JP2001196986A - Satellite packet communication system and its sun transit control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a satellite packet communication system that can efficiently conduct sun transit control without the need for moving all mobile units and to provide its sun transit control method. SOLUTION: A subscriber system processing unit 44 is provided with a sun transit information transmission instruction means that instructs a mobile unit 308 resident in a 1st communication satellite 104 being an object of sun transit to transmit sun transit information to a base station 204 and with a shift instruction transmission indication means that instructs the base station 204 to transmit an instruction to move the mobile unit 308 being a packet destination from the 1st communication satellite 104 to a 2nd communication satellite 102 not an object of sun transit to the mobile unit 308, when a network 44 transmits a packet to the mobile unit 308.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a satellite packet communication system and its sun transit control method.

[0002]

2. Description of the Related Art In satellite communication, a base station, a satellite, and the sun are aligned before and after the equinox and autumn equinox. At that time, solar noise is received by the base station together with an upstream signal.
The fact that downlink signal reception is possible but uplink signal transmission becomes difficult is called "sun transit". In order to avoid the influence of sun transit on communication, the satellite system performs "sun transit control", moves to the satellite that will be the sun transit, and shifts the mobile station that performs speech and signal transmission and reception to a non-sun transit satellite By
Try to avoid interruption of communication.

[0003] The concept of sun transit control according to the prior art will be described below with reference to FIGS. 1 and 2.

FIG. 1 is a diagram conceptually showing an example of a sun transit preparation process for a communication satellite b in sun transit control according to the prior art.

The satellite communication system includes at least a communication satellite No. a 102, a communication satellite No. b 104, a base station 202,
204, and mobile devices 302, 304 and 306.

Wireless operation MOS (Mobil)
e communicationOperation
System) (not shown here) sends a “prepare command” to the base station 204 under the communication satellite b 104 when the communication satellite b becomes the sun transit.
Is transmitted to the base station 202 under the control of the communication satellite a-102. Accordingly, the mobile station 304 waiting at the communication satellite No. b 104 waits at the communication satellite No. a 102. At this time, the mobile station 306 that is talking on the communication satellite b 104 continues the communication on the communication satellite b 104.

FIG. 2 is a diagram conceptually showing an example of a sun transit start process for the communication satellite No. b 104 in the sun transit control according to the prior art.

[0008] When the sun transit of the communication satellite No. b 104 starts, the radio system operation MOS issues an “expulsion start command” to the base station 204 under the communication satellite No. b 104 to the base station 202 under the communication satellite No. a 102. Send "acceptance start command". As a result, the mobile station 306 during a call on the communication satellite b 104 performs forced channel switching to the communication satellite a 102, and the communication satellite a
The call is continued with 2.

Next, when the sun transit of the communication satellite No. b 104 is completed, the radio system operation MOS
Transmits an “end command” to all base stations and cancels the eviction control. As a result, the sun transit control of the communication satellite No. b 104 is completed, and the communication satellite No. b 104 can be on standby.

Next, until the sun transit of the communication satellite No. b 104 ends and the sun transit of the communication satellite No. a 102 starts, both satellites are non-sun transits, so that control of the base station is released.

Next, as the start time of the sun transit of the communication satellite No. a 102 approaches, the sun transit of the communication satellite No. a 102 which occurs continuously will be described with reference to FIG.
In the same manner, the preparation process for the sun transit control described in (1) is performed, and when the sun transit of the communication satellite a-102 starts, the sun transit start process described in FIG.

[0012]

Here, when such a sun-transit control of satellite communication is applied to a satellite packet system for packet communication, there are the following problems.

[0013] That is, in the conventional sun transit control, basically all mobile units shift to non-sun transit satellites. However, in the satellite packet system, even when packet communication is being performed, mobile units not transmitting and receiving signals are not performing. Since the aircraft is not affected by the sun transit, it is only necessary to transfer to a non-sun transit satellite when a signal is actually transmitted and received.

Further, if all the mobile units are shifted to non-sun transit satellites, useless control signals will be transmitted and received in the satellite packet system, causing the system to become congested.

An object of the present invention is to provide a satellite packet communication system and a sun transit control method capable of efficiently executing sun transit control without transferring all mobile stations in view of the above problems.

