Multiplex communications – Data flow congestion prevention or control – Control of data admission to the network
Patent
1997-12-17
2000-02-22
Hsu, Alpus H.
Multiplex communications
Data flow congestion prevention or control
Control of data admission to the network
370465, G06F 1100
Patent
active
060288396
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for transmitting data from a transmitter to at least one receiver.
BACKGROUND INFORMATION
Broad-band digital broadcast systems such as digital audio broadcasting (DAB) offer the possibility of multiplexed transmission of multiple programs and/or data services because of their high data rate. The distribution of the total capacity among the individual programs can be varied during operation (dynamic reconfigurability). A flexible distribution of the total transmission capacity allocated to the various program providers by a system operator is described in the publication Eureka 147-DAB II, document WGT3-93.14a (Th. Wachter, Deutsche Bundespost Telecom), where the program providers can distribute the total capacity allocated to them among various programs or data services on their own as desired without regard for other program providers. This is called "virtual system operation." However, no implementation is proposed.
SUMMARY OF THE INVENTION
The process according to the present invention permits "virtual system operation," i.e., the fixed data throughput allocation of a source can be distributed by the source on its own to multiple data streams without regard for other possible sources. Changes can be made in data throughputs of individual data streams of a source without requiring synchronization among the sources or between the transmitter and the sources. This yields the additional advantages that no return lines from the transmitter to the sources are needed, and furthermore, no agreement need be reached among the sources.
One embodiment of the present invention relates to boundary conditions that permit optimum utilization of the available transmission capacity due to the fact that the reduction in data throughput of one data stream is made possible at the latest possible time and the increase in data throughput of another data stream is possible at the earliest possible time.
Through the improvements on the process according to the present invention the time sequences in "virtual system operation" can be further optimized so that the total data throughput available to each source can be utilized optimally and unnecessary delays in reconfiguration of the data throughput of the individual data streams can be avoided.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an exemplary embodiment for carrying out the process according to the present invention.
FIG. 2 shows an example of the distribution of the available transmission capacity between two sources at three different times according to an embodiment of the present invention.
FIG. 3 shows an example of the time sequence of the process according to the present invention.
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention for implementing the "virtual system operation" in a DAB system is described below. This embodiment can also be implemented using other line systems or wireless systems for transmitting data.
The starting point in the following discussion is a configuration according to FIG. 1, for example, including a transmitter 4 with a data multiplexer 5 which receives one or more data streams 12, 13, 14 and 16 and 17 with individual data throughputs from one or more sources 1, 2. The data streams are received over data channels. A fixed total data throughput 11, 15 is assigned to each source for a certain period of time. In the case of the DAB system, the transmitter corresponds to the system operator, the sources correspond to the program providers, for example, and the data streams correspond to the different programs or data services of the program providers. The multiplexer of the transmitter has the function of allocating the data in frame-oriented transmission, for example, to a suitable data package, which corresponds to a certain program or data service, for example. The data frames sent out by the transmitter are received by one or more receivers and demultiplexed, with the various data packages of one frame being allocated to the var
REFERENCES:
patent: 4365296 (1982-12-01), Ulmer
patent: 5509013 (1996-04-01), Adachi et al.
patent: 5862237 (1999-01-01), Gray
Eureka 147-DAB II, document WGT3-93.14a.
Thomas Wachter, Telekom's Expectations of the Requirements on the DAB-Multiplex and the Contribution and Distribution Concepts in Germany, Generldirektion Telekom (Eureka 147-DAB II, document WGT3-93.14a).
Hsu Alpus H.
Qureshi Afsar M.
Robert & Bosch GmbH
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