JP2003051796A - Downloading system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduces the time and cost for updating a program to a plurality of devices. SOLUTION: A mobile terminal 2 is connected to a device 1 controlled by a program. A server 4 distributing program update data is connected to a base station 3 via a mobile communication network 5 and the base station 3 distributes the update data to the mobile terminal 2 by broadcasting. Thus, the base station 3 can distribute update data at once independently of the number of operating devices and installed places.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a download system for distributing updater to devices controlled by a program.

[0002]

2. Description of the Related Art In recent years, microcomputers have been incorporated in various devices such as personal computers, copiers, and fax machines, as well as vending machines, car navigation systems, mobile phones, and various home appliances. The operation of these devices is controlled by a program.

In a device such as a personal computer in which a general user can rewrite the program, the maker gives the customer a customer when the program has a defect or the program is modified to improve the function. In addition to announcing the existence of the updater (repair program) as necessary, the updater is distributed in the form of a medium such as a CD-ROM, or the updater is distributed via a communication line such as the Internet. It is possible to upgrade the program version with will.

On the other hand, in devices other than personal computers, it is generally impossible for a user to rewrite the program, and an engineer of the device development maker or the program development maker performs an operation to replace the updater or update as a recall. The current situation is to replace the existing program with an equivalent product. When replacing the data with the updater, the user himself / herself brings in the equipment to the designated service base, or the technician dispatched from the manufacturer of the equipment visits the customers one by one to update the equipment one by one. The current situation is to incorporate the.

[0005]

However, in the above-mentioned method, the updater is incorporated into the update target devices one by one, so that hundreds of thousands to millions of target devices are operating. In this case, the time and cost required to complete the work of incorporating the updater with respect to the total number of target devices become enormous.

In consideration of such circumstances, the program of the target device is updated using the communication line, and the effect of reducing the dispatch cost of the engineer is obtained. However, since the updater is transmitted to each of the target devices by one-to-one communication, the program can be updated in a relatively short time when the number of target devices is small, but the device can be updated. It becomes difficult to update in a short time if the number of vehicles increases. For example, assuming that there are 1 million target devices that update one line of a server that distributes the updater, and if it takes 5 minutes to distribute the updater, it will take about 10 years. . Therefore, even if 500 lines can be secured for the updater distribution, it will take about 7 days. As described above, the conventional method still requires a large amount of time and cost to update the program, and is not sufficient as a method of delivering the updater to a device having a large number of operating devices.

The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to deliver updater from a server to a plurality of operating devices at one time, thereby reducing the time and cost required for updating a program. It is to provide a download system that can be significantly reduced.

[0008]

According to a first aspect of the present invention, there is provided a base station of a mobile communication network, a mobile terminal capable of data transmission between the base station, a device controlled by a program, and the program. Updater is registered and the server transmits the updater to a device through a base station, and the device has a rewritable storage means for storing a program,
Control means for controlling the operation of the device by the program stored in the storage means and writing means for writing the program transmitted from the server through the mobile terminal in the storage means are provided, and the updater is transmitted from the server. At this time, identification data including at least device type data that specifies the type of device that is the transmission target of the program and program identification data that represents the version of the program is sent to the mobile terminal together with the updater by broadcast from the base station. When the transmitted and written means matches the transmitted device type data with the device type data set in the writing means in advance, and the program identification data confirms that it is an unrewritten updater. The updater is stored in the storage means and is used for mobile communication. Since simultaneously distributed to a plurality of devices by broadcast the update by using the technology, it is possible to server delivers the updater at a time in a number base of the device may be only one line. As a result, one to one
Compared with the case of delivering the updater by communication or delivering the updater by preparing a large number of lines, the time required for the delivery of the updater can be significantly shortened and compared with the case of preparing a large number of lines on the server side. It is possible to significantly reduce the equipment cost. Further, the writing means judges whether or not the program should be updated based on the device type data and the program identification data received together with the updater, and writes the updater to the storage means only when the update is necessary. Even if the message is transmitted, the updater is transferred only to the target device, and the program is prevented from being inadvertently rewritten.

