Sidelink Synchronization Signaling Across Aggregated Carriers
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Solution Overview
Problem
In sidelink (SL) communication with carrier aggregation (SL CA), there are issues with synchronization coverage imbalance and the inability to perform communication on non-synchronization carriers, limiting the expansion of the SL communication range.
Innovation Solution
A node performs measurements on multiple frequencies within a frequency subset to determine whether to transmit a sidelink synchronization signal block, optimizing the transmission mechanism based on a plurality of measurement results, including thresholds, to ensure synchronization on frequencies with weak coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a terminal device determines based on a measurement result on a synchronization carrier whether to transmit a sidelink synchronization signal on an aggregated carrier, then the synchronization process is simplified, but synchronization coverage becomes imbalanced and communication cannot be performed on non-synchronization carriers
Solution Approach 1:
The patent segments the frequency set into a synchronization carrier and multiple non-synchronization carriers. The terminal device independently determines whether to transmit sidelink synchronization signals on each carrier type based on separate measurement results, allowing differentiated synchronization strategies for different carrier types while maintaining overall system synchronization.
Solution Approach 2:
The patent extends the synchronization decision-making process from a single carrier dimension to multiple carrier dimensions. By performing measurements and making transmission decisions on both synchronization carriers and non-synchronization carriers independently, the system achieves multi-dimensional synchronization coverage expansion.
2Productivity
If sidelink carrier aggregation is supported to increase data transmission rate, then communication capacity is improved, but synchronization coverage imbalance and inability to communicate on non-synchronization carriers occurs
Solution Approach 1:
The patent enables the sidelink synchronization signal transmission mechanism to serve multiple functions simultaneously: maintaining synchronization on the synchronization carrier and expanding synchronization coverage to non-synchronization carriers. This multi-functional approach allows carrier aggregation to increase data transmission rate while simultaneously improving synchronization coverage across all carriers.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal device measures signal quality on both synchronization and non-synchronization carriers, uses these measurement results to determine transmission decisions, and transmits synchronization signals accordingly. This closed-loop feedback ensures that synchronization coverage is continuously optimized across all aggregated carriers.
Data Source
AI summary
The present application provides a method and an apparatus for wireless communication. An example method includes: respectively performing measurements on all frequencies in a first frequency subset to obtain a plurality of measurement results, determining whether to transmit a sidelink synchronization signal block on one or more frequencies in a first frequency set based on a first parameter and a first threshold, wherein the first parameter is determined based on the plurality of measurement results, and the first frequency subset belongs to the first frequency set.