Method and apparatus for transmitting and receiving sidelink feedback information

Abstract

In the embodiment of the present invention, a method and an apparatus for transmitting and receiving sidelink feedback information are provided. For a HARQ-ACK retransmission from a first device to a network device, if the first device has already transmitted a PSCCH and / or a PSSCH associated with the HARQ-ACK to a second device but has not received sidelink feedback information that needs to be carried by a PUCCH, the first device will not transmit the PUCCH to the network device, thereby reducing or avoiding unnecessary occupation of unlicensed frequency bands, and notifying the network device of the schedule for HARQ-ACK retransmission. In addition, for a HARQ-ACK retransmission from a second device to a first device, the size of the HARQ-ACK codebook is additionally used to determine a PSFCH resource, thereby avoiding the occurrence of PSFCH resource collision in groupcast HARQ-ACK retransmission.

Description

[Technical Field]

[0001] The present invention relates to the field of communications. [Background technology]

[0002] 3GPP (registered trademark) is standardizing how to use unlicensed frequency bands for the Uu interface. 5G NR standardization work mainly includes the Release 16 NR-U project and the ongoing Release 17 52.6 GHz to 71 GHz project. Technically, the use of unlicensed frequency bands can increase the available frequency spectrum resources for the Uu interface, and these additional frequency spectrum resources are advantageous for improving data rates (or throughput), improving reliability, reducing time delays, and so on. Application-wise, unlicensed and licensed frequency bands can be jointly deployed, licensed frequency bands can be used to supplement the use of unlicensed frequency bands, or unlicensed frequency bands can be deployed independently. Related application scenarios include any scenarios that can coexist with other radio access technologies (e.g., Wi-Fi), IIoT (Industrial IoT) scenarios using unlicensed frequency bands, etc.

[0003] 3GPP has standardized the sidelink, and 5G NR standardization work includes the Release 16 V2X project and the ongoing Release 17 sidelink project. The physical channels defined in Rel-16 NR V2X include the Physical Sidelink Control Channel (PSCCH), the Physical Sidelink Shared Channel (PSSCH), and the Physical Sidelink Feedback Channel (PSFCH). The PSCCH carries the first-stage sidelink control information (SCI), and the first-stage SCI is mainly used for reserved resources. The PSSCH carries the second-stage SCI and transport block (TB), of which the second-stage SCI is mainly used for TB demodulation.

[0004] The PSFCH carries sidelink feedback information (which may be referred to as HARQ-ACK). The PSCCH and PSSCH are generally transmitted in the same slot. One PSCCH / PSSCH is associated with one or more PSFCH resources according to a predetermined rule. After transmitting the PSCCH / PSSCH, a device can receive an acknowledgement (ACK) / negative acknowledgement (NACK) on the associated PSFCH resource. NR V2X can support HARQ-ACK feedback for unicast and groupcast. Groupcast also has two types of HARQ-ACK feedback methods: HARQ Option 1 and HARQ Option 2.

[0005] In the groupcast mode of HARQ option 1, only receiving devices within a predetermined communication range can feed back HARQ-ACK and only NACKs (NACK-only) and the transmitting device does not know which receiving device specifically sent the NACK. In the groupcast mode of HARQ option 2, the PSFCH resources for each receiving device to feed back ACK / NACK are independent and the transmitting device knows which receiving device sent the ACK / NACK.

[0006] The resources (time-frequency resources) used for sidelink transmissions are located in a resource pool. NR V2X defines two working modes. For NR V2X Mode 1, resources for V2X communication of the terminal device are scheduled or configured by the network device (base station) via the NR Uu link. For NR V2X Mode 2, the terminal device can autonomously select time-frequency resources for V2X communication based on sensing results.

[0007] It should be noted that the introduction of the above background art is intended to clearly and completely explain the technical solutions of the present invention and to facilitate understanding by those skilled in the art, and these technical solutions described in the background art of the present invention should not be construed as being known to those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0008] The inventor has found that the Release 18 project is currently under discussion in 3GPP, and SL-U (Sidelink-Unlicensed) is one of the candidates. HARQ-ACK retransmission is also a necessary function for SL-U, so how to support HARQ-ACK retransmission in SL-U remains a problem to be solved.

[0009] In view of at least one of the above problems, embodiments of the present invention provide a method and an apparatus for transmitting and receiving sidelink feedback information. [Means for solving the problem]

[0010] According to an aspect of an embodiment of the present invention, there is provided a method for transmitting sidelink feedback information, the method comprising: When a first device (first terminal device) needs to transmit a physical uplink control channel (PUCCH) to a network device, determining whether sidelink feedback information that needs to be carried by the physical uplink control channel has been received and whether the first device (first terminal device) has already transmitted a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH) associated with the sidelink feedback information to a second device (second terminal device); and The first device not transmitting the Physical Uplink Control Channel (PUCCH) if sidelink feedback information that needs to be carried by the Physical Uplink Control Channel (PUCCH) has not been received and the first device has already transmitted a Physical Sidelink Control Channel (PSCCH) and / or a Physical Sidelink Shared Channel (PSSCH) associated with the sidelink feedback information to the second device.

[0011] According to another aspect of an embodiment of the present invention, there is provided an apparatus for transmitting sidelink feedback information, comprising: a determining unit for determining, when a physical uplink control channel needs to be transmitted to a network device, whether sidelink feedback information that needs to be carried by the physical uplink control channel has been received and whether a second device has already transmitted a physical sidelink control channel and / or a physical sidelink shared channel associated with the sidelink feedback information; and a processing unit for not transmitting the physical uplink control channel if sidelink feedback information that needs to be carried by the physical uplink control channel has not been received and the second device has already transmitted a physical sidelink control channel and / or a physical sidelink shared channel associated with the sidelink feedback information.

[0012] According to another aspect of an embodiment of the present invention, there is provided a method for transmitting sidelink feedback information, the method comprising: The second device receives a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH) transmitted by the first device; and the second device transmitting a plurality of sidelink feedback information to the first device; Wherein, the physical sidelink feedback channel (PSFCH) resources of the plurality of sidelink feedback information are determined by at least the number of the plurality of sidelink feedback information.

[0013] According to another aspect of an embodiment of the present invention, there is provided an apparatus for transmitting sidelink feedback information, comprising: a receiving unit for receiving a physical sidelink control channel and / or a physical sidelink shared channel transmitted by the first device; and a transmitting unit for transmitting a plurality of sidelink feedback information to the first device; Wherein, the physical sidelink feedback channel resources of the plurality of sidelink feedback information are determined by at least the number of the plurality of sidelink feedback information.

[0014] According to another aspect of an embodiment of the present invention, there is provided a communication system, the communication system including a first device and / or a second device, when the first device needs to transmit a physical uplink control channel to a network device, determining whether sidelink feedback information that needs to be carried by the physical uplink control channel has been received and whether the first device has already transmitted a physical sidelink control channel and / or a physical sidelink shared channel associated with the sidelink feedback information to a second device; and when the first device has not received sidelink feedback information that needs to be carried by the physical uplink control channel and has already transmitted a physical sidelink control channel and / or a physical sidelink shared channel associated with the sidelink feedback information to the second device, not transmitting the physical uplink control channel; The second device receives a physical sidelink control channel and / or a physical sidelink shared channel transmitted by the first device; and transmits a plurality of sidelink feedback information to the first device, in which physical sidelink feedback channel resources of the plurality of sidelink feedback information are determined at least by the number of the plurality of sidelink feedback information. [Effects of the Invention]

[0015] The advantageous effects of the embodiments of the present invention are at least as follows: for a HARQ-ACK retransmission from a first device to a network device, if the first device has already transmitted a PSCCH and / or PSSCH associated with the HARQ-ACK to a second device but has not received sidelink feedback information that needs to be carried by a PUCCH (i.e., the PUCCH does not contain a valid HARQ-ACK bit), the first device does not transmit the PUCCH to the network device, thereby reducing or avoiding unnecessary occupation of unlicensed frequency bands and notifying the network device of the scheduling of the HARQ-ACK retransmission. Also, for a HARQ-ACK retransmission from the second device to the first device, the size of the HARQ-ACK codebook is additionally used to determine the PSFCH resource, thereby avoiding PSFCH resource collisions in groupcast HARQ-ACK retransmissions.

[0016] The following description and reference to the drawings disclose in detail particular embodiments of the present invention and show how the principles of the present invention may be employed, but the present invention is not limited in scope to these embodiments, which may include various changes, modifications, and alternatives within the scope of the appended claims.

[0017] Additionally, features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, may be combined with features in the other embodiments, or may be substituted for features in the other embodiments.

[0018] It should be noted that when used in this specification, terms such as "comprise / have" refer to the presence of a feature, element, step, or assembly, but do not exclude the presence or addition of one or more other features, elements, steps, or assemblies. [Brief explanation of the drawings]

[0019] Elements and features described in one drawing or one embodiment of the invention may be combined with elements and features shown in one or more other drawings or embodiments, and in the drawings, like reference numerals are used to indicate corresponding parts in several drawings and to indicate corresponding parts used in several embodiments. [Figure 1] 1 is a diagram illustrating a communication system according to an embodiment of the present invention. [Figure 2] A figure showing an example of HARQ-ACK retransmission in NR-U. [Figure 3] FIG. 1 is a diagram illustrating an example of resource allocation in Mode 1 in NR V2X. [Figure 4] FIG. 1 illustrates a method for transmitting sidelink feedback information in an embodiment of the present invention. [Figure 5] FIG. 10 illustrates an example of sidelink feedback information according to an embodiment of the present invention. [Figure 6] FIG. 10 illustrates another example of sidelink feedback information according to an embodiment of the present invention. [Figure 7] FIG. 10 is another diagram illustrating a method for transmitting sidelink feedback information in an embodiment of the present invention. [Figure 8] FIG. 10 illustrates another example of sidelink feedback information according to an embodiment of the present invention. [Figure 9] FIG. 10 illustrates another example of sidelink feedback information according to an embodiment of the present invention. [Figure 10] FIG. 1 illustrates a sidelink feedback information transmitting device according to an embodiment of the present invention. [Figure 11] FIG. 10 is another diagram illustrating a sidelink feedback information transmitting device according to an embodiment of the present invention. [Figure 12] FIG. 1 illustrates a network device according to an embodiment of the present invention. [Figure 13] FIG. 2 is a diagram illustrating a terminal device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0020] The foregoing and other features of the present invention will become more apparent from the following detailed description and the accompanying drawings, in which: While the specification and drawings disclose particular embodiments of the present invention, these illustrate only some of the embodiments which may employ the principles of the present invention, and it is to be understood that the present invention is not limited to the described embodiments, but rather includes all modifications, variations, and alternatives which fall within the scope of the appended claims.

[0021] In embodiments of the present invention, the term "communication network" or "wireless communication network" may refer to a network conforming to any communication standard, such as LTE (Long Term Evolution), LTE-A (LTE-Advanced), WCDMA (Wideband Code Division Multiple Access), HSPA (High-Speed ​​Packet Access), etc.

[0022] Additionally, communications between devices in a communications system may occur according to any level of communications protocol, including, but not limited to, 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, 5G, New Radio (NR), and / or other conventional or future-developed communications protocols.

[0023] In the embodiments of the present invention, the term "network device" refers to a device that connects a terminal device to a communication network and provides services to the terminal device, for example, in a communication system. The network device may include, but is not limited to, a base station (BS), an access point (AP), a transmission reception point (TRP), a broadcast transmitter, a mobile management entity (MME), a network gateway, a server, a radio network controller (RNC), a base station controller (BSC), etc.

[0024] The base station may include, but is not limited to, a Node B (NodeB or NB), an evolved Node B (eNodeB or eNB), a 5G base station (gNB), etc., and may further include a Remote Radio Head (RRH), a Remote Radio Unit (RRU), a relay, or a low-power node (e.g., femto, pico, etc.). The term "base station" may include some or all of the functions thereof, and each base station can provide communication coverage for a specific geographic area. The term "cell" may refer to a base station and / or the area it covers, depending on the context of the term.

