Communication device and wireless communication method

Abstract

To facilitate assurance of a system performance.SOLUTION: A communication apparatus includes: a receiver that receives a PSCCH or a PSSCH; and a transmitter that transmits a PSFCH in accordance with the PSCCH or the PSSCH to be received in a resource determined in at least partially accordance with the resource for receiving the PSCCH or the PSSCH. The association relation of the PSCCH or the PSSCH and the PSFCH is set on the basis of an UE ID, and a priority of the PSFCH is determined on the basis of a priority of the PSCCH or the PSSCH to be related. The transmitter compares the priority of the PSFCH with the priority of another PSFCH scheduled so as to be receives or transmitted at the same time, and determines whether or not to transmit the PSFCH.SELECTED DRAWING: Figure 9

Description

Technical Field

[0001] The present disclosure relates to the field of wireless communication, and more particularly to a communication device such as a user equipment (UE) and a wireless communication method related to the design of a Physical Sidelink Feedback Channel (PSFCH) for a New Radio (NR) sidelink.

Background Art

[0002] The concept of the Physical Sidelink Feedback Channel (PSFCH) is adopted for automatic repeat request feedback in groupcast and unicast-based transmissions of NR (New Radio) V2X (Vehicle to anything). There is a half-duplex problem in NR V2X. That is, a user equipment cannot transmit and receive simultaneously on one or more carriers. Such a half-duplex problem is caused by a large interference between a transmitter and a receiver.

Summary of the Invention

Problems to be Solved by the Invention

[0003] In LTE V2X, the half-duplex problem is solved by randomized retransmissions. Specifically, in LTE V2X, the sidelink channel is transmitted in one or more repetitions, and even if there is a collision in the first transmission of the Physical Sidelink Control Channel (PSCCH) or the Physical Sidelink Shared Channel (PSSCH), the receiving user equipment can receive the packet based on the reception of the randomized retransmission of the PSCCH / PSSCH transmitted from the transmitting user equipment without collision. So far, the discussion on PSFCH in NR is still in its initial stage, and in order to save overhead, how to indicate the position of PSFCH in the time and frequency domains of the carrier, solutions to PSFCH collisions, and the configuration of PSFCH are being discussed.

[0004] One non-limiting, exemplary embodiment facilitates determining resources for sidelink communication, sidelink discovery, or any other sidelink processes in NR and ensuring system performance.

Means for Solving the Problem

[0005] In an embodiment of the present disclosure, a communication device includes a transmitter that transmits a Physical Sidelink Control Channel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH), and a receiver that receives a Physical Sidelink Feedback Channel (PSFCH) associated with the transmitted PSCCH or PSSCH in a resource determined at least partially according to a resource for transmitting the PSCCH or PSSCH. An association relationship between the PSCCH or the PSSCH and the PSFCH is set based on a User Equipment Identifier (UE ID), a priority of the PSFCH is determined based on a priority of the associated PSCCH or PSSCH, and the receiver compares a priority of the PSFCH with priorities of other PSFCHs scheduled to be transmitted or received simultaneously with the priority of the PSFCH to determine whether to receive the PSFCH.

[0006] In other embodiments of the present disclosure, a wireless communication method for a communication device, including transmitting a Physical Sidelink Control Channel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH), and receiving a Physical Sidelink Feedback Channel (PSFCH) related to the transmitted PSCCH or PSSCH in a resource determined at least partially according to a resource for transmitting the PSCCH or PSSCH, wherein an association relationship between the PSCCH or the PSSCH and the PSFCH is set based on a User Equipment Identifier (UE ID), a priority of the PSFCH is determined based on a priority of the related PSCCH or PSSCH, and a priority of the PSFCH is compared with priorities of other PSFCHs scheduled to be transmitted or received simultaneously with the priority of the PSFCH to determine whether to receive the PSFCH.

[0007] Note that general or specific embodiments may be implemented as a system, a method, an integrated circuit, a computer program, a storage medium, or any selective combination thereof.

[0008] Additional advantages and effects of the disclosed embodiments will become apparent from the specification and the drawings. The advantages and / or effects may be individually obtained by various embodiments and features in the specification and the drawings, and it is not necessary that all of these are provided to obtain one or more of such advantages and / or effects.

Brief Description of the Drawings

[0009] The above and other features of the present disclosure will become more fully apparent from the following description and the appended claims, taken in conjunction with the accompanying drawings. It is to be understood that these drawings illustrate only some embodiments according to the present disclosure and are not to be considered as limiting its scope, and the present disclosure will be described with further specificity and detail by using the accompanying drawings.

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Mode for Carrying Out the Invention

[0010] In the following detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, like symbols typically identify like components, unless the context dictates otherwise. Aspects of the present disclosure can be arranged, substituted, combined, and designed in a wide variety of different configurations, all of which are explicitly contemplated and will be readily understood to form part of the present disclosure.

[0011] In an embodiment of the present disclosure, an exemplary scenario of sidelink transmission in NR V2X as shown in FIG. 1 is provided. In FIG. 1, communication can be performed between vehicles 101, 102, and 103 via sidelink transmission. Specifically, vehicle 101 transmits PSCCH / PSSCH to vehicle 103, and in response, vehicle 103 transmits PSFCH to vehicle 101 to acknowledge receipt of the PSCCH / PSSCH. The same process also applies to the communication between vehicle 103 and 102, and between vehicle 102 and 101. Here, in FIG. 1, the sidelink is shown as one-way (i.e., from vehicle 101 to vehicle 103, from vehicle 103 to vehicle 102, and from vehicle 102 to vehicle 101), but this is for illustrative purposes, and it should be noted that each vehicle can transmit and receive PSCCH / PSSCH / PSFCH as a transmitting vehicle and a receiving vehicle to any of the other vehicles. Such sidelink communication may or may not be performed based on control information from base station 200, as specified in each of the following embodiments.

[0012] Specifically, refer to FIG. 2. FIG. 2 shows a block diagram regarding a method for determining the PSFCH resources of other UEs that affect the transmission resource selection. Taking vehicle 103 in the exemplary scenario of FIG. 1 as a specific example, it selects resources for PSCCH / PSSCH transmission. As shown in FIG. 2, vehicle 103 receives PSCCH and / or PSSCH from vehicle 101 in the detection window, and during that period, vehicle 103 receives the control channel and determines the interference in subsequent symbols or slots based on the PSCCH and / or PSSCH. Then, vehicle 103 identifies that it needs to transmit the PSFCH associated with the received PSCCH and / or PSSCH in order to allow vehicle 101 to receive the PSCCH / PSSCH in the resource selection window. During that period, vehicle 103 may select resources for subsequent transmission of PSCCH and / or PSSCH and transmit the PSFCH. The specific resources for the PSFCH may be based on fixed or designated HARQ timing rules. Since the estimation of the PSFCH may not be known, vehicle 103 will exclude the resources used for transmitting the PSFCH from the resources used for PSCCH / PSSCH transmission in the resource selection window.

[0013] There is a one-to-one mapping between the PSFCH associated with the PSSCH / PSCCH, as shown in FIG. 3. FIG. 3 shows a detailed block diagram of the mapping between the PSFCH and the associated PSSCH / PSCCH in the sidelink transmission of NR V2X in the time domain. Each of the PSSCH and PSCCH has a corresponding PSFCH for confirming the reception / decoding state of the associated PSSCH / PSCCH. In the example of FIG. 3, the vehicle transmits a PSSCH or PSCCH in slot #0 and receives the associated PSFCH of the PSSCH or PSCCH transmitted in slot #4. Similarly, the vehicle transmits a PSSCH or PSCCH in slot #2 and receives the associated PSFCH of the PSSCH or PSCCH transmitted in slot #6. Note that both the transmission of the PSSCH / PSCCH and the reception of the PSFCH may or may not have repetition, which will be described in detail in the following embodiments.

[0014] Furthermore, for each PSCCH / PSSCH, its frequency position is also mapped together with the frequency position of the associated PSFCH. Referring to FIG. 4, for example, the PSCCH included in the resource of frequency part #1 can correspond to the acknowledgment information PSFCH in the resource of frequency part #2 (e.g., PRB #2), and the PSCCH included in the resource of frequency part #2 can correspond to the acknowledgment information PSFCH in the resource of frequency part #1 (e.g., PRB #1). It should be noted that the unit of the corresponding relationship of the positions is not limited to the PRB according to the granularity.

