JP6251705B2 - Communication terminal device and router device - Google Patents

Description

  The present invention relates to a communication terminal device that can be used in a mobile communication system, and a router device including the communication terminal device.

  Conventionally, a terrestrial cellular mobile communication system (hereinafter abbreviated as “terrestrial system”) via a cellular base station placed on the ground, and a satellite mobile communication system (hereinafter referred to as “satellite system” as appropriate) via artificial satellites. Communication terminal devices that can be used in the same area are known (see, for example, Non-Patent Document 1 and Patent Document 1).

  The radio transmission environment differs greatly between the above ground system and satellite system. Therefore, when one communication terminal device is shared for both the ground system and the satellite system, it is necessary to cope with the wireless transmission environment of each system. At the same time, a communication terminal device having a simple configuration excellent in portability is desired.

A communication terminal apparatus according to an aspect of the present invention is a communication terminal apparatus used in a mobile communication system, and includes a first antenna used for radio communication with a terrestrial cellular base station in a terrestrial cellular mobile communication system, and satellite mobile communication. A second antenna used for wireless communication with an artificial satellite in the system, and a system parameter group including values set in advance for each of a plurality of types of system parameters defined in common in the terrestrial cellular mobile communication system and the satellite mobile communication system A shared baseband processing means for processing a received signal and a transmission signal based on the first system parameter group optimized for a terrestrial cellular mobile communication system as the system parameter group used for the baseband processing means, Second system optimized for satellite mobile communication system Storage means for storing parameters, power amplification means for amplifying the power of each of the received signal input to the baseband processing means and the transmission signal output from the baseband processing means, and the terrestrial cellular mobile communication system And control means for controlling to use the first system parameter group or the second system parameter group for the baseband processing means in accordance with the selection of either of the satellite mobile communication systems.
According to this communication terminal apparatus, a dedicated antenna is used according to a mobile communication system selected from a terrestrial cellular mobile communication system and a satellite mobile communication system, and an optimized system parameter group is shared by a baseband processing means. Therefore, wireless communication corresponding to the wireless transmission environment of the selected mobile communication system becomes possible. Further, by switching the system parameter group, the same wireless transmission method can be used in the baseband processing means for each of the terrestrial cellular mobile communication system and the satellite mobile communication system, and the terrestrial cellular mobile communication system and the satellite mobile communication system can be easily used. You can switch to
Moreover, since the baseband processing means for processing the received signal and the transmitted signal based on the system parameter group can be shared by the terrestrial cellular mobile communication system and the satellite mobile communication system, each of the terrestrial cellular mobile communication system and the satellite mobile communication system The configuration can be simplified compared to a configuration including dedicated baseband processing means.

In the communication terminal apparatus, an antenna that switches between the first antenna and the second antenna connected to the power amplifying means in accordance with selection of either the terrestrial cellular mobile communication system or the satellite mobile communication system The power amplifying means further includes a common received power amplifier used for power amplification of received signals of each of the terrestrial cellular mobile communication system and the satellite mobile communication system, and power of a transmission signal of the terrestrial cellular mobile communication system. You may provide the 1st transmission power amplifier used for amplification, and the 2nd transmission power amplifier used for the power amplification of the transmission signal of a satellite mobile communication system. According to this communication terminal apparatus, since a dedicated transmission power amplifier can be used according to the mobile communication system selected from the terrestrial cellular mobile communication system and the satellite mobile communication system, it is possible to select without adjusting the gain of the amplifier. The transmission signal corresponding to the wireless transmission environment of the mobile communication system thus made can be amplified. Further, the reception power amplifier can be shared by the terrestrial cellular mobile communication system and the satellite mobile communication system by switching the antenna at the time of reception according to the mobile communication system selected from the terrestrial cellular mobile communication system and the satellite mobile communication system. A simple configuration can be achieved.
Further, in the communication terminal device, the first antenna and the second antenna connected to the power amplifying unit according to a selection of either the terrestrial cellular mobile communication system or the satellite mobile communication system. The antenna amplifying means for switching is further provided, and the power amplifying means includes a common received power amplifier used for power amplification of received signals of the terrestrial cellular mobile communication system and the satellite mobile communication system, a terrestrial cellular mobile communication system, and satellite movement. And a shared transmission power amplifier used for power amplification of transmission signals of each communication system. According to this communication terminal apparatus, a reception power amplifier is connected to the cellular mobile communication system and the satellite mobile communication system by switching the antenna at the time of transmission / reception according to the mobile communication system selected from the terrestrial cellular mobile communication system and the satellite mobile communication system. Since the transmission power amplifier can be shared, a simpler configuration can be achieved.
The communication terminal apparatus includes a plurality of the first antennas, and the control unit is configured to perform base station communication with a terrestrial cellular base station in the terrestrial cellular mobile communication system when the terrestrial cellular mobile communication system is selected. Each of the station and the communication terminal apparatus may be controlled to perform wireless communication using MIMO (Multi-Input-Multi-Output) technology that includes a plurality of antennas and simultaneously transmits and receives a plurality of data using the same frequency. According to this communication terminal apparatus, when a terrestrial cellular mobile communication system is selected, wireless communication by the MIMO technology becomes possible.
The communication terminal apparatus includes a plurality of the first antenna and the second antenna, and the control means is configured to control a terrestrial cellular base in the terrestrial cellular mobile communication system when the terrestrial cellular mobile communication system is selected. Radio communication using MIMO technology may be performed with a station, and when the satellite mobile communication system is selected, control may be performed so that radio communication using MIMO technology is performed with an artificial satellite in the satellite mobile communication system. According to this communication terminal apparatus, not only when a terrestrial cellular mobile communication system is selected, but also when a satellite mobile communication system is selected, wireless communication using MIMO technology becomes possible.
Further, in the communication terminal apparatus, when the terrestrial cellular mobile communication system is selected, the control means performs radio communication by MIMO technology only when receiving from a terrestrial cellular base station in the terrestrial cellular mobile communication system, and the satellite When the mobile communication system is selected, control may be performed so that radio communication by the MIMO technique is performed only when receiving from an artificial satellite in the satellite mobile communication system. According to this communication terminal apparatus, it is possible to perform wireless communication using the MIMO technology only at the time of reception in each of the terrestrial cellular mobile communication system and the satellite mobile communication system.
In the communication terminal device, the first antenna is two antennas that transmit and receive two types of linearly polarized radio waves whose polarization planes are orthogonal to each other, and the second antenna is a rotation of the polarization plane. It may be one antenna that transmits and receives two types of circularly polarized radio waves whose directions are opposite to each other. According to this communication terminal apparatus, it is possible to transmit and receive right-handed circularly polarized waves and left-handed circularly polarized waves used for wireless communication by MIMO technology in a satellite mobile communication system with one antenna.
In the communication terminal apparatus, the first antenna is one antenna that transmits and receives two types of linearly polarized radio waves whose polarization planes are orthogonal to each other, and the second antenna is a rotation direction of the polarization plane. May be one antenna that transmits and receives two types of circularly polarized radio waves in opposite directions. According to this communication terminal device, radio waves of two types of linearly polarized waves (for example, vertically polarized waves and horizontally polarized waves, or ± 45 ° orthogonally polarized waves) used for wireless communication by MIMO technology in a terrestrial cellular mobile communication system. Can be transmitted and received with one antenna, and radio waves of right-handed circularly polarized wave and left-handed circularly polarized wave used for wireless communication by MIMO technology in the satellite mobile communication system can be transmitted and received with one antenna.
The communication terminal apparatus may further include selection means for selecting one of the terrestrial cellular mobile communication system and the satellite mobile communication system based on a base station identifier in the common control signal included in the received signal. According to this communication terminal apparatus, radio communication is more reliably performed among the terrestrial cellular mobile communication system and the satellite mobile communication system based on the base station identifier in the common control signal included in the reception signal received by the communication terminal apparatus. It is possible to automatically select a mobile communication system that can be performed.
In the communication terminal device, the received power of the terrestrial cellular mobile communication system is compared with the first threshold value in a state where the terrestrial cellular mobile communication system is selected. If it is greater than the threshold, the terrestrial cellular mobile communication system is continuously selected, and if the received power of the terrestrial cellular mobile communication system is less than the first threshold or less than the first threshold, When switching to the satellite mobile communication system and selecting, comparing the received power of the satellite mobile communication system with the second threshold, and when the received power of the satellite mobile communication system is greater than or equal to the second threshold or greater than the second threshold The satellite mobile communication system may be selected continuously. According to this communication terminal apparatus, a terrestrial cellular mobile communication system with a more stable wireless transmission environment during normal use can be preferentially used, and a satellite can be used when a received signal from the terrestrial cellular mobile communication system becomes weak for some reason. Automatic switching to a mobile communication system becomes possible.
The communication terminal apparatus may further include an operation unit, and may further include a selection unit that selects one of the terrestrial cellular mobile communication system and the satellite mobile communication system based on a user operation of the operation unit. According to this communication terminal apparatus, the user can select a desired mobile communication system from the terrestrial cellular mobile communication system and the satellite mobile communication system by performing a selection operation.
In the communication terminal apparatus, the plurality of types of system parameters may include a modulation scheme, an error correction code coding rate, a maximum number of retransmissions, and a transmission / reception buffer amount for storing transmission / reception data. According to this communication terminal apparatus, it is possible to optimally set the modulation scheme, the error correction code coding rate, the maximum number of retransmissions, and the transmission / reception buffer amount for each of the terrestrial cellular mobile communication system and the satellite mobile communication system.

