Feedback resource determination method and apparatus, computer-readable storage medium

Abstract

The application provides a feedback resource determination method and device, and a computer readable storage medium. The feedback resource determination method comprises: an access network device sending first indication information, and a receiving end user equipment receiving the first indication information and performing HARQ feedback on sidelink data transmission on transmission resources of multiple component carriers by using multiple PRBs according to the first indication information. The first indication information is used to indicate the multiple PRBs on a target PSFCH symbol. The multiple PRBs are used to perform HARQ feedback on sidelink data transmission on transmission resources of multiple component carriers. The target PSFCH symbol is an OFDM symbol on a first component carrier in the multiple component carriers. The above scheme can use a PSFCH symbol on one component carrier to transmit HARQ feedback corresponding to multiple component carriers, so that all component carriers can perform HARQ feedback.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to a method and apparatus for determining feedback resources, and a computer-readable storage medium. Background Technology

[0002] With the development of the 3rd Generation Partnership Project (3GPP), 5G mobile communication technology (5G5) is emerging. th Standardization efforts for Vehicle-to-Everything (V2X) communication technology within the 5G New Radio (NR) era are progressing steadily. NR V2X, as an enhancement to Long Term Evolution (LTE) V2X technology, is a key technological means enabling vehicular networks.

[0003] To enable NR V2X to support services with larger data volumes, Carrier Aggregation (CA) has been listed as an important research technology for NR V2X enhancement in 3GPP Rel-18, so as to enable User Equipment (UE) to obtain greater service bandwidth and higher transmission rates.

[0004] Compared to LTE V2X, NR V2X introduces a feedback mechanism in both unicast and multicast to improve the reliability of sidelink (SL) communication. This mechanism is called Hybrid Automatic Repeat reQuest (HARQ). HARQ feedback is carried by the Physical Sidelink Feedback Channel (PSFCH). The sending UE can receive HARQ information on the corresponding PSFCH according to defined implicit mapping rules and decide whether to retransmit.

[0005] Currently, the HARQ feedback mechanism in CA scenarios may prevent some component carriers from performing HARQ feedback. Summary of the Invention

[0006] The embodiments of this application address the technical problem that some component carriers cannot perform HARQ feedback in NR V2X CA scenarios.

[0007] To address the aforementioned technical problems, this application provides the following technical solutions:

[0008] In a first aspect, a feedback resource determination method is provided, comprising: sending first indication information, the first indication information being used to indicate multiple PRBs, the multiple PRBs being multiple PRBs on a target PSFCH symbol, the multiple PRBs being used to perform HARQ feedback on side-line data transmission on transmission resources of multiple component carriers, and the target PSFCH symbol being an OFDM symbol on a first component carrier among the multiple component carriers.

[0009] Optionally, the PRBs used for HARQ feedback corresponding to different component carriers do not overlap.

[0010] Optionally, the number of PRBs for HARQ feedback corresponding to each transmission resource on each component carrier is N / M, where N is the number of multiple PRBs and M is the total number of transmission resources using the target PSFCH symbol for HARQ feedback on multiple component carriers; the transmission resource occupies one time slot in the time domain and one sub-channel in the frequency domain.

[0011] Optionally, the first indication information includes at least one PRB set parameter, which is used to indicate multiple PRBs.

[0012] Optionally, at least one PRB set parameter is a plurality of PRB set parameters corresponding one-to-one with a plurality of component carriers, and the PRB set parameter corresponding to a component carrier is used to indicate the PRB for HARQ feedback corresponding to that component carrier.

[0013] Optionally, the PRB set parameter is configured in bitmap form, and the number of bits contained in the PRB set parameter is equal to the number of PRBs on the target PSFCH symbol.

[0014] Optionally, if the first sub-channel width cannot make the ratio of the number of multiple PRBs to the number of transmission resources on multiple component carriers a positive integer, the method further includes: sending second indication information, the second indication information being used to indicate the second sub-channel width of the resource pool used for the current communication, the second sub-channel width being able to make the ratio of the number of multiple PRBs to the number of transmission resources on multiple component carriers a positive integer; the first sub-channel width being the sub-channel width of the resource pool configured before configuring the second sub-channel width of the resource pool.

[0015] Optionally, the target PSFCH symbol includes multiple PSFCH symbols, and the method further includes: sending third indication information, the third indication information being used to indicate the target PSFCH symbol.

[0016] Optionally, the third indication information is used to indicate the time-domain offset corresponding to each of the multiple component carriers. The time-domain offset corresponding to a component carrier is used to determine the time slot in which the PSFCH symbol for HARQ feedback is located.

[0017] Optionally, the target PSFCH symbol includes two PSFCH symbols.

[0018] Secondly, a method for determining feedback resources is provided, including:

[0019] Receive first indication information, the first indication information is used to indicate multiple physical resource blocks (PRBs), the multiple PRBs are multiple PRBs on the target physical direct link feedback channel (PSFCH) symbol, the multiple PRBs are used to perform hybrid automatic repeat request (HARQ) feedback for side-line data transmission on the transmission resources of multiple component carriers, and the target PSFCH symbol is an orthogonal frequency division multiplexing (OFDM) symbol on the first component carrier among the multiple component carriers.

[0020] According to the first instruction information, multiple PRBs are used to perform HARQ feedback on sideline data transmission on the transmission resources of multiple component carriers; or, according to the first instruction information, multiple PRBs are used to receive HARQ feedback corresponding to sideline data transmission on the transmission resources of multiple component carriers.

[0021] Optionally, before performing HARQ feedback on sideline data transmission on transmission resources of multiple component carriers using multiple PRBs, or before receiving HARQ feedback corresponding to sideline data transmission on transmission resources of multiple component carriers using multiple PRBs, the method further includes: mapping transmission resources on multiple component carriers to PRBs used for HARQ feedback on the target PSFCH symbol according to the first indication information.

[0022] Optionally, according to the first indication information, mapping the transmission resources on multiple component carriers to the PRBs used for HARQ feedback on the target PSFCH symbol includes: mapping the transmission resources on multiple component carriers to the PRBs used for HARQ feedback on the target PSFCH symbol according to the first indication information and a predetermined mapping rule.

[0023] Optionally, the predetermined mapping rule is: the larger the sub-channel index, the larger the corresponding PRB index; for transmission resources with the same sub-channel index, the smaller the time slot index, the smaller the corresponding PRB index.

[0024] Optionally, the first indication information includes at least one PRB set parameter, which is used to indicate multiple PRBs.

[0025] Optionally, at least one PRB set parameter is a plurality of PRB set parameters corresponding one-to-one with a plurality of component carriers, and the PRB set parameter corresponding to a component carrier is used to indicate the PRB for HARQ feedback corresponding to that component carrier.

[0026] Optionally, the PRB set parameter is configured in bitmap form, and the number of bits contained in the PRB set parameter is equal to the number of PRBs on the target PSFCH symbol.

[0027] Optionally, the number of PRBs for HARQ feedback corresponding to each transmission resource on each component carrier is N / M, where N is the number of multiple PRBs and M is the total number of transmission resources using the target PSFCH symbol for HARQ feedback on multiple component carriers; the transmission resource occupies one time slot in the time domain and one sub-channel in the frequency domain.

[0028] Optionally, if the first sub-channel width cannot make the ratio of the number of multiple PRBs to the number of transmission resources on multiple component carriers a positive integer, the method further includes: receiving second indication information, the second indication information being used to indicate a second sub-channel width for the resource pool used for the current communication, the second sub-channel width being able to make the ratio of the number of multiple PRBs to the number of transmission resources on multiple component carriers a positive integer; the first sub-channel width being the sub-channel width of the resource pool configured for the receiving end user equipment before configuring the second sub-channel width of the resource pool; and determining the width of the sub-channel of the resource pool as the second sub-channel width according to the second indication information.

[0029] Optionally, the target PSFCH symbol includes multiple PSFCH symbols, and the method further includes: receiving third indication information, the third indication information being used to indicate the target PSFCH symbol; and determining, based on the third indication information, the PSFCH symbols corresponding to multiple component carriers for HARQ feedback for sideline data transmission.

[0030] Optionally, the third indication information is used to indicate the time-domain offset corresponding to each of the multiple component carriers. The time-domain offset corresponding to a component carrier is used to determine the time slot in which the PSFCH symbol for HARQ feedback is located.

[0031] Optionally, the target PSFCH symbol includes two PSFCH symbols.

[0032] Thirdly, a method for determining feedback resources is provided, including:

[0033] Send a fourth indication message, which is used to indicate multiple PSFCH symbols. The PRBs on the multiple PSFCH symbols are used to perform HARQ feedback on the sideline data transmission on the transmission resources of X component carriers. The multiple PSFCH symbols are OFDM symbols on the first component carrier among the X component carriers, where X is an integer greater than 1.

[0034] Optionally, multiple PSFCH symbols can be converted into two PSFCH symbols.

[0035] Optionally, the fourth indication information is used to indicate the time domain offset corresponding to each of the multiple component carriers. The time domain offset corresponding to a component carrier is used to determine the time slot where the PSFCH symbol for HARQ feedback is located.

[0036] Optionally, the fourth indication information is used to indicate X PSFCH symbols located in the same time slot, with each of the X PSFCH symbols corresponding to one of the X component carriers, and the X PSFCH symbols appearing periodically.

[0037] Fourthly, a method for determining feedback resources is provided, including:

[0038] Receive fourth indication information, which is used to indicate multiple PSFCH symbols. The PRB on the multiple PSFCH symbols is used to perform HARQ feedback on the sideline data transmission on the transmission resources of X component carriers. The multiple PSFCH symbols are OFDM symbols on the first component carrier among the X component carriers, where X is an integer greater than 1.

[0039] HARQ feedback for sideline data transmission is performed based on the PRBs on the PSFCH symbols corresponding to X component carriers; or, based on the fourth indication information, HARQ feedback for sideline data transmission on the transmission resources of X CCs is received using the PRBs on the PSFCH symbols corresponding to X CCs; wherein, the PSFCH symbols corresponding to X component carriers are determined according to the fourth indication information.

