WO2022079861A1

WO2022079861A1 - Terminal

Info

Publication number: WO2022079861A1
Application number: PCT/JP2020/038957
Authority: WO
Inventors: 大輔栗田; 浩樹原田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2020-10-15
Filing date: 2020-10-15
Publication date: 2022-04-21
Also published as: JPWO2022079861A1

Abstract

UE assumes that a physical downlink data channel is repeated in the frequency direction in the same time domain.

Description

Terminal

This disclosure relates to a terminal that receives a physical downlink data channel.

The 3rd Generation Partnership Project (3GPP) specifies the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and next-generation specifications called Beyond 5G, 5G Evolution or 6G. We are also proceeding with the conversion.

For example, in 3GPP Release-17, it has been agreed to consider coverage enhancement (CE: Coverage Enhancement) in NR (Non-Patent Document 1).

Link budget (Hardware link) of physical channels (PDSCH (Physical Downlink Shared Channel), PUSCH (Physical Uplink Shared Channel), PDCCH (Physical Downlink Control Channel) and PUCCH (Physical Uplink Control Channel)) toward the realization of coverage expansion in NR. As a result of evaluating the budget), it has been found that there is room for improvement at least for PDSCH (physical downlink data channel).

Regarding the downlink (DL) transmission power of a radio base station (gNB), the power density (PSD: Power Spectrum Density) is generally constant regardless of the bandwidth of the transmission signal, so the resource block allocated to the resource to be transmitted. (RB) The larger the number, the larger the total transmission power.

In NR, PDSCH time / frequency resources can be flexibly allocated. For example, it is possible to increase the total transmission power by increasing the number of RBs and decreasing the coding rate.

The coding rate is determined for each Modulation and Coding Scheme (MCS) index, and the transport block (TB) size is determined by the MCS and the amount of allocated resources. Therefore, even if the amount of allocated resources is increased, the code rate does not fall below MCS = 0. Furthermore, if the amount of allocated resources is increased in order to increase the total transmission power, the TB size will increase, and if you want to send data of a small size, resources will be wasted.

Therefore, it is desirable to utilize the allocated resources so that small size data can be transmitted with a lower error rate.

Therefore, the following disclosure was made in view of such a situation, and aims to provide a terminal capable of more efficient PDSCH reception corresponding to the coverage expansion.

One aspect of the present disclosure is a control unit that assumes that a receiving unit (radio signal transmission / reception unit 210) that receives a physical downlink data channel and the physical downlink data channel are repeated in the frequency direction within the same time domain. It is a terminal (UE200) provided with (control unit 270).

FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10. FIG. 2 is a diagram showing a configuration example of a wireless frame, a subframe, and a slot used in the wireless communication system 10. FIG. 3 is a functional block configuration diagram of the UE 200. FIG. 4 is a diagram showing the MIL evaluation result of the physical channel in FR1. FIG. 5 is a diagram showing the MIL evaluation result of the physical channel in FR2. FIG. 6 is a diagram showing an example of the relationship between the bandwidth of the transmission signal and the power density (PSD). FIG. 7 is a diagram showing an example (continuous arrangement) of PDSCH resource allocation according to the operation example 1. FIG. 8 is a diagram showing an example of PDSCH resource allocation (discontinuous arrangement) according to operation example 1. FIG. 9 is a diagram showing an example of a communication sequence related to the Repetition setting in the frequency direction of PDSCH. FIG. 10 is a diagram showing a configuration example of PDSCH-Config. FIG. 11 is a diagram showing an example of the hardware configuration of the UE 200.

Hereinafter, embodiments will be described based on the drawings. The same functions and configurations are designated by the same or similar reference numerals, and the description thereof will be omitted as appropriate.

(1) Overall Schematic Configuration of Wireless Communication System FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10 according to the present embodiment. The wireless communication system 10 is a wireless communication system according to 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN20, and a terminal 200 (hereinafter, UE200).

The wireless communication system 10 may be a wireless communication system according to a method called Beyond 5G, 5G Evolution, or 6G.

NG-RAN20 includes a radio base station 100A (hereinafter, gNB100A) and a radio base station 100B (hereinafter, gNB100B). The specific configuration of the wireless communication system 10 including the number of gNBs and UEs is not limited to the example shown in FIG.

The NG-RAN20 actually contains multiple NG-RANNodes, specifically gNB, and is connected to a core network (5GC, not shown) according to 5G. In addition, NG-RAN20 and 5GC may be simply expressed as "network".