  A router device according to another aspect of the present invention includes any one of the communication terminal devices, a wired LAN (Local Area Network) communication unit or a wireless LAN (WLAN: Wireless Local Area Network) communication unit, and the communication terminal device. Routing processing means for routing IP packets with the wired LAN communication unit or the wireless LAN communication unit. According to this router device, from a LAN terminal device such as a portable LAN terminal device (such as a smart horn) equipped with a wireless LAN communication unit or a PC equipped with a wired LAN communication unit, via a communication terminal device, A terrestrial cellular mobile communication system and a satellite mobile communication system can be arbitrarily selected and used.

  ADVANTAGE OF THE INVENTION According to this invention, it can share with a terrestrial cellular mobile communication system and a satellite mobile communication system with a simple structure.

Explanatory drawing which shows an example of the whole structure of the mobile communication system which can be utilized using the communication terminal device which concerns on embodiment of this invention. (A)-(d) are radio resource (time slot) allocation control in normal and emergency in a common area when the artificial geostationary satellite used for satellite mobile communication has a single beam antenna configuration in the mobile communication system of the present embodiment. The figure which shows an example. (A)-(d) are radio resource (time slot) allocation control in normal and emergency in a common area when the artificial geostationary satellite used for satellite mobile communication has a single beam antenna configuration in the mobile communication system of the present embodiment. The figure which shows the other example of. The block diagram which shows schematic structure of the conventional communication terminal device which concerns on the comparative example shared by a ground system and a satellite system. The block diagram which shows the example of 1 structure of the communication terminal device which concerns on this embodiment. The block diagram which shows the other structural example of the communication terminal device which concerns on this embodiment. The block diagram which shows the further another structural example of the communication terminal device which concerns on this embodiment. The block diagram which shows the further another structural example of the communication terminal device which concerns on this embodiment. The block diagram which shows the further another structural example of the communication terminal device which concerns on this embodiment. The block diagram which shows the further another structural example of the communication terminal device which concerns on this embodiment. The block diagram which shows the further another structural example of the communication terminal device which concerns on this embodiment. The flowchart which shows an example of the selection / switching process of the ground system and satellite system in the communication terminal device which concerns on this embodiment. The block diagram which shows an example of the router apparatus of wireless LAN incorporating the communication terminal device which concerns on this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram showing an example of the overall configuration of a mobile communication system (mobile phone system) that can be used by using a communication terminal device according to an embodiment of the present invention. The communication terminal apparatus 10 of the present embodiment can use a ground system (terrestrial cellular mobile communication system) via a terrestrial cellular base station and a satellite system (satellite mobile communication system) via an artificial geostationary satellite. In the present embodiment, a case where an artificial satellite used in the satellite mobile communication system is a geostationary satellite (hereinafter referred to as “artificial geostationary satellite”) will be described. Artificial satellites such as satellites and quasi-zenith satellites may be used.

  In FIG. 1, the mobile communication system of this embodiment is a communication relay between a base station (hereinafter referred to as “terrestrial cellular base station”) 20 capable of wireless communication with a communication terminal device 10 via a ground system and an artificial geostationary satellite 40. The satellite base station 30 capable of wireless communication with the communication terminal device 10 via the device 41, the base station device 21 of the terrestrial cellular base station 20, the base station device 31 of the satellite base station 30, and the base station control device 50 are respectively dedicated. It is connected to the core network 60 via a wired communication line (not shown) composed of a line, a general-purpose line, or the like.

  The same wireless transmission method and the same frequency band are used for wireless communication between the communication terminal device 10 and each of the communication relay devices 41 of the terrestrial cellular base station 20 and the artificial geostationary satellite 40. As a wireless transmission method, for example, a communication method of a third generation mobile communication system (3G) such as WCDMA (registered trademark) (Wideband Code Division Multiple Access) or CDMA-2000, LTE (Long Term Evolution) or LTE-Advanced A communication system, a 4th generation mobile phone communication system, and the like can be employed. Moreover, as a frequency band of the radio | wireless communication (service link) between the communication terminal devices 10, for example, in the MSS band (Uplink 1980-2010 MHz and Downlink 2170-2200 MHz) standardized by IMT (International Mobile Telecommunication) -2000 A frequency band of a predetermined band (for example, 30 MHz) can be assigned. Further, as a frequency band of wireless communication (feeder link) between the communication relay device 41 of the artificial geostationary satellite 40 and the ground satellite base station 30, for example, a frequency in a predetermined band in the Ku band (up 14 GHz and down 12 GHz). Bands can be assigned.

The satellite system of FIG. 1 is an example when the artificial geostationary satellite 40 has a single beam antenna configuration. The satellite station area in which the communication relay device 41 of the artificial geostationary satellite 40 can communicate with the communication terminal device 10 is a single beam area 400 corresponding to the beam 410 indicating the direction of the antenna of the communication relay device 41. In the satellite system, the artificial geostationary satellite 40 may have a multi-beam antenna configuration. In this case, the satellite station areas in which the communication relay device 41 of the artificial geostationary satellite 40 can communicate with the communication terminal device 10 are spatially shifted from each other corresponding to the beams indicating a plurality of different directivity directions of the antenna of the communication relay device 41. Multiple beam areas.

  The communication terminal device 10 is a mobile phone, a smart horn, a mobile personal computer having a mobile communication function, or the like, and is also called a user device (UE), a mobile device, a mobile station device, or a mobile communication terminal. The communication terminal apparatus 10 is, for example, an area (hereinafter referred to as “satellite”) that is capable of wireless communication with an area (hereinafter referred to as “ground station area”) 200 capable of wireless communication with the terrestrial cellular base station 20 and a communication relay apparatus 41 of the artificial geostationary satellite 40. Station area ")) When the area 400 is in an overlapping area, the ground system and the satellite system can be used. The communication terminal device 10 can use the satellite system when it is outside the ground station area 200 and within the satellite station area 400 area.

  The terrestrial cellular base station 20 includes a base station device 21, an antenna, and the like, and can communicate with the communication terminal device 10 at a frequency f0 within the predetermined frequency band described above using a predetermined wireless transmission method (modulation method). it can. As the terrestrial cellular base station 20, for example, a wide area macro base station that covers a macro cell that is a wide area with a normal radius of several hundreds to several kilometers, or an area smaller than an area covered by a wide area macro base station ( For example, a small base station provided so as to cover a pico cell or a femto cell may be used. The macro base station is called “macro cell base station”, “Macro e-Node B”, etc., and the small base station is sometimes called “small cell base station”, “micro cell base station”.

  The satellite base station 30 includes a base station device 31, a frequency conversion device 32, an antenna, and the like similar to the base station device 21 of the terrestrial cellular base station 20, and may be called a “feeder link station”. The satellite base station 30 communicates with the communication repeater 41 of the artificial geostationary satellite 40 by converting the frequency f0 to the frequency fc for satellite communication using a predetermined wireless transmission method (modulation method) similar to the terrestrial cellular base station 20. It can be performed. The frequency conversion device 32 relays communication between the base station device 31 and the communication relay device 41 of the artificial geostationary satellite 40. The frequency f0 used in the base station device 31 and the communication relay device of the artificial geostationary satellite 40 are relayed. It functions as a frequency conversion means for performing conversion between the frequency fc for satellite communication used for communication with 41.

  The communication relay device 41 of the artificial geostationary satellite 40 has frequency conversion means for performing non-regenerative frequency conversion relay. This frequency conversion means uses a frequency f0 used for communication with the communication terminal device 10 and a satellite used for communication with the satellite base station 30 when relaying communication between the communication terminal device 10 and the satellite base station 30. Conversion to and from the communication frequency fc is performed. For example, the communication relay device 41 can convert the frequency fc of the signal received from the satellite base station 30 to f0 and communicate with the communication terminal device 10 at the frequency f0.