[0040] Optionally, multiple PSFCH symbols can be converted into two PSFCH symbols.

[0041] Optionally, the fourth indication information is used to indicate the time domain offset corresponding to each of the multiple component carriers. The time domain offset corresponding to a component carrier is used to determine the time slot where the PSFCH symbol for HARQ feedback is located.

[0042] Optionally, the fourth indication information is used to indicate X PSFCH symbols located in the same time slot, with each of the X PSFCH symbols corresponding to one of the X component carriers, and the X PSFCH symbols appearing periodically.

[0043] Fifthly, a feedback resource determination apparatus is provided, comprising: a functional unit for performing any of the methods provided in the first aspect. For example, the functional unit includes: a transmitting unit for transmitting first indication information, the first indication information indicating a plurality of PRBs, the plurality of PRBs being a plurality of PRBs on a target PSFCH symbol, the plurality of PRBs being used for HARQ feedback of side-row data transmission on transmission resources of a plurality of component carriers, the target PSFCH symbol being an OFDM symbol on a first component carrier among the plurality of component carriers.

[0044] A sixth aspect provides a feedback resource determination apparatus, comprising: a functional unit for performing any of the methods provided in the second aspect. For example, the functional unit includes: a receiving unit for receiving first indication information, the first indication information indicating a plurality of PRBs, the plurality of PRBs being a plurality of PRBs on a target PSFCH symbol, the plurality of PRBs being used for HARQ feedback of side-line data transmission on transmission resources of a plurality of component carriers, the target PSFCH symbol being an OFDM symbol on a first component carrier among the plurality of component carriers; and a processing unit for performing HARQ feedback of side-line data transmission on transmission resources of the plurality of component carriers using the plurality of PRBs according to the first indication information.

[0045] In a seventh aspect, a feedback resource determination apparatus is provided, comprising: a functional unit for performing any of the methods provided in the third aspect.

[0046] Eighthly, a feedback resource determination apparatus is provided, comprising: a functional unit for performing any of the methods provided in the fourth aspect.

[0047] A ninth aspect provides a feedback resource determination apparatus, comprising: a memory and a processor, wherein the memory stores a computer program executable on the processor, and the processor, when executing the computer program, performs the steps of any method provided in any of the first to fourth aspects described above.

[0048] In a tenth aspect, a computer-readable storage medium is provided, which is a non-volatile or non-transient storage medium, having stored thereon a computer program that, when executed by a processor, causes the steps of any method provided in any of the first to fourth aspects to be performed.

[0049] Eleventhly, a computer program product is provided, the computer program product comprising a computer program that, when run on a computer, causes the computer to perform the steps of any method provided by any one of the first to fourth aspects.

[0050] In a twelfth aspect, a communication system is provided, comprising an access network device for performing any one of the methods provided in the first or third aspect, and a receiving user equipment for performing any one of the methods provided in the second or fourth aspect.

[0051] Compared with the prior art, the technical solution of this application embodiment has the following beneficial effects:

[0052] The method provided in this application, in a CA scenario using a sidelink, performs HARQ feedback on sidelink data transmission on multiple component carriers through one of the component carriers used for CA, achieving the following effects:

[0053] 1. It enables CCs that do not support HARQ feedback (e.g., CCs without a configured PSFCH symbol) to perform HARQ feedback, improving the reliability of CC transmission. For example, a CC without a configured PSFCH symbol can use a CC with a configured PSFCH symbol to perform HARQ feedback.

[0054] 2. Cross-CC feedback can save resources on other CCs besides the one used for HARQ feedback. For example, resources on other CCs that were originally used for HARQ feedback can be used to transmit other information, thus improving resource utilization efficiency.

[0055] 3. In application scenarios where data for the same service is transmitted through multiple carriers (CCs), cross-carrier feedback can effectively improve the data transmission rate of the service and reduce the time required for data transmission. In this transmission scenario, cross-carrier feedback helps the transmitting UE control retransmissions. For example, when the transmitting UE needs to both send information and receive HARQ feedback, it is possible that HARQ feedback will not be received on some CCs due to information transmission, thus increasing the number of retransmissions. This application addresses this by centralizing HARQ feedback on one CC, allowing the transmitting UE to receive HARQ feedback from all CCs simultaneously, thereby reducing the number of retransmissions. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of a communication scenario corresponding to one of the feedback resource determination methods in this application;

[0057] Figure 2 This is a flowchart of a feedback resource determination method according to an embodiment of this application;

[0058] Figure 3 This is a schematic diagram illustrating the mapping between a transmission resource and multiple PRBs in an embodiment of this application;

[0059] Figure 4This is a schematic diagram illustrating another mapping between transmission resources and multiple PRBs in an embodiment of this application;

[0060] Figure 5 This is another schematic diagram illustrating the mapping between transmission resources and multiple PRBs in an embodiment of this application;

[0061] Figure 6 This is another schematic diagram of the mapping between transmission resources and multiple PRBs in the embodiments of this application;

[0062] Figure 7 This is a schematic diagram showing the distribution of transmission resources on CC and the corresponding PSFCH symbol positions in an embodiment of this application;

[0063] Figure 8 This is a flowchart of another feedback resource determination method in the embodiments of this application;

[0064] Figure 9 This is a schematic diagram of the mapping between a HARQ feedback slot and a PSFCH symbol in an embodiment of this application;

[0065] Figure 10 This is a schematic diagram of the conventional time slot structure in existing protocols;

[0066] Figure 11 This is a schematic diagram of a time slot structure in an embodiment of this application;

[0067] Figure 12 This is a flowchart of another feedback resource determination method in the embodiments of this application;

[0068] Figure 13 This is a schematic diagram illustrating the mapping between a transmission resource and multiple PRBs in an embodiment of this application;

[0069] Figure 14 This is a schematic diagram of the structure of a feedback resource determination device according to an embodiment of this application;

[0070] Figure 15 This is a schematic diagram of another feedback resource determination device in the embodiments of this application;

[0071] Figure 16 This is a schematic diagram of another feedback resource determination device in the embodiments of this application. Detailed Implementation

[0072] The feedback resource determination method provided in this application embodiment can be applied to, for example, Figure 1 In the communication scenario shown, the access network device can communicate with at least one UE via the Uu interface. Figure 1 The diagram is illustrated using an access network device communicating with two UEs, with the UEs being vehicles.

[0073] Understandably, in actual implementation, the number of UEs communicating with the access network equipment can be greater, and the number of UEs is not limited to a certain range. Figure 1 The vehicle shown is an example. The dashed line between the UE and the access network device indicates that the link may not actually exist, depending on the UE's state. If the UE is in RRC connected state, the access network device can send information to the UE via RRC signaling, such as the first indication information and the second indication information mentioned below. If the UE is in idle state or out of coverage of the access network device, the access network device cannot send information to the UE via RRC signaling. Between UEs (e.g., ... Figure 1 UE1 and UE2 can communicate through the PC5 interface. The link between UEs can be called a sidelink or PC5 link. The UE that sends information can be called the sending UE, and the UE that receives information can be called the receiving UE.

[0074] The UE described in this application embodiment is a device with wireless communication capabilities, and can also be referred to as a terminal, mobile station (MS), mobile terminal (MT), access terminal device, vehicle-mounted terminal device, industrial control terminal device, UE unit, UE station, mobile station, remote station, remote terminal device, mobile device, UE terminal device, wireless communication device, UE agent, or UE device, etc. The UE can be fixed or mobile. It should be noted that the UE can support at least one wireless communication technology, such as LTE, NR, etc. For example, a UE can be a mobile phone, tablet, desktop computer, laptop computer, all-in-one computer, vehicle terminal, virtual reality (VR) UE, augmented reality (AR) UE, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, wearable device, UE in future mobile communication networks, or UE in future evolved public land mobile network (PLMN), etc. In some embodiments of this application, the UE may also be a device with transceiver functionality, such as a chip system. The chip system may include a chip, and may also include other discrete components.

[0075] In the embodiments of this application, the access network device is a device that provides wireless communication functions for the UE, and can also be referred to as a radio access network (RAN) device or access network element. The access network device can support at least one wireless communication technology, such as LTE, NR, etc. For example, the access network device includes, but is not limited to: next-generation node B (gNB), evolved node B (eNB), radio network controller (RNC), node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home-evolved node B, or home node B (HNB)), baseband unit (BBU), transmitting and receiving point (TRP), transmitting point (TP), mobile switching center, etc. Network devices can also be radio controllers, centralized units (CUs), and / or distributed units (DUs) in cloud radio access network (CRAN) scenarios, or access network devices can be relay stations, access points, vehicle-mounted devices, terminal devices, wearable devices, and access network devices in future mobile communications or future evolved PLMNs. In some embodiments, access network devices can also be apparatuses that provide wireless communication functions for terminal devices, such as chip systems. For example, a chip system may include chips, and may also include other discrete devices.

[0076] In some embodiments, the access network device can also communicate with Internet Protocol (IP) networks, such as the Internet, private IP networks, or other data networks.

[0077] The method provided in this application can be applied not only to V2X CA scenarios, but also to any other CA scenarios with sidelink transmission, such as device-to-device (D2D) CA scenarios. This application makes no limitation on this.

[0078] To make the above-mentioned objectives, features and beneficial effects of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0079] As described in the background section above, in the prior art, each component carrier (CC) can only feed back its corresponding HARQ feedback information, which has certain limitations.

[0080] For example, if some control cells (CCs) are not configured with a PSFCH, these CCs cannot perform HARQ feedback. Furthermore, when each CC performs HARQ feedback independently, it requires independently allocating its own corresponding Orthogonal Frequency Division Multiplexing (OFDM) symbols to carry the HARQ feedback, resulting in wasted resources.

