CN116112131A - PRACH repeated transmission method, terminal and network side equipment - Google Patents

Abstract

The present application discloses a PRACH repeated transmission method, a terminal, and network-side equipment, which belong to the field of communication technology. The PRACH repeated transmission method in the embodiment of the present application includes: the terminal receives the physical downlink control channel PDCCH; Physical random access channel PRACH repeated transmission; wherein, the PDCCH includes at least one of the following: first indication information for instructing the terminal to perform PRACH repeated transmission; second indication for determining random access transmission opportunity RO resources Information; wherein, the random access transmission opportunity RO resource is used for the repeated transmission of the PRACH.

Description

PRACH repeated transmission method, terminal and network side equipment

Technical Field

The present application belongs to the field of communication technology, and specifically relates to a PRACH repeated transmission method, a terminal and a network side device.

Background Art

In the method of physical random-access channel (PRACH) transmission, PRACH repeated transmission is a method for improving PRACH coverage. In the case of supporting PRACH repetition, how to implement PRACH repeated transmission needs to be solved.

Summary of the invention

The embodiments of the present application provide a PRACH repeated transmission method, a terminal, and a network-side device, which can solve the problem of how to implement PRACH repeated transmission.

In a first aspect, a PRACH repeated transmission method is provided, which is applied to a terminal, and the method includes:

The terminal receives a physical downlink control channel PDCCH;

The terminal performs repeated transmission of a physical random access channel PRACH according to the PDCCH;

The PDCCH includes at least one of the following:

First indication information used to instruct the terminal to perform PRACH repeated transmission;

Second indication information used to determine random access transmission opportunity RO resources;

The random access transmission opportunity RO resource is used for repeated transmission of the PRACH.

In a second aspect, a PRACH repeated transmission method is provided, which is applied to a network side device, and the method includes:

The network side device sends the physical downlink control channel PDCCH to the terminal;

The PDCCH includes at least one of the following:

First indication information used to instruct the terminal to perform PRACH repeated transmission;

Second indication information used to determine random access transmission opportunity RO resources;

The random access transmission opportunity RO resource is used for repeated transmission of the PRACH.

In a third aspect, a PRACH repeated transmission device is provided, the device comprising:

A first receiving unit, configured to receive a physical downlink control channel PDCCH;

A first processing unit, configured to perform repeated transmission of a physical random access channel PRACH according to the PDCCH;

The PDCCH includes at least one of the following:

First indication information used to instruct the terminal to perform PRACH repeated transmission;

Second indication information used to determine random access transmission opportunity RO resources;

The random access transmission opportunity RO resource is used for repeated transmission of the PRACH.

In a fourth aspect, a PRACH repeated transmission device is provided, the device comprising:

A first sending unit, configured to send a physical downlink control channel PDCCH to a terminal;

The PDCCH includes at least one of the following:

First indication information used to instruct the terminal to perform PRACH repeated transmission;

Second indication information used to determine random access transmission opportunity RO resources;

The random access transmission opportunity RO resource is used for repeated transmission of the PRACH.

In a fifth aspect, a terminal is provided, which includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the PRACH repeated transmission method as described in the first aspect.

In the sixth aspect, a terminal is provided, comprising a processor and a communication interface, wherein the communication interface is used to receive a physical downlink control channel PDCCH, and the processor is used to perform repeated transmission of a physical random access channel PRACH according to the PDCCH; wherein the PDCCH includes at least one of the following: first indication information for instructing the terminal to perform repeated transmission of PRACH; second indication information for determining random access transmission opportunity RO resources; wherein the random access transmission opportunity RO resources are used for the repeated transmission of PRACH.

In the seventh aspect, a network side device is provided, which includes a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein the program or instruction, when executed by the processor, implements the steps of the PRACH repeated transmission method as described in the second aspect.

In the eighth aspect, a network side device is provided, comprising a processor and a communication interface, wherein the communication interface is used to send a physical downlink control channel PDCCH to a terminal; wherein the PDCCH includes at least one of the following: first indication information for instructing the terminal to perform PRACH repeated transmission; second indication information for determining random access transmission opportunity RO resources; wherein the random access transmission opportunity RO resources are used for the PRACH repeated transmission.

In the ninth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the PRACH repeated transmission method as described in the first aspect are implemented, or the steps of the PRACH repeated transmission method as described in the second aspect are implemented.

In the tenth aspect, a chip is provided, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the PRACH repeated transmission method as described in the first aspect, or to implement the PRACH repeated transmission method as described in the second aspect.

In the eleventh aspect, a computer program/program product is provided, wherein the computer program/program product is stored in a non-volatile storage medium, and the program/program product is executed by at least one processor to implement the steps of the PRACH repeated transmission method as described in the first aspect, or to implement the PRACH repeated transmission method as described in the second aspect.

In an embodiment of the present application, information on PRACH repetition transmission is determined based on the received PDCCH, and PRACH repetition transmission is performed, so that PRACH repetition transmission can be triggered by PDCCH, thereby optimizing the random access process.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a structural diagram of a wireless communication system to which an embodiment of the present application can be applied;

FIG2 is a schematic diagram of the association relationship between RO and SSB;

FIG3 is a second schematic diagram of the association relationship between RO and SSB;

FIG4 is a schematic diagram of one of the flow charts of the PRACH repeated transmission method provided in an embodiment of the present application;

FIG5 is a second flow chart of a PRACH repeated transmission method provided in an embodiment of the present application;

FIG6 is a schematic diagram of a structure of a PRACH repeated transmission device according to an embodiment of the present application;

FIG7 is a second structural diagram of a PRACH repeated transmission device provided in an embodiment of the present application;

FIG8 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

FIG9 is a schematic diagram of the hardware structure of a terminal implementing an embodiment of the present application;

FIG10 is a schematic diagram of the structure of a network side device provided in an embodiment of the present application.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first" and "second" are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and/or" in the specification and claims represents at least one of the connected objects, and the character "/" generally represents that the objects associated with each other are in an "or" relationship.

It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE)/LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency Division Multiple Access (SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the above-mentioned systems and radio technologies as well as other systems and radio technologies. The following description describes a new radio (NR) system for example purposes, and NR terms are used in most of the following descriptions, but these technologies can also be applied to applications other than NR system applications, such as the ^6th Generation (6G) communication system.

Fig. 1 shows a structural diagram of a wireless communication system applicable to the embodiment of the present application. The wireless communication system includes a terminal 11 and a network side device 12. Among them, the terminal 11 can also be called a terminal device or a user terminal (User Equipment, UE), and the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a handheld computer, a netbook, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a mobile Internet device (Mobile Internet Device, MID), augmented reality (augmented reality, AR)/virtual reality (virtual reality, VR) equipment, a robot, a wearable device (Wearable Device), a vehicle-mounted device (VUE), a pedestrian terminal (PUE), a smart home (home equipment with wireless communication function, such as a refrigerator, a TV, a washing machine or furniture, etc.) and other terminal side devices, and the wearable device includes: a smart watch, a smart bracelet, a smart headset, a smart glasses, smart jewelry (smart bracelet, smart bracelet, smart ring, smart necklace, smart anklet, smart anklet, etc.), a smart wristband, a smart clothing, a game console, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 can be a base station or a core network, wherein the base station can be referred to as a node B, an evolved node B, an access point, a base transceiver station (Base Transceiver Station, BTS), a radio base station, a radio transceiver, a basic service set (Basic Service Set, BSS), an extended service set (Extended Service Set, ESS), a B node, an evolved B node (eNB), a home B node, a home evolved B node, a WLAN access point, a WiFi node, a transmitting and receiving point (Transmitting Receiving Point, TRP) or some other suitable term in the field. As long as the same technical effect is achieved, the base station is not limited to a specific technical vocabulary. It should be noted that in the embodiment of the present application, only the base station in the NR system is taken as an example, but the specific type of the base station is not limited.

The PRACH repeated transmission method provided in the embodiment of the present application is described in detail below through some embodiments and their application scenarios in combination with the accompanying drawings.

In the prior art, there are contention-based random access procedures and non-contention-based random access procedures.