GNB100A and gNB100B are radio base stations according to NR, and execute wireless communication according to UE200 and NR. gNB100A, gNB100B and UE200 are Massive MIMO that generates a beam with higher directivity by controlling radio signals transmitted from multiple antenna elements, and carrier aggregation (CA) that uses multiple component carriers (CC) in a bundle. ), And dual connectivity (DC) that communicates between the UE and multiple NG-RAN Nodes at the same time.

The wireless communication system 10 corresponds to FR1 and FR2. The frequency bands of each FR are as follows.

・ FR1: 410 MHz to 7.125 GHz
・ FR2: 24.25 GHz to 52.6 GHz
FR1 uses a Sub-Carrier Spacing (SCS) of 15, 30 or 60 kHz and may use a bandwidth (BW) of 5-100 MHz. FR2 has a higher frequency than FR1, and SCS of 60 or 120 kHz (240 kHz may be included) is used, and a bandwidth (BW) of 50 to 400 MHz may be used.

Further, the wireless communication system 10 may support a higher frequency band than the frequency band of FR2. Specifically, the wireless communication system 10 can support a frequency band exceeding 52.6 GHz and up to 114.25 GHz.

Further, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform-Spread (DFT-S-OFDM) having a larger Sub-Carrier Spacing (SCS) may be applied. Further, DFT-S-OFDM may be applied not only to the uplink (UL) but also to the downlink (DL).

FIG. 2 shows a configuration example of a wireless frame, a subframe, and a slot used in the wireless communication system 10.

As shown in FIG. 2, one slot is composed of 14 symbols, and the larger (wider) the SCS, the shorter the symbol period (and slot period). The number of symbols constituting one slot does not necessarily have to be 14 symbols (for example, 28, 56 symbols). Further, the number of slots per subframe may differ depending on the SCS. Further, although not shown, the SCS may use a wider interval, for example, 480 kHz, 960 kHz, or the like.

The time direction (t) shown in FIG. 2 may be referred to as a time domain, a symbol period, a symbol time, or the like. Further, the frequency direction may be referred to as a frequency domain, a resource block, a subcarrier, a BWP (Bandwidth part), or the like.

In addition, the wireless communication system 10 can support coverage enhancement (CE: Coverage Enhancement) that expands the coverage of cells formed by gNB100A (and gNB100B, the same applies hereinafter). Coverage extension may provide a mechanism for increasing the reception success rate of various physical channels.

In the present embodiment, the wireless communication system 10 (gNB100A) can support repeated transmission of a physical downlink data channel, specifically, a PDSCH (Physical Downlink Shared Channel).

(2) Functional block configuration of the wireless communication system Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configuration of UE200 will be described.

FIG. 3 is a functional block configuration diagram of UE200. As shown in FIG. 3, the UE 200 includes a radio signal transmission / reception unit 210, an amplifier unit 220, a modulation / demodulation unit 230, a control signal / reference signal processing unit 240, a coding / decoding unit 250, a data transmission / reception unit 260, and a control unit 270. ..

The radio signal transmission / reception unit 210 transmits / receives a radio signal according to NR. The wireless signal transmission / reception unit 210 corresponds to Massive MIMO, a CA that bundles a plurality of CCs, and a DC that simultaneously communicates between a UE and each of two NG-RAN Nodes.

Specifically, the wireless signal transmission / reception unit 210 transmits / receives a wireless signal via various physical channels. In particular, in the present embodiment, the radio signal transmission / reception unit 210 constitutes a reception unit that receives the physical downlink data channel. Specifically, the physical downlink data channel may be interpreted as PDSCH (Physical Downlink Shared Channel). PDSCH may be referred to as a physical downlink shared channel.

Further, the radio signal transmission / reception unit 210 constitutes a transmission unit that transmits the capability information of the UE 200 regarding the reception of the physical downlink data channel to the network.

Specifically, the radio signal transmission / reception unit 210 can transmit capacity information indicating the ability to respond to repetition in the frequency direction of PDSCH (physical downlink data channel) to the network. The capability information of UE200 may be interpreted as UE capability information specified in 3GPP TS38.331 or the like.

The wireless signal transmission / reception unit 210 can transmit UE capability information via a predetermined uplink physical channel. The contents of UE capability information regarding PDSCH reception will be described later.