[0081] To address the aforementioned issues, this application provides a feedback resource determination method. The receiving UE can use the PSFCH symbol corresponding to the same CC to carry HARQ feedback for sideline data transmission of different CCs, thereby enabling all CCs to perform HARQ feedback and saving transmission resources on CCs other than those performing HARQ feedback.

[0082] In practical implementation, the feedback resource determination method provided in this application can be implemented in the frequency domain, the time domain, or a combination of the time and frequency domains. These three methods are described below.

[0083] Method 1: Implemented through the frequency domain.

[0084] See below for the method. Figure 2 The feedback resource determination method provided in this application includes:

[0085] S201, the access network device generates first indication information, which is used to indicate multiple physical resource blocks (PRBs). The multiple PRBs are multiple PRBs on the target PSFCH symbol. The multiple PRBs are used to perform HARQ feedback on side-by-side data transmission on the transmission resources of multiple CCs.

[0086] In this embodiment, a PSFCH symbol refers to an OFDM symbol that can be used for PSFCH feedback. The target PSFCH symbol can be an OFDM symbol on the first CC among a plurality of CCs. The first CC can be any CC among the plurality of CCs that has a PSFCH symbol. In this embodiment, a transmission resource occupies one time slot in the time domain and one sub-channel in the frequency domain.

[0087] In the embodiments of this application, the PRBs used for HARQ feedback corresponding to different CCs do not overlap. That is, multiple PRBs for HARQ feedback can exist on the target PSFCH symbol, and the PRBs corresponding to different CCs are different.

[0088] In this embodiment of the application, the first indication information may include at least one PRB set parameter, which may be used to indicate the above-mentioned multiple PRBs.

[0089] In one embodiment of this application, a PRB set parameter can be used to indicate the PRBs used for HARQ feedback corresponding to different CCs. In this case, the first indication information includes a PRB set parameter, which is used to indicate the PRBs used for HARQ feedback corresponding to multiple CCs.

[0090] In another embodiment of this application, different PRB set parameters can be used to indicate the PRBs used for HARQ feedback corresponding to different CCs. In this case, the first indication information includes PRB set parameters that correspond one-to-one with multiple CCs, and the PRB set parameters corresponding to a CC are used to indicate the PRB used for HARQ feedback corresponding to that CC. For example, if there are three CCs, the first indication information includes three PRB set parameters.

[0091] In one embodiment of this application, the PRB set parameters are configured in the form of a bitmap, and the number of bits corresponding to the PRB set parameters is equal to the number of PRBs on the target PSFCH symbol.

[0092] In this embodiment, the PRB set parameter can be the sl-PSFCH-RB-Set parameter in the existing protocol. The sl-PSFCH-RB-Set parameter is configured in bitmap form, where each bit corresponds one-to-one with a PRB in the target PSFCH symbol. When a bit is "1", it indicates that the corresponding PRB can be used for HARQ feedback; when a bit is "0", it indicates that the corresponding PRB cannot be used for HARQ feedback, and vice versa.

[0093] For example, assuming the target PSFCH symbol has 20 PRBs, then the number of bits corresponding to the PRB set parameter is 20. When a certain bit is "1", it indicates that the corresponding PRB can be used for HARQ feedback, and the sl-PSFCH-RB-Set parameter is 00110100110110101001. This means that PRB3, PRB4, PRB6, PRB9, PRB10, PRB12, PRB13, PRB15, PRB17, and PRB20 are used for HARQ feedback, while the remaining PRBs cannot be used for HARQ feedback. Here, PRBq refers to the PRB corresponding to the q-th bit from the beginning of the sl-PSFCH-RB-Set parameter, where q is a positive integer.

[0094] In the embodiments of this application, for the same CC, the number of PRBs used for HARQ feedback corresponding to different transport resources can be equal (e.g., for CC0, the number of PRBs used for HARQ feedback corresponding to each transport resource can be 1) or unequal (e.g., for CC0, the number of PRBs used for HARQ feedback corresponding to the first transport resource is 1, and the number of PRBs used for HARQ feedback corresponding to the second transport resource is 2). For different CCs, the number of PRBs used for HARQ feedback corresponding to different transport resources can be equal (e.g., for CC0 and CC1, the number of PRBs used for HARQ feedback corresponding to their transport resources can be 1) or unequal (e.g., for CC0, the number of PRBs used for HARQ feedback corresponding to each transport resource is 1, and for CC1, the number of PRBs used for HARQ feedback corresponding to each transport resource is 2).

[0095] If the number of PRBs used for HARQ feedback is the same for each transmission resource, then the number of PRBs used for HARQ feedback for each transmission resource on each CC is N / M, where N is the number of the multiple PRBs and M is the total number of transmission resources used for HARQ feedback on the multiple CCs using the target PSFCH symbol.

[0096] For example, the number of PRBs used for HARQ feedback on the target PSFCH symbol is 10. These 10 PRBs are used for HARQ feedback on sideline data transmission on the transmission resources of 3 CCs. Among them, the number of transmission resources on 2 CCs is 3 each, and the number of transmission resources on the other CC is 4. That is, the number of transmission resources on all CCs is 10. Then, the number of PRBs used for HARQ feedback for each transmission resource on each CC is 1.

[0097] In practice, the above-mentioned S201 may be an optional step.

[0098] S202, the access network device sends the first indication information. Correspondingly, both the receiving UE and the sending UE can receive the first indication information.

[0099] based on Figure 1 In the example shown, if the transmitting UE is UE1, then the receiving UE can be UE2. The actions performed by the receiving UE can be executed by a chip with data processing capabilities (such as a baseband chip) within the receiving UE, or by a chip module within the receiving UE that includes a chip with data processing capabilities. Correspondingly, the actions performed by the transmitting UE can be executed by a chip with data processing capabilities (such as a baseband chip) within the transmitting UE, or by a chip module within the transmitting UE that includes a chip with data processing capabilities.

[0100] S203, the receiving UE performs HARQ feedback on the sideline data transmission on the transmission resources of multiple CCs using multiple PRBs according to the first indication information. Correspondingly, the sending UE receives the HARQ feedback corresponding to the sideline data transmission on the transmission resources of multiple CCs using multiple PRBs according to the first indication information.

[0101] In practical implementation, after receiving the first indication information, both the receiving UE and the sending UE can receive the first indication information sent by the access network device and obtain multiple PRBs on the target PSFCH symbol. The time slots and PSFCH symbols where the multiple PRBs are located can be determined through information configured by higher layers. For each CC, the PSFCH symbol where the PRB used for HARQ feedback for that CC is located can appear periodically. The time slot where the PSFCH symbol is located can be determined by the higher layer parameter sl-MinTimeGapPSFCH.

[0102] As an optional embodiment, prior to S203, the feedback resource determination method may further include: the receiving UE mapping transmission resources on multiple CCs to PRBs used for HARQ feedback on a target PSFCH symbol according to first indication information. After mapping, the receiving UE can use the PRB corresponding to a CC to perform HARQ feedback for sideline data transmission on that CC.

[0103] Accordingly, the transmitting UE maps the transmission resources on multiple CCs to the PRBs used for HARQ feedback on the target PSFCH symbol according to the first indication information, so as to know on which PRBs to receive HARQ feedback for sideline data transmission on which CC. The specific mapping process between transmission resources and PRBs is similar to that of the receiving UE, and can be understood by referring to the following text, which will not be repeated here.

[0104] It should be noted that during mapping, the frequency domain subcarriers of multiple CCs currently used for communication can be regarded as the same logical resource pool. The resource pool in this application can also be called a transmission resource pool. For the transmitting UE, this resource pool is called the transmission resource pool; for the receiving UE, this resource pool can be called the reception resource pool. That is, for the same resource pool, the transmitting UE and the receiving UE are configured as the transmission resource pool and the reception resource pool, respectively.

[0105] In Method 1, the frequency domain allows the receiving UE to perform HARQ feedback on sideline data transmissions across multiple CCs within a single CC. This enables CCs that do not support HARQ feedback (e.g., CCs without configured PSFCH symbols) to also perform HARQ feedback, improving the reliability of CC transmission. For example, a CC without configured PSFCH symbols can use a CC with configured PSFCH symbols for HARQ feedback. Cross-CC feedback saves resources on other CCs besides the one used for HARQ feedback; resources originally used for HARQ feedback can be used to transmit other information, improving resource utilization efficiency. In application scenarios supporting the transmission of data for the same service across multiple CCs, this effectively increases the data transmission rate of the service and reduces the time required for data transmission. In this transmission scenario, cross-carrier feedback helps the transmitting UE control retransmissions. For example, when the transmitting UE needs to both send information and receive HARQ feedback, it is possible that the HARQ feedback will not be received on some CCs due to information transmission, thereby increasing the number of retransmissions. This application addresses this by centralizing HARQ feedback on one CC, allowing the transmitting UE to receive HARQ feedback on one CC and thus obtain HARQ feedback from each CC, reducing the number of retransmissions.

[0106] In this embodiment of the application, the receiving UE can map the transmission resources on multiple CCs to the PRBs used for HARQ feedback on the target PSFCH symbol according to the first indication information and the predetermined mapping rules.

[0107] The mapping rules can be known in advance by both the sending UE and the receiving UE. After receiving the first indication information, the receiving UE can determine the PRB used for HARQ feedback on the target PSFCH symbol corresponding to the transmission resources on multiple CCs according to the predetermined mapping rules. In other words, the receiving UE can determine the PRB used for HARQ feedback on the target PSFCH symbol corresponding to the transmission resources on multiple CCs through implicit or explicit determination rules.

[0108] For example, the preset mapping rule can be any one of the following mapping rule 1, mapping rule 2, or mapping rule 3. It should be noted that the preset mapping can also be other mapping rules, and this application does not impose any restrictions.

[0109] Mapping Rule 1: For transmission resources with larger sub-channel indices, the corresponding PRB index is larger. For transmission resources with the same sub-channel index, the transmission resource with a smaller time slot index corresponds to a smaller PRB index. In other words, during mapping, transmission resources on multiple CCs are mapped to multiple PRBs in a time-domain first, then frequency-domain manner.

