5G UE Handoff Measurement Procedure for Signal Accuracy
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Solution Overview
Problem
Traditional measurement procedures in wireless communication networks often result in stale and inaccurate signal strength measurements due to delayed transmission of measurement reports, leading to handoff failures and reduced throughput, especially in dynamic channel conditions.
Innovation Solution
A method for a user equipment (UE) to perform additional signal strength measurements before the expiration of a Time to Trigger (TTT) time period, configuring the number of measurements based on motion status and classifying neighbor base stations to prioritize accurate handoff candidate selection, ensuring timely and reliable measurement reports to the serving base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits until the TTT time period expires before transmitting the measurement report, then the handoff decision can be made with sufficient time, but the measurement becomes stale and inaccurate in dynamic channel conditions
Solution Approach 1:
The UE performs additional signal strength measurements before the TTT time period expires to obtain current and accurate measurements. By taking preliminary measurements ahead of time, the system ensures measurement freshness without compromising the handoff decision process, resolving the contradiction between timely accurate measurements and sufficient decision time.
2Measurement precision
If the UE performs multiple additional signal strength measurements before TTT expiration, then measurement accuracy improves, but the complexity of the measurement procedure increases
Solution Approach 1:
The measurement procedure is made dynamic by adapting the number of additional measurements based on UE motion status. When the UE is stationary, fewer measurements are needed; when in motion, more measurements are performed. This dynamic adjustment optimizes measurement accuracy while avoiding unnecessary complexity in stable conditions.
Solution Approach 2:
The system changes the parameter of measurement count based on detected motion conditions. By monitoring whether the UE is stationary or moving, the system adjusts the number of additional signal strength measurements accordingly, balancing accuracy requirements with procedural simplicity.
3Speed
If the UE sends the measurement report earlier than TTT expiration, then the handoff can be executed more timely, but the measurement may be premature and inaccurate
Solution Approach 1:
The UE performs additional measurements before TTT expiration to have accurate measurement data ready in advance. This preliminary measurement action enables the system to send the measurement report earlier than traditional approaches while ensuring the measurements are current and accurate, thus improving handoff speed without sacrificing reliability.
Data Source
AI summary
This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer-readable media, for implementing a robust measurement procedure for neighbor base stations (BSs) that are handoff candidates. In some aspects, a user equipment (UE) may designate a first 5G New Radio (NR) neighbor BS as a handoff candidate for the UE based on a first signal strength measurement. The UE may configure a measurement time interval to perform one or more additional signal strength measurements prior to expiration of a time to trigger (TTT) time period. The UE may determine the measurement time interval based on a duration of the TTT time period configured by a serving BS and a number of additional signal strength measurements. The UE may transmit a measurement report to the serving BS after performing the last signal strength measurement and prior to expiration of the TTT time period.