Subcell Measurement Rate Adaptation for Wireless Handover
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Solution Overview
Problem
In wireless communication systems utilizing coordinated multipoint transmission from multiple subcells, existing methods require mobile terminals to continuously measure and evaluate downlink signal information from all identified subcells, leading to increased processing and signaling overheads, which can degrade user throughput and increase interference due to unnecessary measurements.
Innovation Solution
A mobile terminal selectively increases the measurement or event evaluation rate for subcell-specific signals based on predetermined criteria related to common channel signal quality, such as exceeding a threshold or relative differences with serving cell signals, reducing unnecessary measurements and reports only when necessary, like during handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile terminals continuously measure and evaluate downlink signal information from all identified subcells, then measurement accuracy and handover reliability are improved, but processing overhead and signaling overhead increase
Solution Approach 1:
The patent implements dynamic measurement configuration where the measurement bandwidth and subcell quantity are adjusted based on terminal mobility state. High-speed terminals receive wider bandwidth and more subcell measurements, while low-speed terminals receive narrower bandwidth and fewer measurements. This dynamic adaptation resolves the contradiction by providing high reliability only when needed (for high-speed terminals) while reducing processing overhead for low-speed terminals.
Solution Approach 2:
The patent applies different measurement qualities to different terminal types. High-speed terminals receive enhanced measurement resources (wider bandwidth, more subcells) while low-speed terminals receive standard measurement resources. This local differentiation resolves the contradiction by concentrating measurement resources on terminals that actually need high reliability handovers (high-speed terminals) rather than uniformly applying high measurement quality to all terminals.
2Reliability
If mobile terminals continuously measure and evaluate downlink signal information from all identified subcells, then handover reliability is improved, but user throughput decreases due to processing overhead
Solution Approach 1:
The patent dynamically adjusts measurement configuration based on terminal speed, allowing high-speed terminals to maintain high handover reliability through extensive measurements while low-speed terminals experience reduced processing overhead that preserves user throughput. This resolves the contradiction by making handover reliability adaptive rather than uniform across all terminals.
Solution Approach 2:
The patent changes key measurement parameters (bandwidth, subcell quantity) based on terminal mobility state. By adjusting these parameters dynamically, the system achieves high handover reliability for high-speed terminals while maintaining high user throughput for low-speed terminals, thus resolving the contradiction between reliability and productivity.
3Measurement precision
If mobile terminals continuously measure and evaluate downlink signal information from all identified subcells, then measurement precision is improved, but interference increases due to unnecessary measurements
Solution Approach 1:
The patent implements dynamic measurement configuration where the measurement intensity (bandwidth and subcell quantity) is adjusted based on terminal speed. High-speed terminals receive high measurement precision resources while low-speed terminals receive reduced measurement resources. This resolves the contradiction by providing high measurement precision only when actually needed (for high-speed terminals) rather than continuously for all terminals, thereby reducing unnecessary interference.
Solution Approach 2:
The patent applies partial measurement action to low-speed terminals (reduced bandwidth and subcell quantity) and excessive measurement action to high-speed terminals (wider bandwidth and more subcells). This differentiated approach resolves the contradiction by providing measurement precision proportional to actual need, reducing unnecessary measurements and their associated interference for low-speed terminals.
Data Source
AI summary
Methods and apparatus are disclosed for reporting downlink signal measurement information in a wireless communication system utilizing coordinated multipoint transmission from two or more subcells in each of a plurality of cells. The method comprises monitoring signal quality metrics for a first set of downlink signals comprising at least a first common channel signal transmitted from two or more subcells of a neighbor cell, evaluation of the monitored signal quality metrics, with respect to one or more predetermined criterion, and the selective increasing of a measurement rate, an event evaluation rate, or both, for at least a first subcell-specific signal from the neighbor cell, based on the evaluation.