[0110] When mapping using mapping rule 1, if a PRB set parameter is used to indicate the PRB for HARQ feedback corresponding to different CCs, see, for example, [link to example]. Figure 3 , Figure 3 A schematic diagram illustrating the mapping between a transmission resource and multiple PRBs in an embodiment of this application is provided. It should be noted that in this application... Figure 3 , Figure 5 and Figure 13 The transmission resources p# and PRBp shown have a mapping relationship, where p is an integer greater than or equal to 0.

[0111] In a typical NR V2X CA communication, the transmitting UE uses two CCs (CC0 and CC1) to transmit sidelink data to the receiving UE. For CC0, the higher layer configures a time slot containing the target PSFCH symbol for HARQ feedback of both CCs (i.e., CC0 is the first CC). The higher layer configures a transmission resource pool for CC0, which includes two frequency domain sub-channels; the higher layer configures a transmission resource pool for CC1, which includes three frequency domain sub-channels. Simultaneously, the higher layer configures 10 PRBs for each frequency domain sub-channel corresponding to CC0. Accordingly, the frequency domain width of the transmission resource pool corresponding to CC0 is 20 PRBs (10 × 2 = 20).

[0112] For a PSFCH symbol in a specific time slot of CC0, this PSFCH symbol is designated as the target PSFCH symbol. Two time slots of transmission resources in both CC0 and CC1 use the PRB on the target PSFCH symbol for HARQ feedback. Based on the implicit determination method of R16 NR V2X HARQ feedback resources (time domain first, frequency domain second), each transmission resource in CC0 and CC1 is numbered as follows: Figure 3 As shown in the figure (it should be noted that the numbering of transmission resources is only for ease of description, and in actual implementation, transmission resources may not be numbered).

[0113] exist Figure 3In the corresponding example, the higher layer configures only one PRB set parameter, sl-PSFCH-RB-Set, which indicates the PRB resources in the target PSFCH symbol that can be used for HARQ feedback. The target PSFCH includes 20 PRBs, of which 10 PRBs are usable for HARQ feedback, and the other 10 PRBs cannot be used due to power control and other reasons. Figure 3 As shown, the higher layer configures sl-PSFCH-RB-Set = 00110100110110101001 in bitmap form. Since there are 10 PRBs available for HARQ feedback, and the total number of transport resources corresponding to CC0 and CC1 is 10, the 10 PRBs used for HARQ feedback are associated with the 10 transport resources one-to-one.

[0114] like Figure 3 As shown, the transmission resources are determined in ascending order of their numbers to identify the corresponding PRBs on the target PSFCH symbol. Figure 3 In the target PSFCH symbols shown, each symbol is mapped one-to-one with a transport resource according to the ascending order of the value of q (see above for the meaning of q) (or the ascending order of the PRB index). For example... Figure 3 As shown, the PRBs used for HARQ feedback on the PSFCH symbol, sorted in ascending order of q value, are: PRB3, PRB4, PRB6, PRB9, PRB10, PRB12, PRB13, PRB15, PRB17, and PRB20. Mapping them one-to-one with transport resources yields the following relationships: Transport resource 1# is associated with PRB3, transport resource 2# with PRB4, transport resource 3# with PRB6, transport resource 4# with PRB9, transport resource 5# with PRB10, transport resource 6# with PRB12, transport resource 7# with PRB13, transport resource 8# with PRB15, transport resource 9# with PRB17, and transport resource 10# with PRB20.

[0115] It should be noted that, Figure 3 The mapping relationship between the transport resources and the PRBs used for HARQ feedback in the target PSFCH symbol given is only an example.

[0116] When using mapping rule 1, if different PRB set parameters are used to indicate the PRBs used for HARQ feedback corresponding to different CCs, see, for example... Figure 4 , Figure 4Another mapping diagram of transmission resources and multiple PRBs is given. In a single NR V2X CA communication, the transmitting UE uses two CCs (CC0 and CC1) to transmit sidelink data to the receiving UE. For CC0, the higher layer configures a time slot containing the target PSFCH symbol for HARQ feedback of both CCs (i.e., CC0 is the first CC). The higher layer configures a transmission resource pool for CC0, which includes two frequency domain sub-channels; the higher layer configures a transmission resource pool for CC1, which includes three frequency domain sub-channels. Simultaneously, the higher layer configures 10 PRBs for each frequency domain sub-channel corresponding to CC0. Correspondingly, the frequency domain width of the transmission resource pool corresponding to CC0 is 20 PRBs (10 × 2 = 20).

[0117] For a PSFCH symbol in a specific time slot of CC0, this PSFCH symbol is designated as the target PSFCH symbol. Two time slots of transmission resources for both CC0 and CC1 utilize the PRB on the target PSFCH symbol for HARQ feedback. For CC0, the higher-layer configuration sl-PSFCH-RB-Set = 00100000100110000000; for CC1, the higher-layer configuration sl-PSFCH-RB-Set = 00010100010000101001. Based on their respective sl-PSFCH-RB-Set parameters, the transmission resources on CC0 and CC1 are mapped to the PRBs used for HARQ feedback on the target PSFCH, respectively. The specific mapping results are detailed in [reference needed]. Figure 4 .

[0118] The four transport resources on CC0 correspond to PRB3, PRB9, PRB12, and PRB13 on the target PSFCH symbol. This can be done as described above. Figure 3 In the corresponding embodiment, the four transmission resources on CC0 are numbered in the order of time domain first and then frequency domain, and transmission resource 1# is associated with PRB3, transmission resource 2# with PRB9, transmission resource 3# with PRB12, and transmission resource 4# with PRB13.

[0119] Accordingly, the six transport resources on CC1 correspond to PRB4, PRB6, PRB10, PRB15, PRB17, and PRB20 on the target PSFCH symbol. This can be done as described above. Figure 3 In the corresponding embodiment, the six transmission resources on CC1 are numbered in the order of time domain first and then frequency domain, and transmission resource 5# is associated with PRB4, transmission resource 6# with PRB6, transmission resource 7# with PRB10, transmission resource 8# with PRB15, transmission resource 9# with PRB17, and transmission resource 10# with PRB20.

[0120] If the above mapping rule 1 is expressed using a formula, then on the first CC (assuming it is CC0), the mapping rule is applied to the k-th (k∈[0,N]) CC located in time slot i (i in K). k Within the range), subchannel j∈{0,1,…,S k The frequency domain location for HARQ feedback of the transmission resources of} is:

[0121]

[0122] in, K represents the number of PRBs that perform HARQ feedback for a given transport resource; k Characterizing that there is K on the k-th CC k The transmission resources of each time slot use the target PSFCH symbol on the first CC for HARQ feedback; K l Characterizing that there is K on the l-th CC l The transmission resources of each time slot use the target PSFCH symbol on the first CC for HARQ feedback; S k S represents the maximum subchannel index corresponding to the k-th CC; l The index of the largest subchannel corresponding to the l-th CC is 0 ≤ l ≤ k-1; N is the total number of PRBs used for HARQ feedback; N+1 is the total number of the multiple CCs mentioned above.

[0123] Mapping rule 2: The smaller the sub-channel index, the larger the corresponding PRB index for the transmission resource. For transmission resources with the same sub-channel index, the smaller the time slot index, the smaller the corresponding PRB index.

[0124] When using mapping rule 2 for mapping, if a PRB set parameter is used to indicate the PRB used for HARQ feedback for different CCs, Figure 3 The number of the transmission resource shown can be found in [reference]. Figure 5 At this point, the mapping relationship can still be as follows: transmission resource 1# is associated with PRB3, transmission resource 2# is associated with PRB4, transmission resource 3# is associated with PRB6, transmission resource 4# is associated with PRB9, transmission resource 5# is associated with PRB10, transmission resource 6# is associated with PRB12, transmission resource 7# is associated with PRB13#, transmission resource 8# is associated with PRB15, transmission resource 9# is associated with PRB17, and transmission resource 10# is associated with PRB20.

[0125] When using mapping rule 2, if different PRB set parameters are used to indicate the PRBs used for HARQ feedback corresponding to different CCs, Figure 4 The number of the transmission resource shown can be found in [reference]. Figure 6For CC0, transmission resource 1# is associated with PRB3, transmission resource 2# with PRB9, transmission resource 3# with PRB12, and transmission resource 4# with PRB13. For CC1, transmission resource 5# is associated with PRB4, transmission resource 6# with PRB6, transmission resource 7# with PRB10, transmission resource 8# with PRB15, transmission resource 9# with PRB17, and transmission resource 10# with PRB20.

[0126] Mapping rule 3: The smaller the sub-channel index, the larger the corresponding PRB index for the transmission resource; for transmission resources with the same sub-channel index, the smaller the time slot index, the larger the corresponding PRB index.

[0127] Mapping rule 4: The larger the sub-channel index, the smaller the corresponding PRB index; for transmission resources with the same sub-channel index, the smaller the time slot index, the larger the corresponding PRB index.

[0128] The principles of the mapping process for mapping rules 3 and 4 are similar to those for mapping rules 1 and 2. Please refer to the relevant descriptions of mapping rules 1 and 2 for understanding, which will not be repeated here.

[0129] In the examples above, the mapping rules are illustrated by mapping the values ​​of q one by one with the transmission resources in ascending order. In actual implementation, the values ​​of q can also be mapped one by one with the transmission resources in descending order (or in other words, the PRB indexes can be mapped in descending order). This application does not impose any restrictions.

[0130] In other embodiments of this application, if different PRB set parameters are used to indicate the PRBs for HARQ feedback corresponding to different CCs, the transmission resources on CC1 can be mapped to the PRBs in the target PSFCH symbol first, and then the transmission resources on CC0 can be mapped to the PRBs in the target PSFCH symbol. This application does not impose any restrictions.

