Selective handoff between access gateways

1. A method for providing access by a user device of a network service comprising:

sending an initiation signal from the user device to a session initialization proxy server;

initiating an application on the user device that requires the network service;

sending quality of service parameters for the user device and the application from the session initialization proxy server to a policy function server;

sending a resource allocation request from the policy function server to a first access gateway;

in response to the resource allocation request, providing the network service to the user device in accordance with the quality of service parameters via the first access gateway;

monitoring, by the user device, the first access gateway to determine if the first access gateway can continue to provide the network service in accordance with the quality of service parameters comprising an indicator of a media type for a session associated with the network service;

if the first access gateway can no longer provide the network service in accordance with the quality of service parameters, the user device determining a second access gateway that can provide the network service according to the quality of service parameters;

providing the network service to the user device via a link between the first access gateway and the second access gateway;

establishing communication between the second access gateway and the user device;

automatically providing the network service to the user device via the second access gateway when communication between the user device and the second access gateway has been established; and

closing the link between the first access gateway and the second access gateway.

2. A method for providing access by a user device of a network service as in claim 1 further comprising monitoring available network resources available for the network service and selecting the network on which to establish the network service based on the available network resources.

3. A method for providing access by a user device of a network service as in claim 1 wherein the network service is provided over a wireless network.

4. A method for providing access by a user device of a network service as in claim 1 wherein the first access gateway controls access to a network using a first technology and the second access gateway controls access to a network using a second technology.

5. A method for providing access by a user device of a network service as in claim 4 wherein the first technology is a wireless cellular network and the second technology is WiFi network.

6. A system for providing access by a user of a network service comprising:

a user device configured to send an initiation signal from the user device to a session initialization proxy server, configured to initiate an application on the user device that requires the network service;

the session initialization proxy server configured to send quality of service parameters for the user device and the application from the session initialization proxy server to a policy function server;

the policy function server configured to send a resource allocation request from the policy function server to a first access gateway;

the first access gateway configured to provide the network service to the user device in accordance with the quality of service parameters via the first access gateway, in response to the resource allocation request;

the user device configured to determine if the first access gateway can continue to provide the network service in accordance with the quality of service parameters comprising an indicator of a media type for a session associated with the network service, and, if the first access gateway can no longer provide the network service in accordance with the quality of service parameters, the user device determining a second access gateway that can provide the network service according to the quality of service parameters;

the second access gateway configured to provide the network service to the user device via a link between the first access gateway and the second access gateway, configured to establish communication between the second access gateway and the user device, configured to automatically provide the network service to the user device via the second access gateway when communication between the user device and the second access gateway has been established, and configured to close the link between the first access gateway and the second access gateway when provision of the network service by the second access gateway has been established.

7. A system as in claim 6 wherein the user device is further configured to monitor available network resources available for the network service and selecting the network on which to establish the network service based on the available network resources.

8. A system as in claim 6 wherein the network service is provided over a wireless network.

9. A system as in claim 6 wherein the first access gateway is configured to control access to a network using a first technology and the second access gateway is configured to control access to a network using a second technology.

10. A system as in claim 9 wherein the first technology is a wireless cellular network and the second technology is WiFi network.