JP2010219930A - Radio communication terminal and method of switching radio communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication terminal that can collectively change the communication method for all the radio terminals in a system. <P>SOLUTION: A radio communication system includes a plurality of radio terminals that are software radio terminals, a base station, and a control station connected to the radio terminals via the base station. In the radio communication system, a storage region number is common among all the radio terminals and the same software is stored in storage regions of the same storage region number. The radio terminal 11-N, as one of the radio terminals, includes a storage device section 24 for storing software for each radio communication method in a different storage region; and a radio signal processing section 23 that receives an instruction for switching a radio communication method that includes a storage region number corresponding to software for a radio communication method wherein switching to two or more terminals out of the radio terminals to which the control station sends data is instructed, and loads the software stored in the storage region number contained in the instruction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a wireless communication comprising a software defined radio terminal adapted to various wireless communication methods by rewriting installed software, a base station wirelessly connected to the software defined wireless terminal, and a control station connected to the base station. The present invention relates to a wireless communication terminal and a wireless communication system switching method in a system.

  Software radio supports various radio systems by rewriting the installed software. In the conventional software defined radio technology, for example, as described in Patent Document 1 below, a radio corresponding to software defined radio (software defined radio) is installed with software corresponding to various radio schemes in its own memory, or Hold by downloading. Then, the software defined radio always monitors the communication quality of communication using the current wireless system and detects the deterioration of the communication quality. When the software defined radio detects a deterioration in communication quality, the software defined radio notifies an integrated device that controls a plurality of communication methods in an integrated manner. Then, the integrated device transmits position information, which is information regarding the environment of the base station corresponding to the software defined radio that has notified the deterioration, to the software defined radio. The software defined radio selects a new wireless communication method suitable for the environment based on the received position information, and switches to the selected communication method.

JP 2003-101474 A

  However, according to the above conventional technique, switching is realized by selecting an optimum wireless communication method based on the individual wireless communication quality of each software defined radio. For this reason, there has been a problem that it is not possible to collectively change the communication method of all the wireless terminals constituting the system when the communication method is upgraded or changed to a new wireless method in the entire system.

  The present invention has been made in view of the above, and it is an object of the present invention to obtain a wireless communication terminal and a wireless communication system switching method capable of collectively changing the communication system of all the wireless terminals constituting the system. To do.

  In order to solve the above-described problems and achieve the object, the present invention holds software corresponding to each wireless communication method, and changes the wireless communication method used in transmission / reception processing by loading the held software. The wireless communication terminal in a wireless communication system, comprising: a plurality of wireless terminals; a base station wirelessly connected to the wireless terminal; and a control station connected to the base station and connected to the wireless communication terminal via the base station The storage area number for identifying the storage area is common to all wireless communication terminals, and the same software is stored in the storage area having the same storage area number. Storage means for storing software corresponding to a communication method in different storage areas, and two of the wireless communication terminals transmitted by the control station Signal processing for receiving a wireless communication system switching instruction including a storage area number corresponding to software of a wireless communication system instructing switching to an upper terminal and loading software stored in the storage area number included in the instruction And means.

  According to the present invention, the control station designates a storage area for a plurality of wireless terminals constituting the same wireless communication system, transmits a wireless communication system switching instruction, and the wireless terminal that has received the switching instruction Since the software stored in the stored storage area is loaded and the corresponding wireless communication system is operated, the communication system of a plurality of wireless terminals constituting the system can be changed at once. There is an effect.

FIG. 1 is a diagram showing a configuration example of a first embodiment of a wireless communication system according to the present invention. FIG. 2 is a diagram illustrating a functional configuration example of the wireless terminal. FIG. 3 is a diagram illustrating an example of a procedure for software download and radio system switching. FIG. 4 is a flowchart showing an example of the download operation of the control station. FIG. 5 is a flowchart illustrating an example of the download operation of the wireless terminal. FIG. 6 is a flowchart illustrating an example of a switching operation of the wireless communication scheme of the control station. FIG. 7 is a flowchart illustrating an example of a wireless terminal switching operation of the wireless terminal. FIG. 8 is a chart showing an example of a procedure for performing simultaneous download.

