Abstract: A telecommunications system has a protocol architecture over an interface between nodes of the telecommunications system, the protocol architecture including Internet Protocol as a protocol above a link layer protocol in a transport network layer. The protocol architecture can be used over one or more of several interfaces, including the interface between a radio access network and a core network [Iu Interface]; the interface between radio network controllers (RNCs) and the base stations (BSs) served thereby [Iub Interface]; and the interface between a Source RNC (SRNC) and a Drift RNC (DRNC) [Iur Interface]. A new XTP Protocol is proposed as another aspect of the invention, which is usable in a protocol stack for the Iu-PS (packet switched) implementation as well as over the Iu-CS, Iub, and Iur Interfaces.

Abstract: A method of alerting a mobile wireless subscriber (11) registered with a mobile wireless communication network (1) to a session initiation request sent by a calling party (7). The method comprises receiving a SIP Invite message at a Home SIP server (8) of the mobile network (1), the SIP Invite message containing a SIP URL identifying said mobile subscriber (11). Using the SIP URL, the identity of a ACP (3) with which the mobile subscriber (11) is currently registered is identified and a paging message broadcast to said mobile subscriber (11) from said ACP (3).

Abstract: A method of authorizing an Internet Protocol (IP) enabled mobile host 1 to access the Internet 2 via an wireless LAN, GSM, UMTS access network 3 comprises initially sending an IP access request from the mobile host 1 to an IP router 5 within the access network 3. In response to receipt of said access request at the IP router 5, an IP address routing prefix is sent from the IP router 5 to the mobile host 1. Electronic cash is then forwarded from the mobile host 1 to a control point 6 within the access network 3. The control point 6 confirms the authenticity and/or sufficiency of the electronic cash and, providing that confirmation is made, sends an authorization message to the IP router 5. The IP router 5 blocks the transmission of IP packets between the mobile host 1 and the Internet 2 prior to receipt of the authorization message and permits the passage of IP packets only after an authorization message has been received.

Abstract: A method of allocating an Internet Protocol (IP) address to a mobile wireless terminal within a mobile telecommunications network. During the establishment of the radio link between the terminal and the network, a negotiation is conducted to provide the mobile terminal with a host part for an IP address, where the host part is unique within the radio network. In the case of a UMTS network, the host part is the Radio Network Terminal Identity (RNTI).

Abstract: A telecommunications system has a protocol architecture over an interface between nodes of the telecommunications system, the protocol architecture including Internet Protocol as a protocol above a link layer protocol in a transport network layer. The protocol architecture can be used over one or more of several interfaces, including the interface between a radio access network and a core network [Iu Interface]; the interface between radio network controllers (RNCs) and the base stations (BSs) served thereby [Iub Interface]; and the interface between a Source RNC (SRNC) and a Drift RNC (DRNC) [Iub Interface]. A new XTP Protocol is proposed as another aspect of the invention, which is usable in a protocol stack for the Iu-PS (packet switched) implementation as well as over the Iu-CS, Iub, and Iur Interfaces.

Abstract: A method of allocating an Internet Protocol (IP) address to a mobile wireless terminal 7 within a mobile telecommunications network. The network repeatedly broadcasts, over a radio broadcast channel of the network, a routing prefix corresponding to the Radio Network Controller (RNC) ID. Mobile terminals 7 listen to the broadcast channel, either when registering with the network or subsequently thereto, to determine the routing prefix. A mobile terminal 7 combines the routing prefix with a host port to generate an IP address for subsequent Internet sessions.

Abstract: A method of authenticating a mobile wireless terminal 9 in a mobile telecommunications network, the terminal 9 being a subscriber of an Internet Service Provider (ISP) 11 rather than of a mobile network. The terminal 9 is allocated an International Mobile Identity (IMI) which is transmitted from the terminal 9 to a mobile network when the terminal 9 wishes to register with the network. A country code part and an operator ID part of the IMI are used by the network to determine the Internet Protocol (IP) address of the terminal's home ISP 11, which is then contacted by the network over the Internet to authenticate the mobile terminal 9.

Abstract: A method of alerting a mobile wireless subscriber (11) registered with a mobile wireless communication network (1) to a session initiation request sent by a calling party (7). The method comprises receiving a SIP Invite message at a Home SIP server (8) of the mobile network (1), the SIP Invite message containing a SIP URL identifying said mobile subscriber (11). Using the SIP URL, the identity of a ACP (3) with which the mobile subscriber (11) is currently registered is identified and a paging message broadcast to said mobile subscriber (11) from said ACP (3).