Measurement Report Triggering Using Multi-Beam Evaluation
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in determining when to send measurement reports, leading to unnecessary cell-level handover operations, also known as Ping-Pong events, due to the lack of comprehensive evaluation of signal beams from both serving and neighboring base stations.
Innovation Solution
A method where a mobile terminal receives a measurement configuration message indicating a predetermined number of signal beams from both serving and neighboring base stations, measures these beams, identifies the best ones, and sends a measurement report to the serving base station when a defined measurement event occurs, which can include criteria such as signal strength, noise ratio, or threshold comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement report triggering is based on single best beam from serving cell, then handover decision is simple and fast, but unnecessary handovers occur due to incomplete evaluation
Solution Approach 1:
The patent segments the beam evaluation process into two distinct parts: (1) evaluating the best N1 beams from the serving cell, and (2) evaluating the best N2 beams from neighboring cells. This segmentation allows comprehensive evaluation of multiple beams while maintaining clear decision logic, thereby improving handover decision accuracy without excessive complexity.
Solution Approach 2:
The patent extends the traditional single-dimension beam evaluation (only serving cell) to a two-dimension evaluation by simultaneously considering beams from both serving cell and neighboring cells. This dimensional expansion enables more informed handover decisions by comparing multiple beams across different cells, reducing unnecessary handovers.
2Reliability
If multiple signal beams are evaluated for handover decision, then handover accuracy improves, but processing time and complexity increase
Solution Approach 1:
The patent applies partial action by evaluating only the top N1 best beams from serving cell and top N2 best beams from neighboring cells, rather than evaluating all available beams. This selective evaluation maintains high decision accuracy while significantly reducing processing time and complexity compared to exhaustive evaluation.
Solution Approach 2:
The patent introduces configurable parameters N1 and N2 that control the number of beams evaluated from serving and neighboring cells respectively. By adjusting these parameters, the system can optimize the trade-off between decision accuracy and processing time, allowing flexible adaptation to different network conditions and requirements.
3Reliability
If comprehensive beam measurement from multiple base stations is performed, then unnecessary handovers are reduced, but measurement and reporting overhead increases
Solution Approach 1:
The patent creates a universal measurement evaluation framework that can handle both serving cell beam evaluation and neighboring cell beam evaluation using the same procedure. The base station configures measurement resources once, and the UE applies the same measurement and evaluation logic for both serving and neighboring cells, reducing configuration complexity while achieving comprehensive evaluation.
Solution Approach 2:
The base station performs preliminary action by pre-configuring the measurement parameters N1 and N2 along with measurement resources before the UE performs actual measurements. This preliminary configuration simplifies the UE's measurement process and reduces real-time processing complexity, while still enabling comprehensive beam evaluation for stable handover decisions.
Data Source
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AI summary
Aspects of the disclosure provide a method that includes receiving a measurement configuration message indicating a predetermined number. A measurement event is defined based on the predetermined number of signal beams from a serving base station and the predetermined number of signal beams from a neighboring base station. The method also includes identifying a first number of best signal beams from the serving base station and a second number of best signal beams from the neighboring base station, where the first number and the second number are equal to or less than the predetermined number. The method further includes determining whether the measurement event occurs based on the first number of best signal beams from the serving base station and the second number of best signal beams from the neighboring base station, and sending a measurement report when the measurement event occurs.