[0025] In embodiments of the present invention, the term "User Equipment" (UE) or "Terminal Equipment" (TE) refers to a device that accesses a communication network and receives services from the network, for example, via a network device. A User Equipment may be fixed or mobile, and may also be referred to as a Mobile Station (MS), a terminal, a Subscriber Station (SS), an Access Terminal (AT), a station, etc.

[0026] Among these, user devices may include, but are not limited to, cellular phones, personal digital assistants (PDAs), wireless modems, wireless communication devices, mobile devices, machine-type communication devices, laptop computers, cordless phones, smartphones, smart watches, digital cameras, etc.

[0027] Also, for example, in scenarios such as the Internet of Things (IoT), the user equipment may be a device or equipment that further performs monitoring or measurement, for example, but is not limited to, a Machine Type Communication (MTC) terminal, an in-vehicle communication terminal, a Device to Device (D2D) terminal, a Machine to Machine (M2M) terminal, etc.

[0028] Furthermore, the term "network side" or "network device side" refers to the network side, or may be a base station, or may be one or more network devices as described above. The term "user side" or "terminal side" or "terminal device side" refers to the user or terminal side, or may be a UE, or may be one or more terminal devices as described above. Herein, unless otherwise specified, "device" may refer to a network device or may refer to a terminal device.

[0029] The following describes a scenario in an embodiment of the present invention through an example, but the present invention is not limited thereto.

[0030] Fig. 1 is a diagram showing a communication system in an embodiment of the present invention, taking a terminal device and a network device as an example. As shown in Fig. 1, a communication system 100 may include a network device 101 and terminal devices 102 and 103. For convenience, Fig. 1 uses two terminal devices and one network device as an example for explanation, but the embodiment of the present invention is not limited to this.

[0031] In an embodiment of the present invention, existing services or future services can be performed between the network device 101 and the terminal devices 102 and 103. For example, these services include, but are not limited to, enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra-Reliable and Low-Latency Communication (URLLC).

[0032] 1 shows that both of the two terminal devices 102 and 103 are located within the coverage of the network device 101, but the present invention is not limited to this. Neither of the two terminal devices 102 and 103 may be located within the coverage of the network device 101, or one terminal device 102 may be located within the coverage of the network device 101 and the other terminal device 103 may be located outside the coverage of the network device 101.

[0033] In an embodiment of the present invention, sidelink transmission may be performed between two terminal devices 102 and 103. For example, the two terminal devices 102 and 103 may all perform sidelink transmission within the coverage of the network device 101 to realize V2X communication, or all perform sidelink transmission outside the coverage of the network device 101 to realize V2X communication, or one terminal device 102 may be located within the coverage of the network device 101 and the other terminal device 103 may be located outside the coverage of the network device 101, and both devices may perform sidelink transmission to realize V2X communication.

[0034] To avoid interfering with other coexisting radio access technologies, the use of unlicensed frequency bands must comply with relevant regulations, which stipulate transmission power, occupied bandwidth, channel occupancy time (COT), channel access mechanism, etc.

[0035] Taking channel access mechanisms as an example, LBT (Listen Before Talk) is an important method when using unlicensed frequency bands. In NR-U, a device (base station or terminal device) can transmit using unlicensed frequency bands only if the LBT is successful. If the LBT fails, the device cannot transmit using unlicensed frequency bands. An LBT failure may affect some existing procedures in NR Uu, such as the HARQ feedback procedure in NR. Specifically, an LBT failure may cause the device not to feed back HARQ-ACK to the base station, or the device may not feed back HARQ-ACK to the base station because the HARQ-ACK feedback opportunity (timing) cannot be within the current COT.

[0036] NR-U has enhanced the HARQ procedure, including the introduction of an enhanced Type-2 HARQ-ACK codebook, which supports grouping of the original Type-2 HARQ-ACK codebook and retransmission of HARQ-ACK bits. For details about the enhanced Type-2 HARQ-ACK codebook, see Section 9.1.3.3 of the TS 38.213 standard.

[0037] 2 is a diagram showing an example of HARQ-ACK retransmission in NR-U, and illustrates HARQ-ACK retransmission in NR-U. For convenience, the example is explained using one carrier (or cell), but it can be easily extended to a carrier aggregation scenario. The DCI includes a "PDSCH group index" field (G), a DAI field (C-DAI / T-DAI), a "new feedback indicator" field (F), and a "number of requested PDSCH group(s)" field (R). G indicates which group the current PDSCH and associated HARQ-ACK belong to, and there are two groups for selection in total; DAI counts within the group, and the counting method is the same as that of the existing Type-2 HARQ-ACK codebook; F indicates whether to clear the previous HARQ-ACK and DAI of the group, and inverting the F value indicates clearing; R indicates which group of HARQ-ACK to feed back, with R=0 indicating feeding back the HARQ-ACK of the group scheduled by the current DCI, and R=1 indicating feeding back two groups of HARQ-ACK.

[0038] As shown in Figure 2, the base station transmits a PDSCH to the device, and within COT1, it schedules TB1 using DCI 1 and schedules TB2 using DCI 2, and instructs the device to feedback a HARQ-ACK codebook including HARQ-ACK1 and HARQ-ACK2 in PUCCH 1. The base station schedules TB3 using DCI 3, and considering that the device does not have time to feedback HARQ-ACK3 within the current COT1, the base station indicates a non-numeric value in the "HARQ feedback timing" field to instruct the device to temporarily not feedback HARQ-ACK3. The base station can achieve the above objective by grouping (G).

[0039] Due to the LBT failure, the device does not transmit HARQ-ACK 1 and HARQ-ACK 2 on PUCCH 1. Until now, the base station has not received HARQ-ACK 1 to HARQ-ACK 3 within COT 1. However, the base station can later schedule the device to retransmit HARQ-ACK 1 to HARQ-ACK 3.

[0040] The base station schedules TB 4 using DCI 4 in COT 2, instructing the device to feed back HARQ-ACKs for two sets, i.e., HARQ-ACK 1 to HARQ-ACK 4. Although the device did not have an opportunity to transmit HARQ-ACK 1 to HARQ-ACK 3 before, when the base station schedules the device to feed back HARQ-ACK 4, the base station also schedules the device to retransmit HARQ-ACK 1 to HARQ-ACK 3, thereby realizing HARQ-ACK retransmission.

[0041] In addition, NR V2X defines two working modes, Mode 1 and Mode 2.

[0042] FIG. 3 illustrates an example of resource allocation in Mode 1 for NR V2X. This section provides an exemplary description of the resource allocation method in Mode 1. As shown in FIG. 3, a network device (gNB) allocates resources for a transmitting device (TX UE) using DCI. The TX UE transmits a PSCCH / PSSCH to a receiving device (RX UE) using the allocated resources and receives a PSFCH carrying a sidelink HARQ-ACK for the RX UE transmission. The TX UE transmits a sidelink HARQ-ACK to the gNB via a PUCCH. The DCI and PUCCH are transmitted via the Uu interface, and the PSSCH and PSFCH are transmitted via the sidelink PC5 interface. According to the standard, if the TX UE does not receive the PSFCH, it feeds back a NACK to the gNB.

[0043] 3GPP is currently discussing the Release 18 project, with SL-U (Sidelink-Unlicensed) being one of the candidates. SL-U uses unlicensed frequency bands for sidelink communication, i.e., device-to-device communication. SL-U can further reduce time delays through direct device-to-device communication. Similarly, SL-U can also improve the data rate and reliability of sidelink transmissions by utilizing additional frequency spectrum. Interesting application scenarios include Network Controlled Interactive Services (NCIS), Industrial Internet of Things (IIoT), V2X, and smart homes.

[0044] For now, 3GPP is mainly discussing the necessity and possible research content of the SL-U project, but has not gone into technical details. As mentioned above, existing standards support Uu interface-based communication in unlicensed frequency bands, i.e., communication between base stations and devices. 3GPP is also standardizing sidelink communication using licensed frequency bands.

[0045] However, the technical details of SL-U, which uses unlicensed frequency bands for sidelink communication, have not been discussed in 3GPP. HARQ-ACK retransmission is also a necessary function for SL-U, and how to support HARQ-ACK retransmission in SL-U remains a problem to be solved. This complexity is further reflected in the sidelink Mode 1 resource allocation, where not only does the TX UE need to retransmit the sidelink HARQ-ACK to the base station, but the RX UE also needs to request or trigger the TX UE to retransmit the sidelink HARQ-ACK. Achieving such dual HARQ-ACK retransmission requires a new method, and existing HARQ-ACK retransmission methods cannot be directly applied to SL-U.

[0046] In the following description, the term "sidelink" is interchangeable with "V2X", the term "PSFCH" is interchangeable with "sidelink feedback channel", the term "PSCCH" is interchangeable with "sidelink control channel" or "sidelink control information", and the term "PSSCH" is also interchangeable with "sidelink data channel" or "sidelink data", unless this would cause confusion.

[0047] Furthermore, transmitting or receiving a PSCCH may be understood as transmitting or receiving sidelink control information carried by the PSCCH, transmitting or receiving a PSSCH may be understood as transmitting or receiving sidelink data carried by the PSSCH, and transmitting or receiving a PSFCH may be understood as transmitting or receiving sidelink feedback information carried by the PSFCH. Sidelink transmission may be understood as transmitting a PSCCH / PSSCH or transmitting sidelink data / information.

[0048] In the embodiments of the present invention, the first device refers to a sidelink transmitting device, the second device refers to a sidelink receiving device, the HARQ-ACK retransmission refers to the retransmission of HARQ-ACK bits, the HARQ-ACK is the HARQ-ACK for the PSCCH / PSSCH, and the PSCCH / PSSCH may be abbreviated as PSSCH, and the SCI may refer to the 1st stage SCI and / or the 2nd stage SCI, but the present invention is not limited thereto. In an embodiment of the present invention, the first device receives a sidelink HARQ-ACK (one or more HARQ-ACK bits) from the second device, and determines feedback information (e.g., HARQ-ACK) to be transmitted to a network device (base station) via a PUCCH based on the sidelink HARQ-ACK from the second device. The process of determining the feedback information to be transmitted to the network device (base station) may comply with existing standards, for which reference may be made to Section 16.5 of TS 38.213. In the embodiment of the present invention, "feedback information to be carried by a PUCCH has not been received by the first device" refers to "the associated sidelink HARQ-ACK from the second device has not been received by the first device."

[0049] Hereinafter, each embodiment of the present application will be described with reference to the accompanying drawings. Note that these embodiments are merely illustrative and do not limit the present invention.

[0050] <Example of the first aspect> An embodiment of the present invention provides a method for transmitting and receiving sidelink feedback information, which is described from a first device and a network device.

[0051] 4 is a diagram illustrating a method for transmitting sidelink feedback information according to an embodiment of the present invention. As shown in FIG. 4, the method includes the following steps:

[0052] 401: When a first device needs to transmit a physical uplink control channel (PUCCH) to a network device, determine whether sidelink feedback information that needs to be carried by the physical uplink control channel has been received and whether the first device has already transmitted a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH) associated with the sidelink feedback information to a second device; and 402: If sidelink feedback information that needs to be carried by the physical uplink control channel has not been received and the first device has already transmitted a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH) associated with the sidelink feedback information to a second device, the first device does not transmit the physical uplink control channel (PUCCH).

[0053] Note that the above-described FIG. 4 is used to exemplify an embodiment of the present invention, but the present invention is not limited thereto. For example, the execution order of each operation may be appropriately adjusted, or some other operations may be added or removed. Those skilled in the art may make appropriate modifications based on the above content without being limited to the description of the above-described FIG. 4.

