Multiplex communications – Communication over free space – Repeater
Reexamination Certificate
1997-08-06
2001-01-09
Kizou, Hassan (Department: 2738)
Multiplex communications
Communication over free space
Repeater
C370S337000, C370S349000, C370S350000
Reexamination Certificate
active
06172967
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a system and method for servicing communications between a base station and plural mobile stations in mobile communications such as automobile radio communications.
In a conventional mobile communication system, frequency division multiple access (abbreviated to FDMA) has been used (refer to JP-A-114498/1988). According to that method, a base station branch-outputs a receive carrier signal from a current data collecting mobile station to the next mobile station according to one-to-N polling system. Mobile stations specified by the base station for data collection mutually and sequentially monitor the carrier signal and then start to transmit data to the base station when the off-state of the carrier signal is detected.
A method of adding retransmission request information when transmission data in a base station exceeds a specified length and then requesting the remaining data transmission by means of the base station after a completion of polling operation has been used as a polling control method in a mobile communication system (refer to JP-A-276935/1989).
On the other hand, a communication system is known that uses time division multiplex access (hereinafter, often referred to as TDMA) to transmit data from a base station to mobile stations (hereinafter, often referred to as down-stream), and time division multiple access to transmit data from a mobile station to the base station (hereinafter often referred to as up-stream).
However, one communication channel corresponds to one mobile station in the conventional communication method. Hence, there has been the disadvantage that the number of stations per communication channel cannot be increased, so that the transmission efficiency cannot be improved.
SUMMARY OF THE INVENTION
The objective of the present invention is to solve the above-mentioned problems. The objective of the invention is to provide a method for servicing radio communications between a base station and plural mobile stations in mobile communications, which can improve transmission efficiency.
Another objective of the present invention is to provide a system for servicing radio communications between a base station and plural mobile stations in mobile communications, which can improve transmission efficiency.
The objective of the present invention is achieved by the method of servicing communications between a base station and plural mobile stations which are linked by a radio line in which plural communication channels are set, comprising the steps of setting an identifier indicating a mobile station in slot units corresponding to each of the plural communication channels, and communicating with plural mobile stations in the same communication channel.
The method further comprises the step of performing communications between the base station and the plural mobile stations using a polling switching system.
In a system for servicing communications between a base station and plural mobile stations which are linked by a radio line in which plural communication channels are set, an identifier indicates a mobile station in slot units corresponding to each of the plural communication channels, and communications with plural mobile stations in the same communication channel is accomplished.
The base station communicates with the plural mobile stations using a polling switching system.
The radio line uses time division multiplex access to transmit information from the base station to a mobile station and uses time division multiple access to transmit information from a mobile station to the base station.
The method comprises the step of using time division multiplex access in the radio line to transmit information from the base station to a mobile station and using time division multiple access in the radio line to transmit information from a mobile station to the base station.
REFERENCES:
patent: 5121391 (1992-06-01), Paneth et al.
patent: 5274841 (1993-12-01), Natarajan et al.
patent: 5548816 (1996-08-01), DeVaney
patent: 5671219 (1997-09-01), Jensen et al.
patent: 63-114498 (1988-05-01), None
patent: 1-276935 (1989-11-01), None
Kizou Hassan
NEC Corporation
Ostrolenk Faber Gerb & Soffen, LLP
Slavitt Mitchell
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