Dynamic RSRP Difference-Based Measurement Reporting
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Solution Overview
Problem
In 4G LTE communication systems, wireless communication devices spend substantial reverse link bandwidth sending measurement reports of reference signal received power (RSRP) and quality (RSRQ) to eNodeB for handover decisions, which can be inefficient when there are multiple candidate cells with similar RSRP values.
Innovation Solution
The wireless communication device measures RSRP and RSRQ values of candidate sectors, determines the greatest relative difference, and only transfers RSRP values of all sectors if the difference exceeds a threshold, while transferring RSRP and RSRQ of the strongest sector if the difference falls below the threshold, optimizing the measurement report size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE sends measurement reports containing both RSRP and RSRQ values of all candidate cells, then the eNodeB can make accurate handover decisions, but the reverse link bandwidth is substantially consumed
Solution Approach 1:
The patent applies local quality by differentiating the treatment of measurement data based on local conditions (RSRP difference). When RSRP values are similar (small difference), both RSRP and RSRQ are reported for all cells. When RSRP values differ significantly (large difference), only RSRP is reported. This conditional approach optimizes bandwidth usage while maintaining handover decision accuracy under different signal conditions.
Solution Approach 2:
The patent changes the parameter set being transmitted based on the calculated RSRP difference threshold. The measurement report dynamically includes either {RSRP, RSRQ} for all candidate cells or only {RSRP} values, depending on whether the RSRP difference between strongest and other candidate cells exceeds the threshold. This parameter adaptation reduces reverse link bandwidth consumption while preserving necessary information for handover decisions.
2Loss of information
If the UE sends measurement reports of all candidate cells, then complete information is provided for handover decisions, but the report size becomes large when multiple cells have similar RSRP values
Solution Approach 1:
The patent extracts only the necessary measurement parameters based on the RSRP difference condition. When the difference exceeds the threshold, RSRQ values are extracted and excluded from the report, keeping only RSRP values. This selective extraction reduces report size while maintaining sufficient information for handover decisions in scenarios with significant signal strength variations.
Solution Approach 2:
The patent applies partial action by reporting a subset of available measurement data. Instead of always reporting all RSRP and RSRQ values for all candidate cells, the system reports only the necessary subset based on the RSRP difference threshold, reducing report size while providing adequate information for handover under different channel conditions.
3Loss of energy
If the UE reduces measurement report size by sending only RSRP values, then reverse link bandwidth is conserved, but handover decision accuracy may be impacted when RSRP values are similar
Solution Approach 1:
The patent implements a dynamic measurement reporting strategy where the report content adapts to the measured RSRP difference. The system dynamically switches between two reporting modes: full reporting ({RSRP, RSRQ} for all cells) when RSRP values are similar, and reduced reporting (only RSRP) when RSRP values differ significantly. This dynamic adaptation ensures handover decision accuracy is maintained when needed while conserving bandwidth when sufficient.
Data Source
AI summary
A wireless communication device comprises a wireless communication transceiver and a processing system. The wireless communication transceiver is configured to measure reference signal received power (RSRP) values and reference signal received quality (RSRQ) values of a plurality of candidate sectors. The processing system is configured to determine a greatest relative difference between the RSRP values of the candidate sectors. If the greatest relative difference between the RSRP values of the candidate sectors falls below a power threshold, the processing system is configured to direct the wireless communication transceiver to transfer the RSRP values of the candidate sectors and one of the RSRQ values associated with a strongest candidate sector that has a greatest RSRP value of the candidate sectors, and if the greatest relative difference between the RSRP values of the candidate sectors exceeds the power threshold, the RSRP values of the candidate sectors are transferred.