Terminal, side-link communication control method and integrated circuit

Abstract

This invention improves the communication performance of a side link. A terminal (200) includes: a control circuit (20A) that generates information related to the coordinated use of side link resources between terminals; and a transmission circuit (20B) that transmits the generated information to other terminals.

Description

Technical Field

[0001] This disclosure relates to terminal and sidelink communication control methods. Background Technology

[0002] A communication system known as "fifth-generation mobile communication system (5G)" has been developed. As an international standards organization, the 3rd Generation Partnership Project (3GPP) has studied the advancement of 5G communication systems from two aspects: the advancement of LTE (Long Term Evolution) / LTE-Advanced systems and new approaches that may not be backward compatible with LTE / LTE-Advanced systems, namely New Radio Access Technology (also known as "New RAT" or "NR") (see, for example, Non-Patent Document 1).

[0003] In addition, 3GPP has already studied supporting V2X (vehicle-to-X) in LTE systems. Support for V2X has also been studied in NR, which can utilize a wider frequency band. Furthermore, beyond V2X, further extensions using sidelink (SL) communication have also been investigated.

[0004] Existing technical documents

[0005] Non-patent literature

[0006] Non-patent literature 1: 3GPP TR 38.885V16.0.0, Study on NR Vehicle-to-Everything (V2X) (Release 16), 2019-03

[0007] Non-patent literature 2: RP-201385, “WID revision: NR sidelink enhancement”, LGEelectronics, 3GPP TSG RAN Meeting #88e, Electronic Meeting, June 29 - July 3, 2020 Summary of the Invention

[0008] However, there is still room for further research into improving the communication performance of sidelinks (e.g., reliability, low latency, and power consumption reduction).

[0009] The non-limiting embodiments disclosed herein help to provide terminals and sidelink communication control methods that can improve the communication performance of sidelinks.

[0010] One embodiment of the present disclosure includes a terminal comprising: a control circuit for generating information related to the coordinated use of sidelink resources between terminals; and a transmission circuit for transmitting the information to other terminals.

[0011] It should be noted that these general or specific methods can be implemented by systems, devices, methods, integrated circuits, computer programs or recording media, or by any combination of systems, devices, methods, integrated circuits, computer programs and recording media.

[0012] According to one embodiment of this disclosure, the communication performance of the side link can be improved.

[0013] Further advantages and effects of one embodiment of this disclosure will be illustrated by the specification and drawings. These advantages and / or effects are provided by the various embodiments and the features described in the specification and drawings, but not necessarily all of them need to be provided in order to obtain one or more of the same features. Attached Figure Description

[0014] Figure 1 This is a diagram illustrating an example of channel configuration within a time slot of a side link.

[0015] Figure 2 This is a block diagram representing a structural example of a part of a terminal.

[0016] Figure 3 This is a block diagram representing a structural example of a base station.

[0017] Figure 4 This is a block diagram representing a structural example of a terminal.

[0018] Figure 5 This is a flowchart representing an example of a terminal's (sending) action.

[0019] Figure 6 This is a flowchart illustrating an example of a terminal's (receiving) action.

[0020] Figure 7 This is a block diagram representing other structural examples of the terminal.

[0021] Figure 8 This is a diagram illustrating an example of sending resource utilization adjustment information 1.

[0022] Figure 9 This is a diagram representing other examples of sending resource utilization adjustment information 1.

[0023] Figure 10 This is a diagram illustrating an example of sending resource utilization adjustment information 3.

[0024] Figure 11 This is a diagram illustrating an example of sending resource utilization adjustment information 4.

[0025] Figure 12 This is a diagram illustrating Example 1 of PSSCH (physical SL shared channel) operation.

[0026] Figure 13 This is a diagram showing a variation of PSSCH action example 1.

[0027] Figure 14 This is a diagram illustrating an example of setting up a new channel for adjusting resource utilization information.

[0028] Figure 15 This is a diagram illustrating Example 1 of the first-stage SCI (Sidelink Control Information) action.

[0029] Figure 16 This is a diagram representing Example 2 of the first stage of SCI action.

[0030] Figure 17 This is a diagram illustrating the exemplary architecture of a 3GPP NR system.

[0031] Figure 18 This is a schematic diagram illustrating the functional separation between NG-RAN (Next Generation-Radio Access Network) and 5GC (5th Generation Core).

[0032] Figure 19 This is a sequence diagram of the setting / resetting process for an RRC (Radio Resource Control) connection.

[0033] Figure 20 This is a schematic diagram illustrating the application scenarios of high-capacity high-speed communication (eMBB), massive machine-type communications (mMTC), and ultra-reliable and low-latency communications (URLLC).

[0034] Figure 21This is a block diagram representing an exemplary 5G system architecture for non-roaming scenarios. Detailed Implementation

[0035] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0036] [V2X Explanation]

[0037] V2X envisions communication between vehicles (V2V), between vehicles and infrastructure (V2I), between vehicles and pedestrians (V2P), and between vehicles and the network (V2N). In V2V, V2I, and V2P, communication can occur directly between terminals (e.g., at least one of sending and receiving) without traversing the network between the terminal and the base station using a sidelink (SL) or a link referred to as "PC5". In V2N, communication is envisioned via a link referred to as "Uu" between the terminal and the base station (e.g., a gNB in ​​NR and an eNB in ​​LTE).

[0038] For example, resources for sidelinks are configured based on the SL BWP (Band Width Part) and the resource pool. The SL BWP specifies the frequency band that can be used for sidelinks and can be configured differently from the DL BWP or UL BWP configured for base station-to-terminal (Uu) connections. The frequency band may also overlap with the UL BWP.

[0039] A resource pool may contain, for example, resources in the specified frequency and time directions within the SL BWP. Multiple resource pools can also be configured for a single terminal. Frequency resources within a resource pool can be divided into sub-channel units, and resource allocation can be configured on a sub-channel basis. Each sub-channel can contain multiple PRBs (Physical Resource Blocks).

[0040] [Explanation of Side Links in NR]

[0041] In NR's V2X, communication in the side link (e.g., at least one of sending and receiving) is studied to support unicast, groupcast, and broadcast.

[0042] Unicast, for example, envisions a one-to-one transmission from a sending terminal (e.g., also referred to as a "transmitter UE" or "Tx UE") to a receiving terminal (e.g., a receiver UE or Rx UE). Multicast, for example, envisions a transmission from a sending terminal to multiple receiving terminals contained in a group. Broadcast, for example, envisions a transmission from a sending terminal to an unspecified number of receiving terminals. Furthermore, UE is an abbreviation for User Equipment and is an example of a "terminal".

[0043] [SL Channel Description]

[0044] In NR's SL, the configuration of channels such as PSCCH (physical SL control channel), PSSCH (physical SL shared channel), PSFCH (physical SL feedback channel), and PSBCH (physical SL broadcast channel) is studied.

[0045] PSCCH is an example of a control channel in SL, and PSSCH is an example of a data channel in SL. PSFCH is an example of a channel in SL used to transmit feedback signals, and PSBCH is an example of a broadcast channel used in transmissions where the receiving terminal is uncertain. Furthermore, in the following description, "signal" and "information" can be used interchangeably depending on the context.

[0046] The PSCCH may contain, for example, a control signal (or control information) referred to as "sidelink control information (SCI)". The SCI may contain, for example, information (or parameters) related to at least one of the transmission and reception of the PSSCH, such as resource allocation information for data signals (e.g., PSSCH).

[0047] As described later, the information content of an SCI can be segmented (or divided or classified) into first information (or control information) and second information (or control information). In other words, an SCI can, for example, contain "first control information" and "second control information" related to an SL. "Second control information" can also be considered as an example of information associated with "first control information." "First control information" and "second control information" can, for example, be referred to as "first-stage SCI" and "second-stage (2nd stage) SCI," respectively.

[0048] This could be an example where the first-stage SCI is configured on the control channel of the SL, namely the PSCCH, and the second-stage SCI is configured on the data channel of the SL, namely the PSSCH. In other words, the SCI can be configured distributed across the PSCCH and PSSCH. Furthermore, for those skilled in the art, the term "configuration" can be used interchangeably with other appropriate terms such as "mapping," "assignment," or "(mapping) mode" (the same applies hereinafter).

[0049] For example, data signals, or data signals and SCI (e.g., second-stage SCI) are configured in PSSCH.

[0050] For example, feedback signals for PSSCH (e.g., data signals) (e.g., hybrid automatic repeat request (HARQ) feedback) are configured in PSFCH. These feedback signals may include, for example, response signals indicating ACK (Acknowledgement) or NACK (Negative Acknowledgement) (e.g., also referred to as "ACK / NACK information" or "HARQ-ACK").

[0051] Imagine that the feedback signal is used, for example, in the case of sending and receiving PSSCH via unicast and multicast. ACK and NACK can also be referred to as "HARQ-ACK" and "HARQ-NACK", respectively.

[0052] For example, it is uncertain whether the broadcast signal of the receiving terminal is configured in the PSBCH. The PSBCH is transmitted together with the signals used for synchronization, namely the sidelink primary synchronization signal (S-PSS) and the sidelink secondly synchronization signal (S-SSS), and is also collectively referred to as "S-SSB (sidelink synchronization signal block)".

[0053] [Explanation of SCI]

[0054] A non-limiting example of the information contained in the first-stage SCI and the second-stage SCI is described below.

[0055] <Phase 1 SCI>

[0056] Priority - 3 bits

[0057] Frequency resource allocation

[0058] Time resource assignment - 5 bits or 9 bits

[0059] -Resource reservation period - [log2(N_(reservePeriod)] bits or 0 bits

[0060] -DMRS pattern[x] bits or 0 bits

[0061] - Second-stage SCI format 2 bits

[0062] - The beta_offset indicator is 2 bits.

[0063] - Number of DMRS ports (1 bit)

[0064] -Modulation and coding scheme -5 bits

[0065] -Additional MCS table indicator - 2 bits or 0 bits

[0066] -PSFCH overhead indication - 1 bit

[0067] -Reserved-[sl-NumReservedBits] bits or 0 bits

[0068] <Second Phase SCI>

[0069] In the second stage of SCI, for example, as described below, two formats can be prepared: SCI format 2-A and SCI format 2-B.

[0070] <SCI Format 2-A>

[0071] -HARQ process number - [log_2(N_process)] bits

[0072] - New data indicator - 1 bit

[0073] Redundancy version - 2 bits

[0074] -Source ID -8 bits

[0075] Destination ID - 16 bits

[0076] -HARQ feedback enabled / disable indicator - 1 bit

[0077] - Communication type indicator - 2 bits

[0078] -CSI request-1 bit

[0079] <SCI Format 2-B>

[0080] -HARQ process number-[log_2(N_process)] bits

[0081] -New Data Indicator- 1 bit

[0082] -Redundant version-2 bits

[0083] -Source ID-8 bits

[0084] -Destination ID- 16 bits

[0085] -HARQ feedback enable / disable indicator- 1 bit

[0086] -Zone ID - 12 bits

[0087] -Communication range requirement - 4 bits

[0088] In V2X SL communication, a terminal determines the resources to transmit after sensing, for example, the resource utilization status (or agreed status) of other terminals. By splitting the SCI information content into two parts, the number of bits and size of the first-stage SCI can be reduced, thus reducing the area used for sensing. The first-stage SCI can be configured, for example, in the PSCCH, and the second-stage SCI can be configured, for example, in the PSSCH (or a part of the PSSCH). Furthermore, "DMRS" is an abbreviation for demodulation reference signal, and "CSI" is an abbreviation for channel state information.

[0089] Figure 1 This shows an example of the configuration of PSCCH, PSSCH, and PSFCH within a time slot. There are also cases where PSFCH is not configured depending on the settings. Furthermore, the number of symbols in PSSCH can be changed according to the settings. Additionally, for example, the configuration of the second-stage SCI can be changed based on the DMRS configuration in the PSSCH (not shown). For example, the first-stage SCI can be configured starting from a frequency resource lower than the frequency resource allocated for PSSCH. For example, time slot 1 consists of 14 symbols (or 12 symbols when using enhanced CP (Cyclic Prefix)).

[0090] [Explanation of SL mode]

[0091] SL communication has, for example, two modes (e.g., Mode 1 and Mode 2).

[0092] In Mode 1, for example, the base station decides (in other words, schedules) the resources (referred to as "SL resources") used by the terminal in the SL.

