JP-2026514438-A - User equipment and methods

Abstract

Embodiments of this disclosure relate to an apparatus, method, and computer-readable medium for packet discarding. A terminal device acquires a strategy for performing importance-based packet discarding. The terminal device performs importance-based packet discarding based on its determination that importance-based packet discarding is activated. The terminal device prevents the performance of importance-based packet discarding based on its determination that importance-based packet discarding is deactivated, where importance-based packet discarding is performed based on the importance of the packet. In this way, the terminal device can discard packets based on their importance. This reduces transmission delay and improves communication performance. [Selection Diagram] Figure 5

Inventors

• ワン ガン

Assignees

• 日本電気株式会社

Dates

Publication Date

20260511

Application Date

20230331

Claims (20)

1. A method for communication, In terminal devices, to obtain a strategy for performing packet discarding based on importance, Based on the determination that packet discarding based on the aforementioned importance is activated, the packet discarding based on the aforementioned importance is performed. Preventing the execution of packet dropping based on importance, based on the determination that packet dropping based on importance is deactivated, wherein packet dropping based on importance is performed based on the importance of the packet. A method of communication.
2. The aforementioned strategy is as follows: Packets with lower importance are discarded before packets with higher importance are discarded. The first packet among multiple packets of the same importance is discarded before the second packet among the multiple packets acquired after the first packet is discarded, or a Service Data Unit (SDU) or Packet Data Unit (PDU) belonging to a Packet Data Unit (PDU) set is discarded as a whole if the SDU or PDU is necessary for the use of the PDU set. Including at least one of the following: The method according to claim 1.
3. The terminal device receives information from the network device to determine the number of packets that will be discarded. The process further includes determining the number of packets to be discarded based on the aforementioned information, Here, the aforementioned information is as follows: The ratio of the number of packets discarded to the total number of packets. The ratio of the size of discarded packets to the total size of packets. The total number of packets to be discarded, or the total size of packets to be discarded. Including at least one of the following: The method according to claim 1 or 2.
4. The packets having a severity level are instructed or determined to be discarded, and discarding at least one of the packets is as follows: This includes at least one of the following: discarding all packets having the aforementioned severity level, or discarding a portion of packets having the aforementioned severity level until the number of packets to be discarded is reached. The method according to any one of claims 1 to 3.
5. Determining that packet discarding based on the aforementioned severity is activated means the following: Receiving instructions from a network device to activate packet discarding based on the aforementioned importance, or determining that the packet discarding rate in the terminal device exceeds a threshold received from the network device. Including at least one of the following: The method according to any one of claims 1 to 4.
6. Determining that packet discarding based on the aforementioned severity is deactivated means the following: Receiving instructions from the network device to deactivate packet discarding based on the importance level, or determining that the packet discarding rate in the terminal device is below a threshold received from the network device. Including at least one of the following: The method according to any one of claims 1 to 5.
7. The threshold is received via a Radio Resource Control (RRC) message, and the instruction is as follows: Packet Data Convergence Protocol (PDCP) Controlled PDU Medium Access Control (MAC) control element (CE), Received via at least one of the following: Downlink Control Information (DCI) or Service Data Adaptation Protocol (SDAP) control PDU, The method according to claim 5 or 6.
8. The above instructions are as follows: A subfield indicating the importance of at least one packet that will be discarded. A subfield indicating the percentage of packets that are discarded. A subfield indicating the number or size of packets to be dropped, or a subfield indicating at least one identifier of at least one Quality of Service (QoS) for which packet dropping based on the severity is activated or deactivated, Including at least one of the following: The method according to any one of claims 5 to 7.
9. The instruction is received via the PDCP control PDU, and the instruction is as follows: The system further includes at least one of the following: a subfield indicating the type of PDU, or a subfield indicating whether to activate or deactivate packet dropping based on the severity. The method according to any one of claims 5 to 8.
10. The above instructions are received via MAC CE, and the instructions are as follows: The subfield further includes at least one of the following: a subfield indicating at least one identifier of at least one data radio bearer (DRB) for which the aforementioned severity-based packet discarding is activated or deactivated; or a subfield indicating the activation or deactivation status of at least one DRB configured with the aforementioned severity-based packet discarding. The method according to any one of claims 5 to 9.
11. The instruction is received via DCI, and the instruction is, The following further includes a subfield indicating whether to activate or deactivate packet dropping based on the aforementioned severity: The method according to any one of claims 5 to 10.
12. The aforementioned instruction is received via the SDAP control PDU, and the instruction is as follows: A subfield indicating the type of PDU, The subfield further includes at least one of the following: a subfield indicating whether to activate or deactivate packet dropping based on severity, or a subfield indicating at least one identifier of at least one quality of service (QoS) for which packet dropping based on severity is activated or deactivated. The method according to any one of claims 5 to 11.
13. The aforementioned instructions are further received via RRC messages, and the instructions are as follows: A subfield indicating the percentage of packets that are discarded. A subfield indicating whether to activate or deactivate packet discarding based on the aforementioned importance level, A subfield including at least one of the following: a subfield showing a percentage list of packets to be dropped, or a subfield showing at least one identifier of at least one quality of service (QoS) for which packet dropping based on severity is activated or deactivated, The method according to any one of claims 5 to 12.
14. The aforementioned discard rate is as follows: The ratio of the number of packets discarded due to the expiration of the discard timer to the total number of packets, or the ratio of the size of packets discarded due to the expiration of the discard timer to the total size of packets. Including at least one of the following: The method according to claim 5 or 6.
15. The threshold is one of a plurality of thresholds received from the network device, and the plurality of thresholds correspond to a plurality of congestion levels and a plurality of discard rates, respectively. The method according to any one of claims 5 to 7.
16. A method for communication, In network devices, the terminal device determines a strategy for performing packet discarding based on importance, Transmitting the aforementioned strategy to the terminal device, Based on the determination that packet discarding based on the aforementioned importance is activated, an instruction is sent to the terminal device to activate packet discarding based on the aforementioned importance. Based on the determination that packet discarding based on importance is deactivated, the terminal device is instructed to deactivate packet discarding based on importance, wherein packet discarding based on importance is performed based on the importance of the packets. A method of communication.
17. The aforementioned strategy is as follows: Packets with lower importance are discarded before packets with higher importance are discarded. A first packet among multiple packets of the same importance is discarded before a second packet among the multiple packets acquired after the first packet is discarded, or a service data unit (SDU) or packet data unit (PDU) belonging to a PDU set is discarded as a whole if the SDU or PDU is necessary for the use of the PDU set. Including at least one of the following: The method according to claim 16.
18. The terminal device determines information for determining the number of packets to be discarded, The further includes transmitting the aforementioned information to the terminal device, Here, the aforementioned information is as follows: The ratio of the number of packets discarded to the total number of packets. The ratio of the size of discarded packets to the total size of packets. Total number of packets to be discarded, Total size of packets to be discarded, Including at least one of the following: The method according to claim 16 or 17.
19. The terminal device determines one or more thresholds for activating or deactivating packet discarding based on the severity, wherein the one or more thresholds correspond to one or more packet discard rates and one or more congestion levels in the terminal device, respectively. The further includes transmitting one or more thresholds to the terminal device, The method according to any one of claims 16 to 18.
20. The threshold is transmitted via a Radio Resource Control (RRC) message, and the instruction is as follows: RRC message, Packet Data Convergence Protocol (PDCP) Controlled PDU Media Access Control (MAC) control element (CE), Transmitted via at least one of the following: Downlink Control Information (DCI) or Service Data Adaptive Protocol (SDAP) Control PDU The method according to any one of claims 16 to 19.

