XR Buffer Status Reporting for Deadline-Aware 5G Scheduling
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Solution Overview
Problem
Conventional 5G NR systems lack the ability to differentiate the urgency of data packets in XR applications, leading to inefficient resource allocation due to the lack of information about remaining time to delivery deadlines, resulting in suboptimal scheduling for high data throughput, high reliability, and low latency requirements.
Innovation Solution
The UE reports data packets associated with logical channel groups (LCGs) using a new buffer status report (XR-BSR) that includes data volumes and remaining times to delivery deadlines, allowing the gNB to schedule transmissions more efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional BSR procedures are used to report buffer status, then the gNB can schedule UL radio resources, but the system cannot differentiate the urgency of data packets resulting in inefficient resource allocation
Solution Approach 1:
The patent segments the buffer status report by dividing data packets into urgent and non-urgent sets based on remaining time to delivery deadline. The BSR MAC CE includes separate buffer size fields (first buffer size field for urgent packets, second buffer size field for non-urgent packets) allowing the gNB to differentiate and prioritize urgent data transmission, thus resolving the information loss while maintaining scheduling capability
Solution Approach 2:
The patent adds a time dimension to the traditional buffer status reporting by including remaining time information to delivery deadlines. This enables the gNB to not only know how much data is buffered but also the urgency level, transforming the scheduling decision from purely volume-based to time-aware prioritization
2Productivity
If the UE reports detailed buffer status information including remaining time to delivery deadlines, then scheduling efficiency improves, but the complexity of the reporting mechanism increases
Solution Approach 1:
The patent changes the parameter structure of the BSR MAC CE by introducing new fields (first buffer size field, second buffer size field, and remaining time indicators) while maintaining compatibility with existing MAC CE frameworks. This allows detailed reporting without fundamentally redesigning the entire reporting mechanism, thus improving scheduling efficiency while controlling complexity through incremental parameter expansion
Solution Approach 2:
The patent implements dynamic classification of data packets into urgent and non-urgent sets based on real-time remaining time to delivery deadline comparisons. The UE dynamically determines which buffer size field to populate based on current time conditions, allowing flexible adaptation to varying traffic conditions without requiring static complex reporting structures
3Speed
If the UE classifies and reports only urgent data packets, then the gNB can prioritize transmission, but information about non-urgent packets is lost
Solution Approach 1:
The patent merges the reporting of urgent and non-urgent packet status into a single BSR MAC CE structure. Both buffer size fields coexist in the same MAC CE, allowing the gNB to receive comprehensive information about both urgent and non-urgent traffic in one report, enabling priority scheduling without losing information about lower-priority packets
Data Source
AI summary
According to embodiments, a user equipment (UE) sends, to a base station, a status report about data packets stored in a buffer of the UE. The data packets are associated with a logical channel group (LCG). The data packets include a first set of data packets and a second set of data packets. The status report indicates at least a first total size of the first set. The UE receives, from the base station, scheduling information. The UE transmits, to the base station, at least the first set stored in the buffer in accordance with the scheduling information.