[0093] In Mode 2, for example, the terminal selects (or decides) resources for SL from a pre-defined resource pool. In other words, in Mode 2, the base station may not schedule SL resources.

[0094] Mode 1 envisions a scenario where the base station and terminal are already connected, i.e., a situation where 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 the resources used for SL even without instructions from the base station. Therefore, sidelink communication can be performed, for example, by terminals belonging to different operators or terminals outside coverage areas.

[0095] The above explains the side link.

[0096] <Overview of Communication Systems>

[0097] The communication system of this embodiment includes, for example, […]. Figure 2 The terminal 200 and the terminal 200 are illustrated. Figure 3 The example is base station 100. Although the number of terminals 200 can be more than one, in the case of sidelink communication, the number of terminals 200 is more than two.

[0098] Figure 2 This is a block diagram illustrating a structural example of a portion of the terminal 200 in an implementation method. Figure 2 The terminal 200 shown may include, for example, a control unit (or control circuit) 20A and a communication unit (or communication circuit) 20B.

[0099] From the perspective of the transmitting terminal 200 of the sidelink, the control unit 20A, for example, determines and generates information for adjusting (or coordinating control) the use (or utilization) of resources in sidelink communication between terminals 200. This information is an example of information related to the coordinated use of sidelink resources between terminals, and can be understood as a type of control information sent or received between terminals 200. Alternatively, for convenience, this information may also be referred to as "resource utilization adjustment information," "resource coordination control information," or "inter-UE coordinate information."

[0100] From the perspective of the transmitting terminal in the sidelink, the communication unit 20B sends resource utilization adjustment information to other terminals 200. Therefore, from the perspective of the transmitting terminal 200 in the sidelink, the communication unit 20B can be understood as an example of a transmitting circuit that sends resource utilization adjustment information. Furthermore, from the perspective of the receiving terminal 200 in the sidelink, the communication unit 20B receives resource utilization adjustment information sent by other terminals 200. Therefore, from the perspective of the receiving terminal 200, the communication unit 20B can be understood as an example of a receiving circuit that receives resource utilization adjustment information. Additionally, from the perspective of the receiving terminal in the sidelink, the control unit 20A determines the resources used for communication (e.g., transmission) in the sidelink based on the resource utilization adjustment information received by the communication unit 20B.

[0101] [Structure of Base Station 100]

[0102] Figure 3 This is a block diagram illustrating a structural example of a base station 100 according to an implementation method. For example... Figure 3 As illustrated, the base station 100 includes, for example, a resource utilization adjustment information setting unit 101, an error correction coding unit 103, a modulation unit 104, a transmitting unit 106, a receiving unit 107, a demodulation unit 109, and an error correction decoding unit 110.

[0103] The resource utilization adjustment information setting unit 101 determines whether to instruct the terminal 200 to send sidelink resource utilization adjustment information based on use cases omitted from the illustrations, or information reported by the terminal 200 such as the characteristics or capabilities of the terminal 200. If it has been decided that the terminal 200 should send sidelink resource utilization adjustment information, the resource utilization adjustment information setting unit 101 outputs information related to the transmission settings of the resource utilization adjustment information, for example, as signaling from a higher layer (e.g., RRC), to the error correction coding unit 103.

[0104] Furthermore, in this example, the resource utilization adjustment information setting unit 101 generates information to be sent at a higher layer (e.g., RRC) and sets the terminal 200 to send resource utilization adjustment information. However, this setting may be, for example, an application layer setting referred to as "pre-configured," or it may be preset in the SIM (Subscriber Identity Module), so that the terminal 200 can operate even without a setting from the base station 100.

[0105] The error correction coding unit 103 takes, for example, the transmit data signal (DL data signal) and the signaling from the higher layer as input, performs error correction coding on the input signal, and outputs the coded signal to the modulation unit 104.

[0106] The modulation unit 104 performs modulation processing on the signal input from the error correction coding unit 103, and outputs the modulated data signal to the transmission unit 106.

[0107] The transmitting unit 106 performs wireless transmission processing such as up-conversion and amplification on the signal input from the signal distribution unit 105, and transmits the wireless signal from the antenna to the terminal 200.

[0108] The receiving unit 107 receives signals transmitted from the terminal 200 in the antenna, performs wireless reception processing such as low-noise amplification and down-conversion, and outputs the received signal to the demodulation unit 109.

[0109] The demodulation unit 109 performs demodulation processing on the input signal, and outputs the obtained signal to the error correction decoding unit 110.

[0110] The error correction decoding unit 110 decodes the signal input from the demodulation unit 109, for example, to obtain the received data signal (UL data signal) from the terminal 200.

[0111] Furthermore, in Mode 1, the SCI information transmitted by terminal 200 in the sidelink can also be generated by base station 100 (e.g., resource utilization adjustment information setting unit 101 or other blocks not shown). The SCI information generated by base station 100 can be transmitted to terminal 200, for example, as a higher-layer signal or as a physical layer signal (e.g., PDCCH: Physical Downlink Control Channel).

[0112] [Structure of Terminal 200]

[0113] Figure 4 This is a block diagram illustrating a structural example of terminal 200 in an implementation scheme. In side-link communication, terminal 200 can be either a transmitting terminal or a receiving terminal. Figure 4 In this terminal 200, for example, a receiving unit 201, a signal separation unit 202, a demodulation unit 203, an error correction decoding unit 204, a resource utilization adjustment information receiving unit 205, a resource utilization adjustment information generating unit 206, an error correction coding unit 207, a modulation unit 208, a signal distribution unit 209, and a transmitting unit 210.

[0114] The receiving unit 201 receives the signal using an antenna, and after performing wireless receiving processing such as low-noise amplification and down-conversion on the received signal, outputs the signal to the signal separation unit 202.

[0115] The signal separation unit 202, for example, separates the received data signal and information representing the sensing result (hereinafter sometimes simply referred to as "sensing information") from the output signal of the receiving unit 201. For example, the received data signal is output to the demodulation unit 203. For example, the sensing information is output to the resource utilization adjustment information receiving unit 205. Furthermore, "sensing" can also be understood as receiving the first-stage SCI sent by other terminals 200 within a certain time interval.

[0116] The demodulation unit 203 performs demodulation processing on the received data signal input from the signal separation unit 202, and outputs the demodulated signal to the error correction decoding unit 204.

[0117] The error correction decoding unit 204 decodes the demodulated signal input from the demodulation unit 203 and performs error determination on the decoded signal, such as cyclic redundancy check (CRC). The signal determined to be error-free is output as the received data signal. In addition, the error correction decoding unit 204 outputs setting information related to resource utilization adjustment received at higher layers from the received data signal to the resource utilization adjustment information receiving unit 205.

[0118] The resource utilization adjustment information receiving unit 205 receives, for example, setting information related to resource utilization adjustment input from the error correction decoding unit 204 as a signal from a higher layer. Additionally, the resource utilization adjustment information receiving unit 205 receives, for example, information obtained through sensing from the signal separation unit 202 regarding resources used by other terminals 200, or resource utilization adjustment information sent by other terminals 200. The information received by the resource utilization adjustment information receiving unit 205 is output to the resource utilization adjustment information generating unit 206, for example. Furthermore, for example, when the resources used by this terminal are determined based on the setting information related to resource utilization adjustment, the terminal 200 notifies the signal allocation unit 209 of the resources to be used.

[0119] The resource utilization adjustment information generation unit 206 determines, for example, whether to generate resource utilization adjustment information to be sent to other terminals 200 based on preset setting information or resource utilization adjustment information input from the resource utilization adjustment information receiving unit 205. If resource utilization adjustment information to be sent to other terminals 200 is generated, the resource utilization adjustment information generation unit 206 determines, for example, which channel to use to send the resource utilization adjustment information and outputs the generated resource utilization adjustment information to the signal allocation unit 209.

[0120] The error correction coding unit 207 takes, for example, the transmission data signal (SL data signal) of the side link as input, performs error correction coding on the transmission data signal, and outputs the coded signal to the modulation unit 208.

[0121] The modulation unit 208 modulates the signal input from the error correction coding unit 207, and outputs the modulated signal to the signal distribution unit 209.

[0122] The signal allocation unit 209, for example, allocates the PSCCH for transmitting the first-stage SCI, the PSSCH for transmitting the SL data signal, and the second-stage SCI configured in the PSSCH to resources based on allocation information input from the resource utilization adjustment information receiving unit 205. When there is input from the resource utilization adjustment information generating unit 206, the signal allocation unit 209 allocates resource utilization adjustment information to the relevant channels of the SL resource, for example. The signals allocated to the resources are output to the transmitting unit 210.

[0123] Furthermore, in the signal distribution unit 209, for example, ACK / NACK information can also be distributed to the feedback channel of SL (e.g., PSFCH).

[0124] The transmitting unit 210 performs wireless transmission processing such as amplification and up-conversion on the input signal from the signal distribution unit 209, and transmits the wireless signal from the antenna.

[0125] In the case of transmission processing, the signal distribution unit 209 can, for example, be equivalent to Figure 1 The control unit 20A is shown. The control unit 20A may, for example, include at least one of the following: a first-stage SCI generation unit 212-1, a second-stage SCI generation unit 212-2, a resource utilization adjustment information generation unit 206, and a signal allocation unit 209. Additionally, the transmission unit 210 may be equivalent to... Figure 1 The communication unit 20B is shown.

[0126] On the other hand, considering the receiving and processing, the signal separation unit 202 can, for example, be equivalent to Figure 1 The control unit 20A is shown. The control unit 20A may, for example, include at least one of the following: a first-stage SCI receiving unit 211-1, a second-stage SCI receiving unit 211-2, a resource utilization adjustment information receiving unit 205, and a signal separation unit 202. Additionally, the receiving unit 201 may be equivalent to... Figure 1 The communication unit 20B is shown.

[0127] (Example of terminal 200's operation)

[0128] Next, an example of the operation of terminal 200 will be described.

[0129] Figure 5 This is a flowchart illustrating an example of the transmission processing actions focusing on terminal 200. Figure 6 This is a flowchart illustrating an example of the receiving and processing actions of terminal 200. Figure 5 and Figure 6 The action example shown can be considered as an action example of one terminal 200, or it can be considered as an action example of different terminals 200. For example, it could be, Figure 5 The action example shown is equivalent to the action example of the sending terminal 200. Figure 6 The action example shown is equivalent to the action example of the receiving terminal 200.

[0130] like Figure 5 As illustrated, terminal 200 generates resource utilization adjustment information (S101). Then, terminal 200 sends the generated resource utilization adjustment information to other terminals 200 (S102).

[0131] in addition, Figure 6 As illustrated, terminal 200 receives resource utilization adjustment information sent by other terminals 200 (S201). Then, based on the resource utilization adjustment information received from other terminals, terminal 200 determines the resources to be used for transmission on the side link (S202) and transmits within the determined resources (S203).

[0132] Through this action, for example, the receiving terminal 200 can avoid resources already reserved by other terminals 200 that include the sending terminal (e.g., resources that may be used for transmission by other terminals 200) and select and determine the resources for transmission in the side link.

[0133] Therefore, the probability of conflicts (or contention) in the transmission resources used by the terminals 200 in the sidelink can be reduced. This, in turn, contributes to improvements in sidelink communication performance, such as reliability, low latency, and reduced power consumption.

[0134] [Other structural examples of terminal 200]

[0135] Figure 7 This is a block diagram illustrating other structural examples of the terminal 200 in the implementation method. Figure 7 The illustrated structure can be understood as equivalent to the following structure, which will... Figure 4 In the illustrated structure, the demodulation unit, error correction decoding unit, error correction coding unit, and modulation unit for the Uu link and SL are each set as separate blocks. Furthermore, this is explicitly described as a non-limiting example of the correlation between resource utilization adjustment information and SCI. Additionally, "Uu link" refers to the link between base station 100 and terminal 200. Furthermore, in... Figure 7 In, there is an appendix with Figure 4 Blocks with the same label used can be understood as corresponding to Figure 4 The block already described in the text.

[0136] exist Figure 7 In this terminal 200, for example, a receiving unit 201, a signal separation unit 202, a first-stage SCI receiving unit 211-1, a second-stage SCI receiving unit 211-2, a Uu demodulation unit 203-1, an SL demodulation unit 203-2, a Uu error correction decoding unit 204-1, and an SL error correction decoding unit 204-2. Additionally, the terminal 200, for example, includes a resource utilization adjustment information receiving unit 205, a resource utilization adjustment information generating unit 206, a first-stage SCI generating unit 212-1, and a second-stage SCI generating unit 212-2. Furthermore, the terminal 200, for example, includes a Uu error correction coding unit 207-1, an SL error correction coding unit 207-2, a Uu modulation unit 208-1, an SL modulation unit 208-2, a signal distribution unit 209, and a transmitting unit 210.

