Controlling Channel Usage In A Wireless Network

Patent No. US11246016 (titled "Controlling Channel Usage In A Wireless Network") was filed by Estelgia Llc on Feb 14, 2020.

’016 is related to the field of wireless networking, specifically to systems employing multiple access points (APs) to extend coverage. Traditional Wi-Fi networks often struggle with interference and suboptimal channel selection, especially in environments with numerous devices competing for bandwidth. Range extenders and repeaters offer a partial solution, but can introduce their own set of problems related to channel congestion and inefficient resource allocation.

The underlying idea behind ’016 is to dynamically optimize channel usage in a multi-AP Wi-Fi system by intelligently monitoring and reacting to interference. The system uses a dedicated backhaul channel for communication between the AP and satellite nodes, while client devices connect via a fronthaul channel . By independently assessing interference on both backhaul and fronthaul channels, and then coordinating channel switching, the system aims to maximize bandwidth and minimize disruptions.

The claims of ’016 focus on a method, system, and non-transitory computer readable medium for dynamically switching fronthaul channels based on interference characteristics. Specifically, the system identifies a backhaul channel between an AP and a satellite, and a fronthaul channel between a client and either the AP or satellite. It then receives data about interference characteristics at either the AP or satellite, and based on this data, determines to switch the fronthaul channel. Finally, it sends a message to the client device, instructing it to switch to the new fronthaul channel.

In practice, the system involves each AP and satellite node independently scanning available wireless channels to characterize interference. This characterization can include measuring signal strength (RSSI), identifying other Wi-Fi networks, or detecting non-Wi-Fi interference sources like baby monitors or microwave ovens. The nodes then exchange this interference information over the backhaul channel, allowing the system to build a comprehensive view of the wireless environment. Based on this view, the system can then select the least congested fronthaul channel for each client device.

This approach differentiates itself from static channel selection methods by continuously adapting to changing conditions. Unlike traditional systems that might rely on a single AP to make channel decisions, ’016 leverages the distributed sensing capabilities of multiple nodes to create a more robust and responsive system. By coordinating channel switching across the network, the system can avoid scenarios where multiple devices are competing for the same limited resources, leading to improved overall network performance and a better user experience. The use of a dedicated backhaul further isolates control traffic from client data, ensuring reliable communication even under heavy load.

How does this patent fit in bigger picture?

Technical landscape at the time

In the mid-2010s when ’016 was filed, wireless networking systems commonly relied on multiple frequency bands to provide network access. At a time when extending network coverage was typically implemented using repeaters, interference management and channel selection were non-trivial, especially in multi-band systems where devices could communicate on different channels for backhaul and fronthaul operations.

Novelty and Inventive Step

The examiner approved the application because the claims overcome prior art related to coordinated multiple-access point systems. While prior art taught optimizing fronthaul and backhaul links to avoid RF interference by changing channels, it did not disclose a client Wi-Fi device switching from one fronthaul channel to another based on interference data from access points or satellite Wi-Fi devices using a backhaul channel for communication. The prior art also failed to teach using a third communication channel as a fronthaul channel based on interference data received via a backhaul channel.

Claims

This patent contains 20 claims, with independent claims numbered 1, 13, and 17. The independent claims are directed to a method, a system, and a non-transitory computer readable medium, respectively, all generally focused on managing communication channels (backhaul and fronthaul) between Wi-Fi devices based on interference characteristics. The dependent claims generally elaborate on and refine the elements and steps recited in the independent claims.

Key Claim Terms New

Definitions of key terms used in the patent claims.

Term (Source)	Support for Specification	Interpretation
Ap Wi-fi device (Claim 1, Claim 13, Claim 17)	“In some embodiments, at least one of the wireless networking devices is connected to the Internet and serves as a router (also referred to as “base” or an “Access Point”). The remaining wireless networking device(s) serve as satellite(s) that are wirelessly connected to the router via a dedicated or primary wireless channel or band.”	A Wi-Fi device that communicates with a satellite Wi-Fi device via a backhaul channel.
Backhaul channel (Claim 1, Claim 13, Claim 17)	“In some embodiments, at boot up a router configures the wireless network and begins communicating with a satellite via a first channel, which is a backhaul channel. The satellite begins communicating with a client via a second channel, which is a fronthaul channel. The backhaul channel of this example is capable of higher bandwidth communication than the fronthaul channel. A backhaul channel can comprise one or more channels of a wireless band, such as a 5 GHz high band channel, 60 Ghz channel, or a millimeter wave channel, and a fronthaul channel can comprise one or more channels of another band or bands, such as 5 Ghz low band or 2.4 Ghz band.”	A communication channel used for communication between an AP Wi-Fi device and a satellite Wi-Fi device.
Fronthaul channel (Claim 1, Claim 13, Claim 17)	“In some embodiments, at boot up a router configures the wireless network and begins communicating with a satellite via a first channel, which is a backhaul channel. The satellite begins communicating with a client via a second channel, which is a fronthaul channel. The backhaul channel of this example is capable of higher bandwidth communication than the fronthaul channel. A backhaul channel can comprise one or more channels of a wireless band, such as a 5 GHz high band channel, 60 Ghz channel, or a millimeter wave channel, and a fronthaul channel can comprise one or more channels of another band or bands, such as 5 Ghz low band or 2.4 Ghz band.”	A communication channel used for communication between a client Wi-Fi device and either the AP Wi-Fi device or the satellite Wi-Fi device.
Interference characteristics (Claim 1, Claim 13, Claim 17)	“As the various devices are communicating, the wireless communication channels experience interference. The router and the satellite each scan the various wireless communication channels and characterize the observed interference characteristics. The router determines from the interference characteristics of the first channel that a wireless networking device of another network is broadcasting on the first channel, while the satellite observes a clear channel on the first channel.”	Properties of interference observed on wireless communication channels.
Satellite Wi-fi device (Claim 1, Claim 13, Claim 17)	“The remaining wireless networking device(s) serve as satellite(s) that are wirelessly connected to the router via a dedicated or primary wireless channel or band. One example of the multi-band wireless networking system is the NETGEAR® Orbi® system.”	A Wi-Fi device that wirelessly connects to an AP Wi-Fi device via a backhaul channel.

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US11246016

ESTELGIA LLC

Application Number: US16791782
Filing Date: Feb 14, 2020
Status: Granted
Expiry Date: Dec 19, 2037
External Links: Slate, USPTO, Google Patents

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