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JP-7856571-B2 - Methods, apparatus, and computer program products for wireless communication

JP7856571B2JP 7856571 B2JP7856571 B2JP 7856571B2JP-7856571-B2

Inventors

  • マー，ウェイ
  • リウ，ホンジュン
  • ルー，チェン
  • マー，ズージアン
  • リー，ドンメイ
  • ウェン，ウー
  • ヂャン，ボーシャン

Assignees

  • 中興通訊股▲ふん▼有限公司

Dates

Publication Date
20260511
Application Date
20210114

Claims (17)

  1. A wireless communication method, A wireless communication method comprising the steps of: a first wireless communication node transmitting a control message to a second wireless communication node to instruct a wireless communication terminal to enter a wireless resource control (RRC) inactive mode; and controlling the second wireless communication node to transmit at least one small data transmission (SDT) configuration to the wireless communication terminal.
  2. The control message comprises an RRC message comprising the SDT configuration and an interruption instruction to cause the wireless communication terminal to enter the RRC inactive mode, and the second wireless communication node is configured to transparently transfer this RRC message to the wireless communication terminal. The wireless communication method according to claim 1, wherein the RRC message is an RRC release message.
  3. The wireless communication method according to claim 1 or 2, wherein the control message includes an information element for preventing the second wireless communication node from releasing information related to the wireless communication terminal.
  4. The wireless communication method according to any one of claims 1 to 3, wherein the information related to the wireless communication terminal is used for SDT between the wireless communication terminal and the second wireless communication node.
  5. The information related to the aforementioned wireless communication terminal is: At least one radio link control RLC entity for SDT between the wireless communication terminal and the second wireless communication node, or at least one RLC bearer configuration for SDT between the wireless communication terminal and the second wireless communication node, A wireless communication method according to any one of claims 1 to 4, comprising:
  6. The first wireless communication node is configured to send a request message to the second wireless communication node requesting SDT resources. The wireless communication method according to any one of claims 1 to 5, wherein the first wireless communication node is configured to receive a response message from the second wireless communication node indicating the result of the request for the SDT resource.
  7. The first wireless communication node is configured to receive a configuration complete message from the second wireless communication node indicating that the SDT resource has been configured and the wireless communication terminal has entered the RRC inactive mode. The wireless communication method according to any one of claims 1 to 6, wherein the SDT configuration comprises at least one SDT resource.
  8. A wireless communication method, The wireless communication terminal includes the step of receiving a wireless resource control RRC message from a second wireless communication node, The RRC message comprises at least one small data transmission SDT configuration and an interruption instruction to cause the wireless communication terminal to enter RRC inactive mode. A wireless communication method wherein the second wireless communication node is configured to refrain from releasing information related to the wireless communication terminal in accordance with a control message received from the first wireless communication node.
  9. The wireless communication method according to claim 8, wherein the control message includes an information element for preventing the second wireless communication node from releasing information related to the wireless communication terminal.
  10. The wireless communication method according to claim 8 or 9, wherein the control message comprises the RRC message, and the second wireless communication node is configured to transparently transfer the RRC message to the wireless communication terminal.
  11. The wireless communication method according to any one of claims 8 to 10, wherein the information related to the wireless communication terminal is used for SDT between the wireless communication terminal and the second wireless communication node.
  12. The information related to the aforementioned wireless communication terminal is: The wireless communication method according to any one of claims 8 to 11, comprising at least one wireless link control RLC entity for SDT between the wireless communication terminal and the second wireless communication node, or at least one RLC bearer configuration for SDT between the wireless communication terminal and the second wireless communication node.
  13. The wireless communication method according to any one of claims 8 to 12, wherein the SDT configuration comprises at least one SDT resource.
  14. The wireless communication method according to any one of claims 8 to 13, wherein the RRC message is an RRC release message.
  15. A wireless communication node, Communication unit and A wireless communication node comprising: a processor configured to perform the wireless communication method described in any one of claims 1 to 7.
  16. A wireless communication terminal, Communication unit and The system comprises a processor configured to receive radio resource control (RRC) messages from a second wireless communication node, The RRC message comprises at least one small data transmission SDT configuration and an interruption instruction to cause the wireless communication terminal to enter RRC inactive mode. The second wireless communication node is configured to refrain from releasing information related to the wireless communication terminal in accordance with a control message received from the first wireless communication node, and is a wireless communication terminal.
  17. The wireless communication terminal according to claim 16 , wherein the processor is further configured to perform the wireless communication method according to any one of claims 8 to 14.

