Terminal Delay Status Reporting for Logical Channel Group Latency
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Solution Overview
Problem
Existing buffer status reporting (BSR) procedures in terminal apparatuses provide insufficient information for radio resource allocation, particularly in low-latency applications like extended reality (XR), leading to inadequate resource allocation by base stations.
Innovation Solution
A terminal apparatus is equipped with a controller to determine the triggering of delay status reports (DSR) based on remaining time limits and threshold conditions, and a transmitter to send DSR and scheduling requests (SR) accordingly, enhancing the reporting of delay information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal apparatus transmits only buffer size information in the BSR, then the reporting procedure is simple, but the base station cannot appropriately allocate radio resources
Solution Approach 1:
The patent combines buffer size information and delay status information into a single reporting mechanism. The Delay Status Report (DSR) is integrated with the Buffer Status Report (BSR) framework, allowing the terminal to report both buffer size and delay status together. This merging resolves the contradiction by providing comprehensive information to the base station while maintaining a unified, manageable reporting procedure.
Solution Approach 2:
The BSR mechanism is enhanced to serve multiple functions: it continues to report buffer size information while also reporting delay status information through the DSR. This multi-functionality allows a single reporting procedure to address both resource allocation needs and delay sensitivity requirements, eliminating the need for separate reporting mechanisms.
2Reliability
If the terminal apparatus reports delay information in addition to buffer size, then the base station can appropriately allocate radio resources, but the information reporting complexity increases
Solution Approach 1:
The patent implements dynamic triggering mechanisms for the DSR based on delay threshold conditions. The terminal monitors delay status and triggers DSR transmission only when delay exceeds configured thresholds, rather than transmitting delay information continuously. This dynamic approach ensures reliable resource allocation information is provided when needed, while avoiding unnecessary reporting that would increase complexity.
Solution Approach 2:
The patent introduces configurable delay thresholds as parameters that control DSR triggering. By changing these threshold parameters, the system can adapt the reporting behavior to different service requirements. This parameter-based control allows the terminal to adjust reporting complexity based on actual delay conditions, providing high reliability when needed while maintaining lower complexity during normal operations.
3Loss of time
If the terminal transmits DSR frequently to ensure low latency reporting, then delay information is promptly provided, but uplink resource consumption increases
Solution Approach 1:
The patent implements periodic delay threshold checking with event-triggered DSR transmission. Instead of continuous monitoring and transmission, the terminal periodically evaluates whether delay exceeds the configured threshold and triggers DSR only when the condition is met. This periodic action with event triggering ensures timely delay reporting when critical while minimizing unnecessary transmissions that would consume uplink resources.
Data Source
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AI summary
A terminal apparatus (10) includes: a receiver (122) configured to receive, from a base station apparatus (20), a radio resource control (RRC) message including information for configuration of an identifier of a logical channel group (LCG) to which a logical channel (LCH) belongs, and information indicating a threshold for data of the LCG for control of triggering of a delay status report (DSR); a controller (110) configured to control the triggering of the DSR on the basis of that a remaining time with respect to an earliest time limit for the data of the LCG becomes below the threshold and the DSR for the data of the LCG is not transmitted; and a transmitter (121) configured to transmit the DSR and a scheduling request (SR).