Terminal, sidelink communication control method, communication method, and integrated circuit

Abstract

To improve communication performance of sidelinks.SOLUTION: A terminal includes a circuit for generating information related to inter-terminal cooperative use of sidelink resources; and a transceiver for transmitting second sidelink control information including the information to another terminal. The second sidelink control information and third sidelink control information not including the information are transmitted on a data channel. The transceiver transmits first sidelink control information indicating one of the second sidelink control information and the third sidelink control information to the other terminal.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a terminal and a sidelink communication control method. [Background technology]

[0002] A communication system called the fifth-generation mobile communication system (5G) is currently under consideration. The 3rd Generation Partnership Project (3GPP), an international standardization organization, is studying the advancement of the 5G communication system from the perspectives of both the advancement of the LTE / LTE-Advanced system and New Radio Access Technology (also referred to as New RAT or NR), a new method that is not necessarily backward compatible with the LTE / LTE-Advanced system (see, for example, Non-Patent Document 1).

[0003] 3GPP has also been studying support for V2X (vehicle to X) in the LTE system. It is also considering supporting V2X in NR, which can use wider bandwidth. In addition to V2X, further expansion of communications using sidelink (SL) is also being considered. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TR 38.885 V16.0.0,Study on NR Vehicle-to-Everything (V2X)(Release 16),2019-03 [Non-patent document 2] RP-201385, “WID revision: NR sidelink enhancement”, LG Electronics, 3GPP TSG RAN Meeting #88e, Electronic Meeting, June 29 - July 3, 2020 Summary of the Invention [Problem to be solved by the invention]

[0005] However, there is room for further improvement in communication performance (for example, at least one of reliability, low latency, and reduced power consumption) in the sidelink.

[0006] Non-limiting examples of the present disclosure contribute to providing a terminal and a sidelink communication control method that can improve sidelink communication performance. [Means for solving the problem]

[0007] A terminal according to an embodiment of the present disclosure includes a control circuit for generating information related to cooperative use of side link resources between terminals, and a transmission circuit for transmitting the information to other terminals.

[0008] These comprehensive or specific aspects may be realized as a system, an apparatus, a method, an integrated circuit, a computer program, or a recording medium, or may be realized as any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium. [Effects of the Invention]

[0009] According to one embodiment of the present disclosure, the communication performance of the sidelink can be improved.

[0010] Further advantages and benefits of an embodiment of the present disclosure will become apparent from the specification and drawings. Such advantages and / or benefits may be provided by some of the embodiments and features described in the specification and drawings, respectively, but not necessarily all of them may be provided to obtain one or more identical features. [Brief explanation of the drawings]

[0011] [Figure 1] A diagram showing an example of channel allocation within a sidelink slot [Figure 2]Block diagram showing an example of the configuration of a part of a terminal [Figure 3] Block diagram showing an example of the configuration of a base station [Figure 4] Block diagram showing an example of a terminal configuration [Figure 5] Flowchart showing an example of the (transmission) operation of a terminal [Figure 6] Flowchart showing an example of the (receiving) operation of a terminal [Figure 7] Block diagram showing another example of the configuration of a terminal [Figure 8] FIG. 10 is a diagram showing an example of transmission of resource usage adjustment information 1. [Figure 9] FIG. 10 is a diagram showing another example of transmission of resource usage adjustment information 1. [Figure 10] FIG. 10 shows an example of transmission of resource usage adjustment information 3. [Figure 11] FIG. 10 shows an example of transmission of resource usage adjustment information 4. [Figure 12] PSSCH (physical SL shared channel) operation example 1 [Figure 13] FIG. 10 shows a modification of PSSCH operation example 1. [Figure 14] A diagram showing an example of setting up a new channel for resource utilization adjustment information. [Figure 15] 1st stage SCI (Sidelink Control Information) operation example 1 [Figure 16] 1st stage SCI operation example 2 [Figure 17] Diagram of an example architecture of a 3GPP NR system [Figure 18] Schematic diagram showing functional separation between NG-RAN and 5GC [Figure 19] Sequence diagram of the Radio Resource Control (RRC) connection setup / reconfiguration procedure [Figure 20]Schematic diagram showing usage scenarios for enhanced Mobile BroadBand (eMBB), massive Machine Type Communications (mMTC), and Ultra Reliable and Low Latency Communications (URLLC). [Figure 21] Block diagram illustrating an exemplary 5G system architecture for a non-roaming scenario DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0013] [Explanation of V2X] V2X is intended for vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P), and vehicle-to-network (V2N) communications. In V2V, V2I, and V2P, terminals can communicate directly (e.g., at least one of transmission and reception) using a link called a sidelink (SL) or PC5, without going through a network with a base station. In V2N, communication is expected to occur via a link called Uu between a base station (e.g., gNB in NR, eNB in LTE) and a terminal.

[0014] The resources used for the sidelink are configured, for example, by a SL BWP (Bandwidth Part) and a resource pool. The SL BWP specifies the frequency band available for the sidelink and may be configured separately from the DL BWP and UL BWP configured between the base station and the terminal (Uu). The frequency band may overlap with the UL BWP.

[0015] The resource pool includes, for example, resources in the frequency direction and the time direction specified in the resources in the SL BWP. Multiple resource pools may be configured for one terminal. The frequency resources in the resource pool may be divided into units called subchannels, for example, and resource allocation may be configured for each subchannel. A subchannel may include multiple PRBs (Physical Resource Blocks).

[0016] [Explanation of Sidelink in NR] In NR V2X, support for unicast, groupcast, and broadcast is being considered for sidelink communications (e.g., at least one of transmission and reception).

[0017] Unicast, for example, assumes one-to-one transmission from a transmitting terminal (also called transmitter UE or Tx UE) to a receiving terminal (for example, receiver UE or Rx UE). Groupcast, for example, assumes transmission from a transmitting terminal to multiple receiving terminals included in a certain group. Broadcast, for example, assumes transmission from a transmitting terminal without specifying a receiving terminal. UE is an abbreviation for User Equipment and is an example of a "terminal."

[0018] [SL channel explanation] In the NR SL, channel configurations such as a physical SL control channel (PSCCH), a physical SL shared channel (PSSCH), a physical SL feedback channel (PSFCH), and a physical SL broadcast channel (PSBCH) are considered.

[0019] The PSCCH is an example of a control channel in SL, and the PSSCH is an example of a data channel in SL. The PSFCH is an example of a channel used to transmit a feedback signal in SL, and the PSBCH is an example of a broadcast channel used for transmission that does not specify a receiving terminal. In the following description, the terms "signal" and "information" may be interpreted interchangeably depending on the context.

[0020] In the PSCCH, for example, a control signal (or control information) called sidelink control information (SCI) is arranged. The SCI includes information (or parameters) related to at least one of transmission and reception of the PSSCH, such as resource allocation information for a data signal (for example, the PSSCH).

[0021] As will be described later, the information content of the SCI may be divided (or classified or categorized) into, for example, first information (or control information) and second information (or control information). In other words, the SCI may include, for example, "first control information" and "second control information" related to the SL. The "second control information" may be considered as an example of information related to the "first control information." The "first control information" and "second control information" may be referred to, for example, as "1st stage SCI" and "2nd stage SCI," respectively.

[0022] The 1st stage SCI may be allocated to a PSCCH, which is an example of a SL control channel, and the 2nd stage SCI may be allocated to a PSSCH, which is an example of a SL data channel. In other words, the SCI may be allocated in a distributed manner to the PSCCH and the PSSCH. Note that the term "allocation" may be interchangeable with other appropriate terms used by those skilled in the art, such as "mapping," "allocation," or "(mapping) pattern" (the same applies hereinafter).

[0023] In the PSSCH, for example, a data signal, or a data signal and an SCI (for example, a second stage SCI) are allocated.

[0024] In the PSFCH, for example, a feedback signal (for example, hybrid automatic repeat request (HARQ) feedback) for the PSSCH (for example, a data signal) is arranged. The feedback signal may include, for example, a response signal indicating an ACK or NACK (for example, ACK / NACK information, also referred to as HARQ-ACK).

[0025] The feedback signal is assumed to be applied, for example, when the PSSCH is transmitted and received by unicast and groupcast. The ACK and NACK may be referred to as, for example, HARQ-ACK and HARQ-NACK, respectively.

[0026] For example, a broadcast signal that does not specify a receiving terminal is arranged in the PSBCH. The PSBCH is transmitted together with, for example, a sidelink primary synchronization signal (S-PSS) and a sidelink secondarily synchronization signal (S-SSS), which are synchronization signals, and is also collectively referred to as an S-SSB (sidelink synchronization signal block).

[0027] [SCI explanation] A non-limiting example of the information included in each of the 1st stage SCI and 2nd stage SCI is as follows:

[0028] <1st stage SCI> - Priority - 3 bits -Frequency resource assignment - Time resource assignment- 5 bits or 9 bits - Resource reservation period - [log2(N_(reservePeriod)] bits or 0 bits - DMRS pattern [x] bits or 0 bits - 2nd stage SCI format 2 bits - Beta_offset indicator 2 bits - Number of DMRS ports 1 bit - Modulation and coding scheme - 5 bits - Additional MCS table indicator - 2 bits or 0 bits - PSFCH overhead indication - 1bit - Reserved - [sl-NumReservedBits] bits or 0 bits

[0029] <2nd stage SCI> For example, two types of formats, SCI format 2-A and SCI format 2-B, may be prepared for the 2nd stage SCI, as follows.

[0030] <SCI format 2-A> - HARQ process number - [log_2(N_process)] bits - New data indicator - 1 bit - Redundancy version - 2 bits - Source ID - 8 bits - Destination ID - 16 bits - HARQ feedback enabled / disabled indicator - 1 bit - Cast type indicator - 2 bits - CSI request - 1 bit

[0031] <SCI format 2-B> - HARQ process number - [log_2(N_process)] bits - New data indicator - 1 bit - Redundancy version - 2 bits - Source ID - 8 bits - Destination ID - 16 bits - HARQ feedback enabled / disabled indicator - 1 bit - Zone ID - 12 bits - Communication range requirement - 4 bits

[0032] In V2X SL communication, a terminal determines the resources to be used for transmission after checking the resource usage status (or reservation status) by other terminals, for example, by sensing. By dividing the information content of the SCI into two, the number of bits and size of the 1st stage SCI can be reduced, which has the advantage of making it possible to reduce the area used for sensing. The 1st stage SCI may be allocated, for example, to the PSCCH, and the 2nd stage SCI may be allocated, for example, to the PSSCH (or a part of the PSSCH). Note that "DMRS" is an abbreviation for demodulation reference signal, and "CSI" is an abbreviation for channel state information.

[0033] FIG. 1 shows an example of the allocation of PSCCH, PSSCH, and PSFCH in a slot. PSFCH may not be allocated depending on the settings. The number of symbols in PSSCH is variable depending on the settings. The allocation of 2nd stage SCI may be changed, for example, according to the allocation of DMRS in PSSCH (not shown). 1st stage SCI may be allocated, for example, from a frequency resource lower than the frequency resource to which PSSCH is allocated. One slot consists of, for example, 14 symbols (12 symbols when an extended CP (Cyclic Prefix) is used).

[0034] [SL mode explanation] SL communication has, for example, two modes (for example, Mode 1 and Mode 2).

[0035] In Mode 1, for example, the base station determines (in other words, schedules) resources (for example, referred to as SL resources) to be used by terminals in SL.

[0036] In Mode 2, for example, a terminal selects (or determines) resources to be used for SL from resources in a preset resource pool. In other words, in Mode 2, the base station does not need to schedule resources for SL.

[0037] Mode 1 is assumed to be used in an environment where, for example, a base station and a terminal are connected and the terminal performing sidelink communication can receive instructions (or notifications) from the base station. On the other hand, in Mode 2, for example, the terminal can determine resources to use for SL even without instructions from the base station. Therefore, sidelink communication is possible, for example, with terminals under different operators or terminals outside the coverage area.