[0016]

According to a first aspect of the present invention, in a satellite packet communication system including a subscriber processing device, a base station, and a communication satellite, the subscriber processing device is connected to the base station. On the other hand, sun transit information transmission instructing means for instructing a mobile station located in the first communication satellite to be subjected to sun transit to transmit sun transit information, and transmitting a packet from the network side to the mobile station. In this case, the base station is instructed to transmit, to the mobile station, an instruction to transfer a mobile station to which a packet is to be transmitted from the first communication satellite to the second communication satellite that is not subject to sun transit. And a transfer command transmission instructing means.

According to a second aspect of the present invention, in the satellite packet communication system according to the first aspect, the sun transit information includes information indicating that the first communication satellite is subject to sun transit and the mobile station. Contains information on the channel of the second communication satellite to which the transition is made.

According to a third aspect of the present invention, in the satellite packet communication system according to the first aspect, the subscriber processing unit transmits the signal to the base station when sun transit of the first communication satellite is completed. The apparatus further comprises sun transit end instruction means for instructing the transmission of the sun transit information to end.

According to a fourth aspect of the present invention, in the satellite packet communication system according to the first aspect, the subscriber processing unit performs a transition to the base station under the control of the second communication satellite. An acceptance command transmission instructing unit for instructing the mobile device to transmit an acceptance command for speeding up establishment of channel synchronization of the mobile device is further provided.

According to a fifth aspect of the present invention, in a subscriber processing apparatus of a satellite packet communication system including a subscriber processing apparatus, a base station, and a communication satellite,
Sun transit information transmission instructing means for instructing a mobile station located in a first communication satellite to be subjected to sun transit to transmit sun transit information, and when a packet is transmitted from the network side to the mobile station A transfer command for instructing the base station to transmit to the mobile station a command to transfer a packet transmission destination mobile station from the first communication satellite to a second communication satellite not subject to sun transit; Transmission instructing means.

According to a sixth aspect of the present invention, in the subscriber processing apparatus according to the fifth aspect, the sun transit information includes information indicating that the first communication satellite is a target of the sun transit and the mobile station. The second machine is transferred
It is characterized by including channel information of a communication satellite.

According to a seventh aspect of the present invention, in the subscriber processing apparatus according to the fifth aspect, when sun transit of the first communication satellite is completed, the sun transit information of the first transit satellite is transmitted to the base station. A sun transit end instructing unit for instructing to end the transmission is further provided.

According to an eighth aspect of the present invention, in the subscriber processing apparatus according to the fifth aspect, channel synchronization of the mobile station performing the transfer to the base station under the control of the second communication satellite is provided. An acceptance command transmission instructing unit for instructing the mobile device to transmit an acceptance command for speeding up the establishment is further provided.

According to a ninth aspect of the present invention, in a sun transit control method for a satellite packet communication system including a subscriber processing unit, a base station, and a communication satellite, the sun transit is performed before the start of the sun transit. A sun transit information transmitting step of transmitting sun transit information from the base station to a mobile station located in the first communication satellite, and from the network side while the first communication satellite is in the sun transit, When a packet is transmitted to a mobile station, the mobile station issues a command to the base station to shift the mobile station to which the packet is transmitted from the first communication satellite to a second communication satellite that is not subject to sun transit. And a transfer command transmission instructing step of instructing transmission to be performed.

According to a tenth aspect of the present invention, in the sun transit control method for a satellite packet communication system according to the ninth aspect, the sun transit information includes the first transit information.
It is characterized by including information indicating that a communication satellite is a target of sun transit and information of a channel of the second communication satellite to which the mobile device shifts.

According to an eleventh aspect of the present invention, in the sun transit control method for a satellite packet communication system according to the ninth aspect, when the sun transit of the first communication satellite ends, the sun transit is performed from the base station. The method further includes a sun transit end step of terminating the transmission of the information.

According to a twelfth aspect of the present invention, in the sun transit control method for a satellite packet communication system according to the ninth aspect, the second communication satellite is controlled by the second communication satellite before the first communication satellite becomes a sun transit. The mobile station further includes an acceptance command transmission step of transmitting an acceptance command to the mobile station for speeding up establishment of channel synchronization of the mobile station performing the transition to the base station.

[0028]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 3 is a diagram showing the concept of a sun transit control method for a satellite packet system to which the present invention is applied.

The present system includes at least communication satellite No. a 102, communication satellite No. b 104, mobile stations 300 and 3.
01.

