Dynamic Synchronization Source Switching for D2D Communication
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently acquiring synchronization for device-to-device (D2D) communication, particularly when devices are outside the coverage of a base station, leading to increased latency and reduced synchronization performance.
Innovation Solution
A method and device for receiving a synchronization signal in a wireless communication system, where user equipment (UE) can switch between two synchronization modes: using a base station (first type device) for synchronization when within coverage, and an external synchronization source (second type device) like GPS for synchronization when outside coverage, allowing for more rapid and accurate D2D synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If device-to-device communication uses base station for synchronization, then synchronization reliability is maintained, but latency increases and synchronization performance degrades when outside base station coverage
Solution Approach 1:
The patent implements dynamic switching between two synchronization modes: network-based synchronization (when available) and autonomous synchronization (when outside coverage). The UE determines the appropriate mode based on its location relative to the base station, allowing flexible adaptation to different operational conditions. This dynamic approach resolves the contradiction by selecting the optimal synchronization method based on real-time availability and performance requirements.
Solution Approach 2:
The patent changes the synchronization parameter state by introducing a synchronization mode indicator that can take different values (first synchronization mode using base station, second synchronization mode using autonomous synchronization). This parameter change enables the system to switch between different synchronization mechanisms, allowing the UE to maintain low latency through autonomous synchronization when outside coverage while relying on base station synchronization when available.
2Loss of time
If device-to-device communication uses autonomous synchronization outside coverage, then latency is reduced, but synchronization accuracy may deteriorate
Solution Approach 1:
The patent incorporates feedback mechanisms where the UE reports its synchronization mode and status to the base station. The base station provides feedback information about network conditions and synchronization status. This feedback loop enables the system to monitor synchronization quality and switch between modes if accuracy deteriorates, ensuring that low-latency autonomous synchronization is used only when accuracy requirements can be met.
Solution Approach 2:
The patent performs preliminary actions by having the UE configure and prepare autonomous synchronization parameters in advance. The UE pre-configures timing information and synchronization parameters before entering out-of-coverage areas, enabling rapid switching to autonomous mode without delay. This preliminary preparation allows the system to achieve low latency while maintaining accuracy through pre-established synchronization protocols.
3Adaptability or versatility
If the system supports multiple synchronization modes, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent segments the synchronization function into distinct modes: first synchronization mode (network-based) and second synchronization mode (autonomous). Each mode has clearly defined parameters, procedures, and switching conditions. This segmentation simplifies the overall complexity by organizing the multiple synchronization capabilities into manageable, discrete components with clear separation of responsibilities, making the UE implementation more straightforward despite supporting multiple modes.
Data Source
AI summary
A method of performing device-to-device (D2D) communication by a user equipment (UE) in a wireless communication system includes receiving information on a synchronization type for the D2D communication; based on the information on the synchronization type, selecting a synchronization source for the D2D communication; and transmitting information on the synchronization source used by the UE. Further, based on the synchronization type being a first synchronization type, the UE uses a cell of a network as the synchronization source and based on the synchronization type being a second synchronization type, the UE uses an external synchronization source as the synchronization source.