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JP-2026076183-A - Data transmission methods, equipment, and systems

JP2026076183AJP 2026076183 AJP2026076183 AJP 2026076183AJP-2026076183-A

Abstract

[Problem] To provide a data transmission method, equipment, and system. [Solution] In a data transmission method for a communication system, a serving access network device receives a first radio resource control (RRC) message from a terminal device (901). The first RRC message is used to establish a small data transmission (SDT). If the serving access network device does not meet the requirements for the SDT, it sends a second RRC message or a third RRC message to the terminal device (902). The second RRC message can be used to instruct the terminal device to terminate the SDT, and the third RRC message can be used to instruct the serving access network device to refuse to perform the SDT. [Selection Diagram] Figure 9

Inventors

  • ジャーン，ジエン

Assignees

  • オナー デバイス カンパニー リミテッド

Dates

Publication Date
20260511
Application Date
20251226
Priority Date
20220114

Claims (20)

  1. A data transmission method applicable to a serving access network device, wherein the method is: The steps include receiving a first radio resource control (RRC) message from a terminal device, wherein the first RRC message is used to establish a small data transmission (SDT), If the serving access network device does not meet the requirements of the SDT, the step of sending a second RRC message to the terminal device, wherein the second RRC message is used to indicate to the terminal device that the SDT is being terminated, and the serving access network device is not an anchor access network device, Includes, Before transmitting the second RRC message to the terminal device, the method A step of transmitting a fourth message to the anchor access network device, wherein the fourth message is used to request the anchor access network device to transmit the second RRC message to the serving access network device, A method further comprising the fourth message including a first cause value, the first cause value being used to indicate the reason why the serving access network device requests the anchor access network device to transmit the second RRC message.
  2. The fact that the Serving Access Network device does not meet the requirements of the SDT means that The method according to claim 1, wherein when the first RRC message is received, the serving access network device does not support the SDT, congestion occurs on the serving access network device, or the load on the serving access network device is greater than a threshold.
  3. The fact that the Serving Access Network device does not meet the requirements of the SDT means that The method according to claim 2, wherein the process of performing the SDT includes the occurrence of congestion in the serving access network device, or the load of the serving access network device being greater than the threshold.
  4. The method according to claim 1, wherein the second RRC message includes a waiting time, the waiting time indicating the period during which the terminal device waits before initiating the next communication connection.
  5. The method according to claim 1, wherein the second RRC message includes a first redirection parameter or a first cell reselection priority parameter, the first redirection parameter being used for redirection, and the first cell reselection priority parameter being used for cell reselection.
  6. A step of receiving a response message from the anchor access network device, wherein the response message includes the second RRC message, The method according to claim 1, further comprising:
  7. The method according to claim 6, wherein the response message is used to instruct the serving access network device to delete the context of the terminal device.
  8. A data transmission method applicable to an anchor access network device, wherein the method is: A step of receiving a message from a serving access network device, the message being used to request the anchor access network device to send a second RRC message to the serving access network device, The steps include: transmitting the second RRC message to the serving access network device, wherein the second RRC message is used to instruct the terminal device to terminate the SDT (small data transmission); Includes, A method wherein the message received from the serving access network device includes a first cause value, the first cause value being used to indicate the reason why the serving access network device requests the anchor access network device to transmit the second RRC message.
  9. The method according to claim 8, wherein the second RRC message includes a waiting time, the waiting time indicating the period during which the terminal device waits before initiating the next communication connection.
  10. The method according to claim 8, wherein the second RRC message includes a first redirection parameter or a first cell reselection priority parameter, the first redirection parameter being used for redirection, and the first cell reselection priority parameter being used for cell reselection.
  11. A data transmission method applicable to a terminal device, wherein the method is The steps include: transmitting a first radio resource control (RRC) message to a serving access network device, wherein the first RRC message is used to establish a small data transmission (SDT); The step of stopping the SDT timer upon receiving a second RRC message from the serving access network device, wherein the second RRC message is used to indicate to the terminal device that the SDT is being terminated. Includes, A method wherein the serving access network device is not an anchor access network device, and the serving access network device transmits a fourth message to the anchor access network device, the fourth message being used to request the anchor access network device to transmit the second RRC message to the serving access network device, the fourth message including a first cause value, the first cause value being used to indicate the reason why the serving access network device is requesting the anchor access network device to transmit the second RRC message.
  12. The method according to claim 11, wherein the first RRC message is an RRC restart request message, and the second RRC message is an RRC release message.
  13. The aforementioned method, A step of receiving the second RRC message transmitted by the serving access network device, wherein the second RRC message is included in a response message, and the response message is a response to the fourth message transmitted from the anchor access network device, The method according to claim 11, further comprising:
  14. When the second RRC message is received, the method Steps to notify higher levels of the end of SDT, The method according to claim 11, further comprising:
  15. If the second RRC message includes a suspend configuration, the method is: The method according to claim 11, further comprising the steps of suspending the context of the terminal device and restarting the RNA timer.
  16. After the terminal device transmits the first RRC message, the method Steps to start the SDT timer, The method according to claim 11, further comprising:
  17. The method according to claim 11, wherein the second RRC message includes a waiting time, the waiting time indicating the period during which the terminal device waits before initiating the next communication connection.
  18. The method according to claim 11, wherein the second RRC message includes a first redirection parameter or a first cell reselection priority parameter, the first redirection parameter being used for redirection, and the first cell reselection priority parameter being used for cell reselection.
  19. If there are unsent SDT data packets in the buffer of the terminal device, the method is as follows: Steps include: ignoring the waiting time, performing a redirect based on the first redirect parameter, triggering an SDT in the first cell, and transmitting the unsent SDT data packets in the buffer, wherein the first cell is a serving cell after the terminal device has performed the redirect; Steps include: ignoring the aforementioned waiting time, performing cell reselection based on the first cell reselection priority parameter, and triggering an SDT in a second cell to transmit the unsent SDT data packets in the buffer, wherein the second cell is a serving cell after the terminal device has performed the cell reselection; The method according to claim 18, further comprising:
  20. A data processing device, the data processing device includes a processor and a memory, The memory is configured to store computer executable instructions, and when the processor executes the computer executable instructions, the data processing device is enabled to execute the method according to any one of claims 1 to 19.

