Multipath Sidelink Relay SR/BSR Triggering for Duplicated Channels
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Solution Overview
Problem
In Dual Connectivity (DC) scenarios, existing technologies face challenges in efficiently managing scheduling request (SR) and buffer status report (BSR) reporting for wireless transmit/receive units (WTRUs) served by multiple nodes, particularly in multipath sidelink relays with resource allocation modes 1 and 2, leading to inefficiencies in data transmission.
Innovation Solution
A relay WTRU receives information from remote WTRUs about sidelink logical channels and resource allocation modes, triggers BSR/SR based on specific conditions, determines parameters for transmission, and cancels BSR/SR based on remote WTRU indications, adapting to changes in duplication behavior and coverage status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SR/BSR reporting is triggered for all SL LCHs in multipath sidelink relays, then data transmission coverage is comprehensive, but reporting overhead and signaling complexity increase
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different SL LCHs based on their duplication status. For SL LCHs associated with duplicated data, SR/BSR reporting is suppressed; for SL LCHs not associated with duplicated data, SR/BSR reporting is triggered. This selective approach reduces overall reporting overhead while maintaining comprehensive data transmission coverage for necessary channels.
2Device complexity
If SR/BSR reporting is suppressed for SL LCHs with duplicated data, then reporting overhead is reduced, but resource allocation accuracy may be compromised
Solution Approach 1:
The patent implements feedback mechanisms where the relay WTRU receives information from remote WTRUs about duplication status and resource allocation mode. The relay WTRU also receives adaption layer configuration information from the network that maps SL LCHs to Uu LCHs. This feedback loop enables the relay to accurately determine which SL LCHs should trigger SR/BSR reporting, ensuring resource allocation accuracy is maintained even with suppressed reporting for duplicated data channels.
3Speed
If the relay WTRU continuously monitors all SL LCHs for data arrival, then data transmission responsiveness is improved, but processing complexity and energy consumption increase
Solution Approach 1:
The patent extracts the SR/BSR triggering function from continuous monitoring of all SL LCHs. Instead of monitoring everything, the relay WTRU uses received information about duplication status and resource allocation mode to determine only the subset of SL LCHs that require monitoring and reporting. This extraction approach maintains responsiveness for critical channels while reducing processing complexity for channels with duplicated data.
Data Source
AI summary
A relay wireless transmit/receive unit (WTRU) may receive information from at least one remote WTRU and may comprise an indication of a set of sidelink (SL) logical channels (LCHs) that are associated with duplicated data and an indication of a resource allocation mode of the at least one remote WTRU. The relay WTRU may receive information from a network that may comprise an indication of an association of SL LCHs to Uu LCHs. The relay WTRU may trigger a BSR (or SR) when SL LCH data associated with a Uu LCH of the relay WTRU arrives from at least one remote WTRU that has a resource allocation mode of mode 2 and on a condition that at least one SL LCH from the at least one remote WTRU that has a resource allocation mode of mode 2 is not associated with duplicated data.