[0137] The receiving unit 201 receives the signal using an antenna, and after performing wireless receiving processing such as low-noise amplification and down-conversion on the received signal, outputs the signal to the signal separation unit 202.

[0138] The signal separation unit 202, for example, separates the Uu link signal and the SL signal from the signal received by the receiving unit 201 based on setting information related to resource utilization adjustment. The Uu link signal is output to the Uu demodulation unit 203-1. Additionally, the signal separation unit 202, for example, separates the PSCCH signal from the SL signal and outputs it to the first-stage SCI receiving unit 211-1. Based on resource allocation information input from the first-stage SCI receiving unit 211-1, it separates the second-stage SCI within the PSSCH of the SL signal and outputs it to the second-stage SCI receiving unit 211-2. Furthermore, the signal separation unit 202, for example, separates the data portion of the PSSCH in the SL signal destined for the terminal 200 and outputs it to the SL demodulation unit 203-2.

[0139] The first-stage SCI receiving unit 211-1, for example, attempts to demodulate and decode the PSCCH signal input from the signal separation unit 202. If decoding is successful (in other words, if the SCI is detected), it outputs to the signal separation unit 202 information on the allocation of frequency and time resources of the PSCCH contained in the SCI, and information on the second-stage SCI format. Additionally, the first-stage SCI receiving unit 211-1 outputs, for example, information on resources predetermined for transmission by the terminal 200 in the sidelink to the resource utilization adjustment information generation unit 206.

[0140] The second-stage SCI receiving unit 211-2, for example, confirms (or determines) whether the signal received by the receiving unit 201 is a signal destined for the terminal 200 based on the source ID and destination ID contained in the second-stage SCI. If the signal received by the receiving unit 201 is a signal destined for the terminal 200, the second-stage SCI receiving unit 211-2, for example, outputs demodulation and decoding information for PSSCH to the SL demodulation unit 203-2.

[0141] For example, the Uu demodulation unit 203-1 performs demodulation processing on the signal input from the signal separation unit 202 and outputs the demodulated signal to the Uu error correction decoding unit 204-1.

[0142] 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. Among the decoded signals, for example, higher-level signaling is output to the resource utilization adjustment information receiving unit 205.

[0143] The SL demodulation unit 203-2, for example, performs demodulation processing on the signal input from the signal separation unit 202 based on the information of the second-stage SCI from the second-stage SCI receiving unit 211-2, and outputs the demodulated signal to the SL error correction decoding unit 204-2.

[0144] The SL error correction decoding unit 204-2 decodes the demodulated signal input from the SL demodulation unit 203-2, and performs error detection, such as CRC, on the decoded signal. The signal determined to be error-free is output as the received data signal.

[0145] The resource utilization adjustment information receiving unit 205 receives, for example, setting information related to resource utilization adjustment input from the Uu error correction decoding unit 204-1, which is a signal from a higher layer or a PSSCH signal. Additionally, the resource utilization adjustment information receiving unit 205 receives, for example, information obtained through sensing from the first-stage SCI receiving unit 211-1 regarding resources used by other terminals 200, or resource utilization adjustment information sent by other terminals 200. The information received by the resource utilization adjustment information receiving unit 205 is output to the resource utilization adjustment information generating unit 206. Furthermore, when the resources used by this terminal are determined based on the setting information related to resource utilization adjustment, the resource utilization adjustment information receiving unit 205 notifies the signal allocation unit 209 of the used resources.

[0146] The resource utilization adjustment information generation unit 206 determines, for example, whether to generate resource utilization adjustment information to be sent to other terminals 200 based on preset setting information or resource utilization adjustment information input from the resource utilization adjustment information receiving unit 205. If resource utilization adjustment information to be sent to other terminals 200 is generated, the resource utilization adjustment information generation unit 206 determines, for example, which channel to use to send the resource utilization adjustment information and outputs the generated resource utilization adjustment information to the signal allocation unit 209.

[0147] For example, when sending resource utilization adjustment information using PSSCH, the resource utilization adjustment information generation unit 206 instructs the second-stage SCI generation unit 212-2 to generate a second-stage SCI, which is used to notify "sending resource utilization adjustment information using PSSCH". Additionally, the resource utilization adjustment information generation unit 206 may, for example, instruct the first-stage SCI generation unit 212-1 to send a signal notifying "the format of the second-stage SCI has changed". Furthermore, the resource utilization adjustment information generation unit 206 may, for example, output the resource utilization adjustment information sent using PSSCH to the signal distribution unit 209.

[0148] The first-stage SCI generation unit 212-1, for example, determines the frequency resources for transmitting the PSSCH, generates an SCI containing the determined information, inputs the generated SCI as a control signal to the signal distribution unit 209, and outputs the generated SCI as a signal transmitted using the PSSCH to the signal distribution unit 209. Additionally, the first-stage SCI generation unit 212-1, for example, generates information instructing a change in the format of the second-stage SCI based on an instruction from the resource utilization adjustment information generation unit 206, and configures the generated information into the first-stage SCI.

[0149] The second-stage SCI generation unit 212-2 generates an SCI (second-stage SCI) and outputs it to the signal distribution unit 209. The SCI may include, for example, information for identifying the transmitting terminal 200 (e.g., transmitting source ID), information for identifying the transmitting destination terminal 200 (e.g., transmitting destination ID), and information related to demodulation and decoding. Furthermore, when there is an instruction from the resource utilization adjustment information generation unit 206, and the resource utilization adjustment information is notified to other terminals 200 using PSSCH, the second-stage SCI generation unit 212-2 may, for example, include information for notifying "transmission of resource utilization adjustment information" in the second-stage SCI.

[0150] For example, the Uu error correction coding unit 207-1 takes the Uu link's transmitted data signal (UL data signal) as input, performs error correction coding on the transmitted data signal, and outputs the coded signal to the Uu modulation unit 208-1.

[0151] For example, the Uu modulation unit 208-1 modulates the signal input from the Uu error correction coding unit 207-1 and outputs the modulated signal to the signal distribution unit 209.

[0152] For example, the SL error correction coding unit 207-2 takes the SL transmission data signal (SL data signal) as input, performs error correction coding on the transmission data signal, and outputs the coded signal to the SL modulation unit 208-2.

[0153] The SL modulation unit 208-2 modulates the signal input from the SL error correction coding unit 207-2, and outputs the modulated signal to the signal distribution unit 209.

[0154] The signal allocation unit 209, for example, allocates the PSCCH for transmitting the first-stage SCI, the PSSCH for transmitting the SL data signal, and the second-stage SCI configured on the PSSCH to resources based on allocation information of the SL signal input from the first-stage SCI generation unit 212-1. When there is input from the resource utilization adjustment information receiving unit 205, the signal allocation unit 209, for example, allocates the SL data signal to the PSSCH according to the instruction from the resource utilization adjustment information receiving unit 205. Furthermore, when there is input from the resource utilization adjustment information generation unit 206, the signal allocation unit 209, for example, allocates resource utilization adjustment information to the PSSCH. Additionally, the signal allocation unit 209, for example, allocates the UL data signal to the resources used for PUSCH between the base station 100 and the terminal 200. The signals allocated to resources in the above manner are output to the transmission unit 210.

[0155] In the signal distribution unit 209, for example, ACK / NACK information can also be distributed to the feedback channel of SL (e.g., PSFCH).

[0156] The transmitting unit 210 performs wireless transmission processing such as amplification and up-conversion on the input signal from the signal distribution unit 209, and transmits the wireless signal from the antenna.

[0157] In addition, Figure 7 In the illustrated structure, although the demodulation section, error correction decoding section, error correction coding section and modulation section of the Uu link and SL are set as separate blocks, some or all of them can also be general blocks.

[0158] Furthermore, this is not limited to the case where resource utilization adjustment information is received by terminal 200 as higher-level signaling. For example, resource utilization adjustment information can be preset in the SIM card or preset to terminal 200 using an application layer known as a "preset". Terminal 200 can also use preset information for resource utilization adjustment without receiving setting information related to resource utilization adjustment.

[0159] [Example]

[0160] In this embodiment, terminal 200, for example, sends resource utilization adjustment information to other terminals 200. Upon receiving the resource utilization adjustment information, the other terminals 200 determine, for example, which resources might be used by other terminals 200, or which resources to use for transmission. By using the resource utilization adjustment information, the conflict rate with resources used for transmission by other terminals 200 can be reduced.

[0161] When multiple resource utilization adjustment messages are available, terminal 200 can decide (or set) which resource utilization adjustment message to send, and which channel to use to send it. Thus, resource utilization adjustment messages can be selected and set for terminal 200 based on its characteristics or capabilities.

[0162] Resource utilization adjustment information can set one or more of the various types of information described below. For example, resources can be determined in units of frequency and time resources. As a non-limiting example, the frequency domain can be divided into multiple sub-channels, the time domain into multiple time slots, and resources can be determined based on the time slot number and sub-channel number.

[0163] Hereinafter, the terminal 200 that sends the resource utilization adjustment information will be referred to as "UE-A", and the terminal 200 that receives the resource utilization adjustment information will be referred to as "UE-B". An example of coordination between the terminals 200 will be described. Furthermore, if the resource utilization adjustment information is sent in a manner that, for example, unicast, can only be received by a specific terminal 200, only that specific UE can receive the resource utilization adjustment information.

[0164] On the other hand, if the resource utilization adjustment information is sent in a manner that allows multiple UEs to receive it, such as broadcasting or multicasting, then multiple UEs can receive the resource utilization adjustment information. Therefore, the terminal 200, which is equivalent to UE-B, is not limited to one unit.

[0165] Suppose that UE-A, which sent the resource utilization adjustment information, does not send it on the resource that notifies other UEs that the resource is available. Therefore, in cases where the information is sent by other UEs, resource conflicts between UE-A and other UEs can be avoided or suppressed.

[0166] [Resource Utilization Adjustment Information 1]

[0167] Within a certain time interval, UE-A receives the first-phase SCI transmitted by other UEs. This is also known as "sensing". By receiving the first-phase SCI, UE-A can obtain information about the resources that have been reserved for transmission by other UEs.

[0168] UE-A can simultaneously transmit information about resources that have been reserved for transmission by other UEs. In this case, UE-A can also simultaneously transmit information about resources reserved for transmission by UE-A. Furthermore, if, based on notifications from layers such as RRC or MAC (Media Access Control) obtained from information different from the first-stage SCI, or from application layer notifications or settings, UE-A learns that resources are unavailable, it can transmit information about available and unavailable resources as resource utilization adjustment information, in addition to transmitting information about these resources.

[0169] Therefore, UE-B, which receives resource utilization adjustment information from UE-A, can obtain resource utilization-related information that it could not obtain due to not receiving the first-stage SCI. For example, in the same frequency band, a UE that cannot transmit and receive simultaneously will not receive the first-stage SCI from other UEs during transmission. This is known as the "half-duplex issue." The UE can obtain (or supplement) the information that was not received due to the half-duplex issue from the resource utilization adjustment information from other UEs. In addition, there is an advantage that even a UE that shortens the sensing time of the first-stage SCI to reduce power consumption can obtain information from other UEs that could not be obtained during the shortened sensing time.

[0170] In addition, UE-A can, for example, notify UE-B of information related to windows or time slots that UE-A "can" sense, or windows or time slots that UE-A "cannot" sense. UE-B can then identify and understand the information about resources obtained by UE-A through sensing, or the information that UE-A was unable to obtain.

[0171] As mentioned above, the UE can take resource utilization adjustment information into account when selecting resources for SL.

[0172] Figure 8 An example of non-restrictiveness. For example... Figure 8 As illustrated, UE-A senses the Phase 1 SCIs of other UEs in time slots #0 to #7, and transmits inter-UE coordinate information in time slot #8. In this case, UE-A can transmit information about resources intended for transmission obtained from multiple Phase 1 SCIs received before time slot #8 as resource utilization adjustment information.