[0015] FIG. 5a shows a block diagram of a user equipment (UE) 100 according to an embodiment of the present disclosure. Here, the UE 100 can represent any one of vehicles 101, 102, and 103 or any other V2X terminal. The UE 100 includes a transmitter 110 operable to transmit a PSCCH or a PSSCH, and a receiver 120 operable to receive a PSFCH related to the transmitted PSCCH or PSSCH in a resource determined at least in part according to a resource for transmitting the PSCCH or PSSCH. Here, the term "resource determined at least in part" represents a resource determined only according to a resource for transmitting a PSCCH or a PSSCH, a resource determined according to a resource for transmitting a PSCCH or a PSSCH, and, for example, a case of control information from a gNB or a transmitting UE.

[0016] In particular, the transmitter 110 of the UE 100 can transmit a PSCCH or a PSSCH to a target user equipment via sidelink transmission. When the target user equipment receives the PSCCH or the PSSCH transmitted by the UE 100, the target user equipment transmits a PSFCH to the UE 100. The PSFCH is transmitted on a resource, and the resource is determined according to a resource for a PSCCH or a PSSCH transmitted from the UE 100 to the target user equipment. On the other hand, the receiver 120 of the UE 100 receives the PSFCH transmitted from the target user equipment to the UE 100 in a resource determined according to a resource for a PSCCH or a PSSCH.

[0017] According to the above embodiment of the present disclosure, the user equipment can receive a PSFCH in a resource determined based on a resource for transmitting a PSCCH or a PSSCH without the need for a base station or a user equipment to notify resource position information of the PSFCH. In this way, the resource overhead is reduced.

[0018] Embodiments of the present disclosure can also be applied to a scenario as shown in FIG. 5b. FIG. 5b shows a scenario where sidelink communication between UEs (e.g., between UE100 and the target UE as described in the above embodiments) is under the control of a base station (i.e., gNB). Specifically, the gNB can transmit Sidelink DCI (Downlink Control Indicator) to the transmitting (TX) UE (e.g., UE100), and the Sidelink DCI may include control information for sidelink communication. After receiving the Sidelink DCI, the transmitting UE can transmit the Sidelink Control Indicator (SCI) included in the PSCCH to the receiving (Rx) UE to notify, for example, control information for the transmission of the PSSCH (here, the transmission of the PSCCH can follow the transmission of the PSSCH or be simultaneous with the transmission of the PSSCH). Accordingly, the receiving UE transmits the PSFCH to the transmitting UE as feedback for PSSCH reception. In the above scenario, the PSFCH can be transmitted or received on a resource determined according to the resource for the related PSCCH / PSSCH, regardless of the control information notified by the Sidelink DCI or SCI according to the embodiments of the present disclosure.

[0019] In a further specific example, embodiments of the present disclosure can be applied to a scenario as shown in FIG. 5c. FIG. 5c shows another scenario where sidelink communication between the transmitting UE and the receiving UE is under the control of a base station (i.e., gNB). In this case, after the receiving UE receives the PSSCH, in order to permit the gNB to receive the PSSCH from the transmitting UE, the receiving UE transmits a HARQ-ACK to the gNB as feedback via the PUCCH. In the above scenario, similar to the PSFCH described in other embodiments of the present disclosure, the resource determination of the PUCCH can be based on the related PSCCH / PSSCH transmitted by the transmitting UE, regardless of the control information notified by the Sidelink DCI or SCI according to the embodiments of the present disclosure.

[0020] FIG. 6 schematically shows an exemplary scenario of PSFCH reception according to an embodiment of the present disclosure. From FIG. 6, the transmission of the PSFCH from the target user equipment is in the resource determined by the last transmission of the PSCCH / PSSCH (e.g., retransmission of the PSCCH / PSSCH). In particular, the resource in the time domain for the PSFCH is within a gap of one or more symbols or slots from the resource in the time domain for the associated PSCCH or PSSCH, and the resource in the frequency domain for the PSFCH is within a gap of one or more Physical Resource Blocks (PRBs) from the resource in the frequency domain for the associated PSCCH or PSSCH. Here, the term "gap" can represent the difference between the start position of the PSCCH / PSSCH and the start position of the PSFCH, the difference between the start position of the PSCCH / PSSCH and the end position of the PSFCH, the difference between the end position of the PSCCH / PSSCH and the end position of the PSFCH, or the difference between the end position of the PSCCH / PSSCH and the start position of the PSFCH in the time domain or frequency domain. The number of symbols or slots can be preset, set, specified, or any combination thereof according to the standard, and the number of PRBs can be preset, set, specified, or any combination thereof according to the standard.

[0021] In an embodiment according to the present disclosure, that a parameter "can be preset, set, specified, or any combination thereof according to the standard" means that such a parameter "can be preset in the user equipment, set by the base station, specified according to the standard, or any combination thereof".

[0022] For example, as shown in FIG. 6, the resources for the PSFCH are within a gap of, for example, 2 slots (i.e., slot #6 - slot #4 = 2 slots) from the resources for the associated PSCCH or PSSCH and are in the same PRB (i.e., F3 = F2). In the case where there is repetition of PSCCH / PSSCH transmission, at least one of the start slot and the PRB (Physical Resource Block) of the resources for the first transmission of the PSFCH can be determined by the first transmission and / or retransmission of the associated PSCCH or PSSCH. For example, the transmission of the PSFCH is within a gap of, for example, 2 slots (i.e., slot #6 - slot #4 = 2 slots) from the last slot of the retransmission of the associated PSCCH / PSSCH, and the transmission of the PSFCH is within a gap of 2 PRBs from the last PRB of the first transmission of the associated PSCCH / PSSCH.

[0023] In an embodiment, at least one of the start slot and the PRB of the resources for the first transmission of the PSFCH is notified by the SCI received by the user equipment. According to the above embodiment, without the need to notify the repeated resource positions, the resource overhead can be reduced to only notify the resource position of the first PSFCH, and the PSFCH can be set more flexibly at each transmission according to the target user equipment.

[0024] In an embodiment, the number of symbols or slots for the gap between the first transmission and the associated PSCCH / PSSCH can be preset, set, specified, or any combination thereof according to the standard. Similarly, the number of PRBs can be preset, set, specified, or any combination thereof according to the standard.

[0025] In the case where there are repetitions of PSFCH and PSCCH / PSSCH, the timing gap between the PSFCH and its repetition can be made the same as the timing gap (e.g., 2 slots) between the associated PSCCH or PSSCH and its repetition. In an embodiment, the frequency gap between the PSFCH transmission and its repetition can be made the same as the frequency gap (e.g., 2 PRBs) between the associated PSCCH or PSSCH and its repetition. Here, the timing gap and / or frequency gap between the PSFCH and its repetition may be different for each UE. Note that FIG. 6 shows the case of retransmission, but the present disclosure is not limited to the case where the transmission of PSCCH / PSSCH or PSFCH has repetitions.

[0026] In an embodiment, the number of repetitions for the PSFCH is the same as the number for the associated PSCCH or PSSCH, or is in a relationship derived from the number for the associated PSCCH or PSSCH. For example, when the PSCCH / PSSCH is transmitted by 2 repetitions, the PSFCH can be transmitted by 2 repetitions (i.e., the same number of repetitions as the PSCCH / PSSCH) or 4 repetitions (i.e., proportional to the number of repetitions of the PSCCH / PSSCH). Such ratios can be preset, set, specified, or any combination thereof according to the standard.

[0027] According to the above embodiments of the present disclosure, in the case where there are repetitions of transmissions for PSCCH / PSSCH and / or PSFCH, the user equipment can receive each PSFCH at a resource determined based on the resources of the associated PSCCH or PSSCH and its repetition, thereby saving the resource overhead for notifying the resource positions for the PSFCH and its repetition.

