Wireless load balancing across bands

• US 8,320,949 B2
• Filed: 10/13/2011
• Issued: 11/27/2012
• Est. Priority Date: 06/01/2006
• Status: Active Grant

• Current Assignee: Juniper Networks Incorporated
• Original Assignee: Juniper Networks Incorporated
• Inventors: Matta, Sudheer Poorna Chandra
• Primary Examiner(s): Ferguson, Keith
• Application Number:
  US13/272,859
• Publication Number:
  US 20120034943A1
• Time in Patent Office: 411 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, by a network device and from a wireless device, a first request via a first wireless band and a second request via a second wireless band;

detecting, by the network device, a first network condition associated with the first wireless band and a second network condition associated with the second wireless band based on the first request and the second request;

selecting, by the network device and based on the first network condition and the second network condition, the first wireless band for connecting the wireless device to a wireless network;

sending, by the network device, a signal, responsive to the first request, to the wireless device on the first wireless band; and

determining not to send a signal, responsive to the second request, to the wireless device on the second wireless band,

sending the signal on the first wireless band and determining not to send the signal on the second wireless band causing the wireless device to determine that the second wireless band is not available for connecting the wireless device to the wireless network.

2. The method of claim 1, where selecting the first wireless band includes:

determining, based on the first network condition and the second network condition, that the wireless device is capable of connecting to the wireless network via the first wireless band and the second wireless band, and

selecting the first wireless band is further based on the wireless device being capable of connecting to the wireless network via the first wireless band and the second wireless band.

3. The method of claim 1, where the first network condition includes access point occupancy data associated with the first wireless band and the second network condition includes access point occupancy data associated with the second wireless band, and

where selecting the first wireless band includes:

selecting the first wireless band based on the access point occupancy data associated with the first wireless band and the access point occupancy data associated with the second wireless band.

4. The method of claim 1, further comprising:

receiving, from the wireless device and based on sending the signal to the wireless device on the first wireless band without sending the signal to the wireless device on the second wireless band, a response to the signal via the first wireless band, and

connecting, based on the response, the wireless device to the wireless network via the first wireless band.

5. The method of claim 1, further comprising:

determining that another wireless device is able to connect to the wireless network via only the first wireless band, and

migrating the wireless device from the first wireless band to the second wireless band based on the other wireless device being able to connect to the wireless network via only the first wireless band.

6. The method of claim 1, where detecting the first network condition and the second network condition includes:

determining a signal strength of communications associated with the wireless device on the first wireless band and another signal strength of communications associated with the wireless device on the second wireless band, and

where sending the signal to the wireless device on the first wireless band is based on the signal strength and the other signal strength.

7. The method of claim 6, further comprising:

determining, based on the other signal strength, a threshold signal strength, and

where detecting the first network condition and the second network condition further includes;

determining that the signal strength is greater than the threshold signal strength,

where sending the signal to the wireless device on the first wireless band is based on the signal strength being greater than the threshold signal strength.

8. A device comprising:

one or more processors to;

receive, from a wireless device, a first request to connect to a particular network, the first request being received via a first wireless band

receive, from the wireless device, a second request to connect to the particular network, the second request being received via a second wireless band that is different from the first wireless band,

detect network conditions associated with the first wireless band based on the first request,

detect network conditions associated with the second wireless band based on the second request,

select, based on the network conditions associated with the first wireless band and the network conditions associated with the second wireless band, the first wireless band for connecting the wireless device to the particular network,

send, to the wireless device and on the first wireless band, a first signal to the wireless device based on selecting the first wireless band, and

determine not to send a second signal on the second wireless band, not sending the second signal causing the wireless device to be unaware that the second wireless band is available for connecting to the particular network.

9. The device of claim 8, where, when selecting the first wireless band, the one or more processors are to:

determine that the wireless device is capable of connecting to the particular network via the first wireless band,

determine that the wireless device is capable of connecting to the particular network via the second wireless band, and

select the first wireless band further based on the wireless device being capable of connecting to the particular network via the first wireless band and being capable of connecting to the network via the second wireless band.

