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US-12628035-B2 - Method and device for reporting buffer status report, and relay user equipment

US12628035B2US 12628035 B2US12628035 B2US 12628035B2US-12628035-B2

Abstract

A method for reporting a BSR is provided. The method includes: triggering the reporting of the BSR in the case that a triggering condition for reporting the BSR has been met; transmitting the BSR to a network device.

Inventors

  • Da Wang
  • Yali Zhao
  • Huiying Zhang

Assignees

  • DATANG MOBILE COMMUNICATIONS EQUIPMENT CO., LTD.

Dates

Publication Date
20260512
Application Date
20210709
Priority Date
20200709

Claims (20)

  1. 1 . A method for reporting a Buffer Status Report (BSR), comprising: triggering, by a relay User Equipment (UE), reporting of the BSR in the case that a triggering condition for reporting the BSR has been met; transmitting, by the relay UE, the BSR to a network device; wherein the triggering, by a relay User Equipment (UE), reporting of the BSR in the case that a triggering condition for reporting the BSR has been met comprises: triggering, by the relay UE, the reporting of the BSR in the case that a first triggering condition for reporting the BSR has been met in data service transmission performed by a relayed-to-UE with the network device through the relay UE; wherein the triggering, by the relay UE, the reporting of the BSR in the case that the first triggering condition for reporting the BSR has been met in the data service transmission performed by the relayed-to UE with the network device through the relay UE comprises at least one of: when Sidelink Control Information (SCI) has been received by the relay UE from the relayed-to UE and reserved resource is indicated in the SCI, triggering, by the relay UE, the reporting of the BSR; when the relay UE has received the SCI from the relayed-to UE, has not received data successfully, and has fed back to the relayed-to UE a message indicating that the data has been received unsuccessfully, triggering, by the relay UE, the reporting of the BSR; when the relay UE has received a request for accessing a network from the relayed-to UE, or when a process of requesting, by the relayed-to UE, to access the network has been completed, or when the relay UE has received a Sidelink connection establishment request from the relayed-to UE, or when a Sidelink connection between the relay UE and the relayed-to UE has been established successfully, triggering, by the relay UE, the reporting of the BSR; wherein the reserved resource indicated in the SCI is reserved for N times of transmission after current transmission, where N is greater than or equal to 1.
  2. 2 . The method according to claim 1 , wherein the triggering, by the relay UE, the reporting of the BSR in the case that the triggering condition for reporting the BSR has been met further comprises: triggering, by the relay UE, the reporting of the BSR in the case that a second triggering condition for reporting the BSR has been met in the data service transmission performed by a first relayed-to UE with a second relayed-to UE through the relay UE.
  3. 3 . The method according to claim 1 , wherein the data service transmission performed by the relayed-to UE with the network device through the relay UE comprises: uplink transmission performed by the relayed-to UE for transmitting a data service to the network device through the relay UE; or downlink transmission performed by the relayed-to UE for receiving a data service from the network device through the relay UE.
  4. 4 . The method according to claim 1 , wherein a buffer size of the BSR is a specific value or a maximum value of a size of data capable of being transmitted through the reserved resource indicated in the SCI; or the buffer size of the BSR is a specific value or a maximum value of a size of data capable of being transmitted through a Sidelink resource indicated in the SCI; or the buffer size of the BSR is a value of a size of data or signaling expected to be transmitted by the relayed-to UE in future.
  5. 5 . The method according to claim 1 , wherein a time for triggering the BSR is determined in accordance with a time for the reserved resource indicated in the SCI; or the time for triggering the BSR is determined in accordance with a time for a message fed back by the relay UE to the relayed-to UE and indicating that the data has been received unsuccessfully; or the time for triggering the BSR is determined in accordance with at least one of a time when the request for accessing the network has been received from the relayed-to UE, a time when the process of requesting, by the relayed-to UE, to access the network has been completed, a time when the Sidelink connection establishment request has been received by the relay UE from the relayed-to UE, or a time when the Sidelink connection has been established successfully between the relay UE and the relayed-to UE.
  6. 6 . The method according to claim 3 , wherein the triggering, by the relay UE, the reporting of the BSR in the case that the first triggering condition for reporting the BSR has been met in the downlink transmission performed by the relayed-to UE for receiving the data service from the network device through the relay UE comprises at least one of: when SCI has been transmitted by the relay UE to the relayed-to UE, triggering, by the relay UE, the reporting of the BSR; when the SCI transmitted by the relay UE to the relayed-to UE indicates that a quantity of times of transmission possibly to be performed in future, triggering, by the relay UE, the reporting of the BSR; when Downlink Control Information (DCI) received by the relay UE from the network device indicates data for downlink transmission, triggering, by the relay UE, the reporting of the BSR; when the relay UE has transmitted a connection establishment request message to the relayed-to UE or has received a connection establishment request message from the relayed-to UE, triggering, by the relay UE, the reporting of the BSR; or when the relay UE has received a network paging message for the relayed-to UE or has received a system message or a system message update indication about an air interface between the relay UE and the network device, triggering, by the relay UE, the reporting of the BSR.
