Prioritized Scan List for Roaming Optimization
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Solution Overview
Problem
The existing wireless communication systems face challenges in maintaining continuous connectivity during roaming, particularly for voice applications, as the process of scanning and associating with a new access point can result in dropped packets or calls due to the time required for the wireless connection transfer.
Innovation Solution
A method and system that collect roaming data to create a prioritized scan list of access points, which is then transmitted to a mobile unit, allowing it to efficiently associate with the next access point by optimizing the scanning order based on historical handoff data and supplemental signal strength information, thereby reducing the association time and minimizing connection drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile unit scans all available radio frequency channels to find the access point with the highest signal strength, then it can ensure finding the best available access point, but the time required for scanning and associating increases, causing dropped voice packets or calls
Solution Approach 1:
The system performs preliminary actions by collecting roaming data from multiple mobile units and pre-generating a prioritized scan list of access points before the actual roaming event occurs. This pre-computed list is stored and ready for immediate use when a mobile unit needs to roam, eliminating the need for time-consuming full channel scans during the critical handoff moment.
Solution Approach 2:
Instead of treating all access points equally, the system applies local quality by creating a prioritized scan list where different access points are assigned different priorities based on historical roaming data, signal strength, and other relevant factors. The mobile unit then scans only the high-priority access points first, rather than scanning all channels uniformly.
2Measurement precision
If the mobile unit performs a complete scan of all channels during roaming, then it can ensure comprehensive coverage detection, but the voice application continuity is disrupted due to the time required for the connection transfer
Solution Approach 1:
The system pre-computes and stores a prioritized scan list before roaming is needed, so that when a mobile unit needs to roam during an active call, it can immediately use the pre-prepared list without performing a complete scan, thus maintaining call continuity while still detecting the best access point.
Solution Approach 2:
The scan process is segmented into priority levels. Instead of scanning all channels equally, the mobile unit scans only the high-priority access points from the prioritized list first, performing a partial scan that is sufficient for maintaining call continuity while still achieving adequate signal detection accuracy.
3Device complexity
If the system uses a standard scan procedure for all mobile units, then the system complexity remains low, but the roaming performance varies and voice packets may be dropped
Solution Approach 1:
The system changes the parameter of scan list prioritization based on collected roaming data. By dynamically adjusting the priority order of access points in the scan list according to historical performance, signal strength, and roaming patterns, the system improves roaming reliability without requiring complex real-time decision-making algorithms during the actual handoff.
Data Source
AI summary
Described is a method including collecting roaming data for a network. The method further includes creating a scan list based on the roaming data, wherein the scan list including a prioritization of a plurality of access points for roaming. The method further includes transmitting the scan list to a mobile unit. Further described in a system including a collection module collecting roaming data for a network. The system further includes a creation module creating a scan list based on the roaming data, the scan list including a prioritization of a plurality of access points for roaming. The system further includes a transmitter transmitting the scan list to a mobile unit.