Terminal, receiving method and integrated circuit

Abstract

To improve the transmission efficiency of wireless communication.SOLUTION: A terminal includes a circuit that determines a placement of one or more channels in a time interval on the basis of information regarding the number of symbols available in the time interval, and a transmitter that transmits the channels according to the placement.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a terminal, a receiving method, and an integrated circuit. [Background technology]

[0002] A communication system called the fifth generation mobile communication system (5G) is currently under consideration. With 5G, it is being considered how to flexibly provide functions for each use case that requires an increase in high-speed communication traffic, an increase in the number of connected terminals, high reliability, and low latency. The international standardization organization, the 3rd Generation Partnership Project (3GPP), is considering the sophistication of communication systems from both the perspectives of Long Term Evolution (LTE) systems and New Radio (NR).

[0003] In 3GPP, support for vehicle to everything (V2X) has been considered in the LTE system. Support for V2X is also being considered in NR, which can use a wider bandwidth than the LTE system (see, for example, Non-Patent Document 1). [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TR 38.885 V16.0.0, "Study on NR Vehicle-to-Everything (V2X) (Release 16), 2019-03 Summary of the Invention [Problem to be solved by the invention]

[0005] However, there is room for further study on a signal transmission method that improves the transmission efficiency of wireless communication.

[0006] Non-limiting embodiments of the present disclosure contribute to providing a terminal, a receiving method, and an integrated circuit that can improve the transmission efficiency of wireless communication. [Means for solving the problem]

[0007] A terminal according to one embodiment of the present disclosure includes a circuit for determining an arrangement of one or more channels in a time interval based on information regarding the number of symbols available in the time interval, and a transmitter for transmitting the channels according to the arrangement.

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

[0009] According to an embodiment of the present disclosure, it is possible to improve the transmission efficiency of wireless communication.

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

[0011] [Figure 1] A diagram showing an example of the format of the physical sidelink feedback channel (PSFCH) [Diagram 2] FIG. 13 is a diagram showing an example of a symbol configuration of a side link. [Diagram 3] Block diagram showing an example of a partial configuration of a terminal [Figure 4] Block diagram showing an example of the configuration of a base station [Diagram 5] Block diagram showing an example of a terminal configuration [Figure 6] Flowchart showing an example of the operation of a terminal [Figure 7] FIG. 13 is a diagram showing an example of sidelink channel arrangement according to the first operation example; [Figure 8] FIG. 13 is a diagram showing an example of sidelink channel allocation according to an operation example 2; [Figure 9] FIG. 13 is a diagram showing an example of sidelink channel allocation according to an operation example 3. [Figure 10] FIG. 13 is a diagram showing an example of sidelink channel arrangement according to an operation example 4. [Figure 11] FIG. 13 is a diagram showing an example of sidelink channel arrangement according to operation example 5. [Figure 12] FIG. 13 is a diagram showing an example of sidelink channel allocation according to the sixth operation example; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0013] V2X envisions, for example, communication between vehicles (V2V: Vehicle to Vehicle), between a road and a vehicle (V2I: Vehicle to Infrastructure), between a pedestrian and a vehicle (V2P: Vehicle to Pedestrian), or between vehicle networks (V2N: Vehicle to Network).

[0014] In V2V, V2I, or V2P, for example, direct transmission and reception can be performed between terminals (also called user equipment (UE)) using a link called "sidelink (SL)" or "PC5" without going through a network with a base station (for example, base station (BS), or also called gNB in ​​NR, or eNB in ​​LTE). In addition, in V2N, for example, communication via a link (for example, called "Uu") between a base station and a terminal is assumed.

[0015] The resources used for the sidelink are set, for example, by the SL Band width part (BWP) and a resource pool.

[0016] The SL BWP is, for example, a frequency band that a terminal can use for a side link. The SL BWP is set separately from a Downlink (DL) BWP and an Uplink (UL) BWP set in a link (for example, a Uu link) between a base station and a terminal. Note that the frequency bands may overlap between the SL BWP and the UL BWP.

[0017] The resource pool includes, for example, resources in the frequency direction and the time direction specified in the resources in the SL BWP. For example, multiple resource pools may be configured for one terminal.

[0018] [Sidelink in NR] In NR V2X, support for, for example, unicast, groupcast, and broadcast is being considered for transmission and reception on the sidelink.

[0019] Unicast assumes, for example, one-to-one transmission from a transmitting terminal (also called, for example, transmitter UE or Tx UE) to a receiving terminal (for example, receiver UE or Rx UE). Groupcast assumes, for example, transmission from a transmitting terminal to multiple receiving terminals included in a certain group. Broadcast assumes, for example, transmission from a transmitting terminal without specifying a receiving terminal.

[0020] In addition, for the NR sidelink, for example, the following channel settings are being considered:

[0021] <PSCCH:physical SL control channel> In the PSCCH, for example, a control signal called sidelink control information (SCI) is transmitted and received. The SCI includes information related to the transmission and reception of the PSSCH, such as resource allocation information for a data signal (for example, a PSSCH (physical SL shared channel)).

[0022] Also, for example, the SCI may include information about the transmitting terminal (for example, Layer 1 source ID) and information about the receiving terminal (for example, Layer 1 destination ID). This information identifies the transmitting terminal and the receiving terminal.

[0023] <pssch> In the PSSCH, for example, data signals are transmitted and received.

[0024] <psfch> In the PSFCH, for example, a feedback signal (e.g., hybrid automatic repeat request (HARQ) feedback) for the PSSCH (e.g., a data signal) is transmitted and received. The feedback signal may include, for example, a response signal indicating an ACK or a NACK (e.g., ACK / NACK information, also referred to as HARQ-ACK). It is being considered that the feedback signal is applied, for example, to cases where the PSSCH is transmitted and received by unicast and groupcast. The ACK and NACK may be referred to, for example, as HARQ-ACK and HARQ-NACK, respectively.

[0025] <PSBCH:physical SL broadcast channel> Broadcast signals are transmitted and received on the PSBCH.

[0026] [PSFCH] Next, the PSFCH will be described.

[0027] In the unicast in the sidelink, for example, the receiving terminal generates an ACK when it determines that the decoding of the received data has been successful, and generates a NACK when it determines that the decoding of the data has failed. Then, the receiving terminal transmits, for example, a feedback signal including ACK / NACK information indicating the generated ACK or NACK, via the PSFCH.

[0028] In groupcast in the sidelink, for example, two methods are under study for transmitting a feedback signal in the PSFCH.

[0029] The first method is, for example, a method of transmitting a feedback signal on the PSFCH, as in the case of unicast. The second method is, for example, a method of transmitting a NACK on the PSFCH when the receiving terminal determines that it has failed to decode the received data, and not transmitting an ACK when it has successfully decoded the data.

[0030] In groupcast, for example, feedback signals are transmitted from multiple receiving terminals to a transmitting terminal. For example, as in the second method, since the receiving terminal does not transmit an ACK, feedback signals (in other words, NACKs) can be multiplexed and transmitted between multiple terminals on the same PSFCH. On the other hand, as in the first method, when each terminal transmits either an ACK or a NACK, for example, a resource region of the PSFCH (hereinafter referred to as a PSFCH region) is divided for each terminal.

[0031] Next, an example of the format of the PSFCH will be described.

[0032] 1(a), (b) and (c) show an example of a PSFCH format. For example, FIG. 1(a) shows a format in which information is notified by a sequence, such as NR PUCCH format 0, and PSFCH is arranged in one symbol. FIG. 1(b) shows a format in which PSFCH is arranged in multiple symbols by repeating (in other words, repetition) the format of one symbol PSFCH. Also, FIG. 1(c) shows a format in which PSFCH is arranged in multiple symbols, such as NR PUCCH format 2.

[0033] The PSFCH may be arranged in a symbol that does not overlap with the PSCCH and PSSCH (e.g., see Figures 1(a) and 1(b)) after (e.g., at the very end) of symbols available for sidelink in a slot (in other words, a certain time period) (hereinafter referred to as sidelink symbols or SL symbols) and may be frequency-multiplexed with the PSSCH (e.g., see Figure 1(c)).

[0034] As described above, the PSFCH is a channel for transmitting a feedback signal for the PSSCH. For example, a receiving terminal receives a PSSCH signal, decodes the PSSCH signal, and transmits a feedback signal including a result of determining whether the PSSCH has been successfully decoded by a cyclic redundancy check (CRC) on the PSFCH.

[0035] Furthermore, the PSFCH transmission timing (in other words, the transmission timing of the PSFCH) may be set by considering the time required for processing in the receiving terminal, such as decoding the PSSCH or generating a PSFCH signal. For example, the transmission timing of the PSFCH may be set in advance to a certain number of slots or symbols after the slot in which the PSSCH was received. In addition, when the transmission of the PSSCH is instructed by the PSCCH, the resource of the PSFCH may also be specified.

[0036] In addition, the PSFCH shown in Fig. 1 is not limited to a case where it corresponds to feedback for a PSSCH in the same slot as the PSFCH, and may correspond to feedback for a PSSCH several slots earlier, for example. For example, the PSFCH shown in Fig. 1(c) cannot transmit feedback for a PSSCH in the same slot by FDM. Therefore, the PSFCH shown in Fig. 1(c) is a channel that transmits a feedback signal for a previous PSSCH (not shown).

[0037] [Sidelink communication mode] Sidelink communication has, for example, two modes (e.g., Mode 1 and Mode 2).

[0038] In Mode 1, the base station determines (in other words, schedules) resources (for example, referred to as SL resources) to be used by a terminal in the side link.

[0039] In Mode 2, the terminal determines the SL resource from resources in a pre-configured resource pool. In other words, in Mode 2, the base station does not schedule the SL resource.

[0040] Mode 1 is assumed to be used in an environment where the base station and terminal are connected and the terminal can receive instructions from the base station for sidelink communication. Mode 2 allows the terminal to transmit even without instructions from the base station, so sidelink communication is possible with terminals under different operators or terminals outside the coverage area.

[0041] The side link has been described above.

[0042] In the NR V2X sidelink, channel placement (in other words, also called mapping or allocation) has not been sufficiently considered.

[0043] For example, when DL communication and sidelink communication of a link (e.g., a Uu link) between a base station and a terminal are performed on the same component carrier (CC) or adjacent (e.g., adjacent) carriers, a terminal receiving a DL signal transmitted from the base station may be subject to interference from the sidelink communication, resulting in deterioration of DL reception quality.

