Relay UE Group Mobility Management for D2D Signaling Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing device-to-device (D2D) direct communication, particularly in reducing power consumption and signaling overhead, and achieving effective mobility management in ProSe communication environments.
Innovation Solution
A method involving the reception of an MME identifier from a relay UE, transmission of a TAU request message to an eNB, and formation of a UE group for coordinated mobility management, where the relay UE acts as a representative and the remote UE as a subordinary, allowing context information transfer and paging message forwarding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If each UE performs independent mobility management procedures, then individual UE context control is achieved, but signaling overhead and power consumption increase
Solution Approach 1:
The patent combines mobility management for multiple UEs by allowing one UE to represent a group of UEs in mobility procedures. The representing UE performs TAU procedures on behalf of group members, consolidating signaling operations and reducing individual UE power consumption while maintaining effective mobility control.
Solution Approach 2:
The representing UE serves multiple functions: it acts as both a regular UE for its own communication needs and as a representative for group mobility management. This multi-functionality allows the system to reduce overall signaling overhead while maintaining individual context control when needed.
2Reliability
If separate MMEs manage context information for relay UE and remote UE, then individual context control is maintained, but signaling overhead increases
Solution Approach 1:
The patent merges context information management by allowing a single MME to store and manage context for both the relay UE and remote UE. This consolidation reduces signaling overhead between MMEs while maintaining reliable context information through unified management and appropriate context transfer mechanisms.
3Use of energy by moving object
If relay UE and remote UE form a UE group for coordinated mobility management, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent segments mobility management functions by designating one UE as a representative for group operations while other UEs can operate independently when needed. This segmentation reduces overall complexity by dividing responsibilities rather than requiring all UEs to participate in all management functions simultaneously.
Data Source
AI summary
Disclosed are a direct communication method and ProSe-enabled UE, the direct communication method receiving an identifier of MME supporting relay UE from the relay UE in which a direct connection to remote UE is established, and transmitting, to a base station supporting the relay UE, a TAU request message for requesting the MME supporting the relay UE to manage context information of the remote UE together, and the identifier of MME.