[0054] In some embodiments, the first device transmits a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH) to the second device.

[0055] In some embodiments, the first device does not transmit the physical uplink control channel (PUCCH) if all sidelink feedback information that needs to be carried by the physical uplink control channel has not been received and the first device has already transmitted to the second device a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH) associated with all the sidelink feedback information.

[0056] In some embodiments, the first device does not transmit the Physical Uplink Control Channel (PUCCH) if the number or percentage of unreceived sidelink feedback information among the plurality of sidelink feedback information to be carried by the Physical Uplink Control Channel (PUCCH) is greater than a configured or pre-configured threshold and the first device has already transmitted to the second device a Physical Sidelink Control Channel (PSCCH) and / or a Physical Sidelink Shared Channel (PSSCH) associated with the plurality of sidelink feedback information.

[0057] In some embodiments, when a first device needs to transmit a physical uplink control channel (PUCCH) to a network device, it determines whether sidelink feedback information that needs to be carried by the physical uplink control channel is valid or a padding bit, and if the sidelink feedback information that needs to be carried by the physical uplink control channel is invalid or a padding bit, the first device does not transmit the physical uplink control channel (PUCCH).

[0058] In some embodiments, the first device determines that the sidelink feedback information is invalid or padding bits if the sidelink feedback information has not been received and the first device has already transmitted a Physical Sidelink Control Channel (PSCCH) and / or a Physical Sidelink Shared Channel (PSSCH) associated with the sidelink feedback information to the second device.

[0059] In some embodiments, if all sidelink feedback information that needs to be carried by the physical uplink control channel is invalid or is padding bits, the first device does not transmit the physical uplink control channel (PUCCH).

[0060] In some embodiments, the first device does not transmit the physical uplink control channel (PUCCH) if the number or percentage of invalid sidelink feedback information or padding bits among the plurality of sidelink feedback information that need to be carried by the physical uplink control channel is greater than a configured or pre-configured threshold.

[0061] 5 is a diagram illustrating an example of sidelink feedback information according to an embodiment of the present invention. As shown in FIG. 5, a network device (base station) uses DCI to allocate resources for PSSCH transmission for device 1 (first device or transmitting device) and indicate PUCCH resources for sidelink HARQ-ACK transmission. The PSSCH resources are located in unlicensed frequency bands, the DCI may be transmitted in unlicensed frequency bands or licensed frequency bands, and the PUCCH may be transmitted in unlicensed frequency bands or licensed frequency bands.

[0062] The following description will be given from the base station side. DCI1 and DCI2 indicate set 0 (G=0) and the C-DAI and T-DAI counted within set 0, and also indicate that device 1 should feed back HARQ-ACKs for set 0, i.e., HARQ-ACK1 and HARQ-ACK2, on PUCCH1. DCI3 indicates set 1 (G=1) and the C-DAI and T-DAI counted within set 1. Considering that device 1 does not have time to feed back HARQ-ACK3 for DCI3 (or TB3) within COT1 (or PUCCH1), DCI3 indicates that device 1 should temporarily not feed back HARQ-ACK3.

[0063] The following description will be given from the device 1 side. Device 1 transmits TB1 and TB2 using resources allocated by DCI1 and DCI2. In order to transmit HARQ-ACK1 and HARQ-ACK2 for TB1 and TB2 to the base station on PUCCH1, device 1 needs to obtain HARQ-ACK1 and HARQ-ACK2 from device 2 (the second device or receiving device) before time t1. However, device 1 may not have received HARQ-ACK1 and HARQ-ACK2 before t1. In such a case, device 1 does not transmit PUCCH1. Therefore, the base station cannot receive HARQ-ACK1 and HARQ-ACK2 on PUCCH1. Therefore, the base station selectively schedules device 1 to retransmit HARQ-ACK1 and HARQ-ACK2 (to the base station) in the next COT (COT2), but does not need to schedule device 1 to retransmit TB1 and TB2 (to device 2). For example, the base station uses DCI4 to allocate resources for transmitting TB4 for device 1, and at the same time, DCI4 instructs device 1 to feed back HARQ-ACKs for sets 0 and 1, i.e., HARQ-ACK1 to HARQ-ACK4, on PUCCH2, thereby realizing retransmission of HARQ-ACK1 and HARQ-ACK2. To obtain HARQ-ACK1 and HARQ-ACK2, device 1 does not retransmit TB1 and TB2, but instructs device 2 to retransmit HARQ-ACK1 and HARQ-ACK2. For example, device 1 instructs device 2 to retransmit the HARQ-ACK using a method similar to the method by which the base station schedules device 1 to retransmit the HARQ-ACK. After receiving DCI4, device 1 instructs device 2 to retransmit HARQ-ACK1 and HARQ-ACK2 via SCI. Device 1 indicates parameters such as G and SAI in the SCI, which may be determined independently and may be the same as or different from the parameters indicated by the base station via DCI. Not retransmitting TB1 and TB2 reduces the occupancy of the unlicensed frequency band and reduces interference to other devices using the unlicensed frequency band.In addition, when the PUCCH is located in an unlicensed frequency band, device 1 not transmitting PUCCH1 can also reduce occupancy of the unlicensed frequency band and reduce interference to other devices using the unlicensed frequency band.

[0064] For convenience, Figure 5 only shows the "group index" field (G) and the DAI field (C-DAI / T-DAI) in the DCI, but to realize the HARQ-ACK retransmission function, the DCI may further include other fields, such as a "new feedback indicator" field and a "number of requested group(s)" field, and the usage of these omitted fields is the same as that in the existing NR-U standard.

[0065] 6 is a diagram illustrating another example of sidelink feedback information in an embodiment of the present invention, illustrating a case where a conventional scheme is used (as is). As shown in FIG. 6, if device 1 does not receive HARQ-ACK1 and HARQ-ACK2, it can transmit NACK1 and NACK2 to the base station, i.e., fill NACK. After receiving NACK1 and NACK2, the base station determines that the device has failed in demodulation and decoding, and continues to schedule device 1 to retransmit TB1 and TB2, but does not schedule device 1 to retransmit HARQ-ACK1 and HARQ-ACK2. Retransmission of TB1 and TB2 may occupy additional unlicensed frequency bands, reduce resource utilization, and cause interference to other devices.

[0066] Therefore, compared with transmitting a NACK on PUCCH1, not transmitting PUCCH1 actually corresponds to transmitting additional status information different from an ACK and a NACK to the base station, based on which the base station can only schedule HARQ-ACK retransmissions and not schedule PSSCH retransmissions, thereby reducing the occupation of unlicensed frequency bands.

[0067] FIG. 5 shows an exemplary explanation using the example that PUCCH1 includes HARQ-ACK1 and HARQ-ACK2, but in reality, PUCCH1 may include only one HARQ-ACK or may include more HARQ-ACKs, and the embodiments of the present invention are not limited thereto.

[0068] In the embodiment of the present invention, the reason why device 1 does not receive HARQ-ACK (e.g., HARQ-ACK 1 and HARQ-ACK 2) is not limited. For example, device 2 cannot send HARQ-ACK to device 1 due to LBT failure. For example, device 2 needs to simultaneously transmit or receive other signals with higher priority, and according to the priority rule, device 2 does not send HARQ-ACK to device 1. For example, device 2 sends HARQ-ACK to device 1, but device 1 needs to simultaneously transmit other signals with higher priority, and according to the priority rule, device 1 does not receive the HARQ-ACK sent by device 2.

[0069] When the PUCCH is located in an unlicensed frequency band, device 1 not transmitting PUCCH1 may include the following actions: For example, device 1 not performing LBT on PUCCH1; or, for example, device 1 successfully performs LBT on PUCCH1 but still does not transmit PUCCH1.

[0070] In some embodiments, if the first device does not transmit the PSCCH and / or PSSCH to the second device due to an LBT failure, the first device transmits non-acknowledgement (NACK) information to the network device.

[0071] In one implementation manner, in other cases than the above case, when the first device does not receive the HARQ-ACK, the first device sends a NACK to the base station.

[0072] In one implementation, when the first device does not transmit a PSSCH due to an LBT failure, the first device transmits a NACK to the base station.

[0073] For example, when the first device does not transmit a PSSCH to the second device due to an LBT failure, this includes not transmitting the PSSCH on resources scheduled by the DCI, and also includes not transmitting the PSSCH on resources in a configured grant. At this time, the first device cannot receive a HARQ-ACK from the second device. In this case, the first device transmits a NACK to the base station. After receiving the NACK, the base station can continue to allocate resources for the first device, and the first device can continue to receive the PSSCH on the allocated resources.

[0074] In one implementation manner, in cases other than the above where the first device does not receive HARQ-ACK, when the number or proportion of unreceived HARQ-ACKs is greater than a certain threshold, the first device does not transmit PUCCH; otherwise, the first device fills in the unreceived HARQ-ACKs as NACKs.

[0075] For example, if the first device receives only a portion of all HARQ-ACK bits carried by the PUCCH, and the number of unreceived HARQ-ACK bits is greater than a certain threshold, or if the proportion of unreceived HARQ-ACK bits to all HARQ-ACK bits is greater than a certain threshold, the first device does not transmit PUCCH; otherwise, the first device fills in the unreceived HARQ-ACK as a NACK. Here, "greater than" may be replaced with "greater than or equal to." The threshold may be configured or preset.

[0076] In some embodiments, the network device is configured to transmit the information instructing it to retransmit the sidelink feedback information if it does not receive the physical uplink control channel, and the first device is configured to trigger a retransmission of the sidelink feedback information if it receives the information instructing it to retransmit the sidelink feedback information.

[0077] In some embodiments, the first device is enabled to retransmit sidelink feedback information to the network device and the second device is enabled to retransmit sidelink feedback information to the first device.

[0078] That is, optionally, the first device's action of not transmitting PUCCH must satisfy the following conditions: the first device is enabled to retransmit HARQ-ACK to the base station, and the second device is enabled to retransmit HARQ-ACK to the first device.

[0079] A device needs to have a certain capability to support retransmission of the HARQ-ACK bit. For example, in Fig. 5, device 1 needs to have the capability to temporarily store HARQ-ACK3 and retransmit HARQ-ACK3 at a future time. Also, for example, in Fig. 5, after device 1 receives DCI 4, device 2 may instruct device 2 to retransmit HARQ-ACK1 and HARQ-ACK2, so device 2 needs to have the capability to store the results of HARQ-ACK1 and HARQ-ACK2 before that.

[0080] Equivalently, the capability to support HARQ-ACK retransmission may be referred to as the capability to support an enhanced HARQ-ACK codebook. For example, as shown in Figure 5, the retransmitted HARQ-ACK bits are transmitted to the base station in the form of a HARQ-ACK codebook. Unless otherwise confused, this will be abbreviated as capability hereinafter.

[0081] Since the capability of HARQ-ACK retransmission can be mutually supported between devices and / or between devices and a base station, the base station can enable the first device to perform HARQ-ACK retransmission by configuration, and / or the first device can enable the second device to perform HARQ-ACK retransmission by configuration.

[0082] In some embodiments, the first device transmits to the network device capability information indicating whether the first device can support retransmission of sidelink feedback information and / or capability information indicating whether the second device can support retransmission of sidelink feedback information.

[0083] In some embodiments, the first device receives, from the network device, indication information for enabling the first device to perform retransmission of the sidelink feedback information.

[0084] In some embodiments, the first device receives capability information from the second device transmitting whether the second device can support retransmission of sidelink feedback information.

[0085] In some embodiments, the first device transmits to the second device indication information to enable the second device to retransmit sidelink feedback information.

[0086] For example, the capability interaction and reporting includes an indication of whether the device can support HARQ-ACK retransmission. The setting (or indication information) does not limit the specific manner of enabling HARQ-ACK retransmission. For example, when the parameter HARQ-ACK-Codebook is set in the device and the value of the parameter is set to enhanced, it means that the HARQ-ACK retransmission of the device is enabled.