The amplifier unit 220 is composed of PA (Power Amplifier) / LNA (Low Noise Amplifier) and the like. The amplifier unit 220 amplifies the signal output from the modulation / demodulation unit 230 to a predetermined power level. Further, the amplifier unit 220 amplifies the RF signal output from the radio signal transmission / reception unit 210.

The modulation / demodulation unit 230 executes data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (gNB100A, etc.). Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform-Spread (DFT-S-OFDM) may be applied to the modulation / demodulation unit 230. Further, the DFT-S-OFDM may be used not only for the uplink (UL) but also for the downlink (DL).

The control signal / reference signal processing unit 240 executes processing related to various control signals transmitted / received by the UE 200 and processing related to various reference signals transmitted / received by the UE 200.

Specifically, the control signal / reference signal processing unit 240 controls various control signals transmitted from the gNB100A (or gNB100B, the same applies hereinafter) via a predetermined control channel, for example, a radio resource control layer (RRC). Receive a signal. Further, the control signal / reference signal processing unit 240 transmits various control signals to the gNB100A via a predetermined control channel.

The control signal / reference signal processing unit 240 executes processing using a reference signal (RS) such as Demodulation Reference Signal (DMRS) and Phase Tracking Reference Signal (PTRS).

DMRS is a reference signal (pilot signal) known between the base station and the terminal of each terminal for estimating the fading channel used for data demodulation. PTRS is a terminal-specific reference signal for the purpose of estimating phase noise, which is a problem in high frequency bands.

In addition to DMRS and PTRS, the reference signal may include ChannelStateInformation-ReferenceSignal (CSI-RS), SoundingReferenceSignal (SRS), and PositioningReferenceSignal (PRS) for location information.

Channels include control channels and data channels. Control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel, Random Access Radio Network Temporary Identifier (RA-RNTI), Downlink Control Information (DCI)), and Physical. Broadcast Channel (PBCH) etc. are included.

Data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel). Data may mean data transmitted over a data channel.

Further, the physical channel may include at least PDCCH, PUCCH, PUSCH and PDSCH.

The coding / decoding unit 250 executes data division / concatenation and channel coding / decoding for each predetermined communication destination (gNB100A, etc.).

Specifically, the coding / decoding unit 250 divides the data output from the data transmission / reception unit 260 into predetermined sizes, and executes channel coding for the divided data. Further, the coding / decoding unit 250 decodes the data output from the modulation / demodulation unit 230 and concatenates the decoded data.

The data transmission / reception unit 260 executes transmission / reception of Protocol Data Unit (PDU) and Service Data Unit (SDU). Specifically, the data transmitter / receiver 260 is a PDU / SDU in a plurality of layers (such as a medium access control layer (MAC), a radio link control layer (RLC), and a packet data convergence protocol layer (PDCP)). Assemble / disassemble the. Further, the data transmission / reception unit 260 executes data error correction and retransmission control based on the hybrid ARQ (Hybrid automatic repeat request).

The control unit 270 controls each functional block constituting the UE 200. In particular, in the present embodiment, the control unit 270 can execute various controls related to the physical channel in order to support the coverage expansion (CE).

Specifically, the control unit 270 may assume that PDSCH (physical downlink data channel) is repeated in the frequency direction. Repeating PDSCHs in the frequency direction means that multiple PDSCHs allocated to a certain area (resources such as symbols or slots) in the time direction are allocated in the area in the time direction also in the frequency direction. good.

That is, the control unit 270 may assume that the PDSCH is repeated in the frequency direction within the same time domain.

PDSCHs (which may be called PDSCH resources) that are repeated in the frequency direction may be adjacent in the frequency direction or may be separated so as to be provided with a certain interval. That is, a plurality of PDSCHs may be continuously assigned to adjacent subcarriers, or may be assigned to several subcarriers at intervals.

As described above, the control unit 270 may assume that the PDSCH is repeated at intervals in the frequency direction, or that the PDSCH is continuously repeated in the frequency direction.

The control unit 270 may change at least one of the modulation coding scheme (MCS: Modulation and Coding Scheme) and the coding rate (coding rate) based on the repetition in the frequency direction of the PDSCH.

For example, in the control unit 270, when the number of repetitions of PDSCH (referred to as the number of repetitions) is 4 (that is, 4 PDSCHs are repeated), the coding rate may be 1/4 of the case where there is no repetition. Further, the control unit 270 may also change the MCS according to the number of repetitions or the presence or absence of repetitions. For example, if the number of PDSCH iterations is 2, an MCS 3 less than the indicated MCS may be set.