In the contention random access process, also known as 4-step RACH, the UE first sends msg1 to the network side device, including the preamble; after the network detects the preamble, it will send msg2, including the random access response (RAR) message corresponding to the preamble; after the UE receives msg2, it sends msg3 according to the instruction of RAR; after the network receives msg3, it will send msg4, including the contention resolution ID; when the UE receives msg4, the 4-step random access is completed.

The network includes uplink (UL) grant information in the RAR to indicate the MSG3 physical uplink shared channel (PUSCH) scheduling information, and includes random access preamble ID (RACH preamble ID, RAPID), temporary cell radio network temporary identifier (Temporary Cell Radio Network Temporary Identifier, TC-RNTI), timing advance (Timing Advance, TA) and other information. If the network does not receive the MSG3 PUSCH, it can schedule the retransmission of the MSG3 PUSCH in the TC-RNTI scrambled physical downlink control channel (PDCCH).

For the competitive random access process, different UEs randomly select preambles for transmission, so different UEs may select the same preamble to send on the same resources, triggering the competitive random access process. This situation can be understood as a UE preamble conflict. In this case, different UEs will receive the same RAR, and at this time different UEs will transmit MSG3 PUSCH according to the scheduling information in the RAR UL grant. The network will include the contention resolution ID in the MSG4 Physical Downlink Shared Channel (PDSCH) and the Common Control Channel (CCCH) Service Data Unit (SDU) sent by the UE in the MSG3 PUSCH. If the match is matched, the UE considers that the contention resolution is successful and uses the TC-RNTI as the UE's Cell Radio Network Temporary Identity (C-RNTI). If there is a mismatch, the contention resolution is considered unsuccessful.

If the contention resolution is unsuccessful, the RACH transmission resource is reselected, the PRACH is transmitted, and the next random access attempt is made.

In NR, the base station can configure multiple frequency division multiplexing (FDM) PRACH transmission occasions (Physical Random Access Channel Transmission Opportunities, or PRACH occasions) at a time domain position for transmitting PRACH. For simplicity, this application abbreviates them as ROs. The number of ROs that can perform FDM at a time instance can be: {1, 2, 4, 8}.

The random access preamble (RACH preamble) can only be transmitted on the time domain resources configured by the parameter PRACHConfigurationIndex. The random access preamble can only be transmitted on the frequency domain resources configured by the parameter prach-FDM. The PRACH frequency domain resources n _RA ∈ {0, 1, ..., M-1}, where M is equal to the high-level parameter prach-FDM. At the time of initial access, the PRACH frequency domain resources n _RA are numbered in ascending order from the lowest frequency RO resource in the initial active uplink bandwidth part. Otherwise, the PRACH frequency domain resources n _RA are numbered in ascending order from the lowest frequency RO resource in the active uplink bandwidth part.

In NR, there is an association between the RO and the SSB (SS/PBCH block, synchronization signal/physical broadcast channel block, sometimes simply referred to as SS block, synchronization signal block) actually transmitted. Multiple SSBs may be associated with one RO, or multiple SSBs may be associated with one RO. Usually, different SSBs can be sent using different beams, and the terminal can also use a beam that is more compatible with the SSB on the RO of the associated SSB to perform repeated PRACH transmissions.

Figure 2 is a schematic diagram of the association relationship between RO and SSB. As shown in Figure 2, the number of ROs of FDM on a time instance is 8, and the number of SSBs actually transmitted is 4. For example, the corresponding SSBs are SSB#0, SSB#1, SSB#2, and SSB#3, and each SSB is associated with 2 ROs. If the UE sends PRACH on the RO corresponding to SSB0, the UE selects an RO from RO#0 and RO#1 to send PRACH.

Figure 3 is the second schematic diagram of the association relationship between RO and SSB. As shown in Figure 3, the number of ROs of FDM on a time instance is 2, and the number of SSBs actually transmitted is 8. For example, the corresponding SSBs are SSB#0, SSB#1, ..., SSB#7, and every 2 SSBs are associated with 1 RO. When multiple SSBs share one RO, the preamble sets associated with the multiple SSBs are different.

Note that the boxes shown in FIG. 2 and FIG. 3 are all ROs, and the SSBs marked in the boxes are the SSBs associated with the ROs.

Before sending PRACH, UE first performs resource selection, and first selects the RO corresponding to the SSB whose RSRP is higher than the threshold. If there are multiple SSBs higher than the threshold, the terminal can select any SSB. After determining the SSB, if the SSB is associated with multiple ROs, the terminal can select any one of the ROs for PRACH transmission. In the RO, a preamble is randomly selected from the preamble set associated with the SSB for PRACH transmission.

The format of the PDCCH that the network indicates PRACH transmission is shown in Table 1.

Table 1 indicates the format of PDCCH for PRACH transmission

The definition of PRACH mask index is shown in Table 2.

Table 2 Definition of PRACH mask index

When the network triggers PRACH transmission through PDCCH, it also indicates the index value of the RO for PRACH transmission and the index value of the SSB associated with the PRACH. Since one SSB is associated with up to 8 ROs, a mask can be used to indicate which RO to use for PRACH transmission, or to indicate that a RO is selected from a limited set of ROs, such as an odd RO or an even RO, for PRACH transmission.

The PRACH transmission method triggered by the network through PDCCH order is suitable for the scenario where downlink data arrives but uplink synchronization is lost. In the case of supporting PRACH repetition, it is also necessary to further support PDCCH ordered PRACH repetition transmission. Then, the resources of PRACH repetition transmission and the index of SSB associated with each repetition transmission need to be further clarified.

FIG. 4 is a flow chart of a PRACH repeated transmission method according to an embodiment of the present application. As shown in FIG. 4 , the method includes the following steps:

Step 400: The terminal receives a physical downlink control channel PDCCH;

The PDCCH includes at least one of the following:

First indication information used to instruct the terminal to perform PRACH repeated transmission;

Second indication information used to determine random access transmission opportunity RO resources;

The random access transmission opportunity RO resource is used for repeated transmission of the PRACH.

Step 401: The terminal performs repeated transmission of a physical random access channel PRACH according to the PDCCH.

In the embodiment of the present application, repeated transmission of PRACH may also be understood as performing multiple PRACH transmissions on multiple RO resources, and the PRACH preambles used in the multiple transmissions may be the same or different.

The terminal performs repeated transmission of a physical random access channel PRACH according to the PDCCH, including:

The terminal determines, according to the first indication information in the PDCCH, that the network side device instructs the PRACH to repeat transmission.

In other words, if the PDCCH detected by the terminal includes the first indication information, the terminal determines that the network side device instructs the terminal to perform PRACH repeated transmission. If the PDCCH detected by the terminal does not include the first indication information, the terminal determines that the network side device does not instruct the terminal to perform PRACH repeated transmission.

Optionally, the terminal performing repeated transmission of a physical random access channel PRACH according to the PDCCH may further include: the terminal determining a random access transmission opportunity RO resource for PRACH repetition according to second indication information in the PDCCH.

After determining the resource for PRACH repeated transmission, the terminal may perform PRACH repeated transmission on the resource.

In an embodiment of the present application, based on the received PDCCH, the network side device indicates PRACH repeated transmission and the RO resources used for PRACH repeated transmission, and PRACH repeated transmission is performed. PRACH repeated transmission can be triggered by PDCCH, thereby optimizing the random access process.

In some embodiments, the step 401 in which the terminal performs repeated transmission of a physical random access channel PRACH according to the PDCCH includes at least one of the following:

The terminal determines, according to the first indication information in the PDCCH, that the network side device indicates PRACH repeated transmission;

In the case of determining that the network side device indicates PRACH repeated transmission, the terminal determines a random access transmission opportunity RO resource for the PRACH repeated transmission according to the second indication information in the PDCCH.

In some embodiments, the first indication information includes at least one of the following:

An index value of a PRACH transmission, wherein the index value of the PRACH transmission is configured as a preamble index value for performing repeated transmission of the PRACH;

an uplink (UL)/supplementary uplink (SUL) indication field, wherein the UL/SUL indication field is interpreted by the terminal as indicating repeated transmission of the PRACH;

One or more code points in a PRACH mask index information field, the one or more code points being used to indicate repeated transmission of the PRACH;

The first bit field is used to indicate repeated transmission of the PRACH.

In one implementation, the terminal determines whether the network side device instructs PRACH to repeat transmission according to the index value of PRACH transmission.