[0087] The interaction of HARQ-ACK retransmission capability includes at least one of the following ways: The second device reports its capabilities to the first device; and The first device reports its capabilities to the base station.

[0088] The enabling of the HARQ-ACK retransmission function includes at least one of the following ways: The base station enables HARQ-ACK retransmission of the first device; and The first device enables HARQ-ACK retransmission for the second device.

[0089] Embodiments of the present invention may also include any combination of the above approaches.

[0090] For example, the second device reports its ability to support HARQ-ACK retransmission to the first device. If the first device and the second device can both support HARQ-ACK retransmission, the first device reports to the base station that it can support HARQ-ACK retransmission; otherwise, the first device reports to the base station that it cannot support HARQ-ACK retransmission. Note that the first device does not directly report its ability to support HARQ-ACK retransmission to the base station. The base station determines whether to enable HARQ-ACK retransmission for the first device. The first device determines whether to enable HARQ-ACK retransmission for the second device. For example, if the base station enables HARQ-ACK retransmission for the first device, the first device enables HARQ-ACK retransmission for the second device.

[0091] Also, for example, the second device reports its ability to support HARQ-ACK retransmission to the first device. The first device reports the first device's ability to support HARQ-ACK retransmission and the second device's ability to support HARQ-ACK retransmission to the base station. The base station determines whether to enable HARQ-ACK retransmission for the first device. The first device determines whether to enable HARQ-ACK retransmission for the second device. For example, if the base station enables HARQ-ACK retransmission for the first device, the first device enables HARQ-ACK retransmission for the second device.

[0092] Also, for example, the second device reports its ability to support HARQ-ACK retransmission to the first device. The first device reports the first device's ability to support HARQ-ACK retransmission to the base station. The base station determines whether to enable HARQ-ACK retransmission for the first device. The first device determines whether to enable HARQ-ACK retransmission for the second device. For example, if the base station enables HARQ-ACK retransmission for the first device, the first device enables HARQ-ACK retransmission for the second device.

[0093] The above describes an exemplary method for transmitting sidelink feedback information from the perspective of the first device, and the following describes an exemplary method for receiving sidelink feedback information from the perspective of the network device, where the same content as in the previous embodiment will not be described.

[0094] In some embodiments, the network device receives sidelink feedback information carried by the first device via a physical uplink control channel (PUCCH), wherein the physical uplink control channel (PUCCH) is transmitted when the first device determines that the sidelink feedback information that needs to be carried by the physical uplink control channel has already been received.

[0095] In some embodiments, if sidelink feedback information that needs to be carried by a physical uplink control channel (PUCCH) has not been received by the first device and the first device has already transmitted to the second device a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH) associated with the sidelink feedback information, the physical uplink control channel (PUCCH) is not transmitted by the first device.

[0096] In some embodiments, if all sidelink feedback information that needs to be carried by a physical uplink control channel has not been received by the first device and the first device has already transmitted to the second device a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH) associated with all sidelink feedback information, the physical uplink control channel (PUCCH) is not transmitted by the first device.

[0097] In some embodiments, a Physical Uplink Control Channel (PUCCH) is not transmitted by the first device if the number or percentage of sidelink feedback information pieces that have not been received by the first device among the plurality of sidelink feedback information pieces that need to be carried by the Physical Uplink Control Channel (PUCCH) is greater than a configured or pre-configured threshold and the first device has already transmitted to the second device a Physical Sidelink Control Channel (PSCCH) and / or a Physical Sidelink Shared Channel (PSSCH) associated with the plurality of sidelink feedback information pieces.

[0098] In some embodiments, the network device transmits information to the first device to instruct the first device to retransmit the sidelink feedback information if the network device does not receive the physical uplink control channel.

[0099] In some embodiments, the first device is enabled to resend sidelink feedback information to the network device and the second device is enabled to resend sidelink feedback information to the first device.

[0100] In some embodiments, the network device receives capability information from the first device transmitting whether the first device can support retransmission of sidelink feedback information and / or capability information from the second device transmitting whether the second device can support retransmission of sidelink feedback information.

[0101] In some embodiments, the network device may transmit to the first device indication information for enabling the first device to retransmit the sidelink feedback information.

[0102] The above mainly describes the HARQ-ACK interaction between the first device and the network device, but does not limit how the HARQ-ACK between the first device and the second device is interacted.

[0103] The above-described embodiments are merely illustrative of the present invention, and the present invention is not limited thereto. Furthermore, appropriate modifications can be made based on the above-described embodiments. For example, each of the above-described embodiments may be used alone, or a plurality of the above-described embodiments may be used in combination.

[0104] As can be seen from the above embodiments, for a HARQ-ACK retransmission from a first device to a network device, if the first device has already transmitted a PSCCH and / or PSSCH associated with the HARQ-ACK to the second device but has not received sidelink feedback information that needs to be carried by a PUCCH (i.e., the PUCCH does not contain a valid HARQ-ACK bit), the first device will not transmit the PUCCH to the network device, thereby reducing or avoiding unnecessary occupation of unlicensed frequency bands and notifying the network device of the scheduling of the HARQ-ACK retransmission.

[0105] <Example of the second aspect> In the embodiments of the present invention, a method for transmitting and receiving sidelink feedback information is provided, which is described from the perspective of a first device and a second device. The embodiments of the present invention exemplarily describe HARQ-ACK interaction between the first device and the second device, which may be combined with the embodiments of the first aspect or may be implemented independently.

[0106] 7 is a diagram illustrating a method for transmitting sidelink feedback information according to an embodiment of the present invention. As shown in FIG. 7, the method includes the following steps:

[0107] 701: A first device transmits a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH) to a second device; and 702: A first device receives a plurality of sidelink feedback information transmitted by a second device, in which a physical sidelink feedback channel (PSFCH) resource carrying the plurality of sidelink feedback information is determined by at least the number of the plurality of sidelink feedback information.

[0108] Note that the above-mentioned FIG. 7 is used to exemplify an embodiment of the present invention, but the present invention is not limited thereto. For example, the execution order of each operation may be appropriately adjusted, or some other operations may be added or removed. Those skilled in the art may make appropriate modifications based on the above content without being limited to the description of the above-mentioned FIG.

[0109] The first device transmits a TB to the second device on a PSSCH and then receives a HARQ-ACK on a PSFCH resource associated with the PSSCH. In the case of a sidelink unlicensed frequency band, the physical layer structure of the sidelink physical channel and physical signal may change to meet the requirements of related regulations. For example, the existing sidelink PSSCH has a sub-channel granularity and includes contiguous sub-channels over a certain frequency range, while the sidelink unlicensed frequency band PSSCH has an interlace granularity and may include contiguous or discontinuous interlaces over a certain frequency range.

[0110] In the embodiments of the present invention, the physical layer structure is not limited, and the description is made from the logical resource level. Regardless of the physical resource structure, one PSSCH resource can be logically associated with one PSFCH resource. For example, according to the existing standard, the candidate PSFCH resources associated with a certain PSSCH are R PRB,CS PSFCH There are pieces, this R PRB,CS PSFCH Among the candidate PSFCH resources, the index of the PSFCH resource for HARQ-ACK transmission that is finally associated with the PSSCH is (P ID +M ID )mod(RPRB,CS PSFCH ), among which P ID represents the physical layer source ID, and for groupcast with HARQ option 2, M ID represents the ID of the upper layer configuration, which is actually a group member ID. For unicast and groupcast with HARQ option 1, M ID = 0. For more specific parameter definitions and how to determine the PSFCH associated with the PSSCH, see section 16.3 of the standard TS 38.213.

[0111] If the physical layer structure of the PSSCH and PSFCH changes, adaptive extensions can be made to the above method, for example, replacing PSSCH subchannels with PSSCH interlaces, and extending the PSFCH from using only one RB to potentially using multiple RBs. In summary, the above method or extension method allows the R associated with a certain PSSCH to be PRB,CS PSFCH When the second device needs to transmit multiple HARQ-ACK bits, the index of the PSFCH resource for transmitting the multiple HARQ-ACK bits, which is finally associated with the PSSCH, is determined by the (P ID +M ID )mod(R PRB,CS PSFCH ) formula cannot be used directly to determine the

[0112] The following describes the case where the second device needs to transmit multiple HARQ-ACK bits.

[0113] In some cases, the first device transmits one PSSCH but instructs the second device to feed back multiple HARQ-ACK bits. For example, in FIG. 5, the first device transmits TB4 via the PSSCH and simultaneously instructs the second device to feed back four HARQ-ACK bits, including HARQ-ACK retransmissions, via the SCI. For example, the first device transmits PSSCH1 (TB1), but the associated PSFCH slot is outside the current COT, so that the first device instructs the second device to temporarily not feed back HARQ-ACK via the SCI. Alternatively, the second device may autonomously determine not to feed back HARQ-ACK temporarily based on the fact that the PSFCH slot is outside the COT. Thereafter, when the first device transmits PSSCH2 (TB2), it instructs the second device to feed back multiple HARQ-ACK bits, including HARQ-ACK1 for TB1 and HARQ-ACK2 for TB2, via the SCI.

[0114] To enable transmission of multiple HARQ-ACK bits, including HARQ-ACK retransmissions, multiple PSFCH resources need to be determined based on one PSSCH. However, in the prior art, only one PSFCH resource can be determined based on one PSSCH. To address this issue, in an embodiment of the present invention, a physical sidelink feedback channel (PSFCH) resource carrying multiple sidelink feedback information is determined based on at least the number of multiple sidelink feedback information.

[0115] For example, the physical sidelink feedback channel (PSFCH) resource may be determined by the following formula:

[0116] (P ID +M ID Q+q)mod(R PRB,CS SFCH ) Among them, P ID represents the physical layer source ID, and MID where Q is the number of sidelink feedback information pieces, where q=0, 1, ..., Q-1.

[0117] For example, for groupcast with HARQ option 2, M ID represents the ID set in the upper layer, i.e., the group member ID. For unicast, M ID = 0. For groupcast with HARQ option 1, M ID =0.

[0118] In some embodiments, the number of the plurality of sidelink feedback information is determined based on an Assignment Index (AI) field in the sidelink control information sent by the first device to the second device, e.g., the Assignment Index, e.g., referred to as SAI.

[0119] For example, the value of Q can be obtained based on signaling sent from the first device to the second device, for example, based on the C-SAI / T-SAI field in the second stage SCI.

[0120] In some embodiments, the plurality of sidelink feedback information comprises: feedback information for a currently scheduled physical sidelink control channel (PSCCH) and / or physical sidelink shared channel (PSSCH) and / or feedback information for a previously scheduled physical sidelink control channel (PSCCH) and / or physical sidelink shared channel (PSSCH).

[0121] For example, the Q HARQ-ACK bits may include: a HARQ-ACK bit for a currently scheduled PSSCH and / or a HARQ-ACK bit for a previously scheduled PSSCH.

[0122] In some embodiments, the transport blocks (TBs) carried by the currently scheduled physical sidelink control channel (PSCCH) and / or physical sidelink shared channel (PSSCH) are different from the transport blocks (TBs) carried by the previously scheduled physical sidelink control channel (PSCCH) and / or physical sidelink shared channel (PSSCH).

[0123] Taking groupcast with HARQ option 2 as an example, the first device transmits a PSSCH in the form of groupcast, and instructs the second device (member device) to transmit Q HARQ-ACK bits. In the case of groupcast, one first device corresponds to multiple second devices. The Q HARQ-ACK bits include the HARQ-ACK bit for the PSSCH and the HARQ-ACK bit for the retransmission of the previous PSSCH. Member device 0 transmits M ID =0, and member device 1 has M ID =1, and member device 2 has M ID =2 and others can be inferred based on this.