  The base station control device 50 allocates radio resources (frequency, time slot) for the terrestrial cellular base station 20 and the satellite base station 30 corresponding to a common area where at least a part of the area capable of wireless communication with the communication terminal device 10 overlaps. Can be controlled. That is, the base station controller 50 performs control to allocate radio resources used in the terrestrial cellular base station 20 and radio resources used in the satellite base station 30 so as not to overlap each other. In addition, the base station control device 50 performs control so that more radio resources are allocated to the satellite base station 30 than in normal times in an emergency when a part of the terrestrial cellular base station 20 fails due to a disaster or the like. For example, the base station controller 50 controls the allocation rate of radio resources allocated to the satellite base station 30 to be larger than normal in an emergency when a part of the terrestrial cellular base station 20 fails due to a disaster or the like. . These controls can be performed, for example, by transmitting predetermined control data from the base station controller 50 to the terrestrial cellular base station 20 and the satellite base station 30. Here, the “allocation rate” of radio resources allocated to the satellite base station 30 is the radio resource allocated to the satellite base station 30 among the radio resources allocated to the entire terrestrial cellular base station 20 and the satellite base station 30 in the common area. It is a ratio.

  The communication terminal device 10 is configured by using hardware such as a computer device having a CPU, a memory, and the like, and a wireless communication unit, for example. Wireless communication and the like can be performed. The terrestrial cellular base station 20 and the satellite base station 30 are configured using hardware such as a computer device having a CPU, a memory, an external communication interface unit for a core network, a wireless communication unit, and the like, and a predetermined program is executed. By doing so, it is possible to perform wireless communication with the communication terminal apparatus 10 and communication with the core network side. Further, the base station control device 50 is configured using, for example, a computer device having a CPU, a memory, and the like, and an external communication interface unit for the core network, and a predetermined program is executed so that the terrestrial cellular base station 20 and satellite base The station 30 can be controlled.

  As shown below, the mobile communication system of this embodiment can control radio resource allocation in the event of an emergency in which a part of a terrestrial cellular base station in a common area has failed due to a disaster or the like.

  FIG. 2 is a diagram showing an example of normal and emergency radio resource (frequency) allocation control in a common area when an artificial geostationary satellite used for satellite mobile communication has a single beam antenna configuration in the mobile communication system of the present embodiment. It is.

  FIGS. 2A and 2B are an overall configuration diagram and an explanatory diagram of radio resource (frequency) allocation showing an example of radio resource (frequency) allocation control in normal times of the mobile communication system of the present embodiment, respectively. In this example, the artificial geostationary satellite 40 has a single beam antenna configuration, and a plurality of ground station areas 200 overlap in a single satellite station area (beam area) 400. Moreover, the predetermined same frequency band shared by the ground system and the satellite system of this example is divided into a plurality of divided frequency bands, and each divided frequency band can be assigned as a radio resource. In the figure, f0, f1, f2, and f3 indicate the center frequencies of four consecutive divided frequency bands, respectively. Although FIG. 2 shows the case where the number of division frequency bands is four, the number of division frequency bands is not limited to this example, and may be divided into, for example, seven division frequency bands. Further, in this specification, the divided frequency bands having center frequencies of f0, f1, f2, f3,... Are omitted as appropriate, and are described as frequencies f0, f1, f2, f3,.

  2 (a) and 2 (b), the base station controller 50 synchronizes the frequency of the terrestrial cellular base station 20 and the satellite base station 30 with each other, and the terrestrial cellular base station 20 and the satellite base station in a common area. The division frequency band used in the terrestrial cellular base station 20 and the division frequency band used in the satellite base station 30 are controlled so as not to overlap each other so that they do not interfere with each other. For example, as shown in FIG. 2B, the frequencies f0, f1, and f2 are assigned to the radio resources of the ground system by the terrestrial cellular base station 20, and the frequency f3 is assigned to the radio resources of the satellite system by the satellite base station 30. In a common area where a single satellite station area (beam area) 400 and ground station area 200 overlap, communication terminal apparatus 10 communicates with terrestrial cellular base station 20 at frequencies f0, f1, and f2, and satellite base station at frequency f3. Communicate with station 30. Thereby, it is possible to reliably avoid interference between the ground system and the satellite system.

  2 (a) and 2 (b), the base station controller 50 determines the predetermined frequency band in accordance with the ratio of the communication traffic in the terrestrial cellular base station 20 and the communication traffic in the satellite base station 30. You may control the allocation rate of the radio | wireless resource (frequency) in a radio | wireless communication frame. For example, when the communication traffic in the terrestrial cellular base station 20 is larger than the communication traffic in the satellite base station 30, the frequencies f0, f1, and f2 are assigned to the radio resources of the terrestrial system by the terrestrial cellular base station 20, and vice versa. The frequency f0 is assigned to the radio resource of the terrestrial system by the terrestrial cellular base station 20. In this way, by controlling the allocation rate of radio resources (frequency) according to the communication traffic ratio of each base station 20, 30, the communication between each base station 20, 30 and the communication terminal device 10 is secured. Frequency utilization efficiency in the same frequency band can be further improved.

  2 (c) and 2 (d) each show an overall configuration showing an example of radio resource (frequency) allocation control in an emergency when one of the two terrestrial cellular base stations 20 of the mobile communication system of the present embodiment has failed. It is explanatory drawing of a figure and radio | wireless resource (frequency) allocation. In the case of an emergency in this example, for example, due to a disaster such as an earthquake, a failure occurs in one of the terrestrial cellular base stations 20 marked with X in the figure, and the ratio of communication traffic of the terrestrial system by the terrestrial cellular base station 20 is low. It has become. Therefore, the base station controller 50 controls to decrease the number of divided frequency bands allocated to the ground system and increase the number of divided frequency bands allocated to the satellite system. For example, as shown in FIG. 2D, the frequency f0 is assigned to the radio resources of the ground system, and the frequencies f1, f2, and f3 are assigned to the radio resources of the satellite system. Thereby, the mobile communication service using the communication terminal device 10 can be used more reliably in the common area while maintaining the frequency use efficiency used for mobile communication.

  FIG. 3 shows another example of normal and emergency radio resource (time slot) allocation control in a common area when an artificial geostationary satellite used for satellite mobile communication has a single beam antenna configuration in the mobile communication system of this embodiment. FIG.

  FIGS. 3A and 3B are an overall configuration diagram and an explanatory diagram of radio resource (time slot) allocation showing an example of radio resource (time slot) allocation control in normal times of the mobile communication system of this embodiment, respectively. is there. In this example, as in the case of FIG. 2 described above, the artificial geostationary satellite 40 has a single beam antenna configuration, and a plurality of ground station areas 200 overlap in a single satellite station area (beam area) 400. It is an example. Also, a predetermined radio communication frame shared by the ground system and the satellite system of this example is divided into a plurality of time slots, and each time slot can be assigned as a radio resource. Although FIG. 3 shows a case where the number of time slots is four, the number of time slots is not limited to this example.

  3 (a) and 3 (b), the base station controller 50 synchronizes the terrestrial cellular base station 20 and the satellite base station 30 with each other in time so that the terrestrial cellular base station 20 and the satellite base station 30 In order to prevent interference, control is performed to allocate a time slot used in the terrestrial cellular base station 20 and a time slot used in the satellite base station 30 so as not to overlap each other in a predetermined radio communication frame. For example, as shown in FIG. 3B, time slots T0, T1, and T2 are allocated to the radio resources of the ground system by the terrestrial cellular base station 20, and the time slot T3 is allocated to the radio resources of the satellite system by the satellite base station 30. . In a common area where the single satellite station area (beam area) 400 and the ground station area 200 overlap, the communication terminal apparatus 10 communicates with the terrestrial cellular base station 20 in the time slots T0, T1, and T2, and in the time slot T3. Communicate with the satellite base station 30. Thereby, it is possible to reliably avoid interference between the ground system and the satellite system.

  3 (a) and 3 (b), the base station controller 50 determines whether the predetermined radio communication frame is in accordance with the ratio of the communication traffic in the terrestrial cellular base station 20 and the communication traffic in the satellite base station 30. The allocation rate of radio resources (time slots) may be controlled. For example, when the communication traffic in the terrestrial cellular base station 20 is larger than the communication traffic in the satellite base station 30, the time slots T0, T1, T2 are allocated to the radio resources of the terrestrial system by the terrestrial cellular base station 20, and vice versa. The time slot T0 is allocated to the radio resource of the terrestrial system by the terrestrial cellular base station 20. In this way, by controlling the allocation rate of radio resources (time slots) according to the communication traffic ratio of each base station 20, 30, while ensuring communication between each base station 20, 30 and the communication terminal device 10. The frequency utilization efficiency in the same frequency band can be further improved.

