UE Motion Detection for Adaptive Cell Search Periodicity
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Solution Overview
Problem
Conventional wireless communication systems face inefficiencies in power consumption and accuracy due to unnecessary cell search and GPS signal acquisition when user equipment (UE) is stationary, leading to wasted energy and potential errors in location determination.
Innovation Solution
The UE dynamically adjusts the periodicity of cell search and GPS signal acquisition based on parameters such as mobility state, battery life, and channel quality, using motion detection information from sensors, filtered frequency error, and Doppler values to optimize these processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE performs cell search and GPS signal acquisition continuously or at fixed intervals, then the positioning accuracy is maintained, but the power consumption increases unnecessarily when the UE is stationary
Solution Approach 1:
The patent applies dynamics by making the cell search and GPS signal acquisition periodicity adaptive rather than fixed. The UE dynamically adjusts the search periodicity based on its motion state detected through sensors (accelerometer, gyroscope, magnetometer) and communication parameters (Doppler shift, frequency error). When the UE is stationary or moving slowly, the periodicity is extended to reduce power consumption. When the UE is moving quickly, the periodicity is shortened to maintain positioning accuracy. This dynamic adjustment resolves the contradiction between maintaining positioning accuracy and reducing power consumption.
Solution Approach 2:
The patent changes the parameter of search periodicity based on motion state parameters. By monitoring parameters such as acceleration magnitude, angular velocity, magnetic field changes, Doppler shift, and frequency error, the system adjusts the time interval between cell search and GPS signal acquisition operations. This parameter change allows the system to optimize the balance between positioning accuracy and power consumption according to actual motion conditions.
2Use of energy by moving object
If the UE reduces the periodicity of cell search and GPS signal acquisition to save power, then power consumption decreases, but the accuracy of motion state detection and positioning deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the UE continuously monitors its motion state through sensors and communication parameters, then uses this feedback to adjust the search periodicity. The system receives feedback from accelerometers, gyroscopes, magnetometers, Doppler measurements, and frequency error measurements to determine whether to extend or reduce the search interval. This closed-loop feedback ensures that positioning accuracy is maintained while optimizing power consumption based on actual motion conditions.
Solution Approach 2:
The patent performs preliminary motion state detection using sensors and communication parameters before deciding on the appropriate search periodicity. By evaluating acceleration, angular velocity, magnetic field changes, Doppler shift, and frequency error in advance, the system determines the UE's motion state and pre-adjusts the search periodicity accordingly. This preliminary action prevents unnecessary searches while ensuring accurate positioning when needed.
3Measurement precision
If the UE performs frequent cell search and GPS signal acquisition, then positioning accuracy is improved, but the device complexity and processing load increase
Solution Approach 1:
The patent extracts and utilizes motion detection information from sensors (accelerometer, gyroscope, magnetometer) and communication parameters (Doppler shift, frequency error) to determine the UE's motion state. By extracting this motion state information, the system can intelligently control when to perform cell search and GPS signal acquisition operations. This extraction approach simplifies the overall system by using readily available sensor and communication data to make informed decisions about positioning operations, reducing unnecessary processing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces power consumption and improves the accuracy of motion state detection, leading to more efficient search and positioning operations, especially when the UE is stationary, thereby enhancing overall network performance.
Implementation Method 1
The one or more parameters may include a motion state of the UE, and the motion state may be determined by a motion sensor of the UE.
Implementation Method 2
techniques for determining the mobility state of the UE by using filtered frequency error and/or Doppler value in addition to motion sensor information
Implementation Method 3
techniques for determining the mobility state of the UE by using filtered frequency error and/or Doppler value in addition to motion sensor information
Data Source
AI summary
Certain aspects of the present disclosure generally relate to enhanced procedures for search, measurement, and positioning with aid of motion detection information. According to certain aspects, a method is provided for wireless communications which may be performed, for example, by a user equipment (UE). The method generally includes determining one or more parameters of the UE; dynamically adjusting a periodicity of at least one of: cell search and measurements or global positioning system (GPS) signal acquisition based, at least in part, on the one or more parameters; and performing at least one of: the cell search and measurements or GPS signal acquisition according to the adjusted periodicity. In aspects, an enhanced technique for motion state detection is provided. The method may result in power savings, for example, when the UE is stationary and can reduce the periodicity that the UE performs search, measurement and GPS signal acquisition.