JP3908545B2 - Communication device between different radio systems - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a communication apparatus between different radio systems that uses a software defined radio to perform communication between different radio systems.
[0002]
[Prior art]
In recent years, software radios that are flexibly supporting different radio systems with a single radio have attracted attention. This software defined radio enables transmission / reception of different radio systems such as different frequencies (∪HF, VHF, HF, etc.) and different modulation systems (AM, FM, PSK, MSK, etc.) within the same hardware. This method of changing the wireless system is performed by replacing processing software such as a CPU, DSP, and FPGA. Such a software defined radio can be changed by changing the software to be executed, so there is no need to replace the hardware, and it is convenient, and if you want to use a new modulation method, you can purchase only the software. There is also an advantage that it is sufficient.
[0003]
On the other hand, there is a communication system that can flexibly handle various types of communication waves. This communication system consists of a software receiver that can automatically identify modulation schemes, identify various types of radio wave information, and perform multimode demodulation processing. Identifies the modulation scheme and frequency, and the demodulation process demodulates the identified radio waves. This communication system is often developed for application to a radio wave monitoring system.
[0004]
[Problems to be solved by the invention]
However, in a conventional communication system, communication between different wireless systems is impossible, which is an obstacle to constructing a wireless network. As a communication apparatus between different wireless systems, it is conceivable to receive a wireless system with a repeater and transmit the received content in accordance with a system different from the other. It is necessary to decide the radio system for transmission. On the other hand, if the radio system for reception and transmission has not been determined in advance, in order to support many modulation, demodulation systems and frequencies, it is necessary for many receivers to perform a scanning operation, or to change the frequency and modulation system. It is necessary to scan many radios prepared, but scanning is performed even when radio waves are not flowing, so communication is performed when communication is performed with a different radio wave when in another frequency band. Cannot be found. In this way, if the interception timing is missed, it cannot be received, but in order to solve this, it is necessary to perform the same scan at different timings, and more receivers are required, resulting in an increase in size and cost of the device. It becomes the cause of.
[0005]
An object of the present invention is to provide a different radio system that does not require a large amount of receivers and transmitters and enables communication without having prior arrangements of each other while having a plurality of radio systems in the same communication group. It is to provide a communication device.
[0006]
[Means for Solving the Problems]
The present invention has a plurality of software defined radios, and in a communication device between different radio systems for performing communication by using different radio systems between software defined radios in the same communication group,
An identification unit that receives radio waves of different radio systems having a group ID indicating the group, and identifies a frequency band and a modulation system as the radio system;
The group ID and the radio system which are the outputs of the identification unit are taken in, and the software corresponding to the frequency band and the modulation system as the radio system is distributed to one software defined radio, and the frequency band as the other radio system and If there is a software defined radio to which the software corresponding to the modulation method is distributed and has the same ID as the group ID, a bridge for a call between the software defined radio and the one software defined radio is performed. Controller
A communication device between different wireless systems is disclosed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a communication apparatus between different radio systems according to an embodiment of the present invention.
In this embodiment, two software defined radios that can be modulated and demodulated by software are used as one unit. The antenna 10 identifies and receives the identification unit 1A (scanning band range A) for identifying and receiving the radio wave A, the identification unit 1B (scanning band range B) for identifying and receiving the radio wave B, and the radio wave N. Identification units 1N (scanning band range C) are connected to each other. A controller 4 is connected to each of these identification units 1A to 1N via a hub 2. A relay 5 and a plurality of software defined radios 3A to 3N are connected to the controller 4 via the hub 2. An antenna 6 is connected to each of the software defined radios 3A to 3N. The relay 5 and the input terminals and output terminals of the software defined radios 3A to 3C are connected by cables. The controller 4 switches the relay 5 based on signals from the identification units 1 </ b> A to 1 </ b> N and the relay 5 to control the software defined radios 3 </ b> A to 3 </ b> N.
[0009]
FIG. 4 is a flowchart showing the operation of the communication apparatus between the different radio systems described above.
The identification units 1A to 1N identify and receive the radio waves A to N, respectively, with settings that are applicable to different frequency bands and modulation schemes. Now, there are cases where it is desired to exchange information between terminal devices using radio waves A and B having different frequencies and modulation methods that cannot be normally communicated. In such a case, the identification unit 1A first catches the incoming radio wave A, and the controller 4 receiving it catches the relay so that the software radio 3A receives the software with software corresponding to the frequency band and modulation method of the incoming radio wave A. 5 is controlled.
[0010]
Next, it is assumed that the identification unit 1B catches the incoming radio wave B and interrupts it in step S1 in order to exchange information although it is a different radio system. The controller 4 that has received this in step S2 determines whether or not there is already identification information of the frequency band and modulation method of the incoming radio wave A. As a result of this determination, since there is identification information, the process proceeds to step S3. Further, the controller 4 determines whether or not the identification information has already been bridged in step S3. In this case, the controller 4 informs the identification unit 1A whether or not there is a frequency and a modulation method that have already been bridged, so that it is not interrupted again in some cases.
[0011]
Here, since it is not already bridged, it is determined in step S4 whether the software defined radios 3A to 3N have a vacancy. This determination is made based on whether there is a software defined radio that has not received anything in the order of the smallest number from the software defined radio 3A. Here, it is assumed that the software defined radio 3B corresponds. In subsequent steps S5 and S6, if the software defined radio 3B does not support the radio wave B that is currently desired to be received from the controller 4, the corresponding software is downloaded. This is instructed by the controller 4, and software operating in the frequency band and modulation method corresponding to the incoming radio wave B is downloaded to the software defined radio 3B.