[0038] The side link has been described above.

[0039] <Communication System Overview> The communication system according to the present embodiment includes, for example, terminal 200 illustrated in Fig. 2 and base station 100 illustrated in Fig. 3. The number of terminals 200 may be one or more, but when focusing on sidelink communication, the number is two or more.

[0040] 2 is a block diagram showing an example of the configuration of a portion of a terminal 200 according to an embodiment. The terminal 200 shown in FIG. 2 may include, for example, a control unit (or a control circuit) 20A and a communication unit (or a communication circuit) 20B.

[0041] From the viewpoint of the sidelink transmitting terminal 200, the controller 20A determines and generates, for example, information for coordinating (or cooperatively controlling) resource use (or utilization) in sidelink communication between the terminals 200. This information is an example of information related to inter-UE cooperative use of sidelink resources, and may be understood as a type of control information transmitted or received between the terminals 200. Furthermore, for convenience, this information may be referred to as, for example, "resource utilization coordination information," "resource cooperative control information," or "inter-UE coordinate information."

[0042] From the perspective of the sidelink transmitting terminal, the communication unit 20B transmits resource usage adjustment information to another terminal 200. Therefore, from the perspective of the sidelink transmitting terminal 200, the communication unit 20B may be understood as an example of a transmission circuit that transmits resource usage adjustment information. Moreover, from the perspective of the sidelink receiving terminal 200, the communication unit 20B receives resource usage adjustment information transmitted by another terminal 200. Therefore, from the perspective of the receiving terminal 200, the communication unit 20B may be understood as an example of a reception circuit that receives resource usage adjustment information. Moreover, from the perspective of the sidelink receiving terminal, the control unit 20A determines resources to be used for sidelink communication (e.g., transmission) based on the resource usage adjustment information received by the communication unit 20B.

[0043] [Configuration of base station 100] Fig. 3 is a block diagram showing an example of the configuration of a base station 100 according to an embodiment. As shown in Fig. 3, the base station 100 includes, for example, a resource usage adjustment information setting unit 101, an error correction coding unit 103, a modulation unit 104, a transmission unit 106, a reception unit 107, a demodulation unit 109, and an error correction decoding unit 110.

[0044] The resource usage adjustment information setting unit 101 determines whether or not to cause the terminal 200 to transmit sidelink resource usage adjustment information based on a use case (not shown) and information reported from the terminal 200, such as information about the characteristics or capabilities of the terminal 200. When the resource usage adjustment information setting unit 101 determines to cause the terminal 200 to transmit sidelink resource usage adjustment information, the resource usage adjustment information setting unit 101 outputs information about the transmission setting of the resource usage adjustment information to the error correction coding unit 103, for example, as signaling of an upper layer (for example, RRC).

[0045] In this example, information to be transmitted in a higher layer (for example, RRC) is generated in resource usage adjustment information setting section 101, and transmission of resource usage adjustment information is set for terminal 200. However, this setting may be, for example, a setting in the application layer called "pre-configured," or may be set in advance in a SIM (Subscriber Identity Module), and terminal 200 can operate even without setting from base station 100.

[0046] Error correction coding section 103 receives, for example, a transmission data signal (DL data signal) and upper layer signaling as input, performs error correction coding on the input signal, and outputs the coded signal to modulation section 104.

[0047] The modulation unit 104 performs modulation processing on the signal input from the error correction coding unit 103, for example, and outputs the modulated data signal to the transmission unit .

[0048] The transmitter 106 performs radio transmission processing such as up-conversion and amplification on the signal input from the signal allocation unit 105, and transmits the radio signal from the antenna to the terminal 200.

[0049] For example, the receiving unit 107 receives a signal transmitted from the terminal 200 at an antenna, performs radio reception processing such as low-noise amplification and down-conversion on the received signal, and outputs the received signal to the demodulating unit 109 .

[0050] The demodulation unit 109 performs demodulation processing on the input signal, for example, and outputs the resulting signal to the error correction decoding unit 110 .

[0051] Error correction decoding section 110 decodes the signal input from demodulation section 109, for example, to obtain a received data signal (UL data signal) from terminal 200.

[0052] In Mode 1, SCI information transmitted by terminal 200 on the sidelink may be generated in base station 100 (for example, resource usage adjustment information setting unit 101 or another block not shown). The SCI information generated by base station 100 may be transmitted to terminal 200 as a signal of an upper layer or a signal of a physical layer (for example, a PDCCH (Physical Downlink Control Channel)).

[0053] [Configuration of Terminal 200] 4 is a block diagram showing an example configuration of terminal 200 according to an embodiment. In sidelink communication, terminal 200 can be either a transmitting terminal or a receiving terminal. In FIG. 4, terminal 200 includes, for example, receiving unit 201, signal separating unit 202, demodulating unit 203, error correction decoding unit 204, resource usage adjustment information receiving unit 205, resource usage adjustment information generating unit 206, error correction coding unit 207, modulating unit 208, signal allocating unit 209, and transmitting unit 210.

[0054] The receiving unit 201 receives a signal via an antenna, performs radio reception processing such as low-noise amplification and down-conversion on the received signal, and then outputs the signal to the signal separating unit 202 .

[0055] The signal separating unit 202 separates, for example, a received data signal and information indicating the result of sensing (hereinafter sometimes abbreviated as "sensing information") from the output signal of the receiving unit 201. The received data signal is output, for example, to the demodulating unit 203. The sensing information is output, for example, to the resource usage adjustment information receiving unit 205. Note that "sensing" may be understood as receiving a 1st stage SCI transmitted by another terminal 200 in a certain time period.

[0056] The demodulation unit 203 performs demodulation processing on the received data signal input from the signal separation unit 202 , for example, and outputs the demodulated signal to the error correction decoding unit 204 .

[0057] The error correction decoding unit 204, for example, decodes the demodulated signal input from the demodulation unit 203 and performs error detection, such as a cyclic redundancy check (CRC), on the decoded signal. As a result of the error detection, a signal determined to be error-free is output as a received data signal. Furthermore, the error correction decoding unit 204 outputs, from the received data signal, for example, setting information related to resource usage adjustment received in an upper layer to the resource usage adjustment information receiving unit 205.

[0058] The resource usage adjustment information receiving unit 205 receives, for example, setting information related to resource usage adjustment input from the error correction decoding unit 204 as a signal of an upper layer. The resource usage adjustment information receiving unit 205 also receives, for example, information on resources used by other terminals 200 obtained by sensing or resource usage adjustment information transmitted by other terminals 200 input from the signal separating unit 202. The information received by the resource usage adjustment information receiving unit 205 is output to, for example, the resource usage adjustment information generating unit 206. Furthermore, when terminal 200 determines resources to be used by itself based on the setting information related to resource usage adjustment, it notifies the signal allocating unit 209 of the resources to be used.

[0059] The resource usage adjustment information generation unit 206 determines whether or not to generate resource usage adjustment information to be transmitted to other terminals 200, based on, for example, pre-configured setting information or resource usage adjustment information input from the resource usage adjustment information reception unit 205. When generating resource usage adjustment information for other terminals 200, the resource usage adjustment information generation unit 206 determines, for example, on which channel the resource usage adjustment information will be transmitted, and outputs the generated resource usage adjustment information to the signal allocation unit 209.

[0060] For example, the error correction coding unit 207 receives a side link transmission data signal (SL data signal) as input, performs error correction coding on the transmission data signal, and outputs the coded signal to the modulation unit 208.

[0061] Modulation section 208 modulates the signal input from error correction coding section 207 , for example, and outputs the modulated signal to signal allocation section 209 .

[0062] The signal allocation unit 209 allocates resources to the PSCCH that transmits the 1st stage SCI, the PSSCH that transmits the SL data signal, and the 2nd stage SCI that is placed in the PSSCH, for example, based on allocation information input from the resource usage adjustment information receiving unit 205. When there is input from the resource usage adjustment information generating unit 206, the signal allocation unit 209 allocates, for example, the resource usage adjustment information to a corresponding channel of the SL resource. The signals allocated to the resources are output to the transmitting unit 210.

[0063] In addition, in signal allocation section 209, for example, ACK / NACK information may be allocated to a feedback channel (for example, PSFCH) of SL.

[0064] The transmitter 210 performs radio transmission processing such as amplification and up-conversion on the input signal from the signal allocation unit 209, and transmits the radio signal from an antenna.

[0065] When focusing on the transmission process, the signal allocation unit 209 may correspond to, for example, the control unit 20A shown in Fig. 1. The control unit 20A may include, for example, at least one of a first stage SCI generation unit 212-1, a second stage SCI generation unit 212-2, a resource usage adjustment information generation unit 206, and a signal allocation unit 209. Furthermore, the transmission unit 210 may correspond to the communication unit 20B shown in Fig. 1.

[0066] On the other hand, when attention is focused on the reception processing, the signal separation unit 202 may correspond to, for example, the control unit 20A shown in Fig. 1. The control unit 20A may include, for example, at least one of a 1st stage SCI reception unit 211-1, a 2nd stage SCI reception unit 211-2, a resource usage adjustment information reception unit 205, and a signal separation unit 202. Furthermore, the reception unit 201 may correspond to the communication unit 20B shown in Fig. 1.

[0067] (Example of operation of terminal 200) Next, an example of the operation of the terminal 200 will be described.

[0068] Fig. 5 is a flowchart showing an example of operation focusing on transmission processing of terminal 200, and Fig. 6 is a flowchart showing an example of operation focusing on reception processing of terminal 200. The operation examples shown in Fig. 5 and Fig. 6 may be considered as operation examples in one terminal 200, or may be considered as operation examples in different terminals 200. For example, the operation example shown in Fig. 5 may correspond to the operation example of transmitting terminal 200, and the operation example shown in Fig. 6 may correspond to the operation example of receiving terminal 200.

[0069] 5, the terminal 200 generates resource usage adjustment information (S101), and then transmits the generated resource usage adjustment information to other terminals 200 (S102).

[0070] 6, terminal 200 receives resource usage adjustment information transmitted from another terminal 200 (S201). Then, terminal 200 determines resources to be used for sidelink transmission based on the resource usage adjustment information received from the other terminal (S202), and performs transmission using the determined resources (S203).

[0071] By such operation, for example, the receiving terminal 200 can select and determine resources to be used for sidelink transmission, avoiding resources reserved by other terminals 200, including the transmitting terminal (e.g., resources that other terminals 200 may use for transmission).

[0072] This reduces the probability of collision (or contention) occurring in the transmission resources of the sidelink used by the terminals 200. This contributes to improving the communication performance of the sidelink, such as reliability, low latency, and reduced power consumption of the sidelink communication.

[0073] [Another example of the configuration of the terminal 200] 7 is a block diagram showing another example configuration of terminal 200 according to an embodiment. The example configuration shown in FIG. 7 may be understood to correspond to the configuration shown in FIG. 4 in which the demodulator, error correction decoder, error correction encoder, and modulator are each configured as separate blocks for the Uu link and the SL, and the relationship between resource usage adjustment information and SCI is clarified as a non-limiting example. Note that "Uu link" refers to the link between base station 100 and terminal 200. In addition, in FIG. 7, blocks with the same reference numerals as those used in FIG. 4 may be understood to correspond to the blocks already described in FIG. 4.

[0074] 7, terminal 200 includes, for example, receiver 201, signal separator 202, 1st stage SCI receiver 211-1, 2nd stage SCI receiver 211-2, Uu demodulator 203-1, SL demodulator 203-2, Uu error correction decoder 204-1, and SL error correction decoder 204-2. Terminal 200 also includes, for example, resource usage adjustment information receiver 205, resource usage adjustment information generator 206, 1st stage SCI generator 212-1, and 2nd stage SCI generator 212-2. Terminal 200 also includes, for example, Uu error correction encoder 207-1, SL error correction encoder 207-2, Uu modulator 208-1, SL modulator 208-2, signal allocation unit 209, and transmitter 210.

