D2D Direct Link Release via RSRP Threshold and PC5 Signaling
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Solution Overview
Problem
In ProSe communication, there is a need to reduce unnecessary radio resource and power consumption, as well as inefficient operations in device-to-device (D2D) direct communication, particularly in releasing direct links, which leads to increased signaling and resource usage.
Innovation Solution
A method is introduced to optimize D2D direct communication by informing upper layers about the availability of radio resources, allowing for the autonomous release of direct links when the RSRP threshold is met, and exceptional PC5 signaling procedures to manage resource usage efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a UE autonomously releases a direct link when RSRP threshold is met, then radio resource consumption is reduced, but communication reliability may deteriorate due to potential premature link release
Solution Approach 1:
The patent implements feedback mechanisms where UEs exchange RSRP measurements and link status information through PC5 signaling. The releasing UE notifies the peer UE before link release, allowing the peer UE to prepare for link termination and maintain communication reliability while enabling resource release.
Solution Approach 2:
The patent applies preliminary action by having the releasing UE notify the peer UE in advance before actually releasing the direct link. This advance notification allows the peer UE to prepare for link termination, switch to alternative communication paths if needed, and maintain overall communication reliability while enabling efficient resource release.
2Reliability
If PC5 signaling is performed for direct link release, then communication reliability is improved through coordination, but signaling overhead and power consumption increase
Solution Approach 1:
The patent applies partial action by implementing PC5 signaling only when necessary for direct link release, rather than continuous signaling. The signaling is triggered selectively based on RSRP threshold conditions, reducing overall power consumption while maintaining reliability when needed.
Solution Approach 2:
The patent uses parameter changes by monitoring RSRP values and comparing them against thresholds to trigger signaling events. This parameter-based approach ensures signaling occurs only when link quality degrades sufficiently, optimizing the balance between reliability maintenance and power consumption reduction.
3Use of energy by moving object
If direct link release procedures are simplified, then power consumption is reduced, but peer UE communication efficiency deteriorates due to lack of notification
Solution Approach 1:
The patent applies self-service by enabling UEs to autonomously determine when to release direct links based on locally measured RSRP values and configured thresholds. Each UE independently evaluates link quality and initiates release procedures when conditions are met, reducing the need for complex coordinated procedures while maintaining efficiency.
Data Source
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AI summary
Disclosed are a method for performing direct communication and a remote UE, the method: receiving, at a Prose layer or an NAS layer of the remote UE, from a lower layer, information indicating that the use of a wireless resource for direct communication with relay UE is stopped since a predetermined AS condition is not satisfied; and stopping communication with the relay UE through a PC5 interface and locally releasing a direction connection with the relay UE.