink control channel, a codebook from the UE based on transmitting the one or more downlink messages, the codebook including an information bit for each of the one or more downlink messages, where a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message.

Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus includes a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to transmit one or more downlink messages to a UE via a set of downlink occasions, each of the one or more downlink messages corresponding to a set of slots and receive, via an uplink control channel, a codebook from the UE based on transmitting the one or more downlink messages, the codebook including an information bit for each of the one or more downlink messages, where a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message.

Another innovative aspect of the subject matter described in this disclosure can be implemented in another apparatus for wireless communication. The apparatus includes means for transmitting one or more downlink messages to a UE via a set of downlink occasions, each of the one or more downlink messages corresponding to a set of slots and receiving, via an uplink control channel, a codebook from the UE based on transmitting the one or more downlink messages, the codebook including an information bit for each of the one or more downlink messages, where a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a non-transitory computer-readable medium for wireless communication. The code may include instructions executable by a processor to transmit one or more downlink messages to a UE via a set of downlink occasions, each of the one or more downlink messages corresponding to a set of slots and receive, via an uplink control channel, a codebook from the UE based on transmitting the one or more downlink messages, the codebook including an information bit for each of the one or more downlink messages, where a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a method for wireless communication. The method includes transmitting one or more downlink messages to a UE via a set of downlink occasions, each of the one or more downlink messages corresponding to a set of slots, determining a grouping of the set of downlink occasions based on a quantity of the set of slots, and receiving, via an uplink control channel, a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, where the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions.

Another innovative aspect of the subject matter described in this disclosure can be implemented in an apparatus for wireless communication. The apparatus includes a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to transmit one or more downlink messages to a UE via a set of downlink occasions, each of the one or more downlink messages corresponding to a set of slots, determine a grouping of the set of downlink occasions based on a quantity of the set of slots, and receive, via an uplink control channel, a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, where the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions.

Another innovative aspect of the subject matter described in this disclosure can be implemented in another apparatus for wireless communication. The apparatus includes means for transmitting one or more downlink messages to a UE via a set of downlink occasions, each of the one or more downlink messages corresponding to a set of slots, determining a grouping of the set of downlink occasions based on a quantity of the set of slots, and receiving, via an uplink control channel, a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, where the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions.

Another innovative aspect of the subject matter described in this disclosure can be implemented in a non-transitory computer-readable medium for wireless communication. The code may include instructions executable by a processor to transmit one or more downlink messages to a UE via a set of downlink occasions, each of the one or more downlink messages corresponding to a set of slots, determine a grouping of the set of downlink occasions based on a quantity of the set of slots, and receive, via an uplink control channel, a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, where the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 illustrates an example of a system for wireless communications that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure.

Figure 2 illustrates an example of a wireless communications system that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure.

Figures 3–7 illustrate examples of feedback schemes that support techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure.

Figure 8 illustrates an example of a process flow that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure.

Figures 9 and 10 show block diagrams of devices that support techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure.

Figure 11 shows a block diagram of a communications manager that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure.

Figure 12 shows a diagram of a system including a device that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure.

Figures 13 and 14 show block diagrams of devices that support techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure.

Figure 15 shows a block diagram of a communications manager that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure.

Figure 16 shows a diagram of a system including a device that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure.

Figures 17–20 show flowcharts illustrating methods that support techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure.

DETAILED DESCRIPTION

In some wireless communications systems, a user equipment (UE) may use feedback techniques, such as hybrid automatic repeat request (HARQ) feedback techniques, to ensure reception of data transmitted within the system. For example, a UE may send feedback, such as HARQ feedback transmissions, that include an acknowledgement (ACK) or negative acknowledgement (NACK) about data transmitted to the UE. A flexible frame structure and dynamic indications of HARQ feedback timing may be used. As such, a time offset between reception of a downlink message (for example, a physical downlink shared channel (PDSCH) , a physical downlink control channel (PDCCH) , and so on) and transmission of corresponding HARQ feedback may be variable. The system may also utilize codebook-based HARQ feedback, in which multiple HARQ feedback transmissions may be transmitted simultaneously on a single feedback occasion, and respective information bits representing detected messages may be encoded in a HARQ codebook.

In some implementations, a UE may transmit different types of HARQ codebooks. For example a dynamic codebook may be used, in which information bits may be dynamically added to the codebook based on, for example, the detection of a downlink message. Additionally or alternatively, a semi-static codebook may be used, in which a HARQ feedback bit for a potential downlink message may be reserved in a semi-static codebook (for example, the UE may be configured to monitor a quantity of candidate PDSCH occasions, and the UE may report a codebook including an information bit for each of the quantity of occasions) . However, such feedback may be relatively inefficient. For example, the UE may be configured with a relatively large quantity of candidate PDSCH occasions to monitor for a relatively small quantity of scheduled downlink messages. In such cases, the UE may report a relatively large quantity of “dummy” bits for the PDSCH occasions that the messages were not received, which may result in relatively unreliable signaling, or inefficient signaling, or both.

Various aspects generally relate to techniques for relatively more efficient and reliable codebooks for feedback, such as HARQ feedback, and more specifically to techniques for including repetitions of information bits in a codebook, or including information bits in a codebook for one or more subsets of the downlink occasions from a group of downlink occasions. For example, a UE may monitor for downlink messages (for example, scheduled PDSCH transmissions) over one or more monitoring occasions configured by a base station (for example, via radio resource control (RRC) signaling) . The UE may determine whether one or more downlink messages were successfully received (for example, successfully decoded) based on the monitoring. The UE may generate a semi-static codebook based on the determination. The UE may include an information bit for each of the one or more downlink messages in the codebook. For example, the UE may include an ACK feedback bit for a message if the message was successfully received and a NACK feedback bit if the message was unsuccessfully received.

In some examples, the UE may include one or more repetitions of the information bit in the codebook. For example, a downlink message may be transmitted via a set of slots and the UE may be configured to report a bit for one or more slots of the set of slots (for example, a monitoring window may include one or more slots of the set of slots and the UE may include a bit for each of the one or more slots in the monitoring window) . The UE may include a first information bit as an ACK or a NACK for a monitoring occasion (for example, a slot including the downlink message) . Additionally or alternatively, the UE may include one or more repetitions of the first information bit for at least some if not all remaining slots of the one or more slots (for example, if a downlink message associated with four slots in a monitoring window is successfully received, the UE may include four ACK bits in the codebook, among other examples) .

Additionally or alternatively, the UE may determine a grouping of a set of downlink occasions. For example, the UE may receive control signaling indicating the set of downlink occasions (for example, the UE may be configured to report a set of bits in a HARQ codebook for the respective set of downlink occasions) . The UE may determine a quantity of subsets of the set of downlink occasions (for example, the UE may divide a monitoring window of slots into a quantity of multi-slot candidate occasions such as PDSCH occasions) . The UE may include an information bit in the codebook for each subset of the downlink occasions. In some examples, the UE may monitor a subset of downlink occasions (for example, multiple slots) for a first downlink message, and the UE may include a first information bit for the first downlink message in the codebook (for example, the UE may report an ACK or a NACK based on whether the first downlink message was successfully received) .

Particular implementations of the subject matter described in this disclosure may be implemented to realize one or more of potential advantages. In some implementations, devices in a wireless communications system may realize reduced signaling overhead, for example, by reducing a size of a codebook, such as a HARQ codebook (for example, due to reporting an information bit for the grouped candidate downlink occasions) . Additionally or alternatively, the devices may realize improved reliability of feedback, such as HARQ feedback, for example, by including one or more repetitions of an information bit in the codebook.

Aspects of the disclosure are initially described in the context of wireless communications systems. Aspects of the disclosure are then described in the context of feedback schemes and process flows. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to techniques for enhanced semi-static codebooks.

Figure 1 illustrates an example of a wireless communications system 100 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. The wireless communications system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communications system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communications system 100 may support enhanced broadband communications, ultra-reliable (for example, mission critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

The base stations 105 may be dispersed throughout a geographic area to form the wireless communications system 100 and may be devices in different forms or having different capabilities. The base stations 105 and the UEs 115 may wirelessly communicate via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base station 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which a base station 105 and a UE 115 may support the communication of signals according to one or more radio access technologies.

The UEs 115 may be dispersed throughout a coverage area 110 of the wireless communications system 100, and each UE 115 may be stationary, or mobile, or both at different times. The UEs 115 may be devices in different forms or having different capabilities. Some example UEs 115 are illustrated in Figure 1. The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115, the base stations 105, or network equipment (for example, core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment) , as shown in Figure 1.

The base stations 105 may communicate with the core network 130, or with one another, or both. For example, the base stations 105 may interface with the core network 130 through one or more backhaul links 120 (for example, via an S1, N2, N3, or other interface) . The base stations 105 may communicate with one another over the backhaul links 120 (for example, via an X2, Xn, or other interface) either directly (for example, directly between base stations 105) , or indirectly (for example, via core network 130) , or both. In some examples, the backhaul links 120 may be or include one or more wireless links.

One or more of the base stations 105 described herein may include or may be referred to by a person having ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB) , a next- generation NodeB or a giga-NodeB (either of which may be referred to as a gNB) , a Home NodeB, a Home eNodeB, or other suitable terminology.

A UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, in which the “device” may also be referred to as a unit, a station, a terminal, or a client, among other examples. A UE 115 may also include or may be referred to as a personal electronic device such as a cellular phone, a personal digital assistant (PDA) , a tablet computer, a laptop computer, or a personal computer. In some examples, a UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communications (MTC) device, among other examples, which may be implemented in various objects such as appliances, or vehicles, meters, among other examples.

The UEs 115 described herein may be able to communicate with various types of devices, such as other UEs 115 that may sometimes act as relays as well as the base stations 105 and the network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples, as shown in Figure 1.

The UEs 115 and the base stations 105 may wirelessly communicate with one another via one or more communication links 125 over one or more carriers. The term “carrier” may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication links 125. For example, a carrier used for a communication link 125 may include a portion of a radio frequency spectrum band (for example, a bandwidth part (BWP) ) that is operated according to one or more physical layer channels for a given radio access technology (for example, LTE, LTE-A, LTE-A Pro, NR) . Each physical layer channel may carry acquisition signaling (for example, synchronization signals, system information) , control signaling that coordinates operation for the carrier, user data, or other signaling. The wireless communications system 100 may support communication with a UE 115 using carrier aggregation or multi-carrier operation. A UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplexing (FDD) and time division duplexing (TDD) component carriers.

Signal waveforms transmitted over a carrier may be made up of multiple subcarriers (for example, using multi-carrier modulation (MCM) techniques such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM) ) . In a system employing MCM techniques, a resource element may consist of one symbol period (for example, a duration of one modulation symbol) and one subcarrier, in which the symbol period and subcarrier spacing are inversely related. The quantity of bits carried by each resource element may depend on the modulation scheme (for example, the order of the modulation scheme, the coding rate of the modulation scheme, or both) . Thus, the more resource elements that a UE 115 receives and the higher the order of the modulation scheme, the higher the data rate may be for the UE 115. A wireless communications resource may refer to a combination of a radio frequency spectrum resource, a time resource, and a spatial resource (for example, spatial layers or beams) , and the use of multiple spatial layers may further increase the data rate or data integrity for communications with a UE 115.

The time intervals for the base stations 105 or the UEs 115 may be expressed in multiples of a basic time unit which may, for example, refer to a sampling period of T _s= 1/ (Δf _max·N _f) seconds, in which Δf _max may represent the maximum supported subcarrier spacing, and N _f may represent the maximum supported discrete Fourier transform (DFT) size. Time intervals of a communications resource may be organized according to radio frames each having a specified duration (for example, 10 milliseconds (ms) ) . Each radio frame may be identified by a system frame number (SFN) (for example, ranging from 0 to 1023) .

Each frame may include multiple consecutively numbered subframes or slots, and each subframe or slot may have the same duration. In some examples, a frame may be divided (for example, in the time domain) into subframes, and each subframe may be further divided into a quantity of slots. Alternatively, each frame may include a variable quantity of slots, and the quantity of slots may depend on subcarrier spacing. Each slot may include a quantity of symbol periods (for example, depending on the length of the cyclic prefix prepended to each symbol period) . In some wireless communications systems 100, a slot may further be divided into multiple mini-slots containing one or more symbols. Excluding the cyclic prefix, each symbol period may contain one or more (for example, N _f) sampling periods. The duration of a symbol period may depend on the subcarrier spacing or frequency band of operation.

A subframe, a slot, a mini-slot, or a symbol may be the smallest scheduling unit (for example, in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI) . In some examples, the TTI duration (for example, the quantity of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (for example, in bursts of shortened TTIs (sTTIs) ) .

Physical channels may be multiplexed on a carrier according to various techniques. A physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using one or more of time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. A control region (for example, a control resource set (CORESET) ) for a physical control channel may be defined by a quantity of symbol periods and may extend across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (for example, CORESETs) may be configured for a set of the UEs 115. For example, one or more of the UEs 115 may monitor or search control regions for control information according to one or more search space sets, and each search space set may include one or multiple control channel candidates in one or more aggregation levels arranged in a cascaded manner. An aggregation level for a control channel candidate may refer to a quantity of control channel resources (for example, control channel elements (CCEs) ) associated with encoded information for a control information format having a given payload size. Search space sets may include common search space sets configured for sending control information to multiple UEs 115 and UE-specific search space sets for sending control information to a specific UE 115.

In some examples, a base station 105 may be movable and therefore provide communication coverage for a moving geographic coverage area 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, the overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communications system 100 may include, for example, a heterogeneous network in which different types of the base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

The wireless communications system 100 may be configured to support ultra-reliable communications or low-latency communications, or various combinations thereof. For example, the wireless communications system 100 may be configured to support ultra-reliable low-latency communications (URLLC) or mission critical communications. The UEs 115 may be designed to support ultra-reliable, low-latency, or critical functions (for example, mission critical functions) . Ultra-reliable communications may include private communication or group communication and may be supported by one or more mission critical services such as mission critical push-to-talk (MCPTT) , mission critical video (MCVideo) , or mission critical data (MCData) . Support for mission critical functions may include prioritization of services, and mission critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, mission critical, and ultra-reliable low-latency may be used interchangeably herein.

