Extended Range Wireless Beaconing for Network Discoverability
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Solution Overview
Problem
Current wireless networking technologies face challenges in extending communication range, particularly in areas with poor propagation conditions, where devices struggle to detect legacy beacons due to distance or interference, leading to unreliable connections.
Innovation Solution
Implementing extended range beacons and active scanning mechanisms, where access points transmit both legacy and extended range beacons, allowing stations to use active scanning to discover networks, and enabling the use of extended range probe requests to facilitate connections beyond the normal range, with the ability to switch between beaconing modes based on discoverability needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If extended range beacons are transmitted less frequently than legacy beacons, then power consumption is reduced, but network discoverability in extended range areas deteriorates
Solution Approach 1:
The access point dynamically adjusts beacon transmission frequency based on operational phase: during initial network formation, extended range beacons are transmitted more frequently to ensure discoverability, then the frequency is reduced to a lower rate for power savings during stable operation. This dynamic adjustment resolves the contradiction between power consumption and network discoverability.
Solution Approach 2:
Extended range beacons are transmitted in advance during the network formation phase to ensure stations in extended range areas can discover the network before normal operation begins. This preliminary action ensures discoverability is established upfront, allowing subsequent power-saving mode to be used without compromising network availability.
2Reliability
If extended range beacons are transmitted, then network discoverability in extended range areas is improved, but transmission time and overhead increase
Solution Approach 1:
Extended range beacons are transmitted periodically at reduced frequency rather than continuously, with the period adjusted based on operational phase. This periodic transmission maintains network discoverability while significantly reducing total transmission time and overhead compared to continuous transmission.
Solution Approach 2:
The beacon transmission is segmented into two phases: an initial formation phase with higher frequency extended range beacon transmission for discoverability, and a stable operation phase with reduced frequency transmission for efficiency. This segmentation allows the system to achieve discoverability without continuous high-overhead transmission.
3Productivity
If legacy beacons with shorter preamble are used, then transmission efficiency is improved, but discoverability in poor propagation conditions deteriorates
Solution Approach 1:
The system uses different beacon types with different properties for different purposes: extended range beacons with longer preambles and higher power are used specifically for discoverability in poor propagation conditions and extended range areas, while legacy beacons with shorter preambles are used for normal efficient operation. This local quality differentiation resolves the contradiction by applying the right beacon type in the right context.
Solution Approach 2:
The access point dynamically switches between transmitting extended range beacons and legacy beacons based on operational phase and detected propagation conditions. During initial formation or in poor propagation conditions, extended range beacons are used; during stable operation in good conditions, legacy beacons are used for efficiency.
Data Source
AI summary
Passive and active scanning for extended range wireless networking. The choice between legacy and extended range signaling can depend on one or more factors. For passive scanning, an electronic device may transmit a combination of legacy beacons and extended range beacons for network discovery by receiving electronic devices. For active scanning, an electronic device may transmit extended range probe requests in addition to legacy probe requests to discover all of the access points within its transmission range. Responses to probe requests can use extended range, legacy, single user, and/or multi user protocols.