Sidelink Synchronization Reference Selection via Average RSRP
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Solution Overview
Problem
User Equipment (UE) faces challenges in efficiently measuring and selecting synchronization references for sidelink communication, particularly in scenarios where multiple sidelink synchronization signal blocks (S-SSBs) are received within a single period, requiring effective methods to determine the best synchronization source for reliable communication.
Innovation Solution
A method involving the reception of sidelink synchronization signal blocks (S-SSBs) including a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH), with the UE obtaining an average reference signal received power (RSRP) value to determine whether to select a second device as a synchronization reference, enabling efficient sidelink communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple S-SSBs are received within one period for synchronization reference selection, then synchronization reliability is improved, but measurement complexity increases
Solution Approach 1:
The patent segments the measurement process by introducing a representative S-SSB concept, where instead of measuring all S-SSBs individually, the UE identifies one representative S-SSB per transmitting UE and measures only that one. This segmentation reduces the measurement complexity from O(N) to O(1) per transmitting UE while maintaining synchronization reliability through the representative selection criterion.
Solution Approach 2:
The patent enables the system to self-optimize by allowing UEs to autonomously determine which S-SSB is representative based on predefined criteria (such as highest RSRP or specific time/frequency resources). This self-service mechanism eliminates the need for complex network-controlled measurement coordination while ensuring reliable synchronization reference selection.
2Measurement precision
If average RSRP value is obtained for multiple S-SSBs, then measurement accuracy is improved, but processing time increases
Solution Approach 1:
The patent extracts only the necessary measurement information by obtaining the average RSRP value specifically for the representative S-SSB rather than processing all S-SSBs. This extraction approach maintains measurement accuracy for the selected synchronization reference while significantly reducing processing time by eliminating unnecessary measurements of non-representative S-SSBs.
Data Source
AI summary
Provided are a method for performing, by a first device, wireless communication, and an apparatus for supporting same. The method may comprise the steps of: receiving, from a second device, one or more sidelink synchronization signal blocks (S-SSBs) including a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH); obtaining an average reference signal received power (RSRP) value for at least one S-SSB from among the one or more S-SSBs; and determining, on the basis of the average RSRP value, whether to select the second device as a synchronization reference.