Description

Embodiments of this disclosure generally relate to the field of communications, and more particularly to methods, apparatus, and computer-readable media for packet discarding. Currently, research projects are underway to enhance Extended Reality (XR). It is being discussed that XR awareness by User Equipment (UE) and gNB will improve the user experience, increase New Radio (NR) system capacity when supporting XR services, and reduce UE power consumption. Due to Internet Protocol (IP) segmentation or other reasons, video frames in XR traffic may arrive at the Radio Access Network (RAN) as groups of packets, and these video frames may also be received from the application layer as groups of packets. Data bursts can occur during XR traffic transmission. Packet dropping is an effective method to mitigate data bursts. However, packet dropping is still imperfect and requires further development. Generally, exemplary embodiments of this disclosure provide methods, apparatus, and computer-readable media for packet discarding. In the first embodiment, a method for communication is provided. This method includes, in a terminal device, acquiring a strategy for performing importance-based packet discarding, determining that importance-based packet discarding is activated, performing importance-based packet discarding, and preventing the performance of importance-based packet discarding based on determining that importance-based packet discarding is deactivated, wherein the importance-based packet discarding is performed based on the importance of the packets. In a second embodiment, a method for communication is provided. This method includes, in a network device, determining a strategy for a terminal device to perform importance-based packet discarding; transmitting the strategy to the terminal device; determining that importance-based packet discarding is activated, transmitting an instruction to the terminal device to activate importance-based packet discarding; and determining that importance-based packet discarding is deactivated, transmitting an instruction to the terminal device to deactivate importance-based packet discarding, wherein the importance-based packet discarding is performed based on the importance of the packets. In a third embodiment, a terminal device is provided. The terminal device comprises a processor and a memory for storing computer program code. The memory and the computer program code, together with the processor, are configured to cause the terminal device to execute the method according to the first embodiment. In a fourth embodiment, a network device is provided. The network device comprises a processor and a memory for storing computer program code. The memory and the computer program code, together with the processor, are configured to cause the network device to execute the method according to the second embodiment. In the fifth aspect, a computer-readable medium containing instructions is provided, and when these instructions are executed by the device's processor, the device is instructed to perform the method according to the first or second aspect. It should be understood that the summary portion of the invention is not intended to identify any important or essential features of the embodiments of this disclosure, nor is it intended to be used to limit the scope of this disclosure. Other features of this disclosure will be readily apparent through the following description. The above and other objectives, features, and advantages of this disclosure will become clearer through a more detailed description of some embodiments of this disclosure in the accompanying drawings. This disclosure shows exemplary network environments in which several embodiments of this disclosure can be implemented. An exemplary signaling chart illustrating an exemplary process according to several embodiments of this disclosure is shown. The following are exemplary Packet Data Convergence Protocol (PDCP) controlled packet data unit (PDU) formats according to several embodiments of the present disclosure. The following are exemplary medium access control (MAC) control element (CE) formats according to several embodiments of the present disclosure. A flowchart shows a method implemented in a terminal device according to several embodiments of this disclosure. A flowchart shows a method implemented in a network device according to several other embodiments of this disclosure. This is a simplified block diagram of an apparatus suitable for carrying out embodiments of the present disclosure. Throughout the drawings, identical or similar reference numerals represent identical or similar elements. Herein, the principles of this disclosure will be described with reference to several exemplary embodiments. These embodiments are provided for illustrative purposes only and are intended to help those skilled in the art to understand and implement this disclosure without implying any limitation on its scope. The discl