JP2007251935A - Mobile communication system, base station, mobile station, and mobile communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid the occurrence of interference between a WiMAX communication system and an existent satellite mobile communication system even when the WiMAX communication system utilizing a frequency band adjacent to a frequency band used in the existent satellite mobile communication system is introduced into an environment where the existent satellite mobile communication system has been introduced. <P>SOLUTION: A mobile communication system is equipped with: a frequency utilization prohibition range setting section 31 for setting a frequency utilization prohibition range indicating a frequency band to prohibit utilization for first communication in a first communication system at the side of a boundary with a second frequency band within a first frequency band based on a frequency channel utilization situation in a second communication system for performing second communication using a frequency channel within the second frequency band adjacent to the first frequency band; and a communication section 32 for determining a frequency channel to be utilized for communication in the first communication system while taking the frequency utilization prohibition range into account. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides a first communication system that performs first communication using a frequency channel in a first frequency band and a frequency channel in a second frequency band adjacent to the first frequency band. The present invention relates to a mobile communication system and a mobile communication method including a second communication system that performs communication 2 and a base station and a mobile station used in the mobile communication system or mobile communication method.

  Conventionally, as shown in FIG. 23, a satellite mobile communication system is known that is performed using a satellite communication space station 1, a satellite communication earth station 2, and a satellite communication mobile station 3.

  In such a satellite mobile communication system, as shown in FIG. 24, a part or all of the frequency band of 2500 MHz to 2535 MHz is used for downlink communication from the satellite communication space station 1 to the satellite communication mobile station 3. A part or all of the frequency band of 2655 MHz to 2690 MHz is used for uplink communication from the satellite communication mobile station 3 to the satellite communication space station 1.

  In recent years, “WiMAX (World Wide Interoperability for Microwave Access)” has been defined as a standard for fixed wireless communication.

Then, as shown in FIG. 23, in an environment where the above-described satellite communication is performed, it is considered to perform WiMAX communication by installing the WiMAX communication base station 20 and the WiMAX communication mobile station 10.
JP-A-11-341555

  However, in the above-described examination, it is assumed that a frequency band of 2535 MHz to 2605 MHz is used for WiMAX communication, and therefore, there are a frequency band used in WiMAX communication and a frequency band used in downlink communication in the satellite communication described above. As a result of being adjacent, there is a problem in that interference occurs between both communications (specifically, between downlink communications and WiMAX communications in satellite communications).

  Therefore, the present invention has been made in view of the above-described problems, and uses a frequency band adjacent to a frequency band used in an existing satellite mobile communication system in an environment where the existing satellite mobile communication system is introduced. Mobile communication system and mobile communication method capable of avoiding interference between the two communication systems, and a base station used in the mobile communication system and mobile communication method And to provide a mobile station.

  According to a first aspect of the present invention, there is provided a first communication system that performs first communication using a frequency channel in a first frequency band, and a second frequency band that is adjacent to the first frequency band. A second communication system that performs a second communication using a frequency channel, wherein the second communication system includes a second communication system that uses a frequency channel in the first frequency band. A frequency use prohibition range setting configured to set a frequency use prohibition range indicating a frequency band prohibited from being used for communication in the first communication system on a boundary side with the second frequency band. And a communication unit configured to determine a frequency channel to be used for communication in the first communication system in consideration of the frequency use prohibition range. And effect.

  According to this invention, based on the frequency channel usage situation in the second communication system (satellite mobile communication system), the first frequency band (frequency band used in WiMAX communication) and the second frequency band (in satellite communication). In the environment where the second communication system is introduced, the second frequency can be set as a guard band near the boundary with the frequency band used). Even when the first communication system (WiMAX communication system) that performs the first communication using the first frequency band adjacent to the band is introduced, the occurrence of interference between the two communications can be avoided. it can.

  In the first aspect of the present invention, a traffic management unit configured to manage a traffic situation in the second communication system, and a frequency channel used for the second communication according to the traffic situation, A frequency channel allocation unit configured to allocate, and a frequency channel usage status notification unit configured to notify the frequency channel usage prohibition range setting unit based on the allocation result. You may have.

  In addition, according to this invention, even when the mobile station in the first communication system cannot grasp the frequency channel use situation in the second communication system, the frequency channel use notice notified from the frequency channel use situation notifying unit. By using the situation, the above-described frequency use prohibition range can be provided.

  In the first aspect of the present invention, the frequency channel allocation unit is configured to sequentially allocate from the frequency channel on the side away from the first frequency band within the second frequency band, and When the frequency channel usage status notifying unit determines that the frequency channel usage status within the second frequency band is equal to or lower than a predetermined value as the frequency channel usage status, an alert signal indicating that fact is sent to the frequency usage prohibited range. It may be configured to notify the setting unit.

  In the first aspect of the present invention, the frequency channel allocation unit is configured to sequentially allocate from the frequency channel on the side away from the first frequency band within the second frequency band, and The frequency channel usage status notifying unit may be configured to notify the frequency usage prohibited range setting unit of a frequency band that can be used within the second frequency band as the frequency channel usage status.

  In the first aspect of the present invention, a use frequency channel configured such that a base station in the first communication system detects a frequency channel used in the second communication system via an antenna. The frequency use prohibition range setting unit may be provided in the base station and configured to set the frequency use prohibition range based on the detected frequency channel.

  In the first aspect of the present invention, a used frequency channel configured such that a mobile station in the first communication system detects a frequency channel used in the second communication system via an antenna. It may comprise a detection unit, and the frequency use prohibition range setting unit may be provided in the mobile station and configured to set the frequency use prohibition range based on the detected frequency channel.

  In the first aspect of the present invention, the frequency use prohibition range setting unit may be configured to set the frequency use prohibition range in units of one or a plurality of frequency channels.

  In the first feature of the present invention, a position information acquisition unit configured to acquire position information of a communication terminal that performs second communication in the second communication system, and in the second communication system, the position information acquisition unit Based on interference area information indicating an interference area where interference from the first communication occurs and position information of the communication terminal, the frequency channel for the second communication out of the frequency channels in the second frequency band And a frequency channel allocating unit configured to allocate.

  In the first aspect of the present invention, the frequency channel allocating unit uses the location information of the communication terminal to determine the distance between the control device in the first communication system and the communication terminal in the second communication system. And the second communication frequency channel may be allocated from the frequency channels in the second frequency band based on the calculated distance.

  According to this invention, in an environment where the first communication system and the second communication system are mixed, the interference between the two communication systems can be measured without measuring the interference state in the second communication system. Occurrence can be avoided.

  In the first aspect of the present invention, the frequency channel allocation unit sequentially allocates the second communication frequency channel from a frequency channel closer to the first frequency band within the second frequency band. It may be configured as follows.

  According to this invention, based on the position information and interference area information of the communication terminal (satellite communication mobile station) that performs the second communication, the communication terminal generates interference from the first communication (WiMAX communication). The second communication frequency channel (satellite communication frequency channel) is allocated from the frequency channel closer to the first frequency band when the frequency band is not in the interference area. In an environment in which the first communication system and the second communication system are mixed, it is possible to avoid the occurrence of interference between the two communication systems and to achieve efficient frequency utilization.

  In the first aspect of the present invention, the apparatus includes a moving speed acquisition unit configured to acquire a moving speed of the communication terminal, and the frequency channel allocating unit is based on the moving speed of the communication terminal. You may be comprised so that the frequency channel for said 2nd communication may be allocated from the frequency channels in a 2nd frequency band.