[0173] For example, consider the following scenario: based on information sensed in time slot #0, it is known that other UEs may transmit in sub-channel #2 of time slot #10; and based on information sensed in time slot #1, it is known that other UEs may transmit in the two sub-channels #0 and #1 of time slot #12.

[0174] In this scenario, resource utilization adjustment information is used to notify sub-channel #2 of time slot #10 and sub-channels #0 and #2 of time slot #12 that they may be used by other UEs. This notification can, for example, use a bitmap where "1" represents a resource that may be used, and "0" represents a resource with a low probability of use or that is impossible to use. Alternatively, the notification can be made on a time slot basis, notifying UEs of resources that may be used by other UEs.

[0175] Additionally, multiple UEs can send resource utilization adjustment information to compensate for information missed due to half-duplex communication issues. For example, ... Figure 9 As shown, UE-A and UE-B each send resource utilization adjustment information, thereby enabling UE-A and UE-B to supplement each other with resource utilization-related information that UE-A and UE-B could not obtain.

[0176] [Resource Utilization Adjustment Information 2]

[0177] For example, UE-A can send information about resources that UE-A may use as resource utilization adjustment information. This information can also be the same as the information sent in the first-phase SCI of the rel.16NR sidelink. In the first-phase SCI of the rel.16NR sidelink, information about transmission reservations, i.e., resources, up to the next 32 time slots can be sent. However, if a scheduled transmission is cancelled, UE-A may also choose not to use the resources that have been notified to be reserved for transmission.

[0178] Resource utilization adjustment information 2 can also notify of potentially usable resources over a longer period than the resource information sent in the first phase SCI of rel.16NR. Furthermore, in the first phase SCI of the rel.16NR sidelink, while transmission schedules for resources within the same resource pool are notified, transmission schedules related to resources in different resource pools can also be notified. Different resource pools can exist in the same frequency band (BWP, bandwidth portion) or can be different BWPs. Additionally, they can be carriers with the same cell ID or different carriers.

[0179] [Resource Utilization Adjustment Information 3]

[0180] UE-A may also transmit information about resources available for transmission by UE-B as resource utilization 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 obtained through sensing that resources are reserved for transmission by other UEs, and information obtained through line quality measurements. Furthermore, in this case, "candidate resources" are also referred to as "recommended resources." UE-A may transmit (or notify) UE-B of the selected candidate resource information as resource utilization adjustment information.

[0181] In addition, as a non-limiting example of information obtained through line quality measurements, the following information can be listed.

[0182] -CQI (Channel Quality Indicator)

[0183] -RSRP (Reference Signal Received Power)

[0184] -RSRQ (Reference Signal Received Quality)

[0185] -SINR (Signal to Interference plus Noise Ratio)

[0186] The resource utilization adjustment information sent from UE-A can show one or more candidate resources. When there are two or more candidate resources, UE-B can select, for example, the resource to be sent from the two or more candidate resources.

[0187] However, UE-B may decide on the resources to use for transmission based on its own judgment rather than on the instructions from UE-A (in other words, not using or ignoring the received resource utilization adjustment information), or it may decide not to transmit.

[0188] Figure 10 An example of non-restrictiveness. For example... Figure 10 As illustrated, UE-A, based on information obtained through sensing in time slots #0 to #7, determines the resources that other UEs may use (in... Figure 10 In the text, it is marked as "reserved".

[0189] UE-A, for example, determines candidate resources that can be used for UE-B's transmission from resources that are unlikely to be used by other UEs (e.g., resources that are not "reserved"). Figure 10 In the process, it is marked as "recommended" and, based on the resource utilization adjustment information of time slot #8, sub-channel #1 of time slot #11 and sub-channel #2 of time slot #12 are notified to UE-B as candidate resources.

[0190] UE-B can select one of the two candidate resources shown in the resource utilization adjustment information (sub-channel #1 of time slot #11 and sub-channel #2 of time slot #12) and use the selected resource for transmission. However, UE-B may use other resources different from those shown in the resource utilization adjustment information for transmission, or it may choose not to transmit.

[0191] Figure 10 The example shown is that UE-B selects subchannel #1 of time slot #11 from among the multiple candidate resources indicated by the resource utilization adjustment information received from UE-A for transmission. In this case, the format used by UE-B for transmission can be the same as the format in rel.16.

[0192] Alternatively, contrary to the above example, UE-A can use resource utilization adjustment information to notify UE-B of resources that are unsuitable for transmissions by UE-B (for convenience, these can also be referred to as "unrecommended resources"). In this case, UE-B can bypass the resources indicated by the received resource utilization adjustment information and select and determine the resources to be used for transmission. For example, the unrecommended resources can be selected and determined based on at least one of information about resources already reserved for transmissions by other UEs and information obtained through line quality measurements.

[0193] [Resource Utilization Adjustment Information 4]

[0194] UE-A can also send information about resources intended for transmission by UE-B as resource utilization adjustment information. This resource utilization adjustment information can also be understood as resource allocation information (or scheduling information) for other UEs. UE-B transmits according to the resource allocation (in other words, resource scheduling) performed by UE-A.

[0195] The resource utilization adjustment information 4 sent by UE-A can be for one UE or for multiple UEs. UE-A that sends resource utilization adjustment information for multiple UEs can also be called a "header UE". UE-A, like base station 100 (e.g., gNB), performs scheduling of UEs within the group or in the vicinity.

[0196] The following settings can be adopted: the scheduling information is received only by the UE-B that receives the resource utilization adjustment information 4 and sends it based on that information; or the following settings can be adopted: the scheduling information is also sent by the UE-B and received by the destination UE.

[0197] When the destination UE of UE-B also receives resource utilization adjustment information, UE-B can prepare to receive transmissions from the destination UE in the designated resource and enter a receiving state, thus avoiding half-duplex communication problems. Furthermore, UE-B enters a receiving state in the designated resource and stops receiving in other resources, thereby reducing power consumption.

[0198] Figure 11 An example of non-restrictiveness. For example... Figure 11 As illustrated, similar to resource utilization adjustment information 3, UE-A, based on information obtained through sensing in time slots #0 to #7, determines other resources that the UE may use (in... Figure 11 (In the middle, marked as "reserved").

[0199] Next, UE-A determines the transmission resources to allocate to UE-B from, for example, resources that are unlikely to be used by other UEs (e.g., resources not designated as "reserved"). Figure 11 In the middle, it is marked as "scheduled"), and according to the resource utilization adjustment information 4 of time slot #8, the sub-channel #1 of time slot #11 is notified to UE-B as resource allocation information.

[0200] UE-B uses resources notified (in other words, scheduled) by UE-A. Figure 11 Transmission takes place in sub-channel #1 of time slot #11. In this case, the format used by UE-B for transmission can be the same as that of rel.16.

[0201] [General Implementation Items]

[0202] When UE-A is equivalent to a receiving UE (Rx UE) for UE-B, the information on resources available to UE-B, contained in the resource utilization adjustment information sent by UE-A, can be selected from the time slot when UE-A enters the receiving state. This avoids the situation where UE-A fails to receive signals sent by UE-B because UE-A is in the transmitting state.

[0203] Furthermore, the information on resources that UE-B can transmit, sent from UE-A to UE-B, can be limited to information on resources that UE-B can transmit to UE-A, or it can include information on resources that UE-B can transmit to other UEs different from UE-A. Regarding resources that UE-B can transmit to other UEs different from UE-A, UE-A can also specify the destination UE for the transmission by UE-B.

[0204] The timing for the UE to send resource utilization adjustment information can be set periodically or aperiodically. In the periodic case, it can be set in units such as 10, 11, ..., 160, 200, 300 (mseconds or slots). In the aperiodic case, it can be set such that the resource utilization adjustment information is sent along with the data signal when UE-A sends a data signal; or it can be set such that it is sent only when another UE requests the transmission of resource utilization adjustment information.

[0205] Although the resource information sent by resource utilization adjustment information 1, 2, 3, and 4 is set as notification slot number and sub-channel number, the time direction information may not be a slot number, but rather a symbol number, or a different time unit referred to as a "sub-slot" or "sub-frame". Furthermore, although the frequency direction information is set as a sub-channel, it may also be a different frequency unit such as a resource block, sub-band, resource pool, BWP, or carrier.

[0206] Resource utilization adjustment information 2 can also notify potentially usable resources over a longer period than the resource information sent by the first-stage SCI of rel.16NR. Other resource utilization adjustment information 1, 3, and 4 can also notify resources, for example, up to 32 slots later, and can also notify resource utilization adjustment information over a longer period.

[0207] Next, the channels for transmitting resource utilization adjustment information will be explained. As an example of a channel for transmitting resource utilization adjustment information, PSSCH, Phase 2 SCI, a new channel, PSFCH, higher-layer signaling, and Phase 1 SCI can be considered. Multiple channels can also be combined to transmit resource utilization adjustment information.

[0208] [PSSCH]

[0209] UE-A can use PSSCH to send resource utilization adjustment information. As an example of a method to notify that "the PSSCH contains resource utilization adjustment information", the following two actions can be listed.

[0210] (PSSCH Action Example 1)

[0211] In PSSCH action example 1, the first-stage SCI or the second-stage SCI is used to notify that "the PSSCH contains resource utilization adjustment information", and the PSSCH is used to send the resource utilization adjustment information.

[0212] In the second phase, SCI can use SCI Format 2-A or SCI Format 2-B to notify “PSSCH contains resource utilization adjustment information”. Alternatively, it can use a new format with other names such as SCI Format 2-C.

[0213] PSSCH can be sent according to one of the communication types: broadcast, multicast, or unicast. The broadcast type is indicated in SCI format 2-A. SCI format 2-B is the format used for multicast. In the case of broadcast, resource utilization adjustment information is information that can be received by any UE.

[0214] In the case of resource utilization adjustment information 1 or resource utilization adjustment information 2, it is not necessary to know which UE the information is sent to. Therefore, by using broadcasting, multiple UEs can share the status related to resource utilization.

[0215] On the other hand, in the case of resource utilization adjustment information 3 or resource utilization adjustment information 4, in order to clarify which UE the resource allocation information is sent to, for example, the ID used to identify the UE, i.e., the destination ID, can also be included in the PSSCH notification.

[0216] In the multicast scenario, resource utilization adjustment information is sent to the UE group. The UE group can be identified, for example, based on the destination ID notified by the Phase 2 SCI. In the multicast scenario, UEs within a UE group can share resource utilization adjustment information.

[0217] In the case of resource utilization adjustment information 3 or resource utilization adjustment information 4, similarly to broadcasting, in order to clarify which UE the resource allocation information is sent to, for example, the destination ID, which identifies which UE the information is sent to, can also be included in the PSSCH notification.

[0218] In the case of unicast, resource utilization adjustment information is sent to a specific UE. The destination UE can be determined based on the destination ID notified by the Phase 2 SCI. Therefore, even if the PSSCH does not contain the destination ID, the destination UE can still be identified.

[0219] When resource utilization adjustment information is included in the PSSCH, the resource utilization adjustment information can be encoded as a data signal within the PSSCH, or it can be encoded independently of the data signal within the PSSCH.

[0220] Figure 12 This represents an example of sending resource utilization adjustment information in the PSSCH area. For example... Figure 12 As illustrated, the candidate resource for sending (or configuring) resource utilization adjustment information within a time slot can be the entire PSSCH area.

[0221] In cases where resource utilization adjustment information and data signals within the PSSCH are encoded independently, for example, such as Figure 13 As shown, resources for transmitting resource utilization adjustment information can be secured within the PSSCH. In other words, candidate resources for transmitting (or configuring) resource utilization adjustment information within a time slot can also be resources within the PSSCH area. The resources used for transmitting utilization adjustment information can be predetermined, for example, which symbol and subcarrier within the PSSCH will be used.

[0222] If the resource utilization adjustment information and the PSSCH data signal are decoded independently, there is an advantage, for example, that the resource utilization adjustment information can be decoded before the data signal. When the PSSCH data signal and source utilization adjustment information are decoded independently, the amount of data that can be transmitted in the PSSCH will vary depending on the size of the resource utilization adjustment information. Therefore, for example, the amount of data transmitted in the PSSCH, i.e., TBS (Transport Block Size), can be calculated based on resources other than the resource amount in the resource utilization adjustment information.

[0223] When using SCI format 2-A or SCI format 2-B to notify that "the PSSCH contains resource utilization adjustment information," for example, a bit indicating that "the PSSCH contains resource utilization adjustment information" can be added to SCI format 2-A or SCI format 2-B. Alternatively, the bits in SCI format 2-A or SCI format 2-B can be replaced with bits indicating that "the PSSCH contains resource utilization adjustment information."