Here, the communication satellite No. a 102 and the communication satellite No. b 104 are communication satellites such as NSTAR.

In the satellite packet method, even if a mobile station is under the control of the communication satellite No. 104, which is a sun transit satellite, and is performing packet communication, the mobile station 301 which is not currently transmitting or receiving a signal is not connected to the sun. Since the satellite is not affected by the transit, the satellite is not transferred to the communication satellite a-102 which is a non-sun transit satellite. On the other hand, the mobile device 300 that transmits and receives signals is shifted to a non-sun transit satellite.

Therefore, unlike during standby and during voice communication, the mobile station located in communication satellite b and not transmitting / receiving a signal stays at communication satellite b 104, which is a satellite on the sun transit side. Become.

Next, a sun transit control method for a satellite packet system according to the present invention will be described in detail with reference to FIGS.

FIG. 4 is a diagram for explaining the concept of the sun transit start process in the sun transit control method of the satellite packet system according to the present invention.

The present system includes at least a communication satellite No. a 102, a communication satellite No. b 104, a base station 202, a base station 204, a satellite packet subscriber processing unit (a) SP
It comprises a PM (a) 42, a satellite packet subscriber processing unit (b) S-PPM (b) 44 and a mobile station 308. The base stations 202 and 204 have a function of transmitting and receiving wireless packets to and from a mobile station located in the area. Satellite packet subscriber processing unit (a) S-PPM (a) 42
And satellite packet processing unit (b) S-PP
M (b) 44 is, for example, a packet gateway relay processing device PG
Switch of core network such as W (not shown here)
And has a function of controlling the base station and performing packet exchange and the like.

Satellite packet subscriber system processor (b) S-PPM (b) 44 corresponding to communication satellite No. b 104
Instructs the base station 204 to continuously transmit, as “sun transit information”, the fact that the transit is a sun transit and the channel information of another mobile device to be shifted (for example, information of the communication satellite a 102) To inform the mobile device 308 of the sun transit.

The satellite packet subscriber processing unit (a) S-PPM (a) 42 corresponding to the communication satellite No. a 102 (non-sun transit) instructs the base station 202 to accept. As a result, the establishment of the channel synchronization of the mobile station 308 performing the transition to the mobile station 308 is hastened.

FIG. 5 is a diagram for explaining the concept of processing during sun transit when transmitting a signal from a mobile station in the sun transit control method of the satellite packet system according to the present invention.

When the mobile station 308 attempts to transmit an upstream signal to the communication satellite b, the communication satellite b
Is in sun transit, the base station 204
Is received via the communication satellite b-104. Then, the mobile device 308 uses the received “sun transit information”
Communication satellite b 104 is a sun transit,
By knowing the channel information (information of the communication satellite a-102) of the other satellite to be shifted and switching the transmission channel to the other satellite (the communication satellite a-102), the mobile station autonomously shifts to the communication satellite a-102.

FIG. 6 is a diagram for explaining the concept of the processing during sun transit when a signal is transmitted from the network side to the mobile station in the sun transit control method of the satellite packet system according to the present invention.

Sun transit side satellite communication satellite No. b 1
When a downlink signal is generated for a mobile station located in the area 04, first, the packet subscriber system processor for satellite (b) SP
The PM (b) 44 performs an eviction process for the mobile device 308. That is, the satellite packet subscriber processing unit (b) S-PPM (b) 44 instructs the base station 204 to send the mobile station 308 an eviction command (that is, the mobile station to which the downlink signal is transmitted is subject to sun transit). (A command to transfer from a communication satellite to a communication satellite that is not a target of sun transit). The mobile station 308 that has received the eviction command switches the satellite that performs signal transmission and reception to the communication satellite No. a 102 and transmits a downlink signal using another satellite (here, as described above, the “sun transit” Information is always sent continuously.)

When the sun transit of the communication satellite No. b 104 is completed, until the sun transit of the communication satellite No. a 102 starts, both satellites are non-sun transits. Normal packet communication processing is performed for both downlink communication.

Next, when the sun transit of the communication satellite a-102 is started, the same processing as that described above with reference to FIGS. .