[0075] The receiving unit 201 receives a signal via an antenna, performs radio reception processing such as low-noise amplification and down-conversion on the received signal, and then outputs the signal to the signal separating unit 202 .

[0076] The signal separating unit 202 separates, for example, a Uu link signal and an SL signal from a signal received by the receiving unit 201 based on setting information related to resource usage adjustment. The Uu link signal is output to the Uu demodulating unit 203-1. Furthermore, the signal separating unit 202 separates, for example, a PSCCH signal from the SL signal and outputs the PSCCH signal to the 1st stage SCI receiving unit 211-1, and separates, for example, a 2nd stage SCI from the PSSCH from the SL signal based on resource allocation information input from the 1st stage SCI receiving unit 211-1 and outputs the PSSCH signal to the 2nd stage SCI receiving unit 211-2. Furthermore, the signal separating unit 202 separates, for example, a data portion from the SL signal that is addressed to the terminal 200 in the PSSCH and outputs the PSSCH signal to the SL demodulating unit 203-2.

[0077] The 1st stage SCI receiver 211-1, for example, attempts to demodulate and decode the PSCCH signal input from the signal separator 202. If the decoding is successful (in other words, if the SCI is detected), the 1st stage SCI receiver 211-1 outputs PSSCH frequency and time resource allocation information and 2nd stage SCI format information included in the SCI to the signal separator 202. Furthermore, the 1st stage SCI receiver 211-1 outputs, for example, information on resources that terminal 200 plans to transmit on the side link to the resource usage adjustment information generator 206.

[0078] For example, based on the source ID and destination ID included in the 2nd stage SCI, the 2nd stage SCI receiving unit 211-2 confirms (or determines) whether the signal received by the receiving unit 201 is a signal addressed to the terminal 200. If the signal received by the receiving unit 201 is a signal addressed to the terminal 200, the 2nd stage SCI receiving unit 211-2 outputs, for example, information used for demodulating and decoding the PSSCH to the SL demodulating unit 203-2.

[0079] The Uu demodulation unit 203-1 performs demodulation processing on the signal input from the signal separation unit 202, for example, and outputs the demodulated signal to the Uu error correction decoding unit 204-1.

[0080] The Uu error correction decoding unit 204-1 decodes the demodulated signal input from the Uu demodulation unit 203-1 and outputs the decoded signal. Of the decoded signals, for example, upper layer signaling is output to the resource usage adjustment information receiving unit 205.

[0081] The SL demodulation unit 203-2 performs demodulation processing on the signal input from the signal separation unit 202, for example, based on the 2nd stage SCI information from the 2nd stage SCI reception unit 211-2, and outputs the demodulated signal to the SL error correction decoding unit 204-2.

[0082] The SL error correction decoding unit 204-2 decodes, for example, the demodulated signal input from the SL demodulation unit 203-2, and performs error detection, such as CRC, on the decoded signal. As a result of the error detection, a signal determined to be error-free is output as a received data signal.

[0083] The resource usage adjustment information receiver 205 receives, for example, configuration information related to resource usage adjustment input from the Uu error correction decoder 204-1 as a signal of an upper layer or a PSSCH signal. The resource usage adjustment information receiver 205 also receives, for example, information on resources used by other terminals 200 obtained by sensing or resource usage adjustment information transmitted by other terminals 200, input from the 1st stage SCI receiver 211-1. The information received by the resource usage adjustment information receiver 205 is output to, for example, the resource usage adjustment information generator 206. When the resource to be used by the own terminal is determined based on the configuration information related to resource usage adjustment, the resource usage adjustment information receiver 205 notifies, for example, the signal allocator 209 of the resource to be used.

[0084] The resource usage adjustment information generation unit 206 determines whether or not to generate resource usage adjustment information to be transmitted to other terminals 200, based on, for example, pre-configured setting information or resource usage adjustment information input from the resource usage adjustment information reception unit 205. When generating resource usage adjustment information for other terminals 200, the resource usage adjustment information generation unit 206 determines, for example, on which channel the resource usage adjustment information will be transmitted, and outputs the generated resource usage adjustment information to the signal allocation unit 209.

[0085] For example, when transmitting resource usage adjustment information using the PSSCH, the resource usage adjustment information generation unit 206 instructs the 2nd stage SCI generation unit 212-2 to generate a 2nd stage SCI that notifies that the resource usage adjustment information will be transmitted using the PSSCH. Furthermore, the resource usage adjustment information generation unit 206 instructs the 1st stage SCI generation unit 212-1 to transmit a signal that notifies that there has been a change in the format of the 2nd stage SCI. Furthermore, the resource usage adjustment information generation unit 206 outputs the resource usage adjustment information to be transmitted using the PSSCH to the signal allocation unit 209, for example.

[0086] The 1st stage SCI generation unit 212-1, for example, determines a frequency resource for transmitting the PSSCH, generates an SCI including the determined information, inputs the generated SCI to the signal allocation unit 209 as a control signal, and outputs the generated SCI to the signal allocation unit 209 as a signal to be transmitted using the PSCCH. Furthermore, the 1st stage SCI generation unit 212-1 generates information instructing a change in the format of the 2nd stage SCI in accordance with an instruction from the resource usage adjustment information generation unit 206, for example, and places the generated information in the 1st stage SCI.

[0087] The 2nd stage SCI generation unit 212-2, for example, generates an SCI (2nd stage SCI) and outputs the generated SCI to the signal allocation unit 209. The SCI may include, for example, information identifying the source terminal 200 (for example, a source ID), information identifying the destination terminal 200 (for example, a destination ID), and information related to demodulation and decoding. Furthermore, when there is an instruction from the resource usage adjustment information generation unit 206 to notify the other terminals 200 of resource usage adjustment information using the PSSCH, the 2nd stage SCI generation unit 212-2 may include, for example, information notifying that the resource usage adjustment information will be transmitted, in the 2nd stage SCI.

[0088] The Uu error correction coding unit 207-1 receives, for example, a transmission data signal (UL data signal) of the Uu link, performs error correction coding on the transmission data signal, and outputs the coded signal to the Uu modulation unit 208-1.

[0089] The Uu modulation unit 208-1 modulates the signal input from the Uu error correction coding unit 207-1, for example, and outputs the modulated signal to the signal allocation unit 209.

[0090] The SL error correction encoding section 207-2 receives, for example, an SL transmission data signal (SL data signal), performs error correction encoding on the transmission data signal, and outputs the encoded signal to the SL modulation section 208-2.

[0091] The SL modulation section 208-2 modulates the signal input from the SL error correction coding section 207-2, for example, and outputs the modulated signal to the signal allocation section 209.

[0092] For example, based on the allocation information for the SL signal input from 1st stage SCI generation unit 212-1, signal allocation unit 209 allocates the PSCCH for transmitting the 1st stage SCI, the PSSCH for transmitting the SL data signal, and the 2nd stage SCI to be placed on the PSSCH to resources. When there is input from resource usage adjustment information receiving unit 205, signal allocation unit 209 allocates the SL data signal to the PSSCH, for example, in accordance with an instruction from resource usage adjustment information receiving unit 205. Furthermore, when there is input from resource usage adjustment information generating unit 206, signal allocation unit 209 allocates, for example, resource usage adjustment information to the PSSCH. Furthermore, signal allocation unit 209 allocates, for example, UL data signals to resources used for the PUSCH between base station 100 and terminal 200. The signals allocated to resources as described above are output to transmission unit 210.

[0093] In the signal allocation unit 209, for example, the ACK / NACK information may be allocated to a feedback channel (for example, PSFCH) of the SL.

[0094] The transmitter 210 performs radio transmission processing such as amplification and up-conversion on the input signal from the signal allocation unit 209, and transmits the radio signal from an antenna.

[0095] In the configuration illustrated in Figure 7, the demodulation unit, error correction decoding unit, error correction coding unit, and modulation unit are each configured as separate blocks for the Uu link and SL, but some or all of them may be common blocks.

[0096] Furthermore, the resource usage adjustment information is not limited to being received by terminal 200 as signaling from an upper layer. For example, the resource usage adjustment information may be set in advance in a SIM, or may be set in advance in terminal 200 by an application layer called pre-configured. Terminal 200 can also use pre-configured information for resource usage adjustment without receiving configuration information related to resource usage adjustment.

[0097] [Example] In this embodiment, for example, terminal 200 transmits resource usage adjustment information to other terminals 200. The other terminals 200 that have received the resource usage adjustment information determine and decide, for example, which resources are likely to be used by the other terminals 200, or which resources to use for transmission. By using the resource usage adjustment information, it is possible to reduce the incidence of collisions with resources used by the other terminals 200 for transmission.

[0098] When there are multiple pieces of resource usage adjustment information, terminal 200 may determine (or set) which resource usage adjustment information to transmit and which channel to transmit the resource usage adjustment information on. In this way, resource usage adjustment information can be selected and set to terminal 200 according to the characteristics or capabilities of terminal 200.

[0099] The resource usage adjustment information may be set to one or more of the following types of information. Resources may be specified, for example, by frequency and time resource units. As a non-limiting example, the frequency domain may be divided into multiple subchannels, the time domain may be divided into multiple slots, and resources may be specified by slot numbers and subchannel numbers.

[0100] Hereinafter, the terminal 200 that transmits the resource usage adjustment information will be referred to as UE-A, and the terminal 200 that receives the resource usage adjustment information will be referred to as UE-B, and an example of cooperative operation between terminals 200 will be described. Note that if the resource usage adjustment information is set to be transmitted so that it can be received only by a specific terminal 200, for example, by unicast, then only that specific UE can receive the resource usage adjustment information.

[0101] On the other hand, if the resource usage adjustment information is set to be transmitted so that it can be received by multiple UEs, such as by broadcast or groupcast, multiple UEs can receive the resource usage adjustment information. Therefore, the number of terminals 200 corresponding to UE-B is not necessarily one.

[0102] UE-A, which has transmitted the resource usage adjustment information, will not transmit on the resource that it has notified other UEs that it is available for use. Therefore, when other UEs transmit, conflicts over resources to be used between UE-A and other UEs can be avoided or suppressed.

[0103] [Resource Usage Adjustment Information 1] UE-A receives the 1st stage SCI transmitted by other UEs during a certain time period. This is also called sensing. By receiving the 1st stage SCI, UE-A can obtain information about the resources on which other UEs plan to transmit.

[0104] UE-A may transmit information about resources that other UEs plan to transmit together. In this case, UE-A may also transmit information about resources that UE-A plans to transmit. Furthermore, if UE-A knows unavailable resources based on notifications from layers such as RRC and MAC (Media Access Control) obtained from information other than the 1st stage SCI, or notifications or settings from the application layer, UE-A may also transmit information about available and unavailable resources as resource usage adjustment information, including information about those resources.

[0105] In this way, UE-B, which receives resource usage adjustment information from UE-A, can obtain information about resource usage that it could not obtain because it did not receive the 1st stage SCI. For example, a UE that cannot receive while transmitting in the same frequency band will not receive the 1st stage SCI from other UEs while transmitting. This is called the half-duplex issue. UEs can obtain (or supplement) the information they do not receive due to the half-duplex issue from resource usage adjustment information from other UEs. Furthermore, a UE that has shortened the sensing time for the 1st stage SCI to reduce power consumption also benefits by being able to obtain information from other UEs that it would not have been able to obtain with the shortened sensing time.

[0106] UE-A may notify UE-B, for example, of information regarding windows or slots in which sensing is "available" at UE-A, or information regarding windows or slots in which sensing is "not available" at UE-A. UE-B can recognize and understand information regarding resources that can be obtained by sensing at UE-A, or information regarding resources that cannot be obtained.

[0107] As described above, the UE may take into account resource usage adjustment information when selecting resources to use for SL.

[0108] A non-limiting example is shown in Figure 8. As shown in Figure 8, UE-A senses the 1st stage SCI of other UEs in slots #0 to #7, and transmits resource usage coordination information (inter-UE coordinate information) in slot #8. In this case, UE-A may compile information on resources scheduled for transmission obtained from multiple 1st stage SCIs received before slot #8 and transmit it as resource usage coordination information.