  According to this invention, when the communication terminal that performs the second communication moves at a high speed, the communication terminal enters the interference area before the completion of the second communication, as compared with the case where the communication terminal is stationary. In consideration of the high possibility, the frequency channel for the second communication can be allocated.

  In the first aspect of the present invention, the frequency channel allocating unit may select the second frequency channel from the frequency channels in the second frequency band based on whether the communication terminal is a portable type or a fixed type. The communication frequency channel may be allocated.

  According to this invention, when the communication terminal that performs the second communication is portable, there is a possibility that the communication terminal may enter the interference area before the second communication is completed, compared to the case where the communication terminal is fixed. Therefore, the frequency channel for the second communication can be allocated.

  In the first feature of the present invention, the frequency channel allocating unit, when the location information of the communication terminal is not acquired, based on an interference situation in the communication terminal, The second communication frequency channel may be allocated from the inside.

  According to this invention, in the environment where the first communication system and the second communication system described above are mixed, even if the position information of the communication terminal performing the second communication cannot be acquired, both communication Interference between systems can be avoided.

  In the first feature of the present invention, the frequency channel allocating unit has a frequency on the side farther from the first frequency band within the second frequency band when the location information of the communication terminal is not acquired. The second communication frequency channel may be sequentially allocated from the channel.

  According to this invention, in the environment where the first communication system and the second communication system described above are mixed, when the position information of the communication terminal performing the second communication cannot be acquired, the communication terminal Since it cannot be determined whether or not it exists in the interference area, the occurrence of interference between the two communication systems is avoided by assigning a frequency channel that is not easily affected by interference from the frequency channel in the first frequency band. can do.

  In the first feature of the present invention, a position information acquisition unit configured to acquire position information of a communication terminal that performs the second communication, and a communication terminal that performs the second communication, A frequency channel allocation unit configured to allocate a frequency channel used for the second communication, wherein the frequency use prohibition range setting unit allocates the frequency channel by interference from the first communication; The frequency use prohibition range may be set only in the first communication base station that manages the area where the communication terminal exists based on the location information of the communication terminal that cannot.

  In the first feature of the present invention, the frequency use prohibition range setting unit has the most dense communication terminals performing the second communication among the areas managed by the first communication base station. The frequency use prohibition range may be set only in the area.

  A second feature of the present invention is a base station that performs first communication with a mobile station using a frequency channel in a first frequency band in the first mobile communication system, Based on the frequency channel usage situation in the second communication system that performs the second communication using the frequency channel in the second frequency band adjacent to the second frequency band, the second frequency band in the first frequency band A frequency use prohibition range setting unit configured to set a frequency use prohibition range indicating a frequency band prohibited from being used for communication in the first communication system on a boundary side with the frequency band of The gist of the present invention is to include a communication unit configured to determine a frequency channel to be used for communication in the first communication system in consideration of a frequency use prohibited range.

  In the second aspect of the present invention, a use frequency channel detection unit configured to detect a frequency channel used in the second communication system via an antenna may be provided.

  A third feature of the present invention is a mobile station that performs first communication with a base station using a frequency channel in a first frequency band in the first mobile communication system, The second frequency band within the first frequency band based on the frequency channel usage situation in the second communication system that performs communication using the frequency channel within the second frequency band adjacent to the frequency band of the second frequency band. A frequency use prohibition range setting unit configured to set a frequency use prohibition range indicating a frequency band prohibited from being used for communication in the first communication system, and the frequency use prohibition range And a communication unit configured to determine a frequency channel to be used for communication in the first communication system.

  In the third aspect of the present invention, a use frequency channel detection unit configured to detect a frequency channel used in the second communication system via an antenna may be provided.

  According to a fourth aspect of the present invention, there is provided a first communication system that performs first communication using a frequency channel in the first frequency band, and a second frequency band that is adjacent to the first frequency band. A mobile communication method performed by a second communication system that performs a second communication using a frequency channel, wherein the mobile communication method is based on a frequency channel usage situation in the second communication system and is within the first frequency band. Taking into account the frequency use prohibition range, a step of setting a frequency use prohibition range indicating a frequency band prohibited from being used for communication in the first communication system on the boundary side with the second frequency band; And a step of determining a frequency channel to be used for communication in the first communication system.

  As described above, according to the present invention, a WiMAX communication system using a frequency band adjacent to a frequency band used in an existing satellite mobile communication system is introduced in an environment where the existing satellite mobile communication system is installed. Even in such a case, a mobile communication system and a mobile communication method capable of avoiding the occurrence of interference between both communication systems, and a base station and a mobile station used in the mobile communication system and the mobile communication method are provided. be able to.

(Mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 1 thru | or FIG. 3, the structure of the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the mobile communication system according to this embodiment includes a satellite mobile communication system (second communication) including a satellite communication space station 1, a satellite communication earth station 2, and a satellite communication mobile station 3. The WiMAX communication system (first communication system) including the WiMAX communication base station 30 and the WiMAX communication mobile station 10 is introduced into the environment in which the system) is introduced.

  Here, the satellite mobile communication system according to the present embodiment enables communication via a geostationary satellite, and applies an FDMA (Frequency Division Multiple Access) method and an SCPC (Single Channel Per Carrier) method. is doing.

  That is, in the satellite mobile communication system according to the present embodiment, when each user performs communication using the satellite communication mobile station 3, one frequency channel multiplexed by the FDMA method is assigned to such communication. It is configured.

  In such satellite communication, as shown in FIG. 16, a frequency band of 2500 MHz to 2535 MHz (second frequency band) is used for downlink communication from the satellite communication space station 1 to the satellite communication mobile station 3. In the upstream communication from the satellite communication mobile station 3 to the satellite communication space station 1, a frequency band of 2655 MHz to 2690 MHz is used.

  On the other hand, the WiMAX communication system according to the present embodiment enables fixed wireless communication in accordance with the standard “WiMAX” defined by WiMAX Forum, and adopts a multi-carrier scheme (OFDMA: Orthogonal Division Multiple Access) scheme. is doing.

  That is, in the WiMAX communication system according to the present embodiment, when each user performs communication using the mobile station 3 for satellite communication, one or a plurality of frequency channels multiplexed by the OFDMA scheme are assigned to such communication. It is configured to be.

  The “frequency channel” used in the present specification may be at least frequency-divided, and may be frequency-divided and further time-divided or code-divided.

  In such WiMAX communication, as shown in FIG. 16, the downlink communication from the WiMAX communication base station 30 to the WiMAX communication mobile station 10 and the uplink from the WiMAX communication mobile station 10 to the WiMAX communication base station 30 are performed. A frequency band (first frequency band) of 2535 MHz to 2655 MHz is used for both communications.

  In such WiMAX communication, the above-described frequency band of 2535 MHz to 2655 MHz is divided into 20 MHz band modes that are divided and used for each 20 MHz band, 10 MHz band mode that is divided and used for each 10 MHz band, and divided into 5 MHz bands. The 5 MHz band mode to be used is switched and used.

  The control device 20 according to the present embodiment is provided in the satellite communication earth station 2 and, as shown in FIG. 2, a traffic management unit 21, a frequency channel allocation unit 22, a frequency channel usage status notification unit 23, It has.