Here, the base station 202 and the base station 2
04 and satellite packet subscriber processing unit (a) S-PP
If the state between the M (a) 42 and the satellite packet subscriber processing unit (b) S-PPM (b) 44 does not match, the state change report from the base station and the state report , Referring to the continuous transmission state / acceptance state, the satellite packet subscriber processing unit (a) S-PPM (a)
42, satellite packet subscriber processing unit (b) S-PP
M (b) 44 compares the state held in the packet with the satellite packet subscriber processing unit (a) S-PPM (a) 4
2. Packet subscriber processing unit for satellite (b) S-PPM
(B) The base station 202 and the base station 204 are controlled so as to match the state held by 44. The state of continuous transmission of sun transit information and the state of acceptance of other units can be confirmed on the base station monitoring screen of the satellite maintenance terminal.

FIG. 7 is a diagram showing an example of the hardware configuration of a satellite packet subscriber processing unit S-PPM to which the present invention is applied.
-Only the part related to the present invention in the PPM configuration is conceptually shown.

Satellite packet subscriber processing unit S-PP
The M400 includes at least a line corresponding unit 401 corresponding to each line to a base station or the like, a connecting unit 402 having the function of a switching hub, and a control unit 403 for controlling the entire system.

The line corresponding unit 401 includes a packet highway switching device HWSW404, a packet line processing device PLU
406 and MLS connection interface circuit MLEIF
408. Packet highway switching device HW
SW404 is a packet line processing unit PLU406, M
Connected to the LS connection interface circuit MLEIF 408 and the line switching device CSW 416, for example, 2 Mbits.
/ S highway interface or other interface. The packet line processing unit PLU 406 includes a packet highway switching unit HWS.
W404 and the connection unit 402 are connected to the base station and the LA.
This is a terminal device that performs communication using the PB protocol, and has a function of transmitting and receiving a call processing signal for packet communication and a signal of a monitoring system to a base station. The MLS connection interface circuit MLEIF 408 is connected to the packet highway switching device HWSW 404 and the line switching device CSW 416 and has a function of connecting to another switching device such as a voice switching device MLS, for example, and transmits and receives broadcast information for packet communication In this case, information on the channel for packet communication is received from the base station, the information is transmitted to the voice exchange MLS as broadcast information, and the broadcast information is transmitted from the base station to the mobile station via the voice exchange MLS. .

The connection unit 402 is connected to the line correspondence unit 401 and the control unit 403, and has a function of a switching hub.

The control unit 403 includes a router RT 412, a PP
M central processing unit PCP414, line switching unit CSW41
6 and a file unit FILU 418. The router RT412 is connected to the PPM central processing unit PCP4.
14 and another packet processing unit PPM
Alternatively, it has a router function when connecting to a packet gateway relay processing device. The PPM central processing unit PCP414 includes a connection unit 402, a router RT412, and a line switching device CSW4.
16 and a file unit FILU 418, and has a function of controlling the entire system by a stored program. The line switching device CSW 416 includes a packet highway switching device HWSW 404, an MLS connection interface circuit MLEIF 408, a PPM central processing unit PCP
414 and the line corresponding unit 401, each of which is a duplicated packet highway switching device HWSW40.
4. The function of performing system switching when a failure occurs in one system of the MLS connection interface circuit MLEIF 408 and the PPM central processing unit PCP414, and the function of the active main system
It has a function of connecting the connection from the line corresponding unit 401 to the PM central processing unit PCP414. File unit FI
The LU 418 is connected to the PPM central processing unit PCP 414 and has a function of storing a control program, station data such as a setting file of the exchange, and the like.

FIG. 8 is a functional block diagram of the satellite packet subscriber processing unit S-PPM shown in FIG. 7, and a portion of the function of the satellite packet subscriber processing unit S-PPM related to the present invention. Only conceptually shown. Each functional block described in FIG. 8 is realized by a program or the like executed in the PPM central processing unit PCP414 in the hardware configuration diagram of the satellite packet subscriber processing unit S-PPM described in FIG.

Satellite Packet Subscriber Processing Unit S-PP
M800 is at least the sun transit start processing unit 8
02, a sun transit mid-processing section 804 and a sun transit end processing section 806.

The sun transit start processing section 802 has a function of executing the sun transit start processing in the sun transit control method of the satellite packet system as described in detail with reference to FIG.

That is, for a base station under the control of a satellite serving as a sun transit, the base station must be a sun transit;
An instruction to continuously transmit “sun transit information” which is information on the channel of another device to be shifted is given.
In addition, an acceptance instruction is issued to a base station under the control of a non-sun transit satellite in order to speed up the establishment of channel synchronization of the mobile station performing the transition.

