Adaptive RRM Measurement Interval Based on Angular Motion
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Solution Overview
Problem
Conventional radio resource management (RRM) in cellular communication systems relies solely on distance measurements, which are prone to errors due to blocking objects, leading to unnecessary power consumption and inefficient RRM actions in terminal devices.
Innovation Solution
Utilizing angular motion in conjunction with distance measurements to determine the time interval for RRM, allowing for more accurate RRM relaxation by considering the mobility and direction of the terminal device, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RRM measurements are performed frequently to ensure accurate connectivity management, then measurement precision and reliability are improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the measurement interval adaptive rather than fixed. The system dynamically adjusts the time interval between RRM measurements based on real-time assessment of terminal mobility (angular movement) and distance to cell edge, allowing measurements to be frequent when needed and sparse when unnecessary, thus resolving the contradiction between measurement accuracy and power consumption
Solution Approach 2:
The patent changes the parameter of measurement interval from a static value to a dynamic variable determined by mobility conditions. By calculating angular movement and distance metrics, the system adjusts the measurement interval parameter adaptively, enabling accurate measurements when mobility is high while conserving power when the terminal is stationary or moving slowly
2Use of energy by moving object
If RRM measurements are relaxed to reduce power consumption, then energy efficiency is improved, but measurement precision and handover reliability deteriorate
Solution Approach 1:
The system changes the measurement interval parameter based on mobility assessment. When angular movement is below a threshold and distance to cell edge is sufficient, the measurement interval is extended (relaxation), reducing power consumption while maintaining adequate measurement precision. When mobility increases, the interval shortens automatically to preserve handover reliability
Solution Approach 2:
The measurement relaxation is made dynamic rather than static. The system continuously monitors angular movement and distance parameters, adjusting the measurement interval in real-time to match actual mobility conditions, ensuring that relaxation does not compromise handover reliability when it matters most
3Device complexity
If distance measurements are used alone for RRM decisions, then device complexity is reduced, but measurement precision deteriorates due to blocking objects
Solution Approach 1:
The patent merges angular movement measurement with distance measurement to create a more robust mobility assessment mechanism. By combining these two measurement dimensions, the system achieves higher measurement precision for RRM decisions while maintaining reasonable device complexity, as both measurements can be derived from existing reference signal processing
Data Source
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AI summary
This document discloses a solution for controlling measurements of a terminal device. According to an aspect, a method comprises: determining, on the basis of measurement data measured from a radio link, a distance between an access node and a terminal device and angular motion of the terminal device with respect to the access node; making a decision about a length of a time interval between consecutive radio measurements of the terminal device on the basis of the distance and the angular motion; and communicating the decision over the radio link.