  7. 7 . The method according to claim 6 , wherein a buffer size of the BSR is a specific value or a maximum value of a size of data capable of being transmitted through reserved resource or data possibly to be transmitted in future that is indicated in the SCI; or the buffer size of the BSR is any value of a size of data for downlink transmission indicated in the DCI or a value greater than the value of the size of the data for the downlink transmission; or the buffer size of the BSR is any value of a buffer size occupied by control signaling expected to be transmitted subsequently; or the buffer size of the BSR is any value of a size of data expected to be transmitted in future by a network or any value of a size of the system message.
  8. 8 . The method according to claim 6 , wherein a time for triggering the BSR by the relay UE is determined in accordance with a time for transmitting the SCI by the relay UE to the relayed-to UE; or the time for triggering the BSR by the relay UE is determined in accordance with a time for the transmission possibly to be performed in future or a time for the reserved resource indicated in the SCI by the relay UE; or the time for triggering the BSR by the relay UE is determined in accordance with a time when the DCI is received by the relay UE; or the time for triggering the BSR by the relay UE is determined in accordance with a time when the connection establishment request message is transmitted by the relay UE to the relayed-to UE or the connection establishment request message is received by the relay UE from the relayed-to UE; or the time for triggering the BSR by the relay UE is determined in accordance with a time when the relay UE receives the network paging message for the relayed-to UE or a time when the relay UE receives the system message or the system message update indication from the network.
  9. 9 . The method according to claim 2 , wherein the triggering, by the relay UE, the reporting of the BSR in the case that the second triggering condition for reporting the BSR has been met in the data service transmission performed by the first relayed-to UE with the second relayed-to UE through the relay UE comprises at least one of: when the relay UE has received SCI from the first relayed-to UE or the second relayed-to UE and reserved resource is indicated in the SCI, triggering, by the relay UE, the BSR; when the relay UE has fed back a message indicating that data has been received unsuccessfully to the first relayed-to UE or the second relayed-to UE, triggering, by the relay UE, the BSR; when the relay UE has transmitted the SCI to the first relayed-to UE or the second relayed-to UE, triggering, by the relay UE, the BSR; when the SCI transmitted by the relay UE to the first relayed-to UE or the second relayed-to UE indicates the quantity of times of transmission possibly to be performed in future, triggering, by the relay UE, the BSR; or when the relay UE has transmitted a connection establishment request message to the first relayed-to UE or the second relayed-to UE or has received a connection establishment request message from the first relayed-to UE or the second relayed-to UE, triggering, by the relay UE, the BSR.
  10. 10 . The method according to claim 9 , wherein the reserved resource indicated in the SCI is reserved for N times of transmission after current transmission, where N is a greater than or equal to 1.
  11. 11 . The method according to claim 9 , wherein a buffer size of the BSR is a specific value or a maximum value of a size of data capable of being transmitted through the reserved resource indicated in the SCI; or the buffer size of the BSR is a specific value or a maximum value of a size of data capable of being transmitted through a Sidelink resource indicated in the SCI; or the buffer size of the BSR is the buffer size occupied by control signaling expected to be transmitted subsequently.
  12. 12 . The method according to claim 9 , wherein a time for triggering the BSR by the relay UE is determined in accordance with a time for the reserved resource indicated in the SCI; or the time for triggering the BSR by the relay UE is determined in accordance with a time for feeding back a message indicating that the data has been received unsuccessfully; or the time for triggering the BSR by the relay UE is determined in accordance with a time when the SCI is transmitted by the relay UE to the first relayed-to UE or the second relayed-to UE; or the time for triggering the BSR by the relay UE is determined in accordance with a time that is for the transmission possibly to be performed in future and is indicated by the relay UE in the SCI; or the time for triggering the BSR by the relay UE is determined in accordance with a time when the connection establishment request message is transmitted by the relay UE to the first relayed-to UE or the second relayed-to UE or a time when the connection establishment request message is received by the relay UE from the first relayed-to UE or the second relayed-to UE.
