JP6137878B2 - Satellite communication system, satellite communication control method, mobile station, fixed station, and program - Google Patents

Description

The present invention includes a fixed station and a mobile station, and communication between the fixed station and the mobile station and between the mobile stations is performed via a satellite, a satellite communication system, a satellite communication control method, a mobile station, a fixed station, and Regarding the program.

  In communication between mobile stations in a conventional satellite communication system, the mobile station requests communication from the fixed station, and the fixed station transmits channel setting information including available frequencies to the mobile station. The mobile station performs satellite communication by setting a connection line for satellite communication based on the line setting information transmitted from the fixed station. When satellite communication ends, the connection line is immediately released, and the fixed station does not monitor the status of the mobile station until the next communication.

  Techniques relating to satellite communication systems are disclosed in Patent Document 1 and Patent Document 2. The mobile communication system disclosed in Patent Document 1 controls transmission power of a mobile based on position information of the mobile. In the satellite communication system disclosed in Patent Document 2, the slave station detects its own position, and determines the specification value of the uplink and / or downlink CSC (Common Signaling Channel) line at the position based on the detection result.

JP-A-5-175894 JP 2005-295090 A

  In communication between mobile stations of a satellite communication system in the X band, satellite parameters such as repeater characteristics and movable beam control characteristics, maximum EIRP (Equivalent Isotropic Radiated Power) and G / T (Gain) Due to the changing mobile station parameters such as to noise temperature ratio, it is difficult to communicate directly between mobile stations. Therefore, communication between mobile stations is performed via a fixed station having a fixed communication parameter. In this case, for example, satellite communication is performed using fixed communication parameters regardless of the mobile station parameters that change depending on the position of the mobile station. When performing satellite communication using a fixed communication parameter, there is a problem that the performance of the mobile station cannot be utilized and the efficiency of satellite communication of the mobile station is reduced.

  The present invention has been made in view of the above circumstances, and an object thereof is to improve the efficiency of satellite communication of a mobile station.

To achieve the above object, a satellite communication system of the present invention includes a fixed station and a mobile station, and control information communication and data communication between the fixed station and the mobile station and between the mobile stations are performed via the satellite. In the satellite communication system to be performed, the mobile station includes a mobile station transmission unit, a mobile station reception unit, a mobile station band setting unit, and a mobile station setting unit, and the fixed station includes a fixed station reception unit, a band determination unit, A communication parameter determination unit and a fixed station transmission unit are provided. The mobile station transmission unit allocates a band for allocation that is a set of bands reserved in advance to be allocated to the mobile station control communication band until a mobile station control communication band that is a band used for control information communication is allocated from the fixed station. using a predetermined band not included in, the control information communication, and transmits the mobile station, performance information, location information of a mobile station parameters and the mobile station includes at least one of the fault and configuration information to a solid Jokyoku. The mobile station reception unit receives information about the mobile station control communication band in a predetermined band, the fixed station transmits the control information communication, the frequency used by the mobile station for data communication, the modulation method, the transmission rate, and error correction. A communication parameter including at least one of the methods is received. The mobile station band setting unit sets a band used for control information communication in the mobile station transmission unit and the mobile station reception unit based on information on the mobile station control communication band. The mobile station setting unit sets data communication based on the communication parameters received by the mobile station receiving unit. The fixed station receiving unit receives mobile station parameters and position information transmitted by the mobile station through control information communication. The band determining unit determines a mobile station control communication band from the allocation bands based on the mobile station parameters and the position information received by the fixed station receiving unit. The communication parameter determining unit determines the communication parameter based on the mobile station parameter and the position information received by the fixed station receiving unit. The fixed station transmission unit transmits information about the mobile station control communication band to the mobile station by control information communication using a predetermined band, and transmits communication parameters to the mobile station by control information communication.

  According to the present invention, it is possible to improve the efficiency of satellite communication of a mobile station.

It is a block diagram which shows the structural example of the satellite communication system which concerns on Embodiment 1 of this invention. 2 is a diagram illustrating an arrangement example of a satellite communication system according to Embodiment 1. FIG. 6 is a diagram illustrating an example of frequency band allocation in the satellite repeater according to Embodiment 1. FIG. 6 is a flowchart showing an example of mobile station parameter and position information acquisition operations performed by the satellite communication system according to the first embodiment. 4 is a flowchart illustrating an example of communication parameter setting operation performed by the satellite communication system according to the first embodiment. 4 is a flowchart illustrating an example of communication parameter setting operation performed by the satellite communication system according to the first embodiment. It is a block diagram which shows the structural example of the satellite communication system which concerns on Embodiment 2 of this invention. 6 is a flowchart illustrating an example of a bandwidth setting operation for control information communication performed by the satellite communication system according to the second embodiment. It is a block diagram which shows the structural example of the satellite communication system which concerns on Embodiment 3 of this invention. 10 is a flowchart illustrating an example of an operation for setting a connection method for control information communication performed by the satellite communication system according to the third embodiment. It is a block diagram which shows the structural example of the satellite communication system which concerns on Embodiment 4 of this invention. 10 is a flowchart showing an example of a master station proxy operation performed by the satellite communication system according to the fourth embodiment. It is a block diagram which shows the physical structural example of the fixed station which concerns on embodiment of this invention, a mobile station, and a satellite.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent parts are denoted by the same reference numerals.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration example of a satellite communication system according to Embodiment 1 of the present invention. The satellite communication system 1 includes a fixed station 2, a mobile station 3, and a satellite 4. The fixed station 2 includes a fixed station receiving unit 21, a communication parameter determining unit 22, and a fixed station transmitting unit 23. The mobile station 3 is a communication device provided in a mobile body such as an aircraft or a ship. The mobile station 3 includes a mobile station transmission unit 31, a mobile station setting unit 32, and a mobile station reception unit 33. The satellite 4 includes a satellite transmission / reception unit 41 and a satellite setting unit 42. The satellite communication system 1 includes an arbitrary number of fixed stations 2, mobile stations 3, and satellites 4. Control information communication and data communication between the fixed station 2 and the mobile station 3 are performed via the satellite 4, and data communication between the plurality of mobile stations 3 is also performed via the satellite 4. The satellite transmission / reception unit 41 included in the satellite 4 performs signal transmission / reception and relay processing. The relay system of the satellite 4 is a non-regenerative relay system or a regenerative relay system.