[0012]
In the next step S7, the controller 4 determines whether there is group ID data in the communication, and in step S8, determines whether there is the same group ID in the software defined radio 3A that has already been received. When this occurs, in step S9, the controller 4 switches the connection of the relays 5 so as to be in the same group. In other words, since the software defined radio 3A and the software defined radio 3B are in the same group and the software defined radio 3A communicates with the same group ID, the controller 4 controls the relay 5 so that the output of the software defined radio 3A is the software. The output of the software defined radio 3B is connected to the input of the radio set 3B, and the output of the software defined radio 3A is connected to the input of the software defined radio 3A, whereby different communications of the same group are bridged as shown in FIG.
[0013]
Thereafter, in step S10, the occupation flags of the software defined radios 3A and 3B used for the bridge are turned on, and the controller 4 determines the software defined radios 3A and 3B used for the bridge, the frequency, the modulation method, A bridged data file describing the group ID is created and used in steps S3, S4 and S6. When the group ID is different in step S7, the connection by the relay 5 is not performed. The identification by the group ID is for knowing whether the radio wave needs to be bridged.
[0014]
If no information flows to the LINE after a certain time, the controller 4 is interrupted by the relay 5 and returns the LINE number. A group without communication is determined from the LINE number, the relay 5 is switched so as to release the determined group, and the occupation flag of the software defined radio is turned off.
[0015]
In this way, if you use a software radio as a radio and have the same group ID, it is determined that people want to communicate with each other, so that two software radios bridge the communication between different radio systems, The communication content of the radio wave A can be received by the radio wave B, and the communication content of the radio wave B can be received by the radio wave A. In addition, by performing the above-described bridge, it is possible to communicate with terminal devices of different modulation schemes at different frequencies. When a new communication method comes out, it becomes possible to communicate with the latest terminal device even with the old communication method terminal device, and in the event of a disaster, the Self-Defense Forces, the fire department, the police, and the local government use terminal devices of a different method. In addition to using a software defined radio, communication is possible by replacing the software.
[0016]
Assuming that three software defined radio units that can be modulated and demodulated by software constitute one unit, when radio waves C are received by the same group, the controller 4 controls the relay 5 as shown in FIG. The machine 3C is connected to the software defined radios 3A and 3B in the same manner as described above. The received data is transmitted by the radio wave C from the software defined radio 3C.
[0017]
In such a communication apparatus between different wireless systems, even when there are a plurality of groups, communication within the same group becomes possible by increasing the number of software defined radios. The limit of the number of groups that can be handled depends on the number of types of radio waves that are different from software radios. This is because if there are many radio waves in one group, the number of software defined radio devices required for one group increases.
[0018]
In order to perform such an operation, the minimum number of identification units required for radio wave interception is one. One identification unit can intercept all wireless systems. It is also possible to increase the number of identification units for reliable interception and for countermeasures when the system goes down. In addition, since a software radio can be used to bridge communication between different radio schemes, a wide range of radio schemes can be supported, so that at least two software radio units are sufficient. In other words, when two different types of radios are used within the same group for communication belonging to one group, only one identification unit and one set of software radios need to be bridged. It will be.
[0019]
By using a software defined radio whose software can be exchanged by changing software, it is possible to bridge without knowing each other's radio system and using a plurality of radio systems freely in the same group. In addition, if the number of software defined radios is increased by increasing the number of groups to bridge at a time, it is possible to cope by increasing the number of software defined radios. Functional enhancement is easy with software upgrades.
[0020]
【The invention's effect】
According to the communication apparatus between different radio systems described above, since software radios are used, the number of radio systems that can be bridged is large, and the same number of radios as the types of radio systems to be bridged should be prepared. Thus, communication is possible without requiring a large number of receivers and transmitters and having a plurality of wireless systems in the same communication group without prior arrangement of the wireless systems. Even when wireless systems cannot be unified when a wireless network is constructed, it is possible to construct a network by arranging the above-described communication devices between different wireless systems as bridge stations.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a communication device between different radio systems according to an embodiment of the present invention.
2 is an enlarged view of a main part of a communication device between different radio systems shown in FIG. 1;
FIG. 3 is an enlarged view of another main part of the communication device between different radio systems shown in FIG. 1;
4 is a flowchart showing the operation of the communication apparatus between different radio systems shown in FIG. 1. FIG.

Claims (1)

In a communication device between different radio systems that have a plurality of software defined radios and communicate between software radios in the same communication group using different radio systems,
An identification unit that receives radio waves of different radio systems having a group ID indicating the group, and identifies a frequency band and a modulation system as the radio system;
The group ID and the radio system which are the outputs of the identification unit are taken in, and the software corresponding to the frequency band and the modulation system as the radio system is distributed to one software defined radio, and the frequency band as the other radio system and If there is a software defined radio to which the software corresponding to the modulation method is distributed and has the same ID as the group ID, a bridge for a call between the software defined radio and the one software defined radio is performed. Controller
A communication device between different wireless systems.

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