[0131] It is understood that other mapping rules can also be used in this application to map transport resources to PRBs used for HARQ feedback in the target PSFCH symbol. The key is to ensure that different transport resources correspond to different PRBs used for HARQ feedback. This mapping rule can be pre-defined and known in advance to the higher layers and the UE.

[0132] In this embodiment of the application, in order to better map the transmission resources and PRBs (e.g., to ensure that the number of PRBs used for HARQ feedback is the same for each transmission resource), or to enable HARQ information from one CC to be fed back from multiple CCs without increasing PSFCH resources (including all PSFCH symbols used for HARQ feedback), if the first sub-channel width cannot make the ratio of the number of the multiple PRBs to the number of transmission resources on the multiple CCs a positive integer, the feedback resource determination method may further include:

[0133] S11, the access network device sends second indication information, which indicates the second sub-channel width of the resource pool used for the current communication. The second sub-channel width ensures that the ratio of the number of multiple PRBs to the number of transmission resources on multiple CCs is a positive integer. The first sub-channel width is the sub-channel width of the resource pool configured for the receiving UE and the sending UE before configuring the second sub-channel width of the resource pool. Correspondingly, the receiving UE and the sending UE receive the second indication information.

[0134] S12, the receiving UE and the sending UE determine the width of the sub-channel of the resource pool used for the current communication as the second sub-channel width according to the second indication information.

[0135] By employing the above method, HARQ feedback to multiple CCs via the first CC can be achieved without increasing PSFCH resources. Specifically, assuming that when CC0 performs HARQ feedback alone, the number of transmission resources mapped to a PSFCH symbol in a certain time slot for HARQ feedback is M, meaning there are M transmission resources using the PRBs in that PSFCH symbol for HARQ feedback; when multiple CCs are supported, the total number of transmission resources on all CCs remains constant at M by adjusting the sub-channel width of the resource pool on each CC (i.e., the number of PRBs contained in each sub-channel). Furthermore, by using the procedure in Section 16.3 of TS 38.213 to map each transmission resource to the corresponding PSFCH symbol on CC0, HARQ information from multiple carriers can be fed back by CC0 without increasing PSFCH resources.

[0136] Specifically, such as Figure 7 As shown in (a), when CC0 performs HARQ feedback alone, its 100 PRBs in the frequency domain of the transmission resource pool are divided into 5 sub-channels, each containing 20 PRBs. Since the transmission resources in two time slots correspond to the PSFCH symbols in one time slot, it can be determined that each PSFCH symbol will be used to feed back HARQ information for 5*2=10 transmission resources. When a CA containing two CCs is used, the number of PRBs corresponding to each sub-channel is reconfigured by the higher layers to keep the total number of transmission resources at 10.

[0137] For example, see Figure 7 In step (b), each subchannel in CC0 can be configured with 50 PRBs, so that the transmission resources for HQRQ feedback using PSFCH symbols in a certain time slot in CC0 are 4. By configuring the frequency domain subchannel width of the CC1 resource pool, the number of transmission resources for HARQ feedback using PSFCH symbols in a certain time slot in CC0 is controlled to 6. At this time, the total number of transmission resources on CC0 and CC1 is 10. Then, in the same way as when CC0 performs HARQ feedback alone, the 10 transmission resources in the two CCs are sequentially associated with the 10 groups of PRBs on the PSFCH symbols originally used for HARQ feedback in CC0.

[0138] Method 2: Implemented through the time domain.

[0139] In method two, see Figure 8 Another method for determining feedback resources provided in this application embodiment includes:

[0140] S801. The access network device generates fourth indication information. The fourth indication information is used to indicate multiple PSFCH symbols. The PRB on the multiple PSFCH symbols is used to perform HARQ feedback on the sideline data transmission on the transmission resources of X CCs. The multiple PSFCH symbols are OFDM symbols on the first CC among the X CCs, where X is an integer greater than 1.

[0141] For example, multiple PSFCH symbols can be two PSFCH symbols.

[0142] S801 is an optional step.

[0143] S802, the access network device sends the fourth indication information. Correspondingly, both the receiving UE and the sending UE receive the fourth indication information.

[0144] S803. The receiving UE, based on the fourth indication information, uses the PRBs on the PSFCH symbols corresponding to X CCs for HARQ feedback of sideline data transmission. The PSFCH symbols corresponding to the X CCs are determined according to the fourth indication information. For an explanation of the PSFCH symbols, please refer to the above; they will not be repeated here. Correspondingly, the sending UE, based on the fourth indication information, uses the PRBs on the PSFCH symbols corresponding to X CCs to receive HARQ feedback of sideline data transmission on the transmission resources of X CCs.

[0145] After determining the PSFCH symbol corresponding to each CC, the existing method can be used to determine the time slot where the PSFCH symbol corresponding to each CC is located. For each transmission resource on each CC, the existing method can be used to determine one or more PRBs on the PSFCH symbol corresponding to that CC for HARQ feedback.

[0146] Optionally, when indicating multiple PSFCH symbols, the fourth indication information can be implemented using method 1, method 2, or method 3.

[0147] Method 1

[0148] The fourth indication information is used to indicate the time-domain offset corresponding to multiple CCs one-to-one. The time-domain offset corresponding to a CC is used to determine the time slot where the PSFCH symbol for HARQ feedback for that CC is located. At this time, the PSFCH symbols for HARQ feedback corresponding to different CCs can be in the same position in the time slot, but the time-domain offsets corresponding to different CCs are different.

[0149] In Method 1, in one case, the fourth indication information includes X time-domain offsets, each corresponding to one of the X CCs. In another case, the fourth indication information includes X-1 time-domain offsets, each corresponding to one of the X-1 CCs excluding the first CC.

[0150] In Method 1, for example, in a single NR V2X CA communication, the transmitting UE uses two CCs, CC0 and CC1, to transmit sidelink data to the receiving UE. For the transmission resource pool on CC0, the higher-layer configuration parameter sl-PSFCH-Period = 4, meaning the period (denoted as L) of the PSFCH symbol is configured as 4 time slots. The time-domain offsets corresponding to the two CCs are configured as follows using the fourth indication information: T0 = 0, T1 = 3. Here, T0 refers to the time-domain offset corresponding to CC0, and T1 refers to the time-domain offset corresponding to CC1.

[0151] At this time, the slot index on CC0 is The PSFCH symbol in the time slot can be used for HARQ feedback of sideline data transmission on CC0. The time slot index on CC0 is... The PSFCH symbol in the time slot can be used for HARQ feedback of sideline data transmission on CC1.

[0152] For example, in Figure 9 In the process, the PSFCH resources in time slots n+3 and n+7 are used for HARQ feedback of side-line data transmission on CC0, and the PSFCH resources in time slots n+2 and n+6 are used for HARQ feedback of side-line data transmission on CC1. This means that k is a non-negative integer.

[0153] In Method 1, for example, the range of values ​​for the time-domain offset can be {0, 1, 2, 3}.

[0154] In Method 1, from a time domain perspective, by allocating different time slots with PSFCH resources to different CCs, the transmission resources on each CC correspond one-to-one with the PSFCH resources on the first CC, thereby enabling HARQ feedback to multiple CCs through the first CC.

[0155] Method 2

[0156] The fourth indication information is used to indicate X PSFCH symbols located in the same time slot. The X PSFCH symbols correspond one-to-one with X CCs, and the X PSFCH symbols appear periodically. The period of the X PSFCH symbols can be configured through the higher-level configuration parameter sl-PSFCH-Period.

[0157] In mode 2, X can be equal to 2. In this case, the X PSFCH symbols can be the third-to-last OFDM symbol and the second-to-last OFDM symbol in the time slot containing the PSFCH symbol. For example, in an NR V2X CA communication, the transmitting UE uses two CCs, CC0 and CC1, to transmit sideline data to the receiving UE. For CC0, the third-to-last symbol in the time slot containing the PSFCH symbol is used for HARQ feedback; for CC1, the second-to-last symbol in the time slot containing the PSFCH symbol is used for HARQ feedback.

[0158] In Method 2, the existing protocol can be improved by increasing the number of PSFCH symbols in the CC time slot from 2 to 3. (See reference...) Figure 10 The diagram illustrates the conventional time slot structure as defined in existing protocols. According to existing protocols, a time slot can contain 14 OFDM symbols, numbered symbol 1 through symbol 14. Figure 10 In this configuration, the PSFCH symbol is located in the 12th and 13th OFDM symbols, with the 12th OFDM symbol being a copy of the 13th OFDM symbol. This is used for Automatic Gain Control (AGC). A schematic diagram of the improved time slot structure can be found in [reference needed]. Figure 11 , Figure 11 In this context, the PSFCH symbols are the 11th, 12th, and 13th OFDM symbols, and the 11th OFDM symbol is a copy of the 12th OFDM symbol, used for AGC; the 12th and 13th OFDM symbols are the aforementioned X PSFCH symbols, which can be used to carry HARQ feedback corresponding to different CCs.

[0159] It should be noted that, Figure 10 as well as Figure 11All of these are based on the scenario where a single transmission occupies the entire time slot. When a single transmission uses only a portion of the OFDM symbols in one time slot, the newly added PSFCH symbol in this application embodiment is an OFDM symbol preceding the first PSFCH symbol in that transmission time slot.

[0160] In Method 2, from the perspective of time slot structure, different PSFCH symbols within the same time slot are allocated to different CCs, and the mapping method in the original protocol is used to realize that the transmission resources on each CC correspond one-to-one with the PSFCH resources on the first CC, so that HARQ feedback is performed on multiple CCs through the first CC.

[0161] Method 3

[0162] The fourth indication information is used to indicate the time-domain offset corresponding to multiple CC groups and the Y PSFCH symbols in the same time slot corresponding to each CC group. The Y PSFCH symbols corresponding to a CC group correspond one-to-one with the CCs in that CC group. The time-domain offset corresponding to a CC group is used to determine the time slot where the PSFCH symbols used for HARQ feedback for that CC group are located. At this time, the time-domain offsets corresponding to different CC groups are different. Multiple CC groups are obtained by grouping multiple CCs. The Y PSFCH symbols in the same time slot corresponding to each CC group can appear periodically.

