L1 Measurement Gap Configuration for Faster Inter-Cell Mobility
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in mobility management, particularly in L1/L2 inter-cell mobility, due to the time-consuming nature of network-level handovers and the need for improved measurement configurations to enhance connectivity during UE movement.
Innovation Solution
Implementing L1 measurement configurations with measurement gaps for inter-cell mobility scenarios, allowing UE to perform L1 measurements on candidate cells within or outside the active bandwidth part (BWP) and with different center frequencies or subcarrier spacings, and transmitting corresponding reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network-level handovers are used for inter-cell mobility, then connectivity is maintained, but handover latency increases and mobility efficiency decreases
Solution Approach 1:
The system performs L1 measurements on candidate cells in advance before handover is needed. The network configures measurement gaps and measurement objects for candidate cells, allowing the UE to pre-evaluate potential target cells. When handover becomes necessary, the decision can be made rapidly based on pre-collected measurement data, significantly reducing handover latency while maintaining connectivity reliability.
2Measurement precision
If measurement configurations are expanded to cover more frequency ranges and BWPs, then mobility measurement accuracy improves, but device complexity and processing overhead increase
Solution Approach 1:
The measurement configuration is segmented into multiple measurement objects, each associated with specific measurement gaps. The network can configure separate measurement objects for different frequency ranges, BWPs, and cell types (intra-frequency, inter-frequency, inter-RAT). This segmentation allows the UE to perform measurements in a structured, manageable way across multiple frequencies and bandwidths without overwhelming complexity, as each measurement object can be independently configured and managed.
Data Source
AI summary
Apparatus, methods, and computer-readable media facilitating wireless communication at a UE are disclosed herein. An example method includes receiving a (L1 measurement configuration for a set of SpCells for L1 or L2 inter-cell mobility, the L1 measurement configuration associated with a measurement gap for a measurement object that is located at least at one of: within a configured BW of an activated serving cell and outside an active BWP, outside the configured BW and outside the active BWP, or within the configured BW and the active BWP and with at least one of a center frequency or a subcarrier spacing that is different than a measured measurement object of the activated serving cell. The example method also includes performing an L1 measurement for a candidate measurement object based on the L1 measurement configuration. The example method also includes transmitting an L1 measurement report based on the L1 measurement.