  Control information communication performed between the fixed station 2 and the mobile station 3 will be described. The fixed station 2 and the mobile station 3 connect a CSC (Common Signaling Channel) line and perform control information communication. In the first embodiment, the fixed band 2 and the mobile station 3 are assigned the frequency band determined for the CSC line. The mobile station transmission unit 31 requests the fixed station 2 to connect a CSC line. The fixed station receiving unit 21 receives a request for connection of a CSC line, and the fixed station transmitting unit 23 includes at least one of performance information, failure information, and device setting information of the mobile station 3 in the mobile station 3. Request mobile station parameters and location information of mobile station 3.

  The performance information of the mobile station 3 is, for example, maximum EIRP (Equivalent Isotropic Radiated Power) and G / T (Gain to noise Temperature ratio), and the failure information is generated in each device of the mobile station 3, for example. The setting information is information about the setting in each device of the mobile station 3 that indicates, for example, the line used and the frequency. The mobile station reception unit 33 receives a request for mobile station parameters and position information, and the mobile station transmission unit 31 transmits the mobile station parameters and position information to the fixed station 2 by control information communication, that is, via a CSC line. The fixed station receiving unit 21 receives mobile station parameters and position information and sends them to the communication parameter determining unit 22.

  Communication between the mobile station transmission unit 31 and the fixed station reception unit 21 and between the fixed station transmission unit 23 and the mobile station reception unit 33 is performed via the satellite transmission / reception unit 41. The same applies to the following description. The fixed station 2 and the mobile station 3 can repeatedly acquire the latest mobile station parameters and position information by repeatedly performing the above-described processing at arbitrarily determined time intervals. The fixed station 2 includes a storage unit, stores mobile station parameters and position information in the storage unit, and updates the contents of the storage unit every time the fixed station reception unit 21 receives the mobile station parameters and position information. Also good.

  When the satellite communication system 1 includes a plurality of mobile stations 3, the plurality of mobile stations 3 perform the above-described processing with the fixed station 2, and the fixed station 2 determines the mobile station parameters and positions of each mobile station 3. Get information. For example, when the mobile station 3 starts data communication with another mobile station 3, the mobile station transmission unit 31 sends a request for data communication to the fixed station 2. When the fixed station receiving unit 21 receives a request for data communication with another mobile station 3, the fixed station transmitting unit 23 transmits a request for data communication from the mobile station 3 to the other mobile station 3. When the mobile station receiver 33 of another mobile station 3 receives the request for data communication and the other mobile station 3 responds to the request for data communication, the mobile station transmitter 31 of the other mobile station 3 Send response of communication request.

  When the fixed station receiving unit 21 of the fixed station 2 receives the response of the data communication request, the communication parameter determining unit 22 is based on the mobile station parameters and position information received by the fixed station receiving unit 21 in the above-described processing. For each of the mobile station 3 and the other mobile station 3, communication parameters including at least one of a frequency, a modulation method, a transmission rate, and an error correction method used for data communication are determined and transmitted to the fixed station transmitter 23. . The fixed station transmission unit 23 transmits communication parameters to the mobile station 3, other mobile stations 3, and the satellite 4.

  The mobile station receiving unit 33 of the mobile station 3 receives the communication parameter and sends it to the mobile station setting unit 32. The mobile station setting unit 32 sets data communication performed by the mobile station 3 based on the communication parameters. Similarly, the other mobile stations 3 perform data communication settings based on the communication parameters. The satellite transmission / reception unit 41 receives the communication parameter and sends it to the satellite setting unit 42. The satellite setting unit 42 sets data communication with the mobile station 3 and other mobile stations 3 based on the communication parameters.

  After optimal communication parameters are set by the control information communication described above, data communication between the mobile station 3 and another mobile station 3 is performed. The mobile station 3 and other mobile stations 3 perform data communication by modulating data signals and frequency conversion based on communication parameters, and the satellite 4 performs data communication relay processing based on the communication parameters. The efficiency of data communication between the mobile station 3 and other mobile stations 3 can be improved by changing at least one of the frequency, modulation method, transmission rate, and error correction method based on the mobile station parameters and the position information. It becomes possible. The mobile station 3 and the other mobile stations 3 can perform data communication based on the optimal communication parameters determined based on the mobile station parameters and the position information. When the data communication is terminated, the mobile station transmission unit 31 of the mobile station 3 transmits to the fixed station 2 that the data communication is terminated via the CSC line. Then, the data communication line is released.

  When the mobile station 3 performs data communication with the fixed station 2, the mobile station 3 transmits a data communication request to the fixed station 2, the fixed station 2 receives the data communication request, and sets communication parameters as described above. The communication parameter is transmitted to the mobile station 3 and the satellite 4. Then, the mobile station 3 and the satellite 4 set data communication based on the communication parameters. After the communication parameters are set, data communication between the mobile station 3 and the fixed station 2 is performed. The mobile station 3 can perform data communication with the fixed station 2 based on the optimum communication parameter determined based on the mobile station parameter and the position information. When the data communication is terminated, the mobile station transmission unit 31 transmits to the fixed station 2 that the data communication is terminated via the CSC line, and the data communication line is released.

  Note that, regardless of whether the mobile stations 3 or the mobile station 3 and the fixed station 2 are performing data communication, the mobile station 3 repeatedly performs the processing of the mobile station transmission unit 31, and the fixed station 2 performs the fixed station reception unit 21. This process may be repeated. While the data communication is being performed, the fixed station 2 can acquire the latest mobile station parameters and position information. In addition, since the above-described processing is repeated regardless of whether or not data communication is performed, the fixed station 2 maintains the latest mobile station parameters and position even after the data communication is completed and the data communication line is released. Information can be acquired.

  Regardless of whether or not the mobile stations 3 or the mobile station 3 and the fixed station 2 perform data communication, the mobile station 3 performs the processing of the mobile station transmission unit 31, the mobile station setting unit 32, and the mobile station reception unit 33. The fixed station 2 may repeatedly perform the processing of the fixed station receiving unit 21, the communication parameter determining unit 22, and the fixed station receiving unit 23, and the satellite 4 may repeatedly perform the processing of the satellite setting unit 42. Even during the data communication, the communication parameter of the data communication can be changed according to the change of the mobile station parameter and the position information of the mobile station 3.