[0028] FIG. 7 shows a block diagram of the randomized gap between the first transmission and retransmission of PSCCH / PSSCH. Specifically, even if the first transmission of PSCCH / PSSCH of UE1 collides with the first transmission of PSCCH / PSSCH of UE2, the retransmission of PSCCH / PSSCH of UE1 and the retransmission of PSCCH / PSSCH of UE2 do not collide in the time domain due to the randomized gap between the first transmission and retransmission of PSCCH / PSSCH from UE1 and UE2.

[0029] Based on the above randomized gap between the first transmission and retransmission of PSCCH / PSSCH, the user equipment according to an embodiment of the present disclosure can also solve the problem of PSFCH reception / transmission collision or provide an optimized solution. FIG. 8 schematically shows an exemplary scenario of PSFCH reception according to an embodiment of the present disclosure. Specifically, when the first transmission of PSCCH / PSSCH of UE1 competes with the PSCCH / PSSCH of UE2, as described above, the retransmissions of UE1 and UE2 do not have any collision due to the randomization of the gap between the first transmission and retransmission of PSCCH / PSSCH. Since the resources for the transmission of PSFCH are determined according to the resources for the associated PSCCH / PSSCH, the transmissions of PSFCH of UE1 and UE2 can also prevent collisions accordingly. Further, in order to further randomize the repeated gap of PSFCH, the association relationships of different UEs between PSCCH / PSSCH and PSFCH may be preset, set or specified differently, for example, based on UE ID or RRC signaling.

[0030] More specifically, referring to FIG. 8, when a collision occurs in the first transmission of the PSCCH / PSSCH of UE1 and UE2 in slot #2, the retransmission of the PSCCH / PSSCH of UE1 can be determined to be, for example, in slot #4, and the retransmission of the PSCCH / PSSCH of UE2 can be determined to be in a slot other than slot #4, for example, in slot #5. As described above, the resources for the transmission of the PSFCH are within a gap of, for example, two slots from the resources for the last transmission of the PSCCH / PSSCH (i.e., in this case, the retransmission of the PSCCH / PSSCH). Therefore, the resources for the transmission of the PSFCH of UE1 are in slot #6 (i.e., two slots from slot #4), and the resources for the transmission of the PSFCH of UE2 are in slot #7 (i.e., two slots from slot #5). The frequency-domain resources for the PSFCH of UE1 are within a gap of, for example, 4 PRBs from the frequency-domain resources for the PSCCH / PSSCH of UE1 (i.e., the first transmission of the PSCCH / PSSCH of UE1 in FIG. 8), and the frequency-domain resources for the PSFCH of UE2 are within a gap of, for example, 4 PRBs from the frequency-domain resources for the PSCCH / PSSCH of UE2 (i.e., the first transmission of the PSCCH / PSSCH of UE2 in FIG. 8).

[0031] For the case where there is a repetition of the PSFCH transmission, in an embodiment, the frequency gap between the PSFCH transmission and its repetition is the same as the frequency gap (e.g., two PRBs) between the associated PSCCH or PSSCH and its repetition, and in an embodiment, the number of repetitions for the PSFCH is the same as or a derived relationship with that for the associated PSCCH or PSSCH. As shown in FIG. 8, the resources for the retransmission of the PSFCH are two slots away from the resources for its first transmission in the time domain, and the resources for the retransmission of the PSFCH are 4 PRBs away from the resources for its first transmission in the time domain.

[0032] FIG. 9 shows a block diagram of a UE 300 according to another embodiment of the present disclosure. The UE 300 operates to transmit a first Physical Sidelink Feedback Channel (PSFCH) related to a received Physical Sidelink Control Channel (PSCCH) or Physical Sidelink Shared Channel (PSSCH), or to receive a second PSFCH related to a transmitted PSCCH or PSSCH. A transceiver 310 and a circuit 320 that operates to determine whether to transmit the first PSFCH, or to transmit a first contention channel scheduled to be received simultaneously with the transmission of the first PSFCH, based on a comparison between the priority of the first PSFCH and the priority of the first contention channel, or to receive the second PSFCH, or to transmit a second contention channel scheduled to arrive simultaneously with the reception of the second PSFCH, based on a comparison between the priority of the second PSFCH and the priority of the second contention channel. Note that the transceiver 310 can represent a combination of a transmitter and a receiver having a similar configuration to the transmitter 110 and the receiver 120 of FIG. 5a.

[0033] In an embodiment according to the present disclosure, a contention channel represents, for example, a channel scheduled to be transmitted simultaneously (e.g., in a time slot) with the PSFCH, or a channel whose scheduled transmission timing at least partially overlaps with the PSFCH or the like.

[0034] Specifically, when there is a collision between the transmission / reception of PSFCH and other channels, the circuit 320 of the UE 300 determines the process to be executed in advance. For example, in the case of a collision in the time domain between the reception of other channels such as PSCCH / PSSCH or PSFCH and the transmission of PSFCH, the circuit 320 determines whether to receive the scheduled competing channel based on the comparison between the priority of PSFCH and the priority of the competing channel before the collision time, or to transmit PSFCH. Similarly, in the case of a collision in the time domain between the reception of PSFCH and the transmission of other channels, such as PSCCH / PSSCH or PSFCH, the circuit 320 determines whether to transmit the scheduled competing channel based on the comparison between the priority of PSFCH and the priority of the competing channel before the collision time, or to receive PSFCH. Once the circuit 320 determines the process to be executed, the transceiver 310 can perform the transmission or reception of PSFCH or the competing channel accordingly. In the embodiment, since the concern of collision is addressed by the determination process before the collision, there is no repetition for PSFCH transmission.

[0035] According to the above embodiment, the user equipment according to the present disclosure can determine the transmission / reception of PSFCH to prevent collisions even without repetition of PSFCH, thereby reducing the resource allocation for PSFCH.

[0036] Next, referring to FIG. 10, FIG. 10 schematically shows another exemplary scenario of PSFCH reception according to an embodiment of the present disclosure. In the embodiment, the priority of PSFCH is determined based on the priority of the related PSCCH or PSSCH, for example, the priority 1 shown in the figure. For example, in the above embodiment, the priority of the transmitted PSFCH is determined based on the priority of the related PSCCH or PSSCH received by the UE 300, and the priority of the received PSFCH is determined based on the priority of the related PSCCH or PSSCH transmitted from the UE 300.

[0037] According to the above embodiments, since the priority of PSSCH / PSCCH can reflect the priority of the related PSFCH most of the time, the user equipment does not need to assign the priority of each PSFCH before transmitting the PSFCH.

[0038] In the embodiments, the resources for transmitting or receiving PSFCH are determined according to the resources for receiving or transmitting the related PSCCH or PSSCH. Specifically, the resource position for transmitting or receiving PSFCH can be determined by the resource position of the related PSCCH / PSSCH received or transmitted respectively, and in the case where there is a repetition for PSCCH / PSSCH transmission, as described in the above embodiments with details omitted, the resource position of the first transmission / retransmission of the related PSCCH / PSSCH.

[0039] In the embodiments, when the priority of the transmitted channel is the same as the priority of the received channel, the priority of transmission is prior to reception. Note that the priorities of transmission and reception with the same priority may be different based on different configurations.

[0040] FIG. 11 schematically shows the details of PSFCH reception according to an embodiment of the present disclosure. Specifically, for example, in slot #7, there is a collision between the PSFCHs transmitted from UE1 and UE2, and UE1 corresponding to UE300 determines whether to receive the PSFCH transmitted from UE2 before slot #7 (e.g., slot #6), or to transmit the PSFCH to UE2 in slot #7. The same processing can be performed for UE2. Specifically, UE2 can determine whether to receive the PSFCH transmitted from UE1 before slot #7 (e.g., slot #6), or to transmit the PSFCH to UE1 in slot #7. Here, the priority of the PSFCH transmitted by UE1 has the same priority (priority 2) as the related PSCCH / PSSCH received by UE1, and the priority of the PSFCH transmitted by UE2 has the same priority (priority 1) as the related PSCCH / PSSCH received by UE2. In this case, since the PSFCH of UE2 has a higher priority (priority 1) than the PSFCH of UE1 (priority 2), in slot #6, UE1 decides to receive the PSFCH transmitted from UE2, and UE2 decides to transmit the PSFCH to UE1.