Description

This document generally pertains to wireless communication. In the new radio frequency (NR) of 5G communication, the user equipment (UE) can enter the RRC_INACTIVE state/mode (also referred to as the INACTIVE state/mode in the following paragraphs) to reduce power consumption. Normally, in the RRC_INACTIVE state, the UE cannot transmit data. Therefore, the UE must re-establish connections for downlink (e.g., mobile terminal (MT)) and uplink (e.g., mobile source (MO)) data (i.e., return to the RRC_CONNECTED state). However, for small, infrequent data transmissions, establishing and releasing a connection each time transmission is required is inefficient and consumes power. Therefore, a method for transmitting small data in the RRC_INACTIVE state, as well as the associated configurations for network nodes and UEs, are required. A flowchart of a wireless communication method according to one embodiment of this disclosure is shown.A flowchart of another wireless communication method according to one embodiment of the present disclosure is shown.A flowchart of another wireless communication method according to one embodiment of the present disclosure is shown.A flowchart of another wireless communication method according to one embodiment of the present disclosure is shown.A flowchart of another wireless communication method according to one embodiment of the present disclosure is shown.A flowchart of another wireless communication method according to one embodiment of the present disclosure is shown.An example of a schematic diagram of a wireless communication terminal according to one embodiment of the present disclosure is shown.An example of a schematic diagram of another wireless communication node according to another embodiment of this disclosure is shown. Some terms used in this disclosure are defined below. SDT: Small Data Transmission or Specific Data Transmission. SDT Resource: An SDT resource can be one of the following: a pre-configured UL resource (PUR), a configured grant resource (CG), or any other pre-configured resource. SDT Configuration: An SDT configuration may include at least one of the following: at least one SDT resource, at least one SDT index, at least one SDT duration or SDT timer, or at least one SDT indicator. According to one embodiment of this disclosure, after receiving an RRC message from a user device (UE) requesting a Small Data Transmission (SDT) configuration, the gNB-CU (gNodeB Central Unit) can initiate an F1AP (F1 Application Protocol) procedure for SDT configuration (e.g., a UE context change procedure). If the SDT configuration request is successful, the gNB-DU (gNodeB Distributed Unit) can transmit the result of the SDT request to the gNB-CU and retain the UE context and DL (Downlink) CG (Cell Group) TNL (Transport Network Layer) address. Furthermore, the gNB-DU can execute an SDT timer for UL data transmission according to the SDT resources. In 5G's new radio frequency (NR), user equipment (UEs) can enter the RRC_INACTIVE state to reduce power consumption. Normally, in the RRC_INACTIVE state, the UE cannot transmit data. Therefore, the UE must re-establish connections for downlink (e.g., mobile terminal (MT)) and uplink (e.g., mobile source (MO)) data (i.e., return to the RRC_CONNECTED state). However, for small, infrequent data transmissions, establishing and releasing connections each time transmission is required is inefficient and power-consuming. Furthermore, signaling overhead is incurred. The signaling overhead in the UE's inactive state for Small Data Transmission (SDT) is a problem in 5G communications. Generally, devices that need to transmit or receive small data packets in the inactive state can benefit from adopting small data transmission in the inactive state. Several methods can be employed for SDT in an inactive state, including 2-step RACH (Random Access Channel), 4-step RACH, and configuration grant type-1 (CG type-1). Some embodiments of this disclosure can be implemented based on these methods. If the RRC_INACTIVE state is active: 1) UL small data transmission for RACH-based schemes (i.e., 2-step and 4-step RACH) is General procedure for enabling UP (User Plane) data transmission for small data packets from an INACTIVE state (e.g., using MsgA or Msg3), The INACTIVE state of MsgA and Msg3 allows for a more flexible payload size than the currently possible Rel-16CCCH message size to support UP data transmission in UL (actual payload size may depend on network configuration), and context fetching and data transfer in the INACTIVE state for RACH-based solutions (with and without anchor relocation). Please note that the security aspects of the above operations can be checked by the 3GPP® Security Working Group (SA3). 2) Transmission of UL data over a pre-configured PUSCH (Physical Uplink Shared Channel) resource (i.e., reusing configuration grant type 1) (for example, when TA (Timing Advance) is enabled) General procedure for sending small data from an