D2D Signal Detection Window for Remote UE Power Reduction
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Solution Overview
Problem
In device-to-device (D2D) communication, remote user equipment (UE) experiences high power consumption due to continuous detection of sidelink synchronization signals (SLSS) when out of network coverage, which is inefficient and drains battery life.
Innovation Solution
Implementing a method where the first synchronization signal is sent based on a pre-configured or network-provided timing reference, allowing for the detection of a discovery signal that determines a specific time window for detecting the second synchronization signal, reducing unnecessary power consumption by limiting detection to only within this window.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the remote UE continuously detects SLSS to maintain synchronization, then the synchronization accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent implements periodic detection of synchronization signals by defining specific detection time windows instead of continuous detection. The UE detects SLSS only during predetermined time intervals, which maintains synchronization capability while significantly reducing power consumption during idle periods.
Solution Approach 2:
The patent uses discovery signals to provide preliminary information about synchronization signal locations and timing before the actual SLSS detection occurs. This preliminary action allows the UE to prepare for detection only when necessary, avoiding continuous monitoring and reducing overall power consumption.
2Adaptability or versatility
If the remote UE sends SLSS periodically to enable other UEs to obtain timing, then the synchronization availability is improved, but the power consumption increases
Solution Approach 1:
The patent implements periodic transmission of synchronization signals by the remote UE at predetermined intervals rather than continuous transmission. This maintains the ability of other UEs to obtain timing information while significantly reducing the power consumption associated with continuous signal generation and transmission.
3Reliability
If the detection time window is extended to ensure complete signal capture, then the detection reliability is improved, but the power consumption increases
Solution Approach 1:
The patent optimizes the detection time window parameters (duration, timing, frequency) to achieve the minimum necessary detection period that still ensures reliable signal capture. By carefully adjusting these parameters, the system maintains detection reliability while minimizing the time the receiver needs to be active, thus reducing power consumption.
Data Source
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AI summary
Disclosed are a signal detection method and apparatus, a signal sending method and apparatus, and a remote user equipment. The signal detection method includes: a first synchronization signal is sent based on a first timing reference; a first discovery signal is detected based on the first timing reference, where the first discovery signal carries synchronization information; after the first discovery signal is detected, a second synchronization signal is detected within a first time window corresponding to the synchronization information.