L3 Measurement Reporting in L1 Reports for Handover
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Solution Overview
Problem
Current communication systems face challenges in efficiently reporting L3 measurements to network nodes, particularly in triggering handover events based on L1 and L2 measurements, which affects the quality of wireless communication and mobility management in cellular networks.
Innovation Solution
The solution involves configuring user equipment to report L3 measurements within L1 measurement reports, allowing network nodes to determine trigger events and select new serving cells based on these measurements, incorporating indications of candidate target cells and thresholds for handover decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If L3 measurements are reported separately from L1 measurements, then measurement accuracy is improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent combines L3 measurements and L1 measurements into a single measurement report message. The measurement report includes both L3 inter-frequency measurements and L1 intra-frequency measurements, along with an indication identifying which measurements are L3 measurements. This merging approach maintains measurement accuracy while reducing signaling overhead and processing complexity by eliminating separate reporting mechanisms.
2Reliability
If L3 measurements are used for handover decisions, then mobility management accuracy is improved, but network node processing load increases
Solution Approach 1:
The patent enables network nodes to selectively process L3 measurements based on configuration and trigger events. Not all L3 measurements are processed for handover decisions - only those that meet specific criteria (trigger events, configuration parameters) are utilized. This partial processing approach maintains handover reliability while reducing overall processing load on network nodes.
3Loss of information
If separate reporting mechanisms are used for L1 and L3 measurements, then measurement detail is improved, but signaling overhead increases
Solution Approach 1:
The patent merges L1 and L3 measurement reporting into a single unified message structure. The measurement report contains both L1 measurements (for serving and non-serving cells) and L3 measurements (for inter-frequency cells), with an indication field that identifies which measurements are L3 measurements. This single-report approach preserves complete measurement detail while significantly reducing signaling overhead compared to separate reporting mechanisms.
Data Source
AI summary
There is provided an apparatus comprising means for means for receiving a configuration for L3 measurement reporting at a user equipment from a network node, the configuration comprising an indication of a trigger event for reporting L3 measurements, means for performing the L3 measurements, means for determining the occurrence of the trigger event; and means for, in response to the determining, providing the L3 measurements to the network node in an L1 measurement report.