Joint D2D Handover Mechanism for Wireless Signaling Reduction
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Solution Overview
Problem
Multi-cell device-to-device (D2D) connections in wireless communications require separate handovers for each device, leading to increased control signaling burden and decreased efficiency due to the involvement of adjacent cells, which can be inefficient when devices are in close proximity.
Innovation Solution
A method for initiating a joint handover of both devices in a D2D pair to a target base station, involving a handover request message with a proposed common identifier and radio resource allocation, followed by a confirmation and command to the devices to handover, allowing them to autonomously reconfigure and initiate the transfer, thereby reducing the need for separate cell management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate handovers are initiated for each device in a D2D pair, then handover can be performed for multi-cell D2D connections, but the signaling burden increases and efficiency decreases
Solution Approach 1:
The patent combines separate handover procedures into a single joint handover operation. The source base station coordinates with the target base station to perform handover for both D2D devices simultaneously, sharing target cell information and resource allocation between the devices. This merging approach maintains handover capability for multi-cell D2D connections while significantly reducing control signaling burden compared to initiating separate handovers for each device.
2Adaptability or versatility
If separate handovers are initiated for each device in a D2D pair, then handover can be performed for multi-cell D2D connections, but the efficiency of D2D connection decreases
Solution Approach 1:
The source base station performs preliminary coordination with the target base station before executing the handover. The source base station shares target cell information and resource allocation with the target base station in advance, allowing the target base station to prepare resource allocation for both D2D devices beforehand. This preliminary action enables efficient joint handover execution, improving D2D connection efficiency by avoiding repeated signaling exchanges during the actual handover process.
Data Source
AI summary
Methods and apparatus, including computer program products, are provided for D2D handovers. The method may include sending to a target base station a handover request message including a proposed common identifier for a device-to-device pair and a proposed allocation of radio resources for the device-to-device pair; receiving, from the target base station in response to the handover request message, a handover request reply message including a confirmation of the proposed allocation and of the proposed common identifier; sending to a first device of the device-to-device pair a handover command including the proposed allocation and the proposed common identifier; receiving, from a second device of the device-to-device pair, a measurement report representative of the target base station; and determining whether to initiate a handover of the second device to the target base station, wherein when the handover is initiated, the first device of the device-to-device pair and the second device of the device-to-device pair are handed over to the target base station. Related apparatus, systems, methods, and articles are also described.