The control unit 270 may assume the repetition (Repetition) in the frequency direction of PDSCH as described above based on the signaling from the network. Specifically, the control unit 270 is in the frequency direction of the PDSCH based on the signaling of the downlink control information (DCI), the control element of the medium access control layer (MAC-CE), or the radio resource control layer (RRC). You may assume repetition.

The DCI, MAC-CE or RRC signaling may include information indicating the presence or absence of repetition in the frequency direction of PDSCH, the number of repetitions, and the interval of repetitions. A specific example of the signaling will be further described later.

(3) Operation of wireless communication system Next, the operation of the wireless communication system 10 will be described. Specifically, the operation related to the reception of the physical downlink data channel (PDSCH) corresponding to the coverage extension (CE) will be described.

(3.1) Assumption In the Study Item (see RP-193240) set by 3GPP, it is assumed that coverage will be expanded in both the FR1 and FR2 frequency bands.

Target scenarios include service provision from outdoor (O) gNB to indoor (I) UE (in the case of FR1) and service provision from indoor gNB to indoor UE (in the case of FR2). In addition, coverage expansion (including rural areas for long-distance communication) in urban areas, suburbs and rural areas (countryside) is targeted.

The main target services are VoIP (Voice over IP) and eMBB (enhanced Mobile Broadband).

Based on such scenarios and target services, evaluate the link budget (Hardware link budget, MIL) specified in 3GPP for physical channels, specifically PDSCH, PUSCH, PDCCH, and PUCCH. As a result, it is assumed that there is a need for improvement as shown below.

(FR1)
・ PUSCH: Approximately 13 dB (eMBB)
・ PDSCH: Approximately 5 to 6 dB (VoIP and eMBB)
・ PDCCH: Approximately 5 dB (VoIP)
(FR2)
・ PUSCH: Approximately 21 dB (eMBB)
・ PDSCH: Approximately 16 dB (VoIP), Approximately 8 dB (eMBB)
・ PDCCH: Approximately 18 dB (VoIP)
FIG. 4 shows the MIL evaluation result of the physical channel in FR1. FIG. 5 shows the MIL evaluation result of the physical channel in FR2.

The following describes the operation related to the improvement of PDSCH to support coverage expansion.

FIG. 6 shows an example of the relationship between the bandwidth of the transmission signal and the power density (PSD). As shown in FIG. 6, regarding the downlink (DL) transmission power of gNB100A (and gNB100B, the same applies hereinafter), the power density (PSD: Power Spectrum Density) is generally constant regardless of the bandwidth of the transmission signal. , The larger the number of resource blocks (RBs) allocated to the resource to be transmitted, the larger the total transmission power.

In order to utilize the allocated resources and send small size data with a lower error rate, the following methods can be considered.

(I) Introduce a new MCS table with a lower code rate (ii) Determine the transport block (TB) size from the amount of (partial) resources allocated and the remaining resources in the frequency direction Repeat transmission (repetition)

(3.2) Outline of operation The following describes an operation example when the method (ii) described above is applied to PDSCH. As a result, coverage can be expanded by introducing Repetition in the frequency direction of PDSCH.

Specifically, the wireless communication system 10 can execute the following operations.

-(Operation example 1): Repetition in the frequency direction of PDSCH
-The PDSCH resource set by DCI is repeatedly set in the frequency direction.-The number of repetitions may be set arbitrarily.-The MCS and / or the coding rate may be changed according to the number of repetitions.-Repetition interval. May be set arbitrarily ・ (Operation example 2) :: How to set Repetition in the frequency direction of PDSCH ・ Notify by DCI (For example, specify a new DCI format and specify Frequency Domain Resource Assignment (FDRA) or notification. -Extend the fields to be used-Notify by MAC-CE-Set by RRC signaling (for example, set using PDSCH-Config)
-(Operation example 3): UE capability information
The UE (terminal) reports, for example, the ability to support the following repetitions in the frequency direction of PDSCH: ・ Repetition support in the frequency direction of PDSCH ・ Number of repetitions in the frequency direction of PDSCH, Repetition interval

(3.3) Operation example 1
In this operation example, repetition in the frequency direction is executed in order to obtain the frequency diversity gain of PDSCH.