  The WiMAX communication base station 30 according to the present embodiment includes a frequency use prohibition range setting unit 31 and a communication unit 32.

  The traffic management unit 21 is configured to manage the traffic situation in the satellite mobile communication system (second communication system).

  Specifically, the traffic management unit 21 is configured to manage increase / decrease in traffic in downlink communication and uplink communication of a satellite mobile communication system (second communication system).

  The frequency channel allocating unit 22 is configured to allocate frequency channels (carriers) used for downlink communication and uplink communication of the satellite mobile communication system according to the traffic status managed by the traffic management unit 21. .

  Specifically, as shown in FIG. 3 (a) or FIG. 4 (a), the frequency channel allocating unit 22 is in the second frequency band (frequency band used in downlink communication of the satellite mobile communication system), The frequency channel is configured so as to be sequentially assigned from a frequency channel far from the first frequency band (frequency band used in the WiMAX communication system).

  That is, as shown in FIG. 3A or 4A, the frequency channel assignment unit 22 is configured to preferentially assign frequency channels that are not adjacent to the first frequency band.

  Further, as shown in FIG. 3 (a) or FIG. 4 (a), the frequency channel allocating unit 22 assigns a frequency band indicating a frequency band to which a frequency channel can be allocated in downlink communication of satellite communication in accordance with increase or decrease of traffic. Range a or frequency allocation range b is set.

  The frequency channel usage status notification unit 23 is configured to notify the frequency channel usage status setting unit 31 of the frequency channel usage status based on the frequency channel allocation result by the frequency channel allocation unit 22.

  For example, the frequency channel usage status notifying unit 23 uses an alert signal indicating that when the frequency band usable in the second frequency band is equal to or lower than a predetermined value as the frequency channel usage status described above as a frequency usage. It may be configured to notify the prohibited range setting unit 31.

  Further, the frequency channel usage status notifying unit 23 may be configured to notify the frequency usage prohibited range setting unit 31 of the frequency band that can be used in the second frequency band as the above-described frequency channel usage status. .

  As shown in FIG. 3B and FIG. 4B, the frequency use prohibition range setting unit 31 determines the first frequency band based on the frequency channel use situation in the satellite mobile communication system (second communication system). A frequency use prohibition range (guard band) indicating a frequency band prohibited from being used for communication in the first communication system is set on the boundary side with the second frequency band. .

  That is, the frequency use prohibition range setting unit 31 is configured to preferentially set the frequency use prohibition range for the frequency channel adjacent to the second frequency band.

  For example, the frequency use prohibition range setting unit 31 may be configured to set the above-described frequency use prohibition range in units of one frequency channel as shown in FIG.

  Moreover, the frequency use prohibition range setting unit 31 may be configured to set the above-described frequency use prohibition range in units of a plurality of frequency channels as illustrated in FIG. 4B.

  In the example of FIG. 4B, the frequency use prohibition range setting unit 31 determines the length of the frequency use prohibition range (frequency channels belonging to the frequency use prohibition range according to the frequency channel use situation in the second frequency band. May be configured to be changed.

  The communication unit 32 is configured to determine a frequency channel to be used for communication in the first communication system in consideration of the above-described frequency use prohibition range.

  Further, the communication unit 32 is configured to perform communication with the WiMAX communication mobile station 10 using the frequency channel determined by the communication unit 32.

(Operation of the mobile communication system according to the first embodiment of the present invention)
Hereinafter, the operation of the mobile communication system according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 5, in step S <b> 101, the control device 20 provided in the satellite communication earth station 2 sets a frequency allocation range in accordance with traffic increase / decrease in satellite communication downlink communication.

  In step S102, the control device 20 notifies the WiMAX communication base station 30 of the frequency channel utilization status (for example, the frequency allocation range, the usable frequency band, the above-described alert signal, etc.) in satellite communication downlink communication.

  In step S103, the WiMAX communication base station 30 sets a frequency use prohibition range according to the received frequency channel use status, and in step S104, notifies the WiMAX communication mobile station 10 of the set frequency use prohibition range. .

  In step S105, the WiMAX communication mobile station 10 sets the notified frequency use prohibited range.

  In step S106, the WiMAX communication mobile station 10 and the WiMAX communication base station 30 are considered in consideration of the set frequency use prohibition range, that is, by assigning frequencies other than the frequency channels belonging to the set frequency use prohibition range. Start communication with.

(Operations and effects of the mobile communication system according to the first embodiment of the present invention)
According to the mobile communication system according to the present embodiment, the first frequency band (frequency band used in WiMAX communication) and the second frequency band are used based on the frequency channel usage situation in the satellite mobile communication system (second communication system). In the environment where such a satellite mobile communication system is introduced, a frequency use prohibited range whose length can be adjusted can be provided as a guard band in the vicinity of the boundary with the frequency band (frequency band used in satellite communication). Even when a WiMAX communication system (first communication system) that performs communication using the first frequency band adjacent to the second frequency band is introduced, between both communication (specifically, satellites) It is possible to avoid the occurrence of interference between communication downlink communication and WiMAX communication).

  Further, according to the mobile communication system according to the present embodiment, even if the WiMAX communication mobile station 10 cannot grasp the frequency channel usage status in the satellite mobile communication system (second communication system), The frequency use prohibition range described above can be provided by using the notified frequency channel use situation.

(Mobile communication system according to the second embodiment of the present invention)
A mobile communication system according to the second embodiment of the present invention will be described with reference to FIGS. Hereinafter, the mobile communication system according to the present embodiment will be described by focusing on differences from the mobile communication system according to the first embodiment described above.

  The configuration of the mobile communication system according to this embodiment is the same as that of the above-described first embodiment except that the control device 20 according to this embodiment is provided separately from the satellite communication earth station 2. The configuration is the same as that of the mobile communication system.

  Therefore, as shown in FIG. 7, the satellite communication earth station 2 includes the traffic management unit 21 and the frequency channel allocation unit 22 described above, and the control device 20 includes the frequency channel utilization state notification unit 23. .

  Therefore, the frequency channel allocation unit 22 is configured to notify the frequency channel usage prohibition range setting unit 31 of the frequency channel usage status based on the frequency channel allocation result by the frequency channel allocation unit 22.

  Hereinafter, the operation of the mobile communication system according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 8, in step S201, the satellite communication earth station 2 sets a frequency allocation range (that is, allocates a frequency channel) in accordance with increase / decrease of traffic in downlink communication of satellite communication.

  In step S202, the satellite communication earth station 2 notifies the control device 20 of the frequency channel assignment result.

  In step S203, the control device 20 displays the frequency channel usage status (for example, the frequency allocation range, the usable frequency band, the above-described alert signal, etc.) in the downlink communication of the satellite communication calculated based on the frequency channel allocation result as WiMAX. The communication base station 30 is notified.

  Here, the system operator may be configured to manually notify the WiMAX communication base station 30 of the above-described frequency channel usage status using the control device 20.

  In step S204, the WiMAX communication base station 30 sets a frequency use prohibition range according to the received frequency channel use status, and in step S205, notifies the WiMAX communication mobile station 10 of the set frequency use prohibition range. .

  In step S206, the WiMAX communication mobile station 10 sets the notified frequency use prohibited range.

  In step S207, the WiMAX communication mobile station 10 and the WiMAX communication base station 30 are considered in consideration of the set frequency use prohibition range, that is, by assigning frequencies other than the frequency channels belonging to the set frequency use prohibition range. Start communication with.