[0109] For example, suppose that information sensed in slot #0 indicates that there is a possibility that another UE will transmit on sub-channel #2 of slot #10, and that information sensed in slot #1 indicates that there is a possibility that another UE will transmit on two sub-channels #0 and #1 of slot #12.

[0110] In this case, the resource usage adjustment information notifies that subchannel #2 of slot #10 and subchannels #0 and #2 of slot #12 may be used by other UEs. This notification may use, for example, a bitmap in which resources that may be used are represented by "1" and resources that are unlikely to be used or may not be used are represented by "0". Alternatively, the notification may be configured to notify resources that may be used by other UEs on a slot-by-slot basis.

[0111] In addition, multiple UEs can transmit resource usage adjustment information to compensate for information not received due to the half-duplex issue. For example, as shown in Fig. 9, UE-A and UE-B each transmit resource usage adjustment information, and the information on resource usage that UE-A and UE-B did not receive can be compensated for by each other.

[0112] [Resource Usage Adjustment Information 2] For example, UE-A may transmit information about resources that UE-A may use as resource utilization adjustment information. This information may be the same as the information transmitted in the first stage SCI of the rel.16 NR sidelink. In the first stage SCI of the rel.16 NR sidelink, information about resources scheduled for transmission up to 32 slots later can be transmitted. However, if UE-A cancels a scheduled transmission, it does not need to use the resources that it notified as scheduled for transmission.

[0113] The resource usage adjustment information 2 may indicate resources that may be used for a longer period than the information on resources transmitted in the 1st stage SCI of rel.16 NR. Also, in the 1st stage SCI of the rel.16 NR sidelink, a resource transmission schedule within the same resource pool is indicated, but a transmission schedule for resources in a different resource pool may be indicated. The different resource pools may exist in the same frequency band, that is, a band width part (BWP), or may be different BWPs. Also, the different resource pools may be carriers assigned the same cell ID or may be different carriers.

[0114] [Resource Usage Adjustment Information 3] For example, UE-A may transmit information about resources available for transmission by UE-B as resource usage adjustment information. For example, UE-A may select resources suitable for transmission by UE-B as candidate resources based on at least one of information about resources on which other UEs plan to transmit, obtained by sensing, and information obtained by measuring channel quality. Note that the "candidate resources" in this case may also be referred to as "recommended resources." UE-A may transmit (or notify) information about the selected candidate resources to UE-B as resource usage adjustment information.

[0115] The following information can be given as a non-limiting example of information obtained by measuring line quality: -CQI(channel quality indicator) -RSRP(Reference Signal Received Power) -RSRQ(Reference Signal Received Quality) - SINR(Signal to Interference plus Noise Ratio)

[0116] The number of candidate resources indicated in the resource usage adjustment information transmitted from UE-A may be 1 or 2 or more. If the number of candidate resources is 2 or more, UE-B may select, for example, a resource to be used for transmission from among the two or more candidate resources.

[0117] However, UE-B may decide which resources to use for transmission or may decide not to transmit at its own discretion, without following instructions from UE-A (in other words, without using or ignoring the received resource usage adjustment information).

[0118] A non-limiting example is shown in Figure 10. As shown in Figure 10, UE-A identifies resources (denoted as "reserved" in Figure 10) that may be used by other UEs from information obtained by sensing in slots #0 to #7.

[0119] UE-A determines candidate resources (denoted as "recommended" in FIG. 10) that can be used for transmission by UE-B, for example, from resources that are unlikely to be used by other UEs (e.g., resources that are not marked as "reserved"), and notifies UE-B of subchannel #1 of slot #11 and subchannel #2 of slot #12 as candidate resources using the resource usage adjustment information for slot #8.

[0120] UE-B may select one of the two candidate resources (subchannel #1 of slot #11 and subchannel #2 of slot #12) indicated in the resource usage adjustment information and transmit using the selected resource. However, UE-B may transmit using a resource other than the resource indicated in the resource usage adjustment information, or may not transmit at all.

[0121] 10 shows an example in which UE-B selects subchannel #1 of slot #11 from among the multiple candidate resources indicated in the resource usage adjustment information received from UE-A and transmits. In this case, the format used by UE-B for transmission can be the same as the rel.16 format.

[0122] Contrary to the above example, UE-A may notify UE-B of resources that are not suitable for transmission by UE-B (which may be conveniently referred to as "non-recommended resources") using resource usage adjustment information. In this case, UE-B may select and determine resources to use for transmission, avoiding the resources indicated in the received resource usage adjustment information. The non-recommended resources may be selected and determined based on, for example, at least one of information on resources that other UEs plan to use for transmission and information obtained by measuring channel quality.

[0123] [Resource Usage Adjustment Information 4] UE-A may transmit information about resources used by UE-B for transmission as resource utilization adjustment information. This resource utilization adjustment information may be understood to correspond to resource allocation information (or scheduling information) for other UEs. UE-B transmits according to the resource allocation (or resource scheduling) by UE-A.

[0124] The resource usage adjustment information 4 transmitted by UE-A may be information for one UE or for multiple UEs. UE-A transmitting resource usage adjustment information for multiple UEs may be called a header UE. UE-A schedules UEs in a group or nearby UEs, just like base station 100 (e.g., gNB).

[0125] The scheduling information may be configured to be received only by UE-B, which receives resource usage adjustment information 4 and transmits based on that information, or may be configured to be received by the UE to which UE-B transmits.

[0126] If the destination UE to which UE-B transmits also receives the resource usage adjustment information, UE-B can enter a receiving state in preparation for receiving the transmission from the destination UE in the designated resource, thereby avoiding the half-duplex issue. Also, UE-B can reduce power consumption by entering a receiving state in the designated resource and pausing reception in other resources.

[0127] A non-limiting example is shown in Fig. 11. As shown in Fig. 11, similar to resource usage adjustment information 3, UE-A identifies resources (denoted as "reserved" in Fig. 11) that may be used by other UEs from information obtained by sensing in slots #0 to #7.

[0128] Then, UE-A determines the resources (denoted as "scheduled" in FIG. 11) to allocate to UE-B's transmission, for example, from resources that are unlikely to be used by other UEs (for example, resources that are not marked as "reserved"), and notifies subchannel #1 of slot #11 as resource allocation information for UE-B using resource usage adjustment information 4 of slot #8.

[0129] UE-B transmits using the resource (subchannel #1 of slot #11 in FIG. 11) notified (in other words, scheduled) by UE-A. In this case, the format used by UE-B for transmission can be the same as the rel.16 format.

[0130] [Items common to all embodiments] When UE-A corresponds to a receiving UE (Rx UE) for UE-B, the information on resources available to UE-B included in the resource usage adjustment information transmitted by UE-A may be selected from the slots in which UE-A is in a receiving state. In this way, UE-A can avoid failing to receive the signal transmitted by UE-B because UE-A is in a transmitting state.

[0131] Furthermore, the information about resources available for transmission by UE-B, which is transmitted from UE-A to UE-B, may be limited to information about resources used by UE-B for transmissions addressed to UE-A, or may include information about resources used by UE-B for transmissions addressed to UEs other than UE-A. Regarding the resources used by UE-B for transmissions addressed to UEs other than UE-A, UE-A may specify the destination UE for transmission by UE-B.

[0132] The timing at which the UE transmits the resource usage adjustment information may be set to periodic (periodic) or aperiodic (aperiodic). In the case of periodic transmission, the timing may be set in units of, for example, 10, 11, ..., 160, 200, 300 (m seconds or slots). In the case of aperiodic transmission, the resource usage adjustment information may be set to be transmitted together with the data signal when UE-A transmits the data signal, or may be set to be transmitted when another UE requests transmission of the resource usage adjustment information.

[0133] The resource information transmitted by resource usage adjustment information 1, 2, 3, and 4 is information notifying slot numbers and subchannel numbers, but the information in the time direction may not be slot numbers but may be symbol numbers or different time units called subslots or subframes.Furthermore, the information in the frequency direction is subchannels, but may be different frequency units such as resource blocks, subbands, resource pools, BWPs, and carriers.

[0134] Resource usage adjustment information 2 may notify resources that may be used for a longer period than the resource information transmitted by the 1st stage SCI of rel.16 NR. Other resource usage adjustment information 1, 3, and 4 may also notify resources that are 32 slots behind, or may notify resource usage adjustment information for a longer period.

[0135] Next, the channel for transmitting resource usage adjustment information will be described. Examples of the channel for transmitting resource usage adjustment information include PSSCH, 2nd stage SCI, new channel, PSFCH, higher layer signaling, and 1st stage SCI. It is also possible to transmit resource usage adjustment information by combining multiple channels.

[0136] [PSSCH] The UE-A may transmit the resource usage adjustment information using the PSSCH. The following two operation examples are given as examples of a method for notifying that the PSSCH includes the resource usage adjustment information.

[0137] (PSSCH operation example 1) In PSSCH operation example 1, the 1st stage SCI or 2nd stage SCI notifies that resource usage adjustment information is included in the PSSCH, and the resource usage adjustment information is transmitted via the PSSCH.

[0138] The 2nd stage SCI may use SCI format 2-A or SCI format 2-B to indicate that the PSSCH contains resource usage adjustment information, or may use a new format with a different name, such as SCI format 2-C.

[0139] The PSSCH may be transmitted in any of the following cast types: broadcast, groupcast, and unicast. The cast type is indicated in SCI format 2-A. SCI format 2-B is the format used for groupcast. In the case of broadcast, the resource utilization adjustment information can be received by any UE.

[0140] In the case of resource usage adjustment information 1 and resource usage adjustment information 2, it is not essential to specify which UE the information is addressed to, so by transmitting it using broadcast, multiple UEs can share the resource usage status.

[0141] On the other hand, in the case of resource usage adjustment information 3 or resource usage adjustment information 4, in order to clarify which UE the resource allocation information is addressed to, for example, a Destination ID, which is an ID that identifies the UE, may be included in the PSSCH notification.

[0142] In the case of groupcast, resource usage adjustment information is transmitted to a UE group. The UE group can be identified based on the Destination ID notified by the 2nd stage SCI, for example. In the case of groupcast, UEs in a certain UE group can share resource usage adjustment information.

[0143] In the case of resource usage adjustment information 3 or resource usage adjustment information 4, as with broadcast, in order to clarify which UE the resource allocation information is intended for, for example, a Destination ID, which is an ID that identifies which UE the information is intended for, may be included in the PSSCH notification.

[0144] In the case of unicast, resource usage adjustment information is transmitted to a specific UE. The UE to which the information is addressed can be determined from the Destination ID notified by the 2nd stage SCI, so the destination UE can be identified even if the Destination ID is not included in the PSSCH.

[0145] When the PSSCH includes resource utilization adjustment information, the resource utilization adjustment information may be coded as a data signal in the PSSCH or may be coded separately from the data signal in the PSSCH.

[0146] An example of transmitting resource usage adjustment information in a PSSCH region is shown in Fig. 12. As shown in Fig. 12, candidate resources for transmitting (or arranging) resource usage adjustment information within a slot may be the entire PSSCH region.

[0147] When the resource utilization adjustment information is coded separately from the data signal in the PSSCH, resources for transmitting the resource utilization adjustment information may be reserved in the PSSCH, for example, as shown in Figure 13. In other words, the candidate resources for transmitting (or arranging) the resource utilization adjustment information in the slot may be some resources in the PSSCH region. For example, which symbols and which subcarriers in the PSSCH are to be used as resources for transmitting the utilization adjustment information may be predetermined.

[0148] When the resource utilization adjustment information is decoded separately from the PSSCH data signal, for example, there is an advantage that the resource utilization adjustment information can be decoded before the data signal.When the PSSCH data signal and the resource utilization adjustment information are decoded separately, the amount of data that can be transmitted in the PSSCH varies depending on the size of the resource utilization adjustment information.Therefore, for example, the TBS (Transport Block Size), which is the amount of data to be transmitted in the PSSCH, may be calculated based on resources excluding the resource amount of the resource utilization adjustment information.

