Relay UE Buffer Status Reporting for Public Safety Networks
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Solution Overview
Problem
Current buffer status reporting (BSR) procedures in LTE networks do not support UE-to-Network Relay and UE-to-UE Relay effectively, particularly for ProSe services, which are crucial for public safety networks requiring direct communication and stringent reliability and security standards.
Innovation Solution
A method and apparatus for performing BSR procedures using uplink (UL) or sidelink (SL) BSR, where a relay user equipment (UE) receives data from a remote UE via sidelink, triggers a BSR, and transmits the BSR to the network, enabling efficient UE-to-Network Relay or UE-to-UE Relay by reflecting the buffer status of relayed data and prioritizing it during emergency situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current BSR procedures are used in LTE networks, then existing network operations are maintained, but UE-to-Network Relay and UE-to-UE Relay for ProSe services cannot be supported effectively
Solution Approach 1:
The patent segments the BSR procedure into separate handling mechanisms for different relay types. Specifically, it defines separate procedures for UE-to-Network Relay and UE-to-UE Relay, allowing each to be optimized independently while maintaining overall system reliability and supporting ProSe services effectively.
Solution Approach 2:
The patent introduces a network entity (such as eNodeB) as an intermediary that receives BSR information from relay UEs and forwards it to the appropriate destination. This intermediary mechanism enables reliable relay functionality by ensuring proper routing and processing of buffer status information through the network infrastructure.
2Measurement precision
If relay UE receives data via sidelink and triggers BSR, then accurate buffer status information is provided for relayed data, but additional processing and signaling overhead are introduced
Solution Approach 1:
The patent makes the BSR mechanism universal by enabling relay UEs to use the same BSR procedure for both their own uplink data and relayed data from remote UEs. This multi-functionality approach provides accurate buffer status information for all data types while avoiding the need for separate specialized procedures, thereby reducing overall system complexity.
Solution Approach 2:
The patent merges the BSR handling for relayed data with the existing uplink BSR procedure. By combining these functions, the system achieves accurate buffer status reporting for relayed data without introducing entirely new complex mechanisms, leveraging the existing infrastructure to handle both local and relayed data efficiently.
3Reliability
If relay UE prioritizes BSR for relayed data during emergencies, then public safety requirements are met, but normal data transmission may be affected
Solution Approach 1:
The patent implements dynamic prioritization where the BSR procedure can adapt its behavior based on operational context. During emergency situations, relayed data BSR requests are prioritized to ensure public safety requirements are met. During normal operations, the system can optimize for data transmission efficiency by adjusting priority levels accordingly, allowing flexible adaptation to different operational scenarios.
Data Source
AI summary
A method for performing, by a relay user equipment (UE), a buffer status reporting (BSR) procedure in a wireless communication system is discussed. The method includes receiving data to be relayed from a remote UE via sidelink; trigger a BSR or a sidelink BSR for the data to be relayed; and transmit the BSR or the sidelink BSR to a network.