(Mobile communication system according to the third embodiment of the present invention)
A mobile communication system according to the third embodiment of the present invention will be described with reference to FIG. 9 to FIG. Hereinafter, the mobile communication system according to the present embodiment will be described by focusing on differences from the mobile communication system according to the first or second embodiment described above.

  In the mobile communication system according to the present embodiment, as shown in FIGS. 9 and 10, the WiMAX communication base station 30 is a satellite communication antenna capable of receiving signals in a frequency band used in downlink communication of satellite communication. 30A.

  Specifically, as shown in FIG. 10, the WiMAX communication base station 30 according to the present embodiment includes a satellite communication use frequency channel detection unit 33 in addition to the frequency use prohibition range setting unit 31 and the communication unit 32 described above. It has.

  The satellite communication use frequency channel detection unit 33 is configured to detect a frequency channel (within the second frequency band) used in the satellite mobile communication system via the satellite communication antenna 30A.

  Therefore, the frequency use prohibition range setting unit 31 is configured to set the above-described frequency use prohibition range based on the frequency channel detected by the satellite communication use frequency channel detection unit 33.

  Here, the frequency use prohibition range setting unit 31 may be configured to set the frequency use prohibition range in consideration of all frequency channels among the frequency channels detected by the satellite communication use frequency channel detection unit 33. Alternatively, the frequency use prohibition range may be set based on the frequency channel closest to the first frequency band (in this embodiment, the frequency channel with the maximum frequency).

  Hereinafter, the operation of the mobile communication system according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 11, in step S301, the WiMAX communication base station 30 is set via the satellite communication antenna 30A in the frequency channel used in the satellite mobile communication system (that is, in satellite communication downlink communication). Frequency allocation range) is detected.

  In step S302, the WiMAX communication base station 30 determines the frequency channel usage status (for example, frequency allocation range, usable frequency band, the above-described alert signal, etc.) in downlink communication of satellite communication based on the detection result in step S301. get.

  In step S303, the WiMAX communication base station 30 sets a frequency use prohibition range according to the received frequency channel use status, and notifies the WiMAX communication mobile station 10 of the set frequency use prohibition range.

  In step S304, the WiMAX communication mobile station 10 sets the notified frequency use prohibition range.

  In step S305, the WiMAX communication mobile station 10 and the WiMAX communication base station 30 are considered in consideration of the set frequency use prohibited range, that is, by assigning frequencies other than the frequency channels belonging to the set frequency use prohibited range. Start communication with.

(Mobile communication system according to the fourth embodiment of the present invention)
A mobile communication system according to the fourth embodiment of the present invention will be described with reference to FIGS. Hereinafter, the mobile communication system according to the present embodiment will be described focusing on differences from the mobile communication systems according to the first to third embodiments described above.

  In the mobile communication system according to this embodiment, as shown in FIGS. 12 and 13, the WiMAX communication mobile station 10 is a satellite communication antenna capable of receiving signals in the frequency band used in the downlink communication of satellite communication. 10A.

  Specifically, the WiMAX communication mobile station 10 according to the present embodiment includes a satellite communication use frequency channel detection unit 11, a frequency use prohibition range setting unit 12, and a communication unit 13, as shown in FIG. is doing.

  The satellite communication use frequency channel detection unit 11 is configured to detect a frequency channel (within the second frequency band) used in the satellite mobile communication system via the satellite communication antenna 10A.

  The frequency use prohibition range setting unit 12 is configured to set the above-described frequency use prohibition range based on the frequency channel detected by the satellite communication use frequency channel detection unit 11.

  Here, the frequency use prohibition range setting unit 12 may be configured to set the frequency use prohibition range in consideration of all frequency channels among the frequency channels detected by the satellite communication use frequency channel detection unit 11. Alternatively, the frequency use prohibition range may be set based on the frequency channel closest to the first frequency band (in this embodiment, the frequency channel with the maximum frequency).

  The communication unit 13 is configured to determine a frequency channel to be used for communication in the first communication system in consideration of the above-described frequency use prohibition range.

  The communication unit 13 is configured to communicate with the WiMAX communication base station 30 using the frequency channel determined by the communication unit 32 via the WiMAX communication antenna 10B.

  Hereinafter, the operation of the mobile communication system according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 14, in step S401, the WiMAX communication mobile station 10 is set via the satellite communication antenna 10A in the frequency channel used in the satellite mobile communication system (that is, in satellite communication downlink communication). Frequency allocation range) is detected.

  In step S402, based on the detection result in step S401, the WiMAX communication mobile station 10 uses frequency channels in satellite communication downlink communication (for example, frequency allocation range, usable frequency band, the above alert signal, etc.). To get.

  In step S403, the WiMAX communication mobile station 10 sets a frequency use prohibition range according to the received frequency channel use status, and notifies the WiMAX communication base station 30 of the set frequency use prohibition range.

  In step S404, the WiMAX communication base station 30 sets the notified frequency use prohibited range.

  Here, the WiMAX communication base station 30 may be configured to set the notified frequency use prohibition range for all of the subordinate WiMAX communication mobile stations, or the WiMAX communication mobile station. It may be configured to set only 10.

  In step S405, the WiMAX communication mobile station 10 and the WiMAX communication base station 30 are considered in consideration of the set frequency use prohibited range, that is, by assigning frequencies other than the frequency channels belonging to the set frequency use prohibited range. Start communication with.

(Example of change)
In the above-described embodiment, the frequency use prohibition range setting unit 31 of the WiMAX communication base station 30 and the frequency use prohibition range setting unit 12 of the WiMAX communication mobile station 10 include the 20 MHz band mode, the 10 MHz band mode, and the 5 MHz band mode. May be configured to set the above-described frequency use prohibition range (guard band).

  For example, the frequency use prohibition range setting unit 31 of the WiMAX communication base station 30 and the frequency use prohibition range setting unit 12 of the WiMAX communication mobile station 10 are set in the frequency use prohibition range set during WiMAX communication in the 10 MHz band mode. May be configured to widen the frequency use prohibition range by switching to WiMAX communication in the 5 MHz band mode when the threshold exceeds a predetermined threshold or when the above-described alert signal is received.

  In the above-described embodiment, the mobile communication system according to the present invention is used to avoid interference occurring between downlink communication of satellite communication and WiMAX communication. However, the mobile communication system according to the present invention is The present invention is not limited to such a case, and can be applied to other situations.

  For example, the mobile communication system according to the present invention is used to avoid interference between any two communication systems that use adjacent frequency bands, such as between uplink communication of satellite communication and audio satellite broadcasting. Can do.

(Mobile communication system according to the fifth embodiment of the present invention)
A mobile communication system according to the fifth embodiment of the present invention will be described with reference to FIGS. Hereinafter, the mobile communication system according to the present embodiment will be described focusing on differences from the mobile communication systems according to the first to fourth embodiments described above.

  As shown in FIG. 15, the satellite communication earth station 10 includes a position information acquisition unit 23A, a movement speed acquisition unit 24, a satellite communication mobile station information management unit 25, and a WiMAX communication base station. An information management unit 26, a margin management unit 27, and a frequency channel allocation unit 22 are provided.

  The position information acquisition unit 23A is configured to acquire position information of the satellite communication mobile station 3 (communication terminal that performs second communication). Specifically, the position information acquisition unit 23A may be configured to acquire position information of the satellite communication mobile station 3 using a GPS function.