  Embodiments of a wireless communication terminal and a wireless communication system switching method according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a diagram showing a configuration example of a first embodiment of a wireless communication system according to the present invention. As shown in FIG. 1, the wireless communication system of the present embodiment includes terminal transmission / reception antennas 10-1 to 10-N (N is an integer of 2 or more) for transmitting and receiving radio waves, and terminal transmission / reception antennas 10-1 to 10-1. 10-N is connected to the terminal transmission / reception antennas 10-1 to 10-N in a one-to-one relationship. The transmission signals are demodulated, and the transmission signals are modulated and output to the terminal transmission / reception antennas 10-1 to 10-N. Wireless terminals 11-1 to 11-N, a base station transmission / reception antenna 12 that transmits and receives radio waves, a base station transmission / reception antenna 12, and a base station transmission / reception antenna 12 that demodulates a reception signal and transmits a transmission signal. A base station 13 that modulates and outputs to the base station transmitting / receiving antenna 12, and a control station 14 that is wired to the base station 13 and controls the wireless terminals 11-1 to 11 -N via the base station 13. .

  Here, the wireless terminal 11-i is connected to the terminal transmission / reception antenna 10-i, and the wireless terminal 11-i does not include the terminal transmission / reception antenna 10-i. It is good also as a structure provided with antenna 10-i. Similarly, the base station 13 may include the base station transmitting / receiving antenna 12.

  FIG. 2 is a diagram illustrating a functional configuration example of the wireless terminal 11-N. In the figure, the wireless terminal 11-N is taken as an example, but the wireless terminals 11-1 to 11-N have the same configuration. The radio terminal 11 -N includes an RF (Radio Frequency) front end unit 21, an AD (Analog Digital) / DA (Digital Analog) conversion unit 22, a radio signal processing unit 23, and a storage device unit 24.

  The RF front end unit 21 includes a band pass filter, a low noise amplifier, a down converter, and an up converter, and amplifies the received signal from the terminal transmitting / receiving antenna 10-N during reception, and the band pass filter filters the amplified signal. The filtered signal is down-converted and sent to the AD / DA converter 22. At the time of transmission, the transmission signal input from the AD / DA conversion unit 22 is up-converted, the band-pass filter filters the transmission signal after the up-conversion, and the filtered transmission signal is amplified and transmitted to the antenna 10-N. To do.

  The AD / DA converter 22 includes an analog / digital converter (A / D) and a digital / analog converter (D / A), and at the time of reception, the signal inputted from the RF front end unit 21 is converted from analog to digital to receive digital. The signal is sent to the wireless signal processing unit 23 as a signal. At the time of transmission, the signal input from the wireless signal processing unit 23 is converted from digital to analog and sent to the RF front end unit 21.

  The wireless signal processing unit 23 is configured by a reconfigurable device such as an FPGA (Field Programmable Gate Array) or a processor such as a DSP (Digital Signal Processor), and the processing content can be changed based on software read from the storage device unit 24. . At the time of reception, the received digital signal input from the AD / DA converter 22 is down-converted to the baseband frequency and demodulated, and the demodulated data is transmitted. At the time of transmission, the transmission data is modulated and then up-converted and sent to the AD / DA converter 22 as a transmission signal.

  As described above, the wireless signal processing unit 23 reads software from the storage device unit 24 and realizes wireless signal processing defined by the read software. When necessary, the radio signal processing unit 23 downloads software from the control station 14 via the base station 13 and stores the downloaded software in the storage unit 24.

  The storage device unit 24 is a storage unit for storing software to be supplied to the wireless signal processing unit 23. The storage device unit 24 includes storage areas 25-1 and 25-2 for each wireless system in order to hold software corresponding to each of the plurality of wireless systems. 2 illustrates two areas of the storage areas 25-1 and 25-2. However, the number of storage areas is not limited to this, and may be determined according to the number of assumed wireless systems. Good.

  Next, software download and communication method switching operations of the wireless terminals 11-1 to 11-N according to the present embodiment will be described. FIG. 3 is a diagram illustrating an example of a procedure for software download and radio system switching. Here, a case will be described in which the number of wireless terminals to be controlled by the control station 14 is two (wireless terminals 11-1 and 11-2).