[0044] In order to reduce the interference caused by sidelink communication to DL signals, for example, SL resources may use UL symbols of Uu but not DL symbols of Uu.

[0045] For example, in Mode 2, it is assumed that the terminal will not be able to receive instructions from the base station, and therefore, it is assumed that the SL resources will not use DL symbols of Uu, but will use UL symbols.

[0046] Also, in Mode 1, it may be configured to use UL symbols instead of DL symbols of Uu for SL resources. Alternatively, in Mode 1, since the terminal is instructed by the base station which resources to use, it is assumed that flexible symbols are used in SL resources in addition to UL symbols of Uu. Note that flexible symbols are symbols that may be used for both DL and UL. In the Uu link, flexible symbols are configured in the terminal by, for example, higher layer signaling. Furthermore, symbols configured as flexible symbols can be assigned to either DL symbols or UL symbols by, for example, group common downlink control information (DCI) (or called DCI format 2_0) or instructions from individual DCI.

[0047] FIG. 2 shows an example of a symbol configuration for the sidelink.

[0048] In the example shown in FIG. 2, slot #0 and slot #2 are slots included in the resource pool used for the side link, and slot #1 is a slot that is not included in the resource pool used for the side link.

[0049] In the example shown in Fig. 2, for example, in Mode 1, UL symbols (e.g., represented by "U") or Flexible symbols (e.g., represented by "F") in the Uu link (link between gNB and UE) can be used for the sidelink. The SL symbols in a slot can be set, for example, separately from the symbol setting of Uu. Symbols indicated by "X" in Fig. 2 are symbols not used for the sidelink, and symbols indicated by "SL" are SL symbols used for the sidelink. As shown in Fig. 2, even if a symbol is a Flexible symbol or a UL symbol in Uu, some symbols may not be set as SL symbols.

[0050] 2, for example, the UL symbol (U) in the Uu link can be used for the side link in Mode 2. Also, in Mode 2, as in Mode 1, the SL symbol in a slot can be set separately from the symbol setting of Uu, for example.

[0051] In both Mode 1 and Mode 2, the configuration method for the sidelink, such as the slot number included in the resource pool and the symbol configuration within the slot (e.g., the symbols represented by "X" and "SL"), is configured in the terminal.

[0052] The configuration method for the sidelink may, for example, be pre-configured in a specification (e.g., a standard), may be pre-configured in an application layer called "pre-configured", may be pre-configured in a subscriber identity module (SIM) installed in a terminal, or may be configured by higher layer signaling (e.g., higher layer parameters) such as a system information block (SIB) called "configured" or other radio resource control (RRC).

[0053] In addition, the slot-based setting and the symbol-based setting of the SL resource may be configured simultaneously or separately. For example, when the slot-based setting and the symbol-based setting of the sidelink are configured separately, the update frequency of each setting may be different.

[0054] As shown in the example of Fig. 2, in the Uu link, the settings of DL symbols, Flexible symbols, and UL symbols (e.g., the number and position pattern of each symbol) may differ for each slot. Therefore, the settings of SL symbols (e.g., the number and positions of SL symbols) may also differ for each slot in the resource pool.

[0055] Here, the smaller the number of SL symbols in a slot, the smaller the amount of resources to which sidelink signals are assigned, and the smaller the transport block size (TBS). The smaller the TBS, the lower the coding gain, and the higher the ratio of overhead of control signals to data signals. In addition, in sidelink communication, for example, when the same TBS is set for initial transmission and retransmission, the smaller the TBS for initial transmission, the smaller the TBS for retransmission is set, so that the retransmission efficiency decreases. In this way, the number of SL symbols in a slot may not be suitable for transmitting and receiving data signals in the PSSCH, and the transmission efficiency of sidelink communication may decrease.

[0056] Although the PSSCH has been described here, similarly for other sidelink channels (for example, PSCCH, PSFCH, or PSBCH), there may be cases where the number of SL symbols in a slot is not suitable for transmitting and receiving signals.

[0057] Therefore, in one embodiment of the present disclosure, a method for improving the transmission efficiency of sidelink communication is described.

[0058] For example, in one embodiment of the present disclosure, the setting value (e.g., minimum value) of the number of SL symbols per slot is changed depending on the channel for transmitting and receiving signals in the sidelink. By setting the number of SL symbols in this way, for example, different numbers of symbols can be secured depending on the channel allocated to the slot, and the transmission efficiency of the sidelink communication can be improved.

[0059] (Embodiment 1) [Communication system overview] The communication system according to this embodiment includes base station 100 and terminal 200.

[0060] Fig. 3 is a block diagram showing a configuration example of a part of terminal 200 according to this embodiment. In terminal 200 shown in Fig. 3, signal allocation unit 217 (e.g., equivalent to a circuit) determines an arrangement of one or more channels in a certain time interval (e.g., slot) based on information on the number of symbols available in the time interval. Transmitting unit 218 (e.g., equivalent to a transmitter) has a transmitter that transmits the channels according to the arrangement.

[0061] [Base station configuration] Fig. 4 is a block diagram showing an example of the configuration of base station 100 according to this embodiment. In Fig. 4, base station 100 includes PSFCH setting section 101, resource pool setting section 102, error correction coding section 103, modulation section 104, signal allocation section 105, transmission section 106, reception section 107, signal separation section 108, demodulation section 109, and error correction decoding section 110.

[0062] The PSFCH setting unit 101 sets a slot in which the PSFCH is arranged for each resource pool to be allocated to the terminal 200, for example, based on resource pool setting information input from the resource pool setting unit 102. The PSFCH setting unit 101 may set, for example, a period of the slot in which the PSFCH is arranged (in other words, a transmission period of the PSFCH; hereinafter, represented as “N”). Alternatively, the PSFCH setting unit 101 may set, for example, a shift amount of the slot in which the PSFCH is arranged (hereinafter, represented as “L”). The PSFCH setting unit 101 generates information on the PSFCH (hereinafter, referred to as PSFCH setting information) determined by at least one of the period N and the shift amount L, for example, and outputs the information to the resource pool setting unit 102. Furthermore, the PSFCH setting unit 101 outputs higher layer signaling including the PSFCH setting information to the error correction coding unit 103.

[0063] The resource pool setting unit 102 sets a resource pool to be used for the side link for each terminal 200. For example, the resource pool setting unit 102 generates information on time resources and frequency resources of the resource pool (hereinafter referred to as resource pool setting information). For example, the resource pool setting unit 102 may set time resources (e.g., symbols) available for the resource pool to UL symbols of a link (e.g., Uu link) between the base station and the terminal. Alternatively, in Mode 1, the resource pool setting unit 102 may set symbols available for the resource pool to UL symbols and Flexible symbols of the Uu link.

[0064] Furthermore, the resource pool setting unit 102 determines whether or not the number of symbols in a slot in which each channel (for example, PSCCH, PSSCH, and PSFCH) is allocated satisfies a predetermined number of symbols (hereinafter also referred to as a setting value), for example, based on the PSFCH setting information input from the PSFCH setting unit 101. For example, the resource pool setting unit 102 determines whether or not the number of symbols in a slot in which the PSCCH, PSSCH, and PSFCH are allocated is equal to or greater than a setting value of the number of symbols (for example, values ​​such as Y1 to Y8 described later), based on the PSFCH setting information input from the PSFCH setting unit 101.

[0065] The setting value of the number of symbols (in other words, the threshold value) may be set according to at least one of the channel type, such as PSCCH, PSSCH, PSFCH, or PSBCH, and the combination of channels set in the slot (for example, PSCCH and PSSCH).

[0066] When the number of symbols in a slot in which each channel is allocated is equal to or greater than a set value, resource pool setting unit 102 outputs higher layer signaling including resource pool setting information to error correction coding unit 103. Furthermore, resource pool setting unit 102 outputs the resource pool setting information to PSFCH setting unit 101, signal allocation unit 105, and signal separation unit 108. When the number of symbols in a slot in which each channel is allocated is less than a set value, resource pool setting unit 102 does not need to output the resource pool setting information.

[0067] Error correction coding section 103 receives as input a transmission data signal (DL data signal) and higher layer signaling received from PSFCH setting section 101, performs error correction coding on the input signal, and outputs the coded signal to modulation section 104.

[0068] The modulation section 104 performs modulation processing on the signal input from the error correction coding section 103 and outputs the modulated data signal to the signal allocation section 105 .

[0069] The signal allocating unit 105, for example, identifies slots available in a link (e.g., Uu link) between the base station 100 and the terminal 200 and slots available for sidelink communication, based on information input from the resource pool setting unit 102. Then, the signal allocating unit 105 allocates a data signal (e.g., DL data signal or higher layer signaling) input from the modulating unit 104 to resources available in the Uu link. The formed transmission signal is output to the transmitting unit 106.

[0070] The resource pool settings may be different for each terminal 200. In this case, the slots available for use in the Uu link are different for each terminal 200.

[0071] Transmitting section 106 performs radio transmission processing such as up-conversion on the signal input from signal allocating section 105, and transmits the signal to terminal 200 via an antenna.

[0072] Receiving section 107 receives the signal transmitted from terminal 200 via an antenna, performs radio reception processing such as down-conversion on the signal, and outputs the signal to signal separating section 108.

[0073] The signal separator 108 identifies, for example, slots available for use in the Uu link and slots available for use in sidelink communication, based on, for example, information input from the resource pool setting unit 102. Then, the signal separator 108 separates the signals assigned to the resources available for use in the Uu link, which are input from the receiving unit 107. The signal separator 108 outputs the separated signals (for example, UL data signals) to the demodulator 109.

[0074] The demodulation section 109 performs demodulation processing on the signal input from the signal separation section 108 , and outputs the obtained signal to the error correction decoding section 110 .

[0075] Error correction decoding section 110 decodes the signal inputted from demodulation section 109 and obtains a received data signal from terminal 200 (UL data signal).

[0076] In the example illustrated in FIG. 4, the base station 100 includes the PSFCH setting unit 101 and the resource pool setting unit 102, and generates higher layer signaling including the PSFCH setting information and the resource pool setting information. However, the present invention is not limited to this. For example, at least one of the PSFCH setting information and the resource pool setting information may be set in an application layer called Pre-configured, or may be set in advance in the SIM. In this case, the base station 100 may use the information set in advance without generating the PSFCH setting information or the resource pool setting information. For example, the base station 100 may recognize slots available between the base station 100 and the terminal 200 based on the resource pool setting information set in advance, and output information indicating slots available between the base station 100 and the terminal 200 to the signal allocation unit 105 and the signal separation unit 108.