  The moving speed acquisition unit 24 is configured to acquire the moving speed of the satellite communication mobile station 3.

  Specifically, the moving speed acquisition unit 24 acquires the moving speed of the mobile station 3 for satellite communication, and sets the acquired moving speed of the mobile station 3 for satellite communication to “stationary”, “quasi-stationary”, “low-speed movement”. ”Or“ high-speed movement ”, and the classification result is recorded in the satellite communication mobile station information management unit 25 as the movement state of the satellite communication mobile station 3. .

  For example, the movement speed acquisition unit 24 may be configured to determine the movement speed of the satellite communication mobile station 3 based on the movement distance in a predetermined period in the past. The mobile communication station 3 may be configured to determine the moving speed of the satellite communication mobile station 3 based on the variation amount of the frequency channel established by the satellite communication mobile station 3 type (portable type or fixed type). ), The moving speed of the satellite communication mobile station 3 may be determined.

  As shown in FIG. 16, the satellite communication mobile station information management unit 25 associates “mobile station ID”, “position information”, “type”, “movement state”, and “interference state” with satellite communication. Mobile station information is managed.

  “Mobile station ID” indicates identification information of the mobile station for satellite communication, “Position information” indicates position information of the mobile station for satellite communication acquired by the position information acquisition unit 23A, and “Type” indicates The type (for example, portable type or fixed type) of the mobile station for satellite communication is shown.

  The “moving state” is a moving state (for example, “stationary”, “quasi-stationary”, “low-speed moving”, “ Fast movement ").

  The “interference state” indicates a frequency channel in which interference occurs in the satellite communication mobile station among the frequency channels in the second frequency band.

  As shown in FIG. 17, the WiMAX communication base station information management unit 26 “base station ID”, “position information”, “transmission power”, “tilt angle”, “beam direction”, “ It is configured to manage WiMAX communication base station information associating “frequency band used”, “maximum antenna gain”, and “use of multiple antennas”.

  “Base station ID” indicates identification information of the WiMAX communication base station, “Position information” indicates position information of the WiMAX communication base station, and “Transmission power” indicates the antenna of the WiMAX communication base station. The “tilt angle” indicates the tilt angle of the beam transmitted from the antenna of the WiMAX communication base station, and the “beam direction” indicates the beam transmitted from the antenna of the WiMAX communication base station. Indicates the direction.

  “Used frequency band” indicates a frequency band used by the WiMAX communication base station, “Maximum antenna gain” indicates a maximum value of the antenna gain in the WiMAX communication base station, and for the WiMAX communication It may be determined in consideration of antenna gain and antenna directivity in the base station.

  “Use of multi-antenna” indicates whether or not a multi-antenna (MIMO, AAS, etc.) is used in the WiMAX communication base station.

  As shown in FIG. 18, the margin management unit 27 is configured to manage the “movement state” and the “margin” in association with each other.

  The frequency channel assignment unit 22 is configured to assign a frequency channel for satellite communication (second communication) from frequency channels in the second frequency band.

  Specifically, the frequency channel allocating unit 22 includes interference area information indicating an interference area where interference from WiMAX communication (first communication) occurs in the satellite communication system (second communication system), and a satellite communication mobile station. Based on the 50 position information, a frequency channel for satellite communication (second communication) is allocated from frequency channels usable in the second frequency band.

  Here, the “usable frequency channel” refers to a frequency channel that is unused in a target area to which a frequency channel for satellite communication is allocated and that satisfies the criteria of received power and interference amount.

  Further, the frequency channel allocating unit 22 is configured to provide a distance X between a WiMAX communication base station 30 (a control device in the first communication system), which will be described later, and a satellite communication mobile station 3 (a communication terminal in the second communication system). The frequency channel for satellite communication may be allocated from the frequency channels in the second frequency band.

  Further, the frequency channel assignment unit 22 may be configured to assign a frequency channel for satellite communication from among frequency channels in the second frequency band based on the moving speed of the mobile station 3 for satellite communication. .

  Further, the frequency channel allocating unit 22 is used for satellite communication from the frequency channels in the second frequency band based on the type of the mobile station 3 for satellite communication (that is, whether it is a portable type or a fixed type). The frequency channel may be allocated.

  Here, the frequency channel allocating unit 22 performs “transmission power”, “tilt angle”, “beam direction”, “maximum antenna gain”, and “use of multiple antennas” recorded in the base station management unit 26 for WiMAX communication. The size of the interference area is estimated according to the above.

  Further, the frequency channel allocating unit 22 uses the position information of the satellite communication mobile station 3 and the WiMAX communication base station 30 (control device in the first communication system) and the satellite communication mobile station 3 (second communication). The distance X to the communication terminal in the system is calculated.

  Further, the frequency channel allocating unit 22 is configured to extract a margin corresponding to the moving speed (moving state) of each satellite communication mobile station 3 from the margin managing unit 27.

  Then, the frequency channel allocating unit 22 calculates, for all the WiMAX communication base stations 30, the calculated distance X between the WiMAX communication base station 30 and the satellite communication mobile station 3 is the extracted margin and the WiMAX communication It is determined whether or not the satellite communication mobile station 3 exists in the interference area by the specific WiMAX communication base station 30 as to whether or not the sum is larger than the sum of the interference area size centered on the position of the base station 30. It is determined whether or not.

  For all WiMAX communication base stations 30, the frequency channel allocation unit 22 calculates the distance X between the calculated WiMAX communication base station 30 and the satellite communication mobile station 3 as the extracted margin and the WiMAX communication base station. When it is determined that the size is larger than the sum of the sizes of the interference areas centered on the position 30, that is, it is determined that the satellite communication mobile station 3 does not exist in the interference area of any WiMAX communication base station 30. In this case, the frequency channels for satellite communication are sequentially allocated from the frequency channel closer to the first frequency band within the second frequency band.

  On the other hand, the frequency channel allocator 22 calculates, for a specific WiMAX communication base station 30, the calculated distance X between the WiMAX communication base station 30 and the satellite communication mobile station 3 is the extracted margin and the WiMAX communication When it is determined that the size is not larger than the sum of the size of the interference area centered on the position of the base station 30, that is, the satellite communication mobile station 3 is within the interference area by the specific WiMAX communication base station 30. When it is determined that it exists, it is configured to sequentially assign the frequency channels for satellite communication from the frequency channel on the side far from the first frequency band within the second frequency band.

  Further, when the position information of the satellite communication mobile station 3 is not acquired, the frequency channel allocating unit 22 selects a frequency channel in the second frequency band based on the interference state in the satellite communication mobile station 3. It may be configured to allocate a frequency channel for satellite communication.

  Further, when the position information of the mobile station 3 for satellite communication is not acquired, the frequency channel allocating unit 22 performs satellite communication from the frequency channel on the side far from the first frequency band within the second frequency band. You may be comprised so that a frequency channel may be allocated sequentially.

  The frequency channel allocating unit 22 is configured to notify the satellite communication mobile station 3 and the control device 23 of the allocated frequency channel for satellite communication via the control channel. It is assumed that such a control channel is a frequency channel in a frequency band that is not easily affected by interference from WiMAX communication.

  Note that the frequency channel allocating unit 22 takes into account the interference state in the satellite communication mobile station 3 even if the position information of the satellite communication mobile station 3 has been acquired. It may be configured to allocate a frequency channel for satellite communication from among the frequency channels.

