JP3345223B2 - Satellite communication method and central and terminal stations - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite communication method for performing communication from a plurality of terminal stations to a central office by a time-division multiple access (hereinafter, referred to as "TDMA") system using one transmission wave. , The monitoring of the state of each terminal station by the central office.

[0002]

2. Description of the Related Art FIG. 8 is a system configuration diagram showing a configuration of a communication system to which the present invention and a conventional satellite communication method are applied. In the figure, ₁₁ to 1 _n are a plurality of terminal stations, and 2 is a communication satellite launched into outer space and relaying a satellite line. A central station 3 is connected to each of the terminal stations ₁₁ to 1 _n via a satellite line relayed by the communication satellite 2 and monitors the state of each of the terminal stations ₁₁ to 1 _n .

[0003] FIG 9 is a sequence diagram illustrating a method of monitoring a station status of each terminal station 1 ₁ to 1 _n by the central station 3 in a conventional satellite communications method. In FIG, 1 ₁ to 1 _n is the terminal station, 3 is the same central office, 4 ₁ to 4 _n is the status request signal transmitted individually to each terminal station 1 ₁ to 1 _n from the central station 3 , 5 _{1 to} 5 _n are terminal stations ₁₁ to 1
_This is a status signal sent back from _n to the central office 3.

Next, the operation will be described. If the central station 3 requests the transmission of station status of each terminal station 1 ₁ to 1 _n, 9
As shown in, first, the status request signals 4 ₁ transmitted using the control signal transmission slots satellite line to the terminal station 1 _1. Terminal station 1 ₁ receives the status request signal 4 ₁ sends back to the central station 3 generates a status signal 5 ₁ for notifying the station status of the own station. Status signals 5 ₁ central station 3 that receives the from the terminal station 1 _1, then sends the status request signals 4 ₂ to the terminal station 1 _2, the terminal station 1 ₂ which has received it, the stations of the station It generates a status signal 5 ₂ to notify the state to return to the central station 3. The central station 3 similarly requests a transmission of the station state in the same manner, and finally transmits a status request signal 4 _n to the terminal station 1 _n . The terminal station 1 _n having received it generates a status signal 5 _n for notifying the station state of the own station and returns it to the central station 3. The central office 3 receives the status signal 5 _n and ends a series of processing. As described above, the central office 3 knows the station states of all the terminal stations ₁₁ to 1 _n and monitors them.

[0005] Japanese Patent Application Laid-Open No. 6-296149 discloses a technique describing a technique related to such a conventional satellite communication method.

[0006]

Since conventional satellite communication method [0008] is constructed as described above, when monitoring station status of the terminal station 1 ₁ to 1 _n, the status request signals 4 ₂ to 4 _n
Can not send to the status signal 5 ₁ ~5 _n-1 with respect to the status request signals 4 ₁ ~4 _n-1 sent the previously sent back, knowing the station status of all of the terminal stations 1 ₁ to 1 _n since much time is required for, not only becomes low use efficiency of the satellite link, a TDMA-method time slot, i.e. the status request signals 4 ₁ to 4 _n and status signals 51 _to using the TDMA slot since the the 5 _n transmitted, there are restrictions on the information length which can be contained in the status signal 5 ₁ to 5 _n, in order to obtain detailed station information is the status request signals 4 ₁ to 4 _n and the status signal 5 There is a problem that transmission and reception of _{1 to} 5 _n must be repeated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a satellite communication method capable of improving the use efficiency of a satellite line.

[0008]

According to the first aspect of the present invention, there is provided a satellite communication method for transmitting a group designation signal from a central station.
Of the terminal stations that received the
Changes the group number of its own station.
And then responds to the status request signal from the central office.
The group number of the status request signal and the group of the own station.
If the station numbers are the same,
Task signals using time-division multiple access time slots
This is transmitted to the central office .

The central station according to the second aspect of the present invention is a group office comprising a specific terminal station among a plurality of terminal stations.
Transmits a group designation signal that designates
A status request signal requesting status transmission,
The transmission is performed by designating the group number of the loop designation signal .

[0010] Further, a terminal station according to the invention of claim 3 receives a group designation signal transmitted from a central office,
Based on this group designation signal,
Changes and receives the status request signal sent from the central office.
Group number specified by this status request signal
Is the same as the group number of your own station.
The status signal including the status is timed by the time division multiple access method.
The data is transmitted to the central office by a slot .