  When the fixed station receiving unit 21 receives a CSC line connection request, the fixed station transmitting unit 23 sends the mobile station parameters and position information to the mobile station 3 until receiving the mobile station parameters and position information from the mobile station 3. Information requests may be transmitted at arbitrarily determined intervals. In this case, if the time during which the mobile station parameters and location information are not received from the mobile station 3 is equal to or greater than the threshold, the fixed station receiver 21 stops transmitting the mobile station parameter and location information request. . If the satellite 4 does not need to set data communication based on the communication parameters, the fixed station 2 may transmit the communication parameters only to the mobile station 3, and the satellite 4 may not include the satellite setting unit 42. .

  FIG. 2 is a diagram illustrating an arrangement example of the satellite communication system according to the first embodiment. The satellite communication system 1 includes fixed stations 2a and 2b, mobile stations 3a, 3b and 3c, and satellites 4a and 4b. The beam ranges 5a, 5b and 5c of the satellite 4a are indicated by dotted lines. As shown in FIG. 2, for example, communication between the fixed station 2a and each of the mobile stations 3a and 3b and communication between the mobile stations 3a and 3b are performed via the satellite 4a.

  Control information communication will be described by taking as an example a case of controlling a frequency used for data communication among communication parameters. FIG. 3 is a diagram illustrating an example of frequency band allocation in the satellite repeater according to the first embodiment. For example, as shown in FIG. 3, the frequency used by the repeater provided in the satellite 4a is divided into a CSC line band A, a CSC line band B, and a data communication band. A plurality of channels are defined in each of the CSC line band A, the CSC line band B, and the data communication band. In the example of FIG. 3, channels A1 to A6 and channels B1 to B6 are control bands. For example, the fixed station 2a transmits control information to the satellite 4a using the channel A1, and receives control information from the satellite 4a using the channel A2. The fixed station 2a and the satellite 4a perform control information communication using the channels A1 and A2.

  For example, assume that channels A3 to A6 and channels B1 to B4 are bands reserved for control information communication of the mobile station, and channels A3 and A4 are allocated to the mobile station 3a. The mobile station 3a located within the beam range 5b of the satellite 4a transmits control information to the satellite 4a using, for example, the channel A3, and receives control information from the satellite 4a using the channel A4. The mobile station 3a and the satellite 4a perform control information communication using channels A3 and A4. Also assume that channels A5 and A6 are allocated to the mobile station 3b. The mobile station 3b located within the beam range 5b of the satellite 4a transmits control information to the satellite 4a using, for example, the channel A5, and receives control information from the satellite 4a using the channel A6. The mobile station 3b and the satellite 4a perform control information communication using channels A5 and A6. The satellite 4a performs a relay process to realize control information communication between the fixed station 2a and each of the mobile stations 3a and 3b. The fixed station 2a acquires mobile station parameters and position information of the mobile stations 3a and 3b.

  A case will be described as an example where each of the mobile stations 3a and 3b and the fixed station 2a are connected to a CSC line, and the mobile station 3a requests data communication with the mobile station 3b. The fixed station receiving unit 21 included in the fixed station 2a receives the data communication request and transmits the data communication request to the mobile station 3b. When the mobile station 3b responds to the request for data communication, the communication parameter determination unit 22 uses, for example, a band used for data transmission from the mobile station 3a to the mobile station 3b based on the mobile station parameter and the position information as the channel D1. Then, the communication parameter is determined using the band used for data transmission from the mobile station 3b to the mobile station 3a as the channel D2. The fixed station transmission unit 23 transmits communication parameters to the mobile stations 3a and 3b and the satellite 4a. The mobile station receiving unit 33 included in the mobile stations 3a and 3b receives communication parameters, and the mobile station setting unit 32 sets data communication based on the communication parameters. The satellite transmission / reception unit 41 included in the satellite 4a receives communication parameters, and the satellite setting unit 42 sets data communication with the mobile stations 3a and 3b based on the communication parameters.

  Thereafter, the mobile stations 3a and 3b perform data communication using the channels D1 and D2. The mobile stations 3a and 3b can perform data communication based on appropriate communication parameters. When the data communication is terminated, the mobile station transmission unit 31 of the mobile station 3a transmits a message indicating that the data communication is terminated to the fixed station 2a, and the data communication line is released.

  FIG. 4 is a flowchart showing an example of an operation of acquiring mobile station parameters and position information performed by the satellite communication system according to the first embodiment. In order to facilitate understanding, description of relay processing performed by the satellite was omitted. The mobile station transmission unit 31 requests the fixed station 2 to connect the CSC line (step S110). The fixed station receiving unit 21 determines whether or not a request for connection of the CSC line has been received (step S210). If the request for connection of the CSC line has not been received (step S210; N), step S210 is repeated. When a request for connection of a CSC line is received (step S210; Y), the fixed station transmission unit 23 requests the mobile station 3 for mobile station parameters and position information (step S220).

  The mobile station receiving unit 33 determines whether or not a request for mobile station parameters and position information has been received (step S120). If a request for mobile station parameters and location information has not been received (step S120; N), step S120 is repeated. When a request for mobile station parameters and position information is received (step S120; Y), the mobile station transmitter 31 transmits the mobile station parameters and position information to the fixed station 2 (step S130). The fixed station receiving unit 21 included in the fixed station 2 receives the mobile station parameters and the position information and sends them to the communication parameter determining unit 22 (step S230). The fixed station 2 and the mobile station 3 repeat the above process.

  FIG. 5 is a flowchart showing an example of communication parameter setting operation performed by the satellite communication system according to the first embodiment. In order to facilitate understanding, description of relay processing performed by the satellite was omitted. A case where the mobile station 3 performs data communication with another mobile station 3 will be described as an example. The fixed station 2, the mobile station 3, and each of the other mobile stations 3 perform the processing shown in FIG. 4, and the fixed station 2 acquires the mobile station parameters and position information of the mobile station 3 and the other mobile stations 3.

  The mobile station transmission unit 31 sends a data communication request to the fixed station 2 (step S310). The fixed station receiving unit 21 determines whether or not a request for data communication to another mobile station 3 has been received (step S410). If a request for data communication to another mobile station 3 has not been received (step S410; N), step S410 is repeated. When the data communication request to the other mobile station 3 is received (step S410; Y), the fixed station transmission unit 23 transmits the data communication request to the other mobile station 3 (step S420).

  The mobile station receivers 33 of other mobile stations 3 determine whether or not a data communication request has been received (step S510). If a request for data communication has not been received (step S510; N), step S510 is repeated. When the data communication request is received (step S510; Y), the mobile station transmitters 31 of the other mobile stations 3 transmit a response to the data communication request to the fixed station 2 (step S520).

