Process, transmitter and receiver for data transmission with variable traffic volume and a control station for coordinating several such transmitters and receivers
First Claim
1. A method for data transmission with variable traffic volume, wherein a data stream to be transmitted as a whole is divided into time intervals which are subdivided into parts whose number depends on the current traffic volume and which each contain a predetermined number of data, and that the different parts, coded with different, mutually orthogonal codes, are transmitted simultaneously over the same transmission medium and subsequently recombined into the whole.
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Accused Products
Abstract
During data transmission or transmission of redundancy-reduced signals, the traffic volume and, hence, the necessary transmission capacity are not constant. Instead of the prior art approach of more or less intensive use of the total capacity, the basic idea of the invention is coded transmission and simultaneous use of more or less many, mutually orthogonal codes. An embodiment shows the use of a mixed code-division multiplex (CDMA)-time division multiplex (TDMA) radio system. The number of channels assigned to a signal station (CDMA) is determined anew frame-by-frame (TDMA) in response to requests in preceding frames.
241 Citations
16 Claims
- 1. A method for data transmission with variable traffic volume, wherein a data stream to be transmitted as a whole is divided into time intervals which are subdivided into parts whose number depends on the current traffic volume and which each contain a predetermined number of data, and that the different parts, coded with different, mutually orthogonal codes, are transmitted simultaneously over the same transmission medium and subsequently recombined into the whole.
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14. A transmitter for data transmission with variable traffic volume, wherein a demultiplexer is provided for dividing a data stream to be transmitted into time intervals which are subdivided into parts whose number depends on the current traffic volume and which each contain a predetermined number of data, that coders are provided by which the different parts are coded with different, mutually orthogonal codes, and that the differently-coded parts are transmitted simultaneously over the same transmission medium.
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15. A receiver for simultaneous reception of plural signals, said signals being indicative of parts of a data stream with variable traffic volume, said parts being determined by the division of said data stream, within a time interval, based on the traffic volume in said data stream, said parts being coded by mutually orthogonal codes for simultaneous transmission, the receiver having a plurality of decoders which use different, mutually orthogonal codes to decode a plurality of said signals received simultaneously over the same transmission medium, and having a multiplexer which combines said signals decoded by the different decoders into a whole indicative of said data stream.
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16. A control station for coordinating a plurality of transmitters and receivers which each transmit and receive, respectively, signals indicative of parts of a data stream with variable traffic volume, said parts being determined by the division of said data stream, within a time interval, based on the traffic volume in said data stream, wherein the control station includes a control station receiver, responsive to requests from the plurality of transmitters and receivers, for assigning different, mutually orthogonal codes to the plurality of transmitters and receivers, said parts being coded by said mutually orthogonal codes for simultaneous transmission, and wherein the control station includes a control station transmitter for transmitting the assigned codes to the plurality of transmitters and receivers.
Specification