Multiplex communications – Communication techniques for information carried in plural... – Adaptive
Patent
1997-09-18
1999-11-02
Pham, Chi H.
Multiplex communications
Communication techniques for information carried in plural...
Adaptive
370338, 370474, G06F 1300
Patent
active
059783869
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a packet radio system, comprising a digital mobile communication network; at least one packet radio support node, connected to the mobile communication network and to one or more other packet radio support nodes and/or providing an access point to an external packet data network; a packet data terminal equipment providing an access point for packet data transmission taking place over the radio interface, said access point supporting a universal communication protocol used by an application associated with the terminal equipment.
BACKGROUND OF THE INVENTION
Mobile communication systems have been developed because there has been a need to free people to move away from fixed telephone terminals without this hindering their reachability. 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 everywhere the user moves. As for mobile communication networks, they provide the user with an efficient access network for mobile data transmission, such an access network providing access to actual data networks. 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 in such a manner that it is capable of providing a packet data service for mobile data terminal equipments 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 equipments. 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 equipments and external data networks, a GSM network acting as an access network. One aspect of the GPRS service network is that it operates almost independently of the GSM network. One of the requirements set for the GPRS service is that it must operate together 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 or which protocols are used in a data terminal equipment. This means that the GSM network and the GPRS service have to support and handle different network addressings and data packet formats, and be prepared for new (future) data network protocols.
DISCLOSURE OF THE INVENTION
The object of the present invention is a packet radio system, providing reliable and effective data transmission, which supports several external data networks and protocols and enables new protocols to be supported as flexibly as possible and with minor modifications.
This object is achieved with the packet radio system described in the introduction, characterized according to the invention by protocol in the internal transmission of the packet radio system, a data packet according to said point-to-point protocol containing the control fields used by the protocol, an identification field identifying the protocol used by the terminal equipment,
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Hamalainen Jari
Kari Hannu
Karppanen Arto
Nokia Telecommunications Oy
Pham Chi H.
Tran Maikhanh
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