FIG. 7 shows an example of PDSCH resource allocation (continuous allocation) according to operation example 1. FIG. 8 shows an example (discontinuous arrangement) of PDSCH resource allocation according to the operation example 1. 7 and 8 show an example in which the number of repetitions is 4.

As shown in FIGS. 7 and 8, in this operation example, the PDSCH resource set by DCI can be repeatedly set in the frequency direction. That is, PDSCH resources may be repeatedly allocated in the frequency direction.

The number of repetitions is not limited to 4, and any number (for example, Number of Repetition = 2, 4, 8, 16) may be set.

Further, at least one of the MCS and the coding rate may be changed according to the number of repetitions. For example, when the number of repetitions = 4, the coding rate may be 1/4 of the case where there is no repetition. In other words, the coding rate may be lowered as the number of repetitions increases.

Also, as shown in FIGS. 7 (continuous arrangement) and 8 (non-continuous arrangement), the Repetitioned PDSCH resources may be continuously set (allocated) in the frequency direction or at regular intervals. It may be set (allocated) with a (gap).

UE200 may assume such Repetition in the frequency direction of PDSCH in advance. Specifically, the Repetition may be assumed in advance based on the setting method described below.

(3.4) Operation example 2
FIG. 9 shows an example of a communication sequence related to the Repetition setting in the PDSCH frequency direction.

As shown in FIG. 9, the UE200 may transmit the capability information (UEcapability information) indicating the capability of the UE200 regarding Repetition in the frequency direction of the PDSCH to the network (S10).

The UE capability information may include whether or not Repetition is supported in the frequency direction of PDSCH, the number of Repetitions that can be supported, and the Repetition interval. The UE capability information may include only one of these elements (for example, whether or not Repetition is supported). Further, a specific example of the UE capability information will be further described in Operation Example 3.

The network determines PDSCH resources based on the received UE capability information and the capabilities of the network side (S20). Specifically, the network may determine the presence or absence of repetition, the number of repetitions, and the repetition interval in the frequency direction of PDSCH.

The network notifies UE200 of the determined PDSCH resource information (S30). Specifically, as described above, the information may be notified by DCI, MAC-CE or RRC signaling.

UE200 sets PDSCH reception based on the notified PDSCH resource information (S40). Specifically, the UE 200 may execute the setting regarding Repetition in the frequency direction of PDSCH based on the information of the notified PDSCH resource.

As mentioned above, the network may notify the determined PDSCH resource information by DCI, MAC-CE or RRC signaling, but specifically, it can be notified as follows.

For example, when notifying by DCI, a new DCI format may be specified, and the presence / absence of Repetition and / or the number of Repetitions may be set at the time of scheduling PDSCH.

Also, in this case, by extending the FDRA, the start position of the existing allocated resource, the number of RBs and / or the resource block group (RBG), as well as the number and / or intervals of repetitions are notified by joint coding. May be good.

Alternatively, a new field for notifying the number of repetitions and / or the interval may be provided in the existing DCI format.

When notifying by MAC-CE, a new MAC-CE separate from the existing MAC-CE may be used.

When notifying by RRC signaling, that is, RRC parameters, for example, the information element of PDSCH-Config may be used. FIG. 10 shows a configuration example of PDSCH-Config.

As shown in FIG. 10, the number of Repetitions in the frequency direction of PDSCH (for example, ENUMERATED (n2, n4, n8, n16)) may be notified using the field of pdsch-Repetition_FrequencyDomain. Alternatively, an arbitrary value (for example, INTEGER (0 ... 20)) may be set.

Further, the Repetition interval may be the same as the number of RBs (assigned) set in PDSCH, or may be an arbitrary value. In the case of an arbitrary value, as shown in FIG. 10, the Repetition interval may be notified using the field of Repetition_offset.

(3.5) Operation example 3
The UE 200 capability information regarding Repetition in the frequency direction of PDSCH may include the following elements.

-Whether or not Repetition is supported in the PDSCH frequency direction-Number of Repetitions and / or Repetition intervals in the PDSCH frequency direction The UE200 may report at least one of the following with respect to the corresponding frequency.

・ Whether or not all frequencies can be handled collectively (whether or not it can be supported as a UE)
-Availability for each frequency (band) -Availability for each frequency range (FR1, FR2) Furthermore, the UE200 may report at least one of the following regarding the corresponding duplex method.

