NR V2X Multi-Source Synchronization for Sidelink Communication
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Solution Overview
Problem
In sidelink communication, UEs may face challenges in establishing communication due to differences in synchronization timings and synchronization sources, leading to communication failures between UEs, especially when in-coverage and out-of-coverage UEs have different synchronization selection rules and recognized neighboring synchronization sources.
Innovation Solution
A method and device for selecting a first synchronization source based on sidelink synchronization priority, receiving multiple synchronization signals, and choosing a second synchronization source based on a time gap threshold, allowing efficient transmission of sidelink-synchronization signal blocks to ensure consistent communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a UE selects synchronization sources based on pre-configured priority rules, then the synchronization selection process is simple and deterministic, but communication failures occur when in-coverage and out-of-coverage UEs have different synchronization timings
Solution Approach 1:
The patent applies dynamics by enabling UEs to dynamically select from multiple synchronization sources rather than being fixed to a single pre-configured source. The UE can switch between different synchronization sources (e.g., gNB, eNB, GNSS, other UEs) based on current network conditions and coverage status, allowing flexible adaptation to different communication scenarios and resolving the contradiction between simple deterministic selection and reliable communication establishment.
2Adaptability or versatility
If UEs use different synchronization timings according to their coverage status, then each UE can optimize its synchronization for its specific scenario, but sidelink communication becomes impossible between UEs with different synchronization sources
Solution Approach 1:
The patent applies universality by enabling a single UE to simultaneously maintain multiple synchronization timings from different sources (in-coverage and out-of-coverage synchronization sources). This allows the UE to universally communicate with both in-coverage UEs using gNB/eNB synchronization and out-of-coverage UEs using GNSS or other UE synchronization, thereby achieving both optimization for specific scenarios and reliable communication across different scenarios.
Solution Approach 2:
The patent introduces a new dimension to synchronization selection by allowing UEs to maintain multiple synchronization sources simultaneously rather than selecting a single dimension. The UE can store and switch between different synchronization timings (first synchronization timing from in-coverage source, second synchronization timing from out-of-coverage source), adding a multi-dimensional approach to synchronization that enables communication with UEs having different synchronization sources.
3Reliability
If a UE maintains multiple synchronization sources, then communication with UEs having different synchronization timings becomes possible, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the synchronization management function into distinct components: a first synchronization source (e.g., gNB/eNB for in-coverage UEs) and a second synchronization source (e.g., GNSS or other UEs for out-of-coverage UEs). The UE separately manages each synchronization source with its own timing information, allowing organized and scalable handling of multiple synchronization sources without overwhelming complexity.
Data Source
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AI summary
A method by which a first apparatus performs wireless communication is proposed. The method may comprise the steps of selecting a first synchronization source, on the basis of a sidelink synchronization priority; obtaining a first synchronization, on the basis of the first synchronization source; receiving a plurality of synchronization signals from a plurality of synchronization sources; obtaining a plurality of synchronizations, on the basis of the plurality of synchronization signals; selecting a second synchronization source from among the plurality of synchronization sources, on the basis of a gap between a time related to the first synchronization and a time related to a second synchronization being greater than or equal to a threshold value, wherein the second synchronization is obtained on the basis of the second synchronization source; and transmitting, to a second apparatus, a sidelink-synchronization signal block (S-SSB), on the basis of the first synchronization or the second synchronization. For example, the first synchronization source and the second synchronization source may comprise at least one of a global navigation satellite system (GNSS), a base station, or user equipment. For example, the S-SSB may comprise a sidelink primary synchronization signal (S-PSS), a sidelink secondary synchronization signal (S-SSS), and a physical sidelink broadcast channel (PSBCH).