In some examples, a UE 115 may also be able to communicate directly with other UEs 115 over a device-to-device (D2D) communication link 135 (for example, using a peer-to-peer (P2P) or D2D protocol) . One or more UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105 or be otherwise unable to receive transmissions from a base station 105. In some examples, groups of the UEs 115 communicating via D2D communications may utilize a one-to-many (1: M) system in which each UE 115 transmits to every other UE 115 in the group. In some examples, a base station 105 facilitates the scheduling of resources for D2D communications. In other examples, D2D communications are carried out between the UEs 115 without the involvement of a base station 105.

The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or 5G core (5GC) , which may include at least one control plane entity that manages access and mobility (for example, a mobility management entity (MME) , an access and mobility management function (AMF) ) and at least one user plane entity that routes packets or interconnects to external networks (for example, a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management for the UEs 115 served by the base stations 105 associated with the core network 130. User IP packets may be transferred through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to the network operators IP services 150. The operators IP services 150 may include access to the Internet, Intranet (s) , an IP Multimedia Subsystem (IMS) , or a Packet-Switched Streaming Service.

Some of the network devices, such as a base station 105, may include subcomponents such as an access network entity 140, which may be an example of an access node controller (ANC) . Each access network entity 140 may communicate with the UEs 115 through one or more other access network transmission entities 145, which may be referred to as radio heads, smart radio heads, or transmission/reception points (TRPs) . Each access network transmission entity 145 may include one or more antenna panels. In some configurations, various functions of each access network entity 140 or base station 105 may be distributed across various network devices (for example, radio heads and ANCs) or consolidated into a single network device (for example, a base station 105) .

The wireless communications system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz) . Generally, the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from approximately one decimeter to one meter in length. The UHF waves may be blocked or redirected by buildings and environmental features, but the waves may penetrate structures sufficiently for a macro cell to provide service to the UEs 115 located indoors. The transmission of UHF waves may be associated with smaller antennas and shorter ranges (for example, less than 100 kilometers) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.

The wireless communications system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communications system 100 may employ License Assisted Access (LAA) , LTE-Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band such as the 5 GHz industrial, scientific, and medical (ISM) band. If operating in unlicensed radio frequency spectrum bands, devices such as the base stations 105 and the UEs 115 may employ carrier sensing for collision detection and avoidance. In some examples, operations in unlicensed bands may be based on a carrier aggregation configuration in conjunction with component carriers operating in a licensed band (for example, LAA) . Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

A base station 105 or a UE 115 may be equipped with multiple antennas, which may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of a base station 105 or a UE 115 may be located within one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations. A base station 105 may have an antenna array with a quantity of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115. Likewise, a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, an antenna panel may support radio frequency beamforming for a signal transmitted via an antenna port.

Beamforming, which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (for example, a base station 105, a UE 115) to shape or steer an antenna beam (for example, a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that some signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference. The adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying amplitude offsets, phase offsets, or both to signals carried via the antenna elements associated with the device. The adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (for example, with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation) .

The UEs 115 and the base stations 105 may support retransmissions of data to increase the likelihood that data is received successfully. Hybrid automatic repeat request (HARQ) feedback is one technique for increasing the likelihood that data is received correctly over a communication link 125. HARQ procedures may include a combination of error detection (for example, using a cyclic redundancy check (CRC) ) , forward error correction (FEC) , and retransmission (for example, automatic repeat request (ARQ) ) . HARQ procedures may improve throughput at the medium access control (MAC) layer in poor radio conditions (for example, low signal-to-noise conditions) . In some examples, a device may support same-slot HARQ feedback, in which the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot. In other examples, the device may provide HARQ feedback in a subsequent slot or according to some other time interval.

The wireless communications system 100 may support codebook-based HARQ feedback (for example, using a Type 2 HARQ codebook) . As such, a UE 115 may transmit a set of information bits within a HARQ codebook to a base station 105. The UE 115 may also monitor for downlink transmissions (for example, PDSCH, PDCCH, or both) over one or more monitoring occasions (for example, configured via control signaling, such as RRC signaling, from the base station 105) . The UE 115 may indicate, using respective information bits within the HARQ codebook, whether each detected downlink transmission was decoded successfully by the UE 115. If communicating the HARQ codebook, the UE 115 or the base station 105 may implement one or more of the techniques described herein.

For example, the UE 115 may include an information bit for each of the one or more downlink messages in the codebook. For example, the UE 115 may include an ACK feedback bit for a message if the message was successfully received and a NACK feedback bit if the message was unsuccessfully received. In some examples, the UE 115 may include one or more repetitions of the information bit in the codebook. For example, a downlink message may be transmitted via a set of slots and the UE 115 may be configured to report a bit for at least one slot of the set of slots (for example, a monitoring window may include one or more slots of the set of slots, and the UE 115 may include a bit for each of the one or more slots in the monitoring window) . The UE 115 may include a first information bit as an ACK or a NACK for a monitoring occasion (for example, a slot including the downlink message) . Additionally or alternatively, the UE 115 may include a repetition of the first information bit for each of the remaining slots of the one or more slots (for example, if a downlink message associated with four slots in a monitoring window is successfully received, the UE 115 may include four ACK bits in the codebook, among other examples) .

Additionally or alternatively, the UE 115 may determine a grouping of a set of downlink occasions. For example, the UE 115 may receive control signaling indicating the set of downlink occasions (for example, the UE 115 may be configured to report a set of bits in a HARQ codebook for the respective set of downlink occasions) . The UE 115 may determine a quantity of subsets of the set of downlink occasions (for example, the UE 115 may divide a monitoring window of slots into a quantity of multi-slot candidate PDSCH occasions) . The UE 115 may include an information bit for each subset of downlink occasions in the codebook. In some examples, the UE 115 may monitor a subset of downlink occasions (for example, multiple slots) for a first downlink message, and the UE 115 may include a first information bit for the first downlink message in the codebook (for example, the UE 115 may report an ACK or a NACK based on whether the first downlink message was successfully received) .

Figure 2 illustrates an example of a wireless communications system 200 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. In some examples, the wireless communications system 200 may implement aspects of wireless communications system 100. For example, the wireless communications system 200 may include a UE 115-a and a base station 105-a, which may be examples of the corresponding devices described with reference to Figure 1. The wireless communications system 200 may support the use of enhanced semi-static codebooks to improve the efficiency and the reliability of HARQ processes.

In some examples, the UE 115-a and the base station 105-a may communicate using one or more downlink transmissions 205 and uplink transmissions 210. For example, the base station 105-a may send downlink transmissions 205 on a PDSCH. The UE 115-a may receive data transmitted by the base station 105-a and may send feedback via uplink transmissions 210 (for example, on a physical uplink control channel (PUCCH) ) . In some examples, the downlink transmissions 205 may include one or more downlink messages 215 and the uplink transmissions 210 may include HARQ feedback 220 (for example, HARQ feedback including a semi-static HARQ codebook) .

According to some aspects, the UE 115-a may transmit the HARQ feedback 220 to base station 105-a. For example, the base station 105-a may send data transmissions (for example, downlink messages 215) to the UE 115-a. The UE 115-a may use the HARQ feedback 220 to indicate successful or unsuccessful reception of the transmitted data. For example, the UE 115-a may send feedback transmissions (for example, HARQ feedback 220) that may include an ACK bit or a NACK bit for a data message detected by the UE 115-a (for example, a downlink message 215 scheduled via downlink control information (DCI) from the base station 105-a) . In such examples, the UE 115-a may monitor for the downlink messages 215 sent by the base station 105-a over one or more monitoring occasions (for example, durations over which the UE 115-a monitors a set of resources to identify data sent to the UE 115-a from the base station 105-a) .

In some examples, the wireless communications system 200 may use a flexible frame structure and a dynamic indication (for example, indicated via DCI) of PDSCH-to-HARQ feedback timing. As such, a time offset between PDSCH reception and the HARQ feedback 220 in the wireless communications system 200 may be variable. In some examples, the wireless communications system 200 may use codebook-based HARQ feedback 220. For example, a HARQ codebook including multiple HARQ information bits (for example, ACK/NACK for respective downlink messages 215) may be transmitted simultaneously on a single feedback occasion (for example, via a PUCCH) , in which HARQ feedback bits may be encoded in a HARQ codebook.

In some examples, the UE 115-a may transmit one or more semi-static HARQ codebooks in the HARQ feedback 220. The UE 115-a may include a set of bits in a semi-static HARQ codebook. For example, the UE 115-a may be configured with a set of occasions to monitor for one or more scheduled downlink messages 215, and the UE 115-a may include a bit for each of the set of occasions.

As described herein, the UE 115-a may include an information bit for each of the one or more downlink messages 215 (for example, transmitted over a configured monitoring window of slots) in a codebook. For example, the UE 115-a may include an ACK feedback bit for a downlink message 215 if the downlink message 215 was successfully received, and a NACK feedback bit if the downlink message 215 was unsuccessfully received. In some examples, the UE 115-a may include one or more repetitions of the information bit in the codebook. For example, a downlink message 215 may be transmitted via a set of slots and the UE 115-a may be configured to report a bit for at least one slot of the set of slots (for example, a monitoring window may include one or more slots of the set of slots, and the UE 115-a may include a bit for each of the one or more slots in the monitoring window) . The UE 115-a may include a first information bit as an ACK or a NACK for a given monitoring occasion (for example, a slot including the downlink message) . Additionally or alternatively, the UE 115-a may include a repetition of the first information bit for each remaining slot of the one or more slots (for example, if a downlink message 215 associated with four slots in a monitoring window is successfully received, the UE 115-a may include four ACK bits in the codebook, among other examples) .

Additionally or alternatively, the UE 115-a or the base station 105-a may determine a grouping of a set of downlink occasions and may generate a codebook based on the grouping of the set of the downlink occasions. For example, the UE 115-a may receive control signaling indicating the set of downlink occasions (for example, the UE 115-a may be configured to report a set of bits in a HARQ codebook for the respective set of downlink occasions) . The UE 115-a (or the base station 105-a) may determine a quantity of subsets of the set of downlink occasions (for example, the UE 115-a may divide a monitoring window of slots into a quantity of multi-slot candidate PDSCH occasions) . The UE 115-a may include an information bit for each subset of downlink occasions in the codebook. In some examples, the UE 115-a may monitor a subset of downlink occasions (for example, multiple slots) for a first downlink message 215, and the UE 115-a may include a first information bit for the first downlink message 215 in the codebook (for example, the UE 115-a may report an ACK or a NACK for the subset of downlink occasions based on whether the first downlink message 215 was successfully received) . The UE 115-a may transmit a codebook to the base station 105-a via HARQ feedback 220, and the base station 105-a may perform one or more feedback procedures based on the received codebook (for example, the base station 105-a may retransmit a message if a NACK is indicated for a downlink message 215, among other examples of feedback procedures) .

Figure 3 illustrates an example of a feedback scheme 300 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. In some examples, the feedback scheme 300 may implement or may be implemented by aspects of the

wireless communications systems

100 or 200. For example, the feedback scheme 300 may illustrate an example of communications between a UE 115 and a base station 105, which may be examples of the corresponding devices described herein. Generally, the feedback scheme 300 may illustrate an example scheme for communicating a semi-static HARQ codebook.

A HARQ codebook may be transmitted via the PUCCH 330-a (for example, a UE 115 may transmit HARQ feedback using a configured slot 305-g on uplink resources 315) . For example, a semi-static HARQ codebook may include a set of bits corresponding to the PDSCH occasions 320 and the PDSCH 325 (for example, downlink messages from the base station received over a slot 305 on downlink resources 310) .

In some wireless communications systems (for example, NR systems) , a HARQ codebook may correspond to one or more dimensions. For example, the one or more dimensions may include a cell dimension for HARQ-ACK multiplexing across multiple carriers of a downlink carrier aggregation (CA) configuration, a transport block (TB) dimension for HARQ-ACK multiplexing across a quantity of TBs of a PDSCH (for example, two TBs if two continuous wave (CW) transmissions are configured) , a code block group (CBG) dimension for HARQ-ACK multiplexing across CBGs within a TB (for example, if CBG-based retransmissions are configured) , or any combination thereof. Additionally or alternatively, the one or more dimensions may include a time dimension for HARQ-ACK multiplexing across multiple slots 305 (for example, downlink slots 305 for downlink resources 310, such as candidate PDSCH occasions 320) .

Such wireless communications systems may support semi-static HARQ codebooks, dynamic HARQ codebooks, or both. For example, a wireless communications system may support a semi-static HARQ codebook as part of providing HARQ feedback. In some examples, a pre-configured or pre-defined set of PDSCH-to-PUCCH slot offset (for example, a parameter K1) values may be used to determine the time (for example, the slot 305) dimension of the HARQ codebook. For example, the set of values may be configured at a UE (for example, by a base station) and the set of values may indicate a time offset between the slot 305-g for the PUCCH 330-a and a PDSCH occasion 320 (for example, the set of values may indicate a quantity of slots 305 between the slot 305-g and the slot 305-a, the slot 305-b, the slot 305-d, the slot 305-e, and the slot 305-f for PDSCH occasions 320, among other examples) . The codebook may be generated such that HARQ-ACK bits may correspond to each candidate PDSCH occasion. For example, a semi-static codebook may be configured with five PDSCH occasions 320 (for example, downlink resources 310 to monitor over the slot 305-a, the slot 305-b, the slot 305-d, the slot 305-e, and the slot 305-f for PDSCH 325) . The UE may report an information bit for each PDSCH occasion 320 including a PDSCH 325 and one or more “dummy” bits for each PDSCH occasion 320 that does not include a PDSCH 325. For example, the UE may include an ACK or NACK bit for the PDSCH 325-a, the PDSCH 325-b, and the PDSCH 325-c based on whether the respective PDSCH 325 was successfully received. Additionally or alternatively, the UE may be configured to “pad” the codebook with two dummy bits for the PDSCH occasion 320-b and 320-e. In some examples, the UE may report a NACK bit (for example, a bit value of 0) for candidate PDSCH occasions 320 (for example, the candidate PDSCH occasion 320-b and the candidate PDSCH occasion 320-e) that do not include a scheduled PDSCH 325.