[0077] [Device configuration] Fig. 5 is a block diagram showing an example of the configuration of terminal 200 according to this embodiment. In Fig. 5, terminal 200 has receiving section 201, signal separating section 202, SCI receiving section 203, Uu demodulating section 204, Uu error correction decoding section 205, SL demodulating section 206, SL error correction decoding section 207, PSFCH receiving section 208, ACK / NACK generating section 209, PSFCH setting section 210, resource pool setting section 211, SCI generating section 212, Uu error correction encoding section 213, Uu modulating section 214, SL error correction encoding section 215, SL modulating section 216, signal allocating section 217, and transmitting section 218.

[0078] The receiving unit 201 receives a reception signal via an antenna, performs reception processing such as down-conversion, and outputs the received signal to the signal separating unit 202 .

[0079] Based on the resource pool setting information input from the resource pool setting unit 211, the signal separation unit 202 separates the signal components corresponding to the link (e.g., Uu link) between the base station 100 and the terminal 200 from the signal input from the receiving unit 201, and outputs the signal components to the Uu demodulation unit 204.

[0080] Furthermore, based on the resource pool setting information, the signal separating unit 202 separates side link signal components from the signals input from the receiving unit 201. Then, the signal separating unit 202 outputs, for example, a PSCCH signal from the side link signal components to the SCI receiving unit 203. Furthermore, based on the resource allocation information input from the SCI receiving unit 203, the signal separating unit 202 separates a PSSCH signal addressed to the terminal 200 from the side link signal components input from the receiving unit 201, and outputs the PSSCH signal to the SL demodulating unit 206.

[0081] Furthermore, the signal separating unit 202 specifies a resource in which the PSFCH is arranged (e.g., a resource to which a feedback signal transmitted from another terminal is allocated) based on the PSFCH setting information input from the PSFCH setting unit 210 and the resource pool setting information input from the resource pool setting unit 211. For example, the signal separating unit 202 may specify a resource for a feedback signal (e.g., ACK / NACK information) from another terminal based on information on a slot in which the PSFCH is arranged and information on a PSSCH signal previously transmitted by the terminal 200 to another terminal according to resource allocation information input from the SCI generating unit 212. Then, the signal separating unit 202 outputs information on the specified resource and the signal of the specified resource to the PSFCH receiving unit 208.

[0082] The SCI receiving unit 203 demodulates and decodes the signal component of the PSCCH input from the signal separating unit 202. For example, the SCI receiving unit 203 attempts to demodulate and decode the PSCCH signal, and if the decoding is successful (in other words, if the SCI included in the PSCCH is detected), the SCI receiving unit 203 outputs resource allocation information of the PSSCH addressed to the terminal 200, which is included in the SCI, to the signal separating unit 202. Note that the SCI receiving unit 203 may determine whether or not the information included in the SCI is addressed to the terminal 200, based on, for example, destination information included in the SCI.

[0083] The Uu demodulation unit 204 performs demodulation processing on the signal input from the signal separation unit 202 , and outputs the obtained demodulated signal to the Uu error correction decoding unit 205 .

[0084] The Uu error correction decoding unit 205 decodes the demodulated signal input from the Uu demodulation unit 204, outputs the obtained higher layer signaling to the PSFCH setting unit 210 and the resource pool setting unit 211, and outputs the obtained received data signal (or referred to as the Uu received data signal).

[0085] The SL demodulation unit 206 performs demodulation processing on the signal input from the signal separation unit 202 , and outputs the resulting demodulated signal to the SL error correction decoding unit 207 .

[0086] The SL error correction decoding unit 207 decodes the demodulated signal input from the SL demodulation unit 206, and performs error detection, such as a cyclic redundancy check (CRC), on the decoded signal. The SL error correction decoding unit 207 outputs the detection result to the ACK / NACK generation unit 209. Furthermore, if there is no error in the decoded signal, the SL error correction decoding unit 207 outputs the obtained received data signal (or referred to as a side link received data signal).

[0087] Based on the information received as input from the signal separator 202, the PSFCH receiver 208 receives a feedback signal transmitted from another terminal (for example, ACK / NACK information in response to the PSSCH transmitted by the terminal 200).

[0088] ACK / NACK generation unit 209 generates ACK / NACK information (e.g., information including either ACK or NACK) based on the CRC determination result input from SL error correction decoding unit 207, and outputs the ACK / NACK information to signal allocation unit 217. For example, in the case of a feedback signal for unicast or groupcast, ACK / NACK generation unit 209 may generate ACK / NACK information including either ACK or NACK based on the CRC determination result. Alternatively, for example, in the case of a feedback signal for groupcast, ACK / NACK generation unit 209 may output ACK / NACK information to signal allocation unit 217 in the case of NACK, and may not output ACK / NACK information in the case of ACK.

[0089] The PSFCH setting unit 210 sets a slot in which the PSFCH is arranged, based on, for example, PSFCH setting information included in higher layer signaling input from the Uu error correction decoding unit 205. The slot in which the PSFCH is arranged may be determined, for example, by at least one of the period N and shift amount L of the slot in which the PSFCH is arranged. The PSFCH setting unit 210 outputs the set information to the resource pool setting unit 211, the signal separating unit 202, and the signal allocating unit 217.

[0090] The resource pool setting unit 211 sets a resource pool (for example, time resources and frequency resources) to be used by the terminal 200 for the side link, based on, for example, resource pool setting information included in higher layer signaling input from the Uu error correction decoding unit 205.

[0091] In addition, for example, when a link (e.g., a Uu link) between base station 100 and terminal 200 overlaps with a side link, or when an interfering component carrier or BWP is configured, resource pool setting unit 211 may determine whether the symbol available for the resource pool is a UL symbol of the Uu link, or, in Mode 1, whether the symbol is either a UL symbol or a Flexible symbol.

[0092] Furthermore, the resource pool setting unit 211 determines whether or not the number of symbols in a slot in the resource pool satisfies a condition, for example, based on a slot in which the PSFCH input from the PSFCH setting unit 210 is arranged and a setting value of the number of symbols set for each channel (for example, PSCCH, PSSCH, and PSFCH) based on the resource pool setting information. For example, the resource pool setting unit 211 may determine whether or not the number of symbols in a slot in which at least one of the PSCCH, PSSCH, and PSFCH is arranged is equal to or greater than a setting value of the number of symbols (for example, any one of Y1, Y2, and Y3 described later). If the number of symbols in the slot is equal to or greater than the setting value, the resource pool setting unit 211 outputs the resource setting information to the SCI generating unit 212, the signal separating unit 202, and the signal allocating unit 217. On the other hand, if the number of symbols in the slot is less than the setting value, the resource pool setting unit 211 does not output the resource setting information.

[0093] The SCI generating unit 212 sets resources for transmitting the PSSCH based on, for example, information input from the resource pool setting unit 211 (for example, information indicating slots and resources available for the side link). The SCI generating unit 212 generates an SCI including information on the set resources. The SCI may include, for example, information for identifying the source terminal 200 (for example, a source ID) and information for identifying the destination terminal 200 (for example, a destination ID). The SCI generating unit 212 outputs the generated SCI to the signal separating unit 202 and the signal allocating unit 217.

[0094] The Uu error correction encoder 213 receives a transmission data signal (UL data signal) of the Uu link as input, performs error correction encoding on the transmission data signal, and outputs the encoded signal to the Uu modulator 214 .

[0095] The Uu modulation unit 214 modulates the signal input from the Uu error correction coding unit 213 , and outputs the modulated signal to the signal allocation unit 217 .

[0096] The SL error correction encoding unit 215 receives a side link transmission data signal (side link data signal) as input, performs error correction encoding on the transmission data signal, and outputs the encoded signal to the SL modulation unit 216.

[0097] The SL modulation unit 216 modulates the signal input from the SL error correction coding unit 215 and outputs the modulated signal to the signal allocation unit 217 .

[0098] The signal allocation unit 217 allocates the PSCCH signal including the SCI and the PSSCH signal including the side link data signal input from the SL modulation unit 216 to the side link resources based on, for example, the information input from the resource pool setting unit 211 and the information input from the SCI generation unit 212. Also, the signal allocation unit 217 allocates the ACK / NACK information input from the ACK / NACK generation unit 209 to the side link resources based on, for example, the information of the slot in which the PSFCH is arranged input from the PSFCH setting unit 210. Also, the signal allocation unit 217 allocates, for example, the signal input from the Uu modulation unit 214 to the resources of the Uu link (for example, the uplink data channel (PUSCH: Physical Uplink Shared Channel)). The signal allocation unit 217 outputs the signal allocated to the resources to the transmission unit 218.

[0099] The transmitter 218 performs radio transmission processing such as up-conversion on the signal input from the signal allocation unit 217 and transmits the signal.

[0100] In the example illustrated in FIG. 5, the case has been described in which terminal 200 receives higher layer signaling including PSFCH setting information and resource pool setting information, but the present invention is not limited thereto. For example, at least one of the PSFCH setting information and the resource pool setting information may be configured in an application layer called Pre-configured, or may be configured in advance in a SIM. In this case, terminal 200 may use the information configured in advance without receiving the PSFCH setting information or the resource pool setting information. For example, terminal 200 may recognize slots available between base station 100 and terminal 200 and slots available for a side link based on the resource pool setting information configured in advance, and may use information on these slots in signal separation unit 202 and signal allocation unit 217.

[0101] [Operation of base station 100 and terminal 200] Next, an example of the operation of base station 100 (see FIG. 4) and terminal 200 (see FIG. 5) will be described.

[0102] FIG. 6 is a flowchart showing an example of processing by the terminal 200.

[0103] Terminal 200 that transmits and receives in the sidelink sets a setting value (e.g., a minimum number) of the number of SL symbols per slot (S101). For example, the setting value of the number of SL symbols per slot differs for each channel (e.g., PSCCH, PSSCH, PSFCH, or PSBCH).

[0104] Terminal 200 configures parameters related to the sidelink (S102). The parameters related to the sidelink may include, for example, configuration of an SL BWP, a resource pool, and a channel (including, for example, a PSFCH) to be allocated to each slot.