[0124] In the above-mentioned manner, to transmit Q HARQ-ACK bits, each member device transmits Q PSFCHs, and each PSFCH carries one HARQ-ACK bit in the existing manner. The PSFCH resources used by member device 0 are (P ID +q)mod(R PRB,CS PSFCH ), q=0, 1, ..., Q-1, and the PSFCH resource used by member device 1 is (P ID +Q+q)mod(R PRB,CS PSFCH ), q=0, 1, ..., Q-1, and the PSFCH resource used by member device 2 is (P ID +2Q+q)mod(R PRB,CS PSFCH), where q=0, 1, ..., Q-1, and others can be inferred based on this. According to an embodiment of the present invention, the PSFCH resources of different member devices are different from each other.

[0125] Conversely, if the resource for transmitting PSFCH in the existing method is (P ID +M ID )mod(R PRB,CSPSFCH ), the resources for transmitting Q PSFCHs are defined as (P ID +M ID +q)mod(R PRB,CS PSFCH ), the PSFCH resource used by member device 0 is (P ID +q)mod(R PRB,CS PSFCH ), q=0, 1, ..., Q-1, and the PSFCH resource used by member device 1 is (P ID +1+q)mod(R PRB,CS PSFCH ), q=0, 1, ..., Q-1, and the PSFCH resource used by member device 2 is (P ID +2+q)mod(R PRB,CS PSFCH ), where q=0, 1, ..., Q-1, and the others can be inferred based on this. Therefore, as can be seen, different member devices may use the same PSFCH resource to transmit HARQ-ACK, which may cause confusion as the first device may not be able to identify which second device the received HARQ-ACK is from. For example, when Q=3 and q=2, member device 0 uses the PSFCH resource (P ID +2)mod(R PRB,CS PSFCH ), and when q=1, member device 1 uses the PSFCH resource (P ID +2)mod(R PRB,CS PSFCH ), and when q=0, member device 2 uses the PSFCH resource (P ID +2)mod(R PRB,CS PSFCH ), that is, multiple member devices use the same PSFCH resource.

[0126] The above-described method for transmitting Q HARQ-ACK bits by the device is not limited to the application scenario of the sidelink unlicensed frequency band. The same method can also be applied to other scenarios. For example, the above-described method can be applied to a carrier aggregation (CA) scenario. The first device transmits multiple PSSCHs to the second device on multiple carriers in a cross-carrier scheduling manner or a self-scheduling manner, and the second device simultaneously transmits multiple HARQ-ACK bits to the first device in a certain cell (e.g., Pcell).

[0127] Figure 8 illustrates another example of sidelink feedback information in accordance with an embodiment of the present invention, including the complete Uu and sidelink transmission / reception procedures. The top half of Figure 8 shows the Uu procedure, and the bottom half shows the sidelink procedure.

[0128] As shown in Figure 8, the network device (base station) obtains COT1, schedules the first device to transmit TB1 within COT1 (i.e., the base station allocates resource PSSCH1 for the first device and determines that the first device will transmit TB1 on PSSCH1), and instructs the first device to feed back HARQ-ACK1 on PUCCH1. Because the second device's LBT for PSFCH1 fails (the second device cannot transmit PSFCH1), the first device cannot receive HARQ-ACK1 for TB1 on PSFCH1, so the first device does not transmit PUCCH1. The base station schedules the first device to transmit TB2, and because there is not enough time to feed back HARQ-ACK2 for TB2 within COT1, the base station instructs the first device to temporarily not feed back HARQ-ACK2. Because the PSFCH2 associated with TB2 is outside COT1, the first device instructs the second device in SCI2 not to temporarily feed back HARQ-ACK2, or the second device autonomously determines that there is no need to feed back HARQ-ACK2 in PSFCH2 based on the PSFCH2 slot and COT1 time length.

[0129] The base station obtains COT2, schedules the first device to transmit TB3 within COT2, and instructs the first device to feed back HARQ-ACKs for set 0 (G=0) and set 1 (G=1) on PUCCH2, i.e., HARQ-ACK1 to HARQ-ACK3. The first device instructs the second device via SCI3 to feed back HARQ-ACKs for set 0 (G=0) and set 1 (G=1) on PSFCH3 associated with TB3, i.e., HARQ-ACK1 to HARQ-ACK3. The first device receives HARQ-ACK1 to HARQ-ACK3 transmitted by the second device on PSFCH3, and then transmits HARQ-ACK1 to HARQ-ACK3 to the base station on PUCCH2. Here, PSFCH3 refers to all PSFCHs associated with the PSSCH carrying TB3, i.e., PSFCH resources carrying Q HARQ-ACK bits from a certain second device, and the aforementioned method of determining PSFCH resources for Q HARQ-ACK bits can be used. Similar to the way Uu uses DCI, the sidelink can use SCI to indicate G and C-SAI / T-SAI to achieve the purpose of scheduling HARQ-ACK retransmission. For example, in Figure 8, SCI3 indicates that the second device should simultaneously transmit multiple HARQ-ACK bits, including retransmissions for HARQ-ACK1 and HARQ-ACK2.

[0130] In some embodiments, the information instructing grouping and / or retransmission of sidelink feedback information in the sidelink control information (SCI) transmitted from the first device to the second device is independent from the information instructing grouping and / or retransmission of sidelink feedback information in the downlink control information (DCI) transmitted from the network device to the first device.

[0131] 9 illustrates another example of sidelink feedback information according to an embodiment of the present invention, including the complete transmission and reception procedures for Uu and sidelink. The difference from FIG. 8 is that, due to the different PSFCH resources included in the COT, the values ​​of G and C-SAI / T-SAI indicated by the SCI may be different from the values ​​of G and C-DAI / T-DAI indicated by the DCI.

[0132] For convenience, FIG. 9 only shows the "group index" field (G), the DAI field (C-DAI / T-DAI), and the SAI field (C-SAI / T-SAI) in the DCI and SCI. However, to realize the HARQ-ACK retransmission function, the DCI and SCI may further include other fields, such as a "new feedback indicator" field and a "number of requested group(s)" field. Similarly, for these omitted fields, the values ​​in the SCI may be different from those in the DCI. Due to the LBT failure, the second device cannot transmit HARQ-ACK1 on PSFCH1. Therefore, the first device does not transmit PUCCH1. According to G and C-SAI / T-SAI indicated by the SCI, the first device instructs the second device to feedback HARQ-ACK1 and HARQ-ACK2 on PSFCH2 associated with TB2.

[0133] Here, according to an embodiment of the present invention, multiple PSFCH resources for carrying HARQ-ACK1 and HARQ-ACK2 can be determined. The first device transmits HARQ-ACK1 and HARQ-ACK2 in the PSFCH2 slot, but does not have time to transmit to the base station on PUCCH1. The first device receives HARQ-ACK3 on PSFCH3 and then transmits HARQ-ACK1 to HARQ-ACK3 to the base station on PUCCH2. As can be seen from FIG. 9, the first device only needs to ensure that it can transmit HARQ-ACK1 to HARQ-ACK3 to the base station on PUCCH2. The first device can autonomously determine how to receive HARQ-ACK1 to HARQ-ACK3 via the sidelink, and does not need to use the scheduling performed by the base station for HARQ-ACK in DCI.

[0134] The complete transmit and receive procedure for FIG. 9 can be summarized as follows:

[0135] The base station instructs the first device to transmit on PSSCH1 in DCI1, and instructs the first device to feed back HARQ-ACK1 associated with PSSCH1 on PUCCH1.

[0136] The first device transmits TB1 on PSSCH1. The second device does not transmit HARQ-ACK1 on PSFCH1 associated with PSSCH1 (e.g., due to an LBT failure), so the first device does not receive HARQ-ACK1 on PSFCH1.

[0137] The first device does not transmit PUCCH1 to the base station. Since PUCCH1 has not been received, the base station knows that it may schedule the first device to retransmit HARQ-ACK1 at a later opportunity.

[0138] The base station instructs the first device to transmit on PSSCH2 in DCI2, and instructs the first device to temporarily not feed back HARQ-ACK2.

[0139] The first device transmits TB2 on PSSCH2, and instructs the second device in SCI2 to transmit HARQ-ACK1 and HARQ-ACK2 in the PSFCH2 slot, i.e., schedules a retransmission for HARQ-ACK1, where PSFCH2 may include multiple PSFCH resources, and all of these PSFCH resources are associated with PSSCH2, i.e., one PSSCH is associated with multiple PSFCH resources.

[0140] -The second device is (P ID +M ID Q+q)mod(R PRB,CS PSFCH ), determine a number of PSFCH resources for transmitting HARQ-ACK1 and HARQ-ACK2, where Q is determined based on the C-SAI / T-SAI fields in SCI2, and is equal to the number of HARQ-ACK bits that the second device needs to transmit simultaneously, and is also equal to the size of the HARQ-ACK codebook. The second device transmits HARQ-ACK1 and HARQ-ACK2 in PSFCH2 slots.

[0141] The first device receives HARQ-ACK1 and HARQ-ACK2 in PSFCH2 slots.

[0142] - In DCI3, the base station instructs the first device to transmit on PSSCH3, and instructs the first device to feed back HARQ-ACK1 to HARQ-ACK3 on PUCCH2, i.e., schedules retransmission for HARQ-ACK1 and HARQ-ACK2.

[0143] The first device transmits TB3 on PSSCH3 and instructs the second device in SCI3 to transmit HARQ-ACK3 in the PSFCH3 slot.

[0144] -The second device is (P ID +M ID Q+q)mod(R PRB,CS PSFCH) to determine the PSFCH resource for transmitting HARQ-ACK3 based on the C-SAI / T-SAI field in SCI3, where Q=1.

[0145] The first device receives HARQ-ACK3 in PSFCH3 slot.

[0146] The first device transmits HARQ-ACK1 to HARQ-ACK3 to the base station on PUCCH2.

[0147] In some embodiments, a first device receives information from a second device transmitting to indicate the number of PSFCHs the second device may simultaneously transmit.

[0148] For example, the second device notifies the first device of the number N of PSFCHs that it can simultaneously transmit, and the first device can thereby determine the number Q of PSFCHs that the second device will simultaneously transmit. For example, the first device ensures that Q≦N during scheduling. There is no limitation on how the second device determines the value of N. N≦N max Among them, N max represents the maximum number of PSFCHs that the second device can simultaneously transmit, and N max depends on the device capability. The second device determines the number Q of PSFCHs that the second device will simultaneously transmit, and also determines the size of the HARQ-ACK codebook that the second device will transmit.

[0149] In some embodiments, the sidelink feedback information is determined to be dropped as a whole, and the highest priority of the sidelink feedback information is used for priority comparison.

[0150] For example, the second device may need to transmit a HARQ-ACK codebook to the first device and also need to simultaneously transmit HARQ-ACK to the third device. This reduces the number of PSFCHs that the second device simultaneously transmits to N maxmay exceed the number of PSFCHs. In this case, the second device needs to drop some PSFCHs, i.e., transmit only a portion of the PSFCHs. According to the existing priority rule, only a few PSFCHs with the highest priority are selected for transmission. When a HARQ-ACK codebook is present, transmitting only a portion of the HARQ-ACK in the HARQ-ACK codebook may destroy the integrity of the HARQ-ACK codebook, resulting in the first device failing to receive the HARQ-ACK codebook. Therefore, it should be determined whether the HARQ-ACK codebook is dropped as a whole. The priority of the HARQ-ACK codebook is equal to the highest priority of all HARQ-ACKs included in the HARQ-ACK codebook.

[0151] The above-described embodiments are provided to exemplify the present invention, but the present invention is not limited thereto, and appropriate modifications may be made based on the above-described embodiments. For example, each of the above-described embodiments may be used alone, or a plurality of the above-described embodiments may be used in combination.