In some examples, a UE may be configured with a set of K1 values {1, 2, 3, 5, 6} indicating the slot 305-f, the slot 305-e, the slot 305-d, the slot 305-b, and the slot 305-a, respectively. The UE may monitor the PDSCH occasions 320 on the downlink resources 310 for the indicated slots. The UE is also scheduled with PDSCHs 325 for one or more of the candidate PDSCH occasions 320.

The UE may construct a codebook based on the set of values and the monitoring. For example, the UE may construct a codebook with HARQ-ACK feedback bits of {A0AA0} corresponding to the slot 305-a, the slot 305-b, the slot 305-d, the slot 305-e, and the slot 305-f, respectively. Each of the ‘A’ bits may represent an information bit (for example, an ACK bit of ‘1’ or a NACK bit of ‘0’ ) associated with a PDSCH 325, and the ‘0’ bits may represent “dummy bits” for PDSCH occasions 320 without scheduled PDSCHs 325. In some examples, the other dimensions of the feedback scheme 300 may include a cell dimension (for example, a single-CC dimension) , a TB dimension (for example, a single TB dimension) , and a CBG dimension may not be configured, although any examples of such dimensions may be used. The UE may provide feedback, such as HARQ feedback, that may include the codebook.

However, in some cases using other techniques different than those disclosed herein, feedback may be relatively inefficient, or relatively unreliable, or both. For example, transmitting the dummy bits may result in a relatively higher signaling overhead or there may be relatively poor channel conditions resulting in an information bit being unsuccessfully communicated to a base station.

In contrast, as described herein, a UE and a base station may implement one or more techniques to realize enhanced semi-static HARQ codebooks. For example, a UE may include one or more repetitions of the information bit in the codebook. For example, a downlink message may be transmitted via a set of slots 305 and the UE may be configured to report a bit for at least one slot 305 of the set of slots 305 (for example, a monitoring window may include one or more slots 305 of the set of slots 305, and the UE may include a bit for each of the one or more slots 305 in the monitoring window) . The UE may include a first information bit as an ACK or a NACK for a PDSCH occasion 320 (for example, a slot 305 including the downlink message) . Additionally or alternatively, the UE may include a repetition of the first information bit for each remaining slot 305 of the one or more slots 305 (for example, if a downlink message associated with four slots 305 in a monitoring window is successfully received, the UE may include four ACK bits in the codebook, among other examples) , which may increase reliability of the transmitted codebook.

Additionally or alternatively, the UE may determine a grouping of a set of PDSCH occasions 320. For example, the UE may receive control signaling indicating the set of PDSCH occasions 320 (for example, the UE may be configured to report a set of bits in a HARQ codebook for the respective set of PDSCH occasions 320) . The UE may determine a quantity of subsets of the set of PDSCH occasions 320 (for example, the UE may divide a monitoring window of slots 305 into a quantity of multi-slot candidate PDSCH occasions 320) . The UE may include an information bit for each subset of PDSCH occasions 320 in the codebook. In some examples, the UE may monitor a subset of PDSCH occasions 320 (for example, multiple slots 305) for a first downlink message, and the UE may include a first information bit for the first downlink message in the codebook (for example, the UE may report an ACK or a NACK based on whether the first downlink message was successfully received) . Such a grouping may result in enhanced communication efficiency (for example, the UE may transmit a relatively smaller codebook, which may result in reduced signaling overhead) .

Figure 4 illustrates an example of a feedback scheme 400 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. In some examples, the feedback scheme 400 may implement or may be implemented by aspects of the

wireless communications systems

100 or 200. For example, the feedback scheme 400 may illustrate an example of communications between a UE 115 and a base station 105, which may be examples of the corresponding devices described herein. Generally, the feedback scheme 400 may illustrate an example of PDSCH slot aggregation.

Some wireless communications systems (for example, NR) may support slot aggregation. For example, a wireless communications system may support repeated transmission of a downlink message over successive slots 405 (for example, a downlink message may be transmitted over multiple slots 405 and may be referred to as a multi-slot PDSCH message) . Such slot aggregation may result in an increased signal to noise ratio (SNR) for transmission reliability, among other benefits. The feedback scheme 400 shows a multi-slot PDSCH 415-a (for example, repeated transmission of a downlink message over the slot 405-b, the slot 405-c, the slot 405-d, and the slot 405-e) on downlink resources 410, although the PDSCH 415-a may cover any quantity of slots in other examples. As an example, a downlink message may be transmitted over the slot 405-b, and the downlink message may be retransmitted over each of the slot 405-c, the slot 405-d, and the slot 405-e.

A UE may determine one or more parameters for receiving the PDSCH 415-a. For example, the UE may receive DCI from a base station and the DCI may schedule the PDSCH 415-a. For example, the DCI may include a resource allocation for the PDSCH 415-a (for example, the resource allocation may indicate the slots 405 and the downlink resources 410 for the PDSCH 415-a) . The DCI may indicate a modulation and coding scheme (MCS) for receiving the PDSCH 415-a. In some examples, the resource allocation, or the MCS, or both may be common over the successive slots of the PDSCH 415-a. In some examples, the quantity of slots of the PDSCH 415-a may be RRC configured (for example, two slots, four slots, eight slots, among other examples) and may be common for each scheduling of the downlink message (for example, a new transmission of the downlink message and a retransmission of the downlink message in different slots of the PDSCH 415-a may be configure with the same quantity of slots) .

In some examples, for each slot of the multi-slot PDSCH 415-a, a transmission block (for example, a downlink message) may be the same and the encoded bits may be different for different slots. For example, a redundancy version (RV) of a first slot of the PDSCH 415-a may be different than a RV of a second slot of the PDSCH 415-a. In some examples, a RV of a first slot (for example, the slot 405-b) may be indicated in the scheduling DCI and a RV of each of one or more remaining slots (for example, the slot 405-c, the slot 405-d, and the slot 405-e) may be determined by the equation n mod 4, in which n may represent the “nth” slot of the multiple slots (for example, for a second slot 405-c, n may be a value of 2) . In some examples, for a new transmission of a four slot PDSCH 415-a, each of a set of RV values {RV0, RV2, RV3, RV1} may correspond to a respective slot (for example, the slot 405-b, the slot 405-c, the slot 405-d, and the slot 405-e, respectively) . For a retransmission of a four slot PDSCH 415-a, each of a set of RV values {RV3, RV1, RV0, RV2} may correspond to a respective slot (for example, the slot 405-b, the slot 405-c, the slot 405-d, and the slot 405-e, respectively) .

As described herein, a UE and a base station may implement one or more techniques to realize enhanced semi-static HARQ codebooks for the PDSCH 415-a. For example, a UE may monitor for downlink messages over one or more PDSCH occasions configured by the base station (for example, via RRC signaling) . The UE may determine whether one or more downlink messages were successfully received (for example, successfully decoded) based on the monitoring. The UE may generate a semi-static codebook based on the determination. The UE may include an information bit for each of the one or more downlink messages in the codebook.

In some examples, the UE may include one or more repetitions of the information bit in the codebook. For example, a downlink message may be transmitted via a set of slots 405 and the UE may be configured to report a bit for at least one slot 405 of the set of slots 405 (for example, a monitoring window may include one or more slots 405 of the set of slots 405, and the UE may include a bit for each of the one or more slots 405 in the monitoring window) . The UE may include a first information bit as an ACK or a NACK for a PDSCH occasion (for example, a slot 405 including the downlink message) . Additionally or alternatively, the UE may include a repetition of the first information bit for each remaining slot 405 of the one or more slots 405 (for example, if a downlink message associated with four slots 405 in a monitoring window is successfully received, the UE may include four ACK bits in the codebook) , which may increase reliability of the transmitted codebook.

In some examples, the UE may determine a grouping of a set of PDSCH occasions. For example, the UE may receive control signaling indicating the set of PDSCH occasions (for example, the UE may be configured to report a set of bits in a HARQ codebook for the respective set of PDSCH occasions) . The UE may determine a quantity of subsets of the set of PDSCH occasions (for example, the UE may divide a monitoring window of slots 405 into a quantity of multi-slot candidate PDSCH occasions 420) . The UE may include an information bit for each subset of PDSCH occasions in the codebook. In some examples, the UE may monitor a subset of PDSCH occasions (for example, multiple slots 405) for a first downlink message, and the UE may include a first information bit for the first downlink message in the codebook (for example, the UE may report an ACK or a NACK based on whether the first downlink message was successfully received) . Such a grouping may result in enhanced communication efficiency (for example, the UE may transmit a relatively smaller codebook, which may result in reduced signaling overhead) .

Figure 5 illustrates examples of

feedback schemes

500 and 501 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. In some examples, the

feedback schemes

500 and 501 may implement or may be implemented by aspects of the

wireless communications systems

100 or 200. For example, the

feedback schemes

500 and 501 may illustrate an example of communications between a UE 115 and a base station 105, which may be examples of the corresponding devices described herein.

The

feedback schemes

500 and 501 illustrate example downlink resources 510 and uplink resources 515 for multi-slot PDSCHs 520. In some examples, one or more codebooks associated with the

feedback schemes

500 and 501 may be associated with one or more dimensions as described herein (for example, the feedback scheme 500 and the feedback scheme 501 may illustrate a single CC, a single TB, and no CBG configured) .

The feedback scheme 500 is associated with an example communication of a semi-static HARQ codebook for scheduled downlink messages (for example, transmitted over multi-slot PDSCHs 520 as described herein) . The feedback scheme 500 may include slots 505, downlink resources 510-a, uplink resources 515-a, a PDSCH 520-a, a PDSCH 520-b, a window 525-a, and a PUCCH 530-a.

A UE may be configured with a set of values (for example, a set of parameters K1) indicating slots 505 of the monitoring window 525-a for the UE to monitor for downlink messages. Additionally or alternatively, the UE may be scheduled with two downlink messages. For example, the UE may receive DCI indicating a first downlink message over the PDSCH 520-a (for example, a base station may transmit a same TB of the first downlink message with different RVs in the slot 505-a, the slot 505-b, the slot 505-c, and the slot 505-d) . The UE may receive DCI indicating a second downlink message over the PDSCH 520-b (for example, a base station may transmit a same TB of the second downlink message with different RVs in the slot 505-e, the slot 505-f, the slot 505-g, and the slot 505-h) .

The UE may generate (for example, construct) a HARQ codebook to provide feedback for the scheduled multi-slot PDSCHs 520 via the PUCCH 530-a in the slot 505-i. For example, the UE may include a feedback bit for each slot 505 of the configured monitoring window 525-a. In some examples, a multi-slot PDSCH 520 may correspond to a single HARQ-ACK bit in a semi-static HARQ codebook. In some examples for the feedback scheme 500, the UE may be configured with a K1 value set of {1, 2, 3, 4, 5, 6, 7, 8} indicating the respective slots 505 of the window 525-a. The UE may construct an 8-bit codebook for the 8 monitoring occasions (for example, the 8 slots 505 in the window 525-a) , as shown in Table 1.

Table 1

In Table 1, “A” bits may represent information bits transmitted at an end slot of a PDSCH 520 (for example, an ACK bit or a NACK bit indicating whether the PDSCH 520 was successfully received and decoded) , and ‘0’ bits may represent dummy bits (for example, the UE may report NACK values for remaining slots 505 of a PDSCH 520) .

As another illustrative example, the feedback scheme 501 may include slots 505, downlink resources 510-b, uplink resources 515-b, a PDSCH 520-c, a PDSCH 520-d, a window 525-b, and a PUCCH 530-b. A UE may be configured with a set of values (for example, a set of parameters K1) indicating slots 505 of the monitoring window 525-b for the UE to monitor for downlink messages. Additionally or alternatively, the UE may be scheduled with two downlink messages. For example, the UE may receive DCI indicating a downlink message over the PDSCH 520-c (for example, a base station may transmit a same TB of the downlink message with different RVs in the slot 505-j, the slot 505-k, the slot 505-l, and the slot 505-m) . As shown, the monitoring window 525-b may partially include the PDSCH 520-c and fully include the PDSCH 520-d. For example, the UE may monitor the occasions of the slot 505-l and the slot 505-m, and the UE may refrain from monitoring the occasions of the slot 505-j and the slot 505-k (for example, based on the set of values not indicating the slot 505-j and the slot 505-k) . The DCI may indicate a second downlink message over the PDSCH 520-b (for example, a base station may transmit a same TB of the second downlink message with different RVs in the slot 505-o, the slot 505-p, the slot 505-q, and the slot 505-r) . The slot 505-n may include a monitoring occasion of the downlink resources 510-b indicated by the set of values. The monitoring occasion of the slot 505-n may not be scheduled with a PDSCH 520.

The UE may generate (for example, construct) a HARQ codebook to provide feedback for the scheduled multi-slot PDSCHs 520 of the feedback scheme 501 via the PUCCH 530-b in the slot 505-t. For example, the UE may include a feedback bit for each slot 505 of the configured monitoring window 525-b. In some examples, a multi-slot PDSCH 520 may correspond to a single HARQ-ACK bit in a semi-static HARQ codebook. In some examples for the feedback scheme 501, the UE may be configured with a K1 value set of {1, 2, 3, 4, 5, 6, 7, 8} indicating the respective slots 505 of the window 525-b. The UE may construct an 8-bit codebook for the 8 monitoring occasions (for example, the 8 slots 505 in the window 525-a) , as show in Table 2.