  The fixed station receiving unit 21 determines whether a response to the data communication request has been received (step S430). If a response to the data communication request has not been received (step S430; N), step S430 is repeated. When a response to the data communication request is received (step S430; Y), the communication parameter determination unit 22 determines the mobile station 3 and other mobile stations based on the mobile station parameters and position information received by the fixed station reception unit 21. The communication parameters used by the station 3 for data communication are determined (step S440). The fixed station transmission unit 23 transmits the communication parameters to the mobile station 3, the other mobile station 3, and the satellite 4 (step S450).

  The mobile station reception unit 33 determines whether or not a communication parameter has been received (step S320). If no communication parameter has been received (step S320; N), step S320 is repeated. When the communication parameter is received (step S320; Y), the mobile station setting unit 32 sets data communication based on the communication parameter (step S330). Similarly, the mobile station receivers 33 of the other mobile stations 3 determine whether or not communication parameters have been received (step S530). If the communication parameter has not been received (step S530; N), step S530 is repeated. When the communication parameter is received (step S530; Y), the mobile station setting unit 32 of the other mobile station 3 sets data communication based on the communication parameter (step S540).

  The satellite transmission / reception unit 41 determines whether a communication parameter has been received (step S610). If the communication parameter has not been received (step S610; N), step S610 is repeated. When the communication parameter is received (step S610; Y), the satellite setting unit 42 sets data communication with the mobile station 3 and the other mobile station 3 based on the communication parameter (step S620). Then, the mobile station 3 and the other mobile station 3 perform data communication (steps S340 and S550). Note that the mobile station 3, the fixed station 2, the other mobile station 3, and the satellite 4 may repeatedly perform communication parameter determination and setting processing among the above processing even during data communication.

  FIG. 6 is a flowchart showing an example of communication parameter setting operation performed by the satellite communication system according to the first embodiment. In order to facilitate understanding, description of relay processing performed by the satellite was omitted. A case where the mobile station 3 performs data communication with the fixed station 2 will be described as an example. The processing in step S310 is the same as that in FIG. The fixed station receiving unit 21 determines whether or not a request for data communication to the fixed station 2 has been received (step S411). If a request for data communication has not been received (step S411; N), step S411 is repeated. When a request for data communication is received (step S411; Y), the communication parameter determination unit 22 performs communication used by the mobile station 3 for data communication based on the mobile station parameters and position information received by the fixed station reception unit 21. A parameter is determined (step S440). The fixed station transmission unit 23 transmits communication parameters to the mobile station 3 and the satellite 4 (step S450). The processes in steps S320, S330, S610, and S620 are the same as those in FIG. The mobile station 3 and the fixed station 2 perform data communication (steps S340 and S460).

  As described above, according to the satellite communication system 1 according to the first embodiment, the efficiency of the satellite communication of the mobile station 3 can be improved.

(Embodiment 2)
FIG. 7 is a block diagram showing a configuration example of the satellite communication system according to Embodiment 2 of the present invention. In the satellite communication system 1 according to the second embodiment, in addition to the configuration of the satellite communication system 1 according to the first embodiment, the fixed station 2 further includes a band determining unit 24, and the mobile station 3 includes a mobile station band setting unit 34. In addition, the satellite 4 further includes a satellite band setting unit 43. As in the first embodiment, in FIG. 3, channels A1 to A6 and channels B1 to B6 are control bands, and channels A1 and A2 are bands reserved for control information communication of fixed stations. Channels A3 to A6 and channels B1 to B4 are bands reserved for mobile station control information communication. However, in the second embodiment, the frequency band predetermined for the CSC line is not assigned to each mobile station 3.

  The case where the mobile station 3c outside the beam range in FIG. 2 moves and enters the beam range 5c will be described as an example. After the mobile station 3c enters the communication range of the satellite 4a, until the band used for control information communication is allocated from the fixed station 2a, the mobile station 3c has a predetermined band different from the band reserved for control information communication, that is, Channels B5 and B6 in FIG. 3 are used for control information communication.

  The mobile station transmission unit 31 provided in the mobile station 3c requests the fixed station 2a to connect the CSC line using, for example, the channel B5. The fixed station receiving unit 21 included in the fixed station 2a receives a request for connection of a CSC line using, for example, the channel A2, and the fixed station transmitting unit 23 sends the mobile station parameters and the mobile station parameters and the mobile station 3c using, for example, the channel A1. Request location information. The mobile station reception unit 33 receives a request for mobile station parameters and location information using channel B6. The mobile station transmission unit 31 transmits the mobile station parameters and the position information to the fixed station 2a using the channel B5.

  The fixed station receiving unit 21 receives the mobile station parameters and the position information using the channel A 2 and sends them to the band determining unit 24. The band determination unit 24 determines a band used for control information communication of the mobile station 3c, out of bands reserved for control information communication, based on the mobile station parameters and position information. The band determining unit 24 determines, for example, channels B3 and B4 among the channels A3 to A6 and channels B1 to B4 as bands used for control information communication of the mobile station 3c. The band determination unit 24 sends information about a band used for control information communication of the mobile station 3 c to the fixed station transmission unit 23. The fixed station transmission unit 23 transmits information about a band used for control information communication of the mobile station 3c to the mobile station 3c and the satellite 4a using the channel A1. Using the channel B6, the mobile station receiving unit 33 receives information about the band used for control information communication of the mobile station 3c, that is, the fact that the channels B3 and B4 are used for control information communication.

  The mobile station receiving unit 33 sends information about a band used for control information communication to the mobile station band setting unit 34. Based on the received information about the band used for control information communication, the mobile station band setting unit 34 sets the bands used for control information communication by the mobile station transmission unit 31 and the mobile station reception unit 33 to channels B3 and B4.

  The satellite transmission / reception unit 41 included in the satellite 4 a receives information about a band used for control information communication and sends the information to the satellite band setting unit 43. The satellite band setting unit 43 sets the bands used for control information communication with the mobile station 3c in the satellite transmission / reception unit 41 to the channels B3 and B4 based on the received information about the band used for control information communication.

