CN-121986505-A - Device-to-device communication

Abstract

Systems, methods, and apparatuses for wireless communication are described. A method of wireless communication includes selecting, by a wireless device, a transmission resource to transmit data associated with a device-to-device communication, and performing, by the wireless device, the device-to-device communication in accordance with the transmission resource. The method also includes detecting, by the wireless device, a listen before talk (C-LBT) failure for a duration of the device-to-device communication. The method also includes determining, by the wireless device, that a bandwidth portion (BWP) associated with the device-to-device communication is deactivated and canceling, by the wireless device, the C-LBT failure.

Inventors

• DU WEIQIANG

Assignees

• 中兴通讯股份有限公司

Dates

Publication Date

20260505

Application Date

20230928

Claims (14)

1. 1. A method of wireless communication, comprising: selecting, by a wireless device, transmission resources to transmit data associated with a device-to-device communication, and The device-to-device communication is performed by the wireless device in accordance with the transmission resources.
2. 2. The method of claim 1, further comprising: Detecting, by the wireless device, a listen before talk (C-LBT) failure for a duration of the device-to-device communication; determining, by the wireless device, that a bandwidth portion (BWP) associated with the device-to-device communication is deactivated, and Cancelling, by the wireless device, the C-LBT failure.
3. 3. The method of any one of claims 1 or 2, further comprising receiving, by the wireless device, side chain control information (SCI) enabling hybrid automatic repeat request (HARQ) feedback, wherein the SCI indicates a negative acknowledgement only, and wherein the wireless device is within an licensed carrier or is not within an unlicensed carrier.
4. 4. The method of any of claims 1-3, further comprising indicating, by the wireless device, a physical layer to generate a negative acknowledgement for data in a Transport Block (TB) associated with the device-to-device communication, wherein the data in the TB was successfully decoded without an attempt by a Medium Access Control (MAC) entity, and wherein the data in the TB was not successfully decoded prior to the attempt.
5. 5. The method of claim 2, further comprising: Determining, by the wireless device, that a Media Access Control (MAC) Packet Data Unit (PDU) is available in a hybrid automatic repeat request (HARQ) buffer, and Selecting, by the wireless device, transmission resources for the MAC PDUs available in the HARQ buffer if at least one of: The transmission resources for the MAC PDU are indicated for preemption; The transmission resources for the MAC PDU are indicated for re-evaluation; The transmission resource for the MAC PDU is a collision resource indicated by the peer wireless device, or The transmission resource for the MAC PDU is a resource in which the C-LBT failure is detected.
6. 6. The method of any one of claims 1 or 2, further comprising flushing, by the wireless device, a hybrid automatic repeat request (HARQ) buffer if at least one of: if a positive acknowledgement is received for transmission of a Media Access Control (MAC) Packet Data Unit (PDU), and if transmission resources associated with the transmission of the MAC PDU are not within Multiple Contiguous Slot Transmission (MCST) resources; If a positive acknowledgement is received for transmission of a MAC PDU, and if a transmission resource associated with the transmission of the MAC PDU is a last resource within a MCST resource; if a positive acknowledgement is received for at least one transmission resource within the MCST resource; If a negative acknowledgement only is enabled in the side chain control information (SCI) and a negative acknowledgement for transmission of a MAC PDU is not received, and if a transmission resource associated with the transmission of the MAC PDU is not within MCST resources; If a negative acknowledgement only is enabled in the SCI and no negative acknowledgement is received for the transmission of the MAC PDU and if the transmission resource associated with the transmission of the MAC PDU is the last resource within the MCST resource, or If no negative acknowledgement is received for at least one transmission resource within the MCST.
7. 7. The method of any of claims 1-3, further comprising purging, by the wireless device, transmission resources for a Medium Access Control (MAC) Packet Data Unit (PDU) from the selected resources if the selected side chain grant is available for retransmission of the MAC PDU that has been positively acknowledged.
8. 8. The method of claim 7, further comprising clearing, by the wireless device, a physical side link control channel (PSCCH) duration and a physical side uplink shared channel (PSSCH) duration from the selected side link grant corresponding to retransmission of the MAC PDU.
9. 9. A method of wireless communication, comprising: receiving, by a network node, a request for transmission resources for device-to-device communication, and The transmission resources are sent by the network node in response to the request for transmission of data by the wireless device to the peer wireless device.
10. 10. The method of claim 9, further comprising transmitting, by the network node, side chain control information (SCI) enabling hybrid automatic repeat request (HARQ) feedback, wherein the SCI indicates a negative acknowledgement only, and wherein the wireless device is within an licensed carrier or is not within an unlicensed carrier.
11. 11. The method of any of claims 9 or 10, further comprising transmitting, by the network node, a negative acknowledgement for data in a Transport Block (TB) associated with device-to-device communication, wherein the data in the TB was not successfully decoded by an attempt by a Medium Access Control (MAC) entity, and wherein the data in the TB was not successfully decoded prior to the attempt.
12. 12. The method of claim 9, further comprising transmitting, by the network node, transmission resources for a Medium Access Control (MAC) Packet Data Unit (PDU) in a hybrid automatic repeat request (HARQ) buffer if at least one of: The transmission resources for the MAC PDU are indicated for preemption; The transmission resources for the MAC PDU are indicated for re-evaluation; The transmission resource for the MAC PDU is a collision resource indicated by the peer wireless device, or The transmission resource for the MAC PDU is a resource for which a continuous listen before talk (C-LBT) failure is detected by the wireless device.
13. 13. An apparatus for wireless communication, comprising a processor, wherein the processor is configured to implement the method of any one or more of claims 1-12.
14. 14. A computer readable program storage medium having code stored thereon, which when executed by a processor, causes the processor to implement the method of any one or more of claims 1 to 12.