Table 2

In Table 2, “A” bits may represent information bits transmitted at an end slot of a PDSCH 520 (for example, an ACK bit or a NACK bit indicating whether the PDSCH 520 was successfully received and decoded) , and ‘0’ bits may represent dummy bits (for example, the UE may report NACK values for remaining slots 505 of a PDSCH 520) .

The example codebooks illustrated by Table 1 and Table 2 may include two information bits for PDSCHs 520 and six dummy bits for the remaining monitoring occasions of the windows 525. In some cases, using techniques different from those described herein, such codebooks may result in relatively inefficient or unreliable communications. For example, transmitting the dummy bits may result in a relatively higher signaling overhead or a higher coding rate (for example, a coding rate greater than a threshold coding rate) , resulting in an information bit being unsuccessfully communicated to a base station (for example, an information bit represented by “A” may be incorrectly received) .

As described herein, a UE and a base station may implement one or more techniques to realize enhanced semi-static HARQ codebooks. For example, a UE may include one or more repetitions of an information bit in the codebook. For example, a downlink message may be transmitted via a set of slots 505 and the UE may be configured to report a bit for at least one slot 505 of the set of slots 505 (for example, a monitoring window 525 may include one or more slots 505 of the set of slots 505, and the UE may include a bit for each of the one or more slots 505 in the monitoring window) . The UE may include a first information bit as an ACK or a NACK, for example, corresponding to a first slot 505 of a PDSCH 520 (for example, the first slot 505 within a window 525) . The UE may include a repetition of the first information bit for each of one or more remaining slots 505 of the slots 505 in the monitoring window 525 (for example, the UE may include four ACK bits in the codebook if a downlink message associated with four slots 505 that are fully included in a monitoring window 525 is successfully received, the UE may two ACK bits in the codebook if a downlink message associated with four slots 505 includes two slots 505 that are included in a monitoring window 525, among other examples) , which may increase reliability of the transmitted codebook. For example, if the first information bit is lost due to noise or other factors, the base station may identify a repetition of the first information bit in another entry of the codebook as corresponding to the downlink message (for example, the PDSCH 520) .

Additionally or alternatively, the UE may determine a grouping of a set of PDSCH occasions (or slots 505) . For example, the UE may receive control signaling indicating the set of PDSCH occasions (for example, the UE may be configured to report a set of bits in a HARQ codebook for the respective set of PDSCH occasions) . The UE may determine a quantity of subsets of the set of PDSCH occasions (for example, the UE may divide a monitoring window 525 into a quantity of multi-slot candidate PDSCH occasions) . The UE may include an information bit for each subset of PDSCH occasions in the codebook. In some examples, the UE may monitor a subset of PDSCH occasions (for example, multiple slots 505) for a first downlink message, and the UE may include a first information bit for the first downlink message in the codebook (for example, the UE may report an ACK or a NACK based on whether the first downlink message was successfully received) . The UE may continue such operations for one or more additional downlink messages (for example, each downlink message may be associated with a subset of PDSCH occasions) . Such a grouping may result in enhanced communication efficiency (for example, the UE may transmit a relatively smaller codebook, which may result in reduced signaling overhead) .

Figure 6 illustrates an example of a feedback scheme 600 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. In some examples, the feedback scheme 600 may implement or may be implemented by aspects of the

wireless communications systems

100 or 200. For example, the feedback scheme 600 illustrates an example of communications between a UE 115 and a base station 105, which may be examples of the corresponding devices described herein. The feedback scheme 600 may illustrate examples of slots 605, downlink resources 610, uplink resources 615, PDSCHs 620, a window 625, and a PUCCH 630, which may be examples of the corresponding elements described herein. Generally, the feedback scheme 600 may illustrate an example of communicating a HARQ codebook including one or more repetitions of information bits.

A UE may be configured with a set of values (for example, a set of parameters K1 indicated via RRC signaling) indicating slots 605 of the monitoring window 625 for the UE to monitor for downlink messages. For example, the UE may determine candidate PDSCH occasions to monitor for the PDSCHs 620 based on the set of values indicating a slot offset between the PUCCH 630 and a respective candidate PDSCH occasion. In some examples, the UE may be configured with a K1 value set of {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} indicating the slot 605-l, the slot 605-k, the slot 605-j, the slot 605-i, the slot 605-h, the slot 605-g, the slot 605-f, the slot 605-e, the slot 605-d, and the slot 605-c, respectively, of the window 625.

The UE may be scheduled with one or more downlink messages. For example, the UE may receive DCI indicating the PDSCH 620-a, the PDSCH 620-b, and the PDSCH 620-c. In some examples, the base station may transmit a same TB of a downlink message with different RVs for different slots 605 of a PDSCH 620. For example, the base station may send a downlink message over a first slot of a PDSCH 620 using a first RV, the base station may send the downlink message over a second slot of the PDSCH 620 using a second RV, and so on. In some examples, a multi-slot PDSCH 620 may be a new transmission of a downlink message. In some other examples, a multi-slot PDSCH 620 may be a retransmission of the downlink message as described herein.

The UE may generate (for example, construct) a HARQ codebook to provide feedback for the scheduled multi-slot PDSCHs 620 in accordance with the techniques described herein. For example, the UE may transmit a feedback message indicating the codebook via the PUCCH 630 in the slot 605-m. The UE may include a feedback bit for each slot 605 of the configured monitoring window 625. For example, the UE may include an information bit corresponding to each PDSCH 620 and one or more repetitions of the information bit based on a quantity of slots 605 associated with a PDSCH 620 that are included in the window 625.

In some examples, the UE may be configured with a K1 value set of {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} indicating the respective slots 605 of the window 625. The UE may construct a 10 bit codebook for the 10 monitoring occasions indicated by the set of K1 values (for example, the 10 slots 605 in the window 625) . For example, the UE may include an information bit for each PDSCH 620 in an entry of the codebook corresponding, for example, to an end slot 605 (for example, an ACK or NACK bit associated with the slot 605-d may be included for the PDSCH 620-a, an ACK or NACK bit associated with the slot 605-h may be included for the PDSCH 620-b, an ACK or NACK bit associated with the slot 605-l may be included for the PDSCH 620-c, among other examples) .

The UE may include one or more repetitions of an information bit for a PDSCH 620. For example, the UE may report an information bit and a repetition of the information bit for the slot 605-c and the slot 605-d included in the window 625 (for example, the information bit and the repetition of the bit indicating whether the downlink message of PDSCH 620-a that is partially included in the window 625 was successfully received) , the UE may report a second information bit and one or more repetitions of the second information bit for the slot 605-e, the slot 605-f, the slot 605-g, and the slot 605-h, respectively, and so on. Such a codebook including an information bit for a PDSCH 620 and one or more repetitions is illustrated in Table 3.

Table 3

In Table 3, “A” bits may represent information bits for a PDSCH 620 (for example, an ACK bit or a NACK bit indicating whether a respective PDSCH 620 was successfully received and decoded) . For example, “A1” bits may represent an information bit and one or more repetitions of the information bit for a first downlink message (for example, associated with the PDSCH 620-a) , “A2” bits may represent an information bit and one or more repetitions of the information bit for a second downlink message (for example, associated with the PDSCH 620-b) , and “A3” bits may represent an information bit and one or more repetitions of the information bit for a third downlink message (for example, associated with the PDSCH 620-c) . In other words, a HARQ-ACK bit may be reported for a first PDSCH occasion of a multi-slot PDSCH 620, and one or more repetitions of the HARQ-ACK bit for the multi-slot PDSCH 620 may be repeated for remaining candidate PDSCH occasions (for example, when a semi-static HARQ codebook includes scheduled slot repetitions of the multi-slot PDSCH 620) . As an illustrative example, the UE may successfully (or unsuccessfully) receive the downlink message in either or both of the slot 605-c or slot 605-d of the PDSCH 620-a and A1 may be an example of an ACK bit (or a NACK bit) .

In some examples, implementing the repetitions of the information bits may realize one or more potential advantages. For example, using HARQ-ACK bit positions of a codebook that correspond to “redundant” candidate PDSCH occasions to repeat the HARQ-ACK bits of a multi-slot PDSCH (for example, rather than reporting dummy bits for the “redundant” candidate PDSCH occasions) may improve reliability of the codebook (for example, the base station may be relatively more likely to successfully decode the information bit and perform one or more feedback procedures) .

Although illustrated as four-slot PDSCHs 620 with the described dimensions for semi-static HARQ codebook reporting, any quantity or configuration of slots for a PDSCH 620 or a monitoring window 625 may be used. Additionally, more or less PDSCHs 620 may be scheduled, there may be one or more occasions without a scheduled PDSCH 620 (for example, the UE may implement dummy bits for occasions that do not correspond to a PDSCH) , or any combination thereof.

Figure 7 illustrates an example of a feedback scheme 700 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. In some examples, the feedback scheme 700 may implement or may be implemented by aspects of the

wireless communications systems

100 or 200. For example, the feedback scheme 700 may illustrate an example of communications between a UE 115 and a base station 105, which may be examples of the corresponding devices described herein. The feedback scheme 700 illustrates examples of slots 705, downlink resources 710, uplink resources 715, PDSCHs 720, a window 725, and a PUCCH 730, which may be examples of the corresponding elements described herein. Generally, the feedback scheme 700 illustrates an example of communicating a HARQ codebook in accordance with a grouping of monitoring occasions into subsets 735.

A UE may be configured with a set of values (for example, a set of parameters K1 indicated via RRC signaling) indicating slots 705 of the monitoring window 725 for the UE to monitor for downlink messages. For example, the UE may determine candidate PDSCH occasions to monitor for the PDSCHs 720 based on the set of values indicating a slot offset between the PUCCH 730 and a respective candidate PDSCH occasion. In some examples, the UE may be configured with a K1 value set of {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} indicating the slot 705-l, the slot 705-k, the slot 705-j, the slot 705-i, the slot 705-h, the slot 705-g, the slot 705-f, the slot 705-e, the slot 705-d, and the slot 705-c, respectively, of the window 625 (for example, the UE may determine a configured set of monitoring occasions on the downlink resources 710 based on the set of values) .

The UE may be scheduled with one or more downlink messages. For example, the UE may receive DCI indicating the PDSCH 720-a, the PDSCH 720-b, the PDSCH 720-c, or any combination thereof. In some examples, the base station may transmit a same TB of a downlink message with different RVs for different respective slots 705 of a PDSCH 720. For example, the base station may send a downlink message over a first slot of a PDSCH 720 using a first RV, the base station may send the downlink message over a second slot of the PDSCH 720 using a second RV, and so on. In some examples, a multi-slot PDSCH 720 may be a new transmission of a downlink message. In some other examples, a multi-slot PDSCH 720 may be a retransmission of the downlink message as described herein. The UE may generate (for example, construct) a HARQ codebook to provide feedback for the scheduled multi-slot PDSCHs 720 in accordance with the techniques described herein. For example, the UE may transmit a feedback message indicating the codebook via the PUCCH 730 in the slot 705-m.

In some examples, the UE may be configured with PDSCH slot aggregation (for example, an M-slot PDSCH in which M is greater than 1, among other examples) . In such example, the UE may generate a semi-static HARQ codebook based on a grouping of the configured set of monitoring occasions. For example, the UE may determine one or more subsets 735 of the set of occasions of the window 725. In some examples, each subset 735 may correspond to a respective PDSCH 720 (for example, a respective downlink message) . For example, the subset 735-a may correspond to the PDSCH 720-a, the subset 735-b may correspond to the PDSCH 720-b, and the subset 735-c may correspond to the PDSCH 720-c. In some examples, a subset 735 may be referred to as a multi-slot candidate PDSCH occasion (for example, a candidate PDSCH occasion may be bundled with M slots and referred to as a multi-slot candidate PDSCH occasion) .

Additionally or alternatively, the grouping may be determined based on one or more values of the configured set of K1 values (for example, a maximum K1 parameter and a minimum K1 parameter of the set of values) , a quantity of slots of the PDSCHs 720, or both. For example, the UE may be pre-configured with the set of K1 values {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} and the UE may determine a maximum value of 10 and a minimum value of 1 of the pre-configured value set. The UE may divide the window 725 into the subsets 735 (for example, the multi-slot candidate PDSCH occasions) using the maximum value, the minimum value, the quantity of slots of a PDSCH 720, a slot location in which the PUCCH 730 is located, or any combination thereof.

In some examples, the window 725 (for example, the window of slots from n _U-K1 _max to n _U-K1 _min, in which n _U represents the slot 705-m in which the PUCCH 730 is located) may be split into a quantity of subsets 735 according to Equation (1) :

In Equation (1) , the Quantity of multi slot candidate PDSCH occasions may represent the quantity of subsets 735 (for example, three subsets 735 in the example of the feedback scheme 700) , the K1 _max may represent a maximum K1 value in the pre-configured set of values, the K1 _min may represent a minimum K1 value in the pre-configured set of values, and M may represent the quantity of slots of the PDSCHs 720.

In some examples, the UE may determine that the first or last mod (K1 _max-K1 _min+1, M) slots 705 of the window 725 may be a multi-slot candidate PDSCH occasion with a quantity of slots 705 less than M (for example, the subset 735-a may include two slots 705-c and 705-d as shown in the feedback scheme 700, or the subset 735-c may include the last two slots 705-k and 705-l of the window 725) .

In some examples, a scheduled PDSCH 720 may be partially located within a subset 735 (for example, the PDSCH 720-a may include four slots and only two slots may be located within the candidate PDSCH occasion represented by the subset 735-a) . In some examples, a scheduled PDSCH 720 may be fully located within a subset 735 (for example, the PDSCH 720-b may include four slots and the four slots may be located within the subset 735-b) .

The UE may generate a codebook in accordance with the grouping. For example, the UE may include an information bit (for example, a HARQ feedback bit such as an ACK or a NACK) corresponding to a subset 735 in a codebook. In some examples, the information bit of a PDSCH 720 may correspond to the subset 735 (for example, the multi-slot candidate PDSCH occasion) in which the ending slot of the PDSCH 720 is located. As an example, the PDSCH 720-a may be associated with the subset 735-a due to the last slot 705-d of the PDSCH 720-a being included in the subset 735-a.

