Joint Buffer Status Report for Sidelink and Uu Link
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing buffer status reporting across sidelink and Uu link channels, leading to increased complexity and resource overhead, especially when relay operations are involved.
Innovation Solution
A method and apparatus for wireless communication that configures and generates a joint buffer status report (BSR) for both sidelink and Uu link channels, allowing for unified reporting using a single medium access control control element (MAC-CE), with configurations provided via radio resource control (RRC) signaling, enabling efficient buffer reporting by specifying logical channel indices or groups for sidelink operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate buffer status reports are generated for sidelink and Uu link channels, then buffer status information for each link can be reported independently, but overhead and complexity increase due to multiple reporting mechanisms
Solution Approach 1:
The patent combines separate buffer status reports for sidelink and Uu link into a single joint BSR message. The MAC CE structure integrates buffer status information from both links, allowing the UE to report sidelink buffer status (for direct communication with other UEs) and Uu link buffer status (for communication with base station) simultaneously in one unified report, thereby reducing overhead and complexity while maintaining independent reporting capability for each link type.
2Device complexity
If unified joint buffer status reporting is implemented for sidelink and Uu link, then overhead and complexity are reduced, but differentiation between link-specific buffer information may be lost
Solution Approach 1:
The joint BSR MAC CE is segmented into distinct fields for sidelink buffer status and Uu link buffer status. Each segment contains specific buffer status information for its respective link type, with appropriate logical channel group identifiers and buffer size indicators. This segmentation ensures that while the report is unified, the link-specific information remains clearly differentiated and separately processable by the base station.
3Loss of information
If multiple separate BSR messages are transmitted for different links, then complete buffer status information is provided, but resource overhead and transmission time increase
Solution Approach 1:
The patent merges multiple separate BSR messages into a single joint BSR transmission. The MAC CE structure accommodates buffer status information for both sidelink and Uu link within one message frame, eliminating the need for separate message transmissions. This reduces uplink resource overhead and minimizes transmission time while preserving complete buffer status information for both link types through structured field organization.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may receive a configuration for buffer status reporting associated with a sidelink between the first UE and a second UE and a link between the first UE and a base station; generate a buffer status report (BSR) based at least in part on the configuration, wherein the BSR includes buffer reporting information for one or more logical channels on the sidelink between the first UE and the second UE, and buffer reporting information for one or more logical channels on the link between the first UE and the base station; and provide the BSR to the base station. Numerous other aspects are provided.