[0224] When a notification bit is added, the number of bits in SCI format 2-A or SCI format 2-B differs compared to when no notification bit is added. When bits in SCI format 2-A or SCI format 2-B are replaced with notification bits, the information content in SCI format 2-A or SCI format 2-B differs.

[0225] Therefore, notifications such as "different bit count" or "bit replacement" can be made in advance at higher layers (e.g., RRC), or a setting can be made in advance as referred to as "preset". Thus, a UE with notification or setting can change or replace the number of received bits in the second-stage SCI.

[0226] Alternatively, it can be configured to use the first-stage SCI to notify changes or replacements in the number of bits. For example, the reserved bits contained in the first-stage SCI can be used to notify that "the number of bits in SCI format 2-A or SCI format 2-B is different" or to replace bits.

[0227] Alternatively, in SCI format 2-A, the HARQ feedback enable / disable indicator can be set to "enable," and the communication type indicator can be set to "broadcast," thereby notifying that "the PSSCH contains resource utilization adjustment information." This combination does not exist in rel.16; therefore, HARQ feedback cannot be set in the case of broadcast. Although legacy UEs receiving the above signal may determine that there is a reception error in SCI format 2-A due to the non-existent combination, UEs aware of the new setting can determine that they have been notified that "the PSSCH contains resource utilization adjustment information."

[0228] When using the new SCI format to notify that "resource utilization adjustment information is included in the PSSCH", the "use of the new SCI format" is also notified in advance in the higher layer (e.g., RRC, etc.), or it is set in advance as called "preset", or the new SCI format is indicated in the reserved bits contained in the first-stage SCI, so that the UE can receive the new SCI format.

[0229] Alternatively, when using SCI Format 2-A, SCI Format 2-B, or the new SCI to notify that "the PSSCH contains resource utilization adjustment information", the Destination ID or Source ID can also be used for notification.

[0230] For example, the destination ID or source ID used when sending resource utilization adjustment information in PSSCH can be preset. The preset destination ID or source ID is set to a value that is different from the destination ID or source ID used when sending data in other PSSCHs.

[0231] Therefore, a UE that receives SCI format 2-A, SCI format 2-B or the new SCI can identify that the PSSCH contains resource utilization adjustment information based on the destination ID or the sending source ID.

[0232] Alternatively, when using the first-stage SCI to notify that "the PSSCH contains resource utilization adjustment information", reserved bits can also be used for this notification.

[0233] (PSSCH action example 2)

[0234] In PSSCH action example 2, for instance, a notification is sent stating that "the MAC CE (Control Element) has an area where MAC header (also known as "sub-header") resource utilization adjustment information is sent," and resource utilization adjustment information is sent in the MAC CE. The MAC header and MAC CE are sent in the data area of ​​PSSCH.

[0235] [Second Phase SCI]

[0236] Resource utilization adjustment information can also be sent in the second-stage SCI or the new SCI format. When sending resource utilization adjustment information in SCI format 2-A or SCI format 2-B, a notification bit can be added to SCI format 2-A or SCI format 2-B. Alternatively, the bits in SCI format 2-A or SCI format 2-B can be replaced with notification bits.

[0237] When a notification bit is added, the number of bits in SCI format 2-A or SCI format 2-B differs compared to when no notification bit is added. When bits in SCI format 2-A or SCI format 2-B are replaced with notification bits, the information content in SCI format 2-A or SCI format 2-B differs.

[0238] Therefore, for example, notifications such as "different number of bits" or "bit substitution" can be made in advance at a higher level (e.g., RRC), or settings can be made in advance as referred to as "preset".

[0239] Therefore, a UE with notification or configuration can change or replace the number of received bits in the second-stage SCI. Alternatively, it can be configured to use the first-stage SCI to notify of changes or replacements in the number of bits in the second-stage SCI. Furthermore, it can also notify of "different number of bits in SCI format 2-A or SCI format 2-B" or bit replacements within the reserved bits included in the first-stage SCI.

[0240] For example, when using SCI format 2-B, the HARQ feedback enable / disable indicator can also be set to "disabled" and used...

[0241] -Region ID-12 bits

[0242] -Communication range requirement- 4 bits,

[0243] Send resource utilization adjustment information.

[0244] In broadcasts using SCI format 2-B, where HARQ feedback is not required (e.g., in the "disabled" case), the area ID and communication range information are not used because they are for HARQ feedback. Therefore, these bits can be used for resource utilization adjustment information.

[0245] When using the new SCI format to notify resource utilization adjustment information, the "use new SCI format" is also notified in advance at higher layers (e.g., RRC), or pre-set as referred to as "preset," or the reception of the new SCI format is indicated in the reserved bits contained in the first-stage SCI, thereby enabling the UE to receive the new SCI format. Because it contains resource utilization adjustment information, the new format can also be a format with a larger number of bits or a larger payload size than SCI format 2-A or SCI format 2-B.

[0246] When using SCI format 2-A, SCI format 2-B, or the new SCI to notify of resource utilization adjustment information, the destination ID or source ID can also be used to notify of the existence of resource utilization adjustment information. For example, the destination ID or source ID used when sending resource utilization adjustment information can be preset. The preset destination ID or source ID is set to a value different from the destination ID or source ID used when sending data with other PSSCHs.

[0247] Therefore, a UE receiving SCI format 2-A, SCI format 2-B, or the new SCI can identify the resource utilization adjustment information contained in the second-stage SCI based on the destination ID or the source ID. For example, it can pre-determine which bit in SCI format 2-A, SCI format 2-B, or the new SCI will be replaced with the resource utilization adjustment information.

[0248] Alternatively, in SCI format 2-A, the HARQ feedback enable / disable indicator can be set to "Enabled," and the communication type indicator can be set to "Broadcast," thereby notifying the existence of resource utilization adjustment information. This combination does not exist in rel.16; therefore, HARQ feedback cannot be set in the case of broadcast. Although older UEs receiving the above signal may determine that there is a reception error in SCI format 2-A due to the non-existent combination, UEs aware of the new settings can determine that they have been notified of resource utilization adjustment information. In this case, a portion of the information in SCI format 2-A can be replaced with resource utilization adjustment information.

[0249] [New Channel]

[0250] Resource utilization adjustment information can also be sent via a new channel. When using a new channel to notify resource utilization adjustment information, the "use of new channel" is also notified in advance in a higher layer (e.g., RRC), or is preset as referred to as "preset", or is indicated in the reserved bits contained in the first-stage SCI or in the second-stage SCI as "resource utilization adjustment information exists in the new channel", thereby enabling the UE to receive the new channel.

[0251] New channels can also be configured with different PRBs, sub-channels, resource pools, BWPs, and carriers than existing channels. For example, in Rel.16, when the number of PRBs in the resource pool is not a multiple of the number of PRBs in the sub-channel, the excess PRBs will not be used for resource allocation. Therefore, for example, it can be as follows: Figure 14 As shown, the new channel is configured in the redundant PRB(s) and resource utilization adjustment information is transmitted in the new channel. This results in improved resource utilization efficiency. Furthermore, the new channel can be configured in all time slots, in only a portion of the time slots, or across multiple time slots.

[0252] [PSFCH]

[0253] Resource utilization adjustment information can also be sent via PSFCH. In Rel.16 PSFCH, 1 bit of ACK / NACK is sent using 1 symbol, with the same format as PUCCH (Physical Uplink Control Channel) format 0. Here, the format indicates the number of symbols, sequence, DMRS configuration, etc.

[0254] The PSFCH for configuring resource utilization adjustment information can also be set to a different format than the PSFCH in Rel.16. This different format could be equivalent to PUCCH formats 1, 2, 3, or 4. For example, PUCCH formats 2, 3, and 4 allow for configuration of more than 2 bits, making them suitable for situations where the amount of resource utilization adjustment information exceeds 2 bits. Alternatively, a different format from the PUCCH format can also be used to construct the PSFCH.

[0255] When using PSFCH to send resource utilization adjustment information, the following configuration can also be adopted: resource utilization adjustment information is sent only when there is a request from another UE. For example, if UE-B requests UE-A to send resource utilization adjustment information, UE-A will send the resource utilization adjustment information using PSFCH.

[0256] Therefore, the resources used by the PSFCH transmitted by UE-A can be determined when UE-B transmits it. UE-A can also, unlike when transmitting PSSCH, use information such as the first-stage SCI or second-stage SCI to notify about the configuration or modulation of PSFCH resources. Thus, for example, it is possible to transmit PSFCH without transmitting the first-stage SCI or second-stage SCI, thereby reducing the overhead of resource utilization.

[0257] [RRC]

[0258] For example, resource utilization adjustment information can be sent using the RRC of the Uu link or the PC5 RRC between UEs. Alternatively, a portion of the resource utilization adjustment information can be sent using RRC or PC5 RRC, and other resource utilization adjustment information can be sent using one of the methods shown in the above action examples. For example, information with a long allocation period can be sent using RRC or PC5 RRC, and information with a short allocation period can be sent using one of the methods shown in the above action examples.

[0259] [Phase 1 SCI]

[0260] Resource utilization adjustment information can also be sent via Phase 1 SCI. For example, for resource utilization adjustment information 3 or resource utilization adjustment information 4, UE-A can use Phase 1 SCI while sending resource utilization adjustment information for UE-B.

[0261] (Example 1 of SCI actions in Phase 1)

[0262] Resource utilization adjustment information can be sent, for example, in the same time slot as the first-phase SCI. Figure 15 This represents one example.

[0263] UE-A, for example, uses the first-stage SCI to transmit resource allocation information for UE-B, which is also transmitted within the same time slot. Reserved bits within the first-stage SCI can also be used to indicate which UE is being allocated the resource. UE-A does not transmit outside the first-stage SCI portion of the same time slot.

[0264] UE-B receives the first-stage SCI and, if the resources destined for UE-B are in the same time slot as the time slot in which the first-stage SCI was received, transmits the second-stage SCI and PSSCH. However, in the case of resource utilization adjustment information 3, UE-B may also choose not to transmit based on its own judgment.

[0265] Therefore, it is possible to allocate and transmit PSSCH from different terminals within the same time slot, thus reducing the latency from allocation to data transmission. Furthermore, the Rel.16 frame format allows for frequency reuse of the first-stage SCI and PSSCH areas. Therefore, it is preferable to avoid directly using the Rel.16 format. Thus, instead of frequency reuse for the first-stage SCI transmitted by UE-A and the second-stage SCI PSSCH transmitted by UE-B, time reuse is employed, for example, UE-B begins transmission after X symbols from the first-stage SCI.

[0266] Alternatively, UE-A can send the first-stage SCI and the second-stage SCI, while UE-B can send the data portion of the PSSCH.

[0267] (Example 2 of SCI actions in Phase 1)

[0268] In this example, the first-stage SCI is used to send resource allocation information for this terminal and resource utilization adjustment information to other UEs. Reserved bits within the first-stage SCI can also be used to indicate which UE is being allocated to.

[0269] In the first phase of SCI time resource allocation, either 2 or 3 time slots can be allocated. The first time slot is for sending the first phase of SCI.

[0270] In this action example, the allocation of the time slot that is the same as the first phase SCI of the first time slot is set to the allocation for the same UE as the UE that sent the first phase SCI, i.e., the resources of UE-A, and the allocation of the second and third time slots is set to the allocation for other UEs.

[0271] Therefore, it has the following advantages: compared with Re.16, the configuration (or format) of the first-stage SCI, the second-stage SCI and PSSCH of the first time slot can be changed without changing them.

[0272] In the second and third time slots, UEs that have been allocated resources in the first time slot are able to send the first-stage SCI and the second-stage SCI.

[0273] Therefore, it is possible to send without changing the format from Rel.16. Figure 16 This is one example. In Figure 16 In this process, UE-A notifies UE-B to transmit in time slot #3. UE-A performs its transmission in time slot #0, and UE-B performs its transmission in time slot #3.

[0274] In this example, the format does not need to be changed from Rel.16, so even UEs that do not support the function of receiving resource utilization adjustment information can receive resources.

[0275] (Example 3 of SCI actions in Phase 1)

[0276] In this example, the first-stage SCI is used to notify other UEs whether transmission is permitted in resources pre-determined periodically in higher layers. For example, reserved bits within the first-stage SCI can also be used for this notification. Therefore, resource allocation information can be omitted from the first-stage SCI, thus reducing the number of bits required.

