Method for transmitting data in a wireless radio network

Abstract

A method for transmitting data in a wireless radio network having a multiplicity of base stations for wirelessly sending and receiving data, wherein the base stations are wirelessly networked such that each base station can communicate wirelessly with one or more adjacent base stations. Broadcast messages are transmitted between a mobile station for wirelessly sending and / or receiving data and the base stations and broadcast messages are also forwarded between the base stations. These broadcast messages do not have an associated explicit connection between two units in the radio network. Moreover, the mobile station which receives a broadcast message can process this message regardless of the base station from which it originates. This avoids so-called “hand offs,” which are used in the prior art to associate a mobile station with a new base station when the mobile station moves out of range of the earlier base station. These hand offs result in time delays which are unacceptable in safety-critical applications. The novel method is particularly suitable for use in traffic systems, particularly in rail traffic systems, in which, by way of example, a train is controlled via a central unit using the radio network. In such applications, it is particularly important for no relatively long delays to arise in the data transmission, since otherwise the safety of the traffic system is no longer assured.

Description

technical field [0001] The invention relates to a method for transmitting data in a wireless radio network having a plurality of base stations for wirelessly transmitting and receiving data. Background technique [0002] Wireless radio networks, in particular non-cellular systems according to the WLAN standards IEEE 802.11 or 802.16, are used today in many technical fields of application. In particular, such networks are also used for data exchange with mobile stations that move at high speeds, such as cars or rail vehicles. Such radio networks are used here, for example, for multimedia communication. It is desirable that such wireless radio networks are also used for safety-critical communication applications. An example of such a safety-critical application is the control of a train via a radio network, for example in order to transmit commands or signals for controlling and monitoring the train to the train via a wireless radio network. [0003] In safety-critical appl...

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Problems solved by technology

However, the fundamental problem of delay due to switching at the L2 layer is not eliminated by these optimizations

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