[0011]

[0012]

[0013]

According to the first aspect of the present invention, there is provided a satellite communication method comprising:
The central station transmits a group designation signal to the terminal station,
The terminal station determines its own group based on this group designation signal.
Change the group number and then request the status from the central office
The status request signal group number and
If the group numbers of the stations are the same,
The status signal including the time slot
The central office sends data to the central office by
To obtain the station status of the terminal station in the loop,
The satellite signal can be sent only once
And the terminal station group configuration
Can be changed.

A central office according to the second aspect of the present invention.
Is a group consisting of a specific terminal station among a plurality of terminal stations.
Transmits a group designation signal that designates
Status request signal requesting status transmission
Since the transmission is performed by specifying the group number of the constant signal, the station status
Group of terminal stations requesting transmission of
To obtain the station status of the terminal stations in the updated group.
Status request signal only needs to be sent once.
Improve the efficiency of using satellite links.

[0015] A terminal station according to the third aspect of the present invention.
Receives the group designation signal transmitted from the central office,
Based on this group designation signal,
Changes and receives the status request signal sent from the central office.
Group number specified by this status request signal
Is the same as the group number of your own station.
The status signal including the status is timed by the time division multiple access method.
Since data is transmitted to the central office by slot, each terminal station's group
Group number can be changed by the group designation signal from the central office
To obtain the station status of the terminal station in the changed group.
Only need to send the status request signal once
In this way, the efficiency of using satellite links is improved.

[0016]

[0017]

[0018]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sequence diagram showing monitoring of the station status of each terminal station in the satellite communication method according to the first embodiment of the present invention. In the figure, ₁₁ to 1 _n are terminal stations, 3 is a central office, 5
Numerals _{1 to} 5 _{n denote} status signals, which are the same as or equivalent to those of the related art _denoted by the same reference numerals in FIG. Further, 4 to request the transmission of station status of each terminal station 1 ₁ to 1 _n, in parallel to the center station 3 to each terminal station 1 ₁ to 1 _n, are transmitted simultaneously in this example This is a common status request signal.

FIG. 2 shows a TD for communication from each of the terminal stations 1 ₁ to 1 _n to the central station 3 according to the satellite communication method of the present invention.
FIG. 4 is an explanatory diagram showing a time slot sequence of the MA system. In the figure, 6 _{1 to} 6 _n are time slots (TDMA slots) of the TDMA system.

FIG. 3 shows a satellite communication method according to the present invention.
It is an explanatory diagram showing the data structure of a status request signal 4 sent from the central station 3 to each terminal station 1 ₁ to 1 _n. In the figure, reference numeral 11 denotes a header portion in which a code indicating that this signal is the status request signal 4 is stored.
Is an identification code unit identification code uniquely set in each in order to identify each terminal station 1 ₁ to 1 _n are stored.

Next, the operation will be described. If the central station 3 to each terminal station 1 ₁ to 1 _n, requests transmission of each station status, the central station 3 identifying code 12 shown in FIG. 3
The generated common status request signal 4 obtained by the identification code for all of the terminal stations 1 ₁ to 1 _n, parallel transmitted to each terminal station 1 ₁ to 1 _n, as shown in FIG. 1 I do.
This status request signal 4 reaches all the terminal stations ₁₁ to 1 _n via a satellite line relayed by the communication satellite 2. Each terminal station 1 receiving this status request signal 4
₁ to 1 _n, in order to notify the respective station status, the status signal 51 _to which contains the identification code and the local state of the own station
5 _n is generated and sent back to the central office 3. The return of the status signal 5 ₁ to 5 _n is performed using the TDMA slot 6 ₁ to 6 _n are predetermined for each terminal station ₁ 1 to 1 _n. Central station 3 terminates the series of processes by receiving a status signal 5 ₁ to 5 _n that sent back from each terminal station 1 ₁ to 1 _n in order. In this way, the central station 3 can monitor the station states of all the terminal stations ₁₁ to 1 _n by transmitting the common status request signal 4 only once, and Usage efficiency can be improved.

Embodiment 2 FIG. FIG. 4 is a sequence diagram showing the monitoring of the station status of each terminal station in the satellite communication method according to the second embodiment of the present invention. Incidentally, 4 is a common status request signal transmitted in parallel with respect to each terminal station 1 ₁ to 1 _n from the central station 3, want to monitor station status terminal station,
For example in that it includes an identification code of the terminal station 1 _2, 1 _m, is different from the status request signal of Example 1 are denoted by the same reference numerals in FIG.

