Wireless hand-over in mobile deployments

• US 8,213,388 B2
• Filed: 03/31/2008
• Issued: 07/03/2012
• Est. Priority Date: 03/31/2008
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Pathan, Arnavkumar M., Kruys, Johannes Petrus, Feige, Gaetan
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): Elallam, Ahmed
• Application Number:
  US12/060,184
• Publication Number:
  US 20090245199A1
• Time in Patent Office: 1,555 Days
• Field of Search: 370328-332, 370/338, 455/436, 455/437, 455/439, 455/440, 455/442, 455/443, 455/456.1
• US Class Current: 370/332
• CPC Class Codes: H04W 28/26 Resource reservation
• CPC Class Codes: H04W 36/32 by location or mobility data, e.g. speed data
• CPC Class Codes: H04W 36/322 by location data

Abstract

The network communication system includes a wireless interface to exchange wireless signals during at least one network connection, and a handover controller that uses a route profile identifying access points distributed over a given route or region that are capable of supporting the network connection, and to handover the network connection between access points as the device travels along the given route or through a region according to the route profile.

Claims

1. A device comprising:

a wireless interface to exchange wireless signals with a first access point of multiple access points in at least one network connection; and

a handover controller to utilize a route profile configured to identify locations of the multiple access points distributed over a route that are capable of supporting the network connection, where the handover controller is configured to monitor signal strength of wireless signals from the multiple access points, and to determine whether to handover the network connection to a second access point of the multiple access points based, at least in part, on the monitored signal strength of the wireless signals from the first and second access points and the route profile as the device travels along the route, and where the handover controller is configured to identify expected signal strength fluctuations proximate to the first access point based on the route profile, and to maintain an association with the first access point as the device passes through the signal strength fluctuations.

2. The device of claim 1 where the route profile includes a route map configured to identify locations of the access points along the predetermined route and characteristics of the access points including a number of packet-switched hops from the access points to a network backbone.

3. The device of claim 2 where the handover controller is configured to handover the network connection between access points based on the route map and the monitored signal strength of the wireless signals from the plurality of the access points.

4. The device of claim 1 where the handover controller is configured to compare the monitored signal strength of the wireless signals to a threshold value, and to determine a proximity of the handover controller to the first access point based on the comparison.

5. The device of claim 4 where the handover controller is configured to invoke a hysteresis timer based on the proximity of the handover controller to the first access point, the hysteresis timer to indicate to the handover controller an availability to handover the network connection to the second access point.

6. The device of claim 1 where the handover controller is configured to determine a location of the device relative to the access points identified in the route profile, and to handover the network connection to between the first and second access points based on the location of the device relative to the access points identified in the route profile.

7. A method comprising:

utilizing, with a networking device, a route profile to identify access points distributed over a route that are capable of supporting a network connection, and to identify expected signal strength fluctuations proximate to a first access point currently supporting the network connection;

monitoring, with the networking device, signal strength of wireless signals from the access points;

determining, with the networking device, whether to handover the network connection to a second access point from the first access point based, at least in part, on the monitored signal strength of the wireless signals from the access points and the route profile; and

maintaining, with the networking device, an association with the first access point as the networking device passes through the signal strength fluctuations based on the determination.

8. The method of claim 7 includes accessing a route map in the route profile to identify locations of the access points along the route and characteristics of the access points including a number of packet-switched hops from the access points to a network backbone.

9. The method of claim 7 includes:

comparing, with the networking device, the monitored signal strength of the wireless signals to a threshold value; and

determining, with the networking device, a proximity of the networking device to the first access point based on the comparison.

10. The method of claim 9 includes invoking a hysteresis timer with the networking device based on the proximity of the networking to the first access point, the hysteresis timer to indicate to the networking device an availability to handover the network connection to the second access point.

11. The method of claim 7 includes

determining the location of the networking device utilizing the network connection relative to the access points;

and

handing-over the network connection to between the first and second access points based on the location of the networking device relative to the access point.

12. An apparatus comprising:

means for utilizing a route profile to identify access points distributed over a route that are capable of supporting a network connection, and to identify expected signal strength fluctuations proximate to a first access point currently supporting the network connection;

means for monitoring signal strength of wireless signals from the access points;

means for determining whether to handover the network connection to a second access point from the first access point based, at least in part, on the monitored signal strength of the wireless signals from the access points and the route profile as the apparatus travels along the route; and

means for maintaining an association with the first access point as the apparatus passes through the signal strength fluctuations based on the determination.

13. The apparatus of claim 12 where the means for utilizing the route profile is configured to access a route map in the route profile to identify locations of the access points along the route and characteristics of the access points including a number of packet-switched hops from the access points to a network backbone.

14. The apparatus of claim 12 where the means for determining whether to handover the network connection is configured to compare the monitored signal strength of the wireless signals to a threshold value, and determine a proximity of the networking device to the first access point based on the comparison.

15. The apparatus of claim 14 where the means for determining whether to handover the network connection is configured to invoke the means for maintaining based on the proximity of the apparatus to the first access point.

16. The apparatus of claim 12 where the means for determining whether to handover the network connection is configured to determine the location of the apparatus utilizing the network connection relative to the access points and is configured to handover the network connection to between the first and second access points based on the location of the apparatus relative to the access point.