Roaming Scanning Time Reduction via Pre-Scanned Channel Data
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication networks, the process of roaming between access points often results in significant scanning time delays and packet loss, particularly for real-time applications like VoIP, due to the need for mobile units to scan all available channels, leading to latency and retransmissions during handoffs.
Innovation Solution
A system and method where a wireless switching device informs mobile units of specific channel information from neighboring access points before scanning, allowing them to associate with the most suitable access point proactively, reducing or eliminating scanning time by tracking the mobile unit's location and anticipated movement, and using beacon signals to transmit channel assignment information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mobile unit scans all available channels to find the best access point during roaming, then it can ensure comprehensive coverage and find the optimal AP, but the scanning time increases significantly causing latency and packet loss
Solution Approach 1:
The system performs preliminary actions by having access points pre-gather information about neighboring APs including their channel assignments, SSIDs, and signal characteristics. This information is cached and made available to mobile units before they need to roam, eliminating the need for extensive real-time scanning and allowing immediate association with the target AP.
Solution Approach 2:
The patent introduces an intermediary mechanism where the current access point acts as a mediator that provides the mobile unit with pre-collected information about neighboring access points. This intermediary approach allows the mobile unit to make informed roaming decisions without directly scanning all channels, thus reducing scanning time while maintaining reliable AP selection.
2Reliability
If the mobile unit performs comprehensive channel scanning during handoff, then it can identify the best access point for seamless roaming, but packet loss occurs during the transition period
Solution Approach 1:
The system performs preliminary actions by pre-gathering and caching information about neighboring access points including their operational status, channel assignments, and signal quality metrics. This allows the mobile unit to identify the target AP before disconnecting from the current AP, enabling seamless handoff without packet loss.
Solution Approach 2:
The patent applies the skipping principle by allowing the mobile unit to bypass the traditional scanning process entirely. Using pre-collected information from the current AP, the mobile unit can directly associate with the target AP, rushing through the handoff process before data loss can occur.
3Reliability
If the mobile unit scans multiple channels to ensure optimal connection during roaming, then connection quality is maintained, but the complexity of the roaming process increases
Solution Approach 1:
The current access point serves as an intermediary that performs the complex task of gathering and analyzing information about neighboring APs. The mobile unit simply receives this pre-processed information and makes the association decision, significantly reducing the complexity burden on the mobile device while maintaining connection quality.
Solution Approach 2:
The current access point performs multiple functions: it serves as a communication endpoint for the mobile unit, a information broker about neighboring APs, and a guide for roaming decisions. This multi-functionality consolidates the complexity into a single entity rather than requiring the mobile unit to perform all these functions.
Data Source
AI summary
Described are systems, methods, and devices used for reducing scanning time while communicating between wireless mobile computing devices within a wireless communications network. The method includes the following step(s): receiving communication data from one or more APs within a network, the communication data being specific to each of the one or more APs and transmitting the communication data to an MU within the network. The MU is associated with a first AP and the MU associates with a second AP based on the communication data as the MU roams to the second AP. The method further includes the steps of: associating, by an MU, with a first AP within a network, receiving communication data from the first AP, the communication data including information specific to each of one or more further APs, and associating with one of the further APs based on the communication data.