D2D Link Establishment via Network-Coordinated Handover
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Solution Overview
Problem
Current D2D communication technologies face inefficiencies in managing direct wireless links, leading to excessive signaling overhead and high power consumption, especially in scenarios with high UE density and mobility, where direct sidelink communication is not reliably established.
Innovation Solution
A method where D2D communication devices receive identifiers from D2D communication messages to control the establishment of direct wireless links, optimizing link setup by assessing message originators and additional conditions like link quality, thereby reducing unnecessary discovery procedures and resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If D2D communication devices continuously monitor and broadcast Direct Communication Request messages to establish direct sidelink communication, then direct link establishment capability is improved, but signaling overhead and power consumption increase excessively
Solution Approach 1:
The patent applies preliminary action by having UEs pre-establish direct sidelink communication links before actual data transmission is needed. When a UE enters a target cell, the direct link is set up in advance during the handover preparation phase, so that when data transmission is required, the link is already available, eliminating the need for continuous monitoring and broadcasting of Direct Communication Request messages.
Solution Approach 2:
The patent uses the serving cell (network infrastructure) as an intermediary to facilitate direct link establishment. The serving cell provides handover commands and coordinates the direct sidelink setup between UEs, replacing the need for UEs to continuously broadcast discovery messages. The network acts as a mediator that enables direct communication without requiring persistent UE-to-UE signaling.
2Reliability
If D2D communication devices use direct discovery procedures to establish sidelink unicast links, then communication reliability is improved, but signaling overhead increases
Solution Approach 1:
The serving cell acts as an intermediary that provides handover commands containing direct link establishment information. This eliminates the need for separate direct discovery message exchanges between UEs, as the network-coordinated handover process inherently establishes the direct link. The signaling is consolidated into the handover procedure rather than requiring additional discovery signaling.
Solution Approach 2:
The patent merges the direct link establishment procedure with the handover procedure. Instead of treating link establishment as a separate discovery phase requiring additional messages, the handover execution phase simultaneously accomplishes both the handover and the direct link setup, combining multiple functions into a single coordinated process.
3Productivity
If D2D communication devices establish direct wireless links in high-density scenarios, then communication efficiency is improved, but link establishment feasibility decreases due to mobility and density
Solution Approach 1:
The patent applies preliminary action by establishing direct links during the handover preparation phase when UEs are still in coverage and network coordination is available. This timing allows the network to select suitable direct link partners and configure parameters before the UE moves to the target cell, ensuring link establishment feasibility even in high-density scenarios where conditions change rapidly.
Data Source
AI summary
A D2D communication device (10) receives a D2D communication message transmitted on a direct wireless link (21) from a first other D2D communication device (10) to a second other D2D communication device (10). The D2D communication message comprises at least one identifier of the first other D2D communication device. Based on the at least one identifier, the D2D communication device controls establishment of a direct wireless link (22) between the D2D communication device (10) and the first other D2D communication device (10).