D2D Resource Allocation on TDD Carriers Outside Network Coverage
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Solution Overview
Problem
In Device-to-Device (D2D) communication, there is no existing solution for determining D2D resources to be used on a Time Division Duplexing (TDD) carrier when User Equipments (UEs) operate outside or partially within network coverage.
Innovation Solution
A D2D communication method and apparatus that allows a UE to obtain and allocate TDD uplink and downlink configurations and D2D resource configurations when no cell is detected, enabling D2D communication using an authorized TDD carrier, thereby determining the frame structure and reducing resource competition interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D communication operates on TDD carrier outside network coverage, then D2D communication capability is improved, but resource collision and interference with TDD system may occur
Solution Approach 1:
The patent applies preliminary action by pre-configuring TDD uplink and downlink configurations and D2D resource configuration strategies in the UE before network coverage is lost. When no cell is detected, the UE autonomously allocates D2D resources based on these pre-configured parameters, ensuring continuous D2D communication without resource collisions or interference with the TDD system.
2Object-affected harmful factors
If D2D communication is controlled by LTE network, then interference is reduced, but D2D communication fails when UEs are outside network coverage
Solution Approach 1:
The patent segments the D2D resource allocation process into two modes: network-controlled allocation when UEs are within coverage, and autonomous UE-based allocation when outside coverage. The UE detects cell presence and switches between these segments, maintaining D2D communication availability while preserving network control for interference management when possible.
Solution Approach 2:
The patent enables self-service by allowing UEs to autonomously allocate D2D resources using pre-configured TDD uplink and downlink configurations when no cell is detected. The UE independently determines D2D resource configuration strategies without network assistance, ensuring D2D communication continues outside network coverage while maintaining TDD system compatibility.
3Ease of operation
If D2D resources are allocated without TDD configuration, then resource allocation flexibility is improved, but resource collision probability increases
Solution Approach 1:
The patent applies parameter changes by using pre-configured TDD uplink and downlink configurations to dynamically adjust D2D resource allocation parameters. The UE selects appropriate D2D resource configuration strategies based on the TDD frame structure, ensuring resource allocation flexibility while maintaining reliability by preventing resource collisions through adherence to TDD timing constraints.
Data Source
AI summary
A D2D communication method and a D2D communication apparatus are provided. The method includes: obtaining, by a first UE, a TDD uplink and downlink configuration and a D2D resource configuration strategy for resource configuration in the case that the first UE determines that no cell is detected; allocating, by the first UE, resources for the D2D communication based on the TDD uplink and downlink configuration and the D2D resource configuration strategy; and performing, by the first UE, the D2D communication based on the allocated resources for the D2D communication.