[0041] FIG. 12 schematically shows the details of PSFCH reception according to an embodiment of the present disclosure. In this case, it is described that UE3 transmits PSCCH / PSSCH to UE1 and UE2 and receives PSFCH from UE1 and UE2. In time slot #N, there is a collision between the PSFCH reception (priority 3) from UE1 in response to the transmission of the related PSCCH / PSSCH to UE1 and the PSCCH / PSSCH transmission (priority 2) to UE2, and UE3 determines the transmission of the PSCCH / PSSCH to UE2 by priority ranking in slot #N. In the case of repetition of PSFCH, PSCCH, and PSSCH, for retransmission processing, UE3 raises the priority of retransmission of the channel (e.g., the PSFCH from UE1) that is determined not to be transmitted or received at the time of collision (from priority 3 to priority 1). According to the above embodiment, the priority of the channel can be dynamically adjusted, and the transmission efficiency can be globally optimized.

[0042] FIG. 13 schematically shows an exemplary scenario of resource allocation references for transmitted PSFCH and received PSFCH according to an embodiment of the present disclosure. Specifically, the priority of a transmitted channel (e.g., PSFCH in carrier 1) is determined based on the channel level, and the priority of a received channel (e.g., PSCCH / PSSCH in carrier 2) is determined based on the resource pool level. Here, the resource pool may represent a resource unit for a user equipment to transmit or receive a channel (e.g., PSCCH, PSSCH, or PSFCH). For example, the priority can be preset by a higher level in the received resource pool representing the priorities of all channels (e.g., PSCCH and PSSCH) included in the received resource pool of carrier 2 as shown in FIG. 13, and the UE determines whether to transmit the PSFCH of carrier 1 or receive the received resource pool of carrier 2 in slot #7 by comparing the priority of the PSFCH at the channel level with the priority of the PSCCH / PSSCH at the resource pool level.

[0043] In an embodiment, the priority of a channel defined at the channel level can be the same as or have a pre-set relationship with the priority of the channel defined at the same channel level. That is, the definition of priority at the resource pool level can be the same as or equivalent to the priority at the channel level. In this way, the user equipment can understand the priority of the transmitted channel (e.g., PSFCH) and the received channel (e.g., PSCCH / PSSCH) in the same way at different granularity levels. For example, for PSFCH / PSCCH / PSSCH, the priority level can be defined by 0 to 7 (i.e., 8 levels in descending order), and the resource pool can be defined by the same level. The priority of a specific PSFCH / PSCCH / PSSCH is equivalent to the priority of a specific resource pool. In an embodiment, the priorities at the channel level and the resource pool level can be pre-set, set, specified, or any combination thereof according to the standard.

[0044] FIG. 14 schematically shows a specific example of an NR carrier according to an embodiment of the present disclosure. In particular, in the embodiment, the user equipment includes a transmitter that operates to transmit PSCCH or PSSCH and a receiver that operates to receive PSFCH, and the PSFCH is allocated in the same resource pool as the resource pool of PSCCH or PSSCH. Here, the configuration of the user equipment can be the same as the configuration of UE100 in FIG. 5a.

[0045] As shown in FIG. 14, in the above embodiment, the resources for the transmission of PSCCH / PSSCH and the reception of PSFCH can be allocated in the same slot or resource pool (or other timing units according to the granularity) without overlapping in the time domain. According to the above embodiment, the user equipment can minimize the influence on the detection process and resource selection of PSSCH or PSCCH in the same carrier.

[0046] In an embodiment, the PSFCH is allocated to a symbol located at the end of a slot in a resource pool. According to the above embodiment, the notification of the resource position of the PSFCH can be omitted, thereby optimizing the resource overhead.

[0047] In an embodiment as shown in FIG. 15, the number of symbols in a slot of the resource pool for the PSFCH is not more than that for the PSCCH or PSSCH. In an embodiment, the number of symbols in a slot of the resource pool for the PSFCH is based on that for the PSCCH or PSSCH. For example, the number of symbols in a slot of the resource pool for the PSFCH is 1, while the number of symbols in a slot of the resource pool for the PSCCH or PSSCH is 2 (i.e., proportional). In an embodiment, the number of symbols in a slot of the resource pool for the PSFCH may be equal to the number of remaining slots in a resource pool other than the number of slots in the resource pool for the related PSCCH / PSSCH. According to the above embodiment, the setting process of the PSFCH resource can be simplified.

[0048] FIG. 16 schematically shows a specific example of a communication flowchart between a transmitting user device and a receiving user device according to an embodiment of the present disclosure. In particular, a specific example of a communication method flowchart between any one of the UE100 in FIG. 5a or the vehicles 101, 102, and 103 according to an embodiment of the present disclosure and another UE400 is shown. Here, the UE400 can have the same configuration as the UE100.

[0049] As shown in FIG. 16, in step ST1601, the UE100 and 400 may be connected to each other in a connection procedure that is optional in an embodiment of the present disclosure. The connection may be established by implementing a known or future-developed method, the details of which are omitted here.

[0050] In ST1602, UE100 transmits PSCCH / PSSCH to UE400 via sidelink transmission. In response thereto, in step ST1603, UE400 transmits PSFCH related to the PSCCH / PSSCH according to the source of the related PSCCH / PSSCH. That is, UE100 receives PSFCH related to the PSCCH / PSSCH according to the source for transmitting the PSCCH / PSSCH. It should be noted that UE100 may receive PSFCH related to the PSCCH / PSSCH partially according to the source for transmitting the PSCCH / PSSCH.

[0051] According to the procedure of the embodiment of the present disclosure above, the user equipment can receive PSFCH at a resource determined based on the resource for transmitting PSCCH or PSSCH without the need for the base station or the user equipment to notify the resource position information of the PSFCH. In this way, the resource overhead becomes more efficient.

[0052] FIG. 17 schematically shows another specific example of a flowchart of communication between a transmitting user equipment and a receiving user equipment according to an embodiment of the present disclosure. In particular, a specific example of a flowchart of a communication method between any one of UE300 in FIG. 9 or vehicles 101, 102, and 103 according to an embodiment of the present disclosure and another UE500 is shown. Here, UE500 may have the same configuration as UE300.

[0053] As shown in FIG. 17, in step ST1701, UE300 and 500 may be connected to each other in a connection procedure that is optional in the embodiment of the present disclosure. The connection may be established by implementing a known or future-developed method, and the details thereof are omitted here.

[0054] In step ST1702, UE300 determines whether to transmit the PSFCH or to receive a colliding channel (e.g., PSCCH / PSSCH / PSFCH) scheduled to be received from UE500 at the same time as transmitting the PSFCH, based on a comparison between the priority of the PSFCH and the priority of the colliding channel (e.g., PSCCH / PSSCH / PSFCH) from UE500. Specifically, when there is a collision between PSFCH transmission / reception and other channels, UE300 determines the process to be executed in advance. In the case of a collision in the time domain between the transmission of the PSFCH and the reception of other channels, e.g., PSCCH / PSSCH or PSFCH, UE300 determines whether to transmit the PSFCH before the collision time or to receive the colliding channel scheduled based on a comparison between the priority of the PSFCH and the priority of the colliding channel. Then, based on the determination in ST1703, UE300 can execute the reception of the PSFCH from UE500 or the transmission of the colliding channel to UE500. In the embodiment, since the concern of collision is addressed by the pre-collision determination process, there is no repetition for PSFCH transmission.

[0055] According to the above procedure, the user equipment according to the present disclosure can determine the transmission and reception of the PSFCH to prevent collision even without repetition of the PSFCH, thereby reducing the resource allocation for the PSFCH.

[0056] In the embodiment, the priority of the PSFCH is determined based on the priority of the related PSCCH or PSSCH, e.g., the illustrated priority 1. For example, in the above embodiment, the priority of the transmitted PSFCH is determined based on the priority of the related PSCCH or PSSCH received by UE300, and the priority of the received PSFCH is determined based on the priority of the related PSCCH or PSSCH transmitted from UE300.

[0057] In an embodiment, the resources for transmitting or receiving a PSFCH are determined according to the resources for receiving or transmitting the related PSCCH or PSSCH. Specifically, the resource positions for transmitting or receiving a PSFCH can be determined by the resource positions of the related PSCCH / PSSCH to be received or transmitted respectively, and when there is a repetition for PSCCH / PSSCH transmission as described in the above embodiment with details omitted, by the first / retransmission resource positions of the related PSCCH / PSSCH.

