D2D Resource Allocation During LTE Cell Handover
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Solution Overview
Problem
In the LTE system, during a cell handover, D2D UE faces challenges in determining a suitable D2D transmission resource in the destination cell, leading to disruptions in Device to Device (D2D) communication services.
Innovation Solution
A method and apparatus are proposed to indicate D2D related information and determine a D2D transmission resource by transmitting a handover request message with D2D information from the source base station to the destination base station, which then allocates and communicates the resource allocation type and D2D transmission resource back to the D2D UE, ensuring seamless handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the D2D UE performs cell handover without D2D resource indication, then the handover procedure is simple, but the D2D communication service is disrupted
Solution Approach 1:
The source base station performs preliminary actions by determining and indicating the D2D resource allocation type and D2D transmission resource to the destination base station before the handover is executed. This advance preparation ensures that the D2D UE can seamlessly continue communication in the destination cell without service disruption.
Solution Approach 2:
The source base station acts as an intermediary by determining the D2D resource allocation type and transmission resource, then conveying this information to the destination base station through the handover request message. This intermediary action ensures proper resource allocation without requiring complex direct interaction between the D2D UE and destination base station.
2Loss of time
If the D2D transmission resource is not determined during handover, then the handover process is fast, but the D2D transmission quality deteriorates
Solution Approach 1:
The D2D resource allocation type and transmission resource are determined in advance by the source base station before handover execution. This preliminary determination ensures accurate resource allocation without adding time to the actual handover process, as the resources are already prepared and indicated to the destination base station.
3Reliability
If the source base station determines and indicates D2D resource allocation type and transmission resource, then the D2D communication continuity is maintained, but the network signaling overhead increases
Solution Approach 1:
The D2D resource allocation type and transmission resource indication are merged into the existing handover request message between base stations. This combining approach maintains D2D communication continuity while minimizing additional signaling overhead, as the information is transmitted as part of the standard handover procedure rather than as separate messages.
Data Source
AI summary
A method and device for indicating D2D related information and determining D2D transmission resources, the method comprising: transmitting to a target base station a switching request message after determining cell switching for a device to device user equipment (D2D UE), the switching request message comprising D2D related information of the D2D UE; receiving a switching command transmitted by the target base station, the switching command comprising the resource allocation type and/or D2D transmission resource for the D2D UE in a target cell determined by the target base station based on the D2D related information; and transmitting the determined resource allocation type and/or D2D transmission resource to the D2D UE. The present invention solves the existing problem of how to determine D2D transmission resources during cell switching for a UE in D2N connection state.