10. The device of claim 8, where the network conditions associated with the first wireless band include access point occupancy data associated with the first wireless band and the network conditions associated with the second wireless band include access point occupancy data associated with the second wireless band, and

when selecting the first wireless band, the one or more processors are to:

select the first wireless band based on the access point occupancy data associated with the first wireless band and the access point occupancy data associated with the second wireless band.

11. The device of claim 8, where the one or more processors are further to:

receive, based on sending the first signal on the first wireless band, a response to the first signal from the wireless device via the first wireless band, and

connect, based on the response, the wireless device to the particular network via the first wireless band.

12. The device of claim 8, where the one or more processors are further to:

determine that a second wireless device, that is connected to the particular network via the first wireless band, is able to connect to the particular network via the second wireless band,

determine not to respond to signals transmitted from the second wireless device via the first wireless band, and

respond to signals transmitted from the second wireless device via the second wireless band to migrate the second wireless device from the first wireless band to the second wireless.

13. The device of claim 8, where, when determining the network conditions associated with the first wireless band and the network conditions associated with the second wireless band, the one or more processors are further to:

determine a signal strength associated with the wireless device transmitting communications via the first wireless band and another signal strength associated with the wireless device transmitting communications via the second wireless band, and

where sending the first signal to the wireless device on the first wireless band is based on the signal strength and the other signal strength.

14. The device of claim 13, where, when determining the network conditions associated with the first wireless band and the network conditions associated with the second wireless band, the one or more processors are further to:

determine that the signal strength is greater than a threshold signal strength, and

where sending the first signal to the wireless device on the first wireless band is based on the signal strength being greater than the threshold signal strength.

15. A non-transitory computer-readable medium for storing instructions, the computer-readable medium comprising:

one or more instructions that, when executed by one or more processors, cause the one or more processors to;

detect network conditions on a first wireless band,

detect network conditions on a second wireless band, where the second wireless band is different from the first wireless band,

select, based on the network conditions on the first wireless band and the network conditions on the second wireless band, the first wireless band as a target band,

send a first signal to a wireless device on the target band and ignore communications transmitted by the wireless device on the second wireless band to cause the wireless device to connect to a wireless network via the target band; and

connect, based on sending the first signal to the wireless device on the target band and ignoring communications transmitted by the wireless device on the second wireless band, the wireless device to the wireless network on the target band.

16. The computer-readable medium of claim 15, where, the one or more instructions that, when executed by the one or more processors, cause the one or more processors to select the first wireless band as the target band, cause the one or more processors further to:

determine that the wireless device is capable of connecting to the wireless network on the first wireless band,

determine that the wireless device is capable of connecting to the wireless network on the second wireless band, and

select the first wireless band as the target band further based on the wireless device being capable of connecting to the wireless network on the first wireless band and the second wireless band.

17. The computer-readable medium of claim 15, where the one or more instructions that, when executed by the one or more processors, cause the one or more processors to select the first wireless band as the target band, cause the one or more processors further to:

select the first wireless band as the target band further based on access point occupancy data associated with the first wireless band and access point occupancy data associated with the second wireless band.

18. The computer-readable medium of claim 15, further comprising:

one or more instructions that, when executed by the one or more processors, cause the one or more processors to;

determine that a second wireless device, that is connected to the wireless network via the first wireless band, is able to connect to the wireless network via the second wireless band, and

migrate the second wireless device from the first wireless band to the second wireless band based on sending the first signal to the wireless device on the target band.

19. The computer-readable medium of claim 15, further comprising:

one or more instructions that, when executed by the one or more processors, cause the one or more processors to;

determine a signal strength associated with the wireless device transmitting a signal on the first wireless band and another signal strength associated with the wireless device transmitting a signal on the second wireless band,

where the first wireless band is selected as the target band based on the signal strength and the other signal strength.

20. The computer-readable medium of claim 19, further comprising:

one or more instructions that, when executed by the one or more processors, cause the one or more processors to;

determine a threshold signal strength based on the other signal strength, and

determine that the signal strength is greater than the threshold signal strength,

where sending the first signal to the wireless device on the target band is further based on the signal strength being greater than the threshold signal strength.