  3 (c) and 3 (d) each show an example of radio resource (time slot) allocation control in an emergency when a failure occurs in one of the two terrestrial cellular base stations 20 of the mobile communication system of the present embodiment. It is a block diagram and explanatory drawing of radio | wireless resource (time slot) allocation. In the case of an emergency in this example, for example, due to a disaster such as an earthquake, a failure occurs in one of the terrestrial cellular base stations 20 marked with X in the figure, and the ratio of communication traffic of the terrestrial system by the terrestrial cellular base station 20 is low. It has become. Therefore, the base station controller 50 controls to decrease the number of time slots allocated to the ground system and increase the number of time slots allocated to the satellite system. For example, as shown in FIG. 3D, time slot T0 is allocated to the radio resource of the ground system, and time slots T1, T2, and T3 are allocated to the radio resource of the satellite system. Thereby, the mobile communication service using the communication terminal device 10 can be used more reliably in the common area while maintaining the frequency use efficiency used for mobile communication.

  As described above, in the mobile communication system of the present embodiment, the ground system and the satellite system can be used in the common area, but the radio transmission environment (wireless transmission conditions) is greatly different between the ground system and the satellite system. Therefore, when the ground system and the satellite system are shared by the same communication terminal device, the communication terminal device needs to cope with the radio transmission environments of the ground system and the satellite system.

For example, the maximum transmission distance in the ground system is 100 [km], the round trip is 200 [km], and the round trip transmission delay time is 0.66 [milliseconds]. On the other hand, in the satellite system, the transmission distance to the artificial geostationary satellite 40 is 36,000 [km], and the satellite base station (ground) 30 → the communication relay device 41 → the communication terminal device 10 → the communication relay device 41 → the satellite base station. It is 144,000 [km] for 30 round trips (ground), and the round trip transmission delay time is about 500 [milliseconds].

  The transmission distance of the ground system is 100 km at maximum, whereas the artificial geostationary satellite 40 is located at 36,000 [km] on the ground, and the transmission distance of the satellite system is about 360 times longer than that of the ground system. Therefore, the propagation loss of the satellite system is about 50 [dB] larger than that of the ground system in terms of free space loss.

Thus, the radio transmission environment (radio transmission conditions) is greatly different between the ground system and the satellite system. Therefore, in the communication terminal device 10 shared by the ground system and the satellite system, as shown in Table 1, the ground system and the satellite system require different transmission powers and antenna systems. Further, the ground system and the satellite system, as shown in Table 2 a plurality of types of system parameters (modulation scheme, coding rate of error correction code, the maximum number of retransmissions of retransmission control, reception bar Tsu fur amount for storing received data Etc.) different values are required.

  FIG. 4 is a block diagram showing a schematic configuration of a conventional communication terminal apparatus according to a comparative example shared by the ground system and the satellite system. As described above, since the radio transmission environment (radio transmission conditions) differs greatly between the ground system and the satellite system, the conventional communication terminal device 90 shared by the ground system and the satellite system as shown in FIG. The dedicated terminal devices 91 and 90 optimized (specialized) are combined. The dedicated terminal device 91 for the ground system and the dedicated terminal device 92 for the satellite system have antennas 911 and 921, DUPs (Duplexers) 912 and 922, reception power amplifiers 913 and 923, and transmission power amplifiers 914 and 924, respectively. And baseband units 915 and 925. Further, the dedicated terminal device 91 for the ground system has a storage unit 916 in which values of system parameters of the ground system used in the baseband unit 915 are written (preset). On the other hand, the dedicated terminal device 9 for the satellite system has a storage unit 926 in which the values of the system parameters of the satellite system used in the baseband unit 915 are written (preset).

  As shown in FIG. 4, the conventional communication terminal device 90 shared by the ground system and the satellite system includes a useless overlapping configuration in which the dedicated terminal devices 91 and 90 of each system are simply combined. Therefore, in the present embodiment, as shown below, the communication terminal device 10 is configured to be shared by the ground system and the satellite system with a simpler configuration than the conventional communication terminal device.

FIG. 5 is a block diagram illustrating a configuration example of the communication terminal device 10 according to the present embodiment.
In FIG. 5, the communication terminal device 10 includes a first antenna 11 used for wireless communication with the terrestrial cellular base station 20 in the ground system, and a second antenna 12 used for wireless communication with the artificial geostationary satellite 40 in the satellite system. And an antenna changeover switch (SW) 181 as an antenna changeover means. The first antenna 11 is, for example, a linear antenna corresponding to the vertical polarization of the ground system, and the second antenna 12 is a helical antenna or a patch antenna corresponding to the circular polarization of the satellite system. The antenna changeover switch 181 switches between the first antenna 11 and the second antenna 12 according to the selected ground system or satellite system.

  Furthermore, the communication terminal apparatus 10 includes a baseband unit 13 as a shared baseband processing means and a storage device 14 as a storage means for storing a system parameter group used for the baseband unit 13. The baseband unit 13 processes the reception signal R and the transmission signal T based on a system parameter group composed of values set in advance for each of a plurality of types of system parameters defined in common for the ground system and the satellite system.

  The baseband unit 13 generates a transmission signal by modulating transmission data based on a predetermined wireless transmission method (for example, a wireless transmission method specified by LTE of 3GPP or LTE-Advanced), or generates a reception signal. A process of demodulating and acquiring data is executed. For the processing in the baseband unit 13, the first system parameter group optimized for the ground system or the second system parameter group optimized for the satellite system is used.

The storage device 14 stores a first system parameter group optimized for the ground system and a second system parameter group optimized for the satellite system as system parameter groups used for the baseband unit 13. A plurality of types of system parameters, for example, modulation scheme, coding rate of error correction code, the maximum number of retransmissions of retransmission control, a reception server Tsu fur amount for storing received data. The value of the first system parameter group optimized for the ground system and the value of the second system parameter group optimized for the satellite system are values corresponding to the settings exemplified in Table 2 above, for example.

  In addition, the communication terminal apparatus 10 includes power amplification means 15 that amplifies the power of each of the reception signal R input to the baseband unit 13 and the transmission signal T output from the baseband unit 13. The power amplifying means 15 of this configuration example includes a common low noise received power amplifier (hereinafter referred to as “received power amplifier”) 151 used for power amplification of the received signal R of each of the ground system and the satellite system, and the ground system. A first transmission power amplifier 152 used for power amplification of the transmission signal T and a second transmission power amplifier 153 used for power amplification of the transmission signal T of the satellite system are included. The first transmission power amplifier 152 amplifies the power of the transmission signal T of the ground system so that the transmission power becomes 0.2 [W], for example. Further, the second transmission power amplifier 153 amplifies the power of the transmission signal T of the satellite system so that the transmission power becomes 1 [W], for example.

  In the configuration example of FIG. 5, the first antenna 11 and the first transmission power amplifier 152 are components 10A dedicated to the ground system, and the second antenna 12 and the first transmission power amplifier 153 are configurations dedicated to the satellite system. Element 10B.

  The path of the reception signal R received by the antennas 11 and 12 and the path of the transmission signal toward the antennas 11 and 12 are separated by a DUP (Duplexer: duplexer) 171. Further, the path of the transmission signal T passing through the first transmission power amplifier 152 and the path of the transmission signal T passing through the second transmission power amplifier 153 are switched by transmission path switching switches (SW) 182 and 183.

  In addition, the communication terminal device 10 includes a selection unit that selects one of the ground system and the satellite system, and a first system stored in the storage device 14 according to the ground system or the satellite system selected by the selection unit. And a control device 16 as control means for controlling the parameter group or the second system parameter group to be used in the baseband unit 13. The control device 16 is composed of, for example, a CPU and a memory such as a RAM and a ROM, and functions as the control means by reading and executing a predetermined control program. In addition, the control device 16 in the present embodiment also functions as a selection unit that selects either the terrestrial system or the satellite system based on a base station identifier or received power included in a common control signal described later.

  The communication terminal device 10 may include a display unit such as a liquid crystal panel having a touch panel function connected to the control device 16 and an operation unit such as an operation button. In this case, a display unit or an operation unit may be used as the selection unit so that the user can arbitrarily select either the ground system or the satellite system.

  In the communication terminal device 10 having the configuration example of FIG. 5, when the ground system is selected, the reception signal R received from the terrestrial cellular base station 20 received by the first antenna 11 is amplified by the reception power amplifier 151. The baseband unit 13 performs processing so as to obtain original data based on the first system parameter group. In addition, the transmission signal T generated from the transmission target data in the baseband unit 13 based on the first system parameter group is supplied with predetermined power (for example, 0.2 [W] by the first transmission power amplifier 152 for the ground system. ]) And then transmitted from the first antenna 11 to the terrestrial cellular base station 20.