The mid-transit processing unit 804 is configured as shown in FIG.
And a function of executing the processing during sun transit in the sun transit control method of the satellite packet system as described in detail with reference to FIG.

That is, when a down signal is generated for a mobile station located in the satellite on the sun transit side, the base station is instructed to transmit an eviction command.

The sun transit end processing unit 806 has a function of releasing the sun transit control to the base station when the sun transit ends, and instructing the base station to perform normal packet communication.

(Other Embodiments) In the above-described embodiment, a case has been described as an example where the base station and the satellite packet subscriber processing unit are realized as independent housings.
The present invention is not limited to this case, and it is understood by those skilled in the art that in another embodiment, the base station and the satellite packet subscriber system processing device can be appropriately combined and implemented as one housing. Is self-evident.

[0059]

As described above in detail, according to the present invention, the subscriber processing apparatus can provide the base station with the mobile station located in the first communication satellite targeted for sun transit. Means for instructing the mobile station to transmit sun transit information to the base station when the packet is transmitted from the network side to the mobile station. Transfer command transmission instructing means for instructing the mobile station to transmit a command to shift from a satellite to a second communication satellite that is not a target of sun transit, so that all mobile stations can be efficiently transferred without shifting. A satellite packet communication system capable of performing sun transit control and a sun transit control method thereof can be provided.

According to the present invention, the sun transit information includes information indicating that the first communication satellite is a target of the sun transit and information of the channel of the second communication satellite to which the mobile station shifts. The mobile station under the communication satellite to be transited can efficiently transfer to another communication satellite.

Furthermore, according to the present invention, the subscriber processing device, when the sun transit of the first communication satellite is completed, instructs the base station to terminate the transmission of the sun transit information. Since a termination instructing means is further provided, it is possible to smoothly start waiting for a communication satellite for which sun transit has been completed.

Further, according to the present invention, the subscriber processing device sends the acceptance command to the base station under the control of the second communication satellite to speed up the establishment of the channel synchronization of the mobile station performing the transition. Since the mobile station further includes an acceptance command transmission instructing unit for instructing the mobile station to transmit, the mobile station under the communication satellite to be transited to the sun can efficiently transfer to another communication satellite.

[Brief description of the drawings]

FIG. 1 is a diagram conceptually illustrating an example of a sun transit preparation process for a communication satellite b in sun transit control according to a conventional technique.

FIG. 2 is a diagram conceptually showing an example of a sun transit start process for a communication satellite No. b 104 in sun transit control according to the related art.

FIG. 3 is a diagram illustrating a concept of a sun transit control method of a satellite packet system to which the present invention is applied.

FIG. 4 is a diagram for explaining the concept of sun transit start processing in the sun transit control method of the satellite packet system according to the present invention.

FIG. 5 is a diagram illustrating the concept of processing during sun transit when a signal is transmitted from a mobile station in the sun transit control method of the satellite packet system according to the present invention.

FIG. 6 is a diagram for explaining the concept of processing during sun transit when a signal is transmitted from the network side to the mobile station in the sun transit control method of the satellite packet system according to the present invention.

FIG. 7 is a diagram illustrating an example of a hardware configuration of a satellite packet subscriber processing apparatus S-PPM to which the present invention is applied;

8 is a satellite packet subscriber processing unit S shown in FIG.
It is a functional block diagram of -PPM.

[Explanation of symbols]

42 Packet Subscriber System Processor for Satellite (a) S-PP
M (a) 44 packet subscriber system processor for satellite (b) S-PP
M (b) 102 communication satellite a No. 104 communication satellite b No. 202 base station 204 base station 300 mobile station 301 mobile station 302 mobile station 304 mobile station 308 mobile station 400 satellite packet subscriber processing unit S-PPM 401 line correspondence Unit 402 connection unit 403 control unit 404 packet highway switching device HWSW 406 packet line processing device PLU 408 MLS connection interface circuit MLEIF 412 router RT 414 PPM central processing unit PCP 416 line switching device CSW 418 file unit FILU 800 satellite packet subscriber system Processing unit 802 Sun transit start processing unit 804 Sun transit middle processing unit 806 Sun transit end processing unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Koji Sasada, Inventor NTT Mobile Communication Network Co., Ltd. 2-1-1 Toranomon, Minato-ku, Tokyo (72) Inventor Sego Numajiri 2-chome Toranomon, Minato-ku, Tokyo No. 10 No. 1 F-term in NTT Mobile Communication Network Co., Ltd. (reference) 5K033 AA01 CC01 DA01 DA18 5K072 AA01 AA15 BB22 CC15 DD11 DD16 DD19 EE02 EE23 FF02 FF27