[0105] In this embodiment, the number of SL symbols set in terminal 200 based on parameters related to the side link is equal to or greater than the set value of the number of SL symbols. In other words, the number of SL symbols meets the set value. Terminal 200 recognizes that it is not instructed to transmit and receive channels using a number of SL symbols less than the set value. For example, when terminal 200 is instructed to transmit and receive a number of SL symbols less than the set value, it may assume that the instruction is an error.

[0106] The terminal 200 performs sidelink communication based on the set parameters (S103).

[0107] In addition, the setting value of the number of SL symbols per slot and parameters related to the side link (e.g., PSFCH setting information and resource pool setting information) may be pre-configured for terminal 200, for example, in a standard, may be pre-configured in an application layer called pre-configured, may be pre-configured in a SIM, or may be pre-configured in a higher layer such as an SIB called configured or other RRC.

[0108] Next, a setting value (eg, a minimum value) of the number of SL symbols per slot will be described.

[0109] For example, the setting values ​​Y1, Y2, Y3, and Y4 set for each channel or for each combination of channels may be set as follows: In addition, the following setting values ​​Y1, Y2, Y3, and Y4 may be set by combining two or more of them.

[0110] <Y1シンボル> When the number of SL symbols per slot is equal to or greater than Y1 symbols, terminal 200 can arrange PSCCH, PSSCH, and PSFCH in the slot.

[0111] <Y2シンボル> When the number of SL symbols per slot is Y2 symbols or more, terminal 200 can arrange PSCCH and PSSCH in the slot. Also, in the case of a combination of Y1 and Y2, when Y1>Y2 and Y1>SL symbols≧Y2, terminal 200 can arrange PSCCH and PSSCH in the slot as long as it does not arrange PSFCH.

[0112] <Y3シンボル> When the number of SL symbols per slot is Y3 symbols or more, terminal 200 can arrange PSFCH in the slot. Also, in the case of a combination of Y1 and Y3, when Y1>Y3 and Y1>number of SL symbols≧Y3, terminal 200 can arrange PSFCH in the slot as long as it does not arrange PSCCH and PSSCH.

[0113] <Y4シンボル> When the number of SL symbols per slot is equal to or greater than Y4 symbols, terminal 200 can place PSBCH in the slot.

[0114] An operation example 1 according to the present embodiment will be described below.

[0115] [Example 1] In the first operational example, Y1 and Y2 are set in the terminal 200.

[0116] Furthermore, the transmission timing of the PSFCH is set, for example, to a period of N. In other words, the PSFCH is arranged every N slots.

[0117] Furthermore, a channel (for example, at least one of PSCCH, PSSCH, and PSFCH) to be transmitted and received in each slot (in other words, a slot in a resource pool) available for the side link is configured in terminal 200.

[0118] In addition, the number of SL symbols in a slot available for sidelink is set in terminal 200 based on, for example, the setting of the channel transmitted and received in the slot. For example, the number of SL symbols in a slot in which PSCCH, PSSCH, and PSFCH are arranged is set to a number of symbols equal to or greater than Y1. Also, for example, the number of SL symbols in a slot in which PSCCH and PSSCH are arranged is set to a number of symbols equal to or greater than Y2.

[0119] In the operation example 1, PSCCH and PSSCH are also arranged in the slot where PSFCH is arranged. Also, in any slot where PSFCH is arranged, the number of SL symbols is set to a number of symbols equal to or greater than Y1. On the other hand, in any slot where PSFCH is not arranged, for example, PSCCH and PSSCH may be arranged. Also, in any slot where PSFCH is not arranged and PSCCH and PSSCH are arranged, the number of SL symbols is set to a number of symbols equal to or greater than Y2.

[0120] The timing of transmitting the PSFCH in response to the PSSCH received by terminal 200 (eg, how many slots after the slot in which the PSSCH is received that transmission is possible) may be determined in advance, for example.

[0121] FIG. 7 shows an example of a channel arrangement of a side link according to the first operation example.

[0122] In Fig. 7, the number of symbols of the PSFCH is 1. Furthermore, the PSFCH is placed after the SL symbol in the slot (for example, at the very end). Furthermore, in Fig. 7, Y1 = 6, Y2 = 4, and N = 4.

[0123] As shown in Fig. 7, PSCCH, PSSCH, and PSFCH are arranged in slot #0 and slot #4, which correspond to the transmission period of PSFCH. The number of SL symbols per slot in slot #0 and slot #4 is 11 symbols and 6 symbols, respectively. Therefore, in slot #0 and slot #4, the number of SL symbols is 6 symbols or more, and the condition of Y1 (= 6) or more is satisfied.

[0124] Also, as shown in FIG. 7, PSCCH and PSSCH are arranged in slot #2, which does not correspond to the transmission period of PSFCH. The number of SL symbols per slot in slot #2 is 5 symbols. Therefore, slot #2 does not satisfy the condition that the number of SL symbols is Y1 (=6) or more. However, slot #2 is not a slot in which PSFCH is arranged, and it satisfies the condition that the number of SL symbols is Y2 (=4) or more. In other words, terminal 200 can arrange PSCCH and PSSCH in slot #2 even if the condition that the number of SL symbols is Y1 or more is not satisfied.

[0125] In operation example 1, as shown in Fig. 7, a resource pool set in terminal 200 includes slots #0 and #4 in which PSCCH, PSSCH, and PSFCH are arranged, and slot #2 in which PSCCH and PSSCH are arranged (in other words, a slot in which PSFCH is not arranged). In operation example 1, channels according to the number of SL symbols are arranged in each slot in terminal 200. For example, a number of symbols equal to or greater than a set value (e.g., Y1 or Y2) corresponding to the set channel is set in each slot.

[0126] Also, in operation example 1, for example, the number of channels arranged in slots with the number of SL symbols equal to or greater than Y1 (three in operation example 1) is greater than the number of channels arranged in slots with the number of SL symbols less than Y1 (two in operation example 1). In other words, in operation example 1, in slots in the resource pool with a small number of SL symbols (for example, slots including a number of SL symbols less than Y1), PSFCH is not arranged, and PSCCH and PSSCH may be arranged. Also, in operation example 1, for example, in slots in the resource pool with a large number of SL symbols (for example, slots including a number of SL symbols equal to or greater than Y1), PSCCH, PSSCH, and PSFCH may be arranged.

[0127] With this channel arrangement of slots, even in slots with a small number of SL symbols, the number of symbols available for PSSCH can be secured by not allocating PSFCH, so that, for example, the transmission efficiency (for example, retransmission efficiency) of PSSCH can be improved.

[0128] In addition, in the operation example 1, for example, a setting related to PSFCH (for example, a transmission period N of PSFCH) and an SL symbol configuration for each slot (for example, the number of SL symbols) are set in terminal 200. In addition, in the operation example 1, a case where the number of SL symbols of a slot (for example, slots #0 and #4) in which the arrangements of PSCCH, PSSCH, and PSFCH are set does not satisfy Y1 (for example, the case is less than Y1) is not assumed. Similarly, a case where the number of SL symbols of a slot (for example, slot #2) in which the arrangements of PSCCH and PSSCH are set and the arrangement of PSFCH is not set does not satisfy Y2 (for example, the case is less than Y2) is not assumed.

[0129] Then, terminal 200 determines the arrangement of one or more channels in a slot based on information set in terminal 200 (e.g., information regarding the number of available SL symbols set in a slot, or information regarding channels to be arranged in a slot), and transmits the channels according to the determined channel arrangement.

[0130] In addition, terminal 200 may determine whether the setting of the SL symbols set for each channel is the expected setting based on the channel arrangement in each slot and the setting value of the number of SL symbols corresponding to the channels arranged in each slot.

[0131] For example, when terminal 200 determines that the setting of the SL symbol is an expected setting, terminal 200 may transmit and receive a side link based on the information set in terminal 200.

[0132] On the other hand, when terminal 200 determines that the setting of the SL symbols is not an expected setting, terminal 200 may determine that, for example, setting information related to the side link (for example, PSFCH setting information or resource pool setting information) has been erroneously received. For example, in the example shown in FIG. 7, when the number of SL symbols of the slots in which PSCCH, PSSCH, and PSFCH are arranged is less than Y1, or when the number of SL symbols of the slots in which PSCCH and PSSCH are arranged is less than Y2, terminal 200 may determine that the setting information related to the side link has been erroneously received. When terminal 200 determines that the setting information related to the side link has been erroneously received, terminal 200 may, for example, reacquire the setting information.

[0133] In this manner, in operation example 1, for example, parameters that satisfy a setting condition of a slot in which a PSFCH is arranged (for example, the relationship between the number of SL symbols and setting value Y1 or Y2) are set in terminal 200. With this parameter setting, terminal 200 only needs to operate according to the parameters set in terminal 200, and the operation in terminal 200 can be simplified.

[0134] In FIG. 7, an example has been described in which the PSFCH transmission cycle N=4 is taken as an example, and the PSFCH is arranged in slot number 4K (K is an integer), but the value of N is not limited to 4 and may be another value. For example, the value of N may be a multiple of 5. In the Uu link, for example, the cycle of a Synchronization Signal Block (SSB) is set to a multiple of 5 (for example, 5, 10, 20, 40, 80, 160). For example, when terminal 200 separates SSB monitoring in the Uu link and side link transmission and reception in slot units, setting the cycle N of the PSFCH to a multiple of 5 makes it easier to support processing of both links (for example, transmission and reception).

[0135] Furthermore, the setting of the transmission timing of the PSFCH is not limited to the transmission cycle N, and may be based on the shift amount L. For example, when the shift amount L is set, the PSFCH is placed in slot number 4K+L (K is an integer). For example, the shift amount L is an integer smaller than N, and may be expressed as L=(0, 1, ..N-1).

[0136] (Embodiment 2) A base station and a terminal according to the present embodiment have a basic configuration in common with base station 100 and terminal 200 according to the first embodiment.

[0137] In this embodiment, terminal 200 determines the arrangement of one or more channels in a slot based on the number of SL symbols available in the slot, and transmits the channels according to the determined channel arrangement.