  On the other hand, when the satellite system is selected, the received signal R from the artificial satellite 40 received by the second antenna 12 is amplified by the reception power amplifier 151 and then the second system parameter in the baseband unit 13. Processing is performed to obtain the original data based on the group. In addition, the transmission signal T generated from the data to be transmitted based on the second system parameter group in the baseband unit 13 is transmitted to a predetermined power (for example, 1 [W]) by the second transmission power amplifier 153 for the satellite system. ) And then transmitted from the second antenna 12 toward the artificial geostationary satellite 40.

  As described above, in the communication terminal device 10 having the configuration example of FIG. 5, the first or second system optimized using the dedicated antennas 11 and 12 according to the mobile communication system selected from the ground system and the satellite system. Since the parameter group can be used in the baseband unit 13, wireless communication corresponding to the wireless transmission environment of the selected mobile communication system becomes possible. Moreover, the ground system and the satellite system can be easily switched by switching the antennas 11 and 12 and the system parameter group. In addition, since the baseband unit 13 that processes the received signal and the transmitted signal based on the system parameter group can be shared by the ground system and the satellite system, the groundband system and the satellite system each have a dedicated baseband unit. Thus, a simple configuration can be achieved.

  In particular, in the communication terminal device 10 having the configuration example of FIG. 5, dedicated transmission power amplifiers 152 and 153 can be used in accordance with the mobile communication system selected from the ground system and the satellite system, so that the gain of the amplifier is adjusted. Therefore, the power amplification of the transmission signal corresponding to the radio transmission environment of the selected mobile communication system becomes possible, and an optimum power amplifier with low power consumption can be used in consideration of power efficiency. Further, since the reception power amplifier 151 can be shared by both the ground system and the satellite system, a simpler configuration can be achieved.

FIG. 6 is a block diagram illustrating another configuration example of the communication terminal apparatus 10 according to the present embodiment. In the communication terminal device 10 of FIG. 6, the same reference numerals are given to portions common to FIG. 5, and description thereof is omitted.
The power amplifying means 15 in the communication terminal device 10 of FIG. 6 includes a common received power amplifier 151 used for power amplification of the received signal R of each of the terrestrial system and the satellite system, and the transmission signal T of each of the terrestrial system and the satellite system. And a shared transmission power amplifier 154 used for power amplification. The gain of the shared transmission power amplifier 154 is controlled by the control device 16 in accordance with the selection of the ground system and the satellite system within the maximum output power. For example, when the ground system is selected, the output power is a predetermined power (for example, 0.2 [W]) corresponding to the ground system, and when the satellite system is selected, the output power is a predetermined power corresponding to the satellite system. The gain of the transmission power amplifier 154 is controlled so as to be (for example, 1 [W]).

  In the communication terminal device 10 having the configuration example of FIG. 6, when the terrestrial system is selected, the reception signal R received from the terrestrial cellular base station 20 received by the first antenna 11 is amplified by the reception power amplifier 151. The baseband unit 13 performs processing so as to obtain original data based on the first system parameter group. In addition, the transmission signal T generated from the data to be transmitted based on the first system parameter group in the baseband unit 13 is transmitted to a predetermined power (for example, 0.2 by the transmission power amplifier 154 controlled to the gain for the ground system). [W]) and then transmitted from the first antenna 11 toward the terrestrial cellular base station 20.

  On the other hand, when the satellite system is selected, the received signal R from the artificial satellite 40 received by the second antenna 12 is amplified by the reception power amplifier 151 and then the second system parameter in the baseband unit 13. Processing is performed to obtain the original data based on the group. In addition, the transmission signal T generated from the transmission target data in the baseband unit 13 based on the second system parameter group is transmitted to a predetermined power (for example, 1 [ W]) and then transmitted from the second antenna 12 toward the artificial geostationary satellite 40.

  As described above, in the communication terminal device 10 having the configuration example of FIG. 6, the first or second system optimized using the dedicated antennas 11 and 12 according to the mobile communication system selected from the ground system and the satellite system. Since the parameter group can be used in the baseband unit 13, wireless communication corresponding to the wireless transmission environment of the selected mobile communication system becomes possible. Moreover, the ground system and the satellite system can be easily switched by switching the antennas 11 and 12 and the system parameter group. In addition, since the baseband unit 13 that processes the received signal and the transmitted signal based on the system parameter group can be shared by the ground system and the satellite system, the groundband system and the satellite system each have a dedicated baseband unit. Thus, a simple configuration can be achieved.

  In particular, in the communication terminal device 10 having the configuration example of FIG. 6, the transmission power amplifier 154 can be shared by both the terrestrial system and the satellite system, so that the configuration can be further simplified.

FIG. 7 is a block diagram showing still another configuration example of the communication terminal apparatus 10 according to the present embodiment. In the communication terminal device 10 of FIG. 7, the same reference numerals are given to portions common to FIGS. 5 and 6, and description thereof is omitted.
In the configuration example of FIG. 7, the first antenna 11, the first reception power amplifier 155, the first transmission power amplifier 152, and the first DUP 172 are provided as the component 10 </ b> A dedicated to the ground system. The component 10B dedicated to the satellite system includes a second antenna 12, a first reception power amplifier 156, a second transmission power amplifier 153, and a second DUP 173.

  When the terrestrial system is selected in the communication terminal device 10 of the configuration example of FIG. 7, the received signal R from the terrestrial cellular base station 20 received by the first antenna 11 is the first received power for the terrestrial system. After being amplified by the amplifier 155, the baseband unit 13 is processed to obtain original data based on the first group of system parameters. In addition, the transmission signal T generated from the transmission target data in the baseband unit 13 based on the first system parameter group is supplied with predetermined power (for example, 0.2 [W] by the first transmission power amplifier 152 for the ground system. ]) And then transmitted from the first antenna 11 to the terrestrial cellular base station 20.

  On the other hand, when the satellite system is selected, the received signal R from the artificial geostationary satellite 40 received by the second antenna 12 is amplified by the second received power amplifier 151 for the satellite system, and then the baseband unit. In step 13, the original data is obtained based on the second system parameter group. In addition, the transmission signal T generated from the data to be transmitted based on the second system parameter group in the baseband unit 13 is transmitted to a predetermined power (for example, 1 [W]) by the second transmission power amplifier 153 for the satellite system. ) And then transmitted from the second antenna 12 toward the artificial geostationary satellite 40.

  As described above, in the communication terminal apparatus 10 having the configuration example of FIG. 7, the dedicated antennas 11 and 12, the reception power amplifiers 155 and 156, and the transmission power amplifiers 152 and 153 are selected according to the mobile communication system selected from the ground system and the satellite system. And the optimized first or second system parameter group can be used in the baseband unit 13, and wireless communication corresponding to the wireless transmission environment of the selected mobile communication system becomes possible. Moreover, the ground system and the satellite system can be easily switched by switching the antennas 11 and 12 and the system parameter group. In addition, since the baseband unit 13 that processes the received signal and the transmitted signal based on the system parameter group can be shared by the ground system and the satellite system, the groundband system and the satellite system each have a dedicated baseband unit. Thus, a simple configuration can be achieved.

  FIG. 8 is a block diagram showing still another configuration example of the communication terminal apparatus 10 according to the present embodiment. In the communication terminal device 10 of FIG. 8, the same reference numerals are given to portions common to FIGS. 5 to 7, and description thereof is omitted. Further, in the example of FIG. 8, a case where two antennas 11 for the ground system and two antennas 12 for the satellite system are provided is shown, but a plurality of other than the two antennas (for example, four antennas) are provided. It may be. In addition, in the case where a plurality of antennas are provided, it is used when the ground system and the satellite system perform wireless communication (hereinafter referred to as “MIMO communication” as appropriate) using actual MIMO (Multi-Input-Multi-Output) technology. The number of antennas to be switched may be switched.

  The communication terminal apparatus 10 of FIG. 8 includes a first wireless communication unit 101 including antennas 11 (1) and 12 (1), two antennas 11 (2), and 12 (1) as two sets of wireless communication units for performing MIMO communication. And a second wireless communication unit 102 including 12 (2). By performing MIMO communication using a plurality of antennas for transmission and reception, communication quality and communication speed (throughput) can be greatly improved. For example, by performing MIMO communication with two transmission / reception antennas, the communication speed can be improved almost twice by wireless transmission with the same bandwidth.

  As in the configuration example of FIG. 6, the first wireless communication unit 101 uses the first antenna 11 (1), the second antenna 12 (1), the common reception power amplifier 151 (1), and the common transmission power. An amplifier 154 (1), a DUP 171 (1), and an antenna changeover switch 181 (1) are included. Similarly, the second wireless communication unit 102 includes the first antenna 11 (2), the second antenna 12 (2), the common reception power amplifier 151 (2), and the common transmission power amplifier 154 (2). It has a DUP 171 (2) and an antenna changeover switch 181 (2).