[0149] When SCI format 2-A or SCI format 2-B is used to indicate that resource usage adjustment information is included in the PSSCH, for example, a bit indicating that resource usage adjustment information is included in the PSSCH may be added to SCI format 2-A or SCI format 2-B. Alternatively, a bit in SCI format 2-A or SCI format 2-B may be replaced with a bit indicating that resource usage adjustment information is included in the PSSCH.

[0150] When notification bits are added, the number of bits in SCI format 2-A or SCI format 2-B is different compared to when notification bits are not added. When bits in SCI format 2-A or SCI format 2-B are replaced with notification bits, the information content of SCI format 2-A or SCI format 2-B is different.

[0151] Therefore, for example, the fact that the number of bits is different or that bits are replaced is notified in advance by a higher layer (e.g., RRC) or is set in advance as a so-called pre-configured setting. In this way, the UE that has been notified or set can change or replace the number of reception bits of the 2nd stage SCI.

[0152] It is also possible to configure the 1st stage SCI to notify a change in the number of bits or a replacement. For example, reserved bits included in the 1st stage SCI may be used to notify that the number of bits in SCI format 2-A and SCI format 2-B is different, or to notify a bit replacement.

[0153] In addition, in SCI format 2-A, the inclusion of resource utilization adjustment information in the PSSCH may be notified by setting the HARQ feedback enabled / disabled indicator to enable and the Cast type indicator to broadcast. Since this combination does not exist in rel.16, HARQ feedback cannot be configured in the case of broadcast. Legacy UEs that receive this signal may determine that they have received SCI format 2-A incorrectly because this combination does not exist. However, UEs that are aware of the new configuration can determine that they have been notified that the PSSCH includes resource utilization adjustment information.

[0154] Even when a new SCI format is used to notify that resource usage adjustment information is included in the PSSCH, the UE can receive the new SCI format by notifying the use of the new SCI format in advance in a higher layer (e.g., RRC), by setting it in advance as called pre-configured, or by instructing the UE to receive the new SCI format in reserved bits included in the 1st stage SCI.

[0155] In addition, when notifying that resource usage adjustment information is included in the PSSCH using SCI format 2-A, SCI format 2-B, or a new SCI, the notification may be made using a destination ID or a source ID.

[0156] For example, a destination ID or source ID to be used when transmitting resource usage adjustment information in a PSSCH is set in advance. The preset destination ID or source ID is set to a value different from the destination ID or source ID used when transmitting data in other PSSCHs.

[0157] In this way, a UE that receives SCI format 2-A, SCI format 2-B, or a new SCI can recognize from the destination ID or source ID that resource usage adjustment information is included in the PSSCH.

[0158] Furthermore, when the 1st stage SCI is used to notify that resource usage adjustment information is included in the PSSCH, this notification may be made using, for example, a reserved bit.

[0159] (PSSCH operation example 2) In PSSCH operation example 2, for example, it is notified that the area for transmitting MAC header (also called subheader) resource usage adjustment information is in the MAC CE (Control Element), and the resource usage adjustment information is transmitted in the MAC CE. The MAC header and MAC CE are transmitted in the data area of the PSSCH.

[0160] [2nd stage SCI] The resource utilization adjustment information may be transmitted in the second stage SCI or the new SCI format. When transmitting the resource utilization adjustment information in SCI format 2-A or SCI format 2-B, a notification bit may be added to SCI format 2-A or SCI format 2-B. Alternatively, a bit in SCI format 2-A or SCI format 2-B may be replaced with a notification bit.

[0161] If notification bits are added, the number of bits in SCI format 2-A or SCI format 2-B will be different compared to when notification bits are not added. If bits in SCI format 2-A or SCI format 2-B are replaced with notification bits, the information content of SCI format 2-A or SCI format 2-B will be different.

[0162] Therefore, for example, the fact that the number of bits is different or that bits are replaced is notified in advance in a higher layer (for example, RRC), or is set in advance as being called pre-configured.

[0163] In this way, the UE that has been notified or configured can change or replace the number of received bits of the 2nd stage SCI. It is also possible to configure the 1st stage SCI to notify the change or replacement of the number of bits of the 2nd stage SCI. Furthermore, reserved bits included in the 1st stage SCI may notify that the number of bits of SCI format 2-A and SCI format 2-B is different or that bits are replaced.

[0164] For example, when using SCI format 2-B, set the HARQ feedback enabled / disabled indicator to disabled, - Zone ID - 12 bits - Communication range requirement - 4 bits may be used to transmit resource utilization adjustment information.

[0165] In broadcast using SCI format 2-B, if HARQ feedback is not requested (for example, if disabled), the Zone ID and Communication range requirement information are not used because they are used for HARQ feedback. Therefore, these bits may be used for resource utilization adjustment information.

[0166] Even when the resource usage adjustment information is notified using a new SCI format, the UE can receive the new SCI format by notifying in advance in a higher layer (e.g., RRC) that the new SCI format will be used, by setting the new SCI format in advance as being called pre-configured, or by instructing reception of the new SCI format in reserved bits included in the 1st stage SCI. Since the new format includes the resource usage adjustment information, it may be a format that includes a larger number of bits and has a larger payload size than SCI format 2-A or SCI format 2-B.

[0167] When notifying resource usage adjustment information using SCI format 2-A, SCI format 2-B, or a new SCI, the presence of the resource usage adjustment information may be notified by a destination ID or a source ID. For example, the destination ID or source ID to be used when transmitting resource usage adjustment information is set in advance. The preset destination ID or source ID is set to a value different from the destination ID or source ID used when transmitting data for other PSSCHs.

[0168] In this way, a UE that receives SCI format 2-A, SCI format 2-B, or a new SCI can recognize from the destination ID or source ID that the second stage SCI includes resource usage adjustment information. Which bits in SCI format 2-A, SCI format 2-B, or a new SCI are replaced with resource usage adjustment information is determined in advance, for example.

[0169] In addition, in SCI format 2-A, the presence of resource utilization adjustment information may be notified by setting the HARQ feedback enabled / disabled indicator to enable and the Cast type indicator to broadcast. Since this combination does not exist in rel.16, HARQ feedback cannot be configured in the case of broadcast. Legacy UEs that receive this signal may determine that they have received SCI format 2-A incorrectly because this combination does not exist. However, UEs that are aware of the new configuration can determine that they have been notified of the presence of resource utilization adjustment information. In this case, part of the information in SCI format 2-A may be replaced with the resource utilization adjustment information.

[0170] [new channel] The resource utilization adjustment information may be transmitted through a new channel. Even when the resource utilization adjustment information is notified through a new channel, the use of the new channel may be notified in advance in a higher layer (e.g., RRC), or may be set in advance as being called pre-configured, or the reserved bits included in the 1st stage SCI or the 2nd stage SCI may indicate that the resource utilization adjustment information exists in the new channel, so that the UE can receive the new channel.

[0171] The new channel may be allocated to a PRB, subchannel, resource pool, BWP, or carrier that is different from the existing channels. For example, in Rel. 16, if the number of PRBs in a resource pool is not a multiple of the number of PRBs included in a subchannel, the remaining PRBs are not used for resource allocation. Therefore, as shown in FIG. 14, a new channel may be allocated to the remaining PRBs (remaining PRB(s)), and resource usage adjustment information may be transmitted on this new channel. This has the advantage of improving resource usage efficiency. The new channel may be allocated to the entire slot, or only to a portion of the slot, or may be allocated across multiple slots.

[0172] [PSFCH] The resource usage adjustment information may be transmitted by the PSFCH. In the PSFCH of Rel. 16, one bit of ACK / NACK is transmitted by one symbol, which is the same format as PUCCH format 0. Here, the format indicates the number of symbols, sequence, DMRS allocation, etc.

[0173] The PSFCH in which the resource usage adjustment information is allocated may have a format different from that of the PSFCH of Rel. 16. A different format may be, for example, a format equivalent to PUCCH format 1, 2, 3, or 4. For example, PUCCH formats 2, 3, and 4 can allocate more than two bits, and are therefore suitable when the amount of information in the resource usage adjustment information is more than two bits. Also, the PSFCH may be configured using a format different from the PUCCH format.

[0174] When transmitting resource usage adjustment information via the PSFCH, the resource usage adjustment information may be configured to be transmitted only when requested by another UE. For example, when UE-B requests UE-A to transmit resource usage adjustment information, UE-A transmits the resource usage adjustment information via the PSFCH.

[0175] In this way, the resources to be used for the PSFCH transmitted by UE-A can also be determined at the time of transmission by UE-B. UE-A does not need to notify information on the allocation and modulation of PSFCH resources using information such as 1st stage SCI and 2nd stage SCI, as is the case when transmitting a PSSCH. Therefore, for example, the PSFCH may be transmitted without transmitting the 1st stage SCI and 2nd stage SCI, which has the advantage of reducing overhead in resource usage.

[0176] [RRC] The resource usage adjustment information may be transmitted, for example, using RRC of the Uu link or PC5 RRC between UEs. Alternatively, some resource usage adjustment information may be transmitted using RRC or PC5 RRC, and other resource usage adjustment information may be transmitted by any of the methods shown in the above-mentioned operational examples. For example, information with a long allocation period may be transmitted using RRC or PC5 RRC, and information with a short allocation period may be transmitted by any of the methods shown in the above-mentioned operational examples.

[0177] [1st stage SCI] The resource usage adjustment information may be transmitted using the 1st stage SCI. For example, in the resource usage adjustment information 3 or the resource usage adjustment information 4, the 1st stage SCI may be used when UE-A transmits the resource usage adjustment information of UE-B.

[0178] (1st stage SCI operation example 1) The resource usage adjustment information may be transmitted, for example, in the resource of the same slot as the 1st stage SCI. An example is shown in FIG.

[0179] For example, UE-A transmits resource allocation information for UE-B, which transmits in the same slot, using the 1st stage SCI. The reserved bit in the 1st stage SCI may be used to indicate which UE the information is to be allocated to. UE-A does not transmit in any SCI other than the 1st stage SCI in the same slot.

[0180] UE-B receives the 1st stage SCI, and if the resource addressed to UE-B exists in the same slot as the slot in which the 1st stage SCI was received, UE-B transmits the 2nd stage SCI and PSSCH. However, in the case of resource usage adjustment information 3, UE-B may decide not to perform transmission.

[0181] In this way, PSSCH transmission allocation and PSSCH transmission from different terminals can be performed within the same slot, thereby shortening the delay from allocation to data transmission. Note that the Rel. 16 frame format allows the 1st stage SCI and PSSCH region to be frequency-multiplexed. Therefore, it is preferable to avoid using the Rel. 16 format as is. Therefore, the 1st stage SCI transmitted by UE-A and the 2nd stage SCI PSSCH transmitted by UE-B are not frequency-multiplexed, but are time-multiplexed, for example, so that UE-B starts transmission X symbols after the 1st stage SCI.

[0182] Alternatively, the 1st stage SCI and the 2nd stage SCI may be transmitted by the UE-A, and the data portion of the PSSCH may be transmitted by the UE-B.

[0183] (1st stage SCI operation example 2) In this operation example, the resource allocation of the own station and resource usage adjustment information addressed to other UEs are transmitted by the 1st stage SCI. The reserved bit in the 1st stage SCI may be used to indicate which UEs are to be allocated.

[0184] In the time resource assignment for the 1st stage SCI, time resources for two or three slots can be assigned. The first slot is a slot for transmitting the 1st stage SCI.

[0185] In this operation example, the allocation of the same slot as the 1st stage SCI in the first slot is allocated to the same UE as the UE transmitting the 1st stage SCI, i.e., it is a resource of UE-A, and the allocation of the second and third slots is allocated to other UEs.

[0186] This has the advantage that the arrangement (or format) of the 1st stage SCI, 2nd stage SCI and PSSCH in the first slot does not need to be changed compared to Re.16.

