Mobile Station Access Search Window Adjustment
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Solution Overview
Problem
In current CDMA wireless networks, mobile stations constantly search for pilot signals using a fixed-sized access search window, which is inefficient when the station's position changes, leading to unnecessary resource usage and potential loss of signal peaks within the search window.
Innovation Solution
The mobile station adjusts its access search window based on movement by determining its position at different times, identifying signal peaks, and modifying the search window into smaller windows that encompass these peaks, reducing the search area when the station's position remains relatively stable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed-sized access search window is used to search for pilot signals, then the search process is simple and consistent, but resource usage increases and signal detection efficiency decreases when the mobile station's position changes
Solution Approach 1:
The patent applies the dynamics principle by making the access search window size variable rather than fixed. The system dynamically adjusts the search window size based on the mobile station's movement characteristics - using a first search window size when movement exceeds a threshold and a second, smaller search window size when movement is within the threshold. This resolves the contradiction by adapting the search process to actual signal conditions, improving detection efficiency while reducing unnecessary resource consumption.
Solution Approach 2:
The patent implements parameter changes by modifying the search window size parameter based on movement detection. The system changes the temporal parameter (search window duration) according to the mobile station's position stability, transitioning between different parameter states to optimize both detection efficiency and resource usage under varying operational conditions.
2Loss of energy
If the access search window size is reduced to save resources, then resource usage decreases, but the risk of missing signal peaks increases
Solution Approach 1:
The system dynamically adapts the search window size based on real-time movement conditions. When the mobile station is stationary or moving slowly (movement within threshold), a smaller search window is used to conserve resources while maintaining reliability through subsequent refinement steps. When movement exceeds the threshold, the system automatically switches to a larger search window to ensure complete signal peak capture, thus resolving the reliability-risk contradiction.
Solution Approach 2:
The patent applies segmentation by dividing the search process into multiple stages: initial broad search with a first search window size, followed by refined search with a second, smaller search window size focused on identified signal peaks. This segmented approach ensures comprehensive coverage when needed while enabling resource-efficient refinement, thereby maintaining reliability without excessive resource consumption.
3Reliability
If the mobile station constantly searches through the entire access search window, then all possible signals are detected, but processing time and resource consumption increase
Solution Approach 1:
The patent segments the search process into an initial comprehensive search phase followed by a focused refinement phase. The first search window performs a complete scan to identify signal peaks, ensuring detection completeness. Subsequently, the second, smaller search window concentrates processing resources on refining the detection around identified peaks, significantly reducing processing time while maintaining complete signal detection.
Solution Approach 2:
The system performs preliminary action by conducting an initial broad search to identify signal peak locations before executing the refined search. This preliminary identification step allows subsequent processing to focus only on relevant time intervals, preventing redundant processing and reducing overall processing time while ensuring no signals are missed.
4Reliability
If a larger access search window is used to ensure all signal peaks are captured, then signal detection reliability improves, but resource usage and processing complexity increase
Solution Approach 1:
The patent reduces complexity through segmentation by dividing the search into two distinct phases with different window sizes. The initial phase uses a larger window to ensure complete peak capture, while the refinement phase uses a smaller window focused on specific regions of interest. This segmentation maintains reliability while reducing the computational complexity of continuous large-window processing.
Solution Approach 2:
The system dynamically adjusts window size based on detected conditions rather than using a consistently large window. This dynamic adaptation maintains the reliability benefits of large windows when needed while avoiding the unnecessary complexity and resource consumption of large windows during stationary conditions, thus resolving the complexity-reliability contradiction.
Data Source
AI summary
Methods and systems for adjusting the access search window based on the movement of a mobile station (MS) are disclosed. The MS searches for pilot signals using a search window that has an initial size. At a first and second time, the MS determines its position. The MS then determines the distance between the position of the MS at the first time and the second time. When the distance is less than a threshold distance, the MS measures the strength of a pilot signal within the access search window and identifies one or more signal peaks within the access search window that are above a specified signal strength. Next, the MS modifies the access search window into one or more smaller access search windows. The one or more smaller access search windows collectively have a size that is smaller than the initial size.