UE Synchronization Signal Reporting for D2D Relay
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Solution Overview
Problem
In wireless communication systems, especially in Device-to-Device (D2D) operations, terminals outside the base station coverage cannot receive synchronization signals, making reliable synchronization and communication challenging, particularly in public safety networks where reliability and security are critical.
Innovation Solution
A method and apparatus for a user equipment (UE) to evaluate synchronization signal transmission states and report them, allowing the UE to transmit synchronization signals to other terminals, enabling synchronization even when outside the base station coverage, thus facilitating D2D operations and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terminals use base station transmitted synchronization signals for D2D operation, then synchronization accuracy is improved, but reliability deteriorates when terminals are outside base station coverage
Solution Approach 1:
The patent introduces a relay terminal as an intermediary that receives synchronization signals from the base station and re-transmits them to remote terminals. This mediator enables terminals outside base station coverage to achieve synchronization without direct base station connection, resolving the reliability issue while maintaining accuracy through the relay mechanism.
Solution Approach 2:
The synchronization signal transmission path is segmented into multiple hops: base station -> relay terminal -> remote terminal. This segmentation allows the synchronization function to be distributed across multiple nodes, enabling reliable operation in areas outside direct base station coverage while maintaining synchronization accuracy through coordinated relay operations.
2Adaptability or versatility
If terminals perform D2D operation outside base station coverage, then adaptability is improved, but device complexity increases due to synchronization challenges
Solution Approach 1:
The relay terminal autonomously performs synchronization function by receiving signals from the base station and re-transmitting them to remote terminals without requiring complex centralized coordination. This self-service mechanism simplifies the overall system complexity while enabling flexible D2D operation in diverse coverage scenarios.
3Reliability
If terminals transmit synchronization signals for D2D operation, then reliability is improved, but use of energy increases
Solution Approach 1:
The relay terminal transmits synchronization signals periodically rather than continuously, maintaining reliable synchronization while reducing energy consumption. The periodic transmission allows the terminal to conserve battery power by remaining in low-power states between transmissions, while still providing consistent synchronization coverage for D2D operations.
Data Source
AI summary
Provided are a synchronization signal transmission state reporting method performed by a terminal in a wireless communication system and a terminal using the method. The method comprises: evaluating an event related to the synchronization signal transmission state by the terminal; and when the event is satisfied, transmitting a report for the synchronization signal transmission state.