According to a second aspect of the present invention, in the first aspect of the present invention, the updater received by the mobile terminal is divided into a plurality of blocks, and block identification data for identifying each block and error check are performed. Data is added, and the writing means specifies block identification data for a block in which an error is detected by the error check data, and requests the server to resend it. The updater is divided into a plurality of blocks and transmitted. Therefore, even if the correct updater cannot be transmitted due to a change in the transmission condition of the radio wave between the base station and the mobile terminal, it is sufficient to request retransmission only for the block in which the error is detected. Significantly reduces mobile network traffic compared to retransmitting the entire network Door can be. This is particularly effective when the number of devices to be updated is large.

According to a third aspect of the present invention, in the first aspect of the present invention, the updater received by the mobile terminal is divided into a plurality of blocks, and block identification data for identifying each block and error check are performed. Data and the block in which the error is detected by the error check data in the writing means,
After the reception of the updater, the block identification data is designated to request the server to retransmit, and since the updater is divided into a plurality of blocks and transmitted, the transmission status of the radio wave between the base station and the mobile terminal. Even if the correct updater could not be transmitted due to a change in the packet, it is only necessary to request retransmission for the block in which the error was detected, and the traffic of the mobile communication network can be reduced compared to the case where the entire updater is retransmitted. It can be significantly reduced. This is particularly effective when the number of devices to be updated is large. Moreover, since the block for which the error is detected is requested to be retransmitted after the end of the reception of the updater, the block retransmission request is not generated during the transmission of the updater, and the data transmission direction between the base station and the mobile terminal is changed. It is simplified and transmission control becomes easy.

According to a fourth aspect of the invention, in the invention of the second or third aspect, the server repeatedly transmits the same updater a plurality of times when transmitting the updater,
The writing unit complements the block in which an error is detected at the first reception of the updater at the second and subsequent reception of the updater, and when there is an uncompleted block at the time when the transmission of the updater from the server ends. This is a request for the server to retransmit the block, and the probability that an error will occur in the same block while the updater is transmitted multiple times is small. Therefore, the same updater is transmitted from the server multiple times and an error occurs when receiving the first update. By supplementing the generated block at the time of the second and subsequent reception, the number of blocks for which retransmission is requested is reduced, and as a result, it contributes to the reduction of the traffic of the mobile communication network.

According to a fifth aspect of the present invention, in the first to fourth aspects of the invention, when the writing means succeeds in rewriting the updater, the device is uniquely identified within a predetermined time after the rewriting is completed. Identification data is returned to the server, and when the unique identification data is returned, the server updates the version management table that associates the version of the program with the device. By checking the contents of the version management table, Since it is possible to check the devices that have not been updated, it is possible to individually respond to devices that were not in an updateable state such as power being cut off when the updater was distributed, and for all devices The program can be updated without fail.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the device is provided with a timer for randomly setting the predetermined time for each device from the completion of rewriting the updater to returning the unique identification data. However, when the unique identification data is intensively transmitted from the mobile terminal to the base station, the traffic of the mobile communication network increases,
Since a timer is provided that randomly sets the time from the completion of update of the updater to the return of unique identification data for each device, the transmission of the unique identification data will not be Concentration can be suppressed.

According to a seventh aspect of the invention, in the first to sixth aspects of the invention, when the mobile terminal receives the updater by the simultaneous broadcast from the base station, the transmission of the updater from the server ends. Up to the above base station, the mobile terminal does not transmit until the reception of the updater is completed, so the mobile terminal such as a mobile phone transmits and receives in packet units as is normally done. The power consumption required for transmission at the mobile terminal can be significantly reduced as compared with the case where the above is repeated. In other words, even if there are many devices, the total amount of electric power required to update the program is relatively small.

