Abstract: In the GPRS when a MS moves from a former routing area to a new routing area, a method of supporting mobile Internet protocol characterized in that on receipt of a routing area update message from the MS, a mobile Internet protocol agent advertisement is sent only to that MS. The move may be inter-SGN or intra-SGN or may involve a change of RNC. The method allows efficient use of radio resources.

Abstract: A telecommunication system including a mobile station, and means for a mobile station to receive voice-over Internet Protocol (VoIP) calls when it is roaming away from a home network, comprising: means for informing a serving GGSN of the International Mobile subscriber Identity (IMSI) of the called mobile station, and means for enabling a local VoIP control server to map a called MSISDN number to the IMSI number.

Abstract: A mobile telephone system is provided with a new architecture for dealing with voice internet protocol traffic. Real time traffic from mobile stations (22) is routed by a public land mobile telephone network internet protocol core (20) directly to one of two media gateways (28,32) respectively serving a plain switched telecommunication network/integrated services digital network (26) and an internet protocol backbone (30) without passing through the usual general packet radio system (GPRS) specific gateway.

Abstract: A mobile telephone network provides a network operator domain in which the output from a radio network controller (RAN) is processed by a voice capable serving GPRS support mode (VC-SGSN). The VC-SGSN consists of the combination of a voice service box (VSB) and a service GPRS support node (SGSN). The VSB and the SGSN can jointly access the same home location register). The output of the SGSN can be forwarded to the internet via a gateway GPRS support node while the output of the VSB can be forwarded to the public switched telephone network (PSTN).

Abstract: A real time data transmission method is used in a network in which a real time media gateway is provided to allow access to the internet backbone in addition to the usual GPRS specific gateway. The method involves changing the header in a real time data stream as it passes through the network so that it can pass directly to the real time gateway without passing through the GPRS specific gateway. This ensures that the data stream travels along a more direct route and shortens the headers used in the data stream in the process.

Abstract: A mobile telephone system providing general packet radio service (GPRS) includes a radio network controller (RNC) (2A) and/or a base station controller (BSC) and an associated serving GPRS support node (10A) for each domain. The RNCs (2A) and the SGSNs (10A) are interconnected by an Internet protocol (IP) network. When a mobile telephone (6A) moves from one domain to another, the RNC, in the new domain, takes over handling the mobile telephone. The current SGSN (10A) has a detector (20) which detects whether the existing transmission is a real-time transmission and, if it is, a diverter (22) comes into operation to couple the RNC in the new domain to the current SGSN (10A) rather than its associated SGSN (10A). When the call ends, the current SGSN (10A) hands-over the call to the SGSN (10A) in the new domain. This procedure ensures minimal interruption to real-time services by keeping the call anchored to the current SGSN (10A).

Abstract: An improved technique for reducing unnecessary routing area updates ensures that the location of a mobile terminal is known when the mobile terminal starts data communication after being in a standby state. If no packet transmission is taking place when a mobile terminal moves between the first and second wireless access systems in a common routing area of a packet radio access network, no routing area update takes place. If packet transmission is initiated, no routing area update may be required if the mobile is connected to the same wireless access system as in its previous packet transmission. If packet transmission is initiated, a routing area update may take place if the mobile is connected to a different wireless access system than in the previous packet transmission. If packet transmission is initiated by the mobile, the packet transmission initiation may include the routing area update.

Abstract: An improved technique reduces unnecessary routing area updates, while ensuring that the location of a mobile terminal is known when the mobile terminal starts data communication after being in a standby state. Routing area updates are controlled in a packet radio access network architecture having a common routing area controlled by a core network and supported by a first wireless access system and a second wireless access system. The first radio access system provides a mode of operation in which a radio link is maintained between a mobile terminal and the first radio access system after completion of a data transmission. A routing area update takes place if the mobile is located in the second radio access system routing area when the next data transmission is initiated.

Abstract: A real time data transmission method is used in a network in which a real time media gateway is provided to allow access to the internet backbone in addition to the usual GPRS specific gateway. The method involves changing the header in a real time data stream as it passes through the network so that it can pass directly to the real time gateway without passing through the GPRS specific gateway. This ensures that the data stream travels along a more direct route and shortens the headers used in the data stream in the process.

Abstract: A mobile telephone system is provided with a new architecture for dealing with voice internet protocol traffic.

Abstract: A mobile telephone system providing general packet radio service (GPRS) includes a radio network controller (RNC) (2A) and/or a base station controller (BSC) and an associated serving GPRS support node (10A) for each domain. The RNCs (2A) and the SGSNs (10A) are interconnected by an Internet protocol (IP) network. When a mobile telephone (6A) moves from one domain to another, the RNC, in the new domain, takes over handling the mobile telephone. The current SGSN (10A) has a detector (20) which detects whether the existing transmission is a real-time transmission and, if it is, a diverter (22) comes into operation to couple the RNC in the new domain to the current SGSN (10A) rather than its associated SGSN (10A). When the call ends, the current SGSN (10A) hands-over the call to the SGSN (10A) in the new domain. This procedure ensures minimal interruption to real-time services by keeping the call anchored to the current SGSN (10A).

Abstract: A mobile telephone network provides a network operator domain (2a) in which the output from a radio network controller (RAN) (14a) is processed by a voice capable serving GPRS support mode (30) (VC-SGSN).