METHOD AND APPARATUS FOR USE OF SIMULTANEOUS MULTIPLE CHANNELS IN THE DYNAMIC FREQUENCY SELECTION BAND IN WIRELESS NETWORKS

• US 20180035457A1
• Filed: 10/11/2017
• Published: 02/01/2018
• Est. Priority Date: 08/04/2015
• Status: Active Grant

• Current Assignee: Chengdu Sk Spruce Technologies Co., Ltd.
• Original Assignee: Network Performance Research Group LLC
• Inventors: Ngo, Terry F K, Yi, Seung Baek, Kurniawan, Erick, Tsai, Kun Ting
• Granted Patent: US 10,448,424 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 17/30 of propagation channels
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 74/006 in the downlink, i.e. towards the terminal
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

The present invention relates to wireless networks and more specifically to systems and methods for selecting available channels free of radar signals from a plurality of 5 GHz radio frequency channels. In one embodiment, the present invention provides a standalone multi-channel DFS master that includes a switch and embedded processor that are programmed to switch a 5 GHz radio transceiver to a first channel of the plurality of 5 GHz radio channels, cause a beacon generator to generate a beacon in the first channel of the plurality of 5 GHz radio channels, cause a radar detector to scan for the radar signal in the first channel of the plurality of 5 GHz radio channel, and then repeat these steps for each of the other channels of the plurality of 5 GHz radio channels during a single beacon transmission duty cycle.

Claims

1. A multi-channel Dynamic Frequency Selection (DFS) master comprising:

a beacon generator programmed to generate a channel-specific beacon in each of a plurality of 5 GHz radio channels;

a radar detector programmed to scan for radar in each of the plurality of 5 GHz radio channels;

a 5 GHz radio transceiver coupled to the beacon generator and the radar detector and programmed to transmit the channel-specific beacon in each of the plurality of 5 GHz radio channels and to receive the radar in each of the plurality of 5 GHz radio channels; and

a switch and an embedded processor coupled to the radar detector, the beacon generator, and the 5 GHz radio transceiver, programmed to perform the following steps on each of the plurality of 5 GHz radio channels;

(a) switch the 5 GHz radio transceiver to one of the plurality of 5 GHz radio channels;

(b) cause the radar detector to scan for the radar in the one of the plurality of 5 GHz radio channels;

(c) cause the beacon generator to generate the channel-specific beacon for the one of the plurality of 5 GHz radio channels; and

(d) repeat steps (a) through (c) for each other channel of the plurality of 5 GHz radio channels;

wherein steps (a) through (d) are performed during (1) a beacon transmission duty cycle which is a time period between successive beacon transmissions on a specific 5 GHz channel and which is less than or equal to the maximum time period between the successive beacon transmissions allowable for a client device to remain associated with the specific 5 GHz channel and (2) during a radar detection duty cycle which is the time period between successive radar scans on the specific 5 GHz channel.

2. The standalone multi-channel DFS master of claim Error! Reference source not found. further comprising memory to store a whitelist of each of the plurality of 5 GHz radio channels that does not contain the radar and a blacklist of each of the plurality of 5 GHz radio channels that contains the radar.

3. The standalone multi-channel DFS master of claim 2 further comprising a wired network interface connected to an access point host or the LTE-U host wherein the standalone multi-channel DFS master is programmed to communicate the whitelist and blacklist to a cloud intelligence engine via the access point host or the LTE-U host, receive control information from the cloud intelligence engine via the access point host or the LTE-U host, and to transmit the control information to the access point host or the LTE-U host.

4. The standalone multi-channel DFS master of claim 3 wherein the control information transmitted to the access point host or the LTE-U host controls an operating channel selection of the access point host or the LTE-U host.

5. The standalone multi-channel DFS master of claim 2 further comprising a non-DFS radio transceiver wherein the standalone multi-channel DFS master is programmed to communicate the whitelist and blacklist with the non-DFS radio transceiver.

6. The standalone multi-channel DFS master of claim 5 wherein the non-DFS radio transceiver is selected from the group consisting of a 2.4 GHz radio transceiver, a Bluetooth transceiver, and an 802.15.4 transceiver.