PSCell Reference Timing for Faster 5G Handover Measurement
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Solution Overview
Problem
The existing handover procedures in 5G wireless communication networks face inefficiencies due to delayed target PSCell measurement during handover, leading to increased signaling time and reduced time efficiency.
Innovation Solution
The proposed solution involves using the SMTC configuration from the source PCell or PSCell for target PSCell measurement, even if asynchronous, allowing for parallel execution of PCell handover and PSCell change or addition procedures, thereby reducing measurement delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If source PSCell is used for reference timing of SMTC, then measurement of target PSCell can be performed, but handover procedure is delayed due to sequential processing
Solution Approach 1:
The patent applies preliminary action by configuring the SMTC window and reference timing for target PSCell measurement before the handover is executed. The UE is pre-configured with measurement objects, reporting configurations, and SMTC parameters so that measurements can immediately begin upon handover command, eliminating the need to wait for source PSCell to complete its current cycle.
Solution Approach 2:
The patent segments the handover procedure by separating the measurement and configuration phases from the execution phase. The measurement configuration (SMTC, reference timing, measurement objects) is prepared independently and can be processed in parallel with other handover preparations, allowing the actual handover execution to start without waiting for measurement completion.
2Measurement precision
If sequential handover procedure is used, then measurement and configuration can be performed accurately, but overall handover speed is reduced
Solution Approach 1:
The patent enables parallel processing by preparing all measurement parameters (SMTC window, periodicity, offset, reference timing) in advance through RRC configuration. This preliminary setup allows the UE to immediately perform measurements on target PSCell using pre-configured parameters without waiting for sequential processing of each parameter.
Solution Approach 2:
The patent introduces a new dimension of parallelism by allowing PSCell measurement and configuration to occur independently from PCell handover procedures. The SMTC configuration for PSCell can be updated and measurements performed simultaneously with PCell handover, effectively adding a parallel execution path that increases overall handover throughput.
Data Source
AI summary
Apparatus and method are provided for a user equipment (UE) to perform measurement operations for a handover procedure including target NR Primary Secondary Cell (PSCell) change or addition. The measurements of a target PSCell are performed in accordance with a synchronization signal/physical broadcast channel (SS/PBCH) block measurement time configuration (SMTC) included in a measurement object received from a base station (BS). A source primary cell (PCell) is used for reference timing of the SMTC if the measurement object is configured by the source PCell on same frequency and subcarrier spacing of the target PSCell. A source PSCell is used for reference timing of the SMTC if the measurement object is configured by the source PSCell on same frequency and subcarrier spacing of the target PSCell.