D2D Terminal Synchronization in Partial Coverage Scenarios
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Solution Overview
Problem
Current D2D synchronization methods in 3GPP Rel-12 are insufficient for meeting user needs, particularly in partial coverage and out-of-coverage scenarios, and lack backward compatibility for legacy terminals.
Innovation Solution
A method and apparatus for synchronizing D2D terminals in time and frequency, involving obtaining synchronization resource configurations and sending D2D synchronization signals and physical sidelink broadcast channels based on specific conditions to ensure synchronization between in-coverage and out-of-coverage UE's, while avoiding interference with legacy terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If D2D synchronization resources are shared between discovery UEs and communication UEs, then resource utilization is improved, but synchronization precision deteriorates due to signal stacking and interference
Solution Approach 1:
The patent segments the synchronization resource pool into dedicated resources for discovery UEs and dedicated resources for communication UEs. This segmentation prevents signal stacking and interference between the two types of UEs, thereby maintaining synchronization precision while still providing sufficient resources for both functions.
Solution Approach 2:
The patent extracts the synchronization resource allocation for discovery UEs and communication UEs from a shared pool and assigns them separate dedicated resources. This extraction eliminates the harmful interference caused by signal stacking while preserving the overall resource utilization efficiency.
2Adaptability or versatility
If new synchronization methods are introduced for partial and out-of-coverage scenarios, then synchronization capability is improved, but device complexity increases
Solution Approach 1:
The patent introduces a universal synchronization resource configuration mechanism that can be applied across different coverage scenarios (in-coverage, partial-coverage, and out-of-coverage). The same resource pool and configuration methods serve multiple purposes and scenarios, enhancing adaptability without significantly increasing terminal complexity.
Solution Approach 2:
The patent implements dynamic synchronization resource allocation where the eNB can flexibly configure and adjust synchronization resources based on the specific coverage scenario and network conditions. This dynamic approach allows the system to adapt to different scenarios efficiently while keeping terminal complexity manageable through standardized procedures.
3Reliability
If synchronization resources are configured by eNB for in-coverage UEs, then synchronization control is improved, but loss of time increases due to configuration signaling overhead
Solution Approach 1:
The patent employs preliminary configuration of synchronization resource pools by the eNB, where resource pool parameters are pre-defined and configured in advance. This preliminary action reduces the need for frequent reconfiguration signaling, thereby minimizing time loss while maintaining reliable eNB-controlled synchronization.
Solution Approach 2:
The patent utilizes parameter-based configuration where the eNB configures synchronization resources by changing and transmitting specific parameter sets rather than detailed resource allocations. This parameter change approach reduces signaling overhead and configuration time while maintaining effective eNB control over synchronization.
Data Source
AI summary
The present disclosure relates to a sensor network, machine type communication (MTC), machine-to-machine (M2M) communication, and technology for interne of things (IoT). The present disclosure may be applied to intelligent services based on the above technologies, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure provides a method of synchronizing device to device (D2D) terminals. Under partial coverage (PC) scenarios, an in coverage user equipment (ICUE) may send a D2D synchronization signal (D2DSS) and a physical sidelink broadcast channel (PSBCH) on synchronization resources of a cell to implement mutual discovery of an ICUE and an out of coverage user equipment (OCUE) when a condition for triggering the D2DSS is satisfied.