  In the communication terminal device 10 of the configuration example of FIG. 8, when a ground system is selected, a received signal from the ground cellular base station 20 received by a pair of antennas 11 (1) and 11 (2) for the ground system. R1 and R2 are amplified by the reception power amplifiers 151 (1) and 151 (2), respectively, and then processed in the baseband unit 13 so as to obtain original data based on the first system parameter group. In addition, a set of transmission signals T1 and T2 generated from data to be transmitted based on the first system parameter group in the baseband unit 13 are respectively transmitted power amplifiers 154 (1 ), 154 (2) is amplified to a predetermined power (for example, 0.2 [W]), and then transmitted from the antennas 11 (1), 11 (2) to the terrestrial cellular base station 20.

  On the other hand, when the satellite system is selected, the received signals R1, R2 from the artificial geostationary satellite 40 received by the set of antennas 12 (1), 12 (2) for the satellite system are respectively received power amplifiers 151 ( After being amplified in 1) and 151 (2), the baseband unit 13 is processed so as to obtain original data based on the second system parameter group. In addition, a set of transmission signals T1 and T2 generated from data to be transmitted based on the second system parameter group in the baseband unit 13 are respectively transmitted power amplifiers 154 (1) controlled to a gain for the satellite system. ), 154 (2) is amplified to a predetermined power (for example, 1 [W]), and then transmitted from the antennas 12 (1), 12 (2) to the artificial geostationary satellite 40.

  As described above, in the communication terminal device 10 having the configuration example of FIG. 8, the dedicated antennas 11 (1) and 11 (2) or the antennas 12 (1) and 12 are selected according to the mobile communication system selected from the ground system and the satellite system. Since the baseband unit 13 can use the optimized first or second system parameter group using (2), MIMO wireless communication corresponding to the wireless transmission environment of the selected mobile communication system is possible. become. Further, the ground system and the satellite system can be easily switched by switching the antennas 11 (1), 11 (2), 12 (1), 12 (2) and the system parameter group. In addition, since the baseband unit 13 that processes the received signal and the transmitted signal based on the system parameter group can be shared by the ground system and the satellite system, the groundband system and the satellite system each have a dedicated baseband unit. Thus, a simple configuration can be achieved.

  In the configuration example of FIG. 8, MIMO wireless communication is performed in both the ground system and the satellite system. However, MIMO wireless communication may be performed only in the ground system.

  FIG. 9 is a block diagram showing still another configuration example of the communication terminal apparatus 10 according to the present embodiment. In the communication terminal device 10 of this configuration example, wireless communication using one antenna is performed during transmission, and MIMO wireless communication using two antennas is performed during reception. In the communication terminal device 10 of FIG. 9, the same reference numerals are given to portions common to FIGS. 5 to 8, and description thereof is omitted.

  The power amplifying means 15 in the communication terminal apparatus 10 of FIG. 9 includes a shared reception power amplifier 151 (1) and a shared transmission power amplifier 154 (1) provided in the first wireless communication unit 101, and a second wireless communication unit 101. And a common reception power amplifier 151 (2) provided in the communication unit 102. The gain of the transmission power amplifier 154 (1) shared by the first wireless communication unit 101 is controlled by the control device 16 according to the selection of the ground system and the satellite system within the maximum output power. For example, when the ground system is selected, the output power is a predetermined power (for example, 0.2 [W]) corresponding to the ground system, and when the satellite system is selected, the output power is a predetermined power corresponding to the satellite system. The gain of the transmission power amplifier 154 (1) is controlled to be (for example, 1 [W]).

  As in the configuration example of FIG. 6, the first wireless communication unit 101 uses the first antenna 11 (1), the second antenna 12 (1), the common reception power amplifier 151 (1), and the common transmission power. An amplifier 154 (1), a DUP 171 (1), and an antenna changeover switch 181 (1) are included. On the other hand, the second wireless communication unit 102 includes a first antenna 11 (2), a second antenna 12 (2), a common reception power amplifier 151 (2), and an antenna changeover switch 181 (2).

  In the communication terminal device 10 of the configuration example of FIG. 9, when a ground system is selected, a received signal from the ground cellular base station 20 received by a pair of antennas 11 (1) and 11 (2) for the ground system. R1 and R2 are amplified by the reception power amplifiers 151 (1) and 151 (2), respectively, and then processed in the baseband unit 13 so as to obtain original data based on the first system parameter group. Also, the transmission signal T1 generated from the transmission target data in the baseband unit 13 based on the first system parameter group is transmitted power amplifier 154 controlled by the first wireless communication unit 101 to the gain for the ground system. After being amplified to a predetermined power (for example, 0.2 [W]) in (1), it is transmitted from the antenna 11 (1) to the terrestrial cellular base station 20.

  On the other hand, when the satellite system is selected, the received signals R1, R2 from the artificial geostationary satellite 40 received by the set of antennas 12 (1), 12 (2) for the satellite system are respectively received power amplifiers 151 ( After being amplified in 1) and 151 (2), the baseband unit 13 is processed so as to obtain original data based on the second system parameter group. In addition, the transmission signal T1 generated from the transmission target data in the baseband unit 13 based on the second system parameter group is transmitted to a predetermined power (transmission power amplifier 154 (1) controlled to a gain for the satellite system. For example, after being amplified to 1 [W]), it is transmitted from the antenna 12 (1) toward the artificial geostationary satellite 40.

  As described above, in the communication terminal device 10 having the configuration example of FIG. 9, the dedicated antennas 11 (1) and 11 (2) or the antennas 12 (1) and 12 are selected according to the mobile communication system selected from the ground system and the satellite system. Since the baseband unit 13 can use the optimized first or second system parameter group using (2), MIMO wireless communication corresponding to the wireless transmission environment of the selected mobile communication system is possible. become. Further, the ground system and the satellite system can be easily switched by switching the antennas 11 (1), 11 (2), 12 (1), 12 (2) and the system parameter group. In addition, since the baseband unit 13 that processes the received signal and the transmitted signal based on the system parameter group can be shared by the ground system and the satellite system, the groundband system and the satellite system each have a dedicated baseband unit. Thus, a simple configuration can be achieved.

  In particular, the communication terminal apparatus 10 having the configuration example of FIG. 9 can perform MIMO communication at the time of reception of each of the ground system and the satellite system.

  FIG. 10 is a block diagram showing still another configuration example of the communication terminal apparatus 10 according to the present embodiment. In the communication terminal device 10 of this configuration example, as a satellite system antenna, a right-handed circularly polarized wave (hereinafter referred to as “right-handed polarized wave”) and a left-turned circularly polarized light whose polarization planes rotate in opposite directions. A shared antenna 120 that performs transmission and reception of each wave (hereinafter referred to as “left-handed polarization”) with one antenna is provided. In the communication terminal device 10 of FIG. 10, the same reference numerals are given to portions common to FIGS. 5 to 9, and description thereof is omitted.

  The first wireless communication unit 101 includes a reception power amplifier 151 (1) shared with the first antenna 11 (1), a transmission power amplifier 154 (1) shared with the DUP 171 (1), and an antenna changeover switch 181 (1). And have. Similarly, the second wireless communication unit 102 includes a reception power amplifier 151 (2) shared with the first antenna 11 (2), a transmission power amplifier 154 (2) shared with the DUP 171 (2), and an antenna changeover switch 181. (2) In addition, a common antenna 120 used for MIMO communication of the satellite system by the first wireless communication unit 101 and the second wireless communication unit 102 is provided. The shared antenna 120 can simultaneously transmit and receive right-handed and left-handed polarized waves with one antenna.

  In the communication terminal device 10 having the configuration example of FIG. 10, when a ground system is selected, a received signal from the ground cellular base station 20 received by a set of antennas 11 (1) and 11 (2) for the ground system. R1 and R2 are amplified by the reception power amplifiers 151 (1) and 151 (2), respectively, and then processed in the baseband unit 13 so as to obtain original data based on the first system parameter group. In addition, a set of transmission signals T1 and T2 generated from data to be transmitted based on the first system parameter group in the baseband unit 13 are respectively transmitted power amplifiers 154 (1 ), 154 (2) is amplified to a predetermined power (for example, 0.2 [W]), and then transmitted from the antennas 11 (1), 11 (2) to the terrestrial cellular base station 20 with linearly polarized waves. .