[0152] As can be seen from the above embodiment, for HARQ-ACK retransmission from the second device to the first device, the size of the HARQ-ACK codebook is additionally used to determine the PSFCH resource, thereby avoiding the occurrence of PSFCH resource collision in groupcast HARQ-ACK retransmission.

[0153] <Example of the third aspect> In an embodiment of the present invention, there is provided a device for transmitting sidelink feedback information, which may be, for example, a terminal device (e.g., the first device described above) or one or more components or assemblies provided in the terminal device, and description of the same content as in the first and second aspects will be omitted here.

[0154] 10 is a diagram illustrating a sidelink feedback information transmitting apparatus 1000 according to an embodiment of the present invention. As shown in FIG. 10, the sidelink feedback information transmitting apparatus 1000 includes:

[0155] a determining unit 1001 for determining, when a physical uplink control channel needs to be transmitted to a network device, whether sidelink feedback information that needs to be carried by the physical uplink control channel has been received and whether a second device has already transmitted a physical sidelink control channel and / or a physical sidelink shared channel associated with the sidelink feedback information; and Processing unit 1002: not transmitting the physical uplink control channel if sidelink feedback information that needs to be carried by the physical uplink control channel has not been received and the second device has already transmitted a physical sidelink control channel and / or a physical sidelink shared channel associated with the sidelink feedback information.

[0156] In some embodiments, the processing unit 1002 does not transmit the physical uplink control channel if all sidelink feedback information that needs to be carried by the physical uplink control channel has not been received and the processing unit 1002 has already transmitted to the second device the physical sidelink control channel and / or the physical sidelink shared channel associated with all the sidelink feedback information.

[0157] In some embodiments, the processing unit 1002 does not transmit the physical uplink control channel if the number or proportion of unreceived sidelink feedback information among the plurality of sidelink feedback information to be carried by the physical uplink control channel is greater than a configured or pre-configured threshold and the second device has already transmitted a physical sidelink control channel and / or a physical sidelink shared channel associated with the plurality of sidelink feedback information.

[0158] In some embodiments, as shown in FIG. 10, the apparatus further includes:

[0159] A transmitting unit 1003: transmits the physical sidelink control channel and / or the physical sidelink shared channel to the second device.

[0160] In some embodiments, as shown in FIG. 10, the apparatus further includes:

[0161] A receiving unit 1004 receives information for instructing the network device to retransmit the sidelink feedback information when the network device does not receive the physical uplink control channel.

[0162] In some embodiments, the first device is enabled to resend sidelink feedback information to the network device and the second device is enabled to resend sidelink feedback information to the first device.

[0163] In some embodiments, the transmitting unit 1003 further transmits to the network device capability information whether the first device can support retransmission of sidelink feedback information and / or capability information whether the second device can support retransmission of sidelink feedback information.

[0164] In some embodiments, the receiving unit 1004 further receives indication information for enabling retransmission of the sidelink feedback information of the first device from the network device transmission.

[0165] In some embodiments, the receiving unit 1004 further receives capability information from the second device transmitting whether the second device can support retransmission of sidelink feedback information.

[0166] In some embodiments, the sending unit 1003 further sends, to the second device, indication information for enabling retransmission of the sidelink feedback information of the second device.

[0167] In some embodiments, the receiving unit 1004 is further configured to receive a plurality of sidelink feedback information transmitted by the second device, wherein physical sidelink feedback channel resources carrying the plurality of sidelink feedback information are determined by at least the number of the plurality of sidelink feedback information.

[0168] In some embodiments, the number of the plurality of sidelink feedback information is determined based on an allocation index field in the sidelink control information sent by the first device to the second device.

[0169] In some embodiments, the plurality of sidelink feedback information comprises feedback information for currently scheduled physical sidelink control channels and / or physical sidelink shared channels and / or feedback information for previously scheduled physical sidelink control channels and / or physical sidelink shared channels.

[0170] In some embodiments, the transport blocks carried by the currently scheduled physical sidelink control channel and / or physical sidelink shared channel are different from the transport blocks carried by the previously scheduled physical sidelink control channel and / or physical sidelink shared channel.

[0171] In some embodiments, the physical sidelink feedback channel resource is determined based on the following formula:

[0172] (P ID +M ID Q+q)mod(R PRB,CS PSFCH ) Among them, P ID represents the physical layer source ID, and M IDQ denotes the number of sidelink feedback information pieces, where q=0, 1, ..., Q-1.

[0173] In some embodiments, the information instructing grouping and / or retransmission of the sidelink feedback information in the sidelink control information sent by the first device to the second device is independent from the information instructing grouping and / or retransmission of the sidelink feedback information in downlink control information sent from the network device to the first device.

[0174] In some embodiments, the receiving unit 1004 further receives information from the second device transmitting to indicate the number of physical sidelink feedback channels that the second device may simultaneously transmit.

[0175] In some embodiments, the plurality of sidelink feedback information are determined to be dropped as a whole, and the highest priority of the plurality of sidelink feedback information is used for priority comparison.

[0176] The above-described embodiments are provided to exemplify the present invention, but the present invention is not limited thereto, and appropriate modifications may be made based on the above-described embodiments. For example, each of the above-described embodiments may be used alone, or a plurality of the above-described embodiments may be used in combination.

[0177] Although only the components or modules relevant to the present invention have been described above, the present invention is not limited thereto. The sidelink feedback information transmitting device 1000 may further include other components or modules, and the specific contents of these components or modules can be found in the related art.

[0178] 10 shows only the connection relationships or signal directions between each component or module, but as will be understood by those skilled in the art, various related technologies such as bus connection may be adopted. Each of these components or modules may be realized by hardware such as a processor, memory, transmitter, receiver, etc., and the present invention is not limited to these.

[0179] As can be seen from the above embodiment, for a HARQ-ACK retransmission from a first device to a network device, if the first device has already transmitted a PSCCH and / or PSSCH associated with the HARQ-ACK to a second device but has not received sidelink feedback information that needs to be carried by a PUCCH (i.e., the PUCCH does not contain a valid HARQ-ACK bit), the first device will not transmit the PUCCH to the network device, thereby reducing or avoiding unnecessary occupation of unlicensed frequency bands and notifying the network device of the scheduling of the HARQ-ACK retransmission. Also, for a HARQ-ACK retransmission from a second device to a first device, the size of the HARQ-ACK codebook is additionally used to determine the PSFCH resource, thereby avoiding PSFCH resource collisions during groupcast HARQ-ACK retransmissions.

[0180] <Example of the fourth aspect> In an embodiment of the present invention, there is provided a device for transmitting sidelink feedback information, which may be, for example, a terminal device (e.g., the above-mentioned second device) or one or more components or assemblies provided in the terminal device, and description of the same content as in the first and second aspects will be omitted here.

[0181] 11 is a diagram illustrating a sidelink feedback information transmitting apparatus 1100 according to an embodiment of the present invention. As shown in FIG. 11, the sidelink feedback information transmitting apparatus 1100 includes:

[0182] A receiving unit 1101: receives a physical sidelink control channel and / or a physical sidelink shared channel transmitted by a first device; and a sending unit 1102: sending a plurality of sidelink feedback information to the first device, in which physical sidelink feedback channel resources of the plurality of sidelink feedback information are determined at least by the number of the plurality of sidelink feedback information;

[0183] In some embodiments, the sending unit 1102 determines the number of the plurality of sidelink feedback information based on an allocation index field in the sidelink control information sent by the first device to the second device.

[0184] In some embodiments, the plurality of sidelink feedback information comprises feedback information for a currently scheduled physical sidelink control channel (PSCCH) and / or physical sidelink shared channel (PSSCH) and / or feedback information for a previously scheduled physical sidelink control channel (PSCCH) and / or physical sidelink shared channel (PSSCH).

[0185] In some embodiments, the transport blocks (TBs) carried by the currently scheduled physical sidelink control channel (PSCCH) and / or physical sidelink shared channel (PSSCH) are different from the transport blocks (TBs) carried by the previously scheduled physical sidelink control channel (PSCCH) and / or physical sidelink shared channel (PSSCH).

[0186] In some embodiments, the physical sidelink feedback channel (PSFCH) resource is determined by the following formula:

[0187] (P ID +M ID Q+q)mod(R PRB,CS PSFCH ) Among them, P ID indicates the physical layer source ID, and M ID denotes the group member ID configured by the upper layer, and Q denotes the number of the plurality of sidelink feedback information, where q=0, 1, ..., Q-1.

[0188] In some embodiments, the transmitting unit 1102 determines, based on an instruction from the first device, not to feed back sidelink feedback information, or determines not to feed back the sidelink feedback information if a physical sidelink feedback channel (PSFCH) carrying the sidelink feedback information is outside a channel occupancy time.

[0189] In some embodiments, the information instructing grouping and / or retransmission of sidelink feedback information in sidelink control information (SCI) sent by the first device to the second device is independent of the information instructing grouping and / or retransmission of sidelink feedback information in downlink control information (DCI) sent from a network device to the first device.

[0190] In some embodiments, the transmitting unit 1102 transmits information to the first device to indicate the number of PSFCHs that the second device can simultaneously transmit.

[0191] In some embodiments, the transmitting unit 1102 determines whether to drop the plurality of sidelink feedback information as a whole, wherein the highest priority of the plurality of sidelink feedback information is used for priority comparison.

[0192] The above-described embodiments are provided to exemplify the present invention, but the present invention is not limited to these, and appropriate modifications may be made based on the above-described embodiments. For example, each of the above-described embodiments may be used alone, or a combination of two or more of the above-described embodiments may be used.

[0193] Although only the components or modules relevant to the present invention have been described above, the present invention is not limited thereto. The sidelink feedback information transmitting device 1100 may further include other components or modules, and the specific contents of these components or modules can be found in the related art.

[0194] 11 shows only the connection relationships or signal directions between each component or module, but as will be understood by those skilled in the art, various related technologies such as bus connection may be adopted. Each of the above-described components or modules may be realized by hardware such as a processor, memory, transmitter, receiver, etc., but the implementation of the present invention is not limited to these.

[0195] As can be seen from the above embodiment, for a HARQ-ACK retransmission from a first device to a network device, if the first device has already transmitted a PSCCH and / or PSSCH associated with the HARQ-ACK to a second device but has not received sidelink feedback information that needs to be carried by a PUCCH (i.e., the PUCCH does not contain a valid HARQ-ACK bit), the first device will not transmit the PUCCH to the network device, thereby reducing or avoiding unnecessary occupation of unlicensed frequency bands and notifying the network device of the scheduling of the HARQ-ACK retransmission. Also, for a HARQ-ACK retransmission from a second device to a first device, the size of the HARQ-ACK codebook is additionally used to determine the PSFCH resource, thereby avoiding PSFCH resource collisions during groupcast HARQ-ACK retransmissions.

[0196] <Example of the fifth aspect> An embodiment of the present invention further provides a communication system, which can be seen from FIG. 1, and the description of the same contents as those of the first to fourth aspects will be omitted here.

[0197] In some embodiments, the communication system 100 may include at least the following:

[0198] the first device, when it needs to transmit a physical uplink control channel to a network device, determines whether sidelink feedback information to be carried by the physical uplink control channel has been received and whether it has already transmitted a physical sidelink control channel and / or a physical sidelink shared channel associated with the sidelink feedback information to a second device; and does not transmit the physical uplink control channel if it has not received sidelink feedback information to be carried by the physical uplink control channel and whether it has already transmitted a physical sidelink control channel and / or a physical sidelink shared channel associated with the sidelink feedback information to the second device; and / or a second device receiving the physical sidelink control channel and / or physical sidelink shared channel transmitted by the first device and transmitting a plurality of sidelink feedback information to the first device, in which the physical sidelink feedback channel resources of the plurality of sidelink feedback information are determined at least by the number of the plurality of sidelink feedback information.

