Uplink Resource Request Signaling for Low-Latency XR Scheduling
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Solution Overview
Problem
Existing wireless communication systems face challenges in reducing scheduling delay and achieving accurate buffer size reporting for XR services, particularly in the context of 5G NR, due to issues with the SR-BSR-PUSCH procedure and coarse granularity of BSR reporting, which leads to inefficient resource allocation and increased latency.
Innovation Solution
The proposed solution involves enhancing the SR mechanism to include buffer size information or traffic type indication, configuring multiple-bit SRs, and designing XR-specific BSR tables to achieve accurate granularity of buffer size reporting, allowing for direct PUSCH transmission after SR without waiting for a BSR report, and optimizing multiplexing rules for SR and UCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the SR-BSR-PUSCH procedure is used for uplink resource allocation, then resource allocation can be performed, but scheduling delay increases due to the sequential nature of SR followed by BSR reporting
Solution Approach 1:
The patent combines the Scheduling Request (SR) and Buffer Status Report (BSR) into a single uplink transmission. The UE includes both SR indication and BSR information in the same PUCCH or PUSCH transmission, eliminating the sequential delay between SR and BSR reporting while maintaining proper resource allocation procedures.
Solution Approach 2:
The patent enables the UE to prepare and transmit BSR information together with the SR in advance, rather than waiting for separate BSR reporting opportunities. This preliminary inclusion of buffer status information with the scheduling request accelerates the overall resource allocation process.
2Measurement precision
If traditional BSR reporting is used, then buffer status can be reported, but granularity is coarse leading to inefficient resource allocation
Solution Approach 1:
The patent introduces new BSR table configurations with finer granularity for XR services. Multiple BSR tables can be configured with different buffer size ranges and resolutions, allowing the system to select appropriate granularity levels based on service requirements. This enables more precise buffer status reporting compared to traditional single-table BSR mechanisms.
Solution Approach 2:
The patent segments the buffer status reporting into service-specific categories, particularly for XR services. Different BSR tables and reporting mechanisms are applied to different service types (eMBB, URLLC, mMTC, XR), allowing optimized granularity for each service class rather than using a unified coarse-grained approach.
3Measurement precision
If multiple BSR tables are configured for different services, then accurate buffer reporting can be achieved, but system complexity increases
Solution Approach 1:
The patent implements dynamic selection among multiple configured BSR tables based on service type and traffic characteristics. The network can activate specific BSR tables for different services (eMBB, URLLC, mMTC, XR) and the UE dynamically selects the appropriate table based on the active service, managing complexity through conditional activation rather than simultaneous maintenance of all tables.
Solution Approach 2:
The patent applies different BSR table configurations and granularities to different service types and logical channel groups. Each service class receives tailored BSR reporting parameters appropriate to its requirements, rather than applying a uniform configuration across all services. This localized optimization reduces overall system complexity by allowing selective complexity where needed.
Data Source
AI summary
A wireless communication method and related devices are provided. The method, performed by a user equipment (UE), including transmitting a signaling for requesting uplink resources, wherein the signaling carries information for indicating buffer size information or traffic type or Buffer Status Report (BSR) table type information or resource requesting information; and transmitting data on the requested uplink resources scheduled based on the indicated buffer size information or traffic type or BSR table type information. With this method, data can be transmitted right after SR, thereby reducing scheduling delay.