[0277] Next, an example of a method for a UE to decide to send resource utilization adjustment information will be described.

[0278] (Method 1: Pre-setting)

[0279] The UE that sends resource utilization adjustment information can be determined by the base station 100 (e.g., eNB or gNB) and configured in a higher layer such as the SIB (System Information Block) or RRC, or MAC, referred to as "configured". Alternatively, the UE that sends resource utilization adjustment information can be preset by the specification, referred to as "preset", or preset in the SIM, or set in the application layer. For example, in cases where sidelink communication is used for mission-critical communication, pre-setting which UE sends resource utilization adjustment information can suppress unproductive resource utilization, thus improving efficiency.

[0280] (Method 2: S-SSB)

[0281] A UE that sends resource utilization adjustment information can be, for example, a UE that sends an S-SSB. A UE that sends an S-SSB can be, for example, a UE that has established a Uu link with base station 100. A UE that sends an S-SSB can send both S-SSB and resource utilization adjustment information.

[0282] The S-SSB is a signal that includes the S-PSS, S-SSS, and PSBSH. This signal is transmitted, for example, at a period of 160ms and is used to obtain synchronization or transmit information in the PSBCH. When transmitting the S-SSB, resource utilization adjustment information can be sent in the PRB adjacent to the S-SSB, or in the symbol or time slot adjacent to the S-SSB. Thus, other UEs can receive the resource utilization adjustment information at a predetermined time, such as a 160ms period.

[0283] (Method 3: Determined by UE)

[0284] Alternatively, the UE can decide whether to send resource utilization adjustment information. For example, the UE can generate a random value and compare it with a predetermined value. If the random value falls within a certain range, it decides to send resource utilization information. For instance, the random value can be generated based on information such as the UE ID, member ID, scrambling sequence, and time slot number. This prevents multiple UEs from sending resource utilization information out of order.

[0285] (Method 4: Determine based on PSSCH conditions)

[0286] Alternatively, the UE can send resource utilization adjustment information when the transmitted TBS is greater than a certain value (e.g., a threshold). The larger the TBS, the smaller the proportion of overhead for resource utilization adjustment information becomes, thus having a smaller impact on resource utilization.

[0287] Alternatively, if the MCS (Multi-Cost System) is higher than a certain value (e.g., a threshold), the UE can send resource utilization adjustment information. A higher MCS indicates better communication quality between UEs, thus suggesting that the UEs are likely close to each other. In this case, surrounding UEs can be considered to be in the same communication environment, and therefore, the sharing of sensed information is effective.

[0288] (Method 5: Determine based on whether there has been prior communication)

[0289] The UE that sends resource utilization adjustment information can also be a UE that has previously (or in the past) communicated with other UEs via a sidelink. For example, if there is already communication between UE-A and UE-B, UE-A can send resource utilization adjustment information. For example, UE-A that sends resource utilization adjustment information can be a UE that was previously a destination UE or a source UE for UE-B.

[0290] (Method 6: UE required by pedestrian UE)

[0291] Alternatively, the resource utilization adjustment information can be sent by the UE requested by the pedestrian UE. Since the pedestrian UE is envisioned as a portable terminal such as a smartphone, there is a requirement to minimize power consumption. Therefore, it is effective to share sensing information with other UEs, so the resource utilization adjustment information can be sent by other UEs requested by the pedestrian UE.

[0292] (Method 7: Determine based on distance or SINR)

[0293] Alternatively, resource utilization adjustment information can be sent 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 the threshold, or when the distance is closer than the threshold, the surrounding UEs can be considered to be UEs in the same communication environment; therefore, the sharing of sensed information is effective. For example, the distance between terminals can be determined based on the area ID. Alternatively or additionally, the distance between terminals can also be determined based on information from the application layer.

[0294] (other)

[0295] In the above embodiments, although the channel under the condition of utilizing adjustment information for new transmission resources has been described, the method for configuring new channels for resources can also be used for configuring other new information. Examples of other new information include information allocated to different carriers or BWPs, information on the presence or number of repeated transmissions, the format of PSFCH, information specifying transmission resources, information setting transmission power, information specifying transmission beams, information specifying the number of MIMO (Multiple-Input and Multiple-Output) transmission layers, and information specifying the presence or resources for transmitting synchronization signals.

[0296] The above action examples can also be used in combination. For example, the action examples can vary depending on the UE, or a single UE can send resource utilization adjustment information based on multiple action examples. For example, a UE sending resource utilization adjustment information 2 can also use the first-stage SCI and PSSCH to send resource utilization adjustment information 2. In this case, it is also possible that the first-stage SCI indicates information up to 32 slots to the right, and the PSSCH indicates information for slots further back.

[0297] Alternatively, for example, the resource utilization adjustment information 3 or 4 could be sent by a UE referred to as the "header UE," and resource utilization adjustment information 1 or 2 could be sent by other UEs connected to the header UE. In this way, the header UE can receive resource allocation information from other UEs that it could not receive when sending its own information, thus supplementing the information.

[0298] Terminals communicating in a side link can include terminals that only perform one of sending and receiving, as well as terminals that perform both sending and receiving.

[0299] When setting up sidelink-related settings in advance, the setting method can be preset according to specifications or preset in the SIM. In addition, the setting method may include settings in the application layer called "preset", settings in a higher layer such as SIB or other RRC called "setting", or settings in the MAC.

[0300] Alternatively, PSCCH can be replaced with PDCCH, PSSCH with PDSCH (Physical Downlink Shared Channel) or PUSCH, PSFCH with PUCCH, and PSBCH with PBCH (Physical Broadcast Channel), and the above implementation can be applied to communication between base station 100 and terminal 200. Additionally, the second-stage SCI can be replaced with uplink control information, i.e., UCI (Uplink Control Information), and the above implementation can be applied to the UCI transmitted in PUSCH.

[0301] In addition, the above implementation can also be applied only to mode 2 of mode 1 and mode 2 of the side link.

[0302] Resource utilization adjustment information can also be shared among multiple UEs. This allows them to compensate for sensing information missed due to half-duplex communication issues. UEs configured to receive resource utilization adjustment information can also be configured not to perform sensing. This reduces power consumption associated with sensing.

[0303] The above describes the implementation methods of this disclosure.

[0304] [Other Implementation Methods]

[0305] (Base station)

[0306] In this disclosure, the base station can also be a TRP (Transmission Reception Point), clusterhead, access point, RRH (Remote Radio Head), eNodeB (eNB), gNodeB (gNB), BS (Base Station), BTS (Base Transceiver Station), host, gateway, etc. Additionally, in sidelink communication, a terminal can replace the base station. Furthermore, it can also be a relay device for communication between a high-level relay node and a terminal.

[0307] (Uplink / Downlink / Sidelink)

[0308] This disclosure can be applied to any link in the uplink, downlink, and sidelink. For example, it can also be applied to the uplink PUSCH (Physical Uplink Shared Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel), downlink PDSCH (Physical Downlink Shared Channel), PDCCH (Physical Downlink Control Channel), PBCH, and sidelink PSSCH, PSCCH, and PSBCH. Furthermore, PSCCH and PSSCH are examples of sidelink control channels and sidelink data channels, respectively. Additionally, PBCH and PSBCH are examples of broadcast channels.

[0309] (Data Channel / Control Channel)

[0310] This disclosure can also be applied to any channel in the data channel and the control channel. For example, the channels in this disclosure can be replaced with PDSCH, PUSCH, PSSCH of the data channel, and PDCCH, PUCCH, PBCH, PSCCH, PSBCH of the control channel.

[0311] (Reference signal)

[0312] In this disclosure, the reference signal is a signal known to both the base station and the terminal, and is sometimes also referred to as "RS (Reference Signal)" or "pilot signal". The reference signal can also be DMRS, CSI-RS (Channel State Information-Reference Signal), TRS (Tracking Reference Signal), PTRS (Phase Tracking Reference Signal), CRS (Cell-specific Reference Signal), or SRS (Sounding Reference Signal).

[0313] (Time interval)

[0314] In the above embodiments, the unit of time resource is not limited to one or a combination of time slots and symbols. For example, it can be a frame, superframe, subframe, time slot, time slot subslot, minislot, or symbol, OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier-Frequency Division Multiplexing) symbol, or other time resource units. Furthermore, the number of symbols contained in one time slot is not limited to the number of symbols exemplified in the above embodiments; it can also be other numbers of symbols.

[0315] (frequency band)

[0316] This disclosure can also be applied to either the licensed band or the unlicensed band.

[0317] (communication)

[0318] This disclosure can also be applied to any communication in base station-terminal communication, terminal-to-terminal communication (sidelink communication, Uu link communication), and V2X (Vehicle to Everything) communication. For example, the channels of this disclosure can also be replaced by PSCCH, PSSCH, PSFCH, PSBCH, PDCCH, PUCCH, PDSCH, PUSCH, and PBCH.

[0319] Furthermore, this disclosure can also be applied to terrestrial networks and any non-terrestrial network (NTN) that uses satellites or High Altitude Pseudo Satellites (HAPS). Additionally, this disclosure can also be applied to terrestrial networks with large cell sizes and ultra-wideband transmission networks, where transmission delays exceed the symbol length or time slot length.

[0320] <5G NR System Architecture and Protocol Stack>

[0321] To realize the next version of fifth-generation mobile phone technology (also known simply as "5G"), which includes the development of a new radio access technology (NR) operating in the frequency range up to 100 GHz, 3GPP is continuing its work. The first version of the 5G standard was completed at the end of 2017, thus enabling the transition to the trial production of terminals (e.g., smartphones) according to the 5G NR standard and commercial deployment.

[0322] For example, the overall system architecture envisions a gNB-RAN (Next Generation Radio Access Network). The gNB provides the UE (User Equipment) side termination for the NG radio access protocols (SDAP (Service Data Adaptation Protocol) / PDCP (Packet Data Convergence Protocol) / RLC (Radio Link Control) / MAC (Medium Access Control) / PHY (Physical Layer)) and control plane (RRC). gNBs are interconnected via the Xn interface. Additionally, gNBs are connected to the NGC (Next Generation Core) via the Next Generation (NG) interface, and more specifically, to the AMF (Access and Mobility Management Function) (e.g., a specific core entity implementing the AMF) via the NG-C interface, and to the UPF (User Plane Function) (e.g., a specific core entity implementing the UPF) via the NG-U interface. Figure 17 This refers to the NG-RAN architecture (e.g., refer to 3GPP TS 38.300v15.6.0, section 4).

[0323] The user plane protocol stack for NR (e.g., see 3GPP TS 38.300, section 4.4.1) comprises the PDCP (Packet Data Convergence Protocol, see TS 38.300, section 6.4) sublayer, RLC (Radio Link Control, see TS 38.300, section 6.3) sublayer, and MAC (Media Access Control, see TS 38.300, section 6.2) sublayer, which terminates on the network side in the gNB. Additionally, a new Access Stratum (AS) sublayer (SDAP: Service Data Adaptation Protocol) has been incorporated into PDCP (e.g., see 3GPP TS 38.300, section 6.5). Furthermore, a control plane protocol stack is defined for NR (e.g., see TS 38.300, section 4.4.2). A summary of Layer 2 functionality is described in Section 6 of TS 38.300. The functions of the PDCP sublayer, RLC sublayer, and MAC sublayer are listed in Sections 6.4, 6.3, and 6.2 of TS 38.300, respectively. The functions of the RRC layer are listed in Section 7 of TS 38.300.

[0324] For example, the media access control layer handles the multiplexing of logical channels, scheduling of processing involving various parameter sets, and various functions associated with scheduling.

[0325] For example, the Physical Layer (PHY) is responsible for encoding, PHY HARQ (Physical Layer Hybrid Automatic Repeat Request) processing, modulation, multi-antenna processing, and mapping signals to appropriate physical time-frequency resources. Additionally, the Physical Layer handles the mapping of physical channels to transport 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 to transmit a specific transport channel; each transport channel is mapped to a corresponding physical channel. For example, in physical channels, uplink physical channels include PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel), and PUCCH (Physical Uplink Control Channel), while downlink physical channels include PDSCH (Physical Downlink Shared Channel), PDCCH (Physical Downlink Control Channel), and PBCH (Physical Broadcast Channel).

