JPH01284027A - Dama communication system - Google Patents

Abstract

PURPOSE:To reduce the time till the start of talking from the production of a call and to assign lines impartially by providing a function monitoring the line state to assign the line to a slave station. CONSTITUTION:One channel consists of one carrier and the SCPC system is employed, where lots of constituted SCPCs 6a, 6b, 6c,...6n are arranged in a repeater of a communication satellite 1, slave stations 3a, 3b, 3c,'3n are provided, then a carrier in the said SCPC carriers is used as a CSC line 7 for the call connection control between slave stations, the remaining carriers 6a, 6b, 6c,...6n are used as channels, each slave station monitors the state of an idle line and a call start station assigns an idle line to itself and to a called station through the CSC line 7 at the connection between optional slave stations. Thus, the communication is started with a called station monitoring it and the call start station cancels the line assignment to the CSC line after the end of communication.

Description

[Detailed Description of the Invention] [Industrial Application Field J] The present invention is directed to DAMA (Demand As5A!1)
This invention relates to a line allocation method for a satellite communication system based on the multiple Acee88) method.

[Prior art] Figure 3 is a schematic diagram of a satellite communication system that uses the DAMA method. )(3b)
(3c)...(3n) are slave stations, respectively.

Figure 4 shows the S in the repeater onboard the communication satellite (1).
The arrangement order of CPC carriers is shown, and in the figure, (4) indicates the sequence from the master station (2) to each slave station (3a) (3b) (3c) ・=
SCPC carrier for C8C line for sending call connection control signals to (3D), (5) is for each slave station (3a) (3b
) (3c) - SCPC carrier for C8C line from (3n) to master station (2), (6a) (6b) (6c)
. . . (6Ω) is a communication path of 5 cpc carriers allocated by the master station (2) between two slave stations whose communication request has been rejected.

Next, the operation will be explained. One communication path consists of one carrier and is hereinafter referred to as 5cpc: Single Chan
oel per carrier), this configured 8CPC is installed in a large number (6a) (6
b) Using the SCPC method that allows the arrangement of (6c)...(6n), one master station (2) and many slave stations (3a
) (3b)...(3n) are provided, and one or more carriers among the SCPC carriers are used as a common channel signal (hereinafter referred to as CSC; Co
mmon Singling Channel (abbreviated) line (4) (5), remaining carrier (6a)
(6b) (6c)...(6n) are the communication paths, and when connecting any slave stations, the master station (2) receives a line allocation request from the calling slave station using the C8C line (5). is attached, selects an empty communication path from (6a) (6b) (6c)... (6wa) and transmits the CSC line (to the calling and called slave stations).
This was a centralized control type request line allocation system in which call connection control between slave stations was centrally managed by a master station, such as instructing and communicating via 4).

[Problem to be solved by the invention J] Since the conventional DAMA communication system is a centralized control type, a line allocation request is sent from the slave station to the master station every time a call is made, and instructions for free lines are sent from the master station to the calling and receiving stations. Because this method allows communication to begin only after receiving a call from the slave station, there is a problem in that it takes a long time from the time a call is generated to the start of communication.Also, there is the problem that it is difficult to allocate lines evenly due to centralized control by the master station. The invention was made to solve the above-mentioned problems, and aims to provide a DAMA communication system that shortens the time from call generation to the start of a call and that allows lines to be allocated equally.

[Manual arrangement for solving the problem] The DAMA communication system according to the present invention utilizes the broadcast nature of satellite communication to provide all stations with a function of simultaneously monitoring the status of each line.

In the DAI/IA communication system of this invention, the slave station monitors the line status, so that when a call occurs, it allocates a free line to start a call, and when the call ends, it allocates it by itself. Eliminate.

[Embodiment j Hereinafter, one embodiment of the present invention will be described with reference to the drawings. 1st
In the figure, (1) is a communication satellite, (3a), (3b
), (3c), . . . , (32)) are slave stations.

Figure 2 shows the S in the repeater onboard the communication satellite (1).
The arrangement order of CPC carriers is shown, and (7) in the figure is an SCPC carrier for a CSC line for sending a call connection control signal to a calling station or a called station. (6a), (6b),
(6c), . . . , (6D) are communication path SCPC carriers allocated by the calling station between the calling and called stations.

Next, the operation will be explained. One communication channel is configured with one carrier, and a large number of configured SCPCs are installed in the repeater of the communication satellite (1) (6a), (6b), (6c), ・
= , (6n) Using the SCPC method that allows the placement of slave stations (3a), (3b), (3c), ・
=, (3D), one carrier among the 5 cpc carriers is set as a C8IMI line (7) for call connection control between slave stations, and ab carriers (6a), (6b),
(6c), ..., (60) are communication paths, and empty @J
Each slave station monitors the line status, and when any slave stations are connected, the calling station indicates that it will allocate a free line to itself and the called station on the C8C line (7). A call can be started with the called station that was monitoring the call, and after the call ends, the calling station cancels the line assignment to the C8C line (7).

In addition, although the case of a satellite line was explained in the above-mentioned embodiment, the same effect as the above-mentioned embodiment can be obtained by using a ground-based line.

c. Effects of the Invention J As described above, according to the present invention, since the slave station is provided with the function of monitoring the lilOm status and making a prediction (on the line side),
This has the effect of shortening the time from call origination to the start of a call and allocating lines equally.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a satellite communication system employing the DAMA communication system according to an embodiment of the present invention, and FIG. 2 is an SCPC carrier in a repeater mounted on a communication satellite according to an embodiment of the present invention. 1 shows an arrangement diagram of SCPC carriers in a repeater mounted on a communication satellite according to the LIAMA communication system. In the figure, (1) is a communication satellite, (3a) to (3n) are slave stations, (6) is a channel carrier, and (7) is a communication satellite between slave stations.
Indicates an SC carrier. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Figure 1! Fig. 2 6a -6rt: *GoRr'=-'] Completed 7:'
zb-+l1sh csc key and old figure 3 figure 4

Claims (1)

[Claims] One communication path is configured with one carrier, and this configured SCP
A SC that allows multiple Cs to be placed in communication satellite repeaters.
Using the PC method, a certain number of lines are commonly used by each DAMA device, and each time a call occurs, a pair of frequencies in a common pool is assigned to it, and when the call ends, the allocation is canceled and the line is placed in the pool. In a DAMA system that uses a line allocation method called tucking, each DAMA device simultaneously monitors the status of each line using the broadcasting nature of satellite communication.
A DAMA communication method in which a call originating device allocates lines by itself.