[0058] In an embodiment, when the priority of the transmitted channel is the same as that of the received channel, the transmission priority is given precedence over reception. Note that the priorities of transmission and reception with the same priority may be changed based on different configurations.

[0059] Similarly, as shown in FIG. 18, another specific example of a communication flowchart between a transmitting user device and a receiving user device according to an embodiment of the present disclosure is provided. In particular, a specific example of a communication method flowchart between any one of UE300 in FIG. 9 or vehicles 101, 102, and 103 according to an embodiment of the present disclosure and another UE500 is shown. Here, UE300 and 500 can have the same configuration as UE300 and 500 in FIG. 17.

[0060] As shown in FIG. 18, in step ST1801, UE300 and 500 may connect to each other through a connection procedure that is optional in the embodiment of the present disclosure. The connection may be established by implementing a known or future-developed method, and the details are omitted here.

[0061] In step ST1802, the UE 300 determines whether to receive the PSFCH or to transmit a contention channel (e.g., PSCCH / PSSCH / PSFCH) scheduled to be received from the UE 500 simultaneously with receiving the PSFCH, based on a comparison between the priority of the PSFCH and the priority of the contention channel (e.g., PSCCH / PSSCH / PSFCH) from the UE 500. Specifically, when there is a collision between PSFCH transmission / reception and other channels, the UE 300 determines a process to be executed in advance. In the case of a time-domain collision between PSFCH reception and the transmission of other channels, e.g., PSCCH / PSSCH or PSFCH, the UE 300 determines whether to receive the PSFCH or to transmit a contention channel scheduled based on a comparison between the priority of the PSFCH and the priority of the contention channel before the collision time. After determining the process to be executed by the UE 300, in step ST1803, the UE 300 can execute receiving the PSFCH from the UE 500 or transmitting the contention channel to the UE 500 based on the determination.

[0062] In an embodiment, the priority of the PSFCH is determined based on the priority of the related PSCCH or PSSCH, e.g., the illustrated priority 1. For example, in the above embodiment, the priority of the transmitted PSFCH is determined based on the priority of the related PSCCH or PSSCH received by the UE 300, and the priority of the received PSFCH is determined based on the priority of the related PSCCH or PSSCH transmitted from the UE 300.

[0063] In an embodiment, the resources for transmitting or receiving the PSFCH are determined according to the resources for receiving or transmitting the related PSCCH or PSSCH. Specifically, the resource position for transmitting or receiving the PSFCH can be determined by the resource position of the related PSCCH / PSSCH received or transmitted respectively, and when there is a repetition for PSCCH / PSSCH transmission, by the first / retransmission resource position of the related PSCCH / PSSCH, as described in the above embodiment with details omitted.

[0064] In an embodiment, when the priority of the transmitted channel is the same as the priority of the received channel, the transmission priority takes precedence over reception. Note that the transmission and reception priorities with the same priority may be changed based on different configurations.

[0065] FIG. 19 schematically shows another specific example of a flowchart of communication between a transmitting user device and a receiving user device according to an embodiment of the present disclosure. In particular, a specific example of a flowchart of a communication method between any one of UE100 in FIG. 5a or vehicles 101, 102, and 103 according to an embodiment of the present disclosure and another UE400 is shown. Here, UE400 can have the same configuration as UE100.

[0066] As shown in FIG. 19, in step ST1901, UE300 and 500 may be connected to each other in a connection procedure that is optional in an embodiment of the present disclosure. The connection may be established by implementing a known or future-developed method, and the details thereof are omitted here.

[0067] In step ST1902, UE100 can transmit PSCCH or PSSCH to UE400. In response thereto, in step ST1903, UE400 transmits PSFCH, and PSFCH is allocated to the same resource pool as PSCCH / PSSCH. That is, UE100 receives PSFCH, where PSFCH is allocated in the same resource pool as PSCCH / PSSCH.

[0068] In an embodiment, PSFCH is allocated in a symbol located at the end of a slot of the resource pool. According to the above procedure, notification of the resource position of PSFCH can be omitted, and the resource overhead is optimized.

[0069] In an embodiment, the number of symbols in a slot of the resource pool for PSFCH is not more than that for PSCCH or PSSCH. In an embodiment, the number of symbols in a slot of the resource pool for PSFCH is based on that for PSCCH or PSSCH. For example, the number of symbols in a slot of the resource pool for PSFCH is 1, while the number of symbols in a slot of the resource pool for PSCCH or PSSCH is 2 (i.e., proportional). According to the above procedure, the setting process of PSFCH resources can be simplified.

[0070] FIG. 20 shows a specific example of a flowchart of a communication method executed by a user equipment according to an embodiment of the present disclosure. For example, as shown in FIG. 5a, the wireless communication method 2000 can be applied to the UE 100.

[0071] As shown in FIG. 20, the wireless communication method 2000 starts at step S2001, and the UE 100 transmits PSCCH / PSSCH to a target UE via sidelink transmission. In response thereto, at step S2002, the UE 100 receives a PSFCH related to the PSCCH / PSSCH according to a source for transmitting the PSCCH / PSSCH. It should be noted that the UE 100 may receive a PSFCH related to the PSCCH / PSSCH partially according to a source for transmitting the PSCCH / PSSCH.

[0072] According to the procedure of the above embodiment of the present disclosure, the user equipment can receive a PSFCH at a resource determined based on a resource for transmitting PSCCH or PSSCH without the need for a base station or a user equipment to notify the resource position of the PSFCH. In this way, the resource overhead becomes more efficient.

[0073] FIG. 21 shows another specific example of a flowchart of communication between a transmitting user equipment and a receiving user equipment according to an embodiment of the present disclosure. For example, as shown in FIG. 9, the wireless communication method 2000 may be applied to the UE 300.

[0074] As shown in FIG. 21, the wireless communication method 2100 starts at step S2101, and the UE 300 determines whether to transmit the PSFCH or receive the contention channel scheduled to be received simultaneously with the transmission of the PSFCH based on the comparison between the priority of the PSFCH and the priority of the contention channel (e.g., PSCCH / PSSCH / PSFCH). Specifically, when there is a collision between the PSFCH transmission / reception and other channels, the UE 300 determines the process to be executed in advance. In the case of a collision in the time domain between the transmission of the PSFCH and the reception of other channels, e.g., PSCCH / PSSCH or PSFCH, the UE 300 determines whether to transmit the PSFCH before the collision time or receive the contention channel scheduled based on the comparison between the priority of the PSFCH and the priority of the contention channel. Then, the UE 300 can execute the reception of the PSFCH or the transmission of the contention channel based on the determination in step S2102. In the embodiment, since the concern of collision is addressed by the pre - collision determination process, there is no repetition for the PSFCH transmission.

[0075] According to the above procedure, the user equipment according to the present disclosure can determine the transmission and reception of the PSFCH to prevent collisions even without repetition of the PSFCH, thereby reducing the resource allocation for the PSFCH.

[0076] In the embodiment, the priority of the PSFCH is determined based on the priority of the related PSCCH or PSSCH, e.g., the priority 1 shown in the figure. For example, in the above - mentioned embodiment, the priority of the transmitted PSFCH is determined based on the priority of the related PSCCH or PSSCH received by the UE 300, and the priority of the received PSFCH is determined based on the priority of the related PSCCH or PSSCH transmitted from the UE 300.

[0077] In an embodiment, the resources for transmitting or receiving a PSFCH are determined according to the resources for receiving or transmitting the related PSCCH or PSSCH. Specifically, the resource position for transmitting or receiving a PSFCH can be determined by the resource position of the related PSCCH / PSSCH to be received or transmitted respectively, and, when there is repetition for PSCCH / PSSCH transmission as described in the above embodiment with details omitted, by the first / retransmission resource position of the related PSCCH / PSSCH.

[0078] In an embodiment, when the priority of the transmitted channel is the same as the priority of the received channel, the transmission priority is prioritized over reception. Note that the transmission and reception priorities with the same priority may be changed based on different configurations.

