Multiplex communications – Communication over free space – Repeater
Reexamination Certificate
1997-12-18
2001-02-06
Marcelo, Melvin (Department: 2739)
Multiplex communications
Communication over free space
Repeater
C370S340000, C370S341000
Reexamination Certificate
active
06185196
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a method for transmitting data packets according to a packet data service in a cellular mobile radio network provided for voice and data transmission.
International application WO 95/16330 discloses a plurality of devices and a mobile station for transmitting data packets, which devices permit optimized transmission of the data packets by setting up logic packet data channels. The data packet-specific devices are implemented entirely or partially in the components of a GSM mobile radio system. The data packets are transmitted from and to the mobile station on the packet data channels by using specific packet data protocols.
European patent EP 0 642 283 discloses a mobile radio system in which, in order to reduce the costs for the subscriber with respect to the transmission of data packets in the mobile radio system, a virtual channel is set up by exchanging and storing parameters in a mobile station and a fixed station, which channel permits a rapid setup of a real data communication channel and is maintained during the transmission pauses of the data packets in order to speed up the restoration of the real data communication channel.
In cellular mobile radio networks, such as the GSM mobile radio network (Global System for Mobile Communication), for example, for voice and data transmission, an excessively high signalling load occurs in the case of brief data transmissions. As a rule, a signalling protocol, which ensures there is an exchange of subscriber-specific and network-related information, is initially set up for the transmission of data. A dedicated channel is made available for the transmission of signalling information. After the signalling protocol, a data protocol for the transmission of useful data is set up, in which case a database inquiry can also be intermediately connected in advance while the channel is seized.
SUMMARY OF THE INVENTION
The object of the present invention is to specify a method of the type mentioned at the beginning by means of which the signalling load during the transmission of data packets can be reduced in the mobile radio network and the channels can be utilized more efficiently.
In order to transmit at least one data packet from or to a mobile subscriber station, in each case one channel is reserved in the radio transmission system of the mobile radio network and is linked to a transmission channel, which leads to a separate service network node, to form a continuous data channel.
Data packets and signalling information are transmitted jointly via the data channel in a single data protocol between the mobile subscriber station and the service network node. In this way, signalling information and data packets are transmitted in only one protocol, to be precise the data protocol. Since the data protocol is more complex than a signalling protocol, it is particularly suitable for the additional transmission of signalling information. A signalling protocol alone would not have the data throughput rate for the additional transmission of data packets. When the packet data service is requested, the one data protocol can be used to quickly seize an unseized radio channel in the radio transmission system of the mobile radio network and to release it again, which brings about more efficient use of the radio channels. It is not necessary to reserve any dedicated radio channels for the data packets and signalling information to be transmitted within the scope of the packet data service, since the customary radio channels which are provided for voice and data transmission are assigned to packet transmission when necessary. By using a single data protocol for the joint transmission of data packets and signalling information, the signalling load and the radio channel seizure duration in the mobile radio network are reduced in comparison with the solution with two separate protocols for signalling and for data.
According to one development of the invention, subscriber-specific and/or network-related signalling information is transmitted in the data protocol. The signalling information may comprise authentification, identification, localization, encryption or data service information.
It is advantageous if the signalling information is transmitted in the first part of the data protocol and the data packets are transmitted after the signalling information.
It is also advantageous if the service network node is arranged in a mobile switching center or in addition to a mobile switching center of the switching system or in the radio transmission system of the mobile radio network.
It is advantageous if the service network node checks the access authorization of a mobile radio subscriber to the mobile radio network actually during or after reception of the data packets.
According to another development of the invention, the data packets and the signalling information are transmitted in the data protocol either from the mobile subscriber station to the service network node or in the opposite direction from the service network node to the mobile subscriber station.
REFERENCES:
patent: 6052369 (2000-04-01), Hamalainen et al.
patent: 0 642 283 A2 (1995-03-01), None
patent: WO 95/16330 (1995-06-01), None
patent: WO 95/21508 (1995-08-01), None
Bianchi, G. et al., ‘Packet Data Service over GSM Networks with Dynamic Stealing of Voice Channels’, Global Telecommunications Conference, GLOBECOM'95, IEEE, pp. 1152-1156, Nov. 1995.
ISS, World Telecommunication Congress, Berlin, Frank Mademann, General Packet Radio Service—A Packet Mode Service Within the GSM, pp. 36-40, Apr. 1995.
Marcelo Melvin
Schiff & Hardin & Waite
Siemens Aktiengesellschaft
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