Next, the operation will be described. If the central station 3 requests the transmission of the station state by specifying a and 1 _m terminal station 1 _2, the central station 3 identification code an identification code 12 terminal stations 1 ₂ and 1 _m shown in FIG. 3 A common status request signal 4 is generated as shown in FIG.
Transmit in parallel to ₁ to 1 _n . This status request signal 4 reaches all the terminal stations ₁₁ to 1 _n via a satellite line relayed by the communication satellite 2. Terminal station 1 ₂
And 1 _m , since the identification code of the own station is included in the identification code portion 12 of the status request signal 4, the status including the station state of the own station and the identification code are included in order to notify the respective station states. returning to the central station 3 generates a signal 5 ₂ or 5 _m. It should be noted that the status signal 5 ₂
And the return of 5 _m is the TD specified by the central office 3
MA slots 6 ₁ and 6 ₂ (In this embodiment, the TDM is performed according to the order in the identification code section 12 of the status request signal 4).
It is performed using the assigned Yuku is) from A slot ₆₁ in order. Central station 3 receives the status signals 5 ₂ sent back from these terminal stations 1 ₂ and 1 _m, a 5 _m in order to end the series of processes. As described above, the central station 3 can monitor the station state of the terminal station designated by itself by transmitting the common status request signal 4 only once, and can improve the use efficiency of the satellite line relayed by the communication satellite 2. Can be improved.

Embodiment 3 FIG. FIG. 5 is a sequence diagram showing the monitoring of the station status of each terminal station in the satellite communication method according to the third embodiment of the present invention. In the third embodiment, the terminal stations 1 ₁ to 1 _n are grouped into a plurality of (two in the illustrated example) groups.
_1, 1 _2, ..., a group number of the group to which 1 _m belongs, 8 denotes a terminal station 1 _5, ..., the group number of the group to which 1 _n belongs respectively. Reference numeral 4 denotes a common status request signal transmitted in parallel from the central station 3 to each of the terminal stations 1 ₁ to 1 _n . The group number of the group to which the terminal station whose station state is to be monitored belongs is indicated by the number. This is different from the first embodiment shown in FIG.

Next, the operation will be described. The central station 3 designates a certain group, for example, the group of the group number 7, and each of the terminal stations 1 ₁ , 1 ₂ ,.
... When requesting transmission of 1 _m station status, the central office 3
It is to generate a common status request signals 4 in which the identification code portion 12 shown in FIG. 3 and group number 7, parallel to be transmitted to each terminal station 1 ₁ to 1 _n, as shown in FIG.
This status request signal 4 reaches all the terminal stations ₁₁ to 1 _n via a satellite line relayed by the communication satellite 2. In each of the terminal stations 1 ₁ , 1 ₂ ,..., 1 _m belonging to the group with the group number 7, the group number 7 of the group to which the own station belongs is specified in the identification code section 12 of the received status request signal 4. since it is, in order to notify the respective station status, status signals 5 ₁ including the identification code and the local state of the own station, 5 _2, ..., to the central station 3 generates a 5 _m I will send it back. The return of the status signals 5 ₁ , 5 ₂ ,..., 5 _m is based on TDMA slots 6 ₁ , 6 ₂ ,
..., it is carried out using a 6 _k. Central station 3 Each of the terminal stations ₁ 1, 1 _2, ..., 1 status signal 5 ₁ sent back from _m, 5 _2, ..., a series of receiving and processing 5 _m in order To end. In this way, the central station 3 can monitor the station states of a plurality of terminal stations belonging to the group designated by itself by transmitting the common status request signal 4 only once, and The use efficiency of the satellite line to be used can be improved.

Embodiment 4 FIG. FIG. 6 is a sequence diagram showing a change in the group configuration of terminal stations in the satellite communication method according to the fourth embodiment of the present invention. In the figure, because 9 that each of the terminal stations 1 ₁ to 1 _n specifies the group including a group designation signal line terminal 3 transmits to each terminal station 1 ₁ to 1 _n, 10 are designated this group Signal 9
Is the group number of the group newly grouped by the change of the group configuration.

FIG. 7 is an explanatory diagram showing a data structure of the group designation signal 9. As shown in FIG. In the figure, reference numeral 13 denotes a header section in which a code indicating that this signal is the group designation signal 9 is stored, 14 denotes a group number section in which the group number of a group newly designated by the central office 3 is stored, and 15 Is the terminal station 1 ₂ belonging to this new group,
1 _5, ..., an identification code unit identification code of 1 _m is stored.