In the case where the index value of the PRACH transmission is configured as the preamble index value used for PRACH repeated transmission, the terminal may determine that the PDCCH carries a PRACH repeated transmission indication, and then the terminal will perform PRACH repeated transmission.

The Random Access Preamble index in Table 1 is the index value of the PRACH transmission here.

Optionally, the preamble index value used for PRACH repeated transmission is configured by a network side device.

Optionally, the network side device configures an index value in the first preset range as a preamble index value for repeated PRACH transmission.

Then, when the value of the Random Access Preamble index information field in the PDCCH is within the first preset range, it indicates that the value is a preamble index value used for repeated PRACH transmissions, in other words, it indicates that the network side device indicates repeated PRACH transmissions.

In one implementation, the terminal determines whether the network side device indicates PRACH repeated transmission according to the UL/SUL indication field.

In the case where the UL/SUL indication field is interpreted by the terminal as being used to indicate repeated transmission of the PRACH, the terminal determines that the network side device indicates repeated transmission of the PRACH.

In other words, the field of UL/SUL indicator can be re-interpreted as an indication of PRACH repeated transmission.

For example, in the case of frequency range 2 (FR2), SUL will not be deployed, so this field can be re-interpreted to indicate PRACH repeated transmission.

In one implementation, the terminal determines whether the network side device indicates PRACH repeated transmission according to the value of one or more codepoints in the PRACH mask index information field.

For example, code points with mask index values of 11 to 15 in Table 2 may be used to indicate PRACH repeated transmission.

In one implementation, the first bit field indicates PRACH repeated transmission.

Among them, the first bit field is a new bit field.

For example, the bit field after the PRACH MASK index in Table 1 is used to indicate PRACH repeated transmission. These bits are currently reserved and can be reused.

The embodiment of the present application provides a design scheme of DCI in which PDCCH indicates repeated transmission of PRACH, thereby triggering repeated transmission of PRACH through PDCCH, thereby optimizing the random access process.

Furthermore, after the terminal determines that the network side device indicates PRACH repeated transmission, it can determine the RO resources for PRACH repeated transmission according to the PRACH repeated transmission resource indication in the PDCCH and the RO related configuration information provided by the network side device.

In some embodiments, the second indication information includes at least one of the following:

Synchronization signal block SSB index value and RO index value associated with PRACH transmission;

A second bit field, where the second bit field is used to indicate an RO set corresponding to the RO resource;

A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource.

The embodiment of the present application provides a design scheme of DCI in which PDCCH indicates PRACH repeated transmission resources, thereby triggering PRACH repeated transmission through PDCCH, thereby optimizing the random access process.

In some embodiments, the terminal repeatedly transmits a physical random access channel PRACH according to the PDCCH, including:

The terminal determines the RO resources corresponding to M PRACH repeated transmissions according to the synchronization signal block SSB index value and the RO index value associated with the PRACH transmission in the PDCCH, where M is a positive integer greater than 1 and is configured by a network side device.

Further, according to the synchronization signal block SSB index value and the RO index value associated with the PRACH transmission in the PDCCH, determining the RO resource corresponding to the M-times PRACH repeated transmission includes the following methods:

Method 1:

The terminal determines, according to the SSB index value and the RO index value associated with the PRACH transmission, the RO resource corresponding to the M-times of PRACH repeated transmission, including:

The terminal determines, according to the SSB index value and the RO index value associated with the PRACH transmission, a first RO in the RO resource;

The terminal determines a subsequent RO of the RO resource according to the first RO.

Among them, the SSB index value associated with PRACH transmission is the value of SS/PBCH index in Table 1, and the RO index value associated with PRACH transmission is the value of PRACH Mask index in Table 1.

The terminal may determine an RO according to the SSB index value and the RO index value associated with the PRACH transmission, and use the RO as the first RO in the RO resources corresponding to the M-times PRACH repeated transmission.

Then, subsequent ROs in RO resources corresponding to M times of PRACH repeated transmission are determined according to the first RO.

In some embodiments, the subsequent RO satisfies one of the following:

(1) The subsequent ROs are M-1 consecutive ROs having the same frequency position as the first RO;

In other words, the RO resources for the terminal to perform M times of PRACH repetition transmission are multiple consecutive ROs with the same frequency position.

(2) The subsequent RO is the RO associated with M-1 SSBs sent in the order of SSB index values after the SSB associated with the first RO;

Optionally, the index values of the ROs associated with the M SSBs are also the same.

For example, the network indicates RO#0 of SSB#2 and performs M=4 repeated transmissions. The index values of the SSBs actually sent are SSB#0, 2, 4, 5, 7. Then the RO resources for PRACH repeated transmissions are ({SSB#0, RO#0}, {SSB#2, RO#0}, {SSB#4, RO#0}, {{SSB#5, RO#0}}).

(3) the subsequent RO and the first RO belong to the same RO set, wherein the RO set is configured or predefined by a network-side device and includes a plurality of ROs;

It should be noted that the RO set can also be described as other RO resource units, such as an RO group. The RO resource unit includes multiple ROs.

The RO set/group configured by the network side device includes multiple ROs, and the multiple ROs can be associated with the same or different SSBs.

For example, the network configures Group X = ({SSB#a, RO#b}, {SSB#c, RO#d}, {SSB#e, RO#f}, {{SSB#g, RO#h}}) belonging to the same RO set/group. If PDCCH indicates {SSB#a, RO#b}, then group X = ({SSB#a, RO#b}, {SSB#c, RO#d}, {SSB#e, RO#f}, {{SSB#g, RO#h}}) is used for PRACH repeated transmission.

In the above (1)-(3), the SSBs associated with the repeated transmission of PRACH may be the same or different, which can be understood as using the same or different beams to correspond to the repeated transmission of PRACH.

(4) The subsequent ROs are M-1 ROs associated with the same SSB as the first RO.

Optionally, the index values of these ROs are all the same.

This solution corresponds to the same SSB associated with repeated PRACH transmission, which can be understood as using the same beam for repeated PRACH transmission.

Method 2:

The terminal determines, according to the SSB index value and the RO index value associated with the PRACH transmission, the RO resource corresponding to the M-times of PRACH repeated transmission, including:

The terminal determines, according to the SSB index value and the RO index value associated with the PRACH transmission, an RO corresponding to the SSB indicated by the PDCCH;

The terminal determines, according to the RO set configured by the network side device, a first RO set where an RO corresponding to the SSB indicated by the PDCCH is located;

The terminal determines M-1 ROs from the first RO set, and uses one RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs as RO resources corresponding to the M times of PRACH repeated transmission.

The RO set/group indicated by the network includes multiple ROs, and the multiple ROs can be associated with the same or different SSBs.

If the RO determined according to the PDCCH indication belongs to a certain RO set/group, the terminal performs PRACH repetitive transmission in multiple ROs included in the RO set/group.

At this time, the terminal is not limited to using the RO indicated by the PDCCH as the first RO of the PRACH repeated transmission.

For example, the network indicates RO#2 associated with SSB#2, and in the RO set/group configured by the network, {(SSB#0, RO#2), {SSB#2, RO#2}, {SSB#4, RO#4}, {SSB#6, RO#4}} is a group of RO, and {SSB#2, RO#2} belongs to the RO set/group, then the terminal uses multiple RO resources in the group for PRACH repeated transmission.

In an embodiment of the present application, according to the PRACH repetition transmission indication in the received PDCCH, it is determined that the network side device has indicated PRACH repetition transmission, and the RO resource of the PRACH repetition transmission can be determined according to the SSB index value and RO index value associated with the PRACH transmission in the PDCCH, so that PRACH repetition transmission can be triggered by PDCCH, thereby optimizing the random access process.

In addition, the terminal may also determine the RO resources used for repeated PRACH transmission according to the indication of the second bit field in the PDCCH.

Method 3:

In some embodiments, the terminal repeatedly transmits a physical random access channel PRACH according to the PDCCH, including:

The terminal determines, according to an indication of the second bit field, a second RO set from a plurality of RO sets configured by the network side device;

The terminal uses a plurality of ROs in the second RO set as the RO resources.

It can be understood that the network can configure a combination of multiple RO sets/groups, each RO set/group includes multiple ROs, and one of the multiple RO sets/groups is indicated by the second bit field in the PDCCH. The terminal determines an RO set/group based on the indication of the second bit field and performs PRACH repeated transmission.

