PSCell Handover Trigger Message for Reliable Release
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) experiences hard disconnection from a source Primary Secondary Cell (PSCell) without a release time during handover to a target PSCell, leading to inadequate transition periods for source PSCell release.
Innovation Solution
The UE performs PSCell addition/change in response to receiving a trigger message from or sending a trigger message to the target Primary Cell, allowing for a time gap or transition period between message transmission and HO command receipt, ensuring source PSCell release time during handover with the new PSCell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the UE performs hard disconnection from the source PSCell during handover to target PSCell, then the handover speed is improved, but the source PSCell release time becomes insufficient leading to connection issues
Solution Approach 1:
The UE performs preliminary actions by sending a trigger message to the target PCell before completing the handover to target PSCell. This trigger message initiates the source PSCell release process in advance, ensuring that the release time is sufficient while maintaining fast handover performance. The preliminary action of triggering the release process resolves the contradiction between speed and reliability.
2Reliability
If the UE waits for source PSCell release before handover, then the source PSCell release reliability is improved, but the handover delay increases
Solution Approach 1:
The UE sends a trigger message to the target PCell as a preliminary action during the handover process. This trigger initiates the source PSCell release procedure without requiring the UE to wait for the release to complete before proceeding with handover. The preliminary triggering mechanism ensures reliable release while minimizing handover delay.
Solution Approach 2:
The target PCell acts as an intermediary in the release process. When the UE sends a trigger message to the target PCell, the target PCell facilitates the source PSCell release by coordinating with the network. This intermediary mechanism enables asynchronous release handling, improving reliability without increasing handover delay.
3Device complexity
If the UE performs handover without trigger message mechanism, then the device complexity is reduced, but the handover efficiency decreases due to inadequate release time management
Solution Approach 1:
The UE autonomously manages the source PSCell release by sending a trigger message to the target PCell during handover. This self-service mechanism allows the UE to initiate and coordinate its own release process without requiring complex network-controlled procedures. The trigger message mechanism improves handover efficiency while maintaining relatively simple device complexity.
Data Source
AI summary
Provided is a method for a user equipment. The method includes starting performing a handover (HO) with a target Primary Secondary Cell (PSCell) in response to receiving an HO command instructing the HO with the target PSCell, wherein the HO with the target PSCell comprises target PSCell addition/change, and performing the target PSCell addition/change in response to receiving a trigger message from a target Primary Cell (PCell) or sending a trigger message to the target PCell, wherein the trigger message is a message transmitted between the UE and the target PCell during the HO with the target PSCell.