In some examples of the feedback scheme 700, a codebook indicating feedback for the one or more downlink messages of the PDSCHs 720 is illustrated in Table 4.

Table 4

In Table 4, “A” bits may represent information bits for a PDSCH 720 (for example, an ACK bit or a NACK bit indicating whether a respective PDSCH 720 was successfully received and decoded) . For example, the “A1” bit may represent an information bit for a first downlink message (for example, associated with the PDSCH 720-a) , the “A2” bit may represent an information bit for a second downlink message (for example, associated with the PDSCH 720-b) , and the “A3” bit may represent an information bit for a third downlink message (for example, associated with the PDSCH 720-c) .

In some examples, the base station may transmit one or more DCI formats to schedule PDSCHs 720. For example, the base station may transmit a DCI format 1_1 or a DCI format 1_2 to schedule a multi-slot PDSCH 720 (for example, if the UE is configured with PDSCH slot aggregation) . Additionally or alternatively, the base station may transmit a DCI format 1_0 (for example, the DCI format 1_0 may be a fallback DCI format) . In some examples, the DCI format 1_0 may support single-slot PDSCH scheduling (for example, for single TB and non-CBG based downlink messages) but may not support multi-slot PDSCH scheduling.

The UE or the base station may implement one or more rules, for example, to ensure co-existence of the grouping described herein with single-slot PDSCHs 720 scheduled by a DCI format 1_0. In some examples, the UE or the base station may determine that a total quantity of single-slot PDSCHs 720, an end slot of a multi-slot PDSCH 720, or both, satisfies a threshold (for example, that the total quantity of single-slot PDSCHs 720 or the end slot of the multi-slot PDSCH 720 is at most 1) . Additionally or alternatively, the UE or the base station may use multiple HARQ codebooks. For example, the UE may report information bits (for example, HARQ-ACK bits) for single-slot PDSCHs 720 in a first HARQ codebook and information bits for multi-slot PDSCHs 720 in a second HARQ codebook. Additionally or alternatively, the UE may report the information bits for the single-slot PDSCHs 720 in a first sub-codebook of a HARQ codebook and the information bits for the multi-slot PDSCHs 720 in a second sub-codebook of the HARQ codebook.

In some examples, implementing the grouping described herein may realize one or more potential advantages. For example, by dividing the occasions of the window 725 into subsets including multiple PDSCH occasions, devices herein may realize improved communication efficiency (for example, reduced signaling overhead due to a reduced size of the semi-static codebook) , among other advantages.

Although illustrated as four slot PDSCHs 620 with the described dimensions for semi-static HARQ codebook reporting, any quantity or configuration of slots for a PDSCH 720 or a monitoring window 725 may be used. Additionally, more or less PDSCHs 720 may be scheduled, there may be one or more occasions without a scheduled PDSCH 720 (for example, the UE may implement dummy bits for occasions that do not correspond to a PDSCH 720) , a UE or a base station may perform any of the operations described herein (for example, a base station may determine the grouping and subsets 735 in addition or alternative to the UE) , or any combination thereof.

Figure 8 illustrates an example of a process flow 800 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. In some examples, the process flow 800 may implement or may be implemented by aspects of the

wireless communications systems

100 or 200. For example, the process flow 800 may include a UE 115-b and a base station 105-b, which may be examples of the corresponding devices described with reference to Figures 1 and 2. In the following description of the process flow 800, the operations between the UE 115-b and the base station 105-b may be performed in a different order than the example order shown, or the operations performed by the UE 115-b and the base station 105-b may be performed in different orders or at different times. Some operations may also be omitted from the process flow 800, and other operations may be added to the process flow 800. The process flow 800 may illustrate the use of one or more feedback schemes as described herein to realize enhanced semi-static HARQ codebooks.

At 805, the UE 115-b may monitor for messages. For example, the UE 115-b may be configured with a set of values (for example, a set of K1 parameters) via control signaling. The UE 115-b may monitor downlink PDSCH occasions for one or more downlink messages (for example, PDSCH transmissions) scheduled by the base station 105-b based on the set of values. At 810, the base station 810 may transmit the one or more downlink messages to the UE 115-b. For example, the base station 810 may send the downlink messages over at least a portion of the PDSCH occasions indicated by the set of values.

At 815, the UE 115-b may generate a codebook. For example, the UE 115-b may use the techniques described herein to construct a semi-static HARQ codebook. In some examples, the UE 115-b may determine a grouping of the configured PDSCH occasions and report an information bit for each downlink message based on the grouping, as described with reference to Figure 7. Additionally or alternatively, the UE 115-b may include one or more information bits in the codebook as described with reference to Figure 6. The information bit(s) for each downlink message may indicate whether the downlink message was successfully detected, received, or decoded at the UE 115-b (for example, an ACK bit may indicate a successful reception of a downlink message and a NACK bit may indicate an unsuccessful reception of the downlink message) .

At 820, the UE 115-b may transmit the HARQ codebook to the base station 105-b. For example, the UE 115-b may use PUCCH resources in a slot subsequent to the monitored PDSCH occasions to transmit the codebook as part of a HARQ feedback procedure. At 825, the base station 105-b may decode the received codebook. For example, the base station 105-b may determine whether one or more downlink messages were successfully received. In some examples, the base station 105-b may determine that a message was not successfully received (for example, the codebook includes a NACK for a PDSCH transmission) . In such examples, the base station 105-b may retransmit the message.

Figure 9 shows a block diagram of a device 905 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. The device 905 may be an example of aspects of a UE 115 as described herein. The device 905 may include a receiver 910, a communications manager 915, and a transmitter 920. The device 905 can be implemented, at least in part, by one or both of a modem and a processor. Each of these components may be in communication with one another (for example, via one or more buses) .

The receiver 910 may receive information such as packets, user data, or control information associated with various information channels (for example, control channels, data channels, and information related to techniques for enhanced semi-static codebooks, among other examples) . Information may be passed on to other components of the device 905. The receiver 910 may be an example of aspects of the transceiver 1220 described with reference to Figure 12. The receiver 910 may utilize a single antenna or a set of antennas.

The communications manager 915 may monitor a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a set of slots, generate, based on the monitoring, a codebook including an information bit for each of the one or more downlink messages, in which a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message, and transmit, via an uplink control channel, the codebook to the base station after the set of downlink occasions. The communications manager 915 may also determine a grouping of the set of downlink occasions based on a quantity of the set of slots, generate a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, in which the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions, and transmit, via an uplink control channel, the codebook to the base station after the set of downlink occasions.

The communications manager 915 as described herein may be implemented to realize one or more potential advantages. Some implementations may allow the device 905 (for example, a processor of the device 905) to improve communications efficiency by reducing a size of a HARQ codebook. For example, the device 905 may determine a grouping of candidate occasions and may report an information bit for each subset of occasions based on the grouping, which may result in less signaling overhead, among other advantages as described herein.

The transmitter 920 may transmit signals generated by other components of the device 905. In some examples, the transmitter 920 may be collocated with a receiver 910 in a transceiver component. For example, the transmitter 920 may be an example of aspects of the transceiver 1220 described with reference to Figure 12. The transmitter 920 may utilize a single antenna or a set of antennas.

Figure 10 shows a block diagram of a device 1005 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. The device 1005 may be an example of aspects of a device 905, or a UE 115 as described herein. The device 1005 may include a receiver 1010, a communications manager 1015, and a transmitter 1040. The device 1005 can be implemented, at least in part, by one or both of a modem and a processor. Each of these components may be in communication with one another (for example, via one or more buses) .

The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (for example, control channels, data channels, and information related to techniques for enhanced semi-static codebooks, among other examples) . Information may be passed on to other components of the device 1005. The receiver 1010 may be an example of aspects of the transceiver 1220 described with reference to Figure 12. The receiver 1010 may utilize a single antenna or a set of antennas.

The communications manager 1015 may be an example of aspects of the communications manager 915 as described herein. The communications manager 1015 may include a monitoring component 1020, a codebook component 1025, a codebook transmitter 1030, and a grouping component 1035. The communications manager 1015 may be an example of aspects of the communications manager 1210 described herein.

The monitoring component 1020 may monitor a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a set of slots.

The codebook component 1025 may generate, based on the monitoring, a codebook including an information bit for each of the one or more downlink messages, in which a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message.

The codebook component 1025 may generate a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, in which the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions.

The codebook transmitter 1030 may transmit, via an uplink control channel, the codebook to the base station after the set of downlink occasions.

The grouping component 1035 may determine a grouping of the set of downlink occasions based on a quantity of the set of slots.

The transmitter 1040 may transmit signals generated by other components of the device 1005. In some examples, the transmitter 1040 may be collocated with a receiver 1010 in a transceiver component. For example, the transmitter 1040 may be an example of aspects of the transceiver 1220 described with reference to Figure 12. The transmitter 1040 may utilize a single antenna or a set of antennas.

Figure 11 shows a block diagram of a communications manager 1105 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. The communications manager 1105 may be an example of aspects of a communications manager 915, a communications manager 1015, or a communications manager 1210 described herein. The communications manager 1105 may include a monitoring component 1110, a codebook component 1115, a codebook transmitter 1120, a control component 1125, a message receiver 1130, a slot component 1135, a grouping component 1140, a value set component 1145, a window component 1150, a subset component 1155, and a DCI component 1160. Each of these components may communicate, directly or indirectly, with one another (for example, via one or more buses) .

The monitoring component 1110 may monitor a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a set of slots.

The codebook component 1115 may generate, based on the monitoring, a codebook including an information bit for each of the one or more downlink messages, in which a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message. In some examples, the codebook component 1115 may generate a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, in which the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions. In some examples, determining a second portion of the codebook including a second information bit corresponding to a second slot for a second downlink message of the one or more downlink messages, in which the second portion of the codebook includes one or more repetitions of the second information bit based on a second quantity of slots of the second downlink message.

In some examples, the codebook component 1115 may generate a second codebook for at least the one downlink message corresponding to the single slot. In some examples, the one or more downlink messages include one or more physical downlink shared channel messages, the information bit includes a hybrid automatic repeat request feedback bit, or both. In some examples, the codebook includes a second information bit corresponding to a second subset of the set of downlink occasions based on the grouping.

The codebook transmitter 1120 may transmit, via an uplink control channel, the codebook to the base station after the set of downlink occasions. In some examples, the codebook transmitter 1120 may transmit the second codebook to the base station. In some examples, the codebook includes a first quantity of bits associated with the first downlink message and a second quantity of bits associated with a second downlink message, in which the first quantity of bits is different than the second quantity of bits.

The grouping component 1140 may determine a grouping of the set of downlink occasions based on a quantity of the set of slots. In some examples, the grouping component 1140 may determine a quantity of subsets of the set of downlink occasions based on a set of values, in which a respective subset of the quantity of subsets is associated with a respective downlink message of the one or more downlink messages. In some cases, a quantity of slots of the first subset is different than a second quantity of slots of a second subset of the set of downlink occasions.

The control component 1125 may receive control signaling indicating a quantity of bits to include in the codebook, each of the quantity of bits corresponding to a respective downlink occasion of the set of downlink occasions. In some examples, the control signaling includes radio resource control signaling.

The message receiver 1130 may successfully receive the first downlink message based on the monitoring, in which the information bit corresponding to the slot for the first downlink message includes an acknowledgement bit and each of the one or more repetitions of the information bit include the acknowledgement bit. In some examples, failing to successfully receive the first downlink message, in which the information bit corresponding to the slot for the first downlink message includes a negative acknowledgement bit and each of the one or more repetitions of the information bit include the negative acknowledgement bit. In some examples, successfully receiving the first downlink message associated with the first subset of the set of downlink occasions based on the monitoring, in which the information bit for the first downlink message includes an acknowledgement bit. In some examples, failing to successfully receive the first downlink message associated with the first subset of the set of downlink occasions, in which the information bit for the first downlink message includes a negative acknowledgement bit.

The slot component 1135 may determine the quantity of slots of the first downlink message, in which the portion of the codebook includes one or more bits for at least a portion of slots of the quantity of slots based on an indication of at least the portion of slots being included in a monitoring window, each bit for each slot of at least the portion of slots including the information bit or a repetition of the information bit. In some examples, a first bit of the portion of the codebook includes the information bit for a first slot of the quantity of slots, and one or more remaining bits of the portion of the codebook include the respective repetition of the information bit for a respective remaining slot of at least the portion of slots. In some examples, the quantity of slots of the first downlink message includes a first slot for a transmission of the first downlink message using a first redundancy version and a second slot for the transmission of the first downlink message using a second redundancy version.

The value set component 1145 may determine the set of values based on a configuration of the UE, each value of the set of values indicating a quantity of slots between transmitting the codebook and a downlink occasion of the set of downlink occasions.

The window component 1150 may determine a window of slots for monitoring the set of downlink occasions based on the set of values. In some examples, the window component 1150 may divide the window of slots by the quantity of the set of slots, in which determining the quantity of subsets is based on dividing the window of slots.

The subset component 1155 may determine the first subset of the set of downlink occasions based on the grouping, the first subset of the set of downlink occasions corresponding to the first downlink message of the one or more downlink messages, in which generating the codebook is based on determining the first subset of the set of downlink occasions. In some examples, the first subset of the set of downlink occasions includes a multiple slot candidate downlink occasion. In some examples, the first downlink message is partially located within the first subset. In some examples, the first downlink message is fully located within the first subset.

The DCI component 1160 may receive downlink control information indicating at least one downlink message corresponding to a single slot. In some examples, a quantity of downlink messages of at least the one downlink message corresponding to the single slot satisfies a threshold, a last slot of a downlink message corresponding to the set of slots satisfies the threshold, or both.