[0326] In NR use cases / extended scenarios, enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine-type communications (mMTC) may have multiple necessary conditions in terms of data rate, latency, and coverage. For example, eMBB is expected to support peak data rates approximately three times that of IMT-Advanced (20Gbps in downlink and 10Gbps in uplink) and effective (user-experienced) data rates. On the other hand, in the case of URLLC, stricter necessary conditions are proposed for ultra-low latency (0.5ms latency in both UL and DL) and high reliability (within 1ms, 1-10-5). Finally, in mMTC, high connection density (1,000,000 devices / km in urban environments) is preferred. 2 ), wide coverage in harsh environments and extremely long battery life (15 years) for inexpensive devices.

[0327] Therefore, a set of OFDM (Orthogonal Frequency Division Multiplexing) parameters suitable for one use case (e.g., subcarrier spacing (SCS), OFDM symbol length, cyclic prefix (CP) length, number of symbols per scheduling interval) may be ineffective for other use cases. For example, in low-latency services, it is preferable to have shorter symbol lengths (and thus larger subcarrier spacings) and / or fewer symbols per scheduling interval (also known as "TTI"). Moreover, in extended scenarios with large channel delay spreads, it is preferable to have longer CP lengths than in scenarios with shorter delay spreads. The subcarrier spacing can also be optimized depending on the situation to maintain the same CP overhead. NR supports more than one subcarrier spacing value. Correspondingly, subcarrier spacings of 15kHz, 30kHz, 60kHz, etc., are currently considered. The symbol length Tu and subcarrier spacing Δf are directly related according to the formula Δf = 1 / Tu. Similar to the LTE (Long Term Evolution) system, the term "resource element" can be used to represent the smallest resource unit consisting of a subcarrier with a length corresponding to one OFDM / SC-FDMA (Single-Carrier Frequency Division Multiple Access) symbol.

[0328] In the new 5G-NR wireless system, resource grids for subcarriers and OFDM symbols are defined in both the uplink and downlink for each parameter set and each carrier. Each element of the resource grid is called a "resource element," which is determined based on the frequency index in the frequency domain and the symbol position in the time domain (refer to 3GPP TS 38.211v15.6.0).

[0329] <Functional Separation Between NG-RAN and 5GC in 5G NR>

[0330] Figure 18 This indicates the functional separation between NG-RAN and 5GC. The logical node of NG-RAN is either gNB or ng-eNB. 5GC has logical nodes AMF, UPF, and SMF (Session Management Function).

[0331] For example, gNB and ng-eNB host the following main functions:

[0332] - Functions such as Radio Bearer Control, Radio Admission Control, Connection Mobility Control, and Radio Resource Management (RRM) that dynamically allocates (schedules) resources to the UE in both the uplink and downlink links;

[0333] - Data IP (Internet Protocol) header compression, encryption, and integrity protection;

[0334] - Selection of AMF when attaching a UE in situations where the route to the AMF cannot be determined based on the information provided by the UE;

[0335] - Routing to user plane data towards UPF;

[0336] - Routing of control plane information toward AMF;

[0337] - Setting and canceling connections;

[0338] - Scheduling and sending paging messages;

[0339] - The scheduling and transmission of system broadcast information (originating from AMF or Operation, Admission, and Maintenance functions (OAM));

[0340] - Setting up measurements and measurement reports for mobility and scheduling;

[0341] - Packet markings for transmission class in the uplink;

[0342] -Session management;

[0343] -Support for network slicing;

[0344] - QoS (Quality of Service) flow management and mapping to data radio bearers;

[0345] Support for UEs in RRC_INACTIVE (RRC inactive) state;

[0346] - NAS (Non-Access Stratum) message distribution function;

[0347] - Sharing of wireless access networks;

[0348] - Dual connectivity;

[0349] - Close collaboration between NR and E-UTRA (Evolved Universal Terrestrial Radio Access).

[0350] The Access and Mobility Management Function (AMF) administers the following main functions:

[0351] - Function to terminate Non-Access Stratum (NAS) signaling;

[0352] -Security of NAS signaling;

[0353] - Security controls at the access layer (AS);

[0354] - Core Network (CN) inter-node signaling for mobility between 3GPP access networks;

[0355] - The possibility of a UE reaching idle mode (including control and execution of paging retransmission);

[0356] -Management of the registered area;

[0357] - Support for intra-system mobility and inter-system mobility;

[0358] -Access authentication;

[0359] - Access licenses that include roaming permission checks;

[0360] - Mobility management controls (subscription and policies);

[0361] -Support for network slicing;

[0362] - Selection of Session Management Function (SMF).

[0363] In addition, the User Face Function (UPF) hosts the following main functions:

[0364] - Anchor points for intra-RAT (Radio Access Technology) mobility / inter-RAT (where applicable) mobility;

[0365] - External PDU (Protocol Data Unit) session points used for interconnection with data networks;

[0366] - Packet routing and forwarding;

[0367] - Enforcement of policy rules in group checks and user-facing aspects;

[0368] - Reports on business usage;

[0369] - Uplink classifier used to support routing of service flows toward the data network;

[0370] - Branching points used to support multi-homed PDU sessions;

[0371] - For user plane QoS processing (e.g., packet filtering, gating, UL / DL rate enforcement);

[0372] - Uplink service verification (SDF (Service Data Flow) mapping to QoS flow);

[0373] - Downlink packet buffering and downlink data notification triggering functions.

[0374] Finally, the Session Management Function (SMF) administers the following main functions:

[0375] -Session management;

[0376] - The allocation and management of UE IP addresses;

[0377] -Selection and control of UPF;

[0378] - A function for setting traffic steering in the User Plane Function (UPF) to direct traffic to the appropriate destination;

[0379] - Enforcing policies and QoS in the control section;

[0380] - Notification of downlink data.

[0381] <The process of setting up and resetting RRC connection>

[0382] Figure 19 This refers to several interactions between the UE, gNB, and AMF (5GC entity) when the UE in the NAS part transitions from RRC_IDLE (RRC idle) to RRC_CONNECTED (RRC connected) (refer to TS 38.300v15.6.0).

[0383] RRC is a higher-level signaling (protocol) used for UE and gNB configuration. Through this transition, the AMF prepares UE context data (which includes, for example, PDU session context, security keys, UE radio capabilities, and UE security capabilities) and sends it to the gNB along with an initial context setting request. Next, the gNB and UE activate AS security together. The gNB sends a SecurityModeCommand message to the UE, and the UE responds with a SecurityModeComplete message, thereby activating AS security. Then, the gNB sends an RRCReconfiguration message to the UE, and receives an RRCReconfigurationComplete message from the UE for this message, thus performing the reconfiguration of Signaling RadioBearer 2 (SRB2) and Data Radio Bearer (DRB). For signaling-only connections, since SRB2 and DRB are not configured, the steps related to RRC reconfiguration can be omitted. Finally, the gNB notifies the AMF that the configuration process is complete using the Initial Context Setup Reply.

[0384] Therefore, this disclosure provides an entity (e.g., AMF, SMF, etc.) for a fifth-generation core network (5GC), comprising: a control circuit that, upon operation, establishes a Next Generation (NG) connection with a gNodeB; and a transmission unit that, upon operation, transmits an initial context setting message to the gNodeB via the NG connection to configure the signaling radio bearer between the gNodeB and the User Equipment (UE). Specifically, the gNodeB transmits Radio Resource Control (RRC) signaling containing an Information Element (IE) to the UE via the signaling radio bearer. The UE then performs uplink transmission or downlink reception based on the resource allocation settings.

[0385] <Application Scenarios of IMT after 2020>

[0386] Figure 20This section outlines several use cases for 5G NR. Within the 3rd Generation Partnership Project New Radio (3GPP NR), three use cases supporting a wide variety of services and applications, conceived through IMT-2020, have been studied. Planning for the first phase of specifications for enhanced mobile broadband (eMBB) has been completed. Current and future work, in addition to gradually expanding eMBB support, includes standardization for ultra-reliable and low-latency communications (URLLC) and massive machine-type communications (mMTC). Figure 20 Several examples illustrating conceptual application scenarios for IMT after 2020 (e.g., referring to ITU-R M.2083). Figure 2 ).

[0387] URLLC use cases have strict requirements related to performance aspects such as throughput, latency, and availability. URLLC is conceived as a key technology for enabling wireless control of future industrial production or manufacturing processes, remote medical surgery, automation of power transmission and distribution in smart grids, and traffic safety applications. Ultra-high reliability of URLLC is supported by defining technologies that meet the requirements set by TR38.913. In NR URLLC version 15, a crucial requirement is a target user plane latency of 0.5ms in the UL (uplink) and 0.5ms in the DL (downlink). For a single packet transmission, the overall requirement for URLLC is a block error rate (BLER) of 1E-5 for a 32-byte packet size with a user plane latency of 1ms.

[0388] Considering the physical layer, numerous methods are available to improve reliability. Current possibilities for reliability enhancement include defining alternative CQI (Channel Quality Indicator) tables for URLLC, a more compact DCI (Downlink Control Information) format, and PDCCH iteration. However, as NR (a crucial prerequisite for NR URLLC) becomes more stable and is further developed, this scope can be expanded to achieve ultra-high reliability. Specific use cases for NR URLLC in version 15 include augmented reality / virtual reality (AR / VR), e-health, e-safety, and other critical applications.

[0389] Furthermore, the technical enhancements for NR URLLC aim to improve latency and reliability. Latency enhancements include configurable parameter sets, non-slot-based scheduling utilizing flexible mapping, unlicensed (already licensed) uplinks, slot-level repetition in the data channel, and pre-emption in the downlink. Pre-emption means stopping transmissions with allocated resources and using those resources for later-requested transmissions that require lower latency / higher priority. Therefore, a permitted transmission is replaced by a subsequent transmission. Pre-emption can be applied regardless of the specific service type. For example, a transmission in service type A (URLLC) can be replaced by a transmission in service type B (eMBB, etc.). Reliability enhancements include a dedicated CQI / MCS (Modulation and Coding Scheme) table for a target BLER of 1E-5.

[0390] The use cases for mMTC (massive machine-type communications) are characterized by a large number of connected devices that transmit relatively small amounts of data that are not easily affected by latency. These devices require low cost and very long battery life. From NR's perspective, utilizing very narrow bandwidth is a solution to save UE power and extend its battery life.

[0391] As mentioned above, the potential for improved reliability in NR is further expanded. It is one of the essential conditions for all situations; for example, high or ultra-high reliability is a crucial requirement related to URLLC and mMTC. From both wireless and network perspectives, reliability can be improved through several mechanisms. Generally, there are two to three important areas that could potentially contribute to improved reliability. These areas include compact control channel information, data / control channel iteration, and diversity related to the frequency, time, and / or spatial domains. These areas can be used universally to improve reliability, independent of specific communication scenarios.

[0392] Regarding NR URLLC, further use cases with more stringent requirements are envisioned, such as factory automation, transportation, and power transmission. Stricter requirements refer to high reliability (reaching level 10⁻⁶), high availability, a packet size of 256 bits, and time synchronization of approximately several microseconds (μs) (capable of corresponding to use cases, with values ​​set to 1 μs or several microseconds depending on the frequency range and short latency of approximately 0.5ms to 1ms (e.g., 0.5ms latency in the target user plane)).

[0393] Furthermore, from a physical layer perspective, there are several technical enhancements to NR URLLC. These enhancements include strengthening the PDCCH (Physical Downlink Control Channel) associated with compact DCI, PDCCH repetition, and increased PDCCH monitoring. Additionally, enhancements to UCI (Uplink Control Information) are related to enhanced HARQ (Hybrid Automatic Repeat Request) and CSI feedback. Furthermore, there may be enhancements to PUSCH and retransmission / repetition related to micro-slot-level frequency hopping. The term "micro-slot" refers to a transmission time interval (TTI) containing fewer symbols than a time slot (a time slot has 14 symbols).

[0394] <QoS Control>

[0395] 5G's QoS (Quality of Service) model is based on QoS flows, supporting both QoS flows that require guaranteed bit rate (GBR) and QoS flows that do not require guaranteed bit rate (non-GBR QoS flows). Therefore, at the NAS level, QoS flows represent the finest granular QoS classification within a PDU session. QoS flows are determined within a PDU session based on the QoS Flow ID (QFI) transmitted via the encapsulation header through the NG-U interface.