In some embodiments, the second bit field is a code point in the PRACH mask index information field.

A possible solution is that the PRACH Mask Index field can be reused to indicate the RO combination for PRACH repeated transmission. In other words, the PRACH MASK Index field can be used to indicate one RO set/group among a maximum of 16 RO sets/groups for PRACH repeated transmission.

The embodiments of the present application provide a DCI design scheme for indicating PRACH repeated transmission resources, which can trigger PRACH repeated transmission through PDCCH, thereby optimizing the random access process.

Method 4:

The terminal may also implicitly determine the RO resources for repeated PRACH transmission according to the target parameters indicated by the PDCCH.

That is, the terminal performs repeated transmission of a physical random access channel PRACH according to the PDCCH, including:

The terminal determines the RO resource according to the target parameter;

The target parameter includes one of the following:

The frequency resource position corresponding to the RO resource;

The remainder of the RO index value corresponding to the RO resource.

The terminal determines the RO resource according to the target parameter, including one of the following:

(1) The terminal determines N ROs with the same frequency resource position according to the frequency resource position corresponding to the RO resource indicated by the PDCCH, and uses the N ROs with the same frequency resource position as RO resources for repeated transmission of the PRACH.

(2) The terminal determines N RO index values according to the remainder of the RO index value corresponding to the RO resource indicated by the PDCCH, and the specific determination method is mod(RO index, P)=Q, where Q is the remainder of the RO index value corresponding to the RO resource indicated by the PDCCH, P can be a preset value or a value configured by the network side device, and RO index is the index value sequence of the RO sorted by time and/or frequency. The N ROs corresponding to the N RO index values are used as RO resources for repeated transmission of the PRACH.

Wherein, N is a positive integer.

The embodiment of the present application provides another DCI design scheme for indicating PRACH repeated transmission resources, which can trigger PRACH repeated transmission through PDCCH, thereby optimizing the random access process.

The PRACH repeated transmission method provided in the embodiment of the present application further designs the DCI, and newly introduces a mechanism for determining the PRACH repeated transmission resources, supports the mechanism of PDCCH triggering PRACH repeated transmission, and can optimize the random access process.

FIG5 is a second flow chart of the PRACH repeated transmission method provided in an embodiment of the present application. As shown in FIG5 , the method includes the following steps:

Step 500: The network side device sends a physical downlink control channel PDCCH to the terminal;

The PDCCH includes at least one of the following:

First indication information used to instruct the terminal to perform PRACH repeated transmission;

Second indication information used to determine random access transmission opportunity RO resources;

The random access transmission opportunity RO resource is used for repeated transmission of the PRACH.

It can be understood that the network side device can send a PDCCH including at least one of a PRACH repetition transmission indication and a PRACH repetition transmission resource indication to the terminal to support PDCCH triggering PRACH repetition transmission.

The first indication information is used to instruct the terminal to perform PRACH repeated transmission.

The second indication information is used to determine the random access transmission opportunity RO resource, that is, the second indication information is used to indicate the RO resource for the terminal to perform PRACH repeated transmission.

In an embodiment of the present application, a PDCCH is sent to a terminal, and the PDCCH includes at least one of a PRACH repetition transmission indication and a PRACH repetition transmission resource indication, so that the terminal can determine the information of the PRACH repetition transmission, thereby triggering the PRACH repetition transmission through the PDCCH, and optimizing the random access process.

In some embodiments, the first indication information includes at least one of the following:

An index value of a PRACH transmission, wherein the index value of the PRACH transmission is configured as a preamble index value for performing repeated transmission of the PRACH;

an uplink UL/supplementary uplink SUL indication field, wherein the UL/SUL indication field is interpreted by the terminal as indicating repeated transmission of the PRACH;

One or more code points in a PRACH mask index information field, the one or more code points being used to indicate repeated transmission of the PRACH;

The first bit field is used to indicate repeated transmission of the PRACH.

In one implementation, the network side device uses the index value of the PRACH transmission to indicate PRACH repeated transmission.

In the case where the index value of the PRACH transmission is configured as the preamble index value used for PRACH repeated transmission, the terminal may determine that the PDCCH carries a PRACH repeated transmission indication, and then the terminal will perform PRACH repeated transmission.

The Random Access Preamble index in Table 1 is the index value of the PRACH transmission here.

Optionally, the preamble index value used for PRACH repeated transmission is configured by a network side device.

Optionally, the network side device configures an index value in the first preset range as a preamble index value for repeated PRACH transmission.

Then, when the value of the Random Access Preamble index information field in the PDCCH is within the first preset range, it indicates that the value is a preamble index value used for repeated transmission of the PRACH, in other words, it indicates that the network side device indicates repeated transmission of the PRACH.

In one implementation, the network side device uses the UL/SUL indication field to indicate PRACH repeated transmission.

In the case where the UL/SUL indication field is interpreted by the terminal as being used to indicate repeated transmission of the PRACH, the terminal determines that the network side device indicates repeated transmission of the PRACH.

In other words, the field of UL/SUL indicator can be re-interpreted as an indication of PRACH repeated transmission.

For example, in the case of frequency range 2 (FR2), SUL will not be deployed, so this field can be re-interpreted to indicate PRACH repeated transmission.

In one implementation, one or more codepoints in the PRACH mask index information field of the network side device indicate PRACH repeated transmission.

For example, code points with mask index values of 11 to 15 in Table 2 may be used to indicate PRACH repeated transmission.

In one implementation, the network side device uses the first bit field to indicate PRACH repeated transmission.

Among them, the first bit field is a new bit field.

For example, the bit field after the PRACH MASK index in Table 1 is used to indicate PRACH repeated transmission. These bits are currently reserved and can be reused.

The embodiment of the present application provides a design scheme of DCI in which PDCCH indicates repeated transmission of PRACH, thereby triggering repeated transmission of PRACH through PDCCH, thereby optimizing the random access process.

In some embodiments, the second indication information includes at least one of the following:

Synchronization signal block SSB index value and RO index value associated with PRACH transmission;

A second bit field, where the second bit field is used to indicate an RO set corresponding to the RO resource;

A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource.

The embodiment of the present application provides a design scheme of DCI in which PDCCH indicates PRACH repeated transmission resources, thereby triggering PRACH repeated transmission through PDCCH, thereby optimizing the random access process.

Optionally, the terminal determines the RO resources corresponding to M times of repeated PRACH transmission according to the SSB index value and the RO index value of the synchronization signal block associated with the PRACH transmission in the PDCCH.

In one implementation, the terminal determines the first RO in the RO resource according to the SSB index value and the RO index value associated with the PRACH transmission in the PDCCH; and the terminal determines subsequent ROs of the RO resource according to the first RO.

In another implementation, the terminal determines an RO corresponding to the SSB indicated by the PDCCH based on the SSB index value and the RO index value associated with the PRACH transmission in the PDCCH; then determines a first RO set including an RO corresponding to the SSB indicated by the PDCCH based on the RO set configured by the network side device, determines M-1 ROs from the first RO set, and uses the RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs as RO resources corresponding to the M times PRACH repeated transmission.

Optionally, the terminal determines a second RO set from multiple RO sets configured by the network-side device according to an indication of the second bit field, and uses multiple ROs in the second RO set as RO resources for repeated transmission of the PRACH.

Optionally, the terminal implicitly determines the RO resources for repeated PRACH transmission according to the target parameter indicated by the PDCCH.

The embodiments of the present application provide a DCI design scheme for indicating PRACH repeated transmission resources, which can trigger PRACH repeated transmission through PDCCH, thereby optimizing the random access process.

It should be noted that when the terminal determines the RO resources corresponding to the PRACH repeated transmission through the above-mentioned various methods, it needs to combine the RO set information configured by the network side device.

Therefore, in some embodiments, the method further comprises:

At least one RO set information is sent to the terminal, where the RO set information is used to indicate an RO set where RO resources available for PRACH repeated transmission by the terminal are located.

In some embodiments, the second bit field is a code point in the PRACH mask index information field.

At this time, the network side device can reuse the PRACH Mask Index field to indicate the RO combination for PRACH repeated transmission. In other words, the network side device can indicate one RO set/group among a maximum of 16 RO sets/groups for PRACH repeated transmission through the PRACH MASK Index field.

