JPS58142646A - Satellite communication system - Google Patents

Abstract

PURPOSE:To minimize the influence of the propagation delay time of a satellite circuit and shorten the connection delay time, by giving a circuit control function to the satellite and by performing the transmission and reception of the call connect signal between a satellite exchange and the satellite. CONSTITUTION:A satellite exchange 3, in which a communication request occurs, accesses a circuit control function 2 on a satellite through a call connect signal transmitting-receiving channel 5, and requests a talking channel. The circuit control function 2 assigns a talking channel based on the talking request of the satellite exchange 3 and sends the information of a talking channel 5 to both of the outgoing and incoming exchanges through a call connect signal receiving channel 4, and then, both of the exchanges start communication with each other through the assigned talking channel 5. As one of the circuit control function, for example, channel assignment against a calling request in a mobile communication system may be mensioned by in anyway, the whole or a part of these functions are performed by the satellite. Therefore, the influence of the delay time interval is reduced by half and the call connecting time is shortened.

Description

[Detailed Description of the Invention] (Technical Field) The present invention provides a method for multiple access satellite communication system.
The present invention relates to a satellite communication device that is compatible with various systems and realizes efficient communication.

(Background Art) Conventionally, a multiple access satellite communication system that adopts a centralized control system is configured as shown in Figure 1. 1 and 1 are satellites that have only relay functions, 2 is a line charge @ 11 stations, and 3 is a communication 4 is a communication channel, and 5 is a channel for transmitting and receiving call connection signals. In such a configuration, since the call connection signal is transmitted and received between 2 and 3 via 5, there is a drawback that the connection delay time is large due to the influence of the propagation delay of the satellite line.

(Problem to be solved by the invention) In order to eliminate these drawbacks, the present invention provides the satellite with a line control function and transmits and receives call connection signals between the slave station and the satellite, thereby eliminating the influence of the propagation delay time of the satellite line. This makes it possible to reduce connection delay time.

(Structure and operation of the invention) Fig. 2 shows an embodiment of the present invention, where ■ is a satellite having a line control function 2, 3 is a slave station for communication, 4 is a communication channel, and 5 is a communication channel for transmitting and receiving call connection signals. Channel. In order to operate this, the slave station 3 where the communication request has occurred is sent to the line charge side 1 function 2 on the satellite via the call connection signal transmission/reception channel 5.
and request a calling channel. The line control function 2 allocates a communication channel based on the communication request of the slave station 3, sends information on the communication channel 5 to both the originating and arriving slave stations via the call connection signal transmission/reception channel 4, and the slave station Communication is started using speech channel 5. The line control function includes, for example, channel allocation for call requests in mobile communication, and all or part of this function is performed by a satellite.

Because of this structure, the effect of the delay time of the satellite line is half that of the conventional one.7. l: It is possible to shorten the call connection time3.Furthermore, in the frequency division multiple access communication system, since the number of active channels can be determined from the satellite, the transmission power control corresponding to the wave number 1tt is 1゜ autonomously possible (effects of the invention) As explained above, by reducing the call connection delay time by j:t, it is possible to improve the utilization efficiency of the satellite line channel and improve the connection quality. . In addition, in the frequency division multiple access system, when the configuration according to the present invention is adopted, it is possible to easily reduce the transmission power cost by '1,4,', so that the satellite power can be used more efficiently and the distortion rate can be improved. Effective in improving call quality.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a multiple access communication system that employs a conventional centralized control system using the same line control station, and Figure 2 is a configuration diagram of the present invention. It is a multiple access communication system that uses ■...Satellite 2...Earth station or device with line control function 3...Slave station 4 for communication... Call channel 5...Call connection signal transmission/reception channel Patent applicant: Nippon Telegraph and Telephone Public Corporation Patent application agent: Megumi Yamamoto -

Claims (1)

[Claims] A satellite communication system in which two or more earth stations communicate via a satellite using a multiple access method, characterized in that the satellite is equipped with part or all of the line control function.