[0187] In the second and third slots, the UE to which resources are allocated in the first slot can transmit the 1st stage SCI and the 2nd stage SCI.

[0188] In this way, transmission can be performed without changing the format from Rel. 16. An example is shown in Figure 16. In Figure 16, UE-A notifies UE-B to transmit in slot #3. UE-A performs its transmission in slot #0, and UE-B performs its transmission in slot #3.

[0189] In this operation example, since the format does not need to be changed from Rel. 16, even UEs that do not support the function of receiving resource usage adjustment information can receive resources.

[0190] (1st stage SCI operation example 3) In this operation example, the 1st stage SCI is used to notify other UEs whether they are allowed to transmit to resources that have been periodically determined in advance by a higher layer or the like. This notification may be performed, for example, using a reserved bit in the 1st stage SCI. In this way, it is not necessary to transmit resource allocation information in the 1st stage SCI, and the number of bits can be reduced.

[0191] Next, an example of a method for determining a UE to which resource usage adjustment information is to be transmitted will be described.

[0192] (Method 1: Pre-setting) The UE that transmits the resource usage adjustment information may be determined by the base station 100 (e.g., eNB or gNB) and configured in a System Information Block (SIB) called "configured" or in other higher layers such as RRC or MAC. Alternatively, the UE that transmits the resource usage adjustment information may be pre-configured in specifications, for example, as called "pre-configured," or may be pre-configured in the SIM, or may be configured in the application layer. For example, when sidelink communication is used for communication such as mission critical communication, it is efficient to pre-configure which UE transmits the resource usage adjustment information, since this can reduce wasteful resource usage.

[0193] (Method 2: S-SSB) The UE that transmits the resource usage adjustment information may be, for example, a UE that transmits an S-SSB. The UE that transmits the S-SSB may be, for example, a UE that has already established a Uu link with the base station 100. The UE that transmits the S-SSB may transmit the resource usage adjustment information together with the S-SSB.

[0194] The S-SSB is a signal including the S-PSS, S-SSS, and PSBSH, and is transmitted, for example, at a 160 ms interval, for synchronization acquisition and for transmitting information on the PSBCH. When transmitting this S-SSB, resource usage adjustment information may be transmitted in a PRB adjacent to the S-SSB or in a symbol or slot adjacent to the S-SSB. In this way, other UEs can receive the resource usage adjustment information at a fixed timing, such as a 160 ms interval.

[0195] (Method 3: UE decides) The UE may determine whether to transmit resource utilization adjustment information. For example, the UE may generate a random value, compare the random value with a predetermined value, and determine to transmit resource utilization information if the random value is within a certain range. The random value may be generated based on information such as the UE ID, member ID, scrambling sequence, and slot number. This prevents multiple UEs from transmitting resource utilization information in an unorganized manner.

[0196] (Method 4: Determined by PSSCH conditions) The UE may transmit resource usage adjustment information when the TBS to be transmitted is greater than a certain value (e.g., a threshold value). The larger the TBS, the smaller the overhead of the resource usage adjustment information, which has the effect of reducing the impact on resource usage.

[0197] Furthermore, a UE may transmit resource usage adjustment information when the MCS is higher than a certain value (e.g., a threshold value). The higher the MCS, the better the communication quality between UEs is considered to be, and therefore, for example, it is expected that the distance between UEs is short. In this case, it is considered that surrounding UEs are UEs in a similar communication environment, so sharing sensed information is effective.

[0198] (Method 5: Determined based on whether or not there was prior communication) The UE that transmits the resource usage adjustment information may be a UE that has previously (or in the past) performed sidelink communication with another UE. For example, when communication occurs between UE-A and UE-B, UE-A may transmit the resource usage adjustment information. For example, UE-A that transmits the resource usage adjustment information may be a UE that was a destination UE or a source UE for UE-B.

[0199] (Method 6: UE requested by a pedestrian UE) A UE requested by a pedestrian UE may transmit resource usage adjustment information. Since a pedestrian UE is assumed to be a mobile terminal such as a smartphone, it desires to minimize power consumption. Therefore, it is effective to have other UEs share sensing information, and therefore, other UEs requested by a pedestrian UE may transmit resource usage adjustment information.

[0200] (Method 7: Determined based on distance or SINR) Resource usage adjustment information may be transmitted when the SINR is higher than a certain value (e.g., a threshold) or when the distance between terminals is closer than a certain distance (e.g., a threshold). When the SINR is higher than a threshold or when the distance is closer than a threshold, the surrounding UEs are considered to be in a similar communication environment, and therefore sharing of sensed information is effective. The distance between terminals may be determined based on, for example, a Zone ID. Alternatively or additionally, the distance between terminals may be determined based on information from the application layer.

[0201] (others) In the above-described embodiment, a channel for transmitting new resource usage adjustment information has been described, but the method for allocating new channels to resources may be used for allocating other new information. Examples of other new information include allocation information to different carriers or BWPs, information on whether or not to repeat transmission and the number of times, the format of a PSFCH, information specifying a transmission resource, information for setting transmission power, information specifying a transmission beam, information specifying the number of layers in MIMO (Multiple-Input and Multiple-Output) transmission, and information specifying whether or not to transmit a synchronization signal and the resource.

[0202] The above-described operation examples may be used in combination. For example, the operation example may be different for each UE, or one UE may transmit resource usage adjustment information using multiple operation examples. For example, a UE that transmits resource usage adjustment information 2 may transmit the resource usage adjustment information 2 using the 1st stage SCI and PSSCH. In this case, the 1st stage SCI may indicate information up to 32 slots behind, and the PSSCH may indicate information on slots further behind.

[0203] Alternatively, for example, a UE called a header UE may transmit resource usage adjustment information 3 or resource usage adjustment information 4, and another UE connected to the header UE may transmit resource usage adjustment information 1 or resource usage adjustment information 2. In this way, the header UE can receive resource allocation information of other UEs that it cannot receive at the time of its own transmission from other member UEs to supplement the information.

[0204] Terminals communicating in the sidelink may include terminals that perform only one of transmission and reception, and terminals that perform both transmission and reception.

[0205] When the sidelink configuration is preconfigured, the configuration method may be, for example, preconfigured according to specifications or preconfigured in the SIM. The configuration method may include a configuration in the application layer called "pre-configured," a configuration in a higher layer such as an SIB or other RRC called "configured," or a configuration in the MAC.

[0206] The above-described embodiment may be applied to communication between base station 100 and terminal 200 by replacing PSCCH with PDCCH, PSSCH with PDSCH or PUSCH, PSFCH with PUCCH, and PSBCH with PBCH. Also, the 2nd stage SCI may be replaced with UCI (Uplink control information), which is uplink control information, and the above-described embodiment may be applied to UCI transmitted in PUSCH.

[0207] Furthermore, the above-described embodiment may be applied to only Mode 2 of Mode 1 and Mode 2 of the sidelink.

[0208] The resource usage adjustment information may be shared among multiple UEs. In this way, sensing information that is not received due to the half duplex issue can be compensated for by each UE. A UE that is set to receive resource usage adjustment information may be set not to perform sensing. In this way, power consumption associated with sensing can be reduced.

[0209] The embodiments of the present disclosure have been described above.

[0210] [Other embodiments] (base station) In the present disclosure, the base station may be a TRP (Transmission Reception Point), a cluster head, an access point, an RRH (Remote Radio Head), an eNodeB (eNB), a gNodeB (gNB), a BS (Base Station), a BTS (Base Transceiver Station), a parent device, a gateway, etc. In addition, in sidelink communication, a base station may be a terminal instead of a base station. It may also be a relay device that relays communication between an upper node and a terminal.

[0211] (Uplink / Downlink / Sidelink) The present disclosure may be applied to any of the uplink, downlink, and sidelink. For example, the present disclosure may be applied to the uplink Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH), and Physical Random Access Channel (PRACH), the downlink Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), and PBCH, and the sidelink PSSCH, PSCCH, and PSBCH. The PSCCH and PSSCH are examples of a sidelink control channel and a sidelink data channel, respectively. The PBCH and PSBCH are examples of a broadcast channel.

[0212] (Data channel / Control channel) The present disclosure may be applied to both data channels and control channels. For example, the channels of the present disclosure may be replaced with data channels such as PDSCH, PUSCH, and PSSCH, and control channels such as PDCCH, PUCCH, PBCH, PSCCH, and PSBCH.

[0213] (reference signal) In the present disclosure, a reference signal is a signal known by both a base station and a terminal, and may also be referred to as an RS (Reference Signal) or a pilot signal. The reference signal may be a DMRS, a CSI-RS (Channel State Information - Reference Signal), a TRS (Tracking Reference Signal), a PTRS (Phase Tracking Reference Signal), a CRS (Cell-specific Reference Signal), or an SRS (Sounding Reference Signal).

[0214] (time interval) In the above embodiments, the unit of time resource is not limited to one or a combination of slots and symbols, but may be, for example, a time resource unit such as a frame, a superframe, a subframe, a slot, a time slot subslot, a minislot, or a symbol, an OFDM (Orthogonal Frequency Division Multiplexing) symbol, or an SC-FDMA (Single Carrier-Frequency Division Multiplexing) symbol, or another time resource unit. Furthermore, the number of symbols included in one slot is not limited to the number of symbols exemplified in the above embodiments, and may be another number of symbols.

[0215] (frequency band) The present disclosure may be applied to both licensed and unlicensed bands.

[0216] (communication) The present disclosure may be applied to any of communication between a base station and a terminal, communication between terminals (Sidelink communication, Uu link communication), and V2X (Vehicle to Everything) communication. For example, the channels of the present disclosure may be replaced with PSCCH, PSSCH, PSFCH, PSBCH, PDCCH, PUCCH, PDSCH, PUSCH, and PBCH.

[0217] The present disclosure may be applied to any of terrestrial networks and non-terrestrial networks (NTN: Non-Terrestrial Networks) using satellites or highly advanced pseudo satellites (HAPS).The present disclosure may also be applied to terrestrial networks in which the transmission delay is large compared to the symbol length or slot length, such as networks with large cell sizes and ultra-wideband transmission networks.

[0218] <5G NR system architecture and protocol stack> 3GPP is working on the next release of fifth-generation cellular technology (also known as 5G), which includes the development of New Radio Access Technology (NR) operating in the frequency range up to 100 GHz. The first version of the 5G standard was completed at the end of 2017, allowing for the prototyping and commercial deployment of 5G NR compliant devices (e.g., smartphones).

[0219] For example, the system architecture assumes a Next Generation - Radio Access Network (NG-RAN) with gNBs. The gNBs provide UE-side termination of NG radio access user plane (SDAP / PDCP / RLC / MAC / PHY) and control plane (RRC) protocols. The gNBs are connected to each other via an Xn interface. The gNBs are also connected to a Next Generation Core (NGC) via a Next Generation (NG) interface, more specifically to an Access and Mobility Management Function (AMF) (e.g., a specific core entity that performs AMF) via an NG-C interface, and to a User Plane Function (UPF) (e.g., a specific core entity that performs UPF) via an NG-U interface. The NG-RAN architecture is shown in Figure 17 (see, for example, 3GPP TS 38.300 v15.6.0, section 4).

[0220] The NR user plane protocol stack (see, for example, 3GPP TS 38.300, section 4.4.1) includes the Packet Data Convergence Protocol (PDCP) sublayer (see, for example, TS 38.300, section 6.4), the Radio Link Control (RLC) sublayer (see, for example, TS 38.300, section 6.3), and the Medium Access Control (MAC) sublayer (see, for example, TS 38.300, section 6.2), which are terminated on the network side at the gNB. A new Access Stratum (AS) sublayer (Service Data Adaptation Protocol (SDAP)) has also been introduced on top of PDCP (see, for example, 3GPP TS 38.300, section 6.5). A control plane protocol stack has also been defined for NR (see, for example, TS 38.300, section 4.4.2). An overview of Layer 2 functions is given in Section 6 of TS 38.300. The functions of the PDCP sublayer, RLC sublayer, and MAC sublayer are listed in clauses 6.4, 6.3, and 6.2 of TS 38.300, respectively. The functions of the RRC layer are listed in clause 7 of TS 38.300.