[0396] For each UE, 5GC establishes one or more PDU sessions. For each UE, in conjunction with the PDU session, NG-RAN, for example, refers to the previous text. Figure 19 As explained, at least one Data Radio Bearer (DRB) is established. Additionally, DRBs can be subsequently configured in QoS flows added to this PDU session (when to configure this depends on the NG-RAN). The NG-RAN maps packets belonging to various PDU sessions to various DRBs. NAS-level packet filters in the UE and 5GC are used to associate UL and DL packets with QoS flows, while AS-level mapping rules in the UE and NG-RAN associate UL and DL QoS flows with DRBs.

[0397] Figure 21 This refers to the non-roaming reference architecture of 5G NR (refer to TS 23.501v16.1.0, section 4.23). Application Function (AF) (e.g., hosting...) Figure 20 The external application server (exemplified in the 5G service example) interacts with the 3GPP core network to provide services. For example, it may access a Network Exposure Function (NEF) to support applications that impact service routing, or it may interact with a policy framework (see Policy Control Function (PCF)) for policy control (e.g., QoS control). Based on operator deployment, operators deem trusted application functions capable of directly interacting with associated network functions. Application functions not permitted by the operator to directly access network functions interact with associated network functions via the NEF, using an externally accessible exposing framework.

[0398] Figure 21It also indicates further functional units of the 5G architecture, namely, the Network Slice Selection Function (NSSF), the Network Repository Function (NRF), Unified Data Management (UDM), the Authentication Server Function (AUSF), the Access and Mobility Management Function (AMF), the Session Management Function (SMF), and the Data Network (DN: Data Network, such as services provided by operators, internet access, or services provided by third parties). All or part of the core network's functions and application services can also be deployed and operate in a cloud computing environment.

[0399] Therefore, this disclosure provides an application server (e.g., an AF in a 5G architecture) comprising: a transmitting unit that, in order to establish a PDU session containing a radio bearer between a g node B and a UE corresponding to QoS requirements, sends, during operation, at least one of the following functions (e.g., NEF, AMF, SMF, PCF, UPF, etc.) to the 5GC to provide services using the established PDU session during operation.

[0400] This disclosure can be implemented in software, hardware, or software in cooperation with hardware. The functional blocks used in the above embodiments are implemented partially or entirely as LSIs (Large Scale Integrations), and the processes described in the above embodiments can also be controlled partially or entirely by a single LSI or a combination of LSIs. An LSI can be composed of individual chips or a single chip containing some or all of the functional blocks. An LSI can also include data input and output. Depending on the degree of integration, an LSI can also be called an "IC (Integrated Circuit)," a "System LSI," a "Super LSI," or an "Ultra LSI." The method of integrated circuit implementation is not limited to LSIs; it can also be implemented using dedicated circuits, general-purpose processors, or special-purpose processors. Additionally, FPGAs (Field Programmable Gate Arrays) that can be programmed after LSI fabrication, or reconfigurable processors that can reconfigure the connections or settings of the circuit blocks within an LSI, can also be used. This disclosure can also be implemented for digital or analog processing. Furthermore, if advancements in semiconductor technology or the emergence of other derivative technologies lead to integrated circuit technologies that can replace LSIs, these technologies could also be used to integrate functional blocks. There are also possibilities for applications such as biotechnology.

[0401] This disclosure can be implemented in all kinds of devices, apparatuses, and systems with communication capabilities (collectively referred to as "communication devices"). A communication device may also include a wireless transceiver and processing / control circuitry. The wireless transceiver may also include a receiving unit and a transmitting unit, or perform the functions of these units. The wireless transceiver (transmitting unit, receiving unit) may also include an RF (Radio Frequency) module and one or more antennas. The RF module may also include an amplifier, an RF modulator / demodulator, or similar devices. Non-limiting examples of communication devices include: telephones (mobile phones, smartphones, etc.), tablet computers, personal computers (PCs) (laptops, desktops, laptops, etc.), cameras (digital cameras, digital camcorders, etc.), digital players (digital audio / video players, etc.), wearable devices (wearable cameras, smartwatches, tracking devices, etc.), game consoles, e-book readers, remote health / telemedicine (remote healthcare / medical prescription) devices, vehicles or transportation vehicles with communication capabilities (cars, airplanes, ships, etc.), and combinations of the various devices described above.

[0402] Communication devices are not limited to portable or movable devices, but also include all kinds of devices, equipment, and systems that cannot be carried or fixed. Examples include: smart home devices (home appliances, lighting equipment, smart meters or meters, control panels, etc.), vending machines, and all other "things" that can exist on the IoT (Internet of Things) network.

[0403] In addition to data communication via cellular systems, wireless LAN (Local Area Network) systems, and communication satellite systems, communication also includes data communication via a combination of these systems.

[0404] In addition, the communication device also includes devices such as controllers or sensors that are connected or linked to a communication device performing the communication functions described in this disclosure. For example, it includes a controller or sensor that generates control signals or data signals used by the communication device to perform the communication functions of the communication device.

[0405] In addition, the communication device includes infrastructure equipment that communicates with or controls the various devices described above (not limited to these), such as base stations, access points, and all other devices, equipment, and systems.

[0406] One embodiment of the present disclosure may include a terminal that includes: a control circuit that generates information related to the coordinated use of sidelink resources between terminals; and a transmission circuit that transmits the information to other terminals.

[0407] In one embodiment of this disclosure, the information may include at least one of the following: information on resources reserved for transmission by the other terminals, information on resources reserved for transmission by the transmission circuit, information on resources recommended for use by the other terminals, and information on resources not recommended for use by the other terminals.

[0408] In one embodiment of this disclosure, the control circuit may not transmit data from the transmitting circuit if the information indicates available resources.

[0409] In one embodiment of this disclosure, the control circuit may configure the information in the data channel of the side link, and the transmitting circuit may transmit side link control information indicating that the information is transmitted in the data channel of the side link to the other terminal.

[0410] In one embodiment of this disclosure, the control circuit may configure the information in the second sidelink control information, and the sending circuit may send the second sidelink control information or the first sidelink control information indicating that the information is sent in the second sidelink control information to the other terminal.

[0411] In one embodiment of this disclosure, the control circuit may configure the information in a feedback channel of a side link, and in the terminal, based on prior communication with the other terminals, it is agreed that the information will be sent in the feedback channel.

[0412] In one embodiment of this disclosure, the control circuit may configure the information in first sidelink control information, which includes resource allocation information for a terminal that is different from the sending source of the first sidelink control information, i.e., the terminal.

[0413] One embodiment of the present disclosure may include a terminal that includes: a receiving circuit that receives information from other terminals related to the coordinated use of sidelink resources between terminals; and a control circuit that, based on the information, determines the resources to be transmitted in the sidelink.

[0414] In one embodiment of the sidelink communication control method disclosed herein, a first terminal may send information related to the coordinated use of sidelink resources between terminals; and a second terminal that receives the information may determine the resources to be sent in the sidelink based on the information.

[0415] The entire contents of the specification, drawings and abstract of the specification contained in Japanese Patent Application No. 2020-134851, filed on August 7, 2020, are incorporated herein by reference.

[0416] Industrial applicability

[0417] One embodiment of this disclosure is useful for wireless communication systems.

[0418] Explanation of reference numerals in the attached figures

[0419] 100 base stations

[0420] 101 Resource Utilization Adjustment Information Setting Department

[0421] 103 Error Correction Coding Department

[0422] 104 Modulation Section

[0423] 106 Sending Department

[0424] 107 Receiving Department

[0425] 109 Mediation Department

[0426] 110 Error Correction and Decoding Department

[0427] 200 terminals

[0428] 201 Receiving Department

[0429] 202 Signal Separation Unit

[0430] 203 De-escalation Department

[0431] 203-1Uu Demodulation Unit

[0432] 203-2SL Demodulation Unit

[0433] 204 Error Correction Decoding Department

[0434] 204-1Uu Error Correction Decoding Department

[0435] 204-2SL Error Correction Decoding Department

[0436] 205 Resource Utilization Adjustment Information Receiving Department

[0437] 206 Resource Utilization Adjustment Information Generation Department

[0438] 207 Error Correction Coding Department

[0439] 207-1Uu Error Correction Coding Department

[0440] 207-2SL Error Correction Coding Department

[0441] 208 Modulation Section

[0442] 208-1Uu Modulation Unit

[0443] 208-2SL Modulation Section

[0444] 209 Signal Distribution Section

[0445] 210 Sending Department

[0446] 211-1 First Phase SCI Receiving Department

[0447] 211-2 Second Phase SCI Receiving Department

[0448] 212-1 First Stage SCI Generation Department

[0449] 212-2 Second Stage SCI Generation Department

Claims

1. A communication device, comprising: The control circuit generates information related to the coordinated use of sidelink resources among UEs. as well as The transmitting circuit sends second sidelink control information containing the aforementioned information to other communication devices. in The second and third sidelink control information are configured on the sidelink data channel, wherein the third sidelink control information does not include the aforementioned information. The transmitting circuit transmits first sidelink control information, which includes a bit field representing one of the second sidelink control information and the third sidelink control information.

2. The communication device as claimed in claim 1, wherein, The information includes at least one of the following: information on resources reserved for transmission by the other communication device, information on resources reserved for transmission by the transmission circuit, information on resources recommended for use by the other communication device, and information on resources not recommended for use by the other communication device.

3. The communication device as claimed in claim 1, wherein, The control circuit prevents other communication devices from transmitting within resources that are available as indicated by the information.

4. The communication device as claimed in claim 1, wherein, The transmitting circuit sends the first sidelink control information, indicating that the information is being transmitted in the sidelink data channel, to the other communication device.

5. The communication device as claimed in claim 1, wherein, The control circuit configures the information in the feedback channel of the side link, and, If other communication devices request the information, it is agreed that the information will be sent in the feedback channel.

6. A communication device, comprising: The receiving circuit receives second sidelink control information from other communication devices, which includes information related to the coordinated use of sidelink resources among UEs. as well as Based on the information, the control circuit determines the resources for transmission in the side link. in The second and third sidelink control information are configured on the sidelink data channel, wherein the third sidelink control information does not include the aforementioned information. The receiving circuit receives first sidelink control information, which includes a bit field representing one of the second sidelink control information and the third sidelink control information.

7. A side-link communication control method, comprising, The first communication device sends second sidelink control information, which includes information related to the coordinated use of sidelink resources among UEs; and... The second communication device, upon receiving the information, determines the resources for transmission in the side link based on that information. in The second and third sidelink control information are configured on the sidelink data channel, wherein the third sidelink control information does not include the aforementioned information. The first communication device sends first sidelink control information, which includes a bit field representing one of the second sidelink control information and the third sidelink control information.

8. A side-link communication control method executed by a communication device, comprising: A second sidelink control message is generated, which includes information related to the coordinated use of sidelink resources among UEs; and, Send the information to other communication devices. in The second and third sidelink control information are configured on the sidelink data channel, wherein the third sidelink control information does not include the aforementioned information. The method further includes sending first sidelink control information, the first sidelink control information including a bit field representing one of the second sidelink control information and the third sidelink control information.

9. An integrated circuit, comprising a circuit configured to: The control generates second sidelink control information, which includes information related to the coordinated use of sidelink resources among UEs; and Control the transmission of the information to other communication devices. in The second and third sidelink control information are configured on the sidelink data channel, wherein the third sidelink control information does not include the aforementioned information. The circuit is also configured to control the transmission of first sidelink control information, the first sidelink control information including a bit field representing one of the second sidelink control information and the third sidelink control information.

10. A side-link communication control method executed by a communication device, comprising: Receive second sidelink control information from other communication devices, which includes information related to the coordinated use of sidelink resources among UEs; and, Based on the information provided, the resources for transmission in the side link are determined. in The second and third sidelink control information are configured on the sidelink data channel, wherein the third sidelink control information does not include the aforementioned information. The method further includes receiving first sidelink control information, the first sidelink control information including a bit field representing one of the second sidelink control information and the third sidelink control information.

11. An integrated circuit, comprising a circuit configured to: The control receives second sidelink control information from other communication devices, which includes information related to the coordinated use of sidelink resources among UEs; and Based on the information provided, the resources for transmission in the side link are determined. in The second and third sidelink control information are configured on the sidelink data channel, wherein the third sidelink control information does not include the aforementioned information. The circuit is also configured to control the reception of first sidelink control information, the first sidelink control information including a bit field representing one of the second sidelink control information and the third sidelink control information.

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