5G NR Logical Channel Delay Reporting for XR Latency Control
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Solution Overview
Problem
Existing extended reality (XR) technologies in 5G NR require low latency and high reliability for optimal user experience, but current methods do not effectively manage data transmission to maintain these qualities.
Innovation Solution
A terminal apparatus and base station apparatus implement a mechanism to receive and transmit radio resource control (RRC) messages that configure logical channel groups (LCGs) and set delay status report (DSR) thresholds, triggering and canceling DSRs as needed to manage data transmission efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If delay status report (DSR) is triggered frequently to monitor data transmission delay, then reliability of data transmission is improved, but signaling overhead and system complexity increase
Solution Approach 1:
The patent changes the parameter of DSR triggering from continuous or frequent triggering to threshold-based triggering. The base station configures a delay threshold for each logical channel group, and the terminal only triggers DSR when the actual transmission delay exceeds this threshold. This parameter change reduces unnecessary signaling while maintaining reliability monitoring for delayed data.
Solution Approach 2:
The system implements self-service by having the terminal autonomously determine when to trigger DSR based on pre-configured thresholds provided by the base station. The terminal monitors its own buffer status and transmission delay, and automatically triggers DSR only when needed, reducing the need for continuous base station intervention and signaling overhead.
2Productivity
If threshold-based DSR triggering is implemented to reduce signaling overhead, then system efficiency is improved, but latency management capability deteriorates
Solution Approach 1:
The patent implements feedback by having the base station configure delay thresholds for each logical channel group and receiving DSR reports from the terminal when thresholds are exceeded. This feedback mechanism allows the base station to adjust thresholds and资源配置 based on actual transmission performance, maintaining effective latency management while reducing unnecessary signaling.
Solution Approach 2:
The base station performs preliminary action by pre-configuring delay thresholds for each logical channel group before data transmission begins. These pre-set thresholds enable the terminal to make quick decisions about when to trigger DSR without real-time base station intervention, improving response speed while maintaining latency control.
3Reliability
If multiple logical channel groups are monitored individually for DSR, then data transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing logical channels into multiple logical channel groups (LCGs), each with its own delay threshold configuration. This allows independent monitoring and control of different data types or priorities. The terminal maintains separate buffer status and delay tracking for each LCG, enabling fine-grained reliability management without overwhelming complexity through modular organization.
Data Source
AI summary
A terminal apparatus is configured to receive, from a base station apparatus, a radio resource control (RRC) message including information for configuring an identifier of a logical channel group (LCG) to which a logical channel (LCH) belongs, and information for indicating a threshold for triggering a delay status report (DSR) for the LCG, and trigger the DSR in a case where remaining time with respect to an earliest time limit for certain data becomes below the threshold and the DSR for the data of the LCG is not transmitted.