[0221] For example, the Medium-Access-Control layer handles logical channel multiplexing and scheduling and scheduling-related functions, including handling various numerologies.

[0222] For example, the physical layer (PHY) is responsible for coding, PHY HARQ processing, modulation, multi-antenna processing, and mapping of signals to appropriate physical time-frequency resources. The physical layer also handles mapping of transport channels to physical channels. The physical layer provides services to the MAC layer in the form of transport channels. A physical channel corresponds to a set of time-frequency resources used for transmitting a specific transport channel, and each transport channel is mapped to a corresponding physical channel. For example, physical channels include the Physical Random Access Channel (PRACH), the Physical Uplink Shared Channel (PUSCH), and the Physical Uplink Control Channel (PUCCH) as uplink physical channels, and the Physical Downlink Shared Channel (PDSCH), the Physical Downlink Control Channel (PDCCH), and the Physical Broadcast Channel (PBCH) as downlink physical channels.

[0223] NR use cases / deployment scenarios may include enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine-type communication (mMTC), which have diverse requirements in terms of data rate, latency, and coverage. For example, eMBB is expected to support peak data rates (20 Gbps in the downlink and 10 Gbps in the uplink) and effective (user-experienced) data rates that are approximately three times higher than those offered by IMT-Advanced. On the other hand, URLLC imposes stricter requirements for ultra-low latency (0.5 ms user-plane latency for UL and DL, respectively) and high reliability (1-10-5 within 1 ms). Finally, mMTC preferably requires high connection density (1,000,000 devices / km in urban environments). 2 ), wide coverage in adverse environments, and extremely long battery life (15 years) for low-cost devices may be desired.

[0224] Therefore, OFDM numerology (e.g., subcarrier spacing, OFDM symbol length, cyclic prefix (CP) length, number of symbols per scheduling interval) suitable for one use case may not be valid for another use case. For example, low-latency services may preferably require a shorter symbol length (and therefore a larger subcarrier spacing) and / or fewer symbols per scheduling interval (also referred to as TTI) than mMTC services. Furthermore, deployment scenarios with large channel delay spreads may preferably require a longer CP length than scenarios with small delay spreads. Subcarrier spacing may be optimized accordingly to maintain similar CP overhead. NR may support one or more subcarrier spacing values. Correspondingly, subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, etc. are currently considered. The symbol length Tu and subcarrier spacing Δf are directly related by the equation Δf = 1 / Tu. Similar to LTE systems, the term "resource element" can be used to mean the smallest resource unit consisting of one subcarrier for the length of one OFDM / SC-FDMA symbol.

[0225] In the new radio system 5G-NR, a resource grid of subcarriers and OFDM symbols is defined for each numerology and each carrier in the uplink and downlink. Each element of the resource grid is called a resource element and is specified based on a frequency index in the frequency domain and a symbol position in the time domain (see 3GPP TS 38.211 v15.6.0).

[0226] <Functional separation between NG-RAN and 5GC in 5G NR> Figure 18 shows the functional separation between NG-RAN and 5GC. The logical node of NG-RAN is gNB or ng-eNB. 5GC has logical nodes AMF, UPF, and SMF.

[0227] For example, the gNB and ng-eNB host the following main functions: - Radio Resource Management functions such as Radio Bearer Control, Radio Admission Control, Connection Mobility Control, dynamic allocation (scheduling) of resources to UEs in both uplink and downlink; - IP header compression, encryption, and integrity protection of data; - AMF selection at UE attach time if routing to the AMF cannot be determined from the information provided by the UE; - Routing of user plane data towards UPF; - Routing of control plane information towards AMF; - Setting up and tearing down connections; - scheduling and sending of paging messages; - Scheduling and transmission of system broadcast information (originating from AMF or Operation, Admission, Maintenance (OAM) Function); - Configuring measurements and measurement reporting for mobility and scheduling; - Transport level packet marking in the uplink; - Session management; - Network slicing support; - QoS flow management and mapping to data radio bearers; - Support for UEs in RRC_INACTIVE state; - NAS message delivery function; - Sharing of radio access networks; - Dual connectivity; - Close cooperation between NR and E-UTRA.

[0228] The Access and Mobility Management Function (AMF) hosts the following main functions: - Ability to terminate Non-Access Stratum (NAS) signaling; - NAS signaling security; - Access Stratum (AS) security control; - 3GPP Core Network (CN) inter-node signaling for mobility between access networks; - Reachability to idle mode UEs (including control and execution of paging retransmissions); - Managing the registration area; - Support for intra-system and inter-system mobility; - Access authentication; - Access authorization, including checking roaming privileges; - Mobility management control (subscription and policy); - Network slicing support; - Selection of Session Management Function (SMF).

[0229] Additionally, the User Plane Function (UPF) hosts the following main functions: - Anchor points for intra-RAT / inter-RAT mobility (if applicable); - External PDU (Protocol Data Unit) session points for interconnection with data networks; - Packet routing and forwarding; - Packet inspection and policy rule enforcement for the user plane part; - Traffic usage reporting; - uplink classifier to support routing of traffic flows to the data network; - Branching Point for supporting multi-homed PDU sessions; - QoS processing for the user plane (e.g., packet filtering, gating, UL / DL rate enforcement); - Verification of uplink traffic (mapping to QoS flows of SDFs); - Downlink packet buffering and triggering function for downlink data notification.

[0230] Finally, the Session Management Function (SMF) hosts the following main functions: - Session management; - IP address allocation and management for the UE; - Selection and control of the UPF; - Traffic steering setting function in the User Plane Function (UPF) for routing traffic to the appropriate destination; - Enforcement of control plane policies and QoS; - Notification of downlink data.

[0231] <Procedures for RRC connection setup and reconfiguration> Figure 19 shows some of the interactions between the UE, gNB, and AMF (5GC entity) when the UE transitions from RRC_IDLE to RRC_CONNECTED in the NAS part (see TS 38.300 v15.6.0).

[0232] RRC is a higher layer signaling protocol used to configure the UE and the gNB. With this transition, the AMF prepares UE context data (including, for example, PDU session context, security keys, UE radio capabilities, and UE security capabilities) and sends it to the gNB with an INITIAL CONTEXT SETUP REQUEST. The gNB then activates AS security together with the UE. This is done by the gNB sending a SecurityModeCommand message to the UE, and the UE responding with a SecurityModeComplete message to the gNB. The gNB then sends an RRCReconfiguration message to the UE, and upon receiving an RRCReconfigurationComplete message from the UE, the gNB reconfigures the UE to set up a Signaling Radio Bearer 2 (SRB2) and a Data Radio Bearer (DRB). For signaling-only connections, the RRCReconfiguration steps are omitted because SRB2 and DRB are not set up. Finally, the gNB notifies the AMF that the setup procedure is complete with an INITIAL CONTEXT SETUP RESPONSE.

[0233] Therefore, the present disclosure provides a 5th Generation Core (5GC) entity (e.g., AMF, SMF, etc.) that includes: control circuitry that, in operation, establishes a Next Generation (NG) connection with a gNodeB; and a transmitter that, in operation, transmits an initial context setup message to the gNodeB via the NG connection so that a signaling radio bearer between the gNodeB and a user equipment (UE) is set up. Specifically, the gNodeB transmits Radio Resource Control (RRC) signaling that includes a resource allocation configuration information element (IE) to the UE via the signaling radio bearer. Then, the UE performs uplink transmission or downlink reception based on the resource allocation configuration.

[0234] <IMT usage scenarios from 2020 onwards> Figure 20 illustrates some use cases for 5G NR. The 3rd Generation Partnership Project New Radio (3GPP NR) is considering three use cases envisioned by IMT-2020 to support a wide variety of services and applications. The first phase of specifications for enhanced mobile broadband (eMBB) has been completed. Current and future work includes standardization for ultra-reliable and low-latency communications (URLLC) and massive machine-type communications (mMTC), in addition to expanding support for eMBB. Figure 20 illustrates some example use scenarios envisioned for IMT beyond 2020 (see, for example, ITU-R M.2083 Figure 2).

[0235] URLLC use cases have stringent performance requirements, such as throughput, latency, and availability. URLLC use cases are envisioned as one of the enabling technologies for future applications, such as wireless control of industrial production or manufacturing processes, remote medical surgery, automated power transmission and distribution in smart grids, and road safety. URLLC's ultra-high reliability is supported by identifying technologies that meet the requirements set by TR 38.913. Key requirements for NR URLLC in Release 15 include a target user plane latency of 0.5 ms on the uplink (UL) and 0.5 ms on the downlink (DL). The overall URLLC requirement for a single packet transmission is a block error rate (BLER) of 1E-5 for a 32-byte packet size at a user plane latency of 1 ms.

[0236] From a physical layer perspective, reliability can be improved in many possible ways. Current reliability improvement room includes defining a separate CQI table for URLLC, more compact DCI formats, PDCCH repetition, etc. However, this room can be expanded to achieve ultra-high reliability as NR (with respect to the key requirements of NR URLLC) becomes more stable and developed. Specific use cases for NR URLLC in Release 15 include augmented reality / virtual reality (AR / VR), e-health, e-safety, and mission-critical applications.

[0237] Additionally, technology enhancements targeted by NR URLLC aim to improve latency and reliability. Technology enhancements for latency improvement include configurable numerology, non-slot-based scheduling with flexible mapping, grant-free (configured grant) uplink, slot-level repetition in the data channel, and preemption in the downlink. Preemption means that a transmission with previously allocated resources is stopped and the allocated resources are used for another transmission with a later requested lower latency / higher priority requirement. Thus, a previously allowed transmission is preempted by a later transmission. Preemption is applicable regardless of the specific service type. For example, a transmission of service type A (URLLC) may be preempted by a transmission of service type B (eMBB, etc.). Technology enhancements for reliability improvement include dedicated CQI / MCS tables for a target BLER of 1E-5.

[0238] The use case for massive machine-type communication (mMTC) is characterized by a very large number of connected devices that typically transmit relatively small amounts of data that are not sensitive to latency. These devices are required to be low cost and have very long battery life. From an NR perspective, using very narrow bandwidth portions is one solution that saves power and allows for long battery life from the UE perspective.

[0239] As mentioned above, the scope of reliability improvement in NR is expected to be broader. One of the key requirements for all cases, for example for URLLC and mMTC, is high or ultra-high reliability. Several mechanisms can improve reliability from a radio perspective and a network perspective. Generally, there are two to three key areas that can help improve reliability. These areas include compact control channel information, data channel / control channel repetition, and diversity in the frequency, time, and / or spatial domains. These areas are generally applicable to reliability improvement regardless of the specific communication scenario.

[0240] For NR URLLC, further use cases with more stringent requirements are envisioned, such as factory automation, transportation, and power distribution: high reliability (up to 10-6 level), high availability, packet sizes up to 256 bytes, and time synchronization down to a few μs (depending on the use case, the value can be 1 μs or a few μs depending on the frequency range and low latency in the 0.5 ms to 1 ms range (e.g., 0.5 ms latency on the targeted user plane)).

[0241] Furthermore, for NR URLLC, several technical enhancements may be available from the perspective of the physical layer. These technical enhancements include enhancements to the Physical Downlink Control Channel (PDCCH) related to compact DCI, repetition of the PDCCH, and increased monitoring of the PDCCH. Also, the enhancement of UCI (Uplink Control Information) is related to the enhancement of enhanced HARQ (Hybrid Automatic Repeat Request) and CSI feedback. In addition, there may be enhancements to the Physical Uplink Shared Channel (PUSCH) related to mini-slot level hopping, and enhancements to retransmission / repetition. The term "mini-slot" refers to a Transmission Time Interval (TTI) that contains fewer symbols than a slot (a slot has 14 symbols).