Description

Device-to-device communication Technical Field This patent document relates generally to wireless communications. Background Mobile telecommunications technology is pushing the world to an increasingly connected and networked society. Next generation systems and wireless communication technologies will need to support a wider range of use case features and provide a more complex and sophisticated range of access requirements and flexibility than existing wireless networks. Long-Term Evolution (LTE) is a wireless communication standard developed by the third generation partnership project (3rd Generation Partnership Project,3GPP) for mobile devices and data terminals. LTE evolution (LTE ADVANCED, LTE-a) is a wireless communication standard that enhances the LTE standard. The fifth generation wireless system (referred to as 5G) has advanced the LTE and LTE-a wireless standards and is dedicated to support higher data rates, large numbers of connections, ultra low latency, high reliability, and other emerging traffic demands. Disclosure of Invention Techniques for performing device-to-device communications are disclosed. Techniques are based on selecting transmission resources from multiple contiguous slot transmission (multiple consecutive slot transmission, MCST) resources, enabling hybrid automatic repeat request (hybrid automatic repeat request, HARQ) feedback, and managing continuous listen-before-talk (C-LBT) failures. A first example wireless communication method includes selecting, by a wireless device, transmission resources to transmit data associated with a device-to-device communication. The method also includes performing, by the wireless device, device-to-device communication in accordance with the transmission resources. A second example wireless communication method includes receiving, by a network node, a request for transmission resources for a device-to-device communication. The method further includes transmitting, by the network node, transmission resources for the wireless device to transmit data to the peer wireless device in response to the request. In yet another exemplary embodiment, an apparatus configured or operable to perform the above method is disclosed. The apparatus may comprise a processor configured to implement the above-described method. In yet another exemplary embodiment, the above-described method is embodied in the form of processor-executable code and stored in a non-transitory computer-readable storage medium. The code embodied in the computer readable storage medium, when executed by a processor, causes the processor to implement the methods described in this patent document. The above and other aspects and embodiments thereof are described in more detail in the accompanying drawings, description and claims. Drawings Fig. 1 is a table of channel access priority class (CHANNEL ACCESS priority class, CAPC) values. Fig. 2 is a table of CAPC values for Uplink (UL). Fig. 3 is a table of time spans in which a User Equipment (UE) needs to process a reception channel. Fig. 4 is another table of time spans that User Equipment (UE) needs to process a receive channel. Fig. 5 is an example multiple contiguous time slot transmission (multiple consecutive slot transmission, MCST) resource. Fig. 6 is another example MCST resource. Fig. 7 is yet another example MCST resource. Fig. 8 is an exemplary user plane protocol stack. Fig. 9 is an exemplary control plane protocol stack. Fig. 10 is an exemplary side link synchronization signal block (sidelink synchronization signal block, S-SSB). FIG. 11 is an example flow chart for performing device-to-device communication. Fig. 12 is an example flow chart for sending transmission resources. Fig. 13 illustrates a block diagram of an example hardware platform that may be part of a network node or wireless device. Fig. 14 illustrates an example wireless communication including a Base Station (BS) and a User Equipment (UE) in accordance with some embodiments of the disclosed technology. Detailed Description The following example headings of various sections are used to facilitate an understanding of the disclosed subject matter and are not intended to limit the scope of the claimed subject matter in any way. Thus, one or more features of one example portion may be combined with one or more features of another example portion. Furthermore, the 5G terminology is used for clarity of illustration, but the techniques disclosed in this document are not limited to only 5G techniques, but may also be used in wireless systems implementing other protocols. I. Summary of the invention This patent document describes how a wireless device selects resources when performing wireless communications on an unlicensed carrier (e.g., shared spectrum). As wireless multimedia services continue to evolve, users' demands for high data rates and user experiences continue to increase, which places higher demands on the system capacity and coverage of conventional cellula