Terminal Delay Status Reporting for Low-Latency Radio Allocation
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Solution Overview
Problem
Existing buffer status reporting (BSR) procedures in terminal apparatuses provide insufficient information for appropriate radio resource allocation, particularly in low-latency environments like extended reality (XR), leading to suboptimal resource management.
Innovation Solution
A terminal apparatus is configured to receive an RRC message with LCG identifiers and delay status report (DSR) thresholds, controlling the triggering of DSR based on remaining time limits, and cancelling triggered DSRs that expire, enabling more precise reporting of delay information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the terminal apparatus transmits only buffer size information in BSR, then the reporting overhead is reduced, but the base station cannot appropriately allocate radio resources
Solution Approach 1:
The patent segments the delay status report into a trigger condition indicator and a remaining time indicator, which are transmitted separately. The trigger condition indicator is included in the BSR, while the remaining time indicator is transmitted only when specific conditions are met. This segmentation allows the system to reduce reporting overhead by not always transmitting delay information, while still providing complete information when needed for appropriate radio resource allocation.
Solution Approach 2:
The patent implements partial action by transmitting delay status information only when necessary (when trigger conditions are met and remaining time is below threshold), rather than always transmitting complete delay information. This selective transmission reduces reporting overhead while ensuring that the base station receives sufficient information for resource allocation decisions when delay is critical.
2Reliability
If the terminal apparatus frequently transmits delay status reports, then the base station can make better resource allocation decisions, but the signaling overhead increases
Solution Approach 1:
The patent implements periodic action through threshold-based triggering, where delay status reports are transmitted only when the remaining time falls below a configured threshold. This periodic reporting mechanism ensures that the base station receives timely delay information when it becomes critical, improving resource allocation accuracy while avoiding unnecessary signaling overhead during periods when delay is not an issue.
Solution Approach 2:
The patent changes the reporting behavior based on parameter thresholds (remaining time and signal strength). When the remaining time parameter falls below the configured threshold, the terminal switches from a low-overhead mode to a detailed reporting mode, transmitting both trigger condition and remaining time indicators. This parameter-driven approach optimizes the balance between reliability and signaling overhead.
3Measurement precision
If the terminal apparatus transmits detailed delay information, then the quality of experience in XR applications is improved, but the uplink control channel capacity is consumed
Solution Approach 1:
The patent segments delay information transmission into two parts: a compact trigger condition indicator that fits within standard BSR formats, and an optional remaining time indicator that provides precise delay information only when needed. This segmentation preserves uplink control channel capacity for essential buffer status reporting while enabling high-precision delay information transmission when XR quality of experience requirements demand it.
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 configuring an identifier of a logical channel group (LCG) to which a logical channel (LCH) belongs, and information for indicating a threshold for control of triggering of a delay status report (DSR) for data of the LCG; and a controller (110) configured to control the triggering of the DSR on the basis of that 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.