[0199] In the embodiment of the present invention, a network device is further provided, which may be, for example, a base station, but the present invention is not limited thereto and may also be other network devices.

[0200] 12 is a block diagram of a network device according to an embodiment of the present invention. As shown in FIG. 12, the network device 1200 may include a processor 1210 (e.g., a central processing unit (CPU)) and a memory 1220, which is connected to the processor 1210. The memory 1220 can store various data and can further store a program 1230 for information processing, and can execute the program 1230 under the control of the processor 1210.

[0201] For example, the processor 1210 may be configured to execute a program to implement the method for receiving sidelink feedback information described in the embodiments of the first aspect. For example, the processor 1210 may be configured to perform the following control: receive sidelink feedback information carried by a first device via a physical uplink control channel (PUCCH), in which the physical uplink control channel (PUCCH) is transmitted when the first device determines that sidelink feedback information that needs to be carried by the physical uplink control channel has already been received.

[0202] 12, the network device 1200 may further include a transceiver 1240, an antenna 1250, etc., the functions of which are the same as those of the prior art, and detailed descriptions thereof will be omitted here. Note that the network device 1200 does not need to include all the components shown in FIG. 12, and the network device 1200 may include components not shown in FIG. 12, for which reference can be made to the prior art.

[0203] Although a terminal device is further provided in the embodiment of the present invention, the present invention is not limited thereto and may be other devices.

[0204] 13 is a diagram illustrating a terminal device according to an embodiment of the present invention. As shown in FIG. 13, the terminal device 1300 may include a processor 1310 and a memory 1320, where the memory 1320 stores data and programs and is connected to the processor 1310. Note that this diagram is merely an example, and other types of structures may be used to supplement or replace the structures to achieve telecommunication or other functions.

[0205] For example, the processor 1310 may be configured to execute a program to implement the method for transmitting sidelink feedback information described in the embodiments of the first aspect. For example, the processor 1310 may be configured to perform the following control: when a physical uplink control channel (PUCCH) needs to be transmitted to a network device, determine whether sidelink feedback information to be carried by the physical uplink control channel (PUCCH) has been received and whether a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH) associated with the sidelink feedback information has already been transmitted to a second device; and when a physical uplink control channel (PUCCH) needs to be received and whether a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH) associated with the sidelink feedback information has already been transmitted to a second device, not transmit the physical uplink control channel (PUCCH).

[0206] For example, the processor 1310 may be configured to execute a program to implement the method for transmitting sidelink feedback information described in the embodiments of the second aspect. For example, the processor 1310 may be configured to perform the following control: receive a Physical Sidelink Control Channel (PSCCH) and / or a Physical Sidelink Shared Channel (PSSCH) transmitted by a first device; and transmit a plurality of sidelink feedback information to the first device, in which Physical Sidelink Feedback Channel (PSFCH) resources for the plurality of sidelink feedback information are determined by at least the number of the plurality of sidelink feedback information.

[0207] As shown in Fig. 13, the terminal device 1300 may further include a communication module 1330, an input unit 1340, a display 1350, a power supply 1360, etc. The functions of these components are the same as those of the prior art, and detailed descriptions thereof will be omitted here. Note that the terminal device 1300 does not need to include all of the components shown in Fig. 13, and these components are not essential. Furthermore, the terminal device 1300 may further include components not shown in Fig. 13, and reference can be made to the prior art for such components.

[0208] In an embodiment of the present invention, a computer program is further provided, which, when executed in a terminal device, causes the terminal device to perform the method for transmitting sidelink feedback information described in the embodiments of the first and second aspects.

[0209] In some embodiments of the present invention, a storage medium storing a computer program is further provided, wherein the computer program causes a terminal device to perform the method for transmitting sidelink feedback information described in the embodiments of the first and second aspects.

[0210] In another embodiment of the present invention, a computer program is provided, which, when executed in a network device, causes the network device to perform the method for receiving sidelink feedback information described in the embodiment of the first aspect.

[0211] In some embodiments of the present invention, a storage medium is further provided that stores a computer program, wherein the computer program causes a network device to perform the method for receiving sidelink feedback information described in the embodiments of the first aspect.

[0212] The above-described devices and methods may be realized by software or hardware, or by a combination of hardware and software. The present invention also relates to a computer-readable program as described below, which, when executed by a logic component, causes the logic component to realize the above-described devices or components, or to perform the above-described methods or steps. The logic component may be, for example, an FPGA (Field Programmable Gate Array), a microprocessor, or a processing unit used in a computer. The present invention also relates to a storage medium, such as a hard disk, magnetic disk, optical hard disk, DVD, or flash memory, that stores the above-described program.

[0213] Furthermore, one or more combinations of the functional blocks illustrated in the figures and / or one or more combinations of the functional blocks may be implemented as a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic component, a discrete gate or transistor logic component, a discrete hardware assembly, or any other suitable combination for performing the functions described herein. Also, one or more combinations of the functional blocks illustrated in the figures and / or one or more combinations of the functional blocks may be further implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors communicatively coupled with a DSP, or any other configuration.

[0214] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and any modifications to the present invention that do not depart from the spirit of the present invention fall within the technical scope of the present invention.

[0215] Furthermore, the following additional notes are disclosed regarding the above-described embodiments.

[0216] (Appendix 1) 1. A method for transmitting sidelink feedback information, comprising: When the first device needs to transmit a physical uplink control channel (PUCCH) to a network device, determining whether sidelink feedback information that needs to be carried by the physical uplink control channel has been received and whether the first device has already transmitted a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH) associated with the sidelink feedback information to a second device; and the first device not transmitting the Physical Uplink Control Channel (PUCCH) if sidelink feedback information that needs to be carried by the Physical Uplink Control Channel (PUCCH) has not been received and the first device has already transmitted a Physical Sidelink Control Channel (PSCCH) and / or a Physical Sidelink Shared Channel (PSSCH) associated with the sidelink feedback information to a second device.

[0217] (Appendix 2) 2. The method of claim 1, comprising: 1. The method of claim 1, wherein the first device does not transmit the Physical Uplink Control Channel (PUCCH) if all sidelink feedback information that needs to be carried by the Physical Uplink Control Channel (PUCCH) has not been received and the first device has already transmitted to the second device a Physical Sidelink Control Channel (PSCCH) and / or a Physical Sidelink Shared Channel (PSSCH) associated with all the sidelink feedback information.

[0218] (Appendix 3) 2. The method of claim 1, comprising: 1. The method of claim 1, wherein the first device does not transmit the Physical Uplink Control Channel (PUCCH) if the number or percentage of unreceived sidelink feedback information among a plurality of sidelink feedback information to be carried by the Physical Uplink Control Channel (PUCCH) is greater than a configured or pre-configured threshold and the first device has already transmitted to a second device a Physical Sidelink Control Channel (PSCCH) and / or a Physical Sidelink Shared Channel (PSSCH) associated with the plurality of sidelink feedback information.

[0219] (Appendix 4) 4. The method of any one of claims 1 to 3, comprising: The method further comprises: receiving, by the first device, information for instructing the network device to retransmit the sidelink feedback information when the network device does not receive the physical uplink control channel.

[0220] (Appendix 5) 5. The method of any one of claims 1 to 4, comprising: 10. The method of claim 9, wherein the first device is enabled to retransmit sidelink feedback information to the network device and the second device is enabled to retransmit sidelink feedback information to the first device.

[0221] (Appendix 6) 6. The method of any one of claims 1 to 5, comprising: The method further comprises: the first device transmitting, to the network device, capability information indicating whether the first device can support retransmission of sidelink feedback information and / or capability information indicating whether the second device can support retransmission of sidelink feedback information.

[0222] (Appendix 7) 7. The method of any one of claims 1 to 6, comprising: The method further comprises: 10. The method of claim 9, further comprising: receiving, by the first device, indication information from the network device transmitted by the first device for enabling the first device to perform retransmission of sidelink feedback information.

[0223] (Appendix 8) 8. The method of any one of claims 1 to 7, comprising: The method further comprises: 10. The method of claim 9, further comprising: receiving, by the first device, capability information from the second device transmitting whether the second device can support retransmission of sidelink feedback information.

[0224] (Appendix 9) 9. The method of any one of claims 1 to 8, comprising: The method further comprises: 20. The method of claim 19, further comprising: transmitting, from the first device to the second device, indication information for enabling the second device to retransmit sidelink feedback information.

[0225] (Appendix 10) 10. The method of any one of claims 1 to 9, comprising: The method further comprises: transmitting non-acknowledgement (NACK) information to the network device when the first device is unable to transmit the physical sidelink control channel (PSCCH) and / or the physical sidelink shared channel (PSSCH) to the second device due to an LBT failure.

[0226] (Appendix 11) 11. The method of any one of claims 1 to 10, comprising: The method further comprises: receiving, by the first device, a plurality of sidelink feedback information transmitted by the second device; a physical sidelink feedback channel (PSFCH) resource carrying the plurality of sidelink feedback information is determined by at least the number of the plurality of sidelink feedback information.

[0227] (Appendix 12) 12. The method of claim 11, the number of the plurality of sidelink feedback information is determined based on an Assignment Index (AI) field in sidelink control information sent by the first device to the second device.

[0228] (Appendix 13) 13. The method according to claim 11 or 12, the plurality of sidelink feedback information comprises feedback information for a currently scheduled Physical Sidelink Control Channel (PSCCH) and / or Physical Sidelink Shared Channel (PSSCH) and / or feedback information for a previously scheduled Physical Sidelink Control Channel (PSCCH) and / or Physical Sidelink Shared Channel (PSSCH).

[0229] (Appendix 14) 14. The method of claim 13, 1. A method according to claim 1, wherein the transport blocks (TBs) carried by the currently scheduled physical sidelink control channel (PSCCH) and / or physical sidelink shared channel (PSSCH) are different from the transport blocks (TBs) carried by the previously scheduled physical sidelink control channel (PSCCH) and / or physical sidelink shared channel (PSSCH).

[0230] (Appendix 15) 15. The method of any one of claims 11 to 14, comprising: The physical sidelink feedback channel (PSFCH) resource is determined by the following formula: (P ID +M ID Q+q)mod(R PRB,CS PSFCH ) Among them, P IDrepresents the physical layer source ID, and M ID Q is the number of sidelink feedback information pieces, where q=0, 1, ..., Q-1.

[0231] (Appendix 16) 16. The method of any one of claims 11 to 15, comprising: 10. The method of claim 9, wherein information instructing grouping and / or retransmission of the sidelink feedback information in sidelink control information (SCI) transmitted by the first device to the second device is independent of information instructing grouping and / or retransmission of the sidelink feedback information in downlink control information (DCI) transmitted by the network device to the first device.

[0232] (Appendix 17) 17. The method of any one of claims 11 to 16, comprising: The method further comprises: The method includes receiving, by the first device, information from the second device transmitting to indicate a number of PSFCHs that the second device may simultaneously transmit.

[0233] (Appendix 18) 18. The method of any one of claims 11 to 17, comprising: wherein the plurality of sidelink feedback information are determined to be dropped as a whole, and the highest priority of the plurality of sidelink feedback information is used for priority comparison.

[0234] (Appendix 19) 19. The method of any one of claims 1 to 18, comprising: The method further comprises: the first device transmitting the physical sidelink control channel (PSCCH) and / or the physical sidelink shared channel (PSSCH) to the second device.

[0235] (Appendix 20) 1. A method for transmitting sidelink feedback information, comprising: The second device receives a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH) transmitted by the first device; and the second device transmitting a plurality of sidelink feedback information to the first device; a physical sidelink feedback channel (PSFCH) resource for the plurality of sidelink feedback information is determined by at least the number of the plurality of sidelink feedback information.

[0236] (Appendix 21) 21. The method of claim 20, The method further comprises: determining, by the second device, a number of the plurality of sidelink feedback information based on an assignment index field in sidelink control information transmitted by the first device to the second device.