  When the interference situation in the satellite communication mobile station 3 is not taken into account, the propagation situation greatly changes due to the influence of the topography, buildings, etc., so the margin when the interference situation in the satellite communication mobile station 3 is not taken into consideration is the satellite communication. Even when the interference situation in the mobile station 3 is taken into consideration, it is assumed that it is set larger than the margin.

  Hereinafter, the operation of the mobile communication system according to the present embodiment will be described with reference to FIGS.

  First, the first operation of the mobile communication system according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 19, in step S1001, the frequency channel allocation unit 22 of the satellite communication earth station 2 receives the frequency channel allocation request transmitted from the satellite communication mobile station 3.

  In step S1002, the frequency channel assignment unit 22 refers to the satellite communication mobile station information management unit 25 and determines whether or not the position information of the satellite communication mobile station 3 has been acquired.

  If acquired, the operation proceeds to steps S1003 to S1005. If not acquired, the operation proceeds to step S1007.

  In step S1003, the frequency channel allocating unit 22 calculates the distance X between all the WiMAX communication base stations 30 and the satellite communication mobile station 3 using the position information of the satellite communication mobile station 3. In step S1004, the WiMAX communication base station management unit 26 is referred to estimate the interference area by all the WiMAX communication base stations 30, and in step S1005, the moving speed (movement state) of the mobile station 3 for satellite communication is estimated. ) Is extracted from the margin management unit 27.

  In step S1006A, the frequency channel assignment unit 22 determines whether or not the condition of (distance X)> (interference area size) + (margin) is satisfied for all the WiMAX communication base stations 30.

  If the frequency channel allocating unit 22 determines that the above condition is satisfied for all the WiMAX communication base stations 30, the frequency channel allocating unit 22 selects the first frequency from the unused frequency channels in the second frequency band in step S1006B. A frequency channel having a frequency closest to the band is assigned to the mobile station 3 for satellite communication.

  On the other hand, when the frequency channel allocating unit 22 determines that the above-mentioned condition is not satisfied for all the WiMAX communication base stations 30, in step S1006C, the frequency channel allocating unit 22 selects from the unused frequency channels in the second frequency band. The frequency channel farthest from the first frequency band is assigned to the satellite communication mobile station 3.

  In step S1007, the frequency channel allocating unit 22 refers to the interference status of the satellite communication mobile station 3 in the satellite communication mobile station information management unit 25, and selects one of the frequency channels in which no interference from WiMAX communication has occurred. Are assigned to the mobile station 3 for satellite communication.

  In step S1008, the frequency channel allocation unit 22 notifies the satellite communication mobile station 3 and the control device 20 of the allocated frequency channel, and the frequency channel usage status notification unit 23 of the control device 20 is notified. Based on the allocation result, the frequency channel usage status is notified to the WiMAX communication base station 30.

  Secondly, a second operation of the mobile communication system according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 20, in step S2001, the frequency channel assignment unit 22 of the satellite communication earth station 2 receives the frequency channel assignment request transmitted from the satellite communication mobile station 3.

  In step S2002, the frequency channel assignment unit 22 refers to the interference state of the satellite communication mobile station 3 in the satellite communication mobile station information management unit 25 and extracts a frequency channel in which no interference from WiMAX communication occurs. To do.

  In step S2003, the frequency channel allocation unit 22 refers to the satellite communication mobile station information management unit 25 and determines whether or not the position information of the satellite communication mobile station 3 has been acquired.

  If acquired, the operation proceeds to steps S2004 to S2006. If not acquired, the operation proceeds to step S2008.

  In step S2004, the frequency channel allocation unit 22 calculates the distance X between all the WiMAX communication base stations 30 and the satellite communication mobile station 3 using the position information of the satellite communication mobile station 3. In step S2005, the WiMAX communication base station management unit 26 is referred to, and interference areas of all the WiMAX communication base stations 30 are estimated. In step S2006, the moving speed (movement state) of the satellite communication mobile station 3 is estimated. ) Is extracted from the margin management unit 27.

  In step S2007A, the frequency channel assignment unit 22 determines whether or not the condition of (distance X)> (interference area size) + (margin) is satisfied for all the WiMAX communication base stations 30.

  If the frequency channel allocating unit 22 determines that the above-described condition is satisfied for all the WiMAX communication base stations 30, in step S2007B, the frequency channel allocating unit 22 selects an unused frequency channel in the second frequency band extracted in step S2002. Therefore, the frequency channel closest to the first frequency band is allocated to the mobile station 3 for satellite communication.

  On the other hand, when the frequency channel allocating unit 22 determines that the above condition is not satisfied for all the WiMAX communication base stations 30, in step S2007C, the frequency channel allocating unit 22 is unused in the second frequency band extracted in step S2002. Of the frequency channels, the frequency channel farthest from the first frequency band is assigned to the mobile station 3 for satellite communication.

  In step S2008, the frequency channel allocator 22 selects a frequency channel farthest from the first frequency band from the unused frequency channels in the second frequency band extracted in step S2002 for the satellite communication. Assigned to the mobile station 3.

  In step S2009, the frequency channel assignment unit 22 notifies the satellite communication mobile station 3 and the control device 20 of the assigned frequency channel, and the frequency channel utilization state notification unit 23 of the control device 20 is notified. Based on the allocation result, the frequency channel usage status is notified to the WiMAX communication base station 30.

  Thirdly, a third operation of the mobile communication system according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 21, in step S3001, the frequency channel assignment unit 22 of the satellite communication earth station 2 receives the frequency channel assignment request transmitted from the satellite communication mobile station 3.

  In step S3002, the frequency channel assignment unit 22 refers to the satellite communication mobile station information management unit 25 and determines whether or not the position information of the satellite communication mobile station 3 has been acquired.

  If it has been acquired, the operation proceeds to steps S3003 to S3005. If it has not been acquired, the operation proceeds to step S3007.

  In step S3003, the frequency channel allocation unit 22 calculates the distance X between all the WiMAX communication base stations 30 and the satellite communication mobile station 3 using the position information of the satellite communication mobile station 3. In step S3004, with reference to the WiMAX communication base station management unit 26, the interference areas of all the WiMAX communication base stations 30 are estimated. In step S3005, the moving speed (movement state) of the mobile station 3 for satellite communication is estimated. ) Is extracted from the margin management unit 27.

  In step S3006A, the frequency channel assignment unit 22 determines whether or not the condition of (distance X)> (interference area size) + (margin) is satisfied for all the WiMAX communication base stations 30.

  If the frequency channel allocating unit 22 determines that the above-mentioned condition is satisfied for all the WiMAX communication base stations 30, in step S3006B, the frequency channel allocating unit 22 determines a predetermined interference amount from the unused frequency channels in the second frequency band. A frequency channel that is equal to or less than the threshold and closest to the first frequency band is assigned to the satellite communication mobile station 3.

  On the other hand, when the frequency channel allocating unit 22 determines that the above condition is not satisfied for all the WiMAX communication base stations 30, in step S3006C, the frequency channel allocating unit 22 selects the unused frequency channels in the second frequency band from A frequency channel whose interference amount is equal to or less than a predetermined threshold and which is farthest from the first frequency band is assigned to the mobile station 3 for satellite communication.