Description

[Related applications] This application claims priority to China Patent Application No. 202210043783.6, filed with the China National Intellectual Property Administration on 14 January 2022, titled "DATA TRANSMISSION METHOD, APPARATUS, AND SYSTEM," which is incorporated herein by reference in its entirety. [Technical Field] Embodiments of this application relate to the field of communication technology, and more particularly to data transmission methods, equipment, and systems. In fifth-generation new radio (5GNR) systems, an RRC inactive (RRC_INACTIVE) state is introduced at the radio resource control (RRC) layer. User equipment (UE) may enter the RRC inactive state when there is no data transmission. If the UE is transmitting data, it may switch from the RRC inactive state to the RRC connected (RRC_CONNECTED) state and continue transmitting data. In a certain transmission scenario, the data packets transmitted by the UE are very small, but because these data packets are transmitted frequently, the UE needs to frequently switch the RRC state. This occupies a large amount of signaling resources. However, occupying a large amount of signaling resources to transmit small data packets leads to a waste of signaling resources. To solve this problem, conventional technology has proposed SDT (small data transmission) technology, which allows the UE to transmit data in an RRC-inactive state. This application provides a data transmission method, apparatus, and system, offering a processing solution for use when, for example, a serving base station or anchor base station fails to meet SDT requirements due to resource congestion at the serving base station or overload at the anchor base station. This invention does not limit the reasons why a serving base station or anchor base station might fail to meet the requirements for performing SDT. To achieve the aforementioned objectives, the following technical solutions are used in this application. According to the first embodiment, a data transmission method is provided. The data transmission method is often applied to a serving access network device, and the data transmission method is First, a step of receiving a first RRC message from a terminal device, wherein the first RRC message is used to establish an SDT, and For example, if the Serving Access Network device does not meet the requirements of the SDT due to resource congestion or network load, the step of sending a second RRC message or a third RRC message to the terminal device, wherein the second RRC message can be used to instruct the terminal device to terminate the SDT, and the third RRC message can be used to instruct the Serving Access Network device to refuse to perform the SDT, It can include... Based on this solution, if the serving access network device does not meet the requirements for performing SDT, it can promptly reject or terminate the SDT, and the terminal device can then re-select a cell and start SDT again. Compared to solutions where the terminal device remains waiting in the current cell, this can reduce latency and improve the data transmission efficiency of the terminal device. Referring to the first embodiment, in possible implementations, the Serving Access Network device does not satisfy the requirements of the SDT. When the first RRC message is received, it may include the fact that the serving access network device does not support the SDT, that congestion occurs on the serving access network device, or that the load on the serving access network device is greater than a threshold. Referring to the first embodiment, in possible implementations, the Serving Access Network device does not satisfy the requirements of the SDT. The process of executing the SDT may include the occurrence of congestion on the serving access network device, or the load on the serving access network device being greater than the threshold. Based on the two implementations described above, if the Serving Access Network (SDT) device fails to meet the SDT requirements when SDT establishment is requested, or during the SDT execution process, subsequent SDT procedures can be terminated or rejected, thereby improving the applicability and flexibility of the solution. Referring to the first embodiment, in possible implementations, each of the second RRC message and the third RRC message includes a waiting time, the waiting time indicating the period during which the terminal device waits before initiating the next communication connection. Based on this solution, the terminal device can immediately re-select the current cell after initiating a communication connection, thus avoiding another SDT failure. Referring to the first embodiment, in possible implementations, the second RRC message includes a first redirection parameter or a first cell reselection priority parameter, wherein the first redirection parameter is used for redirection, and the first cell reselection priority parameter is used for cell reselection.