Adaptive Cell Search Interval for Mobile Device Battery Conservation
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Solution Overview
Problem
Mobile devices consume excessive battery life due to frequent cell search and measurement operations, especially when stationary, as existing systems apply uniform rules for both moving and stationary devices, leading to unnecessary measurements.
Innovation Solution
A mobile device determines its state as static-idle, static-connected, idle, or connected and adjusts the interval for neighbor cell search and measurements accordingly, reducing frequency for stationary devices to conserve battery life without impacting user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform cell search and measurement rules are applied to all mobile devices, then network reliability is maintained, but battery life is excessively consumed
Solution Approach 1:
The patent applies dynamics by making the cell search and measurement interval adaptive rather than fixed. The system dynamically adjusts the measurement interval based on the device's mobility state (static or moving), transitioning from uniform static rules to dynamic state-dependent rules. This resolves the contradiction by allowing the system to maintain network reliability through measurements when needed while reducing energy consumption during static periods.
Solution Approach 2:
The patent changes the parameter of measurement interval based on device state. By introducing state-dependent interval selection (shorter intervals for moving devices, longer intervals for static devices), the system optimizes the balance between network reliability and battery life. This parameter change allows the same network to serve diverse user behaviors without wasting energy on unnecessary measurements.
2Reliability
If frequent cell search and measurement are performed, then cell reselection and handover reliability are improved, but power consumption increases
Solution Approach 1:
The patent applies partial action by performing cell measurements only to the extent necessary for each device state. Static devices undergo reduced measurement activity compared to moving devices. This selective application of measurement actions maintains sufficient reliability for cell reselection and handover while avoiding excessive power consumption from unnecessary frequent measurements.
Solution Approach 2:
The system dynamically adjusts measurement frequency based on real-time detection of device mobility state. When a device transitions from static to moving, measurement intensity increases to maintain handover reliability. When transitioning back to static, measurement frequency decreases, reducing power consumption. This dynamic adaptation resolves the contradiction between reliability and energy loss.
3Speed
If measurement interval is reduced for static devices, then cell reselection responsiveness is improved, but battery life is shortened
Solution Approach 1:
The patent applies local quality by tailoring measurement interval characteristics to specific device states. Static devices receive longer measurement intervals (lower frequency), while moving devices receive shorter intervals (higher frequency). This localized optimization ensures that battery life is extended for static devices without compromising the responsiveness needed for moving devices, resolving the contradiction between speed and energy consumption.
Data Source
AI summary
System and method embodiments are provided for limiting mobile device neighbor cell measurements for cell reselection and handover. In an embodiment, a method in a mobile device for limiting neighbor cell search and measurements for reselection and handover includes determining a state of the mobile device from one of a plurality of states, wherein the states comprises an idle state, a static-idle state, a connected state, and a static-connected state defining idle state to static-idle state and connected state to static-connected state transition criteria; defining static-idle state to idle state and static-connected state to connected state transition criteria; and selecting a time interval to wait between successive neighbor cell search and measurements for cell reselection and handover according to the state of the wireless device, wherein the time interval corresponding to one of the states is less than the time interval corresponding to another of the states.