  When the control station 14 downloads software corresponding to the wireless communication method to each wireless terminal in order to switch to a new wireless communication method, the control station 14 first instructs the wireless terminal 11-1 to download the software via the base station 13. A software download instruction is transmitted (step S1). Upon receiving the software download instruction, the wireless terminal 11-1 transmits a software download request to the control station 14 via the base station 13 based on the instruction (step S2). In the following, communication between the wireless terminals 11-1 to 11-N and the control station 14 is performed via the base station 13 in both directions, but the expression “via the base station 13” is omitted.

  Upon receiving the software download request from the wireless terminal 11-1, the control station 14 transmits software download data corresponding to the wireless communication method after switching to the wireless terminal 11-1 (step S3). At this time, the control station 14 instructs the wireless terminal 11-1 the number of the storage area of the storage device that stores the software together with the download data. The wireless terminal 11-1 stores the transmitted download data in the storage area designated by the control station 14 (in this case, the storage area 25-2, for example), and notifies that the download was successful. Download completion information is transmitted to the control station 14 (step S4).

  When the control station 14 receives the normal download completion information, the control station 14 completes the process of downloading the software to the wireless terminal 11-1, and then performs a step between the wireless terminal 11-2 and the wireless terminal 11-1. The same processing as that performed in S1 to Step S4 is performed in Step S5 to Step S8, and software is downloaded to the wireless terminal 11-2.

  When the software download to the wireless terminals 11-1 and 11-2 is completed, the control station 14 transmits a wireless communication method switching instruction to the wireless terminals 11-1 and 11-2 (step S9). When the wireless terminals 11-1 and 11-2 receive the wireless communication system switching instruction and perform the switching operation, the wireless terminals 11-1 and 11-2 transmit wireless communication system switching completion information to the control station 14 (step S10). Here, the wireless terminals 11-1 and 11-2 are set as the switching targets of the wireless communication method. However, when all the wireless terminals are set as the switching targets, the same processes as those in Steps S1 to S4 are performed for all the wireless terminals. This is performed for the terminals, and after all the wireless terminals have completed downloading the software, the control station 14 instructs the wireless terminals to switch the wireless communication method at once. When receiving the switching completion information, the control station 14 completes the wireless communication system switching process.

  Next, the software download operation of the control station 14 and the wireless terminals 11-1 to 11-N will be described in detail. FIG. 4 is a flowchart showing an example of the download operation of the control station 14. FIG. 5 is a flowchart illustrating an example of the download operation of the wireless terminals 11-1 to 11-N.

  The control station 14 determines whether or not to issue a software download instruction (step S11), and when it is determined that a software download instruction is to be issued (Yes in step S11), the wireless terminal 11-i (i = 1) that is a download target. To N), a software download instruction is transmitted (step S12). At this time, it is determined that a download instruction is issued, for example, when software is updated or when switching to a new communication method is required. If it is determined that the software download instruction is not to be performed (No in step S11), the process is terminated as it is.

  After transmitting the software download instruction in step S12, it is determined whether or not a software download request has been received from the wireless terminal 11-i (step S13). If no software download request has been received (No in step S13), It is determined whether the number of times the software download instruction has been transmitted is within a predetermined set number of retransmissions (step S16). If it is determined that the set number of retransmissions has been exceeded (No in step S16), the process ends. If it is determined that the number is within the set number of retransmissions (Yes in step S16), the process returns to step S12.

  If it is determined in step S13 that a software download request has been received (step S13 Yes), software download data is transmitted to the wireless terminal 11-i (step S14). Then, the control station 14 determines whether or not the normal download completion information from the wireless terminal 11-i has been received (step S15). If it is determined that it has not been received (No in step S15), the software download instruction It is determined whether or not the number of transmissions is within the set number of retransmissions (step S16). If it is determined that the set number of retransmissions has been exceeded (No in step S16), the process is terminated. If it is determined that the number is within the set number of retransmissions (step S16 Yes), the process returns to step S12.

  If it is determined in step S15 that the normal download completion information has been received from the wireless terminal 11-i (Yes in step S15), the process ends. The above processing is performed for all the wireless terminals 11-1 to 11-N that are the switching targets of the wireless communication system.

  Next, the download operation of the wireless terminal 11-i will be described. The subsequent download operation of the wireless terminal 11-i is performed by the wireless signal processing unit 23 of the wireless terminal 11-i. The wireless terminal 11-i determines whether or not a software download instruction has been received from the control station 14 (step S21). If it is determined that it has been received (step S21 Yes), it transmits a software download request to the control station 14. (Step S22). If it is determined that a software download instruction has not been received (No at step S21), the process ends.