[0163] For example, suppose there are 4 CCs, namely CC0-CC4, where CC group 1 includes CC0 and CC1, CC group 2 includes CC3 and CC4, based on... Figure 9 In the example shown, if the time-domain offset corresponding to CC group 1 is 0 and the time-domain offset corresponding to CC group 2 is 3, then the slot index of CC group 1 on CC0 is... HARQ feedback is performed on the PSFCH symbol in the time slot, and the time slot index of CC group 2 on CC0 is... HARQ feedback is performed on the PSFCH symbol in the time slot.

[0164] For example, in Figure 9 In the process, the PSFCH resources in time slots n+3 and n+7 are used for HARQ feedback of side data transmission on CC group 1, and the PSFCH resources in time slots n+2 and n+6 are used for HARQ feedback of side data transmission on CC group 2. Based on Figure 11In the example shown, if the PSFCH symbol corresponding to CC1 in CC group 1 is PSFCH symbol 12#, and the PSFCH symbol corresponding to CC2 in CC group 1 is PSFCH symbol 13#, then the sideline data transmission on CC1 will be HARQ-feedback on symbols 12 in time slots n+3 and n+7 of CC0, and the sideline data transmission on CC2 will be HARQ-feedback on symbols 13 in time slots n+2 and n+6 of CC0. If the PSFCH symbol corresponding to CC3 in CC group 2 is PSFCH symbol 12#, and the PSFCH symbol corresponding to CC4 in CC group 2 is PSFCH symbol 13#, then the sideline data transmission on CC3 will be HARQ-feedback on symbols 12 in time slots n+3 and n+7 of CC0, and the sideline data transmission on CC4 will be HARQ-feedback on symbols 13 in time slots n+2 and n+6 of CC0.

[0165] In Method 2, the receiving UE can perform HARQ feedback on sideline data transmissions across multiple CCs within a single CC using a time-domain approach. This allows CCs that do not support HARQ feedback (e.g., CCs without configured PSFCH symbols) to also perform HARQ feedback, improving the reliability of CC transmission. For example, a CC without configured PSFCH symbols can use a CC with configured PSFCH symbols for HARQ feedback. Cross-CC feedback saves resources on other CCs besides the one used for HARQ feedback; for instance, resources on other CCs that were originally used for HARQ feedback can be used to transmit other information, improving resource utilization efficiency. In application scenarios where the same service's data is transmitted across multiple CCs, this effectively increases the data transmission rate of the service and reduces the time required for data transmission. In this transmission scenario, cross-carrier feedback helps the transmitting UE control retransmissions. For example, when the transmitting UE needs to both send information and receive HARQ feedback, it is possible that the HARQ feedback will not be received on some CCs due to information transmission, thereby increasing the number of retransmissions. This application addresses this by centralizing HARQ feedback on one CC, allowing the transmitting UE to receive HARQ feedback on one CC and thus obtain HARQ feedback from each CC, reducing the number of retransmissions.

[0166] Method 3: Achieve this through a combination of time and frequency domains.

[0167] In method three, see Figure 12 Another feedback resource determination method provided in this application includes:

[0168] S1201, the access network device generates first indication information and third indication information.

[0169] The first indication information is used to indicate multiple PRBs, which are multiple PRBs on the target PSFCH symbol. These multiple PRBs are used for HARQ feedback on side-line data transmission over the transmission resources of multiple CCs. Other relevant descriptions of the first indication information can be found above and will not be repeated here. The third indication information is used to indicate the target PSFCH symbol. The method by which the third indication information indicates the PSFCH symbol can be found in Method 1, Method 2, or Method 3 above. For example, when using Method 1, the third indication information can be used to indicate the time-domain offset corresponding one-to-one with multiple CCs. The time-domain offset corresponding to a CC is used to determine the time slot where the target PSFCH symbol for HARQ feedback is located.

[0170] The target PSFCH symbol may include at least one PSFCH symbol.

[0171] S1201 is an optional step.

[0172] S1202, the access network device sends a first indication message and a third indication message. Correspondingly, both the receiving UE and the sending UE receive the first indication message and the third indication message.

[0173] S1203, the receiving UE performs HARQ feedback on sideline data transmission on the transmission resources of multiple CCs using multiple PRBs according to the first indication information and the third indication information. Correspondingly, the sending UE receives HARQ feedback on sideline data transmission on the transmission resources of multiple CCs using multiple PRBs according to the first indication information and the third indication information.

[0174] Optionally, prior to S1203, the method further includes: the receiving UE mapping the transmission resources on multiple CCs to multiple PRBs on the target PSFCH symbol according to the first indication information and the third indication information. After mapping, the receiving UE can use the PRB corresponding to a CC to perform HARQ feedback for sideline data transmission on that CC.

[0175] Accordingly, the transmitting UE maps the transmission resources on multiple CCs to multiple PRBs on the target PSFCH symbol based on the first and third indication information, in order to determine which PRBs receive HARQ feedback for sideline data transmission on which CC. The specific mapping process between transmission resources and PRBs is similar to that of the receiving UE and can be understood by referring to the following text, and will not be repeated here.

[0176] During mapping, if the target PSFCH symbol comprises M symbols, multiple CCs can be divided into M groups, where M is the number of PSFCH symbols in the target PSFCH symbol. Each group of CCs corresponds to one PSFCH symbol in the target PSFCH symbol. HARQ feedback for side-transmission data on a CC within a group is performed on the corresponding PSFCH symbol. For details on how HARQ feedback is performed on the corresponding PSFCH symbol for side-transmission data on each CC within a group, please refer to Method 1; it will not be elaborated upon here.

[0177] The target PSFCH symbol can be multiple symbols located in the same time slot (e.g., PSFCH symbol 12# and PSFCH symbol 13# in time slot n+2), or multiple symbols located in different time slots, with only one PSFCH symbol in each time slot (e.g., PSFCH symbol 12# in time slot n+2 and PSFCH symbol 12# in time slot n+3), or multiple symbols located in different time slots, with multiple PSFCH symbols in each time slot (e.g., PSFCH symbol 12# in time slot n+2, PSFCH symbol 13# in time slot n+2, PSFCH symbol 12# in time slot n+3, and PSFCH symbol 13# in time slot n+3).

[0178] For example, in an NR V2X CA communication, the transmitting UE uses eight CCs (CC0 to CC7) to transmit sidelink data to the receiving UE. Each pair of CCs can be grouped together; for example, CC group 1 includes CC0 and CC1, CC group 2 includes CC2 and CC3, CC group 3 includes CC4 and CC5, and CC group 4 includes CC6 and CC7. The transmission resource pool for each CC group is considered a logical resource pool. Furthermore, each CC group corresponds to one PSFCH symbol in the transmission resource pool of CC0. That is, four CC groups correspond to four PSFCH symbols in the transmission resource pool of CC0.

[0179] The time slot structure is extended by adding one PSFCH symbol to each time slot containing a PSFCH symbol. The same time-domain offset is configured for CC groups 1 and 2, and the same time-domain offset is configured for CC groups 3 and 4. Furthermore, it can be determined that CC groups 1 and 2 use two PSFCH symbols within the same time slot, and CC groups 3 and 4 use two PSFCH symbols within the same time slot. Through the joint design of the above scheme, the time-domain position and the frequency-domain position of each carrier are determined. Then, following the procedure in Section 16.3 of TS 38.213, the PRB position on the PSFCH corresponding to the transmission resources is determined for each logical resource pool formed by the groups. For example, Figure 13The correspondence between transmission resources on CC0 to CC7 and PSFCH resources on CC0 is given. Specifically, transmission resources on CC0 to CC4 are fed back on slot A, and those on CC5 to CC7 (not shown in the figure) are fed back on slot B. CC group 1 and CC group 2 correspond to the third-to-last OFDM symbol and the second-to-last OFDM symbol of their respective slots, respectively, and each PSFCH symbol is configured with a different sl-PSFCH-RB-Set. For the logical resource pool formed on CC group 1, its transmission resources correspond to the PRB available for HARQ feedback on the third-to-last OFDM symbol; the process is the same for other CCs.

[0180] This embodiment determines feedback resources by combining time and frequency domain methods, which can overcome the problem of limited number of CCs when using time or frequency domain methods to determine feedback resources alone, and make better use of existing time and frequency resources, thereby improving the efficiency of time and frequency resource utilization.

[0181] In Method 3, a time-frequency domain combination approach allows the receiving UE to perform HARQ feedback on sideline data transmissions across multiple CCs from a single CC. This enables CCs that do not support HARQ feedback (e.g., CCs without configured PSFCH symbols) to also perform HARQ feedback, improving the reliability of CC transmission. For example, a CC without configured PSFCH symbols can use a CC with configured PSFCH symbols for HARQ feedback. Cross-CC feedback saves resources on other CCs besides the one used for HARQ feedback; for instance, resources on other CCs originally used for HARQ feedback can be used to transmit other information, improving resource utilization efficiency. In application scenarios supporting the transmission of data for the same service across multiple CCs, this effectively increases the data transmission rate of the service and reduces the time required for data transmission. In this transmission scenario, cross-carrier feedback helps the transmitting UE control retransmissions. For example, when the transmitting UE needs to both send information and receive HARQ feedback, it is possible that the HARQ feedback will not be received on some CCs due to information transmission, thereby increasing the number of retransmissions. This application addresses this by centralizing HARQ feedback on one CC, allowing the transmitting UE to receive HARQ feedback on one CC and thus obtain HARQ feedback from each CC, reducing the number of retransmissions.

[0182] The method provided in the above embodiments of this application, in the CA scenario of the side link, expands the time-domain, frequency-domain, or time-frequency resources on the first CC for HARQ feedback, allocates non-overlapping resources on the first CC for HARQ feedback to different CCs, and follows the procedure in Section 16.3 of TS 38.213 to uniquely associate the transmission resources on each CC with the resources on the first CC for HARQ feedback, thereby realizing HARQ feedback from one CC to multiple CCs.

