D2D Radio Resource Handling During Wireless Handover
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Solution Overview
Problem
Current wireless communication systems, particularly LTE, lack efficient methods for handling radio resources during device-to-device (D2D) operations when user equipment (UE) experiences mobility, leading to disruptions in D2D communication.
Innovation Solution
A method and apparatus for a UE to receive and utilize information on radio resources allowed for D2D operations in a target cell during handover procedures, allowing for suspension and resumption of D2D resources to ensure continuity of D2D communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover procedure is performed for mobile UE, then UE can maintain connectivity during mobility, but D2D radio resources may be disrupted or lost
Solution Approach 1:
The source eNB performs preliminary actions by determining and forwarding D2D radio resource information to the target eNB before the handover is completed. This advance preparation ensures that the target eNB already has the necessary resource information ready, preventing disruption to D2D operations during the handover execution phase.
Solution Approach 2:
The source eNB acts as an intermediary by receiving D2D resource information from the UE and forwarding it to the target eNB. This intermediary role ensures seamless transfer of resource information during handover, maintaining D2D communication continuity without requiring direct UE involvement in the resource management between cells.
2Reliability
If D2D radio resource information is continuously maintained during handover, then D2D operation continuity is improved, but information management overhead increases
Solution Approach 1:
The invention extracts only the essential D2D radio resource information that needs to be maintained during handover, rather than transferring all possible information. This selective extraction reduces information management overhead while ensuring continuity of D2D operations by focusing only on the critical resource parameters.
Solution Approach 2:
The source eNB discards the burden of continuously managing D2D resource information during handover by forwarding it to the target eNB. The target eNB then recovers and takes over the management of this information, allowing the source eNB to release its resources and reduce its information management overhead after handover completion.
3Productivity
If target eNB receives D2D resource information from source eNB, then resource allocation efficiency is improved, but signaling overhead increases
Solution Approach 1:
The invention merges the D2D resource information transfer with the existing handover signaling procedures. By combining these functions into a single signaling exchange during handover, the patent reduces overall signaling overhead compared to separate dedicated signaling for D2D resource information transfer.
Solution Approach 2:
The handover signaling mechanism is made universal by enabling it to carry both traditional handover information and D2D radio resource information simultaneously. This multi-functionality allows efficient resource allocation for D2D operations without requiring separate dedicated signaling channels, thereby reducing total signaling overhead.
Data Source
AI summary
A method and apparatus for handling radio resources upon mobility in a wireless communication system is provided. In one embodiment, a user equipment (UE) receives information on radio resources allowed for a device-to-device (D2D) operation in a target cell during a handover procedure, and perform the D2D operation in the target cell based on received information on radio resources. In another embodiment, a UE performs a handover procedure or a connection re-establishment procedure, suspends using D2D resources, and resumes suspended D2D resources.