Figure 12 shows a diagram of a system 1200 including a device 1205 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. The device 1205 may be an example of or include the components of device 905, device 1005, or a UE 115 as described herein. The device 1205 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 1210, an I/O controller 1215, a transceiver 1220, an antenna 1225, memory 1230, and a processor 1240. These components may be in electronic communication via one or more buses (for example, bus 1245) .

The communications manager 1210 may monitor a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a set of slots, generate, based on the monitoring, a codebook including an information bit for each of the one or more downlink messages, in which a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message, and transmit, via an uplink control channel, the codebook to the base station after the set of downlink occasions. The communications manager 1210 may also determine a grouping of the set of downlink occasions based on a quantity of the set of slots, generate a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, in which the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions, and transmit, via an uplink control channel, the codebook to the base station after the set of downlink occasions.

The I/O controller 1215 may manage input and output signals for the device 1205. The I/O controller 1215 may also manage peripherals not integrated into the device 1205. In some examples, the I/O controller 1215 may represent a physical connection or port to an external peripheral. In some examples, the I/O controller 1215 may utilize an operating system such as

or another known operating system. In other examples, the I/O controller 1215 may represent or interact with a modem, a keyboard, a mouse, a touchscreen, or a similar device. In some examples, the I/O controller 1215 may be implemented as part of a processor. In some examples, a user may interact with the device 1205 via the I/O controller 1215 or via hardware components controlled by the I/O controller 1215.

The transceiver 1220 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above. For example, the transceiver 1220 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1220 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.

In some examples, the wireless device may include a single antenna 1225. However, in some examples the device may have more than one antenna 1225, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

The memory 1230 may include random access memory (RAM) and read-only memory (ROM) . The memory 1230 may store computer-readable, computer-executable code 1235 including instructions that, if executed, cause the processor to perform various functions described herein. In some examples, the memory 1230 may contain, among other things, a basic input/output system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The processor 1240 may include an intelligent hardware device, (for example, a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some examples, the processor 1240 may be configured to operate a memory array using a memory controller. In other examples, a memory controller may be integrated into the processor 1240. The processor 1240 may be configured to execute computer-readable instructions stored in a memory (for example, the memory 1230) to cause the device 1205 to perform various functions (for example, functions or tasks supporting techniques for enhanced semi-static codebooks) .

The code 1235 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 1235 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some examples, the code 1235 may not be directly executable by the processor 1240 but may cause a computer (for example, if compiled and executed) to perform functions described herein.

Figure 13 shows a block diagram of a device 1305 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. The device 1305 may be an example of aspects of a base station 105 as described herein. The device 1305 may include a receiver 1310, a communications manager 1315, and a transmitter 1320. The device 1305 can be implemented, at least in part, by one or both of a modem and a processor. Each of these components may be in communication with one another (for example, via one or more buses) .

The receiver 1310 may receive information such as packets, user data, or control information associated with various information channels (for example, control channels, data channels, and information related to techniques for enhanced semi-static codebooks, among other examples) . Information may be passed on to other components of the device 1305. The receiver 1310 may be an example of aspects of the transceiver 1620 described with reference to Figure 16. The receiver 1310 may utilize a single antenna or a set of antennas.

The communications manager 1315 may transmit one or more downlink messages to a UE via a set of downlink occasions, each of the one or more downlink messages corresponding to a set of slots and receive, via an uplink control channel, a codebook from the UE based on transmitting the one or more downlink messages, the codebook including an information bit for each of the one or more downlink messages, in which a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message. The communications manager 1315 may also determine a grouping of the set of downlink occasions based on a quantity of the set of slots and receive, via an uplink control channel, a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, in which the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions. The communications manager 1315 may be an example of aspects of the communications manager 1610 described herein.

The communications manager 1315, or its sub-components, may be implemented in hardware, code (for example, software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communications manager 1315, or its sub-components may be executed by a general-purpose processor, a DSP, an application-specific integrated circuit (ASIC) , a FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.

The transmitter 1320 may transmit signals generated by other components of the device 1305. In some examples, the transmitter 1320 may be collocated with a receiver 1310 in a transceiver component. For example, the transmitter 1320 may be an example of aspects of the transceiver 1620 described with reference to Figure 16. The transmitter 1320 may utilize a single antenna or a set of antennas.

Figure 14 shows a block diagram of a device 1405 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. The device 1405 may be an example of aspects of a device 1305, or a base station 105 as described herein. The device 1405 may include a receiver 1410, a communications manager 1415, and a transmitter 1435. The device 1405 can be implemented, at least in part, by one or both of a modem and a processor. Each of these components may be in communication with one another (for example, via one or more buses) .

The receiver 1410 may receive information such as packets, user data, or control information associated with various information channels (for example, control channels, data channels, and information related to techniques for enhanced semi-static codebooks, among other examples) . Information may be passed on to other components of the device 1405. The receiver 1410 may be an example of aspects of the transceiver 1620 described with reference to Figure 16. The receiver 1410 may utilize a single antenna or a set of antennas.

The communications manager 1415 may be an example of aspects of the communications manager 1315 as described herein. The communications manager 1415 may include a message transmitter 1420, a codebook receiver 1425, and a grouping manager 1430. The communications manager 1415 may be an example of aspects of the communications manager 1610 described herein.

The message transmitter 1420 may transmit one or more downlink messages to a UE via a set of downlink occasions, each of the one or more downlink messages corresponding to a set of slots.

The codebook receiver 1425 may receive, via an uplink control channel, a codebook from the UE based on transmitting the one or more downlink messages, the codebook including an information bit for each of the one or more downlink messages, in which a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message.

The codebook receiver 1425 may receive, via an uplink control channel, a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, in which the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions.

The grouping manager 1430 may determine a grouping of the set of downlink occasions based on a quantity of the set of slots.

The transmitter 1435 may transmit signals generated by other components of the device 1405. In some examples, the transmitter 1435 may be collocated with a receiver 1410 in a transceiver component. For example, the transmitter 1435 may be an example of aspects of the transceiver 1620 described with reference to Figure 16. The transmitter 1435 may utilize a single antenna or a set of antennas.

Figure 15 shows a block diagram of a communications manager 1505 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. The communications manager 1505 may be an example of aspects of a communications manager 1315, a communications manager 1415, or a communications manager 1610 described herein. The communications manager 1505 may include a message transmitter 1510, a codebook receiver 1515, a control manager 1520, an ACK component 1525, a NACK component 1530, a slot manager 1535, a codebook manager 1540, a grouping manager 1545, a value set manager 1550, a window manager 1555, a DCI manager 1560, and a subset manager 1565. Each of these components may communicate, directly or indirectly, with one another (for example, via one or more buses) .

The message transmitter 1510 may transmit one or more downlink messages to a UE via a set of downlink occasions, each of the one or more downlink messages corresponding to a set of slots.

The codebook receiver 1515 may receive, via an uplink control channel, a codebook from the UE based on transmitting the one or more downlink messages, the codebook including an information bit for each of the one or more downlink messages, in which a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message.

In some examples, the codebook receiver 1515 may receive, via an uplink control channel, a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, in which the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions.

In some examples, the codebook receiver 1515 may receive a second codebook for at least the one downlink message corresponding to the single slot. In some examples, the codebook includes a first quantity of bits associated with the first downlink message, a second quantity of bits associated with a second downlink message, a third quantity of bits associated with a third downlink message, or any combination thereof. In some examples, the first quantity of bits is different than the second quantity of bits. In some examples, the one or more downlink messages include one or more physical downlink shared channel messages, the information bit includes a hybrid automatic repeat request feedback bit, or both.

The grouping manager 1545 may determine a grouping of the set of downlink occasions based on a quantity of the set of slots. In some examples, the grouping manager 1545 may determine a quantity of subsets of the set of downlink occasions based on a set of values, in which each subset of the quantity of subsets is associated with a downlink message of the one or more downlink messages. In some examples, a quantity of slots of the first subset is different than a second quantity of slots of a second subset of the set of downlink occasions.

The control manager 1520 may transmit control signaling indicating a quantity of bits to include in the codebook, each of the quantity of bits corresponding to a respective downlink occasion of the set of downlink occasions.

The ACK component 1525 may determine that the UE successfully received the first downlink message based on the information bit corresponding to the slot for the first downlink message including an acknowledgement bit and each of the one or more repetitions of the information bit include the acknowledgement bit. In some examples, the ACK component 1525 may determine that the UE successfully received the first downlink message associated with the first subset of the set of downlink occasions based on the information bit for the first downlink message including an acknowledgement bit.

The NACK component 1530 may determine that the UE failed to successfully receive the first downlink message based on the information bit corresponding to the slot for the first downlink message including a negative acknowledgement bit and each of the one or more repetitions of the information bit include the negative acknowledgement bit. In some examples, the NACK component 1530 may determine that the UE failed to successfully receive the first downlink message associated with the first subset of the set of downlink occasions based on the information bit for the first downlink message including a negative acknowledgement bit.

The slot manager 1535 may determine the quantity of slots of the first downlink message, in which the portion of the codebook includes one or more bits for at least a portion of slots of the quantity of slots based on an indication of at least the portion of slots being included in a monitoring window, each bit for each slot of at least the portion of slots including the information bit or a repetition of the information bit. In some examples, a first bit of the portion of the codebook includes the information bit for a first slot of the quantity of slots, and one or more remaining bits of the portion of the codebook include the respective repetition of the information bit for a respective remaining slot of at least the portion of slots. In some examples, the quantity of slots of the first downlink message includes a first slot for a transmission of the first downlink message using a first redundancy version and a second slot for the transmission of the first downlink message using a second redundancy version.

The codebook manager 1540 may determine a second portion of the codebook including a second information bit corresponding to a second slot for a second downlink message of the one or more downlink messages, in which the second portion of the codebook includes one or more repetitions of the second information bit based on a second quantity of slots of the second downlink message. In some examples, the codebook includes a second information bit corresponding to a second subset of the set of downlink occasions based on the grouping.

The value set manager 1550 may determine the set of values, each value of the set of values indicating a quantity of slots between receiving the codebook and a downlink occasion of the set of downlink occasions.

The window manager 1555 may determine a window of slots that the UE monitors for the set of downlink occasions based on the set of values.

In some examples, the window manager 1555 may divide the window of slots by the quantity of the set of slots, in which determining the quantity of subsets is based on dividing the window of slots.

The DCI manager 1560 may transmit downlink control information indicating at least one downlink message corresponding to a single slot. In some examples, a quantity of downlink messages of at least the one downlink message corresponding to the single slot satisfies a threshold, a last slot of a downlink message corresponding to the set of slots satisfies the threshold, or both.

The subset manager 1565 may determine the first subset of the set of downlink occasions based on the grouping, the first subset of the set of downlink occasions corresponding to the first downlink message of the one or more downlink messages, in which receiving the codebook is based on determining the first subset of the set of downlink occasions. In some examples, the first subset of the set of downlink occasions includes a multiple slot candidate downlink occasion. In some examples, the first downlink message is partially located within the first subset. In some examples, the first downlink message is fully located within the first subset.

Figure 16 shows a diagram of a system 1600 including a device 1605 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. The device 1605 may be an example of or include the components of device 1305, device 1405, or a base station 105 as described herein. The device 1605 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including a communications manager 1610, a network communications manager 1615, a transceiver 1620, an antenna 1625, memory 1630, a processor 1640, and an inter-station communications manager 1645. These components may be in electronic communication via one or more buses (for example, bus 1650) .

The communications manager 1610 may transmit one or more downlink messages to a UE via a set of downlink occasions, each of the one or more downlink messages corresponding to a set of slots and receive, via an uplink control channel, a codebook from the UE based on transmitting the one or more downlink messages, the codebook including an information bit for each of the one or more downlink messages, in which a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message. The communications manager 1610 may also determine a grouping of the set of downlink occasions based on a quantity of the set of slots and receive, via an uplink control channel, a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, in which the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions.

The network communications manager 1615 may manage communications with the core network (for example, via one or more wired backhaul links) . For example, the network communications manager 1615 may manage the transfer of data communications for client devices, such as one or more UEs 115.

The transceiver 1620 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above. For example, the transceiver 1620 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 1620 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.

In some examples, the wireless device may include a single antenna 1625. However, in some examples the device may have more than one antenna 1625, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.

The memory 1630 may include RAM, ROM, or a combination thereof. The memory 1630 may store computer-readable code 1635 including instructions that, if executed by a processor (for example, the processor 1640) cause the device to perform various functions described herein. In some examples, the memory 1630 may contain, among other things, a BIOS which may control basic hardware or software operation such as the interaction with peripheral components or devices.

The processor 1640 may include an intelligent hardware device, (for example, a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some examples, the processor 1640 may be configured to operate a memory array using a memory controller. In some examples, a memory controller may be integrated into processor 1640. The processor 1640 may be configured to execute computer-readable instructions stored in a memory (for example, the memory 1630) to cause the device 1605 to perform various functions (for example, functions or tasks supporting techniques for enhanced semi-static codebooks) .

The inter-station communications manager 1645 may manage communications with other base station 105, and may include a controller or scheduler for controlling communications with UEs 115 in cooperation with other base stations 105. For example, the inter-station communications manager 1645 may coordinate scheduling for transmissions to UEs 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-station communications manager 1645 may provide an X2 interface within an LTE/LTE-A wireless communication network technology to provide communication between base stations 105.

The code 1635 may include instructions to implement aspects of the present disclosure, including instructions to support wireless communications. The code 1635 may be stored in a non-transitory computer-readable medium such as system memory or other type of memory. In some examples, the code 1635 may not be directly executable by the processor 1640 but may cause a computer (for example, if compiled and executed) to perform functions described herein.

Figure 17 shows a flowchart illustrating a method 1700 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. The operations of method 1700 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1700 may be performed by a communications manager as described with reference to Figures 9–12. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1705, the UE may monitor a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a set of slots. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed by a monitoring component as described with reference to Figures 9–12.

At 1710, the UE may generate, based on the monitoring, a codebook including an information bit for each of the one or more downlink messages, in which a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed by a codebook component as described with reference to Figures 9–12.

