Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1997-07-09
1999-10-19
Ton, Dang
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370401, H04J 316
Patent
active
059700599
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase of international application PCT/FI96/00019, filed Jan. 8, 1996 which designated the U.S.
FIELD OF THE INVENTION
The present invention relates to routing data packets independently of protocol between a mobile station of a packet radio network and a party connected to an external network.
BACKGROUND OF THE INVENTION
Mobile communication systems have been developed because there has been a need to allow people to move away from fixed telephone terminals without losing their ability to be reached. While the use of different data transmission services in offices has increased, different data services have also been introduced into mobile communication systems. Portable computers enable efficient data processing whereever a user moves. Mobile communication networks, provide a user with efficient access network to actual data networks for mobile data transmission. In order to do this, different new data services are designed for existing and future mobile communication networks. Digital mobile communication systems, such as the pan-European mobile communication system GSM (Global System for Mobile Communication), support particularly well mobile data transmission. General Packet Radio Service (GPRS) is a new service in the GSM system, and it is one the items of the standardization work of the GSM phase 2+ in ETSI (European Telecommunication Standard Institute). The GPRS operational environment consists of one or more sub-network service areas, which are interconnected by a GPRS backbone network. A sub-network comprises a number of packet data service nodes, which are referred to as GPRS support nodes (or agents) in this context, each packet data service node being connected to a GSM mobile communication network so that it is capable of providing packet data service for mobile data terminal equipment via several base stations, i.e. cells. The intermediate mobile communication network provides circuit switched or packet switched data transmission between a support node and mobile data terminal equipment. Different sub-networks are connected to an external data network, such as a public switched packet data network (PSPDN). The GPRS service thus produces packet data transmission between mobile data terminal equipment and external data networks with a, a GSM network acting as an access network. The GPRS service network operates almost independently of the GSM network. One of the requirements of the GPRS service is that it must operate with external PSPDNs of different types, for instance, with Internet or X.25 networks. In other words, the GPRS service and a GSM network should be capable of serving all users, irrespective of which type of data networks they want to register in via the GSM network. This means that the GSM network and the GPRS service have to support and handle different network addressing and data packet formats. This handling of data packets also comprises routing in a packet radio network. In addition, users should be able to roam from a GPRS home network into an extraneous GPRS network, the backbone network of the operator of which may support a different protocol (for instance, CLNP) than the home network (for instance, X.25).
SUMMARY OF THE INVENTION
The object of the present invention is to route data packets of different protocols in a packet radio system.
This is achieved with a packet radio network comprising a protocol-independent routing of data packets between a mobile station and a party connected to an external network. In packet radio network of the invention in the internal routing of the packet radio network, a data packet received from a mobile station or an external network is encapsulated according to the internal protocol of the packet radio network.
The present invention also relates to a method for a protocol-independent routing of packets in a packet radio network between a mobile station and a party connected to an external network. The method by
encapsulating data packets received from the mobile station or from the external n
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Ahopelto Juha-Pekka
Kari Hannu
Nokia Telecommunications Oy
Ton Dang
LandOfFree
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