Next, the operation will be described. Each terminal station 1 ₁
The group configuration of １1 _n is the group number 7 shown in FIG.
Requested when that is the two groups of group number 8, a plurality of terminal stations which do not belong to the same group, for example, terminal station 1 _2, 1 _5, ..., the transmission of the station status of 1 _m and When the need arises, the central station 3 first transmits the group designation signal 9 to each of the terminal stations ₁₁ to 1 _n in parallel. The group designating signal 9, the group number 10 of the new group to the group number portion 14, the terminal station 1 belonging to the newly set group identification code 15 _2, 1 _5, ..., 1 The identification codes of _m are set respectively, and reach all the terminal stations ₁₁ to 1 _n via a satellite line relayed by the communication satellite 2. Terminal station 1 _2, 1 _5, ..., so the 1 _m identification code of the own station in the identification code 14 in this group designation signal 9 is included, the group number of each group to which the own station belongs The group number is changed to the group number 10 set in the group number section 14. Then, as in the case of the third embodiment, the central station 3 transmits the status request signal 4 in which the group number 10 is set to the identification code section 12 to each of the terminal stations ₁₁ to 1 _n in parallel. This new group number 1
Terminal stations 1 ₂ , 1 ₅ ,... Belonging to group 0
-, 1 from each of _m, the status signal 5 _2, 5 ₅ including the identification code and the local state of the own station, · · · ·, 5 _m is sent back. As described above, if the central office 3 changes the group configuration by transmitting the group designation signal 9 as necessary, the central office 3 thereafter changes the common status request signal 4 to 1
Only by transmitting once, the station status of a plurality of terminal stations belonging to the newly designated group can be monitored, and the use efficiency of the satellite line relayed by the communication satellite 2 can be improved.

Embodiment 5 FIG. Next, a fifth embodiment of the present invention will be described. In the fifth embodiment, in monitoring the station status of each of the terminal stations 11 ₁ to 1 _n , the central station 3 requests detailed terminal state information from each of the terminal stations ₁₁ to 1 _n . The monitoring of the station status is performed according to the sequence diagram shown in FIG. That is, the central office 3 is connected to each of the terminal stations ₁₁ to 1 _n
When requesting transmission of detailed information on the station status of
As a common status request signals 4 to parallel transmitted to each terminal station 1 ₁ to 1 _n, the header portion 11 shown in FIG. 3
Is a code indicating that this signal is a status request signal requesting detailed station state information.
2 to produce what was identification code for all of the terminal stations 1 ₁ to 1 _n. This status request signal 4 is shown in FIG.
As shown in (1 ₎ , the data is transmitted from the central station 3 to all the terminal stations ₁₁ to 1n via a satellite line relayed by the communication satellite 2. Each terminal station 1 ₁ to 1 _n which has received the status request signals 4, a status signal 5 ₁ to 5 _n containing respectively normal status request with the detailed station status different own station and the identification code generated and sent back to the central station 3 by using a TDMA slot 6 ₁ to 6 _n which is determined in advance to each terminal station ₁ 1 to 1 _n. The central office 3 has terminal stations 1 ₁ to 1
the returned status signals 5 ₁ to 5 _n from _n received in order to end the series of processes. In this way, the central station 3 can monitor the detailed and unusual station states of all the terminal stations ₁₁ to 1 _n collectively by sending the common status request signal 4 only once. In addition, the use efficiency of a satellite line relayed by the communication satellite 2 can be improved.