[0138] For example, when the number of SL symbols is large in a slot in which multiple channels such as PSCCH, PSSCH, and PSFCH are set (for example, a slot in which the number of SL symbols is Y1 or more), terminal 200 places PSCCH, PSSCH, and PSFCH in the slot. On the other hand, when the number of SL symbols is small in a slot in which multiple channels are set (for example, a slot in which the number of SL symbols is less than Y1), terminal 200 places PSCCH and PSSCH without placing PSFCH, for example.

[0139] In other words, when the condition (e.g., Y1 or more) of the number of SL symbols for transmitting PSFCH (in other words, three channels of PSCCH, PSSCH, and PSFCH) is not satisfied even in a slot with a PSFCH transmission period N, terminal 200 does not allocate PSFCH, but allocates PSCCH and PSSCH. Also, in this case, for example, terminal 200 may allocate a signal of PSCCH or PSSCH to a resource set for PSFCH.

[0140] This channel arrangement of slots allows terminal 200 to transmit and receive other channels of the side link (e.g., PSCCH or PSSCH) even in a slot where the number of symbols for transmitting the PSFCH is insufficient in the transmission cycle N of the PSFCH. For example, even if the transmission cycle N of the PSFCH and the cycle of slots available for the side link are unlikely to match, terminal 200 can perform transmission and reception of the side link. Thus, according to the present embodiment, it is possible to improve the transmission efficiency of side link communication.

[0141] Hereinafter, operation examples (for example, operation example 2 and operation example 3) according to this embodiment will be described.

[0142] [Example 2] In the second operation example, Y1 and Y2 are set in the terminal 200.

[0143] Furthermore, the transmission timing of the PSFCH is set, for example, to a period of N. In other words, the PSFCH is arranged every N slots.

[0144] In addition, in the second operation example, a condition is set that the number of SL symbols is Y1 symbols or more in slots in which the PSCCH, PSSCH, and PSFCH are arranged, as in the first operation example. Also, in slots in which the PSFCH is not arranged and the PSCCH and PSSCH are arranged, a condition is set that the number of SL symbols is Y2 symbols or more.

[0145] However, in the operation example 2, unlike the operation example 1, it is permitted that the condition that the number of SL symbols is Y1 symbols or more is not satisfied in a slot of the transmission cycle N of the PSFCH. In other words, in the operation example 2, SL symbols less than Y1 symbols can be set in a slot of the transmission cycle N of the PSFCH.

[0146] In a slot in which a PSFCH is to be arranged, if the condition that the number of SL symbols is Y1 symbols or more is not satisfied, terminal 200 may arrange PSCCH and PSSCH without arranging a PSFCH, for example, if the condition that the number of SL symbols is Y2 symbols or more is satisfied. Note that, if the condition that the number of SL symbols is Y2 symbols or more is not satisfied, terminal 200 may not arrange, for example, a PSFCH, a PSCCH, and a PSSCH, or may arrange channels corresponding to other conditions (for example, a condition corresponding to setting values ​​different from Y1 and Y2).

[0147] FIG. 8 illustrates an example of a channel arrangement of a side link according to the second operation example.

[0148] In Fig. 8, the number of symbols of the PSFCH is set to 1. Furthermore, the PSFCH is placed after the SL symbol in the slot (for example, at the very end). Furthermore, in Fig. 8, Y1=6, Y2=4, and N=2.

[0149] As shown in Fig. 8, the number of SL symbols per slot in slots #0, #4, and #6 corresponding to the transmission period of the PSFCH is 11 symbols, 6 symbols, and 6 symbols, respectively. Therefore, in slots #0, #4, and #6, the number of SL symbols is 6 symbols or more, which satisfies the condition that Y1 (=6) or more, and therefore PSCCH, PSSCH, and PSFCH are arranged.

[0150] On the other hand, as shown in Fig. 8, the number of SL symbols per slot in slot #2 corresponding to the transmission period of PSFCH is 5. Therefore, in slot #2, the number of SL symbols does not satisfy the condition of Y1 (= 6) or more, but satisfies the condition of Y2 (= 4) or more, so PSFCH is not arranged, and PSCCH and PSSCH may be arranged.

[0151] 8, the number of SL symbols per slot in slot #3, which does not fall within the transmission period of the PSFCH, is 14. Therefore, in slot #3, the number of SL symbols satisfies the condition that it is Y2 (=4) or more, and therefore PSCCH and PSSCH are allocated.

[0152] In operation example 2, for example, a setting related to PSFCH (for example, a transmission period N of PSFCH) and an SL symbol configuration for each slot (for example, the number of SL symbols) are set in terminal 200. Also, in operation example 2, for example, the number of SL symbols in a slot (for example, slot #2 in FIG. 8) in which the arrangement of PSCCH, PSSCH, and PSFCH is set may be less than Y1 symbols. Even if the number of SL symbols in a slot is less than Y1, terminal 200 assumes the arrangement of PSCCH and PSSCH when the condition of Y2 or more is satisfied (for example, Y1>number of SL symbols≧Y2).

[0153] In other words, when the number of SL symbols is Y1 or more, terminal 200 arranges PSCCH, PSSCH, and PSFCH in the slot, and when the number of SL symbols is less than Y1, arranges some channels (e.g., PSCCH and PSSCH) among PSCCH, PSSCH, and PSFCH, and does not arrange the remaining channels (e.g., PSFCH). In addition, when arranging PSCCH and PSSCH, resources reserved for PSFCH may be allocated to PSCCH or PSSCH, for example.

[0154] Due to this channel arrangement of slots, in operation example 2, even if there is a slot in which the number of SL symbols is less than Y1 among the slots of the transmission cycle N of the PSFCH, terminal 200 can transmit and receive the PSCCH and PSSCH by skipping the transmission of the PSFCH in that slot.

[0155] In addition, for example, the following method may be applied to processing of a feedback signal (for example, ACK / NACK information) to be transmitted by the PSFCH whose transmission has been skipped.

[0156] (1) Terminal 200 may, for example, cancel (in other words, drop) the transmission of PSFCH (for example, ACK / NACK information). In addition, for example, another terminal 200 that has transmitted a PSSCH (for example, a data signal) corresponding to the PSFCH may assign a signal that does not transmit or receive a feedback signal when the other terminal 200 can recognize the dropping of the PSFCH in the terminal receiving the PSSCH.

[0157] (2) Terminal 200 may transmit the PSFCH, for example, in a side link slot next to the slot in which the transmission of the PSFCH was skipped. For example, in FIG. 8, terminal 200 may transmit the PSFCH in slot #3 next to slot #2 in which the transmission of the PSFCH was skipped. This transmission of the PSFCH can reduce the amount of delay of the feedback signal. Note that the slot in which the PSFCH is transmitted is not limited to the slot next to the slot in which the transmission of the PSFCH was skipped, and may be two or more slots later.

[0158] (3) Terminal 200 may transmit the PSFCH, for example, at the transmission timing of the PSFCH next to the slot in which the transmission of the PSFCH was skipped (for example, after N slots or L slots). For example, in FIG. 8, terminal 200 may transmit the PSFCH in slot #4, which is the transmission timing of the PSFCH next to slot #2.

[0159] (4) For example, when a PSFCH for transmitting other ACK / NACK information is placed in a sidelink slot next to a slot in which PSFCH transmission has been skipped or in a slot having the transmission timing of the next PSFCH, terminal 200 may bundle and transmit the ACK / NACK information in the PSFCH. Here, "bundling" refers to a method of setting a NACK if at least one of multiple pieces of ACK / NACK information is a NACK, and setting an ACK if all of the information is an ACK.

[0160] (5) When a PSFCH for transmitting other ACK / .NACK information is arranged in a sidelink slot next to a slot in which a PSFCH transmission has been skipped or in a slot having the transmission timing of the next PSFCH, terminal 200 may multiplex and transmit the ACK / NACK information. Note that when the ACK / NACK information is multiplexed and transmitted, the amount of information increases, so terminal 200 may transmit the ACK / NACK information in, for example, a plurality of sequences or resources.

[0161] [Example 3] In the operation example 1 (eg, FIG. 7) and the operation example 2 (eg, FIG. 8), the example in which the PSFCH is arranged in the last symbol in the slot of the resource pool for sidelink has been described, but the present invention is not limited thereto.

[0162] For example, as shown in Fig. 9, the PSFCH may be arranged in a plurality of symbols in a slot of a resource pool for sidelink. In Fig. 9, the PSFCH is arranged in six symbols in the slot. In other words, the channel format shown in Fig. 9 is a format in which the PSFCH is arranged in six symbols and the PSCCH is arranged in two symbols.

[0163] Furthermore, the set values ​​of Y1 and Y2 may differ depending on, for example, the format of the PSFCH. For example, in a format in which the PSFCH is arranged in the last symbol in a slot, as in operation example 1 (FIG. 7) or operation example 2 (FIG. 8), Y1=6 and Y2=4 are set. In contrast, in a format in which the PSFCH is arranged in multiple symbols (for example, six symbols) in a slot, as shown in FIG. 9, Y1=8 and Y2=5 may be set. For example, in FIG. 9, when the number of SL symbols in a slot is Y1=8 or more, terminal 200 can transmit the PSCCH (2 symbols) and the PSFCH (6 symbols) without overlapping in the time domain.

[0164] For example, as shown in Fig. 9, in slots #0 and #4 corresponding to the transmission period of the PSFCH, the number of SL symbols = 11 symbols and 8 symbols are Y1 or more, so terminal 200 arranges PSCCH, PSSCH, and PSFCH. On the other hand, as shown in Fig. 9, in slot #2 corresponding to the transmission period of the PSFCH, the number of SL symbols = 5 symbols is less than Y1 and greater than or equal to Y2, so terminal 200 does not arrange PSFCH, but arranges PSCCH and PSSCH.

[0165] In addition, in the format shown in FIG. 9, for example, the values ​​of both Y1 and Y2 are different from Y1 and Y2 in the formats shown in FIG. 7 and FIG. 8, respectively. However, this is not limited to this, and for example, the value of Y2 may be set to the same value regardless of the format of the PSFCH.

[0166] Also, in FIG. 9, as an example, PSFCH and PSSCH are arranged in the same symbol, but PSFCH and PSCCH are not arranged in the same symbol. This arrangement can ensure the transmission power of PSCCH. Both PSCCH and PSFCH are control signals, and for example, transmission power can be allocated with priority over PSSCH. If PSCCH and PSFCH are arranged in the same symbol, for example, the transmission power of PSCCH will decrease, so PSCCH and PSFCH are not arranged in the same symbol. Note that, for example, when a decrease in the transmission power of PSCCH is unlikely to affect transmission, PSCCH and PSFCH may be arranged in the same symbol.