[0237] (Appendix 22) 22. The method according to claim 20 or 21, the plurality of sidelink feedback information comprises feedback information for a currently scheduled Physical Sidelink Control Channel (PSCCH) and / or Physical Sidelink Shared Channel (PSSCH) and / or feedback information for a previously scheduled Physical Sidelink Control Channel (PSCCH) and / or Physical Sidelink Shared Channel (PSSCH).

[0238] (Appendix 23) 23. The method of claim 22, 1. A method according to claim 1, wherein the transport blocks (TBs) carried by the currently scheduled physical sidelink control channel (PSCCH) and / or physical sidelink shared channel (PSSCH) are different from the transport blocks (TBs) carried by the previously scheduled physical sidelink control channel (PSCCH) and / or physical sidelink shared channel (PSSCH).

[0239] (Appendix 24) 24. The method of any one of claims 20 to 23, comprising: The physical sidelink feedback channel (PSFCH) resource is determined by the following formula: (P ID +M ID Q+q)mod(R PRB,CS PSFCH ) Among them, P ID represents the physical layer source ID, and M ID Q is the number of sidelink feedback information pieces, where q=0, 1, ..., Q-1.

[0240] (Appendix 25) 25. The method of any one of claims 20 to 24, comprising: The method further comprises: determining, by the second device, not to feed back sidelink feedback information based on an instruction from the first device or determining, if a Physical Sidelink Feedback Channel (PSFCH) carrying the sidelink feedback information is outside a channel occupancy time, not to feed back the sidelink feedback information.

[0241] (Appendix 26) 26. The method of any one of claims 20 to 25, comprising: 10. The method of claim 1, wherein information instructing grouping and / or retransmission of sidelink feedback information in sidelink control information (SCI) transmitted by the first device to the second device is independent of information instructing grouping and / or retransmission of sidelink feedback information in downlink control information (DCI) transmitted by a network device to the first device.

[0242] (Appendix 27) 27. The method of any one of claims 20 to 26, comprising: The method further comprises: The method includes the second device transmitting information to the first device to indicate a number of PSFCHs that the second device can simultaneously transmit.

[0243] (Appendix 28) 28. The method of any one of claims 20 to 27, comprising: The method further comprises: determining whether the second device should drop the plurality of sidelink feedback information as a whole; wherein the highest priority of the plurality of sidelink feedback information is used for priority comparison.

[0244] (Appendix 29) 1. A method for transmitting sidelink feedback information, comprising: When the first device needs to transmit a physical uplink control channel (PUCCH) to a network device, determining whether sidelink feedback information that needs to be carried by the physical uplink control channel is valid or a padding bit; and 11. The method of claim 10, further comprising: the first device not transmitting the physical uplink control channel (PUCCH) if sidelink feedback information that needs to be carried by the physical uplink control channel is invalid or a padding bit.

[0245] (Appendix 30) 29. The method of claim 29, determining, by the first device, that the sidelink feedback information is invalid or padding bits if the first device has not received the sidelink feedback information and has already transmitted to the second device a Physical Sidelink Control Channel (PSCCH) and / or a Physical Sidelink Shared Channel (PSSCH) associated with the sidelink feedback information.

[0246] (Appendix 31) 29. The method of claim 29, The method of claim 1, wherein the first device does not transmit the physical uplink control channel (PUCCH) if all sidelink feedback information that needs to be carried by the physical uplink control channel is invalid or is padding bits.

[0247] (Appendix 32) 29. The method of claim 29, 1. The method of claim 1, wherein the first device does not transmit the physical uplink control channel (PUCCH) if a number or a percentage of invalid sidelink feedback information or padding bits among a plurality of sidelink feedback information pieces that need to be carried by the physical uplink control channel (PUCCH) is greater than a configured or pre-configured threshold.

[0248] (Appendix 33) In the method of receiving sidelink feedback information, receiving, by the network device, sidelink feedback information carried by the first device via a physical uplink control channel; The physical uplink control channel (PUCCH) is transmitted when the first device determines that sidelink feedback information that needs to be carried by the physical uplink control channel has already been received.

[0249] (Appendix 34) 34. The method of claim 33, 1. The method of claim 1, wherein the first device does not transmit a Physical Uplink Control Channel (PUCCH) if sidelink feedback information that needs to be carried by the Physical Uplink Control Channel (PUCCH) has not been received by the first device and the first device has already transmitted a Physical Sidelink Control Channel (PSCCH) and / or a Physical Sidelink Shared Channel (PSSCH) associated with the sidelink feedback information to a second device.

[0250] (Appendix 35) 35. The method of claim 34, 2. The method of claim 1, wherein the first device does not transmit the Physical Uplink Control Channel (PUCCH) if all sidelink feedback information that needs to be carried by the Physical Uplink Control Channel (PUCCH) has not been received by the first device and the first device has already transmitted to a second device a Physical Sidelink Control Channel (PSCCH) and / or a Physical Sidelink Shared Channel (PSSCH) associated with all the sidelink feedback information.

[0251] (Appendix 36) 35. The method of claim 34, 2. The method of claim 1, wherein a physical uplink control channel (PUCCH) is not transmitted by the first device if the number or percentage of sidelink feedback information that has not been received by the first device among a plurality of sidelink feedback information items that need to be carried by the physical uplink control channel (PUCCH) is greater than a set or pre-set threshold and the first device has already transmitted a physical sidelink control channel (PSCCH) and / or a physical sidelink shared channel (PSSCH) associated with the plurality of sidelink feedback information items to a second device.

[0252] (Appendix 37) 37. The method of any one of claims 33 to 36, comprising: The method further comprises: transmitting, to the first device, information for instructing the first device to perform a retransmission of the sidelink feedback information when the network device does not receive the physical uplink control channel.

[0253] (Appendix 38) 38. The method of any one of claims 33 to 37, comprising: 10. The method of claim 9, wherein the first device is enabled to retransmit sidelink feedback information to the network device and the second device is enabled to retransmit sidelink feedback information to the first device.

[0254] (Appendix 39) 39. The method of any one of claims 33 to 38, comprising: The method further comprises: receiving, by the network device, capability information of the first device transmitting whether the first device can support retransmission of sidelink feedback information and / or capability information of the second device transmitting whether the second device can support retransmission of sidelink feedback information.

[0255] (Appendix 40) 40. The method of any one of claims 33 to 39, comprising: The method further comprises: 20. The method of claim 19, further comprising: transmitting, from the network device to the first device, instruction information for enabling the first device to retransmit sidelink feedback information.

[0256] (Appendix 41) A terminal device including a storage unit and a processor, The storage device stores a computer program, 33. A terminal device, wherein the processor is configured to execute the computer program to implement the method for transmitting sidelink feedback information according to any one of Supplementary Notes 1 to 32.

[0257] (Appendix 42) A network device including a storage device and a processor, The storage device stores a computer program, 41. A network device, wherein the processor is configured to execute the computer program to implement the method for receiving sidelink feedback information as defined in any one of Supplementary Notes 33 to 40.

Claims

1. A first terminal device, a processor configured to perform LBT; and A first terminal device including a transmitter configured to transmit a NACK to a network device when a PSSCH is not transmitted to a second terminal device on resources scheduled by downlink control information or resources of a configured grant due to an LBT failure.

2. A first terminal device according to claim 1, The processor further performs LBT to transmit the PSSCH to the second terminal device, a first terminal device.

3. A first terminal device according to claim 1, and a receiver configured to receive a plurality of sidelink feedback information transmitted by the second terminal device. A first terminal device, wherein a PSFCH resource for carrying the plurality of sidelink feedback information is determined by at least the number of the plurality of sidelink feedback information.

4. A first terminal device according to claim 3, A first terminal device, wherein the number of the plurality of sidelink feedback information is determined based on an allocation index field in sidelink control information transmitted by the first terminal device to the second terminal device.

5. A first terminal device according to claim 3, A first terminal device, wherein the plurality of sidelink feedback information includes feedback information about a currently scheduled PSCCH and / or PSSCH and / or feedback information about a previously scheduled PSCCH and / or PSSCH.

6. A first terminal device according to claim 5, A first terminal device, in which the transport blocks carried by the currently scheduled PSCCH and / or PSSCH are different from the transport blocks carried by the previously scheduled PSCCH and / or PSSCH.

7. A first terminal device according to claim 3, The PSFCH resource is (P ID +M ID ・Q+q) mod (R PRB, CS PSFCH) It is determined by Here, P ID represents a physical layer source ID, M ID represents a group member ID set by an upper layer, and Q represents the number of the multiple sidelink feedback information, where q = 0, 1, ..., Q-1, a first terminal device.

8. A first terminal device according to claim 3, A first terminal device, wherein information instructing grouping and / or retransmission of the sidelink feedback information in the sidelink control information transmitted by the first terminal device to the second terminal device is independent of information instructing grouping and / or retransmission of the sidelink feedback information in downlink control information transmitted by the network device to the first terminal device.

9. A first terminal device according to claim 3, A first terminal device, wherein the receiver receives information transmitted by the second terminal device for indicating the number of PSFCHs that the second terminal device can transmit simultaneously.

10. A first terminal device according to claim 3, The first terminal device determines whether the plurality of sidelink feedback information is to be dropped as a whole, and the highest priority of the plurality of sidelink feedback information is used for priority comparison.

11. A first terminal device according to claim 1, A first terminal device, wherein the transmitter transmits the PSSCH and / or PSCCH to the second terminal device.

12. A method for transmitting sidelink feedback information, comprising: The first terminal device performs LBT; and A method including the step of sending a NACK to a network device when the first terminal device does not transmit a PSSCH to a second terminal device on a resource scheduled by downlink control information or a resource of a configured grant due to an LBT failure.

13. The method of claim 12, comprising: The first terminal device further includes receiving a plurality of sidelink feedback information transmitted by the second terminal device; a PSFCH resource carrying the plurality of sidelink feedback information signals is determined by at least the number of the plurality of sidelink feedback information signals.

14. The method of claim 13, The method of claim 1, wherein the number of the plurality of sidelink feedback information is determined based on an assignment index field in sidelink control information transmitted by the first terminal device to the second terminal device.

15. The method of claim 13, comprising:

10. The method of claim 9, wherein the plurality of sidelink feedback information comprises feedback information for a currently scheduled PSCCH and / or PSSCH and / or feedback information for a previously scheduled PSCCH and / or PSSCH.

16. The method of claim 15, A method in which the transport blocks carried by the currently scheduled PSCCH and / or PSSCH are different from the transport blocks carried by the previously scheduled PSCCH and / or PSSCH.

17. The method of claim 13, The PSFCH resource is (P ID +M ID ・Q+q) mod (R PRB, CS PSFCH) It is determined by wherein P ID represents a physical layer source ID, M ID represents a group member ID configured by a higher layer, and Q represents the number of the plurality of sidelink feedback information, where q=0, 1, ..., Q-1.

18. The method of claim 13, wherein information instructing grouping and / or retransmission of the sidelink feedback information in the sidelink control information transmitted by the first terminal device to the second terminal device is independent of information instructing grouping and / or retransmission of the sidelink feedback information in downlink control information transmitted by the network device to the first terminal device.

19. The method of claim 13, comprising: The first terminal device further includes receiving information transmitted by the second terminal device for indicating the number of PSFCHs that the second terminal device can simultaneously transmit; wherein the plurality of sidelink feedback information are determined to be dropped as a whole and the highest priority of the plurality of sidelink feedback information is used for priority comparison.

20. A communication system including a first terminal device, a second terminal device, and a network device, The first terminal device Perform LBT; and A communication system that sends a NACK to the network device when a PSSCH is not transmitted to the second terminal device using resources scheduled by downlink control information or resources of a configured grant due to an LBT failure.

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