Wireless Device Search Window Adjustment for Power Conservation
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Solution Overview
Problem
Conventional methods for detecting signals in CDMA networks using large search windows do not optimize battery power, leading to unnecessary power consumption when signal strength is strong and multipath effects are minimal.
Innovation Solution
Adjusting the search-window size based on battery power level and active-set signal strength to reduce power consumption without compromising call quality, by using a reduced search-window size when battery power is sufficient and signal strength is good.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large search-window size is used to account for multipath effects and large distances, then signal detection reliability is improved, but battery power consumption increases
Solution Approach 1:
The search window size is made dynamic rather than fixed. The system continuously monitors signal strength and adjusts the search window size accordingly - using larger windows when signal strength is weak and smaller windows when signal strength is strong, thereby adapting the power consumption to actual operational needs
Solution Approach 2:
The patent changes the parameter of search window size based on measured signal strength conditions. When the pilot signal strength exceeds a threshold, the system reduces the search window size to conserve battery power, while maintaining adequate search capability when signal conditions require larger windows
2Reliability
If a single large search window is used for all signal sets, then signal detection coverage is improved, but power consumption increases unnecessarily when signal strength is strong
Solution Approach 1:
Different search window sizes are applied to different signal sets based on their individual signal strengths. Instead of using a uniform large search window for all sectors, the system applies locally optimized window sizes - smaller windows for strong signals and larger windows for weak signals - thereby reducing overall power consumption while maintaining detection coverage
3Use of energy by moving object
If a reduced search-window size is used to conserve battery power, then power consumption is reduced, but signal detection capability may be compromised
Solution Approach 1:
The system implements feedback control by continuously monitoring pilot signal strength and using this information to adjust the search window size. This closed-loop approach ensures that the search window is reduced only when signal strength conditions permit, thereby conserving battery power without compromising signal detection capability when conditions require larger windows
Data Source
AI summary
Methods and apparatus are provided for a wireless communication device (WCD) to adjust a respective search-window size for one or more search windows. In an embodiment, the WCD monitors a battery power level of a WCD. The WCD then adjusts a respective search-window size of one or more search windows of a WCD based on at least the battery power level. In another embodiment, the WCD monitors a WCD's battery power level and the strength of one or more signals in an active set. The WCD 102 then adjusts a respective search-window size of one or more search windows based on at least the battery power level and the strength of one or more active-set signals.