Multiplex communications – Communication techniques for information carried in plural... – Adaptive
Reexamination Certificate
1997-09-19
2001-04-03
Vincent, David R. (Department: 2732)
Multiplex communications
Communication techniques for information carried in plural...
Adaptive
C370S329000, C370S395430, C455S451000
Reexamination Certificate
active
06212202
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method for the wireless transmission of digital data, as well as to a telecommunication system.
A method for the wireless transmission of digital data, such as the “DECT” method, as described for example in Funkschau, issue November 1996, pp. 40 ff. This method is used when a stationary transceiver unit having a plurality of mobile transceiver units is supposed to maintain a seemingly simultaneous connection for the wireless transmission of data. For this, a specified time interval is subdivided, for example, into 24 time slots. The first 12 time slots provide for emitting data from the stationary transceiver unit, the second 12 time slots being provided for receiving data through the stationary transceiver. Each mobile transceiver unit is assigned one time slot from the first 12 time slots and one time slot from the second 12 time slots, so that a time-multiplexing method is realized. The same bandwidth and the same transmission time are provided for each possible connection, which thus results in a fixed transmission rate.
Furthermore, for the wire-conducted transmission of digital payload, the asynchronous transfer mode (ATM) method is known, as disclosed, for example, in the periodical Funkschau, issue July 1995, p. 40. Useful data, which originate from a data transmitter and are intended for a data receiver, are divided up into packets of 48 byte lengths and with headers of 5 byte lengths. The header contains information about the data transmitter and the data receiver, as well as information needed for routing the packets to the data receiver. The combination of packet and header is also referred to as a cell. A cell is transmitted over a line when transmission line capacity is available. Thus, the available bandwidth is able to be flexibly distributed among individual network subscribers.
In contrast to other packet-oriented data transmission methods, as known, e.g., from computer technology, the cell length is fixed and a continuous data stream flows on the communication paths, the data stream being filled with void cells when there are not sufficient data to be transmitted. Before a data transmission begins, a favorable path, which can have available capacity, is defined, on which all cells are then transported in that they replace void cells. This eliminates the need for transmitted packets and information to undergo error correction when correctly combining the cells into payload contents at the receiver, as is known from an ethernet.
SUMMARY OF THE INVENTION
One of the advantages of the present invention is that by using a separate, narrow-band signaling channel, a type of modulation can be selected that is insensitive to the Doppler shift of the carrier frequency because of the movement of a transceiver unit.
In addition, data can also be transmitted on a second radio frequency channel to enable an effective power-saving mode for at least one of the transceiver units. It is further beneficial, for example, to design the first radio channel as a broadband channel and the second radio-frequency channel as a narrow-band channel, since by this means the broadband is optimally adapted to the data-transmission rates to be expected.
Furthermore, it is advantageous for the transmitted packets with their headers to be configured as ATM cells, since this eliminates the need for converting the data structure in the line/radio interface, thus improving the data-transmission rate.
In addition, one of the advantages of the telecommunication system of the present invention is that it combines the capability to flexibly adapt the transmission rate with the spatial mobility of the transceiver units. Such a combination renders possible new services, e.g., multimedia services, for mobile transceiver units. Thus, it is especially advantageous to design the first radio channel as a broadband channel that is capable of transmitting the payload contents, thus making it possible to attain a high transmission rate, whereas a narrow-band second radio channel suffices for managing the wireless transmission.
It is advantageous for one of the transceiver units to be conceived as a stationary unit and to be provided with a connection for a line-conducted transmission, since this enables the telecommunication system to be interfaced with a line-conducted, broadband network, preferably an ATM network.
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Funkschau, Jul. 1995, p. 40 cited in specification.
Funkschau, Nov. 1996, pp. 40 ff. cited in specification.
Fettweis Gerhard
Kuehne Joerg
Radimirsch Markus
Stantchev Branimir
Kenyon & Kenyon
Robert & Bosch GmbH
Vincent David R.
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