[0167] Operational examples 2 and 3 have been described above.

[0168] (Embodiment 3) A base station and a terminal according to the present embodiment have a basic configuration in common with base station 100 and terminal 200 according to the first embodiment.

[0169] In this embodiment, terminal 200 determines the arrangement of one or more channels in a slot based on the number of SL symbols available in the slot, and transmits the channels according to the determined channel arrangement.

[0170] For example, when the number of SL symbols is large in a slot in which multiple channels such as PSCCH, PSSCH, and PSFCH are set (for example, a slot in which the number of SL symbols is Y1 or more), terminal 200 places PSCCH, PSSCH, and PSFCH in the slot. On the other hand, when the number of SL symbols is small in a slot in which multiple channels are set (for example, a slot in which the number of SL symbols is less than Y1), terminal 200 places, for example, PSFCH.

[0171] Due to this channel arrangement in the slot, for example, even in a slot where the number of SL symbols for transmitting a plurality of channels is insufficient, terminal 200 can transmit a PSFCH signal, so that the slot can be used effectively. Therefore, according to the present embodiment, it is possible to improve the transmission efficiency of sidelink communication.

[0172] Hereinafter, an operation example 4 according to the present embodiment will be described.

[0173] [Example 4] In the fourth operation example, Y1 and Y3 are set in the terminal 200.

[0174] Furthermore, the transmission timing of the PSFCH is set, for example, to a period of N. In other words, the PSFCH is arranged every N slots.

[0175] In addition, in the operation example 4, a condition is set that the number of SL symbols is Y1 symbols or more in slots in which PSCCH, PSSCH, and PSFCH are arranged, as in the operation example 1. Also, a condition is set that the number of SL symbols is Y3 symbols or more in slots in which PSCCH and PSSCH are not arranged and PSFCH is arranged.

[0176] However, in operation example 4, unlike operation example 1, it is permitted that the condition that the number of SL symbols is Y1 symbols or more or the condition that the number of SL symbols is Y3 symbols or more is not satisfied in a slot of a PSFCH transmission cycle N. In other words, in operation example 4, SL symbols less than Y1 symbols or less than Y3 symbols may be set in a slot of a PSFCH transmission cycle N.

[0177] If the condition that the number of SL symbols is Y1 symbols or more is not met in a slot in which the PSFCH is to be placed, terminal 200 may place the PSFCH without placing the PSCCH and the PSSCH, for example, if the condition that the number of SL symbols is Y3 symbols or more is met.

[0178] FIG. 10 shows an example of a channel arrangement of a side link according to the fourth operation example.

[0179] In Fig. 10, the number of symbols of the PSFCH is 1. The PSFCH is placed after the SL symbol in the slot (for example, at the very end). In Fig. 10, Y1 = 6, Y3 = 2, and N = 2. In operation example 4, as an example, Y3 is set assuming a total of two symbols, one symbol for transmitting the PSFCH and one symbol corresponding to the processing time of automatic gain control (AGC) before transmitting the PSFCH.

[0180] As shown in Fig. 10, the number of SL symbols per slot in slots #0 and #4 corresponding to the transmission period of the PSFCH is 11 and 6, respectively. Therefore, in slots #0 and #4, the number of SL symbols is 6 or more, which satisfies the condition that Y1 (=6) or more, and therefore the PSCCH, PSSCH, and PSFCH are arranged.

[0181] On the other hand, as shown in Fig. 10, the number of SL symbols per slot in slot #2 corresponding to the transmission period of PSFCH is 2. Therefore, in slot #2, the number of SL symbols does not satisfy the condition of Y1 (= 6) or more, but satisfies the condition of Y3 (= 2) or more, so PSCCH and PSSCH are not arranged, and PSFCH is arranged.

[0182] 10, the number of SL symbols per slot in slot #3, which does not fall within the transmission period of the PSFCH, is 4. Therefore, in slot #3, the number of SL symbols satisfies the condition that it is Y2 (=4) or more, and therefore PSCCH and PSSCH are arranged.

[0183] In operation example 4, for example, a setting related to PSFCH (for example, a transmission period N of PSFCH) and an SL symbol configuration for each slot (for example, the number of SL symbols) are set in terminal 200. Also, in operation example 4, for example, the number of SL symbols in a slot (for example, slot #2 in FIG. 10) in which the arrangement of PSCCH, PSSCH, and PSFCH is set may be less than Y1 symbols. Terminal 200 assumes the arrangement of PSFCH when the condition of Y3 or more is satisfied (for example, Y1>number of SL symbols≧Y3) even if the number of SL symbols in a slot is less than Y1.

[0184] In other words, when the number of SL symbols is Y1 or more, terminal 200 places PSCCH, PSSCH, and PSFCH in the slot, and when the number of SL symbols is less than Y1, terminal 200 places some of the channels (e.g., PSFCH) among PSCCH, PSSCH, and PSFCH, and does not place the remaining channels (e.g., PSCCH and PSSCH).

[0185] Due to this channel arrangement of slots, in operation example 4, even if there is a slot in which the number of SL symbols is less than Y1 among the slots of the transmission cycle N of the PSFCH, terminal 200 can transmit and receive the PSFCH by not allocating PSCCH and PSSCH in that slot. Therefore, according to operation example 4, it is possible to reduce the delay of the feedback signal. In other words, in operation example 4, even in a slot with a small number of SL symbols (for example, a slot in which the number of SL symbols is less than Y1 and PSCCH and PSSCH cannot be transmitted), terminal 200 can transmit PSFCH (for example, 1 symbol), and therefore the slot can be used effectively.

[0186] In the present embodiment, a case has been described in which a slot in which PSFCH is arranged without arranging PSCCH and PSSCH is determined from the values ​​of Y1, Y3, and N. However, the present invention is not limited to this, and for example, a slot in which PSFCH is arranged without arranging PSCCH and PSSCH may be set in advance. In this slot, for example, the arrangement of PSCCH and PSSCH is not set, and the arrangement of PSFCH is set. In a slot in which PSFCH is arranged, terminal 200 does not need to monitor PSCCH and PSSCH, for example, and can reduce power consumption without performing an operation called "sensing" to detect whether or not another terminal is transmitting a signal.

[0187] (Embodiment 4) A base station and a terminal according to the present embodiment have a basic configuration in common with base station 100 and terminal 200 according to the first embodiment.

[0188] In this embodiment, terminal 200 determines the arrangement of one or more channels in a slot based on the number of SL symbols available in the slot, and transmits the channels according to the determined channel arrangement.

[0189] For example, when the number of SL symbols is large in a slot in which multiple channels such as PSCCH, PSSCH, and PSFCH are set (for example, a slot in which the number of SL symbols is Y1 or more), terminal 200 allocates PSCCH, PSSCH, and PSFCH in the slot.

[0190] On the other hand, when the number of SL symbols is small in a slot in which multiple channels are set (for example, a slot in which the number of SL symbols is less than Y1), terminal 200 may arrange some of the multiple channels in the slot and not arrange the remaining channels. The some channels may be, for example, any one of PSSCH (for example, a channel for transmitting a data signal) and PSCCH (for example, a channel for transmitting allocation information of a data signal). Alternatively, the some channels may be, for example, any one of PSSCH and PSCCH, and PSFCH.

[0191] Due to this channel arrangement in the slot, for example, even in a slot where the number of SL symbols for transmitting a plurality of channels is insufficient, terminal 200 can transmit a PSCCH or PSSCH signal, so that the slot can be used effectively. Therefore, according to the present embodiment, the transmission efficiency of sidelink communication can be improved.

[0192] Hereinafter, operation examples (operation example 5 and operation example 6) according to this embodiment will be described.

[0193] [Example 5] In the fifth operational example, Y1, Y5, and Y6 are set in the terminal 200.

[0194] <Y5シンボル> When the number of SL symbols per slot is Y5 symbols or more, terminal 200 can arrange PSSCH in the slot. Also, when using a combination of Y1 and Y5, if Y1>Y5 and Y1>SL symbols≧Y5, terminal 200 cannot arrange PSCCH in the slot, but can arrange PSSCH.

[0195] <Y6シンボル> In a slot in which the PSFCH is arranged, if the number of SL symbols per slot is Y6 symbols or more, terminal 200 can arrange the PSSCH and PSFCH in the slot. Also, when using a combination of Y1 and Y6, if Y1>Y6 and Y1>SL symbols≧Y6, terminal 200 cannot arrange the PSCCH in the slot, but can arrange the PSSCH and PSFCH.

[0196] For example, in the operation example 5, as in the operation example 1, a condition is set that the number of SL symbols is Y1 symbols or more in slots in which PSCCH, PSSCH, and PSFCH are arranged. Also, a condition is set that the number of SL symbols is Y5 symbols or more in slots in which PSCCH is not arranged and PSSCH is arranged. Also, a condition is set that the number of SL symbols is Y6 symbols or more in slots in which PSCCH is not arranged and PSSCH and PSFCH are arranged.

[0197] FIG. 11 shows an example of a channel arrangement of a side link according to the fifth operation example.

[0198] In Fig. 11, the number of symbols of the PSFCH is 1. The PSFCH is placed after the SL symbol in the slot (for example, at the very end). In Fig. 11, Y1 = 8, Y5 = 4, Y6 = 6, and the transmission period of the PSFCH is N = 2.

[0199] 11, the number of SL symbols per slot in slot #0 corresponding to the transmission period of PSFCH is 11. Therefore, in slot #0, the number of SL symbols satisfies the condition that it is Y1 (=8) or more, and therefore PSCCH, PSSCH, and PSFCH are arranged.

[0200] 11, the number of SL symbols per slot in slot #1, which does not fall within the transmission period of the PSFCH, is 4. Therefore, in slot #1, the number of SL symbols does not satisfy the condition of Y1 (=8) or more, but does satisfy the condition of Y5 (=4) or more, so that the PSSCH is placed therein.

[0201] 11, the number of SL symbols per slot in slot #2 corresponding to the transmission period of the PSFCH is 6. Therefore, in slot #2, the number of SL symbols does not satisfy the condition of Y1 (=8) or more, but satisfies the condition of Y6 (=6) or more, so PSSCH and PSFCH are arranged.