According to an eighth aspect of the present invention, in the first to seventh aspects of the invention, the server is provided with clock means for designating a time when the updater is transmitted, and the device is used at night. It is possible to deliver the updater by designating a time so that the possibility is low and the traffic of the mobile communication network is low.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION In the present embodiment, a copying machine is illustrated as an example of a device, but the invention is not limited to the copying machine, and the technical idea of the present invention is applicable to any device controlled by a program. is there.

As shown in FIG. 2, a copying machine (device) 1a
It is assumed that there are a plurality of types of .about.1c, and the programs controlling the operations are different for each of the copying machines 1a to 1c. As shown in FIG. 2, the mobile terminal 2 is connected to the device 1 which is the copy machine 1a to 1c. The mobile terminal 2 wirelessly transmits data to the base station 3 of the mobile communication network 5, and the base station 3 is connected to the server 4 via the mobile communication network 5. The mobile communication network 5 includes copy machines 1a to 1c.
Maker side terminals 6a to 6c provided in the manufacturer of
If there is updater to be transmitted to the copy machines 1a to 1c in the manufacturer terminals 6a to 6c, it can be transferred to the server 4 through the mobile communication network 5. The illustrated example shows a state in which the programs 7a to 7c corresponding to the respective copying machines 1a to 1c are prepared in the respective manufacturers terminals 6a to 6c.

The device 1 which is the copying machine 1a-1c is shown in FIG.
As shown in, a communication interface 11 for connecting a mobile terminal 2 such as a mobile phone or a PHS phone is provided. Further, the device 1 is provided with a program storage unit 12 as a storage unit, and the control unit 10 including a microcomputer controls the operation of each unit of the device 1 according to a program stored in the program storage unit 12. The program storage unit 12 is composed of a rewritable memory such as a flash ROM that holds stored contents without power supply.
The storage of the program in 2 is performed by the writing means 13 connected to the mobile terminal 2 via the communication interface 11. The writing unit 13 includes a working memory including a RAM as a buffer for data exchanged with the mobile terminal 2 through the communication interface 11. Further, the device 1 is also provided with a device interface 14 for connecting to various parts such as a motor, a lamp, and a sensor.

Further, in the writing means 13, device type data representing the type of the device 1 and unique identification data for individually identifying each device 1 are set. The device type data is data corresponding to the model number of the device 1, and the unique identification data includes a manufacturing number of the device 1, a program version, and a time stamp indicating the date and time of the latest update of the program. On the other hand, the updater transmitted from the server 4 to the device 1 through the base station 3 and the mobile terminal 2 includes at least the device type data set in the device 1 and the program identification data representing the version of the program updated by the updater. The including identification data is added to the beginning of the updater. Further, communication parameters indicating transfer of the updater may be added to the updater in order to distinguish it from normal communication.

In the following, the operation will be described assuming that the program of the copying machine 1a needs to be upgraded. In this case, the manufacturer of the copying machine 1a transfers the update program 7a (updater) as one file to the server 4 through the manufacturer's terminal 6a in a prescribed format. It is also possible to specify the time to start the delivery of the updater from the maker terminal 6a, and when the time measured by the clock means 41 provided in the server 4 becomes the time specified by the maker terminal 6a,
Distribution of the updater is started through the base station 3.

By the way, when the base station 3 recognizes that the updater is delivered by the communication parameter added to the updater, it delivers the updater by broadcast (broadcast). Here, the base station 3 notifies the presence or absence of the updater as the notification information for notifying the transmission of the updater. Therefore, as shown in FIG. 3, all mobile terminals 2 existing within the reception range of the radio wave from the base station 3 receive the notification information (S1), and the writing means 13 analyzes the notification information. When the notification information indicates the transmission of the updater (S2), the communication parameter for making the mobile terminal 2 correspond to the reception of the updater is set in the mobile terminal 2 (S3). When the communication parameters are set in the mobile terminal 2 in this way, the updater can be received (downloaded) (S4). However,
Since the device type data and the program identification data, which are identification data, are added to the head of the updater as described above, the received device type data is written in the writing means 13.
Matches the device type data registered in advance,
The updater is read only when the version indicated by the program identification data is newer than the version of the program stored in the program storage unit 12. If the device type data do not match or the program version is not new, the updater reception is stopped and the standby state is entered.