  After transmitting the software download request, the wireless terminal 11-i downloads the software (download data) transmitted from the control station 14, and the storage area 25 corresponding to the storage area number instructed simultaneously from the control station 14 The software is stored in -j (j = 1, 2) (step S23). Then, the wireless terminal 11-i determines whether or not the download is successful (step S24), and if it is determined that the download is not successful (No in step S24), the process ends. On the other hand, if it is determined that the download was successful (Yes in step S24), normal download completion information is transmitted to the control station 14 (step S25), and the download operation is completed.

  Next, the switching operation of the wireless communication system between the control station 14 and the wireless terminal 11-i will be described. FIG. 6 is a flowchart illustrating an example of the switching operation of the wireless communication scheme of the control station 14. FIG. 7 is a flowchart illustrating an example of a wireless communication method switching operation of the wireless terminal 11-i.

  First, the control station 14 determines whether or not to instruct the wireless terminals 11-1 to 11-N to switch the wireless communication method (step S31), and when determining to perform the switching instruction (Yes in step S31). Then, a wireless communication system switching instruction is transmitted to the wireless terminals 11-1 to 11-N (step S32). At this time, the wireless communication system switching instruction includes a number for identifying a storage area in which software corresponding to the communication system after switching is stored. If it is determined that the wireless communication method is not switched (No in step S31), the processing is terminated as it is.

  When the control station 14 transmits the wireless communication system switching instruction to the wireless terminals 11-1 to 11-N, the wireless communication system switching normal end information from all the wireless terminals 11-1 to 11-N that transmitted the switching instruction. Is determined (step S33). When it is determined that there are wireless terminals 11-1 to 11-N that have not received the wireless communication system switching normal end information (No in step S33), it is determined whether the number of transmissions of the switching instruction is within a predetermined set number of retransmissions. (Step S34). If it is determined that the set number of retransmissions has been exceeded (No in step S34), the process ends. If it is determined that the number is within the set number of retransmissions (Yes in step S34), the process returns to step S32. If it is determined in step S33 that the normal termination information has been received from all the wireless terminals 11-1 to 11-N that have transmitted the switching instruction (Yes in step S33), the wireless communication system switching process is completed.

  On the other hand, the wireless terminal 11-i determines whether or not a wireless communication method switching instruction has been received from the control station 14 (step S41), and if it has determined that a switching instruction has not been received (No in step S41). The process is terminated as it is. If it is determined that a wireless communication system switching instruction has been received (step S41 Yes), the software is loaded by reading out the software from the storage area designated by the control station 14 (step S42), and the wireless signal with the loaded new software is read. The modulation / demodulation process is started (step S43). Then, the system change completion information is transmitted to the control station 14 (step S44), and the wireless communication system switching process is completed. Here, the method change completion information is transmitted as the normal end information of the wireless communication method.

  In the above description, the case where software is individually downloaded for each wireless terminal has been described. However, the software may be downloaded to all wireless terminals simultaneously. FIG. 8 is a chart showing an example of a procedure for performing simultaneous download. FIG. 8 shows an example in which the number of wireless terminals is two. The control station 14 transmits a software download instruction for instructing software download to the wireless terminals 11-1 and 11-2 (step S51). At this time, the control station 14 instructs the wireless terminals 11-1 and 11-2 of the storage area number of the storage device that stores the software together with the download data. When receiving the software download instruction, the wireless terminals 11-1 and 11-2 respectively transmit a software download request to the control station 14 based on the instruction (step S52). Receiving the download request, the control station 14 transmits the download data to the wireless terminals 11-1 and 11-2 together with an instruction for a storage area for storing the download data (step S53). Each of the wireless terminals 11-1 and 11-2 stores the transmitted download data in the storage area instructed by the control station 14, and sends normal download completion information for notifying that the download has been successful, to the control station 14. (Step S54). Subsequent steps S55 and S56 are the same as steps S9 and S10, respectively.

  The example of FIG. 8 is different from the individual download shown in FIG. 3 in that a software download instruction from the control station 14 is simultaneously transmitted to a plurality of wireless terminals by broadcast or the like, and the download is performed simultaneously. In addition, a software download instruction may be transmitted to all wireless terminals by broadcasting, or when simultaneous download to a plurality of specific wireless terminals is performed, download may be realized using multicast. Similarly, an instruction for a wireless communication method may be transmitted by broadcast or multicast.

