UE D2D Synchronization Signal Detection for Inter-Cell Timing
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Solution Overview
Problem
In D2D communication, aligning transmission and reception timing across cells is challenging, leading to high battery consumption as user equipment apparatuses must try to receive scheduling information and discovery signals in multiple subframes, especially in inter-cell and inter-carrier scenarios.
Innovation Solution
A user equipment apparatus is equipped with a synchronization signal detection unit to detect user equipment-to-user equipment synchronization signals, allowing it to set reception timing based on these signals and receive scheduling information or discovery signals within a defined time window, reducing the need to try reception in all possible subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user equipment apparatuses try to receive scheduling information and discovery signals in all possible subframes to ensure reliable reception in inter-cell D2D communication, then reception reliability is improved, but battery consumption increases significantly
Solution Approach 1:
The invention applies preliminary action by having the user equipment detect the D2D synchronization signal transmitted by another user equipment before attempting to receive scheduling information or discovery signals. This preliminary detection establishes the reception timing in advance, allowing the receiver to know exactly when to listen for signals from other cells, thereby avoiding the need to continuously monitor all possible subframes and significantly reducing battery consumption while maintaining reliable reception.
2Difficulty of detecting and measuring
If user equipment apparatuses monitor all possible subframes for scheduling information and discovery signals from other cells, then signal detection capability is improved, but complexity of reception operation increases
Solution Approach 1:
The invention simplifies reception operation by performing preliminary detection of the D2D synchronization signal to establish reception timing before attempting to receive scheduling information or discovery signals. This preliminary step provides the receiver with precise timing information, reducing the complexity of monitoring all possible subframes while maintaining comprehensive signal detection capability from other cells.
Data Source
AI summary
A user equipment apparatus for performing user equipment-to-user equipment communication includes a synchronization signal detection unit configured to detect a user equipment-to-user equipment synchronization signal transmitted from a user equipment apparatus in another cell or another carrier; a control unit configured to set reception timing based on the user equipment-to-user equipment synchronization signal; and a reception unit configured to receive scheduling information or a discovery signal transmitted from the user equipment apparatus in the other cell or the other carrier within a time window defined based on the user equipment-to-user equipment synchronization signal.