At 1715, the UE may transmit, via an uplink control channel, the codebook to the base station after the set of downlink occasions. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be performed by a codebook transmitter as described with reference to Figures 9–12.

Figure 18 shows a flowchart illustrating a method 1800 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. The operations of method 1800 may be implemented by a UE 115 or its components as described herein. For example, the operations of method 1800 may be performed by a communications manager as described with reference to Figures 9–12. In some examples, a UE may execute a set of instructions to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, a UE may perform aspects of the functions described below using special-purpose hardware.

At 1805, the UE may monitor a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a set of slots. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be performed by a undefined as described with reference to Figures 9–12.

At 1810, the UE may determine a grouping of the set of downlink occasions based on a quantity of the set of slots. The operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be performed by a grouping component as described with reference to Figures 9–12.

At 1815, the UE may generate a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, in which the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions. The operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be performed by a codebook component as described with reference to Figures 9–12.

At 1820, the UE may transmit, via an uplink control channel, the codebook to the base station after the set of downlink occasions. The operations of 1820 may be performed according to the methods described herein. In some examples, aspects of the operations of 1820 may be performed by a codebook transmitter as described with reference to Figures 9–12.

Figure 19 shows a flowchart illustrating a method 1900 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. The operations of method 1900 may be implemented by a base station 105 or its components as described herein. For example, the operations of method 1900 may be performed by a communications manager as described with reference to Figures 13–16. In some examples, a base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, a base station may perform aspects of the functions described below using special-purpose hardware.

At 1905, the base station may transmit one or more downlink messages to a UE via a set of downlink occasions, each of the one or more downlink messages corresponding to a set of slots. The operations of 1905 may be performed according to the methods described herein. In some examples, aspects of the operations of 1905 may be performed by a message transmitter as described with reference to Figures 13–16.

At 1910, the base station may receive, via an uplink control channel, a codebook from the UE based on transmitting the one or more downlink messages, the codebook including an information bit for each of the one or more downlink messages, in which a portion of the codebook includes an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook includes one or more repetitions of the information bit based on a quantity of slots of the first downlink message. The operations of 1910 may be performed according to the methods described herein. In some examples, aspects of the operations of 1910 may be performed by a codebook receiver as described with reference to Figures 13–16.

Figure 20 shows a flowchart illustrating a method 2000 that supports techniques for enhanced semi-static codebooks in accordance with aspects of the present disclosure. The operations of method 2000 may be implemented by a base station 105 or its components as described herein. For example, the operations of method 2000 may be performed by a communications manager as described with reference to Figures 13–16. In some examples, a base station may execute a set of instructions to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, a base station may perform aspects of the functions described below using special-purpose hardware.

At 2005, the base station may transmit one or more downlink messages to a UE via a set of downlink occasions, each of the one or more downlink messages corresponding to a set of slots. The operations of 2005 may be performed according to the methods described herein. In some examples, aspects of the operations of 2005 may be performed by a undefined as described with reference to Figures 13–16.

At 2010, the base station may determine a grouping of the set of downlink occasions based on a quantity of the set of slots. The operations of 2010 may be performed according to the methods described herein. In some examples, aspects of the operations of 2010 may be performed by a grouping manager as described with reference to Figures 13–16.

At 2015, the base station may receive, via an uplink control channel, a codebook including an information bit for each of the one or more downlink messages based on the monitoring and the grouping, in which the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions. The operations of 2015 may be performed according to the methods described herein. In some examples, aspects of the operations of 2015 may be performed by a codebook receiver as described with reference to Figures 13–16.

It should be noted that the methods described herein describe possible implementations, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods may be combined.

Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for purposes of example, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communications systems such as Ultra Mobile Broadband (UMB) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, as well as other systems and radio technologies not explicitly mentioned herein.

Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (for example, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) .

The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at different locations, including being distributed such that portions of functions are implemented at different physical locations.

Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of computer-readable medium. Disk and disc, as used herein, include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc in which disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

As used herein, including in the claims, “or” as used in a list of items (for example, a list of items prefaced by a phrase such as “at least one of” or “one or more of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (in other words, A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ”

In the appended figures, similar components or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a dash and a second label that distinguishes among the similar components. If just the first reference label is used in the specification, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label, or other subsequent reference label.

The description set forth herein, in connection with the appended drawings, describes example configurations and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration, ” and not “preferred” or “advantageous over other examples. ” The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein, but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

A method for wireless communications at a user equipment (UE) , comprising:

monitoring a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a plurality of slots;

generating, based at least in part on the monitoring, a codebook comprising an information bit for each of the one or more downlink messages, wherein a portion of the codebook comprises an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook comprises one or more repetitions of the information bit based at least in part on a quantity of slots of the first downlink message; and

transmitting, via an uplink control channel, the codebook to the base station after the set of downlink occasions.
The method of claim 1, wherein the codebook comprises a first quantity of bits associated with the first downlink message and a second quantity of bits associated with a second downlink message, wherein the first quantity of bits is different than the second quantity of bits.
The method of any one of claims 1–2, further comprising receiving control signaling indicating a quantity of bits to include in the codebook, each of the quantity of bits corresponding to a respective downlink occasion of the set of downlink occasions.
The method of claim 3, wherein the control signaling comprises radio resource control signaling.
The method of any one of claims 1–4, further comprising successfully receiving the first downlink message based at least in part on the monitoring, wherein the information bit corresponding to the slot for the first downlink message comprises an acknowledgement bit and each of the one or more repetitions of the information bit comprise the acknowledgement bit.
The method of any one of claims 1–4, further comprising failing to successfully receive the first downlink message, wherein the information bit corresponding to the slot for the first downlink message comprises a negative acknowledgement bit and each of the one or more repetitions of the information bit comprise the negative acknowledgement bit.
The method of any one of claims 1–6, further comprising determining the quantity of slots of the first downlink message, wherein the portion of the codebook comprises one or more bits for at least a portion of slots of the quantity of slots based at least in part on an indication of at least the portion of slots being included in a monitoring window, each bit for each slot of at least the portion of slots comprising the information bit or a repetition of the information bit.
The method of claim 7, wherein a first bit of the portion of the codebook comprises the information bit for a first slot of the quantity of slots, and one or more remaining bits of the portion of the codebook comprise the respective repetition of the information bit for a respective remaining slot of at least the portion of slots.
The method of any one of claims 1–8, wherein the quantity of slots of the first downlink message comprises a first slot for a transmission of the first downlink message using a first redundancy version and a second slot for the transmission of the first downlink message using a second redundancy version.
The method of any one of claims 1–9, wherein generating the codebook further comprises determining a second portion of the codebook comprising a second information bit corresponding to a second slot for a second downlink message of the one or more downlink messages, wherein the second portion of the codebook comprises one or more repetitions of the second information bit based at least in part on a second quantity of slots of the second downlink message.
The method of any one of claims 1–10, wherein the one or more downlink messages comprise one or more physical downlink shared channel messages, the information bit comprises a hybrid automatic repeat request feedback bit, or both.
A method for wireless communications at a user equipment (UE) , comprising:

monitoring a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a plurality of slots;

determining a grouping of the set of downlink occasions based at least in part on a quantity of the plurality of slots;

generating a codebook comprising an information bit for each of the one or more downlink messages based at least in part on the monitoring and the grouping, wherein the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions; and

transmitting, via an uplink control channel, the codebook to the base station after the set of downlink occasions.
The method of claim 12, wherein determining the grouping of the set of downlink occasions comprises determining a quantity of subsets of the set of downlink occasions based at least in part on a set of values, wherein a respective subset of the quantity of subsets is associated with a respective downlink message of the one or more downlink messages.
The method of claim 13, further comprising determining the set of values based at least in part on a configuration of the UE, each value of the set of values indicating a quantity of slots between transmitting the codebook and a downlink occasion of the set of downlink occasions.
The method of claim 13, further comprising:

determining a window of slots for monitoring the set of downlink occasions based at least in part on the set of values; and

dividing the window of slots by the quantity of the plurality of slots, wherein determining the quantity of subsets is based at least in part on dividing the window of slots.
The method of claim 13, wherein a quantity of slots of the first subset is different than a second quantity of slots of a second subset of the set of downlink occasions.
The method of any one of claims 12–16, further comprising determining the first subset of the set of downlink occasions based at least in part on the grouping, the first subset of the set of downlink occasions corresponding to the first downlink message of the one or more downlink messages, wherein generating the codebook is based at least in part on determining the first subset of the set of downlink occasions.
The method of claim 17, wherein the first subset of the set of downlink occasions comprises a multiple slot candidate downlink occasion.
The method of claim 17, wherein the first downlink message is partially located within the first subset.
The method of claim 17, wherein the first downlink message is fully located within the first subset.
The method of any one of claims 12–20, further comprising receiving downlink control information indicating at least one downlink message corresponding to a single slot.
The method of claim 21, wherein a quantity of downlink messages of at least the one downlink message corresponding to the single slot satisfies a threshold, a last slot of a downlink message corresponding to the plurality of slots satisfies the threshold, or both.
The method of claim 21, further comprising:

generating a second codebook for at least the one downlink message corresponding to the single slot; and

transmitting the second codebook to the base station.
The method of any one of claims 12–23, further comprising successfully receiving the first downlink message associated with the first subset of the set of downlink occasions based at least in part on the monitoring, wherein the information bit for the first downlink message comprises an acknowledgement bit.
The method of any one of claims 12–23, further comprising failing to successfully receive the first downlink message associated with the first subset of the set of downlink occasions, wherein the information bit for the first downlink message comprises a negative acknowledgement bit.
The method of any one of claims 12–25, wherein the codebook comprises a second information bit corresponding to a second subset of the set of downlink occasions based at least in part on the grouping.
The method of any one of claims 12–26, wherein a quantity of slots of the first downlink message comprises a first slot for a transmission of the first downlink message using a first redundancy version and a second slot for the transmission of the first downlink message using a second redundancy version.
The method of any one of claims 12–27, wherein the one or more downlink messages comprise one or more physical downlink shared channel messages, the information bit comprises a hybrid automatic repeat request feedback bit, or both.
A method for wireless communications at a base station, comprising:

transmitting one or more downlink messages to a user equipment (UE) via a set of downlink occasions, each of the one or more downlink messages corresponding to a plurality of slots; and

receiving, via an uplink control channel, a codebook from the UE based at least in part on transmitting the one or more downlink messages, the codebook comprising an information bit for each of the one or more downlink messages, wherein a portion of the codebook comprises an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook comprises one or more repetitions of the information bit based at least in part on a quantity of slots of the first downlink message.
The method of claim 29, wherein the codebook comprises a first quantity of bits associated with the first downlink message, a second quantity of bits associated with a second downlink message, a third quantity of bits associated with a third downlink message, or any combination thereof.
The method of claim 30, wherein the first quantity of bits is different than the second quantity of bits.
The method of any one of claims 29–31, further comprising transmitting control signaling indicating a quantity of bits to include in the codebook, each of the quantity of bits corresponding to a respective downlink occasion of the set of downlink occasions.
The method of claim 32, wherein the control signaling comprises radio resource control signaling.
The method of any one of claims 29–33, further comprising determining that the UE successfully received the first downlink message based at least in part on the information bit corresponding to the slot for the first downlink message comprising an acknowledgement bit and each of the one or more repetitions of the information bit comprise the acknowledgement bit.
The method of any one of claims 29–33, further comprising determining that the UE failed to successfully receive the first downlink message based at least in part on the information bit corresponding to the slot for the first downlink message comprising a negative acknowledgement bit and each of the one or more repetitions of the information bit comprise the negative acknowledgement bit.
The method of any one of claims 29–35, further comprising determining the quantity of slots of the first downlink message, wherein the portion of the codebook comprises one or more bits for at least a portion of slots of the quantity of slots based at least in part on an indication of at least the portion of slots being included in a monitoring window, each bit for each slot of at least the portion of slots comprising the information bit or a repetition of the information bit.
The method of claim 36, wherein a first bit of the portion of the codebook comprises the information bit for a first slot of the quantity of slots, and one or more remaining bits of the portion of the codebook comprise the respective repetition of the information bit for a respective remaining slot of at least the portion of slots.
The method of any one of claims 29–37, wherein the quantity of slots of the first downlink message comprises a first slot for a transmission of the first downlink message using a first redundancy version and a second slot for the transmission of the first downlink message using a second redundancy version.
The method of any one of claims 29–38, further comprising determining a second portion of the codebook comprising a second information bit corresponding to a second slot for a second downlink message of the one or more downlink messages, wherein the second portion of the codebook comprises one or more repetitions of the second information bit based at least in part on a second quantity of slots of the second downlink message.
The method of any one of claims 29–39, wherein the one or more downlink messages comprise one or more physical downlink shared channel messages, the information bit comprises a hybrid automatic repeat request feedback bit, or both.
A method for wireless communications at a base station, comprising:

transmitting one or more downlink messages to a user equipment (UE) via a set of downlink occasions, each of the one or more downlink messages corresponding to a plurality of slots;

determining a grouping of the set of downlink occasions based at least in part on a quantity of the plurality of slots; and

receiving, via an uplink control channel, a codebook comprising an information bit for each of the one or more downlink messages based at least in part on the monitoring and the grouping, wherein the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions.
The method of claim 41, wherein determining the grouping of the set of downlink occasions comprises determining a quantity of subsets of the set of downlink occasions based at least in part on a set of values, wherein each subset of the quantity of subsets is associated with a downlink message of the one or more downlink messages.
The method of claim 42, further comprising determining the set of values, each value of the set of values indicating a quantity of slots between receiving the codebook and a downlink occasion of the set of downlink occasions.
The method of claim 42, further comprising:

determining a window of slots that the UE monitors for the set of downlink occasions based at least in part on the set of values; and