  13. 13 . A relay UE, comprising a transceiver, a processor, a memory and a program instruction stored in the memory and capable of being executed by the processor, wherein the program instruction, when executed by the processor, causes the processor to implement: triggering reporting of the BSR in the case that a triggering condition for reporting the BSR has been met; and transmitting the BSR to a network device; wherein the triggering reporting of the BSR in the case that a triggering condition for reporting the BSR has been met comprises: wherein triggering, by the relay UE, the reporting of the BSR in the case that a first triggering condition for reporting the BSR has been met in data service transmission performed by a relayed-to-UE with the network device through the relay UE; wherein the triggering the reporting of the BSR in the case that the first triggering condition for reporting the BSR has been met in the data service transmission performed by the relayed-to UE with the network device through the relay UE comprises at least one of: when SCI has been received by the relay UE from the relayed-to UE and reserved resource is indicated in the SCI, triggering, by the relay UE, the reporting of the BSR; when the relay UE has received the SCI from the relayed-to UE, has not received data successfully, and has fed back to the relayed-to UE a message indicating that the data has been received unsuccessfully, triggering, by the relay UE, the reporting of the BSR; when the relay UE has received a request for accessing a network from the relayed-to UE, or when a process of requesting, by the relayed-to UE, to access the network has been completed, or when the relay UE has received a Sidelink connection establishment request from the relayed-to UE, or when a Sidelink connection between the relay UE and the relayed-to UE has been established successfully, triggering, by the relay UE, the reporting of the BSR; wherein the reserved resource indicated in the SCI is reserved for N times of transmission after current transmission, where N is greater than or equal to 1.
  14. 14 . The relay UE according to claim 13 , wherein the triggering reporting of the BSR in the case that a triggering condition for reporting the BSR has been met comprises: triggering the reporting of the BSR in the case that a second triggering condition for reporting the BSR has been met in the data service transmission performed by a first relayed-to UE with a second relayed-to UE through the relay UE.
  15. 15 . The relay UE according to claim 13 , wherein the data service transmission performed by the relayed-to UE with the network device through the relay UE comprises: uplink transmission performed by the relayed-to UE for transmitting a data service to the network device through the relay UE; or downlink transmission performed by the relayed-to UE for receiving a data service from the network device through the relay UE.
  16. 16 . The relay UE according to claim 13 , wherein a buffer size of the BSR is a specific value or a maximum value of a size of data capable of being transmitted through the reserved resource indicated in the SCI; or the buffer size of the BSR is a specific value or a maximum value of a size of data capable of being transmitted through a Sidelink resource indicated in the SCI; or the buffer size of the BSR is a value of a size of data or signaling expected to be transmitted by the relayed-to UE in future.
  17. 17 . The relay UE according to claim 13 , wherein a time for triggering the BSR is determined in accordance with a time for the reserved resource indicated in the SCI; or the time for triggering the BSR is determined in accordance with a time for a message fed back by the relay UE to the relayed-to UE and indicating that the data has been received unsuccessfully; or the time for triggering the BSR is determined in accordance with at least one of a time when the request for accessing the network has been received from the relayed-to UE, a time when the process of requesting, by the relayed-to UE, to access the network has been completed, a time when the Sidelink connection establishment request has been received by the relay UE from the relayed-to UE, or a time when the Sidelink connection has been established successfully between the relay UE and the relayed-to UE.
  18. 18 . The relay UE according to claim 15 , wherein the triggering, by the relay UE, the reporting of the BSR in the case that the first triggering condition for reporting the BSR has been met in the downlink transmission performed by the relayed-to UE for receiving the data service from the network device through the relay UE comprises at least one of: when SCI has been transmitted by the relay UE to the relayed-to UE, triggering, by the relay UE, the reporting of the BSR; when the SCI transmitted by the relay UE to the relayed-to UE indicates that a quantity of times of transmission possibly to be performed in future, triggering, by the relay UE, the reporting of the BSR; when Downlink Control Information (DCI) received by the relay UE from the network device indicates data for downlink transmission, triggering, by the relay UE, the reporting of the BSR; when the relay UE has transmitted a connection establishment request message to the relayed-to UE or has received a connection establishment request message from the relayed-to UE, triggering, by the relay UE, the reporting of the BSR; or when the relay UE has received a network paging message for the relayed-to UE or has received a system message or a system message update indication about an air interface between the relay UE and the network device, triggering, by the relay UE, the reporting of the BSR.
  19. 19 . The relay UE according to claim 18 , wherein a buffer size of the BSR is a specific value or a maximum value of a size of data capable of being transmitted through reserved resource or data possibly to be transmitted in future that is indicated in the SCI; or the buffer size of the BSR is any value of a size of data for downlink transmission indicated in the DCI or a value greater than the value of the size of the data for the downlink transmission; or the buffer size of the BSR is any value of a buffer size occupied by control signaling expected to be transmitted subsequently; or the buffer size of the BSR is any value of a size of data expected to be transmitted in future by a network or any value of a size of the system message.