[0079] Similarly, as shown in FIG. 22, other specific examples of the communication flowchart between the transmitting user equipment and the receiving user equipment according to the embodiments of the present disclosure are provided. For example, the wireless communication method 2200 may be applied to the UE 300 as shown in FIG. 9.

[0080] As shown in FIG. 22, the wireless communication method 2200 starts at step S2201, and the UE 300 determines whether to receive the PSFCH or to transmit a competing channel (e.g., PSCCH / PSSCH / PSFCH) scheduled to be received simultaneously with the reception of the PSFCH based on the comparison between the priority of the PSFCH and the priority of the competing channel (e.g., PSCCH / PSSCH / PSFCH). Specifically, when there is a collision between the PSFCH transmission / reception and other channels, the UE 300 determines the process to be executed in advance. In the case of a collision in the time domain between the reception of the PSFCH and the transmission of other channels, e.g., PSCCH / PSSCH or PSFCH, the UE 300 determines whether to receive the PSFCH or to transmit a competing channel scheduled based on the comparison between the priority of the PSFCH and the priority of the competing channel before the collision time. When the UE 300 determines the process to be executed, in step S2202, the UE 300 can execute the reception of the PSFCH or the transmission of the competing channel based on the determination.

[0081] According to the above procedure, the user equipment according to the present disclosure can determine the transmission and reception of the PSFCH to prevent collisions even without repetition of the PSFCH, thereby reducing the resource allocation for the PSFCH.

[0082] In an embodiment, the priority of the PSFCH is determined based on the priority of the related PSCCH or PSSCH, e.g., the priority 1 shown in the figure. For example, in the above embodiment, the priority of the transmitted PSFCH is determined based on the priority of the related PSCCH or PSSCH received by the UE 300, and the priority of the received PSFCH is determined based on the priority of the related PSCCH or PSSCH transmitted from the UE 300.

[0083] In the embodiment, the resources for transmitting or receiving the PSFCH are determined according to the resources for receiving or transmitting the related PSCCH or PSSCH. Specifically, the resource position for transmitting or receiving the PSFCH can be determined by the resource position of the related PSCCH / PSSCH to be received or transmitted respectively, and when there is a repetition for PSCCH / PSSCH transmission as described in the above embodiment with details omitted, by the first / retransmission resource position of the related PSCCH / PSSCH.

[0084] In the embodiment, when the priority of the transmitted channel is the same as that of the received channel, the transmission priority is higher than the reception. It should be noted that the transmission and reception priorities with the same priority may be changed based on different configurations.

[0085] FIG. 23 shows another specific example of a flowchart of communication between a transmitting user device and a receiving user device according to an embodiment of the present disclosure. For example, the wireless communication method 2300 may be applied to the UE100 as shown in FIG. 5a.

[0086] In particular, a specific example of a flowchart of a communication method between any one of the UE100 in FIG. 5a or the vehicles 101, 102, and 103 according to an embodiment of the present disclosure and another UE400 is shown. Here, the UE400 can have the same configuration as the UE100.

[0087] As shown in FIG. 23, the wireless communication method 2200 starts at step S2301, and the UE100 can transmit a PSCCH or a PSSCH to the target UE. In response to this, at step S2302, the UE100 receives a PSFCH, where the PSFCH is allocated in the same resource pool as the PSCCH / PSSCH. In the embodiment, the PSFCH is allocated in a symbol located at the end of the slot of the resource pool. According to the above procedure, the notification of the resource position of the PSFCH can be omitted, and the resource overhead is optimized.

[0088] In an embodiment, the number of symbols in a slot of the resource pool for PSFCH is not more than that for PSCCH or PSSCH. In an embodiment, the number of symbols in a slot of the resource pool for PSFCH is based on the number for PSCCH or PSSCH. For example, the number of symbols in a slot of the resource pool for PSFCH is 1, while the number of symbols in a slot of the resource pool for PSCCH or PSSCH is 2 (i.e., proportional). According to the above procedure, the setting process of PSFCH resources can be simplified.

[0089] FIG. 24 systematically shows a specific example of a user device according to an embodiment of the present disclosure. As shown in FIG. 24, the UE 100 includes an encoder 2401, a modulator 2402, a resource mapper 2403, a resource multiplexer 2404, a first signal processor 2405, a transmitter 2406, an antenna 2407, a receiver 2408, a second signal processor 2409, a resource demultiplexer 2410, a resource demapper 2411, a demodulator 2412, a decoder 2413, and a circuit 2414.

[0090] For example, the encoder 2401 executes an encoding process on the transmission data, the modulator 2402 executes a modulation process on the encoded transmission data to generate data symbols. The resource mapper 2403 maps the sidelink data symbols to physical resources. The resource multiplexer 2404 multiplexes the data symbols and possible control information and / or synchronization information. The first signal processor 2405 executes signal processing on the multiplexed signal output from the resource multiplexer 2404. Here, the encoding, modulation, mapping, multiplexing, and signal processing processes respectively executed by the encoder 2401, the modulator 2402, the resource mapper 2403, the resource multiplexer 2404, and the first signal processor 2405 are under the control of the circuit 2414, and this control at least partially follows the reception of PSCCH / PSSCH as will be described later. The transmitter 2406 transmits the processed sidelink signal (e.g., PSCCH, PSSCH, and / or PSFCH) via the antenna 2407 to, for example, other UEs.

[0091] Furthermore, the receiver 2408 may receive sidelink signals (e.g., PSCCH, PSSCH, and / or PSFCH) from other UEs via the antenna 2407. The second signal processor 2409 performs signal processing on the sidelink signals received by the receiver 2408. The resource demultiplexer 2410 demultiplexes the processed sidelink signals into sidelink data and possible sidelink control information and / or synchronization information. The resource demapper 2411 demaps sidelink data symbols and possible sidelink control information and / or synchronization information from physical resources. The demodulator 2412 performs demodulation processing on the sidelink data symbols, and the decoder 2413 performs decoding processing on the demodulated sidelink data symbols to obtain received data. Also, the demodulator 2412 performs demodulation processing on possible sidelink control information and / or synchronization information, and the decoder 2413 performs decoding processing on the demodulated sidelink control information and / or synchronization information to output sidelink control information and / or synchronization information for controlling sidelink transmission and reception. For example, when the PSCCH / PSSCH is received by the receiver 2408, after the PSCCH / PSSCH is signal processed, demultiplexed, demapped, demodulated, and decoded, resource position information, gap information between the first transmission and retransmission, etc. are fed back to the circuit 2414 for controlling the encoder 2401, modulator 2402, resource mapper 2403, resource multiplexer, and the first signal processor 2405 for PSFCH transmission.

[0092] As described above, the above case may correspond to the case of an unlicensed carrier without Uu communication, but the present disclosure is not limited thereto. In the case of a licensed carrier, the UE 2400 may transmit an uplink signal to a base station (e.g., BS200 shown in FIG. 1) via the encoder 2401, modulator 2402, resource mapper 2403, resource multiplexer 2404, first signal processor 2405, transmitter 2406, and antenna 2407.

[0093] Figure 25 systematically shows another embodiment of a user equipment according to an embodiment of the present disclosure. As shown in Figure 25, the UE 300 includes an encoder 2501, a modulator 2502, a resource mapper 2503, a resource multiplexer 2504, a first signal processor 2505, a transceiver 2506, an antenna 2507, a second signal processor 2509, a resource demultiplexer 2510, a resource demapper 2511, a demodulator 2512, a decoder 2513, and a circuit 2508.

[0094] For example, the encoder 2501 performs an encoding process on the transmission data, the modulator 2502 performs a modulation process on the encoded transmission data, and generates data symbols. The resource mapper 2503 maps the sidelink data symbols to physical resources. The resource multiplexer 2504 multiplexes the data symbols and possible control information and / or synchronization information. The first signal processor 2505 performs signal processing on the multiplexed signal output from the resource multiplexer 2504. The transceiver 2506 transmits the processed sidelink signal (e.g., PSCCH, PSSCH, and / or PSFCH), or transmits and receives the processed sidelink signal (e.g., PSCCH, PSSCH, and / or PSFCH) to / from another UE via, for example, the antenna 2507.