  In step S3007, the frequency channel allocating unit 22 refers to the interference state of the satellite communication mobile station 3 in the satellite communication mobile station information management unit 25, and is one of the channels in which no interference from WiMAX communication occurs. Are assigned to the mobile station 3 for satellite communication.

  In step S3008, the frequency channel allocation unit 22 notifies the satellite communication mobile station 3 and the control device 20 of the allocated frequency channel, and the frequency channel usage status notification unit 23 of the control device 20 is notified. Based on the allocation result, the frequency channel usage status is notified to the WiMAX communication base station 30.

  According to the mobile communication system according to the present embodiment, in an environment where a WiMAX communication system and a satellite communication system are mixed, the occurrence of interference between both communication systems can be achieved without measuring the interference state in the satellite communication system. It can be avoided.

  According to the mobile communication system according to the present embodiment, based on the position information and interference area information of the satellite communication mobile station 3, the satellite communication mobile station 3 is present in an interference area where interference from WiMAX communication occurs. If not, since it is configured to allocate the frequency channel for satellite communication from the frequency channel closer to the first frequency band, both communication in an environment where the WiMAX communication system and the satellite communication system are mixed Interference between systems can be avoided and efficient frequency utilization can be realized.

  According to the mobile communication system according to the present embodiment, when the satellite communication mobile station 3 is moving at a high speed, it enters the interference area before the satellite communication is completed, compared to when the satellite communication mobile station 3 is stationary. In view of the high possibility that the frequency channel for satellite communication will be allocated.

  According to the mobile communication system according to the present embodiment, when the satellite communication mobile station 3 is portable, it enters the interference area before the satellite communication is completed, compared to the case where it is fixed. In consideration of the high possibility, the frequency channel for satellite communication can be allocated.

  According to the mobile communication system according to the present embodiment, even in the environment where the WiMAX communication system and the satellite communication system are mixed, even when the position information of the mobile station 3 for satellite communication cannot be acquired, Interference can be avoided in

  According to the mobile communication system according to the present embodiment, in the environment where the WiMAX communication system and the satellite communication system are mixed, when the position information of the satellite communication mobile station 3 cannot be acquired, the satellite communication mobile station Since it is impossible to determine whether or not 3 is present in the interference area, the occurrence of interference between the two communication systems by assigning a frequency channel that is not easily affected by interference from the frequency channel in the first frequency band. Can be avoided.

(Mobile communication system according to the sixth embodiment of the present invention)
A mobile communication system according to a sixth embodiment of the present invention will be described with reference to FIG. Hereinafter, the mobile communication system according to the present embodiment will be described focusing on differences from the mobile communication system according to the fifth embodiment described above.

  As shown in FIG. 22, when the frequency channel acquisition unit 22 receives the frequency channel assignment request from the mobile station 3 for satellite communication in step S4001, the mobile station 3 for satellite communication in the mobile station information management unit 25 for satellite communication. Search for interference status.

  In step S4002, the frequency channel acquisition unit 22 determines whether there is a frequency channel that can be allocated to the mobile station 3 for satellite communication.

  If it is determined that it exists, the operation proceeds to step S4005. If it is determined that it does not exist, the operation proceeds to step S4003.

  In step S4003, the frequency channel acquisition unit 22 determines whether there is a frequency channel that can be allocated to the satellite communication mobile station 3 by exchanging the allocated frequency channel.

  That is, the frequency channel assignment unit 22 assigns a frequency channel assigned to another satellite communication mobile station to the satellite communication mobile station 3, and separately assigns the frequency channel assigned to the other satellite communication mobile station. It is determined whether or not it is possible to assign a frequency channel.

  If it is determined that it exists (is possible), the operation proceeds to step S4004. If it is determined that it does not exist (is impossible), the operation ends without assigning a frequency channel.

  In step S4004, the frequency channel allocating unit 22 performs frequency channel exchange processing. That is, the frequency channel allocated to another satellite communication mobile station described above is assigned to the satellite communication mobile station 3. Assign another frequency channel to the other mobile station for satellite communication.

  In step S4005, the frequency channel allocating unit 22 notifies the frequency channel utilization state notifying unit 23 of the allocation result.

  In step S4006, the frequency channel usage status notifying unit 23 determines whether the number of frequency channels that can be used in the satellite communication system is equal to or less than a predetermined threshold.

  When it is determined that the frequency is equal to or less than the predetermined threshold, in step S4007, the frequency channel usage state notifying unit 23 notifies the WiMAX communication base station 30 of an alert signal indicating that fact.

(Mobile communication system according to the seventh embodiment of the present invention)
Hereinafter, the mobile communication system according to the seventh embodiment of the present invention will be described by focusing on differences from the above-described mobile communication system according to the fifth embodiment.

  In the mobile communication system according to the present embodiment, the frequency use prohibition range setting unit 31 is based on the position information of the satellite communication mobile station 3 (communication terminal) that cannot allocate the satellite communication frequency channel due to interference from WiMAX communication. Thus, only the WiMAX communication base station 30 (first communication base station) that manages the area in which the satellite communication mobile station 3 exists is configured to set the above-described frequency use prohibited range.

  In such a case, the frequency use prohibition range setting unit 31 prohibits the above-described frequency use only in an area managed by the WiMAX communication base station 30 where the mobile stations 3 for satellite communication are the most dense. It may be configured to set a range.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. It is a functional block diagram of the control apparatus which concerns on the 1st Embodiment of this invention, and the base station for WiMAX communication. It is a figure which shows an example of the setting method of the frequency use prohibition range in the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the setting method of the frequency use prohibition range in the mobile communication system which concerns on the 1st Embodiment of this invention. FIG. 3 is a sequence diagram showing an operation of the mobile communication system according to the first embodiment of the present invention. It is a whole block diagram of the mobile communication system which concerns on the 2nd Embodiment of this invention. FIG. 6 is a functional block diagram of a satellite communication mobile station, a control apparatus, and a WiMAX communication base station according to a second embodiment of the present invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the 2nd Embodiment of this invention. It is a whole block diagram of the mobile communication system which concerns on the 3rd Embodiment of this invention. It is a functional block diagram of the base station for WiMAX communication which concerns on the 3rd Embodiment of this invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the 3rd Embodiment of this invention. It is a whole block diagram of the mobile communication system which concerns on the 4th Embodiment of this invention. It is a functional block diagram of the mobile station for WiMAX communication which concerns on the 4th Embodiment of this invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the 4th Embodiment of this invention. It is a functional block diagram of a satellite communication earth station, a control device, and a WiMAX communication base station according to a fifth embodiment of the present invention. It is a figure which shows an example of the mobile station information for satellite communications managed in the earth station for satellite communications concerning the 5th Embodiment of this invention. It is a figure which shows an example of the base station information for WiMAX communication managed in the earth station for satellite communications which concerns on the 5th Embodiment of this invention. It is a figure which shows an example of the margin information managed in the earth station for satellite communications concerning the 5th Embodiment of this invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the 5th Embodiment of this invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the 5th Embodiment of this invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the 5th Embodiment of this invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the 6th Embodiment of this invention. It is a whole block diagram of the mobile communication system which concerns on a prior art. It is a figure which shows the frequency utilization condition in the mobile communication system which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Satellite communication space station 2 ... Satellite communication earth station 3 ... Satellite communication mobile station 10 ... WiMAX communication mobile station 10A, 30A ... Satellite communication antenna 10B, 30B ... WiMAX communication antenna 11, 33 ... Satellite communication Use frequency channel detection unit 12, 31 ... Frequency use prohibition range setting unit 13, 32 ... Communication unit 20 ... Control device 21 ... Traffic management unit 22 ... Frequency channel allocation unit 23 ... Frequency channel use state notification unit 23A ... Location information acquisition unit 24 ... Movement speed acquisition unit 25 ... Mobile station information management unit for satellite communication 26 ... Base station information management unit for WiMAX communication 30 ... Base station for WiMAX communication