  Thereafter, the mobile station 3c performs control information communication using the channels B3 and B4 as in the first embodiment. The fixed station 2a determines the band to be used for the control information communication of the mobile station 3c based on the mobile station parameter and the position information, so that the efficiency of the control information communication of the mobile station 3c can be improved. In the above-described example, when the mobile station 3c enters the beam range 5c from the outside of the beam range 5c of the satellite 4a, the mobile station 3c keeps the control information communication until the band used for control information communication is allocated from the fixed station 2a. For example, when the mobile station 3c exists in the beam range 5c of the satellite 4a but the satellite communication is resumed from the state where the satellite communication is stopped In addition, the above-described processing may be performed.

  When the fixed station receiving unit 21 receives the request for connection of the CSC line, the fixed station transmitting unit 23 sends the mobile station parameters and position to the mobile station 3c until receiving the mobile station parameters and position information from the mobile station 3c. Information requests may be transmitted at arbitrarily determined intervals. In this case, if the mobile station 3c moves out of the beam range 5c of the satellite 4a and out of the beam range 5c, the fixed station receiver 21 cannot receive the mobile station parameters and position information from the mobile station. Therefore, the fixed station receiving unit 21 stops transmitting the request for the mobile station parameter and the position information when the time during which the mobile station parameter and the position information are not received from the mobile station is equal to or greater than the threshold value.

  Thereafter, when the mobile station 3c enters the beam range of the satellite 4b, the mobile station 3c is the band reserved for control information communication until the band used for control information communication is allocated from the fixed station 2b. Control information communication is performed with the fixed station 2b using different predetermined bands. When a band used for control information communication is allocated from the fixed station 2b, the mobile station 3c performs control information communication with the fixed station 2b using the band.

  FIG. 8 is a flowchart showing an example of a bandwidth setting operation for control information communication performed by the satellite communication system according to the second embodiment. The mobile station transmission unit 31 requests the fixed station 2 to connect the CSC line using a predetermined band different from the band reserved for control information communication (step S710). The fixed station reception unit 21 determines whether or not a request for connection of the CSC line has been received (step S810). If the request for connection of the CSC line has not been received (step S810; N), the process of step S810 is repeated. When the request for connection of the CSC line is received (step S810; Y), the fixed station transmission unit 23 requests the mobile station 3 for mobile station parameters and position information (step S820).

  The mobile station reception unit 33 determines whether a request for mobile station parameters and position information has been received using a predetermined band different from the band reserved for control information communication (step S720). If a request for mobile station parameters and location information has not been received (step S720; N), the process of step S720 is repeated. When a request for mobile station parameters and position information is received (step S720; Y), the mobile station transmission unit 31 uses a predetermined band that is different from the band reserved for control information communication. The parameter and position information are transmitted to the fixed station 2 (step S730).

  The fixed station receiving unit 21 determines whether or not the mobile station parameters and the position information are received (step S830). When the mobile station parameter and the position information are not received (step S830; N), the process of step S830 is repeated. When the mobile station parameter and the position information are received (step S830; Y), the band determining unit 24 determines the mobile station 3 out of the band reserved for control information communication based on the mobile station parameter and the position information. The bandwidth used for the control information communication is determined (step S840). The fixed station transmission unit 23 transmits information about a band used for control information communication of the mobile station 3 to the mobile station 3 and the satellite 4 (step S850).

  The mobile station receiving unit 33 determines whether or not information on a band used for control information communication of the mobile station 3 has been received using a band not allocated to control information communication (step S740). When the information about the band used for control information communication is not received (step S740; N), the process of step S740 is repeated. When the information about the band used for control information communication is received (step S740; Y), the mobile station band setting unit 34, based on the received information about the band used for control information communication, A band used for control information communication is set by the mobile station receiver 33 (step S750).

  The satellite transmission / reception unit 41 determines whether or not information about a band used for control information communication has been received (step S910). When the information about the band used for control information communication has not been received (step S910; N), the process of step S910 is repeated. When the information about the band used for control information communication is received (step S910; Y), the satellite band setting unit 43 uses the satellite transmission / reception unit 41 to move the mobile station based on the received information about the band used for control information communication. The bandwidth used for the control information communication with 3 is set (step S920).

  As described above, according to the satellite communication system 1 according to Embodiment 2, the efficiency of the satellite communication of the mobile station 3 is improved by setting the band used for the control information communication based on the mobile station parameter and the position information. It becomes possible.

(Embodiment 3)
FIG. 9 is a block diagram showing a configuration example of the satellite communication system according to Embodiment 3 of the present invention. In the satellite communication system 1 according to the third embodiment, in addition to the configuration of the satellite communication system 1 according to the first embodiment, the fixed station further includes a connection determination unit 25 and a fixed station connection setting unit 26, and the mobile station is a mobile station. A connection setting unit 35 is further provided, and the satellite 4 further includes a satellite connection setting unit 44. In the satellite communication system 1 according to Embodiment 3, the connection method of the CSC connection line is changed based on the mobile station parameters and the position information.

  As in the first embodiment, the fixed station receiving unit 21 receives mobile station parameters and position information. The fixed station receiving unit 21 sends the received mobile station parameters and position information to the communication parameter determining unit 22 and the connection determining unit 25. Based on the mobile station parameters and the location information, the connection determination unit 25 determines the connection method of the CSC connection line as TDMA (Time Division Multiple Access), FDMA (Frequency-Division Multiple Access), And CDMA (Code Division Multiple Access), and sends it to the fixed station transmission unit 23 and the fixed station connection setting unit 26.

  The fixed station transmission unit 23 transmits the connection method of the CSC connection line to the mobile station 3 and the satellite 4. The fixed station connection setting unit 26 sets the connection method of the CSC connection line in the fixed station reception unit 21 and the fixed station transmission unit 23. The mobile station receiving unit 33 receives the connection method of the CSC connection line and sends it to the mobile station connection setting unit 35. The mobile station connection setting unit 35 sets the connection method of the CSC connection line in the mobile station transmission unit 31 and the mobile station reception unit 33 based on the connection method. The satellite transmission / reception unit 41 receives the connection method of the CSC connection line and sends it to the satellite connection setting unit 44. The satellite connection setting unit 44 sets the connection method of the CSC connection line in the satellite transmission / reception unit 41 based on the connection method.

  By changing the connection method of the CSC connection line based on the mobile station parameters and the position information, it is possible to improve the efficiency of control information communication.

  FIG. 10 is a flowchart showing an example of a connection method setting operation of control information communication performed by the satellite communication system according to the third embodiment. Steps S110 to S130 and steps S210 to S220 are the same as the operations of steps S110 to S130 and steps S210 to S220 performed by the satellite communication system 1 according to the first embodiment shown in FIG.