  20. 20 . The relay UE according to claim 18 , wherein a time for triggering the BSR by the relay UE is determined in accordance with a time for transmitting the SCI by the relay UE to the relayed-to UE; or the time for triggering the BSR by the relay UE is determined in accordance with a time for the transmission possibly to be performed in future or a time for the reserved resource indicated in the SCI by the relay UE; or the time for triggering the BSR by the relay UE is determined in accordance with a time when the DCI is received by the relay UE; or the time for triggering the BSR by the relay UE is determined in accordance with a time when the connection establishment request message is transmitted by the relay UE to the relayed-to UE or the connection establishment request message is received by the relay UE from the relayed-to UE; or the time for triggering the BSR by the relay UE is determined in accordance with a time when the relay UE receives the network paging message for the relayed-to UE or a time when the relay UE receives the system message or the system message update indication from the network.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is the U.S. national phase of PCT Application No. PCT/CN2021/105511 filed on Jul. 9, 2021, which claims a priority of the Chinese patent application No. 202010656987.8 filed in China on Jul. 9, 2020, both of which are incorporated by reference herein. TECHNICAL FIELD The present disclosure relates to the field of communication technology, in particular to a method and a device for reporting a Buffer Status Report (BSR), and a relay User Equipment (UE). BACKGROUND In related art, as shown in FIG. 1, a cellular network communication mode is adopted, i.e., uplink/downlink data and/or control information is transmitted between a UE and a network device via a Uu interface. As shown in FIG. 2, Sidelink communication refers to data transmission between neighboring UEs within a short range through Sidelink (also known as PC5). A radio interface corresponding to the Sidelink is called as a Sidelink interface or a PC5 interface. FIG. 3 shows a UE-to-network relay mode. In order to extend a network coverage, one solution lies in the introduction of a relay. The relay is a UE having a relay function. For UE-to-network relay, a Uu interface is used between the relay and the network, and a PC5 interface (also called as Sidelink interface in the protocol) is used between the relay and a relayed-to UE. A link between the relay and the network is called as backhaul link for the relayed-to UE. FIG. 4 shows a UE-to-UE relay mode. For UE-to-UE relay, a Sidelink interface is used between a relay UE and a relayed-to UE. For UE-to-network relay, a Uu interface is used between the relay and the network, and a PC5 interface (also called as Sidelink interface in the protocol) is used between the relay and a relayed-to UE. A link between the relay and the network is called as backhaul link for the relayed-to UE. SUMMARY An object of the present disclosure is to provide a method and a device for reporting a BSR, and a relay UE, so as to enable a UE to apply to a network device for resource as soon as possible, thereby to transmit a service rapidly through the resource. In order to solve the above-mentioned problem, the present disclosure provides the following technical solutions. In one aspect, the present disclosure provides in some embodiments a method for reporting a BSR, for a relay UE, including: triggering the reporting of the BSR in the case that a triggering condition for reporting the BSR has been met; and transmitting the BSR to a network device. In another aspect, the present disclosure provides in some embodiments a relay UE, including a transceiver, a processor, a memory, and a program instruction stored in the memory and executed by the processor. The processor is configured to execute the program instruction, so as to: trigger the reporting of the BSR in the case that a triggering condition for reporting the BSR has been met; and transmit the BSR to a network device. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a communication mode in an LTE system under centralized control of a network; FIG. 2 is a schematic view showing Device-to-Device (D2D) discovery/communication; FIG. 3 is a schematic view showing UE-to-network relay; FIG. 4 is a schematic view showing UE-to-UE relay; FIG. 5 is a flow chart of a method for reporting a BSR according to an embodiment of the present disclosure; FIG. 6 is a block diagram of a device for reporting a BSR according to an embodiment of the present disclosure; and FIG. 7 is a schematic view showing architecture of a relay UE for reporting a BSR according to an embodiment of the present disclosure. DETAILED DESCRIPTION Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. Currently, pre-emptive BSR (pBSR) is used by a relay node to apply to a base station node for resource in advance, so as to facilitate the relay node to forward information from its child node rapidly. A base station serves as a relay to forward information between base stations. A previous-level node of the relay node is a parent node, and a next-level node of the relay node is a child node. The pBSR is triggered when: (1) the relay node has received a BSR from its child node; (2) the relay node has transmitted Uplink (UL) grant to the child node. A specific format of the pBSR is the same as that of a conventional BSR, but the pBSR merely supports a long BSR format, and a buffer size thereof is a value of a size of data expected to be transmitted in future. Fo