In some embodiments, the target parameter includes one of the following:

The frequency resource position corresponding to the RO resource;

The remainder of the RO index value corresponding to the RO resource.

The PRACH repeated transmission method provided in the embodiment of the present application further designs the DCI, and newly introduces a mechanism for determining the PRACH repeated transmission resources, supports the mechanism of PDCCH triggering PRACH repeated transmission, and can optimize the random access process.

It should be noted that the PRACH repeated transmission method provided in the embodiment of the present application can be executed by a PRACH repeated transmission device, or a control module in the PRACH repeated transmission device for executing the PRACH repeated transmission method. In the embodiment of the present application, the PRACH repeated transmission device executing the PRACH repeated transmission method is taken as an example to illustrate the PRACH repeated transmission device provided in the embodiment of the present application.

FIG. 6 is a schematic diagram of a structure of a PRACH repeated transmission device provided in an embodiment of the present application. As shown in FIG. 6 , the PRACH repeated transmission device 600 includes:

The first receiving unit 610 is configured to receive a physical downlink control channel PDCCH;

A first processing unit 620 is configured to perform repeated transmission of a physical random access channel PRACH according to the PDCCH;

The PDCCH includes at least one of the following:

First indication information used to instruct the terminal to perform PRACH repeated transmission;

Second indication information used to determine random access transmission opportunity RO resources;

The random access transmission opportunity RO resource is used for repeated transmission of the PRACH.

In the embodiment of the present application, PRACH retransmission is performed according to the received PDCCH, and PRACH retransmission can be triggered by PDCCH, thereby optimizing the random access process.

Optionally, the first indication information includes at least one of the following:

An index value of a PRACH transmission, wherein the index value of the PRACH transmission is configured as a preamble index value for performing repeated transmission of the PRACH;

an uplink UL/supplementary uplink SUL indication field, wherein the UL/SUL indication field is interpreted by the terminal as indicating repeated transmission of the PRACH;

One or more code points in a PRACH mask index information field, the one or more code points being used to indicate repeated transmission of the PRACH;

The first bit field is used to indicate repeated transmission of the PRACH.

The embodiment of the present application provides a design scheme of DCI in which PDCCH indicates repeated transmission of PRACH, thereby triggering repeated transmission of PRACH through PDCCH, thereby optimizing the random access process.

Optionally, the second indication information includes at least one of the following:

Synchronization signal block SSB index value and RO index value associated with PRACH transmission;

A second bit field, where the second bit field is used to indicate an RO set corresponding to the RO resource;

A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource.

The embodiment of the present application provides a design scheme of DCI in which PDCCH indicates PRACH repeated transmission resources, thereby triggering PRACH repeated transmission through PDCCH, thereby optimizing the random access process.

Optionally, the performing repeated transmission of a physical random access channel PRACH according to the PDCCH includes:

According to the synchronization signal block SSB index value and RO index value associated with the PRACH transmission, the RO resources corresponding to M PRACH repeated transmissions are determined, where M is a positive integer greater than 1 and is configured by the network side device.

Optionally, determining, according to the SSB index value and the RO index value associated with the PRACH transmission, the RO resource corresponding to the M-times of repeated PRACH transmission includes:

Determine a first RO in the RO resource according to the SSB index value and the RO index value associated with the PRACH transmission;

According to the first RO, a subsequent RO of the RO resource is determined.

Optionally, the subsequent RO satisfies one of the following:

The subsequent ROs are M-1 consecutive ROs having the same frequency position as the first RO;

The subsequent RO is the RO associated with M-1 SSBs sent in the order of SSB index values after the SSB associated with the first RO;

The subsequent RO and the first RO belong to the same RO set, wherein the RO set is configured or predefined by a network side device and includes multiple ROs;

The subsequent ROs are M-1 ROs associated with the same SSB as the first RO.

Optionally, determining, according to the SSB index value and the RO index value associated with the PRACH transmission, the RO resource corresponding to the M-times of repeated PRACH transmission includes:

Determine, according to the SSB index value and the RO index value associated with the PRACH transmission, an RO corresponding to the SSB indicated by the PDCCH;

Determine, according to the RO set configured by the network side device, a first RO set where an RO corresponding to the SSB indicated by the PDCCH is located;

Determine M-1 ROs from the first RO set, and use one RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs as RO resources corresponding to the M times of PRACH repeated transmission.

In an embodiment of the present application, according to the PRACH repetition transmission indication in the received PDCCH, it is determined that the network side device has indicated PRACH repetition transmission, and the RO resource of the PRACH repetition transmission can be determined according to the SSB index value and RO index value associated with the PRACH transmission in the PDCCH, so that PRACH repetition transmission can be triggered by PDCCH, thereby optimizing the random access process.

Optionally, the performing repeated transmission of a physical random access channel PRACH according to the PDCCH includes:

Determine, according to the indication of the second bit field, a second RO set from multiple RO sets configured by the network side device;

A plurality of ROs in the second RO set are used as the RO resources.

Optionally, the second bit field is a code point in a PRACH mask index information field.

The embodiments of the present application provide a DCI design scheme for indicating PRACH repeated transmission resources, which can trigger PRACH repeated transmission through PDCCH, thereby optimizing the random access process.

Optionally, the performing repeated transmission of a physical random access channel PRACH according to the PDCCH includes:

Determining the RO resource according to the target parameter;

The target parameter includes one of the following:

The frequency resource position corresponding to the RO resource;

The remainder of the RO index value corresponding to the RO resource.

Optionally, determining the RO resource according to the target parameter includes one of the following:

Determine, according to the frequency resource position corresponding to the RO resource, N ROs with the same frequency resource position, and use the N ROs with the same frequency resource position as RO resources for repeated transmission of the PRACH;

Determine N RO index values according to the remainder of the RO index value corresponding to the RO resource, and use the N ROs corresponding to the N RO index values as RO resources for repeated transmission of the PRACH;

Wherein, N is a positive integer.

The embodiment of the present application provides another DCI design scheme for indicating PRACH repeated transmission resources, which can trigger PRACH repeated transmission through PDCCH, thereby optimizing the random access process.

The PRACH repeated transmission device provided in the embodiment of the present application further designs the DCI, and newly introduces a mechanism for determining the PRACH repeated transmission resources, supports the mechanism of PDCCH triggering PRACH repeated transmission, and can optimize the random access process.

The PRACH repetitive transmission device in the embodiment of the present application may be a device, a device or an electronic device having an operating system, or a component, an integrated circuit, or a chip in a terminal. The device or electronic device may be a mobile terminal or a non-mobile terminal. Exemplarily, the mobile terminal may include but is not limited to the types of terminals 11 listed above, and the non-mobile terminal may be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), a teller machine or a self-service machine, etc., which is not specifically limited in the embodiment of the present application.

The PRACH repeated transmission device provided in the embodiment of the present application can implement each process implemented by the method embodiment of Figure 4 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

FIG. 7 is a second structural diagram of a PRACH repeated transmission device provided in an embodiment of the present application. As shown in FIG. 7 , the PRACH repeated transmission device 700 includes:

The first sending unit 710 is configured to send a physical downlink control channel PDCCH to a terminal;

The PDCCH includes at least one of the following:

First indication information used to instruct the terminal to perform PRACH repeated transmission;

Second indication information used to determine random access transmission opportunity RO resources;

The random access transmission opportunity RO resource is used for repeated transmission of the PRACH.

In an embodiment of the present application, a PDCCH is sent to a terminal, and the PDCCH includes at least one of a PRACH repeated transmission indication and a PRACH repeated transmission resource indication, so that the terminal can determine the information of the PRACH repeated transmission, thereby triggering the PRACH repeated transmission through the PDCCH, and optimizing the random access process.

Optionally, the first indication information includes at least one of the following:

An index value of a PRACH transmission, wherein the index value of the PRACH transmission is configured as a preamble index value for performing repeated transmission of the PRACH;

an uplink UL/supplementary uplink SUL indication field, wherein the UL/SUL indication field is interpreted by the terminal as indicating repeated transmission of the PRACH;

One or more code points in a PRACH mask index information field, the one or more code points being used to indicate repeated transmission of the PRACH;

The first bit field is used to indicate repeated transmission of the PRACH.

