Uplink Delay Status Reporting for XR Logical Channel Scheduling
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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 systems struggle with efficient management of uplink resources for delay status reporting and scheduling requests, leading to potential delays and reduced quality of service.
Innovation Solution
A terminal apparatus and base station apparatus are configured to receive and transmit radio resource control messages that include logical channel group identifiers and delay status report thresholds, triggering delay status reports and scheduling requests when necessary to optimize uplink resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If delay status reports are triggered frequently to ensure timely reporting, then reporting timeliness is improved, but uplink resource consumption increases
Solution Approach 1:
The patent introduces a threshold parameter for triggering delay status reports. The terminal apparatus compares the remaining time against this threshold and only triggers reports when the remaining time is less than or equal to the threshold, thereby reducing unnecessary reports while maintaining timeliness for critical data
Solution Approach 2:
The system dynamically adjusts reporting behavior based on real-time conditions. The terminal continuously monitors remaining time and triggers reports only when necessary (when remaining time ≤ threshold), creating a dynamic reporting mechanism that adapts to changing network conditions rather than using fixed frequent reporting
2Speed
If delay status reports are transmitted immediately when triggered, then reporting speed is improved, but uplink resource availability is reduced
Solution Approach 1:
The terminal apparatus performs preliminary determination of uplink resource availability before transmitting delay status reports. It checks whether uplink resources can accommodate the report and only transmits if resources are available, avoiding transmission failures and ensuring efficient resource utilization
Solution Approach 2:
The system incorporates feedback mechanisms where the terminal monitors uplink resource status and adjusts transmission decisions accordingly. When uplink resources are insufficient, the terminal waits for resources to become available or uses scheduling requests, creating a feedback loop that optimizes transmission timing
3Productivity
If scheduling requests are sent when uplink resources are insufficient, then resource allocation is improved, but transmission delay increases
Solution Approach 1:
The terminal sends scheduling requests as feedback to the base station when uplink resources are insufficient. This feedback mechanism allows the base station to allocate resources in advance, improving allocation efficiency while the terminal waits for resources to become available, managing the trade-off between allocation efficiency and transmission delay
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), trigger the DSR in a case where remaining time with respect to an earliest time limit for a certain data becomes below the threshold and the DSR for the certain data is not transmitted, and transmit the DSR or a scheduling request (SR).