UE Cell Reselection via Dynamic Receiver Sensitivity
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Solution Overview
Problem
Current cellular network technologies perform premature interRAT handovers due to assuming constant receiver sensitivity, leading to early handovers and poor customer experience, especially when user equipment has higher receiver sensitivity than minimum regulatory requirements, and do not adequately consider varying uplink power capabilities.
Innovation Solution
User equipment maintains a normalized transmission power value and determines a signal power value by combining pathloss and transmission power, allowing for informed cell re-selection decisions based on actual signal strength, and reports its supported receiver sensitivity to the base station for optimized handover decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station uses minimum receiver sensitivity for handover decisions, then the handover decision is simple and reliable, but the handover occurs too early causing poor customer experience
Solution Approach 1:
The patent changes the parameter used for handover decisions from a fixed minimum receiver sensitivity to a dynamic parameter that reflects the actual receiver sensitivity of the user equipment. The base station receives an indicator from the UE about its actual receiver sensitivity and adjusts the handover threshold accordingly, allowing later handovers when the UE can still maintain adequate signal quality.
Solution Approach 2:
The patent implements a feedback mechanism where the user equipment informs the base station about its actual receiver sensitivity capabilities. This feedback allows the base station to make more accurate handover decisions based on the specific UE's abilities rather than using a conservative minimum threshold for all UEs.
2Area of stationary object
If the user equipment has higher receiver sensitivity, then the coverage area is extended, but the base station still performs early handover due to using minimum sensitivity threshold
Solution Approach 1:
The patent enables the base station to adapt the handover threshold parameter based on the actual receiver sensitivity of each UE. This allows UEs with higher sensitivity to maintain connections at greater distances or with lower signal power, effectively extending the usable coverage area while maintaining connection quality.
3Reliability
If the base station performs early interRAT handover, then the handover decision is conservative and reliable, but the network resources are affected more than necessary
Solution Approach 1:
The patent modifies the handover threshold parameter dynamically based on UE-specific receiver sensitivity information. This allows the network to maintain connections longer with UEs that have better sensitivity, reducing unnecessary handovers and the associated network resource consumption for handover procedures and legacy RAT operations.
Data Source
AI summary
The present invention relates to a method for operating a user equipment maintaining a normalized transmission power value, indicating the maximum transmission power of the transmitting circuitry of the user equipment, further comprising the step for the user equipment of: receiving a predetermined sufficient power level to be achieved at the base station receiver from the base station, deriving a pathloss value from signals received from the serving base station, determining a signal power value out of the normalized transmission power value of the user equipment and the pathloss value, and when the determined signal power value level is lower than a predetermined sufficient power level at the base station: performing a cell re-selection to another base station.