Remote UE Link Release Timer Prevents Ping Pong Switching
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Solution Overview
Problem
In wireless communication systems, particularly in public safety networks, there is a need for efficient methods to release links between relay User Equipment (UE) and remote UE to prevent ping pong phenomena and ensure reliable service quality, especially when the relay UE's quality deteriorates or needs to prioritize service for other UEs.
Innovation Solution
A method is introduced where the remote UE is prohibited from re-establishing a link with a previously released relay UE for a specific time period, using a connection release message with a cause value indicating the link is no longer necessary or allowed, to prevent frequent switching between relay UEs and maintain network stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the remote UE is allowed to re-establish link with a released relay UE immediately, then the link availability is improved, but ping pong phenomenon occurs causing frequent relay UE changes and network instability
Solution Approach 1:
The patent applies preliminary action by setting a prohibition time period in advance after link release. The remote UE is configured with a timer that prevents it from attempting to re-establish link with the released relay UE before the timer expires. This proactive measure prevents ping pong phenomenon by ensuring that link releases are not immediately reversed, thereby maintaining network stability while preserving link availability within reasonable bounds.
2Adaptability or versatility
If the relay UE quality deteriorates or needs to prioritize service for other UEs, then the service quality for other UEs is improved, but frequent relay UE switching occurs causing network instability
Solution Approach 1:
The patent implements preliminary action by pre-configuring a prohibition time period in the link release message. When a relay UE's quality deteriorates or service prioritization is needed, the remote UE receives the release message with the timer value and is prevented from immediately switching back to the released relay UE. This ensures that service prioritization for other UEs can be executed without causing frequent relay UE switching and network instability.
3Stability of the object's composition
If a timer-based prohibition mechanism is implemented, then ping pong phenomenon is prevented and network stability is improved, but additional signaling overhead and complexity are introduced
Solution Approach 1:
The patent applies parameter changes by introducing a timer parameter (prohibition time period) into the existing link release message framework. Rather than creating a complex new mechanism, the solution modifies the existing protocol by adding a time parameter that controls remote UE behavior. This approach maintains network stability while minimizing protocol complexity, as the timer mechanism leverages existing message structures and UE timer capabilities.
Data Source
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AI summary
Provided are a delinking method implemented by a remote UE in a wireless communication system, and a device using said method. The method is characterized by: receiving a disconnect message for disconnecting a link between a relay UE and the remote UE; disconnecting the link on the basis of the disconnect message; and not attempting to establish a link between the remote UE and the relay UE in a UE-specified time section.