PCell and PSCell Handover RF Timing with Reference Signals
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Solution Overview
Problem
Existing wireless communication systems face interruptions during handover procedures due to uncoordinated radio frequency adjustments for primary and secondary cells, leading to performance loss.
Innovation Solution
The method involves adjusting radio frequencies for target primary and secondary cells based on reference signal occasions, allowing for sequential or parallel processing to minimize interruptions during handover, thereby coordinating RF adjustments to maintain uninterrupted communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RF adjustments are performed for both target PCell and target PSCell during handover, then handover completeness is improved, but communication interruption increases due to uncoordinated adjustments
Solution Approach 1:
The patent applies preliminary action by adjusting RF for the target PCell before adjusting RF for the target PSCell. The method determines that the target PCell is a primary cell and adjusts its RF parameters in advance, then uses this established connection as a baseline before performing the PSCell RF adjustment. This sequential preliminary adjustment ensures that the primary cell connection is stable before adding the secondary cell, preventing simultaneous adjustments from causing communication interruption.
2Speed
If RF adjustments are performed simultaneously for target PCell and target PSCell, then handover speed is improved, but communication stability deteriorates due to coordinated adjustment conflicts
Solution Approach 1:
The patent applies segmentation by dividing the RF adjustment process into separate sequential steps rather than simultaneous execution. The method segments the adjustment into: (1) determining cell types, (2) adjusting RF for target PCell, (3) adjusting RF for target PSCell. This segmentation allows each adjustment to be performed independently and stably, avoiding the coordination conflicts that would occur with simultaneous adjustments, thereby maintaining communication stability while still achieving complete handover.
3Adaptability or versatility
If uncoordinated RF adjustments are performed during handover, then adjustment flexibility is improved, but performance loss increases due to interruptions
Solution Approach 1:
The patent applies feedback by incorporating determination steps that identify whether the target PCell is a primary cell and whether the target PSCell is a secondary cell before executing adjustments. This feedback mechanism allows the system to adapt the adjustment sequence based on cell types, providing flexibility in handling different cell configurations while preventing performance loss through coordinated adjustment timing. The feedback ensures appropriate adjustment ordering to minimize interruptions.
Data Source
AI summary
Provided is a method for a user equipment (UE), comprising: performing, based on a command for a handover (HO) with a primary secondary cell (PSCell), an HO of a target primary cell (PCell) and an addition of a target PSCell; and adjusting a radio frequency (RF) for the HO of the target PCell according to a reference signal (RS) occasion for the HO of the target PCell, and an RF for the addition of the target PSCell according to an RS occasion for the addition of the target PSCell.