| 摘要 |
Embodiments of the invention include providing access by a user device of a network service including: sending an initiation signal to a SIP proxy server, initiating an application on the user device, sending QoS parameters for the user device and the application to a policy function server, sending a resource allocation request to a first access gateway, providing the network service in accordance with the QoS parameters, if the first access gateway can no longer provide the network service in accordance with the QoS parameters, determining a second access gateway that can provide the network service according to the QoS parameters, providing the network service to the user device via a link between the first and second access gateways, 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.
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