The embodiment of the present application provides a design scheme of DCI in which PDCCH indicates repeated transmission of PRACH, thereby triggering repeated transmission of PRACH through PDCCH, thereby optimizing the random access process.

Optionally, the second indication information includes at least one of the following:

Synchronization signal block SSB index value and RO index value associated with PRACH transmission;

A second bit field, where the second bit field is used to indicate an RO set corresponding to the RO resource;

A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource.

The embodiments of the present application provide a DCI design scheme for indicating PRACH repeated transmission resources, which can trigger PRACH repeated transmission through PDCCH, thereby optimizing the random access process.

Optionally, the device further comprises:

The second sending unit is used to send at least one RO set information to the terminal, where the RO set information is used to indicate the RO set where the RO resources available for PRACH repeated transmission by the terminal are located.

Optionally, the second bit field is a code point in a PRACH mask index information field.

Optionally, the target parameter includes one of the following:

The frequency resource position corresponding to the RO resource;

The remainder of the RO index value corresponding to the RO resource.

The PRACH repeated transmission device provided in the embodiment of the present application further designs the DCI, and newly introduces a mechanism for determining the PRACH repeated transmission resources, supports the mechanism of PDCCH triggering PRACH repeated transmission, and can optimize the random access process.

The PRACH repeated transmission device in the embodiment of the present application can be a device, a device with an operating system or a network side device, or it can be a component, an integrated circuit, or a chip in the network side device.

The PRACH repeated transmission device provided in the embodiment of the present application can implement each process implemented by the method embodiment of Figure 5 and achieve the same technical effect. To avoid repetition, it will not be repeated here.

Optionally, as shown in FIG8 , an embodiment of the present application further provides a communication device 800, including a processor 801, a memory 802, and a program or instruction stored in the memory 802 and executable on the processor 801. For example, when the communication device 800 is a terminal, the program or instruction is executed by the processor 801 to implement the various processes of the above-mentioned PRACH repeated transmission method embodiment, and the same technical effect can be achieved. When the communication device 800 is a network side device, the program or instruction is executed by the processor 801 to implement the various processes of the above-mentioned PRACH repeated transmission method embodiment, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

The embodiment of the present application also provides a terminal, including a processor and a communication interface, the communication interface is used to receive a physical downlink control channel PDCCH, and the processor is used to perform PRACH repeated transmission according to the PDCCH, wherein the PDCCH includes at least one of the following: first indication information for instructing the terminal to perform PRACH repeated transmission; second indication information for determining random access transmission opportunity RO resources; wherein the random access transmission opportunity RO resources are used for the PRACH repeated transmission. This terminal embodiment corresponds to the above-mentioned terminal side method embodiment, and each implementation process and implementation method of the above-mentioned method embodiment can be applied to the terminal embodiment, and can achieve the same technical effect. Specifically, Figure 9 is a schematic diagram of the hardware structure of a terminal that implements an embodiment of the present application.

The terminal 900 includes but is not limited to: a radio frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909, and at least some of the components of a processor 910.

Those skilled in the art will appreciate that the terminal 900 may also include a power source (such as a battery) for supplying power to each component, and the power source may be logically connected to the processor 910 through a power management system, so as to implement functions such as charging, discharging, and power consumption management through the power management system. The terminal structure shown in FIG9 does not constitute a limitation on the terminal, and the terminal may include more or fewer components than shown, or combine certain components, or arrange components differently, which will not be described in detail here.

It should be understood that in the embodiment of the present application, the input unit 904 may include a graphics processor (Graphics Processing Unit, GPU) 9041 and a microphone 9042, and the graphics processor 9041 processes the image data of the static picture or video obtained by the image capture device (such as a camera) in the video capture mode or the image capture mode. The display unit 906 may include a display panel 9061, and the display panel 9061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 907 includes a touch panel 9071 and other input devices 9072. The touch panel 9071 is also called a touch screen. The touch panel 9071 may include two parts: a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

In the embodiment of the present application, the radio frequency unit 901 receives downlink data from the network side device and sends it to the processor 910 for processing; in addition, the uplink data is sent to the network side device. Generally, the radio frequency unit 901 includes but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

The memory 909 can be used to store software programs or instructions and various data. The memory 909 may mainly include a program or instruction storage area and a data storage area, wherein the program or instruction storage area may store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 909 may include a high-speed random access memory, and may also include a non-volatile memory, wherein the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. For example, at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device.

The processor 910 may include one or more processing units; optionally, the processor 910 may integrate an application processor and a modem processor, wherein the application processor mainly processes an operating system, a user interface, and application programs or instructions, etc., and the modem processor mainly processes wireless communications, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 910.

The radio frequency unit 901 is used to receive a physical downlink control channel PDCCH;

The processor 910 is configured to perform repeated transmission of a physical random access channel PRACH according to the PDCCH;

The PDCCH includes at least one of the following:

First indication information used to instruct the terminal to perform PRACH repeated transmission;

Second indication information used to determine random access transmission opportunity RO resources;

The random access transmission opportunity RO resource is used for repeated transmission of the PRACH.

In the embodiment of the present application, PRACH retransmission is performed according to the received PDCCH, and PRACH retransmission can be triggered by PDCCH, thereby optimizing the random access process.

Optionally, the first indication information includes at least one of the following:

An index value of a PRACH transmission, wherein the index value of the PRACH transmission is configured as a preamble index value for performing repeated transmission of the PRACH;

an uplink UL/supplementary uplink SUL indication field, wherein the UL/SUL indication field is interpreted by the terminal as indicating repeated transmission of the PRACH;

One or more code points in a PRACH mask index information field, the one or more code points being used to indicate repeated transmission of the PRACH;

The first bit field is used to indicate repeated transmission of the PRACH.

The embodiment of the present application provides a design scheme of DCI in which PDCCH indicates repeated transmission of PRACH, thereby triggering repeated transmission of PRACH through PDCCH, thereby optimizing the random access process.

Optionally, the second indication information includes at least one of the following:

Synchronization signal block SSB index value and RO index value associated with PRACH transmission;

A second bit field, where the second bit field is used to indicate an RO set corresponding to the RO resource;

A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource.

Optionally, the processor 910 is further configured to:

According to the synchronization signal block SSB index value and RO index value associated with the PRACH transmission, the RO resources corresponding to M PRACH repeated transmissions are determined, where M is a positive integer greater than 1 and is configured by the network side device.

Optionally, determining, according to the SSB index value and the RO index value associated with the PRACH transmission, the RO resource corresponding to the M-times of repeated PRACH transmission includes:

Determine a first RO in the RO resource according to the SSB index value and the RO index value associated with the PRACH transmission;

According to the first RO, a subsequent RO of the RO resource is determined.

Optionally, the subsequent RO satisfies one of the following:

The subsequent ROs are M-1 consecutive ROs having the same frequency position as the first RO;

The subsequent RO is the RO associated with M-1 SSBs sent in the order of SSB index values after the SSB associated with the first RO;

The subsequent RO and the first RO belong to the same RO set, wherein the RO set is configured or predefined by a network side device and includes multiple ROs;

The subsequent ROs are M-1 ROs associated with the same SSB as the first RO.

Optionally, determining, according to the SSB index value and the RO index value associated with the PRACH transmission, the RO resource corresponding to the M-times of repeated PRACH transmission includes:

Determine, according to the SSB index value and the RO index value associated with the PRACH transmission, an RO corresponding to the SSB indicated by the PDCCH;

Determine, according to the RO set configured by the network side device, a first RO set where an RO corresponding to the SSB indicated by the PDCCH is located;

Determine M-1 ROs from the first RO set, and use one RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs as RO resources corresponding to the M times of PRACH repeated transmission.

In an embodiment of the present application, the terminal determines that the network side device has indicated PRACH repetition transmission based on the PRACH repetition transmission indication in the received PDCCH, and can determine the RO resources for PRACH repetition transmission based on the SSB index value and RO index value associated with the PRACH transmission in the PDCCH, so that PRACH repetition transmission can be triggered by PDCCH, thereby optimizing the random access process.

Optionally, the processor 910 is further configured to:

Determine, according to the indication of the second bit field, a second RO set from multiple RO sets configured by the network side device;

Multiple ROs in the second RO set are used as RO resources for repeated PRACH transmission.