  The fixed station receiving unit 21 determines whether or not the mobile station parameters and position information have been received (step S240). When the mobile station parameter and the position information are not received (step S240; N), step S240 is repeated. When the mobile station parameter and the position information are received (step S240; Y), the connection determination unit 25 sets the connection method of the CSC connection line among TDMA, FDMA, and CDMA based on the mobile station parameter and the position information. , One of them is determined (step S250). The fixed station transmission unit 23 transmits the connection method of the CSC connection line to the mobile station 3 and the satellite 4 (step S260). The fixed station connection setting unit 26 sets the connection method of the CSC connection line in the fixed station receiving unit 21 and the fixed station transmitting unit 23 (step S270).

  The mobile station reception unit 33 determines whether or not the connection method of the CSC connection line has been received (step S140). If the connection method of the CSC connection line has not been received (step S140; N), step S140 is repeated. When the connection method of the CSC connection line is received (step S140; Y), the mobile station connection setting unit 35 connects the connection method of the CSC connection line in the mobile station transmission unit 31 and the mobile station reception unit 33 based on the connection method. Is set (step S150).

  The satellite transmission / reception unit 41 determines whether or not the connection method of the CSC connection line has been received (step S1010). If the connection method of the CSC connection line has not been received (step S1010; N), step S1010 is repeated. When the connection method of the CSC connection line is received (step S1010; Y), the satellite connection setting unit 44 sets the connection method of the CSC connection line in the satellite transmission / reception unit 41 based on the connection method (step S1020).

  The fixed station 2, the mobile station 3, and the satellite 4 repeat the above processing.

  As described above, according to the satellite communication system 1 according to the third embodiment, the efficiency of control information communication in the satellite communication system 1 is improved by changing the connection method of the CSC connection line based on the mobile station parameters and the position information. It becomes possible to improve.

(Embodiment 4)
FIG. 11 is a block diagram showing a configuration example of a satellite communication system according to Embodiment 4 of the present invention. A satellite communication system 1 according to Embodiment 4 includes a plurality of fixed stations 2 and a storage device 6. Further, one fixed station 2 among the plurality of fixed stations 2 is determined as a master station. The fixed station 2 shown in FIG. 11 is a master station. The fixed station 2 serving as a master station includes an intercommunication unit 27 and an update unit 28 in addition to the configuration of the fixed station 2 of the satellite communication system 1 according to the first embodiment. The storage device 6 stores mobile station parameters and position information.

  As in the first embodiment, the fixed station receiving unit 21 receives mobile station parameters and position information. The fixed station reception unit 21 sends the received mobile station parameters and position information to the communication parameter determination unit 22, the mutual communication unit 27, and the update unit 28. The mutual communication unit 27 receives the mobile station parameters and position information received from the mobile station 3 by the other fixed station 2 from the other fixed station 2 and sends them to the update unit 28. In addition, the mutual communication unit 27 uses the mobile station parameters and position information received by the fixed station reception unit 21 or the mobile station parameters and position information stored in the storage device 6 acquired by the update unit 28 as other fixed stations 2. Send to. Each fixed station 2 can share the latest mobile station parameters and location information. The updating unit 28 updates the contents of the storage device 6 based on the mobile station parameters and position information received from the mobile station 3 and the mobile station parameters and position information received from the other fixed station 2 by the mutual communication unit 27. .

  In addition, each fixed station 2 includes the updating unit 28, and when the parent station is not operating normally, another fixed station 2 that has been defined may perform the operation of the parent station. For example, the fixed station 2 that is not the master station determines that the master station is not operating normally when the time during which the signal is not received from the master station exceeds the threshold in the intercommunication unit 27, and the other fixed station 2 The station 2 may be notified that it is a master station, and the storage device 6 may be updated by acting as a master station. Other fixed stations 2 acting as the master station can be arbitrarily determined. For example, priority may be set for each fixed station 2, and when the parent station is not operating normally, another fixed station 2 having a higher priority may perform the operation of the parent station.

  FIG. 12 is a flowchart showing an example of the operation of the master station proxy performed by the satellite communication system according to the fourth embodiment. The fixed station 2 that is not the parent station determines whether or not the parent station is operating normally (step S1110). If it is determined that the master station is operating normally (step S1110; Y), step S1110 is repeated. If it is determined that the parent station is not operating normally (step S1110; N), the operation of the parent station is performed (step S1120).

  As described above, according to the satellite communication system 1 according to the fourth embodiment, the latest mobile station parameters and position information are stored in the storage device even when the fixed station 2 serving as the master station stops operating normally. 6 can be stored.

  Embodiment of this invention is not restricted to the above-mentioned embodiment, You may comprise by what combined several forms arbitrarily from the above-mentioned embodiment.

  FIG. 13 is a block diagram illustrating a physical configuration example of a fixed station, a mobile station, and a satellite according to the embodiment of the present invention. The fixed station 2, the mobile station 3, and the satellite 4 include a control unit 71, a main storage unit 72, an external storage unit 73, an input / output unit 74, and a transmission / reception unit 75. The main storage unit 72, external storage unit 73, input / output unit 74, and transmission / reception unit 75 are all connected to the control unit 71 via the internal bus 70.

  The control unit 71 includes a CPU (Central Processing Unit) and the like, and performs processing for output data control performed by the fixed station 2, the mobile station 3, and the satellite 4 in accordance with a control program 76 stored in the external storage unit 73. Run. The main storage unit 72 is composed of a RAM (Random-Access Memory) or the like, loads a control program 76 stored in the external storage unit 73, and is used as a work area of the control unit 71.

  The external storage unit 73 includes a nonvolatile memory such as a flash memory, a hard disk, a DVD-RAM (Digital Versatile Disc Random-Access Memory), a DVD-RW (Digital Versatile Disc ReWritable), and the processing described above is performed by the control unit 71. A control program 76 to be executed is stored in advance, and data stored in the control program 76 is supplied to the control unit 71 in accordance with an instruction from the control unit 71, and the data supplied from the control unit 71 is stored.

  The input / output unit 74 includes a serial interface or a parallel interface. For example, the storage device 6 can be connected to the input / output unit 74.

  The transceiver unit 75 includes a transceiver and an interface connected to the transceiver.

  The processing of each part of the fixed station 2, the mobile station 3 and the satellite 4 shown in FIG. 1, FIG. 7, FIG. 9 and FIG. 11 is performed by the control program 76, the control unit 71, the main storage unit 72, the external storage unit 73, The processing is executed by using the output unit 74, the transmission / reception unit 75, and the like as resources.