  Further, here, a case has been described in which switching of wireless communication methods is performed for all wireless terminals at the same time, but a wireless method switching instruction may be individually given for each wireless terminal. Moreover, you may make it switch a radio | wireless communication system simultaneously with respect to a specific some radio | wireless terminal.

  In the present embodiment, the wireless terminal 11-i downloads the software corresponding to the wireless communication method to be switched from the control station 14 before the wireless communication method is switched. A switching instruction may be issued for the software held by the terminal 11-i. For example, when software is stored in advance in a specific storage area 25-j of the storage device unit 24, or when software is stored in the base station using another medium or the like, the storage area corresponding to the software is stored. The wireless terminal 11-i may load the stored software by transmitting a wireless communication system switching instruction for designating a number. At this time, each wireless terminal stores the same software in the storage area with the same number.

  Further, in the present embodiment, the case where there is one base station 13 has been described as an example. However, the same operation of the present embodiment can be applied even when there are a plurality of base stations connected to the control station 14. it can. In that case, a software download instruction or a wireless communication system switching instruction may be transmitted to all of the wireless terminals connected to a plurality of base stations, or a software download instruction or a wireless communication system may be transmitted to some wireless terminals. A switching instruction may be transmitted. Also, when switching the wireless communication method for each base station to which the wireless terminal is connected, a software download instruction or a wireless communication method switching instruction is transmitted to the wireless terminal connected to the specific base station. Also good.

  In the present embodiment, the control station 14 transmits an instruction to switch the wireless communication method of the wireless terminal so as to switch the wireless communication method. However, when the software is downloaded, the control station 14 The date and time designation information for designating the date and time of switching may be transmitted together, and the wireless terminal may switch the communication method by loading the software at the date and time designated based on the date and time designation information and the internal timer. Good.

  As described above, in the present embodiment, the control station 14 designates a storage area for each wireless communication method for a plurality of wireless terminals constituting the same wireless communication system, and instructs the wireless terminal to download software. Stores the software corresponding to the designated storage area, and the control station 14 designates the storage area, transmits a wireless communication system switching instruction to a plurality of wireless terminals, and receives the switching instruction. Loads the software stored in the specified storage area and performs the operation by the corresponding wireless communication method. Therefore, it is possible to collectively change communication methods of a plurality of wireless terminals constituting the same wireless communication system. In addition, when switching between services and wireless systems using the same frequency, it is possible to perform simultaneous switching of all wireless terminals.

  As described above, a wireless communication terminal and a wireless communication method switching method according to the present invention include a wireless communication system including a software wireless terminal, a base station that is wirelessly connected to the software wireless terminal, and a control station that is connected to the base station. In particular, it is suitable for a wireless communication system including a plurality of software defined wireless terminals.

10-1 to 10-N terminal transmission / reception antenna 11-1 to 11-N wireless terminal 12 base station transmission / reception antenna 13 base station 14 control station 21 RF front end unit 22 AD / DA conversion unit 23 wireless signal processing unit 24 storage device unit

Claims (16)