[0202] When a PSSCH is arranged without a PSCCH, as in slots #1 and #2 shown in FIG. 11, terminal 200 transmits an SCI (in other words, a PSCCH) instructing reception of the PSSCH in a forward slot. For example, in FIG. 11, the SCI transmitted in the PSCCH in slot #0 instructs reception of the PSSCH in slots #0, #1, and #2. For example, terminal 200 may indicate the number of consecutive slots or the slot number to be assigned by the SCI. For example, in FIG. 11, the method in which terminal 200 transmits Transport Blocks of the same HARQ process ID in slots #0, #1, and #2 is also called "repetition" or "blind repetition".

[0203] In FIG. 11, both Y5 and Y6 are set for terminal 200, but either Y5 or Y6 may be set.

[0204] [Example 6] In the sixth operational example, Y1, Y7, and Y8 are set in the terminal 200.

[0205] <Y7シンボル> When the number of SL symbols per slot is Y7 symbols or more, terminal 200 can arrange PSCCH in the slot. Also, when using a combination of Y1 and Y7, if Y1>Y7 and Y1>SL symbols≧Y7, terminal 200 cannot arrange PSSCH in the slot, but can arrange PSCCH.

[0206] <Y8シンボル> In a slot in which the PSFCH is arranged, if the number of SL symbols per slot is Y8 symbols or more, terminal 200 can arrange the PSCCH and PSFCH in the slot. Also, when using a combination of Y1 and Y8, if Y1>Y8 and Y1>SL symbols≧Y8, terminal 200 cannot arrange the PSSCH in the slot, but can arrange the PSCCH and PSFCH.

[0207] For example, in the sixth operational example, as in the first operational example, a condition is set that the number of SL symbols is Y1 or more in slots in which PSCCH, PSSCH, and PSFCH are arranged. Also, a condition is set that the number of SL symbols is Y2 or more in slots in which PSFCH is not arranged and PSCCH and PSSCH are arranged. Also, a condition is set that the number of SL symbols is Y7 or more in slots in which PSSCH is not arranged and PSCCH is arranged. Also, a condition is set that the number of SL symbols is Y8 or more in slots in which PSSCH is not arranged and PSCCH and PSFCH are arranged.

[0208] FIG. 12 shows an example of a channel arrangement of a side link according to the sixth operation example.

[0209] In Fig. 12, the number of symbols of the PSFCH is 1. The PSFCH is placed after the SL symbol in the slot (for example, at the very end). In Fig. 12, Y1 = 8, Y2 = 6, Y7 = 3, Y8 = 5, and the transmission period of the PSFCH is N = 2.

[0210] Slot #0 shown in Fig. 12(a) is, for example, a slot that does not correspond to the transmission period of the PSFCH, and the number of SL symbols in slot #0 is 3 symbols. Therefore, in slot #0, the number of SL symbols does not satisfy the condition of Y2 (=6) symbols or more, but satisfies the condition of Y7 (=3) symbols or more, and therefore a PSCCH is arranged therein. The PSCCH arranged in slot #0 may include, for example, an SCI that instructs reception of a PSSCH arranged in a slot after slot #0 (slot #1 in Fig. 12(a)), and may include a control signal (for example, a group common SCI) received by multiple terminals 200.

[0211] 12(a) is, for example, a slot that corresponds to the transmission period of the PSFCH, and the number of SL symbols in slot #1 is 11. Therefore, in slot #1, the number of SL symbols satisfies the condition that it is Y1 or more, and therefore, PSCCH, PSSCH, and PSFCH are arranged.

[0212] Also, slot #0 shown in FIG. 12(b) is, for example, a slot corresponding to the transmission period of the PSFCH, and the number of SL symbols in slot #0 is 5 symbols. Therefore, in slot #0, the number of SL symbols does not satisfy the condition of Y1 (=8) symbols or more, but satisfies the condition of Y8 (=5) symbols or more, so PSCCH and PSFCH are arranged. As in FIG. 12(a), the PSCCH arranged in slot #0 may include an SCI instructing reception of the PSSCH arranged in a slot after slot #0 (slot #1 in FIG. 12(b)), and may include a control signal (for example, a group common SCI) received by multiple terminals 200.

[0213] 12(b), for example, slot #1 is a slot that does not correspond to the transmission period of the PSFCH, and the number of SL symbols in slot #1 is 11. Therefore, in slot #1, the number of SL symbols satisfies the condition that it is Y2 (=6) or more, and therefore PSCCH and PSSCH are arranged.

[0214] As shown in Figures 12(a) and 12(b), terminal 200 may instruct reception of the PSSCH in slot #1 by the SCI transmitted in the PSCCH in slot #0 and the SCI transmitted in the PSCCH in slot #1. For example, by transmitting information including overlapping content between the SCI in slot #0 and the SCI in slot #1, it is possible to improve the reception quality of the SCI in destination terminal 200. Also, by transmitting SCI in multiple slots as shown in Figures 12(a) and 12(b), for example, the probability that other terminals will detect (in other words, sense) the SCI and avoid transmission collisions is improved.

[0215] In addition, in FIG. 12, both Y7 and Y8 are set for terminal 200, but either one of Y7 and Y8 may be set.

[0216] The embodiments of the present disclosure have been described above.

[0217] (Other embodiments) (1) Terminals that transmit and receive in the sidelink may include, for example, terminals that perform transmission processing but do not perform reception processing, terminals that perform reception processing but do not perform transmission processing, or terminals that perform both transmission and reception.

[0218] (2) A slot in which a channel such as PSCCH, PSSCH, PSFCH, or PSBCH is arranged is, for example, a slot in which these channels can be transmitted and received. However, the slot in which a channel such as PSCCH, PSSCH, PSFCH, or PSBCH is arranged may include a slot in which no signal is transmitted or received, for example, due to the determination of terminal 200 or resource allocation.

[0219] (3) As an example of the arrangement of PSCCH and PSSCH, for example, as shown in Fig. 1, an example in which PSCCH is arranged in the first few symbols of PSSCH has been described, but the arrangement of PSCCH and PSSCH is not limited to the arrangement shown in Fig. 1. For example, the above embodiment can also be applied to an arrangement in which PSCCH and PSSCH are time-multiplexed (TDM: Time Division Multiplexing) or FDM-multiplexed.

[0220] (4) The number of symbols allocated to a PSSCH may be, for example, allocated by the corresponding PSCCH or may be set in advance when configuring a resource pool.

[0221] For example, when the number of symbols of PSSCH is not assigned by PSCCH but is a value assigned semi-statically, the condition that "the number of SL symbols is Y2 or more" applied to the arrangement of PSCCH and PSSCH in each of the above embodiments may be replaced with the condition that "the number of SL symbols is equal to or greater than the number of symbols of PSSCH".

[0222] In addition, the condition that "the number of SL symbols is Y1 or more" applied to the arrangement of PSCCH, PSSCH, and PSFCH in each of the above embodiments may be replaced with the condition that "the number of SL symbols is greater than or equal to the number of PSSCH symbols plus the number of transmission symbols of PSFCH (e.g., 2 or 3 symbols)".

[0223] The number of symbols of the PSSCH, the number of symbols of the PSCCH, or the number of symbols of the PSFCH may include symbols for AGC set before or after the channel.

[0224] (5) When settings regarding the side link are preconfigured in terminal 200, the settings regarding the side link may be set, for example, in a specification (e.g., a standard), may be set in an application layer called pre-configured, may be set in a SIM provided in terminal 200, may be set in a higher layer such as an SIB called configured or other RRC, or may be set in medium access control (MAC).

[0225] (6) At least one of the values ​​of Y1 to Y8 may be variably set depending on, for example, the size of the frequency domain of the resource pool or the sidelink BWP. For example, the larger the size of the frequency domain, the smaller the value of Y1 to Y8 may be set. Since the amount of resources per symbol increases as the size of the frequency domain increases, the TBS can be set to a larger size even if the value set for at least one of Y1 to Y8 is set to a small value. Also, when the size of the frequency domain is large (for example, when it is equal to or larger than a threshold), at least one of the values ​​of Y1 to Y8 may not be set. In other words, when the size of the frequency domain is large (for example, when it is equal to or larger than a threshold), at least one of the values ​​of Y1 to Y8 may be set to 0.

[0226] (7) At least one of the values ​​of Y1 to Y8 may be set to a value including the number of symbols for AGC arranged in the symbols before or after the channel, or may be set to a value not including the number of symbols for AGC. Also, for example, when at least one of the values ​​of Y1 to Y8 is set to a value not including the number of symbols for AGC, terminal 200 may determine whether or not the channel can be arranged in a slot (in other words, whether or not the signal of the channel can be transmitted) based on the value obtained by adding the number of symbols for AGC to the value of Y1 to Y8.

[0227] (8) Y symbols or more (Y is, for example, any one of Y1 to Y8) may be replaced with more than Y symbols. In other words, less than Y symbols may be replaced with Y symbols or less.

[0228] (9) In the operational examples 1 to 6, consecutive slots have been described, but the slots do not have to be consecutive in time.

[0229] (10) The format of the PSFCH is not limited to the format shown in FIG. 1, for example, and may be another format.

[0230] (11) The number of symbols of the PSCCH is not limited to 2 symbols, and may be 1 symbol, or may be 3 to 14 symbols. The number of symbols of the PSFCH is not limited to 1 symbol, 2 symbols, or 6 symbols, and may be other numbers of symbols. The number of symbols of the PSSCH is not limited to the above examples, and may be other numbers of symbols.

[0231] (12) An embodiment of the present disclosure may be applied not only to sidelink communication (in other words, direct communication between a plurality of terminals) but also to Uu link communication (in other words, communication between base station 100 and terminal 200). For example, an embodiment of the present disclosure may be applied when the number of symbols is limited in Uu link communication. In this case, for example, the channel arrangement in the sidelink described in each of the above embodiments may be replaced with the channel arrangement in the Uu link. For example, the PSCCH may be replaced with a downlink data channel (PDCCH: Physical Downlink Control Channel), the PSSCH may be replaced with a downlink data channel (PDSCH: Physical Downlink Shared Channel) or an uplink data channel (PUSCH: Physical Uplink Shared Channel), the PSFCH may be replaced with an uplink control channel (PUCCH: Physical Uplink Control Channel), and the PSBCH may be replaced with a broadcast channel (PBCH: Physical Broadcast Channel).

