Telecommunications – Transmitter and receiver at separate stations – Single message via plural carrier wave transmission
Patent
1987-11-24
1989-10-03
Griffin, Robert L.
Telecommunications
Transmitter and receiver at separate stations
Single message via plural carrier wave transmission
455 56, 455 32, 379 59, 34082552, H04B 100, H04B 700
Patent
active
048722049
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to the transmission or communication field.
In many different applications, e.g. within the the wireless or radio transmission or communication field, a system is provided including a number of central stations and a plurality of individual remote stations each communicating with a central station to which the individual remote station in question is assigned and from which it receives a control signal. In the system, particularly in systems including a large number of individual remote stations, the control signal generated by and transmitted from the central station to which the remote station in question is assigned together with other remote stations are transmitted to all these remote stations simultaneously. The individual remote station is consequently to determine whether the control signal is intended for the remote station itself or not, i.e. intended for one or more remote stations different from the remote station itself, and for this purpose the control signal is composed of two parts which constitute respective periods of time of the control signal and which include information regarding the intended receiving station or the intended receiving stations and the control information itself, respectively.
In conventional systems of the above type, the individual remote station permanently supervises and/or decodes the control signal in order to detect whether the information transmitted from the central station is intended for the remote station itself. Most of the time, the individual remote station only has to determine whether the first part of the signal includes information regarding the receiving station itself, i.e. including an address corresponding to the address of the remote station itself, or, alternatively, a so-called telegram information relevant for the remote station itself or relevant for its operation. While the second part of the control signal intended for one or more remote stations different from the remote station in question is transmitted to the remote stations, the remote station in question receives, but does not act upon information transmitted from the central station, as the information is not relevant for the remote station, and for a period of time corresponding to the second part of the control signal the remote station or at least its receiver section is inactive.
SUMMARY OF THE INVENTION
As will be understood, the operation of the system described above in which the control signals are transmitted to the individual remote stations simultaneously, the capacity of the individual remote stations is not fully utilized as the control signal transmitted from the central station to which the remote station in question is assigned is most of the time not relevant for the remote station in question, which is determined by the individual remote station by its evaluation of the first part of the control signal.
It is therefore an object of the present invention to provide a method of operating a radio transmission or communication system of the above type, i.e. a radio transmission or communication system including a number of central stations and a plurality of individual remote stations, in accordance with which method the capacity of the individual remote stations is more fully utilized for improving the operation of the system and more specifically for improving the quality of transmission and reception of the individual remote station.
This object is obtained by a method of the present invention and of operating a radio transmission or communication system including a number of central stations, and a plurality of individual remote stations said central stations generating and transmitting control signals in respective transmission channels, each remote station being assigned a specific central station of said number of individual central stations, each of said control stations comprising a first part constituting a first period of time of the control signal and including information identifying one or mor
REFERENCES:
patent: 4597105 (1986-06-01), Freeburg
patent: 4633463 (1986-12-01), Mack
patent: 4644347 (1987-02-01), Lucas et al.
patent: 4669107 (1987-05-01), Eriksson-Lennartsson
Gras Jean-Jacques
Hammer Ole
Griffin Robert L.
Motorola Inc.
Parmelee Steven G.
Smith Ralph
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