  On the other hand, when the satellite system is selected, the received signals R1 and R2 of the right-handed polarization and the left-handed polarization received from the artificial geostationary satellite 40 received by the common antenna 120 for the satellite system are respectively received power amplifiers 151. After being amplified in (1) and 151 (2), the baseband unit 13 is processed to obtain the original data based on the second system parameter group. In addition, a set of transmission signals T1 and T2 generated from data to be transmitted based on the second system parameter group in the baseband unit 13 are respectively transmitted power amplifiers 154 (1) controlled to a gain for the satellite system. ), 154 (2), and after being amplified to a predetermined power (for example, 1 [W]), simultaneously transmitted to the artificial geostationary satellite 40 from the shared antenna 120 as radio signals of right-handed polarization and left-handed polarization. Is done.

  As described above, the communication terminal apparatus 10 having the configuration example of FIG. 10 uses the dedicated antenna 11 (1), 11 (2) or the shared antenna 120 according to the mobile communication system selected from the ground system and the satellite system and is optimal. Since the baseband unit 13 can use the converted first or second system parameter group, MIMO wireless communication corresponding to the wireless transmission environment of the selected mobile communication system becomes possible. Further, the ground system and the satellite system can be easily switched by switching the antennas 11 (1), 11 (2), the shared antenna 120, and the system parameter group. In addition, since the baseband unit 13 that processes the received signal and the transmitted signal based on the system parameter group can be shared by the ground system and the satellite system, the groundband system and the satellite system each have a dedicated baseband unit. Thus, a simple configuration can be achieved.

  In particular, the communication terminal apparatus 10 having the configuration example of FIG. 10 can perform the MIMO communication of the satellite system with the single shared antenna 120, and thus can have a simpler configuration.

  FIG. 11 is a block diagram showing still another configuration example of the communication terminal apparatus 10 according to the present embodiment. In the communication terminal device 10 of this configuration example, the antenna for the satellite system and the common antenna 120 for transmitting and receiving the right-handed polarized wave and the left-handed polarized wave with one antenna, and two types of polarization planes orthogonal to each other as the antenna for the ground system A shared antenna 110 is provided that transmits and receives linearly polarized waves (vertically polarized waves and horizontally polarized waves, or + 45 ° polarized waves and −45 ° polarized waves) with one antenna. In the communication terminal device 10 of FIG. 11, the same reference numerals are given to portions common to FIGS. 5 to 10, and description thereof is omitted.

  The first wireless communication unit 101 includes a common reception power amplifier 151 (1), a common transmission power amplifier 154 (1), a DUP 171 (1), and an antenna changeover switch 181 (1). Similarly, the second wireless communication unit 102 includes a common reception power amplifier 151 (2), a common transmission power amplifier 154 (2), a DUP 171 (2), and an antenna changeover switch 181 (2). In addition, a common antenna 120 used for MIMO communication of the satellite system by the first wireless communication unit 101 and the second wireless communication unit 102 is provided. The shared antenna 120 can simultaneously transmit and receive right-handed and left-handed polarized waves with one antenna. Furthermore, a common antenna 110 used for ground system MIMO communication by the first wireless communication unit 101 and the second wireless communication unit 102 is provided. The common antenna 110 simultaneously transmits and receives two types of linearly polarized waves (vertical polarization and horizontal polarization, or + 45 ° polarization and −45 ° polarization) whose polarization planes are orthogonal to each other, using one antenna. Can do.

  When the terrestrial system is selected in the communication terminal device 10 of the configuration example of FIG. 11, two types of linearly polarized received signals R1, received from the terrestrial cellular base station 20 received by the common antenna 110 for the terrestrial system. R2 is amplified by the reception power amplifiers 151 (1) and 151 (2), respectively, and then processed in the baseband unit 13 so as to obtain original data based on the first system parameter group. In addition, a set of transmission signals T1 and T2 generated from data to be transmitted based on the first system parameter group in the baseband unit 13 are respectively transmitted power amplifiers 154 (1 ), 154 (2), after being amplified to a predetermined power (for example, 0.2 [W]), it is simultaneously transmitted from the shared antenna 110 to the terrestrial cellular base station 20 as two types of linearly polarized radio signals. .

  On the other hand, when the satellite system is selected, the received signals R1 and R2 of the right-handed polarization and the left-handed polarization received from the artificial geostationary satellite 40 received by the common antenna 120 for the satellite system are respectively received power amplifiers 151. After being amplified in (1) and 151 (2), the baseband unit 13 is processed to obtain the original data based on the second system parameter group. In addition, a set of transmission signals T1 and T2 generated from data to be transmitted based on the second system parameter group in the baseband unit 13 are respectively transmitted power amplifiers 154 (1) controlled to a gain for the satellite system. ), 154 (2), and after being amplified to a predetermined power (for example, 1 [W]), simultaneously transmitted to the artificial geostationary satellite 40 from the shared antenna 120 as radio signals of right-handed polarization and left-handed polarization. Is done.

  As described above, the communication terminal device 10 having the configuration example of FIG. 11 uses the shared antenna 110 or the shared antenna 120 and is optimized according to the mobile communication system selected from the ground system and the satellite system. Since the baseband unit 13 can use these system parameter groups, MIMO wireless communication corresponding to the wireless transmission environment of the selected mobile communication system becomes possible. Further, the ground system and the satellite system can be easily switched by switching the shared antenna 110, the shared antenna 120, and the system parameter group. In addition, since the baseband unit 13 that processes the received signal and the transmitted signal based on the system parameter group can be shared by the ground system and the satellite system, the groundband system and the satellite system each have a dedicated baseband unit. Thus, a simple configuration can be achieved.

  In particular, the communication terminal apparatus 10 having the configuration example of FIG. 11 can perform MIMO communication of the ground system and the satellite system by using the shared antenna 110 and the shared antenna 120, so that the configuration can be simplified.

FIG. 12 is a flowchart illustrating an example of selection / switching processing of the ground system and the satellite system in the communication terminal device according to the present embodiment.
In FIG. 12, when the power of the communication terminal apparatus 10 is turned on (S101), the ground system is selected (S102), and the system is switched to the antenna 11 for the ground system and the first system parameter group. Next, it is determined whether or not the power (reception power) of the received signal received from the terrestrial cellular base station 20 of the terrestrial system is greater than a predetermined first threshold value Pth1 (S103). When the received power of the ground system is equal to or lower than the first threshold value Pth1 (NO in S103), the ground system is switched to the satellite system (S104), and the satellite system antenna 12 and the second system parameter group are switched.

  Next, it is determined whether or not the received power received from the artificial geostationary satellite 40 of the satellite system is larger than a predetermined second threshold Pth2 (S105). When the received power of the satellite system is larger than the second threshold value Pth2 (NO in S105), the base station identifier in the common control signal included in the received signal is received (S106), and the reception is performed based on the base station identifier. It is determined whether the signal is a satellite system received signal (S107). Here, if it is determined that the received signal is a satellite system reception signal (YES in S107), reception by the satellite system is continued (S108). On the other hand, if it is determined that the received signal is not a satellite system received signal (NO in S107), the system is switched to the ground system (S102).

  If the received power of the ground system is larger than the first threshold value Pth1 in step S103 (YES in S103), reception on the ground system is continued (S109). Next, a base station identifier in the common control signal included in the received signal is received (S110), and based on the base station identifier, it is determined whether the received signal is a received signal of the ground system (S111). ). Here, if it is determined that the signal is a reception signal of the ground system (YES in S111), reception by the ground system is continued (S112). On the other hand, when it is determined that the received signal is not a received signal of the ground system (NO in S111), the satellite system is switched (S104).

  According to the selection / switching process of the terrestrial system and satellite system in FIG. 12 described above, the terrestrial system having a more stable wireless transmission environment during normal use can be preferentially used, and the received signal from the terrestrial system becomes weak for some reason. In the event of a satellite system.

  In the terrestrial system and satellite system selection / switching process of FIG. 12, it is determined in step S103 whether or not the received power received from the terrestrial cellular base station 20 of the terrestrial system is greater than the first threshold value Pth1. However, it may be determined whether the received power is equal to or greater than the first threshold value Pth1. In step S105, it is determined whether the received power received from the artificial geostationary satellite 40 of the satellite system is greater than the second threshold Pth1, but whether the received power is greater than or equal to the second threshold Pth1 is determined. You may judge.

FIG. 13 is a block diagram illustrating an example of a wireless LAN router device incorporating the communication terminal device according to the present embodiment.
In FIG. 13, the router device 70 includes the communication terminal device 10 of any of the above-described FIGS. 5 to 11, a wireless LAN communication unit 71, and a routing processing unit 72. The wireless LAN communication unit 71 communicates with a LAN terminal device such as a tablet 80 or a personal computer 81 having a wireless LAN communication unit via an antenna 71a via a wireless LAN such as WiFi (registered trademark). Packet communication can be performed. The routing processing unit 72 is provided so as to relay communication of IP packets between the communication terminal device 10 and the wireless LAN communication unit 71. The routing processing unit 72, for example, receives an IP packet received via a wireless LAN communication unit 71 in the router device from a wireless LAN included in a LAN terminal device such as a smart horn or tablet 80 or a personal computer 81, and the IP address of the IP packet. Is routed to other external communication terminal devices or servers via the communication terminal device 10 and the mobile communication network. In addition, the routing processing unit 72 incorporates a wireless LAN communication unit 71 that receives an IP packet received from another external communication terminal device or server via the communication terminal device 10 based on the IP address of the IP packet. Routing to a smart phone or a LAN-compatible device such as the tablet 80 or the personal computer 81 via the wireless LAN.