Software corresponding to each wireless communication method is held, a plurality of wireless terminals that change a wireless communication method used in transmission / reception processing by loading the held software, a base station that is wirelessly connected to the wireless terminal, and A wireless communication terminal in a wireless communication system comprising a control station connected to a base station and connected to the wireless communication terminal via the base station,
The storage area number that identifies the storage area is common to all wireless communication terminals, and the same software is stored in the storage area of the same storage area number,
Storage means for storing software corresponding to each wireless communication method in different storage areas for each wireless communication method;
A wireless communication system switching instruction including a storage area number corresponding to software of a wireless communication system that instructs switching to two or more of the wireless communication terminals transmitted by the control station is included in the instruction Signal processing means for loading software stored in the storage area number;
A wireless communication terminal comprising:   The radio communication terminal according to claim 1, wherein the radio communication terminal receives the radio communication scheme switching instruction transmitted from the control station to all radio communication terminals to be controlled by the control station.   The wireless communication terminal according to claim 2, wherein the wireless communication system switching instruction transmitted by broadcast from the control station to all of the wireless communication terminals is received.   2. The wireless communication terminal according to claim 1, wherein the wireless communication terminal receives the wireless communication method switching instruction transmitted from the control station to some wireless communication terminals to be controlled by the control station.   5. The wireless communication terminal according to claim 4, wherein the wireless communication method switching instruction transmitted by multicast from the control station to the some wireless communication terminals is received. When the software stored in the storage area number included in the received wireless communication method switching instruction is loaded, a switching normal completion notification is sent to the control station to notify that the switching is normally completed,
6. The wireless communication according to claim 1, wherein the control station retransmits the wireless communication method switching instruction when the control station cannot receive the switching normal completion notification within a predetermined time. Terminal.   The wireless communication terminal according to claim 6, wherein the control station stops retransmission of the switching normal completion notification when the number of retransmissions of the switching normal completion notification exceeds a predetermined threshold. The control station transmits the switching destination software, which is software corresponding to the wireless communication method of the switching destination, and the storage area number of the corresponding storage destination as download data,
When the download data is received, the switching destination software included in the download data is stored in the storage area number included in the received download data,
The said control station transmits the said radio | wireless communication system switch instruction | indication to the radio | wireless communication terminal which transmitted the said download data, after transmitting the said download data, The Claim 1 characterized by the above-mentioned. Wireless communication terminal. The control station transmits a download instruction to instruct the download of the switching destination software to two or more wireless communication terminals,
When the download instruction is received, a download request that is a response to the download instruction is transmitted to the control station,
When the control station receives the download request, the control station transmits the download data to the wireless communication terminal of the transmission source,
When the download data is received, after storing the switching destination software, a normal download completion notification for notifying that the download data has been normally received is transmitted to the control station,
As a process of transmitting a wireless communication method switching instruction after the download of the download data, the control station receives the normal download completion notification and then transmits the wireless communication method switching instruction to the wireless communication terminal that has transmitted the normal download completion notification. The wireless communication terminal according to claim 8, wherein the wireless communication terminal is transmitted.   The radio communication terminal according to claim 9, wherein the control station retransmits the download instruction when the download request cannot be received within a predetermined time.   The radio communication terminal according to claim 10, wherein the control station stops retransmission of the download instruction when the number of retransmissions of the download instruction exceeds a predetermined threshold. The control station, the wireless communication system switching instruction, the execution time that is the time to execute the instruction, the storage area number of the storage destination corresponding to the switching destination software that is software corresponding to the switching destination wireless communication system, , Will be sent as download data,
When the download data is received, the switching destination software is stored in the storage area number included in the received download data, and stored in the storage area number included in the wireless communication system switching instruction at the execution time. Software is loaded, The radio | wireless communication terminal as described in any one of Claims 1-5 characterized by the above-mentioned. When the download data is received, after storing the switching destination software, a normal download completion notification notifying that the download data has been normally received is transmitted to the control station,
After the control station receives the normal download completion notification, the control station transmits the wireless communication method switching instruction to the wireless communication terminal that is the transmission source of the normal download completion notification, which is the wireless communication terminal that transmitted the download data. The wireless communication terminal according to claim 8, wherein:   The wireless communication terminal according to claim 9, 10 or 11, wherein the control station retransmits the download data when the normal download completion notification cannot be received within a predetermined time.   The control station stops retransmission of the download data when the number of retransmissions between the switching destination software and the storage area number of the corresponding storage destination exceeds a predetermined threshold value. 14. A wireless communication terminal according to 14. A plurality of wireless communication terminals that hold software corresponding to each wireless communication system, change a wireless communication system used in transmission / reception processing by loading the held software, and a base station that is wirelessly connected to the wireless communication terminal; A wireless communication method switching method in a wireless communication system comprising: a control station connected to the base station and connected to the wireless communication terminal via the base station,
When the wireless communication terminal stores a storage area number for identifying a storage area in common among all wireless communication terminals, and stores the same software in the storage area of the same storage area number,
The wireless communication terminal stores, for each wireless communication method, software corresponding to the wireless communication method in different storage areas;
A switching instruction transmission step in which the control station transmits a wireless communication system switching instruction including a storage area number corresponding to software of a wireless communication system instructing switching to two or more terminals among the wireless communication terminals;
A communication method switching step in which the wireless communication terminal that has received the wireless communication method switching instruction loads the software stored in the storage area number included in the instruction;
A wireless communication system switching method comprising:

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