-Whether or not it is possible to support the recovery method as a UE-Whether or not it is possible to support each duplex method (TDD, FDD)

(4) Action / Effect According to the above-described embodiment, the following action / effect can be obtained. Specifically, the UE 200 can assume that the PDSCH is repeated in the frequency direction within the same time domain. Therefore, the UE200 can easily obtain the frequency diversity gain of PDSCH.

In addition, the TB size can be determined from the amount of (partial) resources allocated to PDSCH, and the remaining resources can be allocated to Repetition in the frequency direction. It is easy to realize transmission with a lower error rate.

That is, according to the wireless communication system 10, the UE 200 can support more efficient reception of PDSCH corresponding to the coverage expansion, and can realize a higher quality coverage expansion.

In the present embodiment, it can be assumed that the PDSCH is repeated at intervals in the frequency direction in the UE200. Therefore, the UE200 can further obtain the frequency diversity gain of PDSCH, and can realize higher quality coverage expansion.

In this embodiment, the UE 200 can change at least either the MCS or the coding rate based on the repetition in the frequency direction of the PDSCH. Therefore, it is possible to realize efficient data transmission according to the amount of resources allocated to PDSCH.

In this embodiment, UE200 can assume Repetition in the frequency direction of PDSCH based on DCI, MAC-CE or RRC signaling. Therefore, the UE 200 can surely recognize the setting of Repetition in the frequency direction of PDSCH in advance.

In this embodiment, the UE200 can transmit UE capability information indicating the ability to respond to Repetition in the frequency direction of PDSCH to the network. Therefore, the network can set an appropriate PDSCH according to the capability of the UE200.

(5) Other Embodiments Although the embodiments have been described above, it is obvious to those skilled in the art that various modifications and improvements are possible without limitation to the description of the embodiments.

For example, in the above-described embodiment, PDSCH has been described as an example, but PDSCH may be referred to by another name. Specifically, if it is a data channel in the downlink (DL) direction, it may be called by a name different from PDSCH.

Further, in the above-described embodiment, it has been described that the UE 200 assumes Repetition in the frequency direction of PDSCH based on DCI, but when the presence or absence of the Repetition is notified by MAC-CE or RRC signaling. Does not have to be based on the DCI for receiving PDSCH (for example, Format1_1) for the assumption of the Repetition.

Further, the block configuration diagram (FIG. 3) used in the description of the above-described embodiment shows a block of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or two or more physically or logically separated devices can be directly or indirectly (eg, for example). , Wired, wireless, etc.) and may be realized using these plurality of devices. The functional block may be realized by combining the software with the one device or the plurality of devices.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but limited to these I can't. For example, a functional block (configuration unit) that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter). In each case, as described above, the realization method is not particularly limited.

Further, the UE 200 described above may function as a computer that processes the wireless communication method of the present disclosure. FIG. 11 is a diagram showing an example of the hardware configuration of the UE 200. As shown in FIG. 11, the UE 200 may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In the following explanation, the word "device" can be read as a circuit, device, unit, etc. The hardware configuration of the device may be configured to include one or more of each of the devices shown in the figure, or may be configured not to include some of the devices.

Each functional block of UE200 (see FIG. 3) is realized by any hardware element of the computer device or a combination of the hardware elements.

In addition, each function in the UE 200 is such that the processor 1001 performs an operation by loading predetermined software (program) on the hardware such as the processor 1001 and the memory 1002, and controls the communication by the communication device 1004, or the memory 1002. And by controlling at least one of reading and writing of data in the storage 1003.

Processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.

Further, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. Further, the various processes described above may be executed by one processor 1001 or may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and is composed of at least one such as ReadOnlyMemory (ROM), ErasableProgrammableROM (EPROM), Electrically ErasableProgrammableROM (EEPROM), and RandomAccessMemory (RAM). May be done. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can execute the method according to the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, for example, an optical disk such as Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, or a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. Storage 1003 may be referred to as auxiliary storage. The recording medium described above may be, for example, a database, server or other suitable medium containing at least one of the memory 1002 and the storage 1003.

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.

The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

In addition, each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information. Bus 1007 may be configured using a single bus or may be configured using different buses for each device.

Furthermore, the device includes hardware such as a microprocessor, a digital signal processor (Digital Signal Processor: DSP), ApplicationSpecific IntegratedCircuit (ASIC), ProgrammableLogicDevice (PLD), and FieldProgrammableGateArray (FPGA). The hardware may implement some or all of each functional block. For example, processor 1001 may be implemented using at least one of these hardware.