Claims (21)

A first communication system that performs a first communication using a frequency channel in a first frequency band; and a second communication that uses a frequency channel in a second frequency band adjacent to the first frequency band. A mobile communication system comprising: a second communication system for performing
Based on the frequency channel usage situation in the second communication system, use in communication in the first communication system is prohibited within the first frequency band and on the boundary side with the second frequency band. A frequency use prohibition range setting unit configured to set a frequency use prohibition range indicating a frequency band to be
A mobile communication system comprising: a communication unit configured to determine a frequency channel to be used for communication in the first communication system in consideration of the frequency use prohibition range. A traffic management unit configured to manage a traffic situation in the second communication system;
A frequency channel allocation unit configured to allocate a frequency channel used for the second communication according to the traffic situation;
The frequency channel usage status notifying unit configured to notify the frequency usage prohibition range setting unit of the frequency channel usage status based on the allocation result, according to claim 1. Mobile communication system. The frequency channel allocating unit is configured to sequentially allocate from the frequency channel on the side away from the first frequency band within the second frequency band,
The frequency channel usage status notifying unit prohibits the frequency usage when an alert signal indicating that the frequency channel usage status within the second frequency band is equal to or lower than a predetermined value as the frequency channel usage status. The mobile communication system according to claim 2, wherein the mobile communication system is configured to notify a range setting unit. The frequency channel allocating unit is configured to sequentially allocate from the frequency channel on the side away from the first frequency band within the second frequency band,
The frequency channel usage status notifying unit is configured to notify the frequency usage prohibition range setting unit of a frequency band that can be used in the second frequency band as the frequency channel usage status. The mobile communication system according to claim 2. The base station in the first communication system includes a use frequency channel detection unit configured to detect a frequency channel used in the second communication system via an antenna,
The mobile communication system according to claim 1, wherein the frequency use prohibition range setting unit is provided in the base station and configured to set the frequency use prohibition range based on the detected frequency channel. . The mobile station in the first communication system includes a use frequency channel detection unit configured to detect a frequency channel used in the second communication system via an antenna,
The mobile communication system according to claim 1, wherein the frequency use prohibition range setting unit is provided in the mobile station and configured to set the frequency use prohibition range based on the detected frequency channel. .   The frequency use prohibition range setting unit is configured to set the frequency use prohibition range in units of one or a plurality of frequency channels. Mobile communication system. In the first mobile communication system, a base station that performs first communication with a mobile station using a frequency channel in a first frequency band,
Based on the frequency channel usage situation in the second communication system that performs the second communication using the frequency channel in the second frequency band adjacent to the first frequency band, in the first frequency band, A frequency use prohibition range setting unit configured to set a frequency use prohibition range indicating a frequency band prohibited from being used for communication in the first communication system on a boundary side with the second frequency band. When,
A base station comprising: a communication unit configured to determine a frequency channel used for communication in the first communication system in consideration of the frequency use prohibition range.   The base station according to claim 8, further comprising: a used frequency channel detection unit configured to detect a frequency channel used in the second communication system via an antenna. In the first mobile communication system, a mobile station that performs first communication with a base station using a frequency channel in a first frequency band,
Based on the frequency channel usage situation in the second communication system that performs the second communication using the frequency channel in the second frequency band adjacent to the first frequency band, in the first frequency band, A frequency use prohibition range setting unit configured to set a frequency use prohibition range indicating a frequency band prohibited from being used for communication in the first communication system, between the second frequency band and the second frequency band; ,
A mobile station comprising: a communication unit configured to determine a frequency channel to be used for communication in the first communication system in consideration of the frequency use prohibition range.   The mobile station according to claim 10, further comprising: a used frequency channel detection unit configured to detect a frequency channel used in the second communication system via an antenna. A first communication system that performs a first communication using a frequency channel in a first frequency band; and a second communication that uses a frequency channel in a second frequency band adjacent to the first frequency band. A mobile communication method performed by a second communication system that performs
Based on the frequency channel usage situation in the second communication system, use in communication in the first communication system is prohibited within the first frequency band and on the boundary side with the second frequency band. A step of setting a frequency use prohibition range indicating a frequency band to be performed;
And determining a frequency channel to be used for communication in the first communication system in consideration of the frequency use prohibition range. A position information acquisition unit configured to acquire position information of a communication terminal that performs the second communication;
Based on interference area information indicating an interference area in which interference from the first communication occurs and position information of the communication terminal, the frequency for the second communication from the frequency channels in the second frequency band The mobile communication system according to claim 1, further comprising a frequency channel assignment unit configured to assign a channel.   The frequency channel allocating unit calculates a distance between the control device in the first communication system and the communication terminal in the second communication system using the position information of the communication terminal, and sets the calculated distance to the calculated distance. The mobile communication system according to claim 13, wherein the mobile communication system is configured to allocate the frequency channel for the second communication from frequency channels in the second frequency band based on the frequency channel. Comprising a moving speed acquisition unit configured to acquire the moving speed of the communication terminal;
The frequency channel allocating unit is configured to allocate the second communication frequency channel from frequency channels in the second frequency band based on a moving speed of the communication terminal. The mobile communication system according to claim 13 or 14.   The frequency channel allocation unit allocates the frequency channel for the second communication from the frequency channels in the second frequency band based on whether the communication terminal is a portable type or a fixed type. The mobile communication system according to claim 13 or 14, wherein the mobile communication system is configured as follows.   When the location information of the communication terminal is not acquired, the frequency channel allocation unit is configured to use the second communication channel from among frequency channels in the second frequency band based on an interference situation in the communication terminal. The mobile communication system according to any one of claims 13 to 16, wherein the mobile communication system is configured to allocate a frequency channel.   When the location information of the communication terminal is not acquired, the frequency channel allocating unit uses the frequency channel for the second communication from a frequency channel on the side away from the first frequency band within the second frequency band. The mobile communication system according to any one of claims 13 to 16, wherein the mobile communication system is configured to sequentially allocate frequency channels.   The frequency channel allocating unit is configured to sequentially allocate the second communication frequency channel from the frequency channel closer to the first frequency band within the second frequency band. The mobile communication system according to any one of claims 13 to 16. A position information acquisition unit configured to acquire position information of a communication terminal that performs the second communication;
A frequency channel allocating unit configured to allocate a frequency channel used for the second communication to a communication terminal performing the second communication;
The frequency use prohibition range setting unit is configured to manage an area where the communication terminal exists based on position information of a communication terminal to which the frequency channel cannot be allocated due to interference from the first communication. The mobile communication system according to claim 1, wherein the frequency use prohibition range is set only in a base station.   The frequency use prohibition range setting unit sets the frequency use prohibition range only in an area where communication terminals performing the second communication are most crowded among areas managed by the first communication base station. The mobile communication system according to claim 20, wherein the mobile communication system is configured to set.

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