Sidelink Synchronization Reference Cell Selection
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Solution Overview
Problem
In wireless communication systems, particularly in LTE, there is a need to improve synchronization acquisition methods to ensure reliable sidelink communication, especially when channel quality is variable, and to reduce costs and power consumption while maintaining service availability and flexibility in frequency band use.
Innovation Solution
A method where user equipment (UE) in a wireless communication system receives a sidelink resource configuration from a second cell and selects a synchronization reference cell based on channel quality, either the second cell or a neighboring cell, to transmit sidelink data using the acquired synchronization signal from the first cell, optimizing channel quality thresholds for selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a UE uses the serving cell for synchronization in sidelink communication, then the synchronization acquisition is simple, but the channel quality may be poor leading to unreliable communication
Solution Approach 1:
The patent implements dynamic synchronization reference cell selection where the UE autonomously determines whether to use the serving cell or a neighboring cell as the synchronization reference based on real-time channel quality measurements. This dynamic adaptation allows the system to switch between synchronization sources depending on current network conditions, resolving the contradiction between operational simplicity and communication reliability.
2Reliability
If the UE measures and selects synchronization reference based on channel quality, then the communication reliability is improved, but the UE complexity increases
Solution Approach 1:
The patent enables the UE to autonomously perform channel quality measurement and synchronization reference cell selection without requiring network intervention. The UE self-determines the optimal synchronization source based on its own measurements, which simplifies the overall system architecture while maintaining high reliability, thus resolving the contradiction between reliability improvement and UE complexity.
3Device complexity
If the UE always uses the serving cell for synchronization, then the device complexity is low, but the power consumption increases due to continuous monitoring
Solution Approach 1:
The patent implements periodic channel quality measurement rather than continuous monitoring. The UE measures channel quality at specific intervals or when certain conditions are met, then uses these measurements to determine the synchronization reference cell. This periodic approach reduces power consumption significantly while maintaining the ability to adapt to changing network conditions, resolving the contradiction between low complexity and reduced power consumption.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method for acquiring, by a first user equipment (UE) in a coverage of a first cell, synchronization in a wireless communication system, the method comprising: receiving a message for a sidelink resource configuration from a second cell through the second UE in a coverage of the second cell; if a channel quality of the second cell is less than a predetermined threshold, selecting the first cell as a synchronization reference cell; and transmitting a sidelink data to the second UE using the sidelink resource configuration based on the synchronization acquired from a synchronization signal of the first cell.