[0242] <QoS Control> The QoS (Quality of Service) model of 5G is based on QoS flows and supports both QoS flows that require a guaranteed flow bit rate (GBR: Guaranteed Bit Rate QoS flows) and QoS flows that do not require a guaranteed flow bit rate (non-GBR QoS flows). Therefore, at the NAS level, a QoS flow is the finest granularity QoS differentiation in a PDU session. A QoS flow is identified within a PDU session by a QoS Flow ID (QFI: QoS Flow ID) that is carried in an encapsulation header via the NG-U interface.

[0243] For each UE, the 5GC establishes one or more PDU sessions. For each UE, the NG-RAN establishes at least one Data Radio Bearer (DRB) for each PDU session, e.g., as shown above with reference to Figure 19. Additional DRBs for the QoS flows of that PDU session can be configured later (when this is up to the NG-RAN). The NG-RAN maps packets belonging to different PDU sessions to different DRBs. NAS-level packet filters in the UE and the 5GC associate UL packets and DL packets with QoS flows, while AS-level mapping rules in the UE and the NG-RAN associate UL QoS flows and DL QoS flows with DRBs.

[0244] Figure 21 shows the non-roaming reference architecture for 5G NR (see TS 23.501 v16.1.0, section 4.23). An Application Function (AF) (e.g., an external application server hosting 5G services, as illustrated in Figure 20) interacts with the 3GPP core network to provide services. For example, it accesses a Network Exposure Function (NEF) to support applications that affect traffic routing, or interacts with a policy framework (see Policy Control Function (PCF)) for policy control (e.g., QoS control). Based on the operator's deployment, Application Functions that are considered trusted by the operator can interact directly with the relevant Network Functions. Application Functions that are not authorized by the operator to directly access Network Functions interact with the relevant Network Functions using an external exposure framework via the NEF.

[0245] Figure 21 further illustrates further functional units of the 5G architecture, namely, Network Slice Selection Function (NSSF), Network Repository Function (NRF), Unified Data Management (UDM), Authentication Server Function (AUSF), Access and Mobility Management Function (AMF), Session Management Function (SMF), and Data Network (DN, e.g., operator-provided services, Internet access, or third-party services). All or part of the core network functions and application services may be deployed and run in a cloud computing environment.

[0246] Therefore, the present disclosure provides an application server (e.g., an AF in a 5G architecture) comprising: a transmitter that, in operation, sends a request including QoS requirements for at least one of a URLLC service, an eMMB service, and an mMTC service to at least one of 5GC functions (e.g., an NEF, an AMF, an SMF, a PCF, an UPF, etc.) to establish a PDU session including a radio bearer between a gNodeB and a UE according to the QoS requirements; and a control circuit that, in operation, performs a service using the established PDU session.

[0247] The present disclosure can be realized by software, hardware, or software in conjunction with hardware. Each functional block described in the above embodiments may be partially or entirely realized as an LSI, which is an integrated circuit. Each process described in the above embodiments may be partially or entirely controlled by a single LSI or a combination of LSIs. An LSI may be composed of individual chips, or may be composed of a single chip that includes some or all of the functional blocks. An LSI may have data inputs and outputs. Depending on the level of integration, an LSI may be referred to as an IC, system LSI, super LSI, or ultra LSI. The integration method is not limited to LSIs; it may also be realized by dedicated circuits, general-purpose processors, or dedicated processors. Furthermore, a field programmable gate array (FPGA), which can be programmed after LSI fabrication, or a reconfigurable processor, which allows the connections and settings of circuit cells within an LSI to be reconfigured, may also be used. The present disclosure may be realized as digital or analog processing. Furthermore, if an integrated circuit technology that can replace LSI emerges due to advances in semiconductor technology or other derivative technologies, it is natural that such technology can be used to integrate functional blocks. The application of biotechnology is also a possibility.

[0248] The present disclosure may be implemented in any type of apparatus, device, or system (collectively referred to as a communications apparatus) that has a communications function. The communications apparatus may include a wireless transceiver and processing / control circuitry. The wireless transceiver may include a receiver and a transmitter, or both functions. The wireless transceiver (transmitter and receiver) may include a radio frequency (RF) module and one or more antennas. The RF module may include an amplifier, an RF modulator / demodulator, or the like. Non-limiting examples of communication devices include telephones (e.g., cell phones, smartphones), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks), cameras (e.g., digital still / video cameras), digital players (e.g., digital audio / video players), wearable devices (e.g., wearable cameras, smartwatches, tracking devices), game consoles, digital book readers, telehealth / telemedicine devices, communication-enabled vehicles or mobile transportation (e.g., cars, airplanes, ships), and combinations of the above devices.

[0249] Communications equipment is not limited to portable or mobile equipment, but also includes non-portable or fixed equipment, devices, and systems of any kind, such as smart home devices (such as appliances, lighting equipment, smart meters or metering devices, control panels, etc.), vending machines, and any other "things" that may exist on an IoT (Internet of Things) network.

[0250] Communications include data communications via cellular systems, wireless LAN systems, communications satellite systems, etc., as well as data communications via combinations of these.

[0251] A communications apparatus also includes devices such as controllers and sensors connected or coupled to a communications device that performs the communications functions described in this disclosure, such as controllers and sensors that generate control and data signals used by the communications device to perform the communications functions of the communications apparatus.

[0252] The communication apparatus also includes infrastructure facilities, such as base stations, access points, and any other apparatus, device, or system that communicates with or controls the various apparatuses listed above, but are not limited to these.

[0253] A terminal according to an embodiment of the present disclosure may include a control circuit for generating information regarding cooperative use of side link resources between terminals, and a transmission circuit for transmitting the information to other terminals.

[0254] In one embodiment of the present disclosure, the information may include at least one of information on resources that the other terminal plans to transmit from, information on resources that the transmitting circuit plans to transmit from, information on resources that are recommended for use by the other terminal, and information on resources that are not recommended for use by the other terminal.

[0255] In one embodiment of the present disclosure, the control circuitry may not cause the transmitting circuitry to transmit on resources indicated as available by the information.

[0256] In one embodiment of the present disclosure, the control circuitry may place the information on a sidelink data channel, and the transmission circuitry may transmit sidelink control information to the other terminal indicating that the information is to be transmitted on the sidelink data channel.

[0257] In one embodiment of the present disclosure, the control circuitry may place the information in second SL control information, and the transmission circuitry may transmit the second SL control information or the first SL control information to the other terminal, the second SL control information indicating that the information is transmitted in the second SL control information.

[0258] In one embodiment of the present disclosure, the control circuitry may place the information on a sidelink feedback channel, and the transmission of the information on the feedback channel may be scheduled based on prior communication with the other terminal.

[0259] In an embodiment of the present disclosure, the control circuitry may place the information in first sidelink control information, and include in the first sidelink control information resource allocation information for a terminal other than the terminal from which the first sidelink control information is transmitted.

[0260] A terminal according to an embodiment of the present disclosure may include a receiving circuit for receiving information regarding inter-terminal cooperative use of sidelink resources from other terminals, and a control circuit for determining resources for transmission in the sidelink based on the information.

[0261] In a sidelink communication control method according to one embodiment of the present disclosure, a first terminal transmits information regarding inter-terminal cooperative use of sidelink resources, and a second terminal receiving the information may determine resources to transmit on the sidelink based on the information.

[0262] The disclosures of the specification, drawings and abstract contained in Japanese Patent Application No. 2020-134851, filed on August 7, 2020, are incorporated herein by reference in their entirety. [Industrial Applicability]

[0263] One embodiment of the present disclosure is useful in wireless communication systems. [Explanation of symbols]

[0264] 100 base stations 101 Resource usage adjustment information setting unit 103 Error correction coding unit 104 Modulation section 106 Transmitter 107 Receiving unit 109 Demodulation section 110 Error correction decoding unit 200 devices 201 Receiving unit 202 Signal separation section 203 Demodulation section 203-1 Uu demodulation unit 203-2 SL demodulation section 204 Error correction decoding unit 204-1 Uu error correction decoding unit 204-2 SL error correction decoding unit 205 Resource Use Adjustment Information Receiving Unit 206 Resource use adjustment information generation unit 207 Error correction coding unit 207-1 Uu error correction coding section 207-2 SL error correction coding section 208 Modulation section 208-1 Uu modulation section 208-2 SL modulation section 209 Signal Allocation Unit 210 Transmitter 211-1 1st stage SCI receiver 211-2 2nd stage SCI receiver 212-1 1st stage SCI generation section 212-2 2nd stage SCI generation section

Claims

1. a circuit for generating information regarding cooperative use of side link resources between terminals; a transceiver configured to transmit second sidelink control information including the information to another terminal; Equipped with the second sidelink control information and the third sidelink control information not including the second sidelink control information are transmitted on a data channel; and and transmitting, to the other terminal, first sidelink control information indicating one of the second sidelink control information and the third sidelink control information. Terminal.

2. The information includes at least one of information on resources that the other terminal plans to transmit, information on resources that the transceiver plans to transmit, information on resources that are recommended for use by the other terminal, and information on resources that are not recommended for use by the other terminal. The terminal according to claim 1 .

3. the circuitry prevents the transceiver from transmitting on resources indicated as available by the information. The terminal according to claim 1 .

4. the circuitry places the information on a sidelink data channel; the transceiver transmits sidelink control information to the other terminals, indicating that the information is to be transmitted on a sidelink data channel. The terminal according to claim 1 .

5. the second sidelink control information includes an identifier of the other terminal; The terminal according to claim 1 .

6. the circuitry places the information in a sidelink feedback channel; The information is scheduled to be transmitted on the feedback channel based on prior communication with the other terminal. The terminal according to claim 1 .

7. The resources used by the other terminals are set in slot units. The terminal according to claim 1 .

8. a transceiver configured to receive second sidelink control information from another terminal, the second sidelink control information including information regarding cooperative use of sidelink resources between terminals; a circuit for determining resources for transmission on the sidelink based on the information; Equipped with the second sidelink control information and the third sidelink control information not including the second sidelink control information are transmitted on a data channel; and the transceiver receives, from the other terminal, first sidelink control information indicating one of the second sidelink control information and the third sidelink control information; Terminal.

9. the first terminal transmits second sidelink control information including information regarding cooperative use of sidelink resources; The second terminal that has received the information determines resources for transmission on the sidelink based on the information; the second sidelink control information and the third sidelink control information not including the second sidelink control information are transmitted on a data channel; and the first terminal transmits, to the second terminal, first side link control information indicating one of the second side link control information and the third side link control information; A sidelink communication control method.

10. generating information regarding cooperative use of side link resources between terminals; transmitting second sidelink control information including the information to another terminal; Including, the second sidelink control information and the third sidelink control information not including the second sidelink control information are transmitted on a data channel; and transmitting first sidelink control information indicating one of the second sidelink control information and the third sidelink control information to the other terminal; Communication method.

11. receiving second sidelink control information from another terminal, the second sidelink control information including information regarding cooperative use of sidelink resources between terminals; determining resources for sidelink transmission based on the information; Including, the second sidelink control information and the third sidelink control information not including the second sidelink control information are transmitted on a data channel; and receiving, from the other terminal, first sidelink control information indicating one of the second sidelink control information and the third sidelink control information; Communication method.

12. An integrated circuit that controls processing of a terminal, the processing comprising: generating information regarding cooperative use of side link resources between terminals; transmitting second sidelink control information including the information to another terminal; Including, the second sidelink control information and the third sidelink control information not including the second sidelink control information are transmitted on a data channel; and transmitting first sidelink control information indicating one of the second sidelink control information and the third sidelink control information to the other terminal; Integrated circuit.

13. An integrated circuit that controls processing of a terminal, the processing comprising: receiving second sidelink control information from another terminal, the second sidelink control information including information regarding inter-terminal cooperative use of sidelink resources; determining resources for sidelink transmission based on the information; Including, the second sidelink control information and the third sidelink control information not including the second sidelink control information are transmitted on a data channel; and receiving, from the other terminal, first sidelink control information indicating one of the second sidelink control information and the third sidelink control information; Integrated circuit.

Images