Sidelink Synchronization Signal Configuration via Beam Measurement
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Solution Overview
Problem
Wireless communication systems face challenges in providing satisfactory resource allocation and system synchronization via sidelink communications, particularly in direct communication scenarios such as device-to-device (D2D) and vehicle-to-everything (V2X) networks, where existing techniques may not ensure reliable synchronization signals due to increased signal attenuation and interference.
Innovation Solution
The described techniques involve user equipment (UE) generating a signal metric by measuring a set of beams to identify a sidelink configuration for synchronization signal transmission within a sidelink channel, allowing for improved synchronization signal transmission and reception, even when the UE is out of coverage, by selecting appropriate resource pools and synchronization signal identifiers based on the signal metric.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink communications are used for direct device-to-device communication, then communication efficiency and resource allocation are improved, but signal attenuation and interference increase, leading to unreliable synchronization signals
Solution Approach 1:
The patent introduces a synchronization signal that can be transmitted via sidelink channel as an intermediary mechanism. When the UE is out of coverage, this synchronization signal acts as a mediator to enable other UEs to synchronize their communications, thereby maintaining reliability in direct communications without network coverage
Solution Approach 2:
The patent changes the transmission parameters by selecting synchronization signal identifiers from different sets (in-coverage set or out-of-coverage set) based on the signal metric. This parameter change allows the system to adapt to different coverage conditions and maintain synchronization reliability
2Reliability
If beam measurements are performed to determine synchronization configuration, then signal quality and coverage area are improved, but device complexity and measurement overhead increase
Solution Approach 1:
The patent segments the synchronization signal identification into different sets (in-coverage set and out-of-coverage set). This segmentation simplifies the measurement process by allowing the UE to select from predefined sets based on coverage status, reducing the complexity of real-time configuration decisions
Solution Approach 2:
The UE autonomously determines its coverage status and selects the appropriate synchronization signal identifier set without requiring network assistance. This self-service mechanism reduces signaling overhead and simplifies the system complexity while maintaining signal quality
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for indicating a sidelink configuration for synchronization signal transmission. For example, a user equipment (UE) may establish an access link with a base station or transmission/reception point. The UE may measure a plurality of beams of the access link or of a sidelink channel to generate a signal metric of the access link or of the sidelink channel. Based on the generated signal metric, the UE may identify a sidelink configuration for synchronization signal transmission within the sidelink channel. In some cases, the UE may transmit a synchronization signal via the sidelink channel based at least in part on the sidelink configuration.