dividing the window of slots by the quantity of the plurality of slots, wherein determining the quantity of subsets is based at least in part on dividing the window of slots.
The method of claim 42, wherein a quantity of slots of the first subset is different than a second quantity of slots of a second subset of the set of downlink occasions.
The method of claim 42, further comprising determining that the UE successfully received the first downlink message associated with the first subset of the set of downlink occasions based at least in part on the information bit for the first downlink message comprising an acknowledgement bit.
The method of claim 42, further comprising determining that the UE failed to successfully receive the first downlink message associated with the first subset of the set of downlink occasions based at least in part on the information bit for the first downlink message comprising a negative acknowledgement bit.
The method of claim 42, wherein the codebook comprises a second information bit corresponding to a second subset of the set of downlink occasions based at least in part on the grouping.
The method of claim 42, wherein a quantity of slots of the first downlink message a first slot for a transmission of the first downlink message using a first redundancy version and a second slot for the transmission of the first downlink message using a second redundancy version.
The method of any one of claims 41–49, further comprising transmitting downlink control information indicating at least one downlink message corresponding to a single slot.
The method of claim 50, wherein a quantity of downlink messages of at least the one downlink message corresponding to the single slot satisfies a threshold, a last slot of a downlink message corresponding to the plurality of slots satisfies the threshold, or both.
The method of claim 50, further comprising receiving a second codebook for at least the one downlink message corresponding to the single slot.
The method of any one of claims 41–52, further comprising determining the first subset of the set of downlink occasions based at least in part on the grouping, the first subset of the set of downlink occasions corresponding to the first downlink message of the one or more downlink messages, wherein receiving the codebook is based at least in part on determining the first subset of the set of downlink occasions.
The method of any one of claims 41–53, wherein the first subset of the set of downlink occasions comprises a multiple slot candidate downlink occasion.
The method of claim 53, wherein the first downlink message is partially located within the first subset.
The method of claim 53, wherein the first downlink message is fully located within the first subset.
The method of any one of claims 41–56, wherein the one or more downlink messages comprise one or more physical downlink shared channel messages, the information bit comprises a hybrid automatic repeat request feedback bit, or both.
An apparatus for wireless communications at a user equipment (UE) , comprising:

a processor,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

monitor a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a plurality of slots;

generate, based at least in part on the monitoring, a codebook comprising an information bit for each of the one or more downlink messages, wherein a portion of the codebook comprises an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook comprises one or more repetitions of the information bit based at least in part on a quantity of slots of the first downlink message; and

transmit, via an uplink control channel, the codebook to the base station after the set of downlink occasions.
The apparatus of claim 58, wherein the codebook comprises a first quantity of bits associated with the first downlink message and a second quantity of bits associated with a second downlink message, wherein the first quantity of bits is different than the second quantity of bits.
The apparatus of any one of claims 58–59, further comprising receiving control signaling indicating a quantity of bits to include in the codebook, each of the quantity of bits corresponding to a respective downlink occasion of the set of downlink occasions.
The apparatus of claim 60, wherein the control signaling comprises radio resource control signaling.
The apparatus of any one of claims 58–61, wherein the information bit corresponding to the slot for the first downlink message comprises an acknowledgement bit and each of the one or more repetitions of the information bit comprise the acknowledgement bit.
The apparatus of any one of claims 58–62, wherein the information bit corresponding to the slot for the first downlink message comprises a negative acknowledgement bit and each of the one or more repetitions of the information bit comprise the negative acknowledgement bit.
The apparatus of any one of claims 58–63, wherein the portion of the codebook comprises one or more bits for at least a portion of slots of the quantity of slots based at least in part on an indication of at least the portion of slots being included in a monitoring window, each bit for each slot of at least the portion of slots comprising the information bit or a repetition of the information bit.
The apparatus of claim 64, wherein a first bit of the portion of the codebook comprises the information bit for a first slot of the quantity of slots, and one or more remaining bits of the portion of the codebook comprise the respective repetition of the information bit for a respective remaining slot of at least the portion of slots.
The apparatus of any one of claims 58–65, wherein the quantity of slots of the first downlink message comprises a first slot for a transmission of the first downlink message using a first redundancy version and a second slot for the transmission of the first downlink message using a second redundancy version.
The apparatus of any one of claims 58–66, wherein the instructions to generate the codebook further are executable by the processor to cause the apparatus to determine a second portion of the codebook comprising a second information bit corresponding to a second slot for a second downlink message of the one or more downlink messages, wherein the second portion of the codebook.
The apparatus of any one of claims 58–67, wherein the one or more downlink messages comprise one or more physical downlink shared channel messages, the information bit comprises a hybrid automatic repeat request feedback bit, or both.
An apparatus for wireless communications at a user equipment (UE) , comprising:

a processor,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

monitor a set of downlink occasions for one or more downlink messages from a base station, each of the one or more downlink messages corresponding to a plurality of slots;

determine a grouping of the set of downlink occasions based at least in part on a quantity of the plurality of slots;

generate a codebook comprising an information bit for each of the one or more downlink messages based at least in part on the monitoring and the grouping, wherein the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions; and

transmit, via an uplink control channel, the codebook to the base station after the set of downlink occasions.
The apparatus of claim 69, wherein the instructions to determine the grouping of the set of downlink occasions are executable by the processor to cause the apparatus to determine a quantity of subsets of the set of downlink occasions based at least in part on a set of values, wherein a respective subset of the quantity of subsets is associated with a respective downlink message of the one or more downlink messages.
The apparatus of claim 70, further comprising determining the set of values based at least in part on a configuration of the UE, each value of the set of values indicating a quantity of slots between transmitting the codebook and a downlink occasion of the set of downlink occasions.
The apparatus of claim 70, wherein the instructions are further executable by the processor to cause the apparatus to:

determine a window of slots for monitoring the set of downlink occasions based at least in part on the set of values; and

divide the window of slots by the quantity of the plurality of slots, wherein determining the quantity of subsets is based at least in part on dividing the window of slots.
The apparatus of claim 70, wherein a quantity of slots of the first subset is different than a second quantity of slots of a second subset of the set of downlink occasions.
The apparatus of any one of claims 69–73, further comprising determining the first subset of the set of downlink occasions based at least in part on the grouping, the first subset of the set of downlink occasions corresponding to the first downlink message of the one or more downlink messages, wherein generating the codebook is based at least in part on determining the first subset of the set of downlink occasions.
The apparatus of claim 74, wherein the first subset of the set of downlink occasions comprises a multiple slot candidate downlink occasion.
The apparatus of claim 74, wherein the first downlink message is partially located within the first subset.
The apparatus of claim 74, wherein the first downlink message is fully located within the first subset.
The apparatus of any one of claims 69–77, further comprising receiving downlink control information indicating at least one downlink message corresponding to a single slot.
The apparatus of claim 78, wherein a quantity of downlink messages of at least the one downlink message corresponding to the single slot satisfies a threshold, a last slot of a downlink message corresponding to the plurality of slots satisfies the threshold, or both.
The apparatus of claim 78, wherein the instructions are further executable by the processor to cause the apparatus to:

generate a second codebook for at least the one downlink message corresponding to the single slot; and

transmit the second codebook to the base station.
The apparatus of any one of claims 69–80, wherein the information bit for the first downlink message comprises an acknowledgement bit.
The apparatus of any one of claims 69–80, wherein the information bit for the first downlink message comprises a negative acknowledgement bit.
The apparatus of any one of claims 69–82, wherein the codebook comprises a second information bit corresponding to a second subset of the set of downlink occasions based at least in part on the grouping.
The apparatus of any one of claims 69–83, wherein a quantity of slots of the first downlink message comprises a first slot for a transmission of the first downlink message using a first redundancy version and a second slot for the transmission of the first downlink message using a second redundancy version.
The apparatus of any one of claims 69–84, wherein the one or more downlink messages comprise one or more physical downlink shared channel messages, the information bit comprises a hybrid automatic repeat request feedback bit, or both.
An apparatus for wireless communications at a base station, comprising:

a processor,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

transmit one or more downlink messages to a user equipment (UE) via a set of downlink occasions, each of the one or more downlink messages corresponding to a plurality of slots; and

receive, via an uplink control channel, a codebook from the UE based at least in part on transmitting the one or more downlink messages, the codebook comprising an information bit for each of the one or more downlink messages, wherein a portion of the codebook comprises an information bit corresponding to a slot for a first downlink message of the one or more downlink messages and the portion of the codebook comprises one or more repetitions of the information bit based at least in part on a quantity of slots of the first downlink message.
The apparatus of claim 86, wherein the codebook comprises a first quantity of bits associated with the first downlink message, a second quantity of bits associated with a second downlink message, a third quantity of bits associated with a third downlink message, or any combination thereof.
The apparatus of claim 87, wherein the first quantity of bits is different than the second quantity of bits.
The apparatus of any one of claims 86–88, further comprising transmitting control signaling indicating a quantity of bits to include in the codebook, each of the quantity of bits corresponding to a respective downlink occasion of the set of downlink occasions.
The apparatus of claim 89, wherein the control signaling comprises radio resource control signaling.
The apparatus of any one of claims 86–90, further comprising determining that the UE successfully received the first downlink message based at least in part on the information bit corresponding to the slot for the first downlink message comprising an acknowledgement bit and each of the one or more repetitions of the information bit comprise the acknowledgement bit.
The apparatus of any one of claims 86–90, further comprising determining that the UE failed to successfully receive the first downlink message based at least in part on the information bit corresponding to the slot for the first downlink message comprising a negative acknowledgement bit and each of the one or more repetitions of the information bit comprise the negative acknowledgement bit.
The apparatus of any one of claims 86–92, wherein the portion of the codebook comprises one or more bits for at least a portion of slots of the quantity of slots based at least in part on an indication of at least the portion of slots being included in a monitoring window, each bit for each slot of at least the portion of slots comprising the information bit or a repetition of the information bit.
The apparatus of any one of claims 86–93, wherein a first bit of the portion of the codebook comprises the information bit for a first slot of the quantity of slots, and one or more remaining bits of the portion of the codebook comprise the respective repetition of the information bit for a respective remaining slot of at least the portion of slots.
The apparatus of any one of claims 86–94, wherein the quantity of slots of the first downlink message comprises a first slot for a transmission of the first downlink message using a first redundancy version and a second slot for the transmission of the first downlink message using a second redundancy version.
The apparatus of any one of claims 86–95, wherein the second portion of the codebook comprises one or more repetitions of the second information bit based at least in part on a second quantity of slots of the second downlink message.
The apparatus of any one of claims 86–96, wherein the one or more downlink messages comprise one or more physical downlink shared channel messages, the information bit comprises a hybrid automatic repeat request feedback bit, or both.
An apparatus for wireless communications at a base station, comprising:

a processor,

memory coupled with the processor; and

instructions stored in the memory and executable by the processor to cause the apparatus to:

transmit one or more downlink messages to a user equipment (UE) via a set of downlink occasions, each of the one or more downlink messages corresponding to a plurality of slots;

determine a grouping of the set of downlink occasions based at least in part on a quantity of the plurality of slots; and

receive, via an uplink control channel, a codebook comprising an information bit for each of the one or more downlink messages based at least in part on the monitoring and the grouping, wherein the information bit for a first downlink message of the one or more downlink messages corresponds to a first subset of the set of downlink occasions.
The apparatus of claim 98, wherein the instructions to determine the grouping of the set of downlink occasions are executable by the processor to cause the apparatus to determine a quantity of subsets of the set of downlink occasions based at least in part on a set of values, wherein each subset of the quantity of subsets is associated with a downlink message of the one or more downlink messages.
The apparatus of claim 99, further comprising determining the set of values, each value of the set of values indicating a quantity of slots between receiving the codebook and a downlink occasion of the set of downlink occasions.
The apparatus of claim 99, wherein the instructions are further executable by the processor to cause the apparatus to:

determine a window of slots that the UE monitors for the set of downlink occasions based at least in part on the set of values; and

divide the window of slots by the quantity of the plurality of slots, wherein determining the quantity of subsets is based at least in part on dividing the window of slots.
The apparatus of claim 99, wherein a quantity of slots of the first subset is different than a second quantity of slots of a second subset of the set of downlink occasions.
The apparatus of claim 99, further comprising determining that the UE successfully received the first downlink message associated with the first subset of the set of downlink occasions based at least in part on the information bit for the first downlink message comprising an acknowledgement bit.
The apparatus of claim 99, further comprising determining that the UE failed to successfully receive the first downlink message associated with the first subset of the set of downlink occasions based at least in part on the information bit for the first downlink message comprising a negative acknowledgement bit.
The apparatus of claim 99, wherein the codebook comprises a second information bit corresponding to a second subset of the set of downlink occasions based at least in part on the grouping.
The apparatus of claim 99, wherein a quantity of slots of the first downlink message a first slot for a transmission of the first downlink message using a first redundancy version and a second slot for the transmission of the first downlink message using a second redundancy version.
The apparatus of any one of claims 98–106, further comprising transmitting downlink control information indicating at least one downlink message corresponding to a single slot.
The apparatus of claim 107, wherein a quantity of downlink messages of at least the one downlink message corresponding to the single slot satisfies a threshold, a last slot of a downlink message corresponding to the plurality of slots satisfies the threshold, or both.
The apparatus of claim 107, further comprising receiving a second codebook for at least the one downlink message corresponding to the single slot.
The apparatus of any one of claims 98–109, further comprising determining the first subset of the set of downlink occasions based at least in part on the grouping, the first subset of the set of downlink occasions corresponding to the first downlink message of the one or more downlink messages, wherein receiving the codebook is based at least in part on determining the first subset of the set of downlink occasions.
The apparatus of claim 110, wherein the first downlink message is partially located within the first subset.
The apparatus of claim 110, wherein the first downlink message is fully located within the first subset.
The apparatus of any one of claims 98–112, wherein the first subset of the set of downlink occasions comprises a multiple slot candidate downlink occasion.
The apparatus of any one of claims 98–113, wherein the one or more downlink messages comprise one or more physical downlink shared channel messages, the information bit comprises a hybrid automatic repeat request feedback bit, or both.