By the way, the present embodiment adopts a structure in which the program is divided into a plurality of blocks and transmitted, and each block is provided with a block number as block identification data, and error check data is provided for each block. Is added. Further, the number of blocks forming the updater is notified before the start of the updater transmission. Therefore, when the reception of the updater is started, the notified number of blocks is set as a block counter (S5), and the block counter is decremented each time a block is received (S6) to determine whether or not the final block has been reached. (S7). Each block is stored in the working memory provided in the writing means 13. When the final block is reached, it is judged whether or not there is a transmission error in each block (S8). If there is no error, the writing means is written. All blocks from 13 are program memory 12
And the program stored in the program storage unit 12 is updated (S9). When the program update is completed, the server 4
A completion notice is sent to (S10).

On the other hand, when it is detected in step S8 that there is an error in any block, the server 4 is requested to retransmit only the block in which the error has occurred (S11). The block retransmitted in this way (S1
Regarding 2) as well, the presence or absence of an error is verified (S13), and if there is no error, the previously received block is complemented with the updater, and the program stored in the program storage unit 12 is updated (S14). A completion notification is made (S15).

Here, the time from the time when the program is rewritten successfully to the time when the completion notice is transmitted is randomly set for each device 1 by a timer (not shown) provided in the device 1, and the completion from each device 1 is completed. It reduces the possibility that notifications will be sent to one base station 3 simultaneously. As the completion notification, the unique identification data of the device 1 described above is returned to the server 4 in the form of a short mail. Therefore, as shown in FIG. 2, the mobile communication network 3 is provided with a mail system 8 for receiving short mail, and when the mail system 8 receives the unique identification data, the unique identification data is sent via the control device 9. Hand over to the server 4. Server 4
Is provided with a version management table. The version management table manages the version of the program set in each device 1 based on the unique identification data returned from each device 1. Further, based on the contents of the version management table, a list of the devices 1 for which the completion notice has been returned is automatically created, and the manufacturer side terminals 1 a to
If it is transferred as version management information to 1c, it can be used for management by the manufacturer. By thus creating the version management table, it is possible to confirm the device 1 for which the update has not been completed. Therefore, when the power is cut off due to a power failure during the updater distribution, the update cannot be performed. It is possible to individually deal with the devices 1 that have been installed.

The format of the above-mentioned updater and the format of each block are shown in Tables 1 and 2. Table 1
In, the "update target version" is the version of the program to be updated. This is because even if the device 1 with the same device type data is used and the program is specialized for the customer, it is inadvertently replaced by the program of another unspecialized device 1. It is added as information for prevention. That is, if the version of the program stored in the program storage unit 12 of the device 1 does not match the version specified as the "version target version", the update is not performed, and it is specialized for the customer. By setting a different version of the general program from the general program, the special program is prevented from being updated carelessly when the general program is updated. The “updater program version” corresponds to the program identification data. Further, the "file size" represents the size of the updater, and the "block number" means the number of blocks constituting the updater. Further, "update notification destination" represents the manufacturer side terminals 6a to 6c to which the version management information is transferred after the update is completed.

[0026]

[Table 1]

[0027]

[Table 2]

The formats of the completion notification and the resend request described above are as shown in Table 3 and Table 4, respectively. Since the completion notification is transmitted in the form of short mail, the completion notification message is described at the beginning, and the "device type data", "update target version",
The update notification includes the “program version of the updater”, which is the version of the program as the updater, and further includes the “serial number” and the “time stamp” that are the unique identification data. The format of the resend request is almost the same as that of the completion notification, but the message of the resend request of the