Patent ID: 7324529
Filing Date: 2008-01-29
Classification: H04L,H04W

Abstract:
1. Method for transmitting packets along a first IP network via a cellular radio communication system having equipment connected between them through the intermediary of a second IP network, the equipment comprising at least a gateway router having a first interface for exchanging first packets along the first IP network and a second interface for exchanging second packets along the second IP network, and at least a switching node having a first interface with a radio access network providing links with radio terminals and a second interface for exchanging at least some of the second packets along the second IP network, wherein at least some of the radio terminals include means of communication along the first IP network via the cellular system, the gateway router forming, in the first IP network, an edge router which exchanges at least some of the first packets with the terminals in a single hop of the first IP network, each of the first packets exchanged being encapsulated in at least one data unit of a tunnel protocol implemented between the second interfaces of the gateway router and the switching node, the data unit including a tunnel identity and itself being encapsulated in at least one second packet, the method comprising the following steps: detecting first signalling packets carrying RESV messages of an RSVP protocol concerning a first RSVP session in the first IP network relative to an application flow of at least some of the first packets between a radio terminal and a remote unit connected to the first IP network; in response to the detection of at least some of the first signalling packets, associating a second RSVP session in the second IP network with the tunnel identity included in the data units in which the first packets of the application flow are encapsulated, the second session being relative to a flow of at least some of the second packets in which the data units are encapsulated between the gateway router and the switching node; and transmitting second signalling packets in the second IP network for establishing and/or updating parameters of the second session associated with the tunnel identity.