Wireless load balancing

• US 8,064,939 B2
• Filed: 06/24/2009
• Issued: 11/22/2011
• Est. Priority Date: 06/01/2006
• Status: Active Grant

• Current Assignee: Trapeze Networks Incorporated (Juniper Networks Incorporated)
• Original Assignee: Juniper Networks Incorporated
• Inventors: Matta, Sudheer Poorna Chandra
• Primary Examiner(s): Ferguson; Keith
• Application Number:
  US12/491,201
• Publication Number:
  US 20090323531A1
• Time in Patent Office: 881 Days
• Field of Search: 455/509, 455/500, 455/501, 455/450, 455/453, 455/550.1, 455/552.1, 455/422.1, 455/403, 455/426.1, 455/426.2, 455/434, 455/515, 370/310, 370/328, 370/329, 370/343
• US Class Current: 455/509
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/125 by balancing the load, e.g. traffic engineering
• CPC Class Codes: H04W 28/0231 based on communication conditions dynamic wireless traffic scheduling definition based on channel quality criteria H04W72/54
• CPC Class Codes: H04W 28/0289 Congestion control load shedding arrangements in network planning H04W16/08; performing reselection for handling the traffic H04W36/22; wireless traffic scheduling H04W72/12
• CPC Class Codes: H04W 28/082 among bearers or channels
• CPC Class Codes: H04W 28/0958 based on metrics or performance parameters
• CPC Class Codes: H04W 8/04 Registration at HLR or HSS [Home Subscriber Server]

Abstract

A technique for wireless load balancing involves providing a wireless infrastructure that creates a target band option and helps push clients toward that band. An example of a method according to the technique involves, by way of example but not limitation, responding only to probe requests on a first band when a client is detected on the first band and a second band. For example, using the techniques described herein, a platform that is both 802.11a and 802.11b/g compliant may attempt to connect preferentially to the 802.11b/g band of a wireless network, and be migrated toward the 802.11a band instead.

Claims

1. A method comprising:

receiving, from a wireless device, a first probe request on a first band and a second probe request on each of a plurality of other bands;

determining that a received strength signal indicator (RSSI) on the first band is greater than a signal threshold, where the signal threshold is based on a highest RSSI value of one of the plurality of other bands;

responding, based on the determining, to the first probe request on the first band; and

refusing to respond, based on the determining, to each of the second probe requests on each of the plurality of other bands, where responding to the first probe request and refusing to respond to the second probe requests creates an impression, at the wireless device, that a service set identifier (SSID) is unavailable on each of the plurality of other bands.

2. The method of claim 1, further comprising:

connecting the wireless device to a wireless network on the first band; and

connecting the wireless device to a wireless network on the one of the plurality of other bands when the RSSI on the first band is below the signal threshold.

3. The method of claim 1, further comprising:

connecting the wireless device to a wireless network on the first band after creating the impression at the wireless device that the SSID is unavailable on each of the plurality of other bands.

4. The method of claim 1, where refusing to respond to each of the second probe requests is further based on an amount of traffic on each of the plurality of other bands.

5. The method of claim 1, where refusing to respond to each of the second probe requests is further based on a load balance across the first band and each of the plurality of other bands.

6. The method of claim 1, further comprising:

determining that the first band is a target band using available data, where the available data includes an access point occupancy associated with the first band and each of the plurality of other bands.

7. The method of claim 1, further comprising:

selecting the first band as a target band, and

where the responding to the first probe request is further based on the selecting the first band as the target band.

8. The method of claim 7, where the selecting the first band further comprises:

receiving user input designating the first band as the target band.

9. A method comprising:

setting an approximately 5 GHz spectrum band as a target band;

determining that a particular client, of a plurality of clients, is compatible with the target band and that another client, of the plurality of clients, is not compatible with the target band;

migrating, based on the determining, the particular client that is compatible with the target band from an approximately 2.4 GHz spectrum band to the target band when a first detected signal strength, associated with the particular client, exceeds a received strength signal indicator (RSSI) threshold; and

switching the particular client back to the approximately 2.4 GHz spectrum band when a second detected signal strength, associated with the particular client, drops below the RSSI threshold.

10. The method of claim 9, further comprising:

selecting another spectrum band as the target band;

detecting a third signal strength associated with the particular client; and

migrating, based on the detected third detected signal strength, the particular client from the approximately 2.4 GHz spectrum band to the other spectrum band.

11. The method of claim 9, further comprising:

determining that a third client, of the plurality of clients, is compatible with the target band; and

migrating, based on determining that the third client is compatible with the target band, the third client from another band to the target band.

12. The method of claim 9, further comprising:

determining whether each of the plurality of clients are compatible with the target band; and

migrating each of the plurality of clients that are determined to be compatible with the target band from the approximately 2.4 GHz spectrum band to the target band, where at least the other client, of the plurality of clients, is determined not to be compatible with the target band and remains connected to the 2.4 GHz spectrum band.

13. The method of claim 9, further comprising:

disabling the migrating and the switching back based upon network traffic characteristics.

14. The method of claim 9, where the approximately 5 GHz spectrum band is an 802.11b/g band.

15. The method of claim 9, where the approximately 2.4 GHz spectrum band is an 802.11a band.