Optionally, the second bit field is a code point in a PRACH mask index information field.

The embodiments of the present application provide a DCI design scheme for indicating PRACH repeated transmission resources, which can trigger PRACH repeated transmission through PDCCH, thereby optimizing the random access process.

Optionally, the processor 910 is further configured to:

Determining the RO resource according to the target parameter;

The target parameter includes one of the following:

The frequency resource position corresponding to the RO resource;

The remainder of the RO index value corresponding to the RO resource.

Optionally, determining the RO resource according to the target parameter includes one of the following:

Determine, according to the frequency resource position corresponding to the RO resource, N ROs with the same frequency resource position, and use the N ROs with the same frequency resource position as RO resources for repeated transmission of the PRACH;

Determine N RO index values according to the remainder of the RO index value corresponding to the RO resource, and use the N ROs corresponding to the N RO index values as RO resources for repeated transmission of the PRACH;

Wherein, N is a positive integer.

The embodiment of the present application provides another DCI design scheme for indicating PRACH repeated transmission resources, which can trigger PRACH repeated transmission through PDCCH, thereby optimizing the random access process.

In the embodiment of the present application, the DCI is further designed, and a new mechanism for determining PRACH repeated transmission resources is introduced, which supports the mechanism of PDCCH triggering PRACH repeated transmission, and can optimize the random access process.

The embodiment of the present application also provides a network side device, including a processor and a communication interface, the communication interface is used to send a physical downlink control channel PDCCH to a terminal; wherein the PDCCH includes at least one of the following: first indication information for instructing the terminal to perform PRACH repeated transmission; second indication information for determining random access transmission opportunity RO resources; wherein the random access transmission opportunity RO resources are used for the PRACH repeated transmission. This network side device embodiment corresponds to the above-mentioned network side device method embodiment, and each implementation process and implementation method of the above-mentioned method embodiment can be applied to this network side device embodiment, and can achieve the same technical effect.

Specifically, the embodiment of the present application also provides a network side device. As shown in Figure 10, the network side device 1000 includes: an antenna 1001, a radio frequency device 1002, and a baseband device 1003. The antenna 1001 is connected to the radio frequency device 1002. In the uplink direction, the radio frequency device 1002 receives information through the antenna 1001 and sends the received information to the baseband device 1003 for processing. In the downlink direction, the baseband device 1003 processes the information to be sent and sends it to the radio frequency device 1002. The radio frequency device 1002 processes the received information and sends it out through the antenna 1001.

The frequency band processing device may be located in the baseband device 1003 . The method performed by the network-side device in the above embodiment may be implemented in the baseband device 1003 . The baseband device 1003 includes a processor 1004 and a memory 1005 .

The baseband device 1003 may include, for example, at least one baseband board, on which multiple chips are arranged, as shown in Figure 10, one of which is, for example, a processor 1004, which is connected to the memory 1005 to call the program in the memory 1005 and execute the network side device operations shown in the above method embodiment.

The baseband device 1003 may further include a network interface 1006 for exchanging information with the radio frequency device 1002 . The interface may be, for example, a common public radio interface (CPRI).

Specifically, the network side device of the embodiment of the present invention also includes: instructions or programs stored in the memory 1005 and executable on the processor 1004. The processor 1004 calls the instructions or programs in the memory 1005 to execute the method executed by each module shown in Figure 7 and achieves the same technical effect. To avoid repetition, it will not be repeated here.

An embodiment of the present application also provides a readable storage medium, on which a program or instruction is stored. When the program or instruction is executed by a processor, each process of the above-mentioned PRACH repeated transmission method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the above-mentioned PRACH repeated transmission method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

An embodiment of the present application also provides a computer program/program product, which is stored in a non-volatile storage medium. The program/program product is executed by at least one processor to implement the various processes of the above-mentioned system message report reporting method embodiment, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

It should be noted that, in this article, the term "comprises", "includes" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM/RAM, a disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present application and the claims, all of which are within the protection of the present application.

Claims (35)