  In addition, the hardware configuration and the flowchart described above are merely examples, and can be arbitrarily changed and modified.

  A central part that performs control processing including the control unit 71, the main storage unit 72, the external storage unit 73, the internal bus 70, and the like can be realized by using a normal computer system without using a dedicated system. . For example, a computer program for executing the above operation is stored and distributed in a computer-readable recording medium (flexible disk, CD-ROM, DVD-ROM, etc.), and the computer program is installed in the computer. Thus, the fixed station 2, the mobile station 3, and the satellite 4 that execute the above-described processing may be configured. Further, the fixed station 2, the mobile station 3, and the satellite 4 may be configured by storing the computer program in a storage device included in a server device on a communication network such as the Internet and downloading it by a normal computer system. Good.

  When the functions of the fixed station 2, the mobile station 3, and the satellite 4 are realized by sharing the OS (operating system) and the application program, or in cooperation with the OS and the application program, only the application program part is provided. You may store in a recording medium or a memory | storage device.

  It is also possible to superimpose a computer program on a carrier wave and distribute it via a communication network. For example, the computer program may be posted on a bulletin board (BBS: Bulletin Board System) on a communication network, and the computer program may be distributed via the network. The computer program may be started and executed in the same manner as other application programs under the control of the OS, so that the above-described processing may be executed.

  1 Satellite communication system 2, 2a, 2b Fixed station 3, 3a, 3b, 3c Mobile station 4, 4a, 4b Satellite, 5a, 5b, 5c Beam range, 6 Storage device, 21 Fixed station receiver, 22 Communication Parameter determining unit, 23 Fixed station transmitting unit, 24 Band determining unit, 25 Connection determining unit, 26 Fixed station connection setting unit, 27 Intercommunication unit, 28 Updating unit, 31 Mobile station transmitting unit, 32 Mobile station setting unit, 33 Moving Station receiving unit, 34 Mobile station band setting unit, 35 Mobile station connection setting unit, 41 Satellite transmission / reception unit, 42 Satellite setting unit, 43 Satellite band setting unit, 44 Satellite connection setting unit, 70 Internal bus, 71 Control unit, 72 Main Storage unit 73 External storage unit 74 Input / output unit 75 Transmission / reception unit 76 Control program.

Claims (14)