Further, the notification of information is not limited to the embodiment / embodiment described in the present disclosure, and may be performed by using another method. For example, information notification includes physical layer signaling (eg Downlink Control Information (DCI), Uplink Control Information (UCI), higher layer signaling (eg RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block)). (MIB), System Information Block (SIB)), other signals or combinations thereof. RRC signaling may also be referred to as an RRC message, eg, RRC Connection Setup. ) Message, RRC Connection Reconfiguration message, etc. may be used.

Each aspect / embodiment described in the present disclosure includes LongTermEvolution (LTE), LTE-Advanced (LTE-A), SUPER3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system ( 5G), FutureRadioAccess (FRA), NewRadio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UltraMobileBroadband (UMB), IEEE802.11 (Wi-Fi (registered trademark)) , IEEE802.16 (WiMAX®), IEEE802.20, Ultra-WideBand (UWB), Bluetooth®, and other systems that utilize appropriate systems and at least one of the next-generation systems extended based on them. It may be applied to one. In addition, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

In some cases, the specific operation performed by the base station in this disclosure may be performed by its upper node (upper node). In a network consisting of one or more network nodes having a base station, various operations performed for communication with the terminal are the base station and other network nodes other than the base station (eg, MME or). It is clear that it can be done by at least one of (but not limited to, S-GW, etc.). Although the case where there is one network node other than the base station is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Information and signals (information, etc.) can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

The input / output information may be stored in a specific location (for example, memory) or may be managed using a management table. I / O information can be overwritten, updated, or added. The output information may be deleted. The entered information may be transmitted to other devices.

The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or may be switched and used according to the execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.

Software, whether called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

Further, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, a website, where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.). When transmitted from a server or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

The terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, the signal may be a message. Further, the component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably.

Further, the information, parameters, etc. described in the present disclosure may be expressed using an absolute value, a relative value from a predetermined value, or another corresponding information. It may be represented. For example, the radio resource may be indexed.

The names used for the above parameters are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those expressly disclosed in this disclosure. Since various channels (eg, PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in any respect limited names. is not.

In this disclosure, "Base Station (BS)", "Wireless Base Station", "Fixed Station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", " "Access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", " Terms such as "carrier" and "component carrier" may be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

A base station can accommodate one or more (eg, three) cells (also called sectors). When a base station accommodates multiple cells, the entire base station coverage area can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio). Communication services can also be provided by Head: RRH).

The term "cell" or "sector" refers to a base station that provides communication services in this coverage, and part or all of the coverage area of at least one of the base station subsystems.

In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "user equipment (UE)", and "terminal" may be used interchangeably. ..

Mobile stations can be used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, a mobile body itself, or the like. The moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of a base station and a mobile station may be an Internet of Things (IoT) device such as a sensor.

Further, the base station in the present disclosure may be read as a mobile station (user terminal, the same shall apply hereinafter). For example, communication between a base station and a mobile station has been replaced with communication between a plurality of mobile stations (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the mobile station may have the functions of the base station. Further, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, the upstream channel, the downstream channel, and the like may be read as a side channel.

Similarly, the mobile station in the present disclosure may be read as a base station. In this case, the base station may have the functions of the mobile station.
The radio frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe. Subframes may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.

The numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel. Numerology includes, for example, SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval: TTI), number of symbols per TTI, wireless frame configuration, transmission / reception. It may indicate at least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like.

The slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time area. The slot may be a unit of time based on numerology.

The slot may include a plurality of mini slots. Each minislot may be composed of one or more symbols in the time domain. Further, the mini-slot may be referred to as a sub-slot. A minislot may consist of a smaller number of symbols than the slot. PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (or PUSCH) mapping type B.

The wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal. The radio frame, subframe, slot, minislot and symbol may use different names corresponding to each.

For example, one subframe may be referred to as a transmission time interval (TTI), a plurality of consecutive subframes may be referred to as TTI, and one slot or one minislot may be referred to as TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (eg, 1-13 symbols), or a period longer than 1ms. May be. The unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.

Here, TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in an LTE system, a base station schedules each user terminal to allocate wireless resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units. The definition of TTI is not limited to this.

TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation. When a TTI is given, the time interval (for example, the number of symbols) to which the transport block, code block, code word, etc. are actually mapped may be shorter than the TTI.

When one slot or one mini slot is called TTI, one or more TTIs (that is, one or more slots or one or more mini slots) may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

TTI with a time length of 1 ms may be called normal TTI (TTI in LTE Rel.8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.

The long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) may be read as a TTI less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.

The resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain. The number of subcarriers contained in RB may be the same regardless of numerology, and may be, for example, 12. The number of subcarriers contained in the RB may be determined based on numerology.

Further, the time domain of RB may include one or more symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.

One or more RBs are physical resource blocks (Physical RB: PRB), sub-carrier groups (Sub-Carrier Group: SCG), resource element groups (Resource Element Group: REG), PRB pairs, RB pairs, etc. May be called.

Further, the resource block may be composed of one or a plurality of resource elements (ResourceElement: RE). For example, 1RE may be a radio resource area of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (which may also be called partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. good. Here, the common RB may be specified by the index of the RB with respect to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP). One or more BWPs may be set in one carrier for the UE.

At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP. In addition, "cell", "carrier" and the like in this disclosure may be read as "BWP".

The above-mentioned structures such as wireless frames, subframes, slots, mini slots and symbols are merely examples. For example, the number of subframes contained in a radio frame, the number of slots per subframe or radioframe, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in RB. The number of subcarriers, as well as the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or connection between two or more elements and each other. It can include the presence of one or more intermediate elements between two "connected" or "joined" elements. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in the present disclosure, the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain. Can be considered to be "connected" or "coupled" to each other using electromagnetic energy having wavelengths in the microwave and light (both visible and invisible) regions.

The reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot (Pilot) depending on the applied standard.

The statement "based on" used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

The "means" in the configuration of each of the above devices may be replaced with a "part", a "circuit", a "device", or the like.

Any reference to elements using designations such as "first" and "second" as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Therefore, references to the first and second elements do not mean that only two elements can be adopted there, or that the first element must somehow precede the second element.

When "include", "including" and variations thereof are used in the present disclosure, these terms are as inclusive as the term "comprising". Is intended. Moreover, the term "or" used in the present disclosure is intended to be non-exclusive.

In the present disclosure, if articles are added by translation, for example, a, an and the in English, the disclosure may include the plural nouns following these articles.

The terms "determining" and "determining" used in this disclosure may include a wide variety of actions. "Judgment" and "decision" are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). It may include (eg, searching in a table, database or another data structure), ascertaining as "judgment" or "decision". Also, "judgment" and "decision" are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. It may include (for example, accessing data in memory) to be regarded as "judgment" or "decision". In addition, "judgment" and "decision" are considered to be "judgment" and "decision" when the things such as solving, selecting, choosing, establishing, and comparing are regarded as "judgment" and "decision". Can include. That is, "judgment" and "decision" may include considering some action as "judgment" and "decision". Further, "judgment (decision)" may be read as "assuming", "expecting", "considering" and the like.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". The term may mean that "A and B are different from C". Terms such as "separate" and "combined" may be interpreted in the same way as "different".

Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure may be implemented as amendments and modifications without departing from the spirit and scope of the present disclosure as determined by the description of the scope of claims. Therefore, the description of this disclosure is for purposes of illustration and does not have any limiting meaning to this disclosure.

10 Wireless communication system 20 NG-RAN
100A, 100B gNB
UE 200
210 Wireless signal transmitter / receiver 220 Amplifier 230 Modulator / demodulator 240 Control signal / reference signal processing 250 Encoding / decoding 260 Data transmitter / receiver 270 Control 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

Claims

A receiver that receives physical downlink data channels,
A terminal including a control unit that assumes that the physical downlink data channel is repeated in the frequency direction within the same time domain.
The terminal according to claim 1, wherein the control unit assumes that the physical downlink data channels are repeated at intervals in the frequency direction.
The terminal according to claim 1, wherein the control unit changes at least one of a modulation coding scheme and a coding rate based on repetition in the frequency direction of the physical downlink data channel.
The terminal according to claim 1, wherein the control unit assumes repetition in the frequency direction of the physical downlink data channel based on downlink control information, a control element of a medium access control layer, or signaling of a radio resource control layer.
The terminal according to claim 1, further comprising a transmission unit that transmits capacity information indicating the ability of the physical downlink data channel to respond to repetition in the frequency direction.