[0183] It should be noted that the methods provided in this application can be combined as long as they do not contradict each other. For example, the method shown in Method 3 can be combined with the technical solutions in Method 1 and / or Method 2 as long as they do not contradict each other. For example, in Method 3, the access network device can also send the second indication information to the receiving UE and the sending UE. In this case, the access network device can send the third indication information after sending the first indication information and / or sending the second indication information; it can also send the third indication information before sending the first indication information and / or sending the second indication information; or, the access network device can send the first indication information and / or send the second indication information without any connection with sending the third indication information.

[0184] In addition, when determining feedback resources, if a certain CC carries HARQ feedback corresponding to different CCs, some time slots containing PSFCH symbols on that CC can be determined using the frequency domain feedback resource determination method, while other time slots can be determined using the time domain feedback resource determination method.

[0185] It should be noted that, since multiple PRBs on the first CC are used to perform HARQ feedback for multiple CCs in this embodiment, the PSFCH period can be configured to 0 on the other CCs besides the first CC. That is, there are no PSFCH symbols in any time slot on the other CCs besides the first CC, thereby increasing the number of OFDM symbols used for data transmission on the other CCs besides the first CC, and thus increasing the amount of data that the other CCs besides the first CC can carry.

[0186] Reference Figure 14 This application embodiment also provides a feedback resource determination device 140, including: a sending unit 141. Optionally, it further includes a processing unit 142, and the sending unit 141 can perform the corresponding actions described below under the control of the processing unit 142; wherein:

[0187] The transmitting unit 141 is used to transmit first indication information, which is used to indicate multiple PRBs. The multiple PRBs are multiple PRBs on a target PSFCH symbol. The multiple PRBs are used to perform HARQ feedback on side-line data transmission on the transmission resources of multiple component carriers. The target PSFCH symbol is an OFDM symbol on the first component carrier among the multiple component carriers.

[0188] In one embodiment, the processing unit 142 may be used to generate first indication information.

[0189] In one embodiment, the PRBs used for HARQ feedback corresponding to different component carriers do not overlap.

[0190] In one embodiment, the number of PRBs for HARQ feedback corresponding to each transmission resource on each component carrier is N / M, where N is the number of the plurality of PRBs and M is the sum of the number of transmission resources used for HARQ feedback on the plurality of component carriers using the target PSFCH symbol; the transmission resource occupies one time slot in the time domain and one subchannel in the frequency domain.

[0191] In one embodiment, the first indication information includes at least one PRB set parameter, which is used to indicate the plurality of PRBs.

[0192] In one embodiment, the at least one PRB set parameter is a plurality of PRB set parameters corresponding one-to-one with the plurality of component carriers, and the PRB set parameter corresponding to a component carrier is used to indicate the PRB for HARQ feedback corresponding to that component carrier.

[0193] In one embodiment, the PRB set parameters are configured in bitmap form, and the number of bits contained in the PRB set parameters is equal to the number of PRBs on the target PSFCH symbol.

[0194] In one embodiment, if the first sub-channel width cannot make the ratio of the number of the plurality of PRBs to the number of transmission resources on the plurality of component carriers a positive integer, the transmitting unit 141 is further configured to: transmit second indication information, the second indication information being used to indicate a second sub-channel width for the resource pool used for the current communication, the second sub-channel width being able to make the ratio of the number of the plurality of PRBs to the number of transmission resources on the plurality of component carriers a positive integer; the first sub-channel width being the sub-channel width of the resource pool configured before configuring the second sub-channel width of the resource pool.

[0195] In one embodiment, the target PSFCH symbol includes a plurality of PSFCH symbols, and the transmitting unit 141 is further configured to: transmit third indication information, the third indication information being used to indicate the target PSFCH symbol.

[0196] In one embodiment, the third indication information is used to indicate the time-domain offset corresponding to each of the plurality of component carriers, and the time-domain offset corresponding to a component carrier is used to determine the time slot where the PSFCH symbol for HARQ feedback is located.

[0197] In one embodiment, the target PSFCH symbol comprises two PSFCH symbols.

[0198] Reference Figure 15 This application embodiment also provides another feedback resource determination device 150, including: a receiving unit 151 and a processing unit 152, wherein:

[0199] The receiving unit 151 is configured to receive first indication information, which indicates multiple PRBs, wherein the multiple PRBs are multiple PRBs on a target PSFCH symbol, and the multiple PRBs are used to perform HARQ feedback on side-line data transmission on the transmission resources of multiple component carriers, wherein the target PSFCH symbol is an OFDM symbol on the first component carrier among the multiple component carriers.

[0200] Processing unit 152 is configured to perform HARQ feedback on side-line data transmission on the transmission resources of the plurality of component carriers using the plurality of PRBs according to the first indication information.

[0201] In one embodiment, the processing unit 152 is further configured to: map the transmission resources on the plurality of component carriers to the PRBs used for HARQ feedback on the target PSFCH symbol according to the first indication information.

[0202] In one embodiment, the processing unit 152 is specifically configured to: map the transmission resources on the plurality of component carriers to the PRBs used for HARQ feedback on the target PSFCH symbol according to the first indication information and a predetermined mapping rule.

[0203] In one embodiment, the predetermined mapping rule is: the larger the sub-channel index, the larger the corresponding PRB index; for transmission resources with the same sub-channel index, the smaller the time slot index, the smaller the corresponding PRB index.

[0204] In one embodiment, the first indication information includes at least one PRB set parameter, which is used to indicate the plurality of PRBs.

[0205] In one embodiment, the number of PRBs for HARQ feedback corresponding to each transmission resource on each component carrier is N / M, where N is the number of the plurality of PRBs and M is the sum of the number of transmission resources used for HARQ feedback on the plurality of component carriers using the target PSFCH symbol; the transmission resource occupies one time slot in the time domain and one subchannel in the frequency domain.

[0206] In one embodiment, the at least one PRB set parameter is a plurality of PRB set parameters corresponding one-to-one with the plurality of component carriers, and the PRB set parameter corresponding to a component carrier is used to indicate the PRB for HARQ feedback corresponding to that component carrier.

[0207] In one embodiment, the PRB set parameters are configured in bitmap form, and the number of bits contained in the PRB set parameters is equal to the number of PRBs on the target PSFCH symbol.

[0208] In one embodiment, if the first sub-channel width cannot make the ratio of the number of the plurality of PRBs to the number of transmission resources on the plurality of component carriers a positive integer, the receiving unit 151 is further configured to receive second indication information, the second indication information being used to indicate the second sub-channel width of the resource pool used for the current communication, the second sub-channel width being able to make the ratio of the number of the plurality of PRBs to the number of transmission resources on the plurality of component carriers a positive integer; the first sub-channel width is the sub-channel width of the resource pool configured for the receiving end user equipment before configuring the second sub-channel width of the resource pool; the processing unit 152 is further configured to determine the width of the sub-channel of the resource pool as the second sub-channel width according to the second indication information.

[0209] In one embodiment, the target PSFCH symbol includes multiple PSFCH symbols, and the receiving unit 151 is further configured to: receive third indication information, the third indication information being used to indicate the target PSFCH symbol; the processing unit 152 is further configured to, based on the third indication information, determine the PSFCH symbols corresponding to the multiple component carriers for HARQ feedback for sideline data transmission.

[0210] In one embodiment, the third indication information is used to indicate the time-domain offset corresponding to each of the plurality of component carriers, and the time-domain offset corresponding to a component carrier is used to determine the time slot where the PSFCH symbol for HARQ feedback is located.

[0211] In one embodiment, the target PSFCH symbol comprises two PSFCH symbols.

[0212] Regarding the modules / units included in the various devices and products described in the above embodiments, they may be software modules / units, hardware modules / units, or a combination of both.

[0213] For example, for various devices and products applied to or integrated into a chip, each module / unit can be implemented using hardware methods such as circuits, or at least some modules / units can be implemented using software programs that run on a processor integrated within the chip, while the remaining (if any) modules / units can be implemented using hardware methods such as circuits; for various devices and products applied to or integrated into a chip module, each module / unit can be implemented using hardware methods such as circuits, and different modules / units can be located in the same component (e.g., chip, circuit module, etc.) or different components of the chip module, or at least some modules / units can be implemented using hardware methods such as circuits. The components can be implemented using software programs that run on the processor integrated within the chip module. The remaining (if any) modules / units can be implemented using hardware methods such as circuits. For various devices and products applied to or integrated into the terminal, each of its components / units can be implemented using hardware methods such as circuits. Different modules / units can be located in the same component (e.g., chip, circuit module, etc.) or in different components within the terminal. Alternatively, at least some modules / units can be implemented using software programs that run on the processor integrated within the terminal, while the remaining (if any) modules / units can be implemented using hardware methods such as circuits.

[0214] This application also provides a computer-readable storage medium, which is a non-volatile or non-transient storage medium, storing a computer program thereon. When the computer program is run by a processor, the steps of the feedback resource determination method provided in the above embodiments are executed.

[0215] In the embodiments of this application, the storage medium may include non-volatile memory or non-transitory memory, and may also include optical disks, hard disk drives, solid-state drives, etc.

[0216] Reference Figure 16This application also provides another feedback resource determination device, including a processor 162 coupled to a memory 161, which may be located within or outside the device. Optionally, a transceiver 163 is also included. The memory 161, processor 162, and transceiver 163 can be connected via a communication bus. The memory 161 stores a computer program that can run on the processor 162. When the processor 162 runs the computer program, it executes the steps in the feedback resource determination method provided in the above embodiments. The transceiver 163 can perform the sending and / or receiving actions described above under the control of the processor 162. This feedback resource determination device can be an access network device as described above, or a receiving UE or a sending UE.

[0217] In this embodiment, the memory 161 includes non-volatile or non-transitory memory, and may also include optical disks, hard disks, solid-state drives, etc.