1. A PRACH repeated transmission method, comprising: The terminal receives a physical downlink control channel PDCCH; The terminal performs repeated transmission of a physical random access channel PRACH according to the PDCCH; The PDCCH includes at least one of the following: First indication information used to instruct the terminal to perform PRACH repeated transmission; Second indication information used to determine random access transmission opportunity RO resources; The random access transmission opportunity RO resource is used for repeated transmission of the PRACH. 2. The PRACH repeated transmission method according to claim 1, wherein the first indication information comprises at least one of the following: An index value of a PRACH transmission, wherein the index value of the PRACH transmission is configured as a preamble index value for performing repeated transmission of the PRACH; an uplink UL/supplementary uplink SUL indication field, wherein the UL/SUL indication field is interpreted by the terminal as indicating repeated transmission of the PRACH; One or more code points in a PRACH mask index information field, the one or more code points being used to indicate repeated transmission of the PRACH; The first bit field is used to indicate repeated transmission of the PRACH. 3. The PRACH repeated transmission method according to claim 1 or 2, characterized in that the second indication information includes at least one of the following: Synchronization signal block SSB index value and RO index value associated with PRACH transmission; A second bit field, where the second bit field is used to indicate an RO set corresponding to the RO resource; A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource. 4. The PRACH repeated transmission method according to claim 3, characterized in that the terminal performs physical random access channel PRACH repeated transmission according to the PDCCH, comprising: The terminal determines the RO resources corresponding to M PRACH repeated transmissions according to the SSB index value and the RO index value of the synchronization signal block associated with the PRACH transmission, where M is a positive integer greater than 1 and is configured by a network side device. 5. The PRACH repeated transmission method according to claim 4, characterized in that the terminal determines the RO resource corresponding to the M-times PRACH repeated transmission according to the SSB index value and the RO index value associated with the PRACH transmission, comprising: The terminal determines, according to the SSB index value and the RO index value associated with the PRACH transmission, a first RO in the RO resource; The terminal determines a subsequent RO of the RO resource according to the first RO. 6. The PRACH repeated transmission method according to claim 5, characterized in that the subsequent RO satisfies one of the following: The subsequent ROs are M-1 consecutive ROs having the same frequency position as the first RO; The subsequent RO is the RO associated with M-1 SSBs sent in the order of SSB index values after the SSB associated with the first RO; The subsequent RO and the first RO belong to the same RO set, wherein the RO set is configured or predefined by a network side device and includes multiple ROs; The subsequent ROs are M-1 ROs associated with the same SSB as the first RO. 7. The PRACH repeated transmission method according to claim 4, characterized in that the terminal determines the RO resource corresponding to the M-times PRACH repeated transmission according to the SSB index value and the RO index value associated with the PRACH transmission, comprising: The terminal determines, according to an SSB index value and an RO index value associated with the PRACH transmission in the PDCCH, a RO corresponding to the SSB indicated by the PDCCH; The terminal determines, according to the RO set configured by the network side device, a first RO set where an RO corresponding to the SSB indicated by the PDCCH is located; The terminal determines M-1 ROs from the first RO set, and uses one RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs as RO resources corresponding to the M times of PRACH repeated transmission. 8. The PRACH repeated transmission method according to claim 3, characterized in that the terminal performs physical random access channel PRACH repeated transmission according to the PDCCH, comprising: The terminal determines, according to an indication of the second bit field, a second RO set from a plurality of RO sets configured by the network side device; The terminal uses a plurality of ROs in the second RO set as the RO resources. 9. The PRACH repeated transmission method according to claim 8, characterized in that the second bit field is a code point in the PRACH mask index information field. 10. The PRACH repeated transmission method according to claim 3, characterized in that the terminal performs physical random access channel PRACH repeated transmission according to the PDCCH, comprising: The terminal determines the RO resource according to the target parameter; The target parameter includes one of the following: The frequency resource position corresponding to the RO resource; The remainder of the RO index value corresponding to the RO resource. 11. The PRACH repeated transmission method according to claim 10, wherein the terminal determines the RO resource according to the target parameter, including one of the following: The terminal determines, according to the frequency resource position corresponding to the RO resource, N ROs with the same frequency resource position, and uses the N ROs with the same frequency resource position as the RO resource; The terminal determines N RO index values according to the remainder of the RO index value corresponding to the RO resource, and uses the N ROs corresponding to the N RO index values as the RO resources; Wherein, N is a positive integer. 12. A PRACH repeated transmission method, comprising: The network side device sends the physical downlink control channel PDCCH to the terminal; The PDCCH includes at least one of the following: First indication information used to instruct the terminal to perform PRACH repeated transmission; Second indication information used to determine random access transmission opportunity RO resources; The random access transmission opportunity RO resource is used for repeated transmission of the PRACH. 13. The PRACH repeated transmission method according to claim 12, wherein the first indication information comprises at least one of the following: An index value of a PRACH transmission, wherein the index value of the PRACH transmission is configured as a preamble index value for performing repeated transmission of the PRACH; an uplink UL/supplementary uplink SUL indication field, wherein the UL/SUL indication field is interpreted by the terminal as indicating repeated transmission of the PRACH; One or more code points in the PRACH mask index information field, the code points being used to indicate repeated transmission of the PRACH; The first bit field is used to indicate repeated transmission of the PRACH. 14. The PRACH repeated transmission method according to claim 12 or 13, characterized in that the second indication information comprises at least one of the following: Synchronization signal block SSB index value and RO index value associated with PRACH transmission; A second bit field, where the second bit field is used to indicate an RO set corresponding to the RO resource; A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource. 15. The PRACH repeated transmission method according to claim 14, characterized in that the method further comprises: At least one RO set information is sent to the terminal, where the RO set information is used to indicate an RO set where RO resources available for PRACH repeated transmission by the terminal are located. 16. The PRACH repeated transmission method according to claim 14, characterized in that the second bit field is a code point in the PRACH mask index information field. 17. The PRACH repeated transmission method according to claim 14, wherein the target parameter comprises one of the following: The frequency resource position corresponding to the RO resource; The remainder of the RO index value corresponding to the RO resource. 18. A PRACH repeated transmission device, comprising: A first receiving unit, configured to receive a physical downlink control channel PDCCH; A first processing unit, configured to perform repeated transmission of a physical random access channel PRACH according to the PDCCH; The PDCCH includes at least one of the following: First indication information used to instruct the terminal to perform PRACH repeated transmission; Second indication information used to determine random access transmission opportunity RO resources; The random access transmission opportunity RO resource is used for repeated transmission of the PRACH. 19. The PRACH repeated transmission device according to claim 18, wherein the first indication information comprises at least one of the following: An index value of a PRACH transmission, wherein the index value of the PRACH transmission is configured as a preamble index value for performing repeated transmission of the PRACH; an uplink UL/supplementary uplink SUL indication field, wherein the UL/SUL indication field is interpreted by the terminal as indicating repeated transmission of the PRACH; One or more code points in a PRACH mask index information field, the one or more code points being used to indicate repeated transmission of the PRACH; The first bit field is used to indicate repeated transmission of the PRACH. 20. The PRACH repeated transmission device according to claim 18 or 19, wherein the second indication information comprises at least one of the following: Synchronization signal block SSB index value and RO index value associated with PRACH transmission; A second bit field, where the second bit field is used to indicate an RO set corresponding to the RO resource; A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource. 21. The PRACH repeated transmission device according to claim 20, characterized in that the performing physical random access channel PRACH repeated transmission according to the PDCCH comprises: According to the synchronization signal block SSB index value and RO index value associated with the PRACH transmission, the RO resources corresponding to M PRACH repeated transmissions are determined, where M is a positive integer greater than 1 and is configured by the network side device. 22. The PRACH repeated transmission device according to claim 21, characterized in that the step of determining the RO resource corresponding to the M-times PRACH repeated transmission according to the SSB index value and the RO index value associated with the PRACH transmission comprises: Determine a first RO in the RO resource according to the SSB index value and the RO index value associated with the PRACH transmission; According to the first RO, a subsequent RO of the RO resource is determined. 23. The PRACH repeated transmission device according to claim 22, characterized in that the subsequent RO satisfies one of the following: The subsequent ROs are M-1 consecutive ROs having the same frequency position as the first RO; The subsequent RO is the RO associated with M-1 SSBs sent in the order of SSB index values after the SSB associated with the first RO; The subsequent RO and the first RO belong to the same RO set, wherein the RO set is configured or predefined by a network side device and includes multiple ROs; The subsequent ROs are M-1 ROs associated with the same SSB as the first RO. 24. The PRACH repeated transmission device according to claim 21, characterized in that the step of determining the RO resource corresponding to the M-times PRACH repeated transmission according to the SSB index value and the RO index value associated with the PRACH transmission comprises: Determine, according to the SSB index value and the RO index value associated with the PRACH transmission, an RO corresponding to the SSB indicated by the PDCCH; Determine, according to the RO set configured by the network side device, a first RO set where an RO corresponding to the SSB indicated by the PDCCH is located; Determine M-1 ROs from the first RO set, and use one RO corresponding to the SSB indicated by the PDCCH and the M-1 ROs as RO resources corresponding to the M times of PRACH repeated transmission. 25. The PRACH repeated transmission device according to claim 20, characterized in that the performing physical random access channel PRACH repeated transmission according to the PDCCH comprises: Determine, according to the indication of the second bit field, a second RO set from multiple RO sets configured by the network side device; A plurality of ROs in the second RO set are used as the RO resources. 26. The PRACH repeated transmission device according to claim 25, characterized in that the second bit field is a code point in the PRACH mask index information field. 27. The PRACH repeated transmission device according to claim 20, characterized in that the performing physical random access channel PRACH repeated transmission according to the PDCCH comprises: Determining the RO resource according to the target parameter indicated by the PDCCH; The target parameter includes one of the following: The frequency resource position corresponding to the RO resource; The remainder of the RO index value corresponding to the RO resource. 28. The PRACH repeated transmission device according to claim 27, characterized in that the determining of the RO resource according to the target parameter indicated by the PDCCH comprises one of the following: Determine, according to the frequency resource position corresponding to the RO resource, N ROs with the same frequency resource position, and use the N ROs with the same frequency resource position as RO resources for repeated transmission of the PRACH; Determine N RO index values according to the remainder of the RO index value corresponding to the RO resource, and use the N ROs corresponding to the N RO index values as RO resources for repeated transmission of the PRACH; Wherein, N is a positive integer. 29. A PRACH repeated transmission device, comprising: A first sending unit, configured to send a physical downlink control channel PDCCH to a terminal; The PDCCH includes at least one of the following: First indication information used to instruct the terminal to perform PRACH repeated transmission; Second indication information used to determine random access transmission opportunity RO resources; The random access transmission opportunity RO resource is used for repeated transmission of the PRACH. 30. The PRACH repeated transmission device according to claim 29, wherein the first indication information comprises at least one of the following: An index value of a PRACH transmission, wherein the index value of the PRACH transmission is configured as a preamble index value for performing repeated transmission of the PRACH; an uplink UL/supplementary uplink SUL indication field, wherein the UL/SUL indication field is interpreted by the terminal as indicating repeated transmission of the PRACH; One or more code points in the PRACH mask index information field, the code points being used to indicate repeated transmission of the PRACH; The first bit field is used to indicate repeated transmission of the PRACH. 31. The PRACH repeated transmission device according to claim 29 or 30, characterized in that the second indication information includes at least one of the following: Synchronization signal block SSB index value and RO index value associated with PRACH transmission; A second bit field, where the second bit field is used to indicate an RO set corresponding to the RO resource; A target parameter, where the target parameter is used to indicate a parameter for determining the RO resource. 32. The PRACH repeated transmission device according to claim 31, further comprising: The second sending unit is used to send at least one RO set information to the terminal, where the RO set information is used to indicate the RO set where the RO resources available for PRACH repeated transmission by the terminal are located. 33. A terminal, characterized in that it comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein when the program or instruction is executed by the processor, the steps of the PRACH repeated transmission method as described in any one of claims 1 to 11 are implemented. 34. A network side device, characterized in that it comprises a processor, a memory, and a program or instruction stored in the memory and executable on the processor, wherein when the program or instruction is executed by the processor, the steps of the PRACH repeated transmission method as described in any one of claims 12 to 17 are implemented. 35. A readable storage medium, characterized in that a program or instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, it implements the PRACH repeated transmission method as described in any one of claims 1 to 11, or implements the steps of the PRACH repeated transmission method as described in any one of claims 12 to 17.

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