Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1996-09-18
1999-09-21
Pham, Chi H.
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370349, H04J 300
Patent
active
059563290
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to methods of packet-wise data transmission in a mobile radio network comprising mobile stations and base stations.
REVIEW OF THE RELATED TECHNOLOGY
Packet-wise data transmission, which is offered by Deutsche Telekom as Datex-P Service, for example, has the advantage that transmission capacity is only required when data are actually being transmitted. Nevertheless, for the entire time, that is, during transmission of the data packets and during pauses between transmissions, a pseudo-permanent connection exists between the subscribers, so no new connection need be established for each data block to be transmitted.
Besides stationary networks for example the conventional telephone network, mobile radio networks have also become known in which radio connections can be established between mobile stations and a base station serving a respective local region (cell), in which instance a plurality of time slots is available at a particular frequency. An example of this type of mobile radio network is the "European Digital Cellular Telecommunication System," which is described in the Technical Specification ETSI-SMG, GSM 05.01, version 4.0.1, October 1992, which was published by the European Telecommunications Standards Institute. This system is called GSM (global system for mobile communications).
German Patent 33 28 601 C1 discloses measures for accelerating the establishment of the connection in a through-switching network, with which the following can be accomplished: a connection can also be established in an intermediate transmission mode, with an identifier being assigned for this transmission mode; devices for recognizing the identifier are provided at the network controls; a network control can only create a connection path in reaction to a request for data transmission from an identified connection; and a holding state is possible for the established connection in the intermediate transmission mode, during which the connection path is available for another transmission of data. These measures, which are typical for a stationary network, are not suited for operation within a mobile radio network, however.
A proposal for a mobile radio network based on packetwise data transmission has become known from D. J. Goodman, "Trends in Cellular and Cordless Communications" in IEEE Communications Magazine, June 1991, pages 31 through 40 . In this instance, a control is provided that is essentially distinguished from those in existing mobile radio networks that a characteristic variable is also transmitted in the packet head, which variable identifies the type of transmitted information.
SUMMARY OF THE INVENTION
It is the object of the present invention to permit packet-wise data transmission in a mobile radio network comprising mobile stations and base stations.
In accordance with the invention, this object is accomplished in that transmission, a traffic channel and an identification number that is valid for the respective packet-wise data transmission are allocated to the respective participating mobile station, allocated traffic channels, which the traffic channel is allocated for packet-wise data transmission, and to the respective mobile station with the use of the identification number.
The method of the invention has the advantage that existing devices in mobile radio networks of this type can also be used extensively for packet-wise data transmission. Moreover, options exist for configuring the method of the invention in detail to meet the requirements. For example, it is possible to define the packet length or the maximum delay time required for transmitting a data packet.
In accordance with a modification, compatibility with existing services is made possible in that, in a mobile radio network in accordance with the GSM standard, RACH channels and time slots of predetermined frames of a dedicated channel are used as control channels in the ALOHA multiple access method for transmission from the mobile station to the base station.
In particular, an advantage
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Bergmann Ansgar
Pernice Frieder
DeTeMobil Deutsche Telekom MobilNet GmbH
Pham Chi H.
Yao Kwang B.
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