[0218] In this embodiment, the processor 162 can be a central processing unit (CPU), but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0219] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be performed by a program instructing related hardware. The program can be stored in a computer-readable storage medium, which may include ROM, RAM, disk, or optical disk, etc.

[0220] The embodiments described in this application are described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (devices), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0221] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0222] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0223] It should also be noted that in the embodiments of this application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, the simultaneous existence of A and B, or the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0224] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0225] This application can be described in the general context of computer-executable instructions, such as program modules, that are executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform a specific task or implement a specific abstract data type. This application can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0226] The various embodiments in this application are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0227] Those skilled in the art will recognize that the units and algorithm steps described in the embodiments of this application can be implemented using electronic hardware, computer software, or a combination of electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0228] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the devices, apparatuses, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0229] The above description is merely a specific embodiment of this application. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application. The protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A method for determining feedback resources, characterized in that, include: Send first indication information, which is used to indicate multiple physical resource blocks (PRBs). The multiple PRBs are multiple PRBs on the target physical direct link feedback channel (PSFCH) symbol. The multiple PRBs are used to perform hybrid automatic repeat request (HARQ) feedback for side-line data transmission on the transmission resources of multiple component carriers. The target PSFCH symbol is an orthogonal frequency division multiplexing (OFDM) symbol on the first component carrier among the multiple component carriers. The PRBs used for HARQ feedback corresponding to different component carriers do not overlap. The first indication information includes at least one PRB set parameter, which is used to indicate the plurality of PRBs; one of the PRB set parameters is used to indicate the PRB for HARQ feedback corresponding to different component carriers.

2. The feedback resource determination method as described in claim 1, characterized in that, The number of PRBs used for HARQ feedback corresponding to each transmission resource on each component carrier is N / M, where N is the number of the multiple PRBs and M is the total number of transmission resources used for HARQ feedback on the multiple component carriers using the target PSFCH symbol; the transmission resource occupies one time slot in the time domain and one sub-channel in the frequency domain.

3. The feedback resource determination method as described in claim 1, characterized in that, The at least one PRB set parameter is a plurality of PRB set parameters that correspond one-to-one with the plurality of component carriers. The PRB set parameter corresponding to a component carrier is used to indicate the PRB for HARQ feedback corresponding to that component carrier.

4. The feedback resource determination method as described in claim 1, characterized in that, The PRB set parameters are configured in bitmap form, and the number of bits contained in the PRB set parameters is equal to the number of PRBs on the target PSFCH symbol.

5. The feedback resource determination method as described in any one of claims 1-4, characterized in that, If the first sub-channel width cannot ensure that the ratio of the number of the plurality of PRBs to the number of transmission resources on the plurality of component carriers is a positive integer, the method further includes: Send a second indication message, which indicates the second sub-channel width of the resource pool used for the current communication. The second sub-channel width enables the ratio of the number of the plurality of PRBs to the number of transmission resources on the plurality of component carriers to be a positive integer. The first sub-channel width is the sub-channel width of the resource pool configured before configuring the second sub-channel width of the resource pool.

6. The feedback resource determination method as described in claim 5, characterized in that, The target PSFCH symbol includes multiple PSFCH symbols, and the method further includes: Send a third indication message, which is used to indicate the target PSFCH symbol.

7. The feedback resource determination method as described in claim 6, characterized in that, The third indication information is used to indicate the time domain offset corresponding to each of the plurality of component carriers. The time domain offset corresponding to a component carrier is used to determine the time slot where the PSFCH symbol for HARQ feedback is located.

8. The feedback resource determination method as described in claim 7, characterized in that, The target PSFCH symbol includes two PSFCH symbols.

9. A method for determining feedback resources, characterized in that, include: Receive first indication information, the first indication information is used to indicate multiple physical resource blocks (PRBs), the multiple PRBs are multiple PRBs on the target physical direct link feedback channel (PSFCH) symbol, the multiple PRBs are used to perform hybrid automatic repeat request (HARQ) feedback for side-line data transmission on the transmission resources of multiple component carriers, and the target PSFCH symbol is an orthogonal frequency division multiplexing (OFDM) symbol on the first component carrier among the multiple component carriers; Based on the first indication information, HARQ feedback is performed on the side-row data transmission on the transmission resources of the multiple component carriers using the multiple PRBs; Before performing HARQ feedback on side-line data transmission on the transmission resources of the multiple component carriers using the multiple PRBs, the method further includes: mapping the transmission resources on the multiple component carriers to the PRBs used for HARQ feedback on the target PSFCH symbol according to the first indication information; The first indication information includes at least one PRB set parameter, which is used to indicate the plurality of PRBs; the at least one PRB set parameter is a plurality of PRB set parameters that correspond one-to-one with the plurality of component carriers, and the PRB set parameter corresponding to a component carrier is used to indicate the PRB for HARQ feedback corresponding to that component carrier.

10. The feedback resource determination method as described in claim 9, characterized in that, The step of mapping the transmission resources on the plurality of component carriers to the PRBs used for HARQ feedback on the target PSFCH symbol according to the first indication information includes: Based on the first indication information and the predetermined mapping rules, the transmission resources on the plurality of component carriers are mapped to the PRBs used for HARQ feedback on the target PSFCH symbol.

11. The feedback resource determination method as described in claim 10, characterized in that, The predetermined mapping rule is as follows: for transmission resources with larger sub-channel indices, the corresponding PRB index is larger; for transmission resources with the same sub-channel index, the transmission resource with a smaller time slot index has a smaller PRB index.

12. The feedback resource determination method as described in claim 9, characterized in that, The PRB set parameters are configured in bitmap form, and the number of bits contained in the PRB set parameters is equal to the number of PRBs on the target PSFCH symbol.

13. The feedback resource determination method as described in any one of claims 9-12, characterized in that, The number of PRBs used for HARQ feedback corresponding to each transmission resource on each component carrier is N / M, where N is the number of the multiple PRBs and M is the total number of transmission resources used for HARQ feedback on the multiple component carriers using the target PSFCH symbol; the transmission resource occupies one time slot in the time domain and one sub-channel in the frequency domain.

14. The feedback resource determination method as described in claim 13, characterized in that, If the first sub-channel width cannot ensure that the ratio of the number of the plurality of PRBs to the number of transmission resources on the plurality of component carriers is a positive integer, the method further includes: Receive second indication information, the second indication information being used to indicate a second sub-channel width for the resource pool used for the current communication, the second sub-channel width being such that the ratio of the number of the plurality of PRBs to the number of transmission resources on the plurality of component carriers is a positive integer; the first sub-channel width is the sub-channel width of the resource pool configured for the receiving end user equipment before configuring the second sub-channel width of the resource pool; The width of the sub-channel of the resource pool is determined as the second sub-channel width based on the second indication information.

15. The feedback resource determination method as described in claim 14, characterized in that, The target PSFCH symbol includes multiple PSFCH symbols, and the method further includes: Receive third indication information, the third indication information being used to indicate the target PSFCH symbol; Based on the third indication information, the PSFCH symbols for HARQ feedback used for side-line data transmission corresponding to the plurality of component carriers are determined.

16. The feedback resource determination method as described in claim 15, characterized in that, The third indication information is used to indicate the time domain offset corresponding to each of the plurality of component carriers. The time domain offset corresponding to a component carrier is used to determine the time slot where the PSFCH symbol for HARQ feedback is located.

17. The feedback resource determination method as described in claim 16, characterized in that, The target PSFCH symbol includes two PSFCH symbols.

18. A feedback resource determination device, characterized in that, include: A transmitting unit is configured to transmit first indication information, which indicates multiple Physical Resource Blocks (PRBs). These multiple PRBs are multiple PRBs on a target Physical Through-Link Feedback Channel (PSFCH) symbol. The multiple PRBs are used for Hybrid Automatic Repeat Request (HARQ) feedback of side-line data transmission on transmission resources of multiple component carriers. The target PSFCH symbol is an Orthogonal Frequency Division Multiplexing (OFDM) symbol on a first component carrier among the multiple component carriers. The PRBs used for HARQ feedback corresponding to different component carriers do not overlap. The first indication information includes at least one PRB set parameter, which is used to indicate the plurality of PRBs; one of the PRB set parameters is used to indicate the PRB for HARQ feedback corresponding to different component carriers.

19. A feedback resource determination device, characterized in that, include: The receiving unit is configured to receive first indication information, which indicates multiple physical resource blocks (PRBs). The multiple PRBs are multiple PRBs on the target physical direct link feedback channel (PSFCH) symbol. The multiple PRBs are used to perform hybrid automatic repeat request (HARQ) feedback for side-line data transmission on the transmission resources of multiple component carriers. The target PSFCH symbol is an orthogonal frequency division multiplexing (OFDM) symbol on the first component carrier among the multiple component carriers. The processing unit is configured to perform HARQ feedback on the side-row data transmission on the transmission resources of the multiple component carriers using the multiple PRBs according to the first indication information. Before performing HARQ feedback on side-line data transmission on the transmission resources of the multiple component carriers using the multiple PRBs, the method further includes: mapping the transmission resources on the multiple component carriers to the PRBs used for HARQ feedback on the target PSFCH symbol according to the first indication information; The first indication information includes at least one PRB set parameter, which is used to indicate the plurality of PRBs; the at least one PRB set parameter is a plurality of PRB set parameters that correspond one-to-one with the plurality of component carriers, and the PRB set parameter corresponding to a component carrier is used to indicate the PRB for HARQ feedback corresponding to that component carrier.

20. A computer-readable storage medium, wherein the computer-readable storage medium is a non-volatile storage medium or a non-transient storage medium, and a computer program is stored thereon, characterized in that, When the computer program is run by the processor, the steps of the feedback resource determination method according to any one of claims 1-17 are executed.

21. A feedback resource determination apparatus, comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, characterized in that, When the processor runs the computer program, it performs the steps of the feedback resource determination method according to any one of claims 1-17.

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