Releasing Preconfigured Uplink Resources During Handover
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing and releasing preconfigured uplink resources (PUR) in wireless communication systems, particularly in scenarios involving handovers and RRC connection re-establishments.
Innovation Solution
The proposed solution involves a method for releasing preconfigured uplink resources (PUR) in wireless communication systems, specifically by releasing the dedicated PUR configuration when a UE receives a RRCConnectionReconfiguration message comprising mobilityControlInfo, which triggers a handover procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the PUR configuration is maintained during handover, then resource continuity is improved, but resource collisions occur
Solution Approach 1:
The patent applies preliminary action by releasing the PUR configuration before the handover is completed. When the UE receives the handover command (RRCConnectionReconfiguration with mobilityControlInfo), it proactively releases the PUR configuration associated with the source cell, preventing potential resource collisions with the target cell while maintaining smooth transition.
2Object-affected harmful factors
If the PUR configuration is released during handover, then resource collisions are prevented, but transmission seamless is compromised
Solution Approach 1:
The patent resolves this contradiction by performing the PUR configuration release at the precise moment when the UE receives the handover command, before actual transmission on the new cell begins. This timing ensures resource collisions are prevented while the UE can quickly establish new PUR configuration at the target cell, maintaining transmission seamless.
Solution Approach 2:
The patent applies dynamics by making the PUR configuration state changeable during handover. The configuration is dynamically released when receiving handover command and can be reconfigured at the target cell, allowing the system to adapt to changing cellular environments while maintaining continuous service.
3Object-affected harmful factors
If the PUR configuration is released upon receiving RRCConnectionReconfiguration with mobilityControlInfo, then resource collision prevention is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously release its own PUR configuration when it receives the handover command. The UE independently determines that the source cell PUR configuration is no longer valid and releases it without requiring explicit network command, simplifying the overall system complexity while effectively preventing resource collisions.
Data Source
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AI summary
A method and apparatus are disclosed. In an example from the perspective of a User Equipment, UE, the UE keeps a dedicated Preconfigured Uplink Resources, PUR, configuration when the UE is in Radio Resource Control, RRC, idle state and a serving cell of the UE is a second cell, wherein the UE is configured with the dedicated PUR configuration in a first cell different than the second cell (1205). The UE selects a third cell during a RRC connection reestablishment procedure (1210). In response to the selecting the third cell, the UE determines whether or not to release the dedicated PUR configuration based upon whether or not the third cell is the same as the first cell, wherein the determining whether or not to release the dedicated PUR configuration is performed when the UE is in RRC connected state (1215).