Mobile Device Channel Scan Sequence Optimization
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Solution Overview
Problem
Mobile devices experience packet drops and communication disruptions during channel scans for access points, as they need to temporarily disconnect from the home access point to scan foreign channels.
Innovation Solution
Implementing a scanning sequence that includes multiple portions of a predefined scan interval for scanning foreign channels, interspersed with intermediate home channel dwell periods, allowing the device to return and receive buffered data packets during these dwell periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the device performs a channel scan by moving away from the home access point channel, then the device can detect foreign access points, but packets are dropped from ongoing communications
Solution Approach 1:
The channel scan is divided into multiple discrete channel hops rather than a continuous scan. The device segments the scanning process into individual channel transitions, allowing it to briefly tune to foreign channels for detection while returning to the home channel in between, thus maintaining communication reliability while still detecting foreign access points
Solution Approach 2:
The device implements periodic channel scanning where it alternates between scanning foreign channels and returning to the home channel. This periodic action allows the device to perform detection functions at regular intervals while ensuring continuous packet reception during home channel dwell periods, resolving the contradiction between detection capability and communication reliability
2Measurement precision
If the device moves away from the home access point channel for the duration of the scan, then the device can identify potential access points, but communication quality deteriorates
Solution Approach 1:
The scan duration is segmented into multiple short channel hops rather than one long continuous scan. Each hop briefly tunes to a foreign channel for identification, then returns to the home channel. This segmentation maintains communication quality by limiting the time away from the home channel while still enabling thorough access point identification across multiple channels
Solution Approach 2:
The device performs partial scans at multiple discrete channels rather than exhaustive continuous scanning. By sampling foreign channels at specific intervals and returning to the home channel, the device achieves sufficient access point identification without the full communication degradation that would result from prolonged continuous scanning
3Measurement precision
If the device performs continuous channel scanning, then the device can detect all foreign access points, but the time away from home access point increases
Solution Approach 1:
The continuous scan is segmented into discrete channel hops with brief dwell times at each foreign channel. This segmentation allows the device to detect foreign access points across multiple channels while minimizing total time away from the home channel, as the device quickly transitions between channels and returns home frequently
Solution Approach 2:
The device implements periodic channel sampling rather than continuous scanning. By periodically hopping to foreign channels for brief detection windows and returning to the home channel, the device achieves adequate detection coverage while significantly reducing the cumulative time spent away from the home access point compared to continuous scanning
Data Source
AI summary
A mobile computing device comprising: a wireless communications interface; a controller configured to: detect a scan condition to scan a foreign channel while connected to a home base station; implement a scanning sequence including: (a) a plurality of portions of a predefined scan interval for scanning the foreign channel, and (b) an intermediate home channel dwell period scheduled between each of the plurality of portions of the predefined scan interval; and during each intermediate home channel dwell period, return to the home base station to receive data packets buffered during a preceding portion of the predefined scan interval.