UE Link Transition via Channel Quality Threshold in D2D Relay
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Solution Overview
Problem
In wireless communication systems, particularly in LTE and LTE-Advanced environments, there is a need for efficient methods to change link connections by user equipment (UE) to optimize channel quality and reduce traffic overload, especially in areas with poor coverage where device-to-device (D2D) communication can provide relief but requires intelligent management of link connections.
Innovation Solution
A method and device for a UE to receive threshold values through broadcast signaling, measure channel quality, establish a Radio Resource Control (RRC) connection with a cell when the quality exceeds the threshold, and release the D2D link accordingly, ensuring seamless transition and optimal network utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If D2D link is used to provide relief in poor coverage areas, then network coverage is improved, but link connection management complexity increases
Solution Approach 1:
The UE autonomously determines whether to maintain or release the D2D link by comparing measured channel quality against a threshold value. The UE self-manages the link connection without requiring continuous network control, thereby improving coverage reliability while reducing management complexity.
Solution Approach 2:
The system implements a feedback mechanism where the UE continuously measures channel quality and compares it with a threshold. Based on this feedback, the UE automatically makes decisions about link maintenance or release, enabling adaptive link management that balances coverage improvement with operational simplicity.
2Productivity
If UE autonomously manages link connection changes, then network efficiency is improved, but measurement and decision-making complexity increases
Solution Approach 1:
The network configures a threshold parameter that simplifies the UE's decision-making process. Instead of complex algorithms, the UE only needs to compare measured channel quality against this pre-configured threshold, thereby improving network efficiency while keeping measurement and decision complexity manageable.
Solution Approach 2:
The threshold value acts as an intermediary that mediates between the complex channel quality measurements and the simple binary decision (maintain or release link). This intermediary parameter translates continuous measurement data into actionable decisions, improving efficiency without overwhelming the UE with complexity.
3Reliability
If D2D link is maintained in poor coverage areas, then connection reliability is improved, but network resource utilization deteriorates
Solution Approach 1:
The D2D link configuration is made dynamic rather than static. The UE continuously monitors channel quality and automatically releases the D2D link when conditions improve or when direct cell connection becomes viable. This dynamic adaptation ensures connection reliability when needed while preventing unnecessary resource consumption when D2D is no longer beneficial.
Solution Approach 2:
The UE performs periodic channel quality measurements and re-evaluates the need for D2D link maintenance. This periodic monitoring ensures that the system adapts to changing conditions, maintaining connection reliability during poor coverage while improving network resource utilization when coverage conditions improve.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for changing a connection by a user equipment (UE) connected with a relay UE through a device to device (D2D) link in a wireless communication system, the method comprising: receiving information on a threshold value through a broadcast signaling; measuring a quality of a channel from a cell; establishing a radio resource control (RRC) connection with the cell when the measured quality is higher than the threshold value; and releasing the D2D link with the relay.