Dynamic RSRP Weighted Average for Handover Target Cell Selection
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Solution Overview
Problem
Existing handover decision algorithms in cellular communication systems do not effectively consider incremental measurement reports or scaling factors, leading to unnecessary handovers and failures, especially for UEs with low speed or high speed Radio Link Failures, as they rely on static thresholds and do not calculate weighted averages of Reference Signal Received Power (RSRP) values.
Innovation Solution
A method and system that detect neighbor cells, receive periodic measurement reports from User Equipment (UE) with incremental weightages assigned to RSRP values, calculate a weighted average of RSRP values over time, and select the target cell with the highest weighted average for handover requests, thereby improving the reliability and efficiency of handover decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing handover decision algorithms use static thresholds and do not calculate weighted averages of RSRP values, then the handover decision process is simple, but unnecessary handovers and Radio Link Failures occur especially for UEs with low speed or high speed mobility
Solution Approach 1:
The patent applies dynamics by transitioning from static handover thresholds to dynamic weighted average RSRP calculations. The system continuously updates the weighted average of Reference Signal Received Power values from multiple measurement reports, where weights are assigned based on the recency and reliability of measurements. This dynamic approach allows the handover decision to adapt to changing channel conditions and UE mobility patterns, thereby improving handover reliability without excessive complexity
Solution Approach 2:
The patent changes the parameter used for handover decision from simple RSRP threshold comparison to weighted average RSRP calculation. By introducing weights that reflect the quality and recency of measurement reports, the system transforms the decision parameter into a more robust metric that accounts for measurement variations due to UE mobility. This parameter transformation reduces unnecessary handovers while maintaining algorithmic tractability
2Reliability
If handover decision algorithm re-executes to determine another target cell after handover failure, then another target cell can be selected, but time is lost and additional failures may occur
Solution Approach 1:
The patent applies preliminary action by pre-calculating and maintaining a ranked list of candidate target cells based on their weighted average RSRP values before handover failure occurs. When a handover fails, the system can immediately select the next best candidate from the pre-evaluated list without re-executing the entire decision algorithm. This preliminary preparation significantly reduces the time required for alternative handover attempts and improves overall handover success rate
3Adaptability or versatility
If existing algorithms do not consider scaling factors of UE at eNodeB, then the algorithm is simpler, but unnecessary handovers occur for low speed UEs and Radio Link Failures occur for high speed UEs
Solution Approach 1:
The patent applies local quality by introducing UE-specific scaling factors that adapt the handover decision to the mobility characteristics of individual UEs. The scaling factor is determined based on UE speed and mobility pattern, allowing the algorithm to adjust the sensitivity of handover triggers locally for each UE. This enables the system to prevent unnecessary handovers for low-speed UEs while facilitating timely handovers for high-speed UEs, improving adaptability without significantly increasing overall system complexity
Data Source
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AI summary
Systems and methods for selecting a target cell during a handover procedure at a serving cell are disclosed. A plurality of neighbor cells is detected. A plurality of Measurement Reports (MRs) comprising Reference Signal Received Power (RSRP) values of the plurality of neighbor cells is received from the user equipment (UE). Incremental weightages are assigned to the RSRP values of each MR of the plurality of MRs. Based on the RSRP and the incremental weightages assigned, a weighted average of the RSRP values for each neighbor cell is calculated. Based on the weighted average, a target cell is selected to send a handover request. A target cell is selected from the plurality of neighbor cells based on the weighted average of the RSRP values. the target cell is selected based on a periodic interval time and scaling factors as per UE speed to determine the handover.