Inter-Cell D2D Synchronization via Neighbor Base Station Signals
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Solution Overview
Problem
Current wireless communication systems face challenges in managing device-to-device (D2D) communication across cells in asynchronous networks, particularly in synchronizing and configuring resource pools for inter-cell D2D discovery and communication, which affects the coexistence with wide-area networks.
Innovation Solution
The method involves detecting D2D synchronization signals, determining UE receive resource pools, and monitoring D2D discovery or communication signals, with specific configurations for Scheduling Assignment and data pools, allowing for inter-cell D2D communication and discovery by synchronizing with neighboring base stations and transmitting resource pools to devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication is implemented across cells in asynchronous networks, then device-to-device discovery and communication capability is improved, but synchronization complexity and resource pool configuration difficulty increase
Solution Approach 1:
The patent introduces D2D synchronization signals as an intermediary mechanism that enables UEs to synchronize with neighboring cells through intermediate synchronization references. Instead of direct complex synchronization between all devices, the system uses standardized synchronization signals transmitted by neighboring base stations as mediators, simplifying the synchronization process while enabling inter-cell D2D communication.
Solution Approach 2:
The patent segments the resource pool configuration into distinct components including D2D discovery resource pools, D2D communication resource pools, and synchronization signal resources. This segmentation allows independent configuration and management of each resource type, reducing overall system complexity while enabling versatile D2D operations across multiple cells.
2Adaptability or versatility
If resource pools are configured for inter-cell D2D discovery and communication, then D2D service functionality is improved, but resource management complexity and interference with wide-area networks increase
Solution Approach 1:
The patent divides radio resources into segmented resource pools: D2D discovery resource pools for device discovery, D2D communication resource pools for data transmission, and wide-area network resources for cellular communication. Each pool is independently configured with specific time-frequency resources, enabling efficient resource management and reducing interference between D2D and wide-area network operations.
Solution Approach 2:
The patent implements periodic resource pool configurations where D2D discovery and communication resources are allocated in periodic intervals rather than continuously. This periodic structure simplifies resource management by creating predictable patterns that can be easily scheduled and monitored, while still providing continuous D2D service functionality through repeated resource availability.
3Reliability
If synchronization with neighboring base stations is implemented, then inter-cell D2D communication reliability is improved, but detection and measurement difficulty increase
Solution Approach 1:
The patent employs distinct D2D synchronization signal sequences that are uniquely associated with different base stations, analogous to color changes for identification. Each neighboring base station transmits synchronization signals with distinctive characteristics (different sequences, frequencies, or time patterns), enabling UEs to easily detect and identify specific base stations for synchronization purposes, thereby improving reliability while reducing detection difficulty.
Data Source
AI summary
A method includes detecting a device to device (D2D) synchronization signal of a neighbor base station, transmitted from at least one other UE associated with the neighbor base station through a transceiver, determining at least one UE receive (RX) resource pool configured by the neighbor base station based on the D2D synchronization signal of the neighbor base station, and monitoring a D2D discovery or communication signal transmitted from the at least one other UE according to the at least one UE RX resource pool through the transceiver. A method includes determining at least one UE RX resource pool for at least one device associated with a base station, each UE RX resource pool comprising a repetition of a Scheduling Assignment (SA) pool and a data pool with a scheduling cycle, the SA pool comprising a SA bitmap, and the data pool comprising at least one repeated data bitmap.