A satellite communication system comprising a fixed station and a mobile station, wherein control information communication and data communication between the fixed station and the mobile station and between the mobile stations are performed via a satellite,
The mobile station
Until a mobile station control communication band that is a band used for the control information communication is allocated from the fixed station, it is included in an allocation band that is a set of bands reserved in advance to be allocated to the mobile station control communication band. with no predetermined band transmission, at the control information communication, the mobile station, performance information, location information of a mobile station parameter and the mobile station includes at least one of the fault and configuration information before Symbol fixed station A mobile station transmitter to
Information about the mobile station control communication band is received in the predetermined band, the fixed station transmits the control information communication, the frequency used by the mobile station for data communication, a modulation method, a transmission rate, and an error correction method A mobile station receiver that receives communication parameters including at least one of:
Based on information about the mobile station control communication band, a mobile station band setting unit that sets a band used for the control information communication in the mobile station transmission unit and the mobile station reception unit;
Based on the communication parameters received by the mobile station receiver, a mobile station setting unit for setting data communication,
The fixed station is
A fixed station receiver that receives the mobile station parameters and the location information transmitted by the mobile station in the control information communication;
Based on the mobile station parameters and the position information received by the fixed station receiver, a band determining unit that determines the mobile station control communication band from the allocation bands,
A communication parameter determination unit that determines the communication parameter based on the mobile station parameter and the position information received by the fixed station reception unit;
A fixed station transmitter that transmits information about the mobile station control communication band to the mobile station by the control information communication using the predetermined band, and transmits the communication parameters to the mobile station by the control information communication; Comprising
Satellite communication system. The fixed station is
A connection determination unit that determines a connection method of the control information communication based on the mobile station parameter and the position information received by the fixed station reception unit;
A fixed station connection setting unit that sets a connection method of the control information communication in the fixed station receiver and the fixed station transmitter based on the connection method;
The fixed station transmitter transmits information about the connection method to the mobile station,
The mobile station receiver receives information about the connection method transmitted by the fixed station,
The mobile station
Based on the information about the connection method received by the mobile station reception unit, further comprising a mobile station connection setting unit for setting a connection method of the control information communication in the mobile station reception unit and the mobile station transmission unit,
The satellite communication system according to claim 1 . The fixed station transmission unit transmits the mobile station parameter and the position information request to the mobile station at an arbitrarily determined interval until the mobile station parameter and the position information are received from the mobile station, and the mobile station If the time during which the mobile station parameter and the location information are not received is equal to or greater than a threshold, the transmission of the request is stopped,
The mobile station receiving unit receives the request for the mobile station parameters and the location information transmitted by the fixed station,
The mobile station transmitter, when the mobile station receiver receives the request, transmits the mobile station parameters and the location information to the fixed station;
The satellite communication system according to claim 1 or 2 . Regardless of whether the mobile stations or the mobile station and the fixed station are performing data communication,
The mobile station repeatedly performs the processing of the mobile station transmission unit,
The fixed station repeatedly performs the processing of the fixed station receiver.
The satellite communication system according to any one of claims 1 to 3 . Regardless of whether the mobile stations or the mobile station and the fixed station are performing data communication,
The mobile station repeatedly performs the processing of the mobile station transmitter, the mobile station receiver, and the mobile station setting unit,
The fixed station repeatedly performs the processes of the fixed station receiving unit, the communication parameter determining unit, and the fixed station transmitting unit.
The satellite communication system according to any one of claims 1 to 3 . Comprising a plurality of said fixed stations,
A storage device for storing the mobile station parameter and the location information;
The fixed station is
Further comprising an intercommunication unit that transmits and receives the mobile station parameters and the location information with the other fixed station,
Among the plurality of fixed stations, a fixed station that is a master station is:
An update unit that updates the mobile station parameter and the location information stored in the storage device based on the mobile station parameter and the location information received from the mobile station or another fixed station;
The satellite communication system according to any one of claims 1 to 5 . Comprising a plurality of said fixed stations,
A storage device for storing the mobile station parameter and the location information;
The fixed station is
An intercommunication unit that transmits and receives the mobile station parameters and the location information with the other fixed stations;
An update unit that updates the mobile station parameters and the location information stored in the storage device based on the mobile station parameters and the location information received from the mobile station or the other fixed station;
Among the plurality of fixed stations, a fixed station that is a master station is:
Perform the update unit processing,
Among the plurality of fixed stations, a fixed station that is not a master station is:
Communicate with the master station at an arbitrarily determined interval, and when it is determined that the master station is not operating normally based on the communication with the master station, a fixed station that is not the master station is determined. The fixed station becomes the master station and performs the processing of the update unit.
The satellite communication system according to any one of claims 1 to 5 . The satellite communication control method includes a fixed station and a mobile station, and control information communication and data communication between the fixed station and the mobile station and between the mobile stations are performed by a satellite communication system performed via a satellite. And
Information acquisition step of acquiring mobile station parameters including at least one of performance information, failure information and setting information of the mobile station and position information of the mobile station;
Based on the mobile station parameter and the location information, the mobile station control is selected from among allocation bands that are a set of bands that are reserved in advance to be allocated to a mobile station control communication band that is a band used for the control information communication. A bandwidth determination step for determining a communication bandwidth;
A communication parameter determining step for determining a communication parameter including at least one of a frequency, a modulation scheme, a transmission rate, and an error correction scheme used by the mobile station for data communication based on the mobile station parameter and the position information;
Based on information about the mobile station control communication band, performs band settings used for the control information communication in the mobile station, based on the communication parameters, the mobile station setting step of performing said data communication setting in the mobile station ,
A satellite communication control method comprising: The mobile station of the satellite communication system, comprising a fixed station and a mobile station, control information communication and data communication between the fixed station and the mobile station and between the mobile stations is performed via a satellite,
Until a mobile station control communication band that is a band used for the control information communication is allocated from the fixed station, it is included in an allocation band that is a set of bands reserved in advance to be allocated to the mobile station control communication band. with no predetermined band, with the control information communication, the mobile station to transmit performance information of its own station, the location information of the mobile station parameters and the own station containing at least one of the fault and configuration information before Symbol fixed station A transmission unit;
Information on the mobile station control communication band determined by the fixed station based on the mobile station parameter and the position information is received in the control information communication using the predetermined band, and the mobile station parameter and the position information are received. A mobile station receiver that receives communication parameters including at least one of a frequency, a modulation method, a transmission rate, and an error correction method used for data communication determined by the fixed station from the fixed station through the control information communication, ,
Based on information about the mobile station control communication band, a mobile station band setting unit that sets a band used for the control information communication in the mobile station transmission unit and the mobile station reception unit;
Based on the communication parameters received by the mobile station reception unit, a mobile station setting unit for setting data communication,
A mobile station comprising: Mobile station connection setting for setting the connection method of the control information communication in the mobile station receiving unit and the mobile station transmitting unit based on information about the connection method set by the fixed station by the mobile station parameter and the location information Further comprising
The mobile station receiving unit receives information about the connection method from the fixed station through the control information communication.
The mobile station according to claim 9 . A fixed station and a mobile station, the control information communication and the data communication between the fixed station and the mobile station and between the mobile stations, the fixed station of the satellite communication system performed via a satellite,
Until a mobile station control communication band that is a band used for the control information communication of the mobile station is allocated, it is included in an allocation band that is a set of bands reserved in advance to be allocated to the mobile station control communication band. the mobile station at a predetermined band is transmitted without, the performance information of the mobile station, the location information of the mobile station parameter and the mobile station includes at least one of the fault and configuration information, received before Symbol control information communication A fixed station receiver;
Based on the mobile station parameters and the location information received by the fixed station receiver, a band determining unit that determines the mobile station control communication band from the allocation bands;
A communication parameter determination unit that determines communication parameters including at least one of a frequency, a modulation scheme, a transmission rate, and an error correction scheme used by the mobile station for data communication based on the mobile station parameter and the position information;
A fixed station transmitter that transmits information about the mobile station control communication band to the mobile station using the predetermined band in the control information communication, and transmits the communication parameter to the mobile station in the control information communication;
Fixed station with. A connection determination unit that determines a connection method of the control information communication based on the mobile station parameter and the position information received by the fixed station reception unit;
A fixed station connection setting unit that sets a connection method of the control information communication in the fixed station receiver and the fixed station transmitter based on the connection method;
The fixed station transmitter transmits information about the connection method to the mobile station;
The fixed station according to claim 11 . A computer comprising a fixed station and a mobile station, wherein control information communication and data communication between the fixed station and the mobile station and between the mobile stations are performed via a satellite to control the mobile station of the satellite communication system In addition,
Until a mobile station control communication band that is a band used for the control information communication is allocated from the fixed station, it is included in an allocation band that is a set of bands reserved in advance to be allocated to the mobile station control communication band. with no predetermined band, the step of transmitting by the control information communication, the performance information of its own station, the location information of the mobile station parameter and the mobile station includes at least one of the fault and configuration information before Symbol fixed station When,
Information on the mobile station control communication band determined by the fixed station based on the mobile station parameter and the position information is received in the control information communication using the predetermined band, and the fixed station receives the mobile station parameter. And receiving communication parameters including at least one of a frequency used in data communication, a modulation method, a transmission rate, and an error correction method, determined based on the position information and transmitted in the control information communication;
Setting a band used for the control information communication based on the information about the mobile station control communication band, and setting data communication based on the communication parameter;
A program that executes A computer comprising a fixed station and a mobile station, wherein control information communication and data communication between the fixed station and the mobile station and between the mobile stations are performed via a satellite and controls the fixed station of a satellite communication system In addition,
Until a mobile station control communication band that is a band used for the control information communication of the mobile station is allocated, it is included in an allocation band that is a set of bands reserved in advance to be allocated to the mobile station control communication band. not the mobile station at a predetermined bandwidth to transmit, the mobile station, performance information, to receive location information of the mobile station parameter and the mobile station includes at least one of the fault and configuration information in the control information communication Steps,
Determining the mobile station control communication band from the allocation band based on the mobile station parameters and the location information;
Determining communication parameters including at least one of a frequency, a modulation scheme, a transmission rate, and an error correction scheme used by the mobile station for data communication based on the mobile station parameters and the position information;
Transmitting information on the mobile station control communication band to the mobile station using the predetermined band in the control information communication, and transmitting the communication parameters to the mobile station in the control information communication;
A program that executes

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