[0095] Furthermore, the circuit 2508 may determine whether to transmit / receive the PSFCH or receive / transmit a contention channel (e.g., PSCCH, PSSCH, and / or PSFCH) based on the priorities received from the transmission data and the received data by controlling the encoding, modulation, mapping, multiplexing, and signal processing processes respectively performed by the encoder 2501, the modulator 2502, the resource mapper 2503, the resource multiplexer 2504, and the first signal processor 2505, so that the transceiver 2506 can perform corresponding operations.

[0096] Furthermore, the second signal processor 2509 performs signal processing on the sidelink signals received by the transceiver 2506. The resource demultiplexer 2510 demultiplexes the processed sidelink signals into sidelink data and possible sidelink control information and / or synchronization information. The resource demapper 2511 demaps sidelink data symbols and possible sidelink control information and / or synchronization information from physical resources. The demodulator 2512 performs demodulation processing on the sidelink data symbols, and the decoder 2513 performs decoding processing on the demodulated sidelink data symbols to obtain received data. Also, the demodulator 2512 also performs demodulation processing on possible sidelink control information and / or synchronization information, and the decoder 2513 performs decoding processing on the demodulated sidelink control information and / or synchronization information to output sidelink control information and / or synchronization information for controlling sidelink transmission and reception.

[0097] The above case may correspond to the case of an unlicensed carrier without Uu communication as described above, but the present disclosure is not limited thereto. In the case of a licensed carrier, the UE 2500 may transmit an uplink signal to a base station (e.g., BS 200 shown in FIG. 1) via the encoder 2501, modulator 2502, resource mapper 2503, resource multiplexer 2504, first signal processor 2505, transceiver 2506, and antenna 2507.

[0098] The present disclosure can be implemented by software, hardware, or software cooperating with hardware. Each functional block used in the description of each of the above-described embodiments can be partially or entirely realized by an LSI such as an integrated circuit, and each process described in each embodiment may be partially or entirely controlled by the same LSI or a combination of LSIs. The LSI may be formed individually as a chip, or alternatively, one chip may be formed to include some or all of the functional blocks. The LSI may include data input / outputs coupled thereto. Here, the LSI may be referred to as an IC, a system LSI, a super LSI, or an ultra LSI depending on the difference in integration level. However, the technology for realizing the integrated circuit is not limited to the LSI, and it may be realized using an application-specific circuit, a general-purpose processor, or a dedicated processor. Further, a field programmable gate array (FPGA) that can be programmed after the manufacture of the LSI, or a reconfigurable processor in which the connection and setting of circuit cells arranged inside the LSI can be reconfigured may be used. The present disclosure can be realized as digital processing or analog processing. As a result of the progress of semiconductor technology and other derivative technologies, if future integrated circuit technology replaces the LSI, functional blocks can be integrated using the future integrated circuit technology. Biotechnology can also be applied.

[0099] The present disclosure can be implemented by any type of device, apparatus, or system having a communication function, which is referred to as a communication device.

[0100] Some non-limiting specific examples of such communication devices include telephones (e.g., cellular (cell) phones, smartphones), tablets, personal computers (PCs) (e.g., laptops, desktops, netbooks), cameras (e.g., digital still / video cameras), digital players (digital audio / video players), wearable devices (e.g., wearable cameras, smartwatches, tracking devices), game consoles, digital book readers, remote health / telemedicine devices, and vehicles (e.g., automobiles, airplanes, ships) that provide communication functions, as well as various combinations thereof.

[0101] The communication device is not limited to being portable or mobile, and may include any type of non-portable or fixed device, apparatus, or system, such as smart home devices (e.g., home appliances, lighting, smart meters, control panels), vending machines, and any other "things" in the network of the "Internet of Things (IoT)".

[0102] Communication may include, for example, exchanging data via a cellular system, a wireless LAN system, a satellite system, etc., and various combinations thereof.

[0103] The communication device may also include a device such as a control device or a sensor coupled to a communication device that executes the communication functions described in the present disclosure. For example, the communication device may include a control device or a sensor that generates a control signal or a data signal used by a communication device that executes the communication function of the communication device.

[0104] The communication device may also include infrastructure facilities such as base stations, access points, and any other device, apparatus, or system that communicates or controls with a device such as those in the above non-limiting specific examples.

[0105] The embodiments of the present disclosure can at least provide the following subject matters.

[0106] (1) A transmitter operable to transmit a Physical Sidelink Control Channel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH), and a receiver operable to receive a Physical Sidelink Feedback Channel (PSFCH) associated with the transmitted PSCCH or PSSCH in a resource determined at least partially according to the resource for transmitting the PSCCH or PSSCH. A user equipment having the above.

[0107] (2) The resource in the time domain for the PSFCH is within a gap of one or more symbols or slots from the resource in the time domain for the associated PSCCH or PSSCH, the resource in the frequency domain for the PSFCH is within a gap of one or more Physical Resource Blocks (PRBs) from the resource in the frequency domain for the associated PSCCH or PSSCH, the number of the symbols or slots is preset, set or specified, or a combination of any of these, the number of the PRBs is preset, set or specified, or a combination of any of these. The user equipment according to (1).

[0108] (3) The PSFCH and the PSCCH or PSSCH are repeatedly transmitted, the number of repetitions of the PSFCH is in the same or a derived relationship as that of the associated PSCCH or PSSCH. The user equipment according to (1) or (2).

[0109] (4) At least one of the starting slot of the resource and the Physical Resource Block (PRB) for the first transmission of the PSFCH is notified by the Sidelink Control Indicator (SCI) received by the user equipment, and is the user equipment described in (3).

[0110] (5) At least one of the starting slot of the resource and the Physical Resource Block (PRB) for the first transmission of the PSFCH is determined by the resource position of the first transmission of the related PSCCH or PSSCH, and is the user equipment described in (3).

[0111] (6) At least one of the starting slot of the resource and the Physical Resource Block (PRB) for the first transmission of the PSFCH is determined by the resource position of the retransmission of the related PSCCH or PSSCH, and is the user equipment described in (3).

[0112] (7) The timing gap between the PSFCH and its repetition is the same as the timing gap between the related PSCCH or PSSCH and its repetition, and is the user equipment described in any one of (3) to (5).

[0113] (8) The frequency gap between the transmission of the PSFCH and its repetition is the same as the frequency gap between the related PSCCH or PSSCH and its repetition, and is the user equipment described in any one of (3) to (5).

[0114] (9) A transceiver capable of operating to transmit a first Physical Sidelink Feedback Channel (PSFCH) related to the received Physical Sidelink Control Channel (PSCCH) or Physical Sidelink Shared Channel (PSSCH), or to receive a second PSFCH related to the transmitted PSCCH or PSSCH. Based on the comparison between the priority of the first PSFCH and the priority of the first competing channel, determine whether to transmit the first PSFCH, or receive the first competing channel that is scheduled to be received simultaneously with the transmission of the first PSFCH, or a circuit operable to determine whether to receive the second PSFCH or transmit the second competing channel that is scheduled to arrive simultaneously with the reception of the second PSFCH based on the comparison between the priority of the second PSFCH and the priority of the second competing channel; A user equipment having the above.

[0115] (10) The user equipment according to (9), wherein there is no repetition of the transmission of the PSFCH.

[0116] (11) The priority of the transmitted channel is determined based on the channel level, The priority of the received channel is determined based on the resource pool level. The user equipment according to (9) or (10).

[0117] (12) The priority of the first PSFCH is determined based on the priority of the related received PSCCH or PSSCH, or The priority of the second PSFCH is determined based on the priority of the related transmitted PSCCH or PSSCH. The user equipment according to (9).

[0118] (13) When the priority of the transmitted channel is the same as that of the received channel, transmission takes precedence over reception. The user equipment according to (9) or (10).

[0119] (14) The resources for transmitting the first PSFCH or receiving the second PSFCH are determined according to the resources for receiving or transmitting the related PSCCH or PSSCH. The user equipment according to (9) or (10).

[0120] (15)A transmitter operable to transmit a Physical Sidelink Control Channel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH), a receiver operable to receive a Physical Sidelink Feedback Channel (PSFCH), and having, wherein the PSFCH is allocated in the same resource pool as that of the PSCCH or PSSCH, a user equipment.

[0121] (16)The user equipment according to (15), wherein the PSFCH is allocated in one or more symbols located at the end of a slot of the resource pool.