[0232] (13) In the case of Mode 1, terminal 200 may dynamically receive a setting of the number of SL symbols per slot in a control signal such as a PDCCH via the Uu link from base station 100. Terminal 200 can dynamically and variably set the number of SL symbols.

[0233] (14) In the above embodiments, as an example, the case where the number of symbols that can be allocated to a channel is set for any one or a combination of PSCCH, PSSCH, PSFCH, and PSBCH has been described. However, the channel to which an embodiment of the present disclosure is applied may be another signal or channel.

[0234] For example, an embodiment of the present disclosure can be applied to signals such as a Demodulation Reference signal (DMRS), a Sounding Reference signal (SRS), a signal for a scheduling request (SRI: Scheduling Request Indication), a random access channel (PRACH: Physical Random Access channel), a signal for synchronization such as a Primary Synchronization Signal (PSS), or a Secondary Synchronization Signal (SSS).

[0235] For example, when DMRS is applied, a setting value of the number of symbols for determining channel allocation in a sidelink slot (e.g., equivalent to Y1 to Y8) may be set depending on the setting of the number of symbols for DMRS or the presence or absence of Additional DMRS.

[0236] (15) In the above embodiments, the DL symbol (e.g., represented as "D") in the Uu link between the base station 100 and the terminal is not used for sidelink communication. However, the DL symbol in the Uu link may be used for sidelink communication. For example, when the effect of interference due to the sidelink on DL in the Uu link between the base station 100 and the terminal 200 can be ignored (e.g., when the effect of interference is not large), the DL symbol between the base station 100 and the terminal 200 may also be used for sidelink communication. In this case, the above embodiments may be applied based on the number of SL symbols including the DL symbol of the Uu link.

[0237] (16) The operation examples of the above-mentioned embodiments may be used in combination. For example, the setting value of the number of symbols set in terminal 200 (for example, at least one or a combination of Y1 to Y8 described above) may be determined according to the setting of the channel arrangement in one slot (in other words, the channel or combination of channels arranged in the slot).

[0238] (17) The unit of time resource is not limited to a combination of slots and symbols, but may be, for example, a time resource unit such as a frame, a subframe, a slot, a subslot, or a symbol, or may be another time resource unit. Also, for example, the number of symbols included in one slot is not limited to 14 symbols, but may be another number of symbols.

[0239] The present disclosure can be realized by software, hardware, or software linked to hardware. Each functional block used in the description of the above embodiment may be realized partially or entirely as an LSI, which is an integrated circuit, and each process described in the above embodiment may be controlled partially or entirely by one LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of one chip to include some or all of the functional blocks. The LSI may have input and output data. Depending on the degree of integration, the LSI may be called an IC, a system LSI, a super LSI, or an ultra LSI. The method of integration is not limited to LSI, and may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. In addition, a field programmable gate array (FPGA) that can be programmed after LSI manufacture, or a reconfigurable processor that can reconfigure the connections and settings of circuit cells inside the LSI may be used. The present disclosure may be realized as digital processing or analog processing. Furthermore, if a new integrated circuit technology that can replace LSI appears due to the progress of semiconductor technology or a derivative technology, it is possible to integrate the functional blocks using that technology. The application of biotechnology is also a possibility.

[0240] The present disclosure may be implemented in any type of apparatus, device, or system having a communication function (collectively referred to as a communication apparatus). The communication apparatus may include a radio transceiver and processing / control circuitry. The radio transceiver may include a receiver and a transmitter, or both as functions. The radio transceiver (transmitter and receiver) may include a radio frequency (RF) module and one or more antennas. The RF module may include an amplifier, an RF modulator / demodulator, or the like. Non-limiting examples of communication devices include telephones (e.g., cell phones, smartphones, etc.), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks, etc.), cameras (e.g., digital still / video cameras), digital players (e.g., digital audio / video players), wearable devices (e.g., wearable cameras, smart watches, tracking devices, etc.), game consoles, digital book readers, telehealth and telemedicine devices, communication-enabled vehicles or mobile conveyances (e.g., cars, airplanes, boats, etc.), and combinations of the above devices.

[0241] Communications Equipment includes, but is not limited to portable or mobile equipment, non-portable or fixed equipment, devices and systems of any kind, such as smart home devices (appliances, lighting equipment, smart meters or metering devices, control panels, etc.), vending machines and any other "Things" that may exist on an Internet of Things (IoT) network.

[0242] Communications include data communications via cellular systems, wireless LAN systems, communications satellite systems, etc., as well as data communications via combinations of these.

[0243] A communications apparatus also includes devices, such as controllers and sensors, connected or coupled to a communications device that performs the communications functions described in this disclosure, such as controllers and sensors that generate control and data signals used by the communications device to perform the communications functions of the communications apparatus.

[0244] The communication apparatus also includes infrastructure facilities, such as base stations, access points, and any other apparatus, device, or system that communicates with or controls the various apparatuses listed above, but are not limited to these.

[0245] A terminal according to one embodiment of the present disclosure includes a circuit for determining an arrangement of one or more channels in a time interval based on information regarding the number of symbols available in the time interval, and a transmitter for transmitting the channels according to the arrangement.

[0246] In one embodiment of the present disclosure, the number of channels arranged in the time interval in which the number of symbols is equal to or greater than the threshold is greater than the number of channels arranged in the time interval in which the number of symbols is less than the threshold.

[0247] In one embodiment of the present disclosure, the threshold is set according to at least one of a type of channel and a combination of channels allocated to the time interval.

[0248] In one embodiment of the present disclosure, the number of symbols equal to or greater than a threshold is set in the time interval in which a channel for transmitting a response signal to a data signal is allocated.

[0249] In one embodiment of the present disclosure, in a time interval in which multiple channels are set, if the number of symbols is equal to or greater than a first threshold, the multiple channels are placed in the time interval, and if the number of symbols is less than the first threshold and equal to or greater than a second threshold, some of the multiple channels are placed in the time interval and the remaining channels are not placed in the time interval.

[0250] In one embodiment of the present disclosure, the circuitry allocates signals of the portion of channels to resources set for the remaining channels.

[0251] In one embodiment of the present disclosure, the portion of channels is any one of a channel for transmitting a data signal, a channel for transmitting allocation information of the data signal, a channel for transmitting a response signal to the data signal, and a broadcast channel.

[0252] In one embodiment of the present disclosure, the certain channels are either a channel for transmitting a data signal or a channel for transmitting allocation information of the data signal, and a channel for transmitting a response signal to the data signal.

[0253] In one embodiment of the present disclosure, a channel for sidelink transmission is arranged in the time interval.

[0254] In a communication method according to one embodiment of the present disclosure, a terminal determines an arrangement of one or more channels in a time interval based on information regarding the number of symbols available in the time interval, and transmits the channels according to the arrangement.

[0255] The disclosures of the specification, drawings and abstract contained in Japanese Patent Application No. 2019-137127, filed on July 25, 2019, are incorporated herein by reference in their entirety. [Industrial Applicability]

[0256] An embodiment of the present disclosure is useful in a mobile communication system. [Explanation of symbols]

[0257] 100 base stations 101,210 PSFCH setting unit 102,211 Resource pool setting section 103 Error correction coding unit 104 Modulation section 105 Signal allocation unit 106 Transmitter 107,201 Receiver 108,202 Signal separation section 109 Demodulation section 110 Error correction decoding unit 200 terminals 203 SCI Receiver 204 Uu demodulation section 205 Uu error correction decoding unit 206 SL demodulation section 207 SL error correction decoding unit 208 PSFCH receiver 209 ACK / NACK generation section 212 SCI generation section 213 Uu Error Correction Coding Unit 214 Uu Modulation Section 215 SL Error Correction Coding Unit 216 SL modulation section 217 Signal Allocation Unit 218 Transmitter< / psfch> < / pssch>

Claims

1. a circuit for determining a first number of symbols or a second number of symbols based on information on the number of symbols available in a certain time interval, determining the number of one or more channels and the type of the one or more channels to be arranged in the time interval when the number of symbols is the first number of symbols, and determining the number of one or more channels and the type of the one or more channels different from the number of the first number of symbols when the number of symbols is the second number of symbols; a receiver for receiving the one or more channels arranged in the time interval; A terminal comprising:

2. the number of channels arranged in the time interval in which the number of symbols is equal to or greater than the threshold is greater than the number of channels arranged in the time interval in which the number of symbols is less than the threshold; The terminal according to claim 1.

3. The threshold value is set according to at least one of a type of a channel and a combination of channels to be allocated to the time interval. The terminal according to claim 2.

4. The number of symbols equal to or greater than a threshold is set in the time interval in which a channel for receiving a response signal to a data signal is allocated. The terminal according to claim 1.

5. In the time period in which a plurality of channels are set, if the number of symbols is equal to or greater than a first threshold, the plurality of channels are arranged in the time interval; when the number of symbols is less than the first threshold and is equal to or greater than the second threshold, some of the channels are arranged in the time interval and the remaining channels are not arranged in the time interval; The terminal according to claim 1.

6. The circuit allocates signals of the part of the channels to resources set for the remaining channels. The terminal according to claim 5.

7. The part of channels is any one of a channel for receiving a data signal, a channel for receiving allocation information of the data signal, a channel for receiving a response signal to the data signal, and a broadcast channel. The terminal according to claim 5.

8. The part of channels is one of a channel for receiving a data signal and a channel for receiving allocation information of the data signal, and a channel for receiving a response signal to the data signal. The terminal according to claim 5.

9. A channel for sidelink reception is arranged in the time period. The terminal according to claim 1.

10. The terminal is determining a first number of symbols or a second number of symbols based on information on a number of symbols available in a certain time interval, determining a number of one or more channels and a type of the one or more channels to be arranged in the time interval when the number of symbols is the first number of symbols, and determining a number of the one or more channels and a type of the one or more channels that are different from those in the first number of symbols when the number of symbols is the second number of symbols; receiving the one or more channels arranged in the time interval; Receiving method.

11. a process of determining a first number of symbols or a second number of symbols based on information on the number of symbols available in a certain time interval, determining the number of one or more channels and the type of the one or more channels to be arranged in the time interval when the number of symbols is the first number of symbols, and determining the number of the one or more channels and the type of the one or more channels that are different from those in the first number of symbols when the number of symbols is the second number of symbols; and a process for receiving the one or more channels arranged in the time interval. Integrated circuits.

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