Multi-TRP Sidelink Synchronization Signal Relay Decisions
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Solution Overview
Problem
In wireless communications systems with multi-TRP user equipment (UEs), determining whether to relay sidelink synchronization signals (SLSSs) is complicated by varying signal strengths across different TRPs, leading to inefficiencies in network synchronization and communication efficiency.
Innovation Solution
A first UE performs measurements on SLSSs received at multiple TRPs and applies single or multiple thresholds to determine whether to relay the signals via both or specific TRPs, initiating timers based on threshold comparisons to optimize signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE relays SLSSs based on measurements from multiple TRPs, then network synchronization reliability is improved, but device complexity increases due to multiple measurement and threshold comparison processes
Solution Approach 1:
The patent segments the SLSS relay decision process by applying different threshold comparison methods: single threshold comparison for simple cases and multiple threshold comparison for complex multi-TRP scenarios. This segmentation allows the system to adapt complexity to actual needs, improving reliability when necessary while avoiding unnecessary complexity when not needed.
Solution Approach 2:
The patent implements dynamic threshold comparison where the number of thresholds (one or multiple) is selected based on the specific measurement scenario and TRP configuration. The system dynamically adjusts the decision-making process complexity to match the operational requirements, balancing reliability improvement with device complexity management.
2Measurement precision
If multiple thresholds are applied for SLSS relay decisions, then synchronization precision is improved, but processing time increases due to additional timer operations
Solution Approach 1:
The patent applies preliminary action by pre-configuring threshold values and timer parameters before actual SLSS measurements are performed. This allows the system to have synchronization precision requirements pre-established, enabling faster real-time decision-making during actual operation without calculating thresholds on-the-fly.
Solution Approach 2:
The patent implements skipping mechanisms where timers can be deactivated or bypassed under certain conditions. When measurements consistently satisfy threshold requirements, the system can skip waiting for timer expiration, reducing processing time while maintaining synchronization precision through continuous monitoring capabilities.
3Reliability
If SLSS measurements are performed at both TRPs, then transmission reliability is improved, but energy consumption increases due to dual-reception processing
Solution Approach 1:
The patent applies local quality by enabling measurements at specific TRPs based on local conditions and requirements. Instead of universally requiring measurements at both TRPs, the system selectively performs measurements only where necessary to achieve the required transmission reliability, thereby reducing overall energy consumption while maintaining reliability where critical.
Solution Approach 2:
The patent implements partial action by performing measurements at only one TRP when sufficient for the application, or at both TRPs when higher reliability is needed. This partial or selective measurement approach avoids the constant energy expenditure of dual-TRP measurements while ensuring reliability is achieved when necessary through conditional measurement strategies.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may receive, from a second UE, a first sidelink synchronization signal (SLSS) at a first transmission-reception point (TRP) and a second TRP different from the first TRP. The first UE may perform a first set of measurements on the first SLSS received at the first TRP and a second set of measurements on the first SLSS received at the second TRP. The first UE may then transmit, to a third UE, a second SLSS based at least in part on the first set of measurements, the second set of measurements, or both, satisfying one or more measurement thresholds.