[0122] (17)The user equipment according to (15) or (16), wherein the number of symbols in a slot of the resource pool for the PSFCH is not more than that of the PSCCH or PSSCH.

[0123] (18)Transmitting a Physical Sidelink Control Channel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH), receiving, in a resource determined at least partially according to the resource for transmitting the PSCCH or PSSCH, a Physical Sidelink Feedback Channel (PSFCH) related to the transmitted PSCCH or PSSCH, and having, a wireless communication method for a user equipment.

[0124] (19)The resource in the time domain for the PSFCH is within a gap of one or more symbols or slots from the resource in the time domain for the related PSCCH or PSSCH, The resource in the frequency domain for the PSFCH is within the gap of one or more Physical Resource Blocks (PRBs) from the resource in the frequency domain for the associated PSCCH or PSSCH, The number of the symbols or slots is preset, set or specified, or any combination thereof, The number of the PRBs is preset, set or specified, or any combination thereof, the wireless communication method according to (18).

[0125] (20) The PSFCH and the PSCCH or PSSCH are repeatedly transmitted, The number of repetitions of the PSFCH is in the same or derived relationship as that of the associated PSCCH or PSSCH, the wireless communication method according to (18) or (19).

[0126] (21) At least one of the start slot and the Physical Resource Block (PRB) of the resource for the first transmission of the PSFCH is notified by a Sidelink Control Indicator (SCI) received by the user equipment, the wireless communication method according to (20).

[0127] (22) At least one of the start slot and the Physical Resource Block (PRB) of the resource for the first transmission of the PSFCH is determined by the resource position of the first transmission of the associated PSCCH or PSSCH, the wireless communication method according to (20).

[0128] (23) At least one of the start slot and the Physical Resource Block (PRB) of the resource for the first transmission of the PSFCH is determined by the resource position of the retransmission of the associated PSCCH or PSSCH, the wireless communication method according to (20).

[0129] (24) The timing gap between the PSFCH and its repetition is the same as the timing gap between the associated PSCCH or PSSCH and its repetition, the wireless communication method according to any one of (20) to (22).

[0130] (25) The frequency gap between the transmission of the PSFCH and its repetition is the same as the frequency gap between the associated PSCCH or PSSCH and its repetition, the wireless communication method according to any one of (20) to (22).

[0131] (26) Based on the comparison between the priority of the first Physical Sidelink Feedback Channel (PSFCH) and the priority of the first contention channel, determine whether to transmit the first PSFCH associated with the received Physical Sidelink Control Channel (PSCCH) or Physical Sidelink Shared Channel (PSSCH), or receive the first contention channel scheduled to be received simultaneously with the transmission of the first PSFCH. Based on the determination, determine whether to transmit the first PSFCH, or receive the first contention channel, or Based on the comparison between the priority of the second PSFCH and the priority of the second contention channel, determine whether to receive the second PSFCH associated with the transmitted PSCCH or PSSCH, or transmit the second contention channel scheduled to arrive simultaneously with the reception of the second PSFCH. Based on the determination, determine whether to receive the second PSFCH, or transmit the second contention channel, A wireless communication method for a user equipment having.

[0132] (27) There is no repetition of the transmission of the PSFCH, the wireless communication method according to (26).

[0133] (28) The priority of the transmitted channel is determined based on the channel level, The priority of the received channel is determined based on the resource pool level, the wireless communication method described in (26) or (27).

[0134] (29) The priority of the first PSFCH is determined based on the priority of the related received PSCCH or PSSCH, or The priority of the second PSFCH is determined based on the priority of the related transmitted PSCCH or PSSCH, the wireless communication method described in (26).

[0135] (30) When the priority of the transmitted channel is the same as that of the received channel, transmission is prioritized over reception, the wireless communication method described in (26) or (27).

[0136] (31) The resources for transmitting the first PSFCH or receiving the second PSFCH are determined according to the resources for receiving or transmitting the related PSCCH or PSSCH, the wireless communication method described in (26) or (27).

[0137] (32) Transmitting a Physical Sidelink Control Channel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH), Receiving a Physical Sidelink Feedback Channel (PSFCH), having, The PSFCH is allocated in the same resource pool as the PSCCH or PSSCH, a wireless communication method for a user equipment.

[0138] (33) The PSFCH is allocated in one or more symbols located at the end of the slot of the resource pool, the wireless communication method described in (32).

[0139] (34) The number of symbols in the slot of the resource pool for the PSFCH is not more than that for the PSCCH or PSSCH, the wireless communication method according to (32) or (33).

Claims

1. A communication device, A receiver that receives a Physical Sidelink Control Channel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH); a transmitter for transmitting a Physical Sidelink Feedback Channel (PSFCH) associated with the received PSCCH or PSSCH on resources determined at least in part according to resources for receiving the PSCCH or PSSCH; having The association relationship between the PSCCH or the PSSCH and the PSFCH is set based on a User Equipment Identifier (UE ID), The priority of the PSFCH is determined based on the priority of the associated PSCCH or PSSCH, and the transmitter compares the priority of the PSFCH with the priority of other PSFCHs scheduled to be received or transmitted simultaneously, and determines whether to transmit the PSFCH. Communications equipment.

2. the resources in the time domain for the PSFCH are within a gap of one or more symbols or slots from the resources in the time domain for the associated PSCCH or PSSCH; The resource in the frequency domain for the PSFCH is within a gap of one or more Physical Resource Blocks (PRBs) from the resource in the frequency domain for the associated PSCCH or PSSCH; the number of symbols or slots is pre-defined, set, or specified, or any combination thereof; The number of PRBs is pre-configured, configured, or specified, or any combination thereof. The communication device according to claim 1 .

3. The PSFCH and the PSCCH or the PSSCH are repeatedly received, The number of repetitions of the PSFCH is the same as or has a derived relationship to that of the associated PSCCH or PSSCH.

3. A communication device according to claim 1 or 2.

4. At least one of a start slot and a Physical Resource Block (PRB) of resources for the initial reception of the PSFCH is notified by a Sidelink Control Indicator (SCI) transmitted by the communication device; The communication device according to claim 3.

5. At least one of a starting slot and a Physical Resource Block (PRB) of the resource for the first reception of the PSFCH is determined by a resource location of the first reception of the associated PSCCH or PSSCH; The communication device according to claim 3.

6. At least one of a starting slot and a Physical Resource Block (PRB) of resources for the initial reception of the PSFCH is determined by a resource location of a retransmission of the associated PSCCH or PSSCH; The communication device according to claim 3.

7. the timing gap between the PSFCH and its repetitions is the same as the timing gap between the associated PSCCH or PSSCH and its repetitions. A communication device according to any one of claims 3 to 5.

8. the frequency gap between reception of the PSFCH and its repetition is the same as the frequency gap between the associated PSCCH or PSSCH and its repetition. A communication device according to any one of claims 3 to 6.

9. 1. A wireless communication method for a communication device, comprising: Receiving a Physical Sidelink Control Channel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH); transmitting a Physical Sidelink Feedback Channel (PSFCH) associated with the received PSCCH or PSSCH on resources determined at least in part according to resources for receiving the PSCCH or PSSCH; having The association relationship between the PSCCH or the PSSCH and the PSFCH is set based on a User Equipment Identifier (UE ID), The priority of the PSFCH is determined based on the priority of the associated PSCCH or PSSCH, and the priority of the PSFCH is compared with the priority of other PSFCHs scheduled to be received or transmitted simultaneously, to determine whether to transmit the PSFCH; A wireless communication method for a communication device.

10. An integrated circuit for a communications device, A process of receiving a Physical Sidelink Control Channel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH); transmitting a Physical Sidelink Feedback Channel (PSFCH) associated with the received PSCCH or PSSCH on resources determined at least in part according to resources for receiving the PSCCH or PSSCH; Control the The association relationship between the PSCCH or the PSSCH and the PSFCH is set based on a User Equipment Identifier (UE ID), The priority of the PSFCH is determined based on the priority of the associated PSCCH or PSSCH, and the priority of the PSFCH is compared with the priority of other PSFCHs scheduled to be received or transmitted simultaneously, to determine whether to transmit the PSFCH; Integrated circuits for communications devices.

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