  According to the router device 70 of FIG. 13, a terrestrial system and a satellite system are arbitrarily selected via a wireless LAN included in a LAN terminal device such as a smart horn or a tablet 80 or a personal computer 81 and a wireless LAN communication unit in the router device 70. Can be used. Although the configuration example of FIG. 13 has been described for a wireless LAN router device, it can be similarly applied to a wired LAN router device.

  Note that the processing steps described in this specification and the components of the mobile communication system, base station, communication terminal device (user terminal device, mobile station) and router device can be implemented by various means. For example, these steps and components may be implemented in hardware, firmware, software, or a combination thereof.

  For hardware implementation, means such as a processing unit used to realize the above steps and components in an entity (for example, various wireless communication devices, Node B, communication terminal device, hard disk drive device, or optical disk drive device) Is one or more application specific ICs (ASICs), digital signal processors (DSPs), digital signal processors (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs) May be implemented in a processor, controller, microcontroller, microprocessor, electronic device, other electronic unit designed to perform the functions described herein, a computer, or combinations thereof .

  In addition, for firmware and / or software implementation, each unit used to realize the above components includes a program (for example, a procedure, a function, a module, an instruction, etc.) that executes the functions described in this specification. ). In general, any computer / processor readable medium that specifically embodies firmware and / or software code is means such as a processing unit used to implement the steps and components described herein. May be used to implement For example, firmware and / or software code may be stored in a memory and executed by a computer or a processor, for example, in a control device or a storage device. The memory may be implemented inside the computer or processor, or may be implemented outside the processor. The firmware and / or software code is, for example, random access memory (RAM), read only memory (ROM), nonvolatile random access memory (NVRAM), programmable read only memory (PROM), electrically erasable PROM (EEPROM) ), FLASH memory, floppy disk, compact disk (CD), digital versatile disk (DVD), magnetic or optical data storage, etc. Good. The code may be executed by one or more computers or processors, and may cause the computers or processors to perform the functional aspects described herein.

  Also, descriptions of embodiments disclosed herein are provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to the present disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. The present disclosure is therefore not limited to the examples and designs described herein, but should be accorded the widest scope consistent with the principles and novel features disclosed herein.

DESCRIPTION OF SYMBOLS 10 Communication terminal device 11 1st antenna 12 2nd antenna 13 Baseband unit 14 Memory | storage device 15 Power amplification means 16 Control apparatus 20 Terrestrial cellular base station 30 Satellite base station 40 Artificial geostationary satellite 41 Communication relay apparatus 50 Base station control apparatus 60 Core network 70 Router device 71 Wireless LAN communication unit 72 Routing device 101 First wireless communication unit 102 Second wireless communication unit 110 Shared antenna for MIMO communication of ground system 120 Shared antenna for MIMO communication of satellite system 151 Shared Reception power amplifier 152 first transmission power amplifier 153 second transmission power amplifier 154 shared transmission power amplifier 171 172 173 DUP
181 Antenna changeover switch 182, 183 Transmission path changeover switch 200 Ground station area 400 Satellite station area 410 Beam

JP 2014-064219 A

Tadashi Minowa and 6 others, “A ground / satellite integrated mobile communication system for safety and security”, IEICE Transactions B, Vol. J91-B, no. 12, pp. 1629-1640, 2008/12.

Claims (8)

A communication terminal device used in a mobile communication system,
A first antenna used for wireless communication with a terrestrial cellular base station in a terrestrial cellular mobile communication system;
A second antenna used for wireless communication with an artificial satellite in the satellite mobile communication system;
Shared baseband processing for processing received signals and transmitted signals based on system parameter groups each having a preset value for each of a plurality of types of system parameters defined in common for terrestrial cellular mobile communication systems and satellite mobile communication systems Means,
As the system parameter group used for the baseband processing means, a first system parameter group including a modulation scheme suitable for a terrestrial cellular mobile communication system, a coding rate of an error correction code, a maximum number of retransmissions, and a transmission / reception buffer amount , Storage means for storing a modulation system suitable for a satellite mobile communication system, a coding rate of an error correction code, a maximum number of retransmissions, and a second system parameter group including a transmission / reception buffer amount ;
Power amplifying means for amplifying the power of each of the reception signal input to the baseband processing means and the transmission signal output from the baseband processing means;
Control means for controlling to use the first system parameter group or the second system parameter group for the baseband processing means according to the selection of either the terrestrial cellular mobile communication system or the satellite mobile communication system and, with a,
The first antenna is one antenna that transmits and receives two types of linearly polarized radio waves whose polarization planes are orthogonal to each other.
The second antenna is one antenna that transmits and receives two types of circularly polarized radio waves whose polarization directions are opposite to each other.
The control means includes
When the terrestrial cellular mobile communication system is selected, perform wireless communication by MIMO using the two types of linearly polarized radio waves with the terrestrial cellular base station in the terrestrial cellular mobile communication system,
When the satellite mobile communication system is selected, communication is performed so as to perform wireless communication by MIMO using the two types of circularly polarized radio waves with an artificial satellite in the satellite mobile communication system. Terminal device. The communication terminal device according to claim 1,
Further comprising antenna switching means for switching between the first antenna and the second antenna connected to the power amplifying means in accordance with a selection of either the terrestrial cellular mobile communication system or the satellite mobile communication system;
The power amplification means includes
A common received power amplifier used for power amplification of received signals of each of the terrestrial cellular mobile communication system and the satellite mobile communication system;
A first transmission power amplifier used for power amplification of a transmission signal of a terrestrial cellular mobile communication system;
A communication terminal apparatus comprising: a second transmission power amplifier used for power amplification of a transmission signal of a satellite mobile communication system. The communication terminal device according to claim 1,
Further comprising antenna switching means for switching between the first antenna and the second antenna connected to the power amplifying means in accordance with a selection of either the terrestrial cellular mobile communication system or the satellite mobile communication system;
The power amplification means includes
A common received power amplifier used for power amplification of received signals of each of the terrestrial cellular mobile communication system and the satellite mobile communication system;
A communication terminal apparatus comprising: a common transmission power amplifier used for power amplification of transmission signals of each of a terrestrial cellular mobile communication system and a satellite mobile communication system. In the communication terminal device according to any one of claims 1 to 3 ,
The control means includes
When the terrestrial cellular mobile communication system is selected, perform wireless communication by MIMO technology only when receiving from the terrestrial cellular base station in the terrestrial cellular mobile communication system,
When the satellite mobile communication system is selected, a communication terminal apparatus is controlled to perform wireless communication using MIMO technology only when receiving from an artificial satellite in the satellite mobile communication system. In the communication terminal device in any one of Claims 1 thru | or 4 ,
A communication terminal apparatus comprising selection means for selecting one of a terrestrial cellular mobile communication system and a satellite mobile communication system based on a base station identifier in a common control signal included in a received signal. In the communication terminal device in any one of Claims 1 thru | or 5 ,
With the terrestrial cellular mobile communication system selected, the received power of the terrestrial cellular mobile communication system is compared with the first threshold,
If the received power of the terrestrial cellular mobile communication system is greater than or equal to the first threshold or greater than the first threshold, continue to select the terrestrial cellular mobile communication system,
When the received power of the terrestrial cellular mobile communication system is smaller than the first threshold value or lower than the first threshold value, the terrestrial cellular mobile communication system is switched to the satellite mobile communication system and selected. Compare with the second threshold,
A communication terminal apparatus that continuously selects a satellite mobile communication system when the received power of the satellite mobile communication system is equal to or greater than a second threshold value or greater than a second threshold value. In the communication terminal device according to any one of claims 1 to 3 ,
Further comprising an operating means,
A communication terminal apparatus comprising selection means for selecting either a terrestrial cellular mobile communication system or a satellite mobile communication system based on a user operation of the operation means. A communication terminal device according to any one of claims 1 to 7;
A wired LAN (Local Area Network) communication unit or a wireless LAN (WLAN: Wireless Local Area Network) communication unit;
A router device comprising routing processing means for routing an IP packet between the communication terminal device and the wired LAN communication unit or the WLAN communication unit.

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