QoS Flow-to-DRB Remapping After PDU Set Completion for XR
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Solution Overview
Problem
Existing methods for updating data flow mapping relationships in 5G systems cause transmission delays and interruptions in extended reality (XR) services due to immediate changes in the mapping relationship between quality of service (QoS) flows and data radio bearers (DRBs), particularly affecting XR services that require low latency and high reliability.
Innovation Solution
The method involves postponing the remapping process of QoS flows to DRBs until the completion of transmission of a packet data unit (PDU) set, ensuring associated PDUs are transmitted through the same DRB, thereby avoiding delays and interruptions by delaying the transmission of the SDAP End-Marker Control PDU until the PDU set is finished.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mapping relationship between QoS flow and DRB is updated immediately, then the mapping relationship can be changed quickly to adapt to network conditions, but transmission delays and interruptions occur in XR services
Solution Approach 1:
The base station sends mapping relationship change information to the terminal in advance, allowing the terminal to prepare for the mapping change. However, the actual remapping is postponed until after PDU set transmission completes, resolving the contradiction by preparing early but executing later to maintain transmission reliability during the critical PDU transmission period.
2Speed
If the SDAP End-Marker Control PDU is transmitted immediately to indicate mapping change, then the base station can update the mapping relationship quickly, but data delays or interruptions are caused during the update process
Solution Approach 1:
The base station performs preliminary action by sending mapping relationship change information before the terminal actually remaps the QoS flow to the new DRB. The terminal receives this information early but delays the actual remapping operation until after completing PDU set transmission, thereby avoiding transmission delays while still preparing for quick adaptation when needed.
Solution Approach 2:
The patent ensures continuous transmission of PDUs through the same DRB during the mapping change process. By postponing the remapping until after PDU set transmission completes, the system maintains continuous data flow without interruptions or delays, resolving the contradiction between fast update capability and transmission continuity.
3Productivity
If multiple PDUs in a data frame are transmitted on different DRBs after mapping change, then the system can utilize multiple bearers for load balancing, but associated PDUs cannot be transmitted together causing data delays
Solution Approach 1:
The base station sends mapping relationship change information as a preliminary action before the terminal begins transmitting PDUs on the new DRB. This allows the terminal to prepare the mapping change but actually executes it after completing the current PDU set transmission, ensuring all associated PDUs in a data frame are transmitted together on the same DRB, maintaining both throughput efficiency and data integrity.
Data Source
AI summary
The present disclosure provides a method and an apparatus for data flow mapping update, and a storage medium. The method includes: receiving mapping relationship change information, where the mapping relationship change information is configured as a representation for mapping a target QoS flow to a second DRB, the second DRB being a DRB other than a first DRB to which the target QoS flow is mapped before a mapping relationship is changed; and upon completion of transmission, on the first DRB, of a PDU set under current transmission in the target QoS flow, mapping the target QoS flow to the second DRB, to avoid transmission delays or interruptions caused by a change in the mapping relationship between the QoS flow and the DRB, and improving the reliability of service data transmission.