Claims (12)

[Claims] 1. A satellite packet communication system including a subscriber processing device, a base station, and a communication satellite, wherein the subscriber processing device is a first communication satellite to be subjected to sun transit with respect to the base station. Sun transit information transmission instructing means for instructing the mobile station located in the area to transmit sun transit information; and, when a packet is transmitted from the network side to the mobile station, a packet is transmitted to the base station. The second mobile station, which is not subject to sun transit, from the first communication satellite
A satellite packet communication system, comprising: a shift command transmission instructing unit for instructing the mobile device to transmit a command to shift to a communication satellite. 2. The satellite packet communication system according to claim 1, wherein the sun transit information includes information indicating that the first communication satellite is a target of the sun transit and the second communication to which the mobile station shifts. A satellite packet communication system including satellite channel information. 3. The satellite packet communication system according to claim 1, wherein the subscriber processing unit is configured to: when a sun transit of the first communication satellite ends,
A satellite packet communication system, further comprising a sun transit end instruction unit for instructing the base station to end transmission of the sun transit information. 4. The satellite packet communication system according to claim 1, wherein the subscriber processing unit performs channel synchronization of the mobile station performing a transition to the base station under the control of the second communication satellite. A satellite packet communication system, further comprising an acceptance command transmitting means for transmitting an acceptance command for hastening establishment. 5. A subscriber processing device of a satellite packet communication system including a subscriber processing device, a base station, and a communication satellite, wherein the base station is located in a first communication satellite to be subjected to sun transit. Sun transit information transmission instructing means for instructing the mobile station in service to transmit sun transit information; and transmitting a packet to the base station when a packet is transmitted from the network to the mobile station. The second mobile station is not subject to sun transit from the first communication satellite.
A transfer instruction transmission means for instructing the mobile device to transmit an instruction to shift to a communication satellite. 6. The subscriber processing device according to claim 5, wherein the sun transit information includes information indicating that the first communication satellite is a target of the sun transit and the second transit of the mobile device. A subscriber processing device comprising information on a channel of a communication satellite. 7. The subscriber processing device according to claim 5, wherein when a sun transit of the first communication satellite is completed,
A subscriber processing apparatus further comprising a sun transit end instruction unit for instructing the base station to end transmission of the sun transit information. 8. The subscriber processing apparatus according to claim 5, wherein the base station under the control of the second communication satellite receives an instruction to promptly establish channel synchronization of the mobile station performing the transition. The subscriber processing device further comprises an acceptance command transmitting means for transmitting the command. 9. A sun-transit control method for a satellite packet communication system including a subscriber processing device, a base station, and a communication satellite, wherein the first transit satellite serving the sun-transit is located before the start of the sun-transit. A sun transit information transmitting step of transmitting sun transit information from the base station to the mobile station that is performing, and a packet is transmitted from the network side to the mobile station while the first communication satellite is in the sun transit. In this case, the base station is instructed to transmit, to the mobile station, an instruction to transfer a packet-destination mobile station from the first communication satellite to a second communication satellite that is not a target of sun transit. And a shift command transmission instructing step. 10. The sun transit control method for a satellite packet communication system according to claim 9, wherein the sun transit information includes information indicating that the first communication satellite is a target of the sun transit and a transition of the mobile station. A method for controlling a sun transit of a satellite packet communication system, comprising: information on a channel of the second communication satellite. 11. The sun transit control method for a satellite packet communication system according to claim 9, wherein when the sun transit of the first communication satellite is completed,
A sun transit control method for a satellite packet communication system, further comprising a sun transit end step of terminating transmission of the sun transit information from the base station. 12. The sun transit control method for a satellite packet communication system according to claim 9, wherein before the first communication satellite becomes a sun transit, the base station under the control of the second communication satellite is: A sun transit control method for a satellite packet communication system, further comprising an acceptance command transmitting step of transmitting an acceptance command for hastening the establishment of channel synchronization of the mobile station performing the transition.