Embodiment 6 FIG. In the fifth embodiment has dealt with the case of monitoring collectively detailed station status of all of the terminal stations 1 ₁ to 1 _n, the detailed station status by specifying some specific terminal station It is also possible to monitor or specify a group to monitor the detailed station status of each terminal station belonging to the group. Example 6 is one in which the central station 3 shows the case of requesting the transmission of information of the detailed station status by specifying the terminal station 1 ₂ and 1 _m. If the central station 3 requests transmission of detailed information station status of the terminal station 1 ₂ and 1 _m, the central station 3 each terminal station 1 ₁ to 1 _n
Common status request signal 4 transmitted in parallel to
As, a code indicating that the header section 11 shown in FIG. 3 is a status request signal This signal requests information detailed station status and the identification code part 12 and the identification code of the terminal station 1 ₂ and 1 _m Generate things. The status request signal 4 as shown in FIG. 4, is transmitted to all the terminal stations 1 ₁ to 1 _n via a satellite link to be relayed from the central station 3 by the communication satellite 2. This status request signal 4
Include the terminal stations 1 ₂ and 1 the identification code of the own station is included in the identification code section 12 _m, respectively normal status request with the detailed station status different own station identification code I status signal 5 to generate a ₂ or 5 _m, TDMA slot 6 ₁ specified by the central station 3
When 6 ₂ (in this example, Yuku allocated from the TDMA slot 6 ₁ in order according to the order in the identification code section 12 of the status request signal 4) to return to the central station 3 by using the. Central station 3 receives the status signals 5 ₂ sent back from these terminal stations 1 ₂ and 1 _m, a 5 _m in order to end the series of processes. Thus, only the central station 3 sends one common status request signals 4, the itself specified terminal station 1 ₂ and 1 _m, normally be monitored collectively different detailed station status and Thus, the use efficiency of the satellite link relayed by the communication satellite 2 can be improved.

[0031]

As described above, according to the first to third aspects of the present invention, the group designation signal is transmitted from the central office.
Of the terminal stations that received the
Changes the group number of its own station.
And then responds to the status request signal from the central office.
The group number of the status request signal and the group of the own station.
If the station numbers are the same,
Task signals using time-division multiple access time slots
The status request signal is sent from the central office because it is sent to the central office.
Is sent only once, the terminal stations in the specified group
The station status can be obtained, and the efficiency of satellite line use is improved.
As well as change the terminal station group configuration.
You.

[0032]

[0033]

[0034]

[0035]

[Brief description of the drawings]

FIG. 1 is a sequence diagram showing monitoring of a station state in a satellite communication method according to Embodiments 1 and 5 of the present invention.

FIG. 2 is an explanatory diagram showing a time slot sequence of the TDMA system in the satellite communication method of the present invention.

FIG. 3 is an explanatory diagram showing a data configuration of a status request signal in the satellite communication method of the present invention.

FIG. 4 is a sequence diagram showing monitoring of a station state in the satellite communication method according to Embodiments 2 and 6 of the present invention.

FIG. 5 is a sequence diagram showing monitoring of a station state in the satellite communication method according to the third embodiment of the present invention.

FIG. 6 is a sequence diagram showing a change of a group configuration in a satellite communication method according to a fourth embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a data configuration of a group designation signal in the embodiment.

FIG. 8 is a system configuration diagram showing a configuration of a communication system to which the present invention and a conventional satellite communication method are applied.

FIG. 9 is a sequence diagram showing monitoring of a station state in a conventional satellite communication method.

[Explanation of Codes] 1 ₁ to 1 _n terminal stations, 2 communication satellites, 3 central stations, 4
Status request signal, 5 ₁ to 5 _n status signal, 6
_{1 ~6 n} TDMA slot (time slot).

Claims (3)

(57) [Claims] A communication between a central station and a plurality of terminal stations is performed via a satellite line relayed by a communication satellite, and station states of the plurality of terminal stations are monitored by the central station. A specific terminal station belonging to the plurality of terminal stations.
A group designation signal that designates the group number
From the station to the plurality of terminal stations via the satellite line
Transmitting a group designation step;
Of the terminal stations designated by the group designation signal,
The group number of the own station based on the group designation signal
Changing a group to be changed, and
Requests the transmission of terminal station status from multiple terminal stations
The status request signal to
Status request step to send by specifying the loop number
And the plurality of terminal stations receive the status request.
The group number of the signal and the group number of the own station are the same.
If the status signal including the station status of the own station is
To the central office by the time slot of the original connection method.
And a status return step . 2. Via a satellite line relayed by a communication satellite.
To communicate with a plurality of terminal stations,
A central station that monitors the status of the plurality of terminal stations;
Group that designates a group consisting of specific terminal stations
Request signal to send the station status of the terminal station.
The status request signal to
A central office that transmits by specifying a loop number. 3. Via a satellite line relayed by a communication satellite.
And communicates with the central office.
Status to monitor the central office with several other terminals.
In the receiving terminal station, the group transmitted from the central office is
Group designation signal, and based on this group designation signal
To change the group number of the local station, and
Receive the status request signal
The group number specified by the signal is the same as the group number of your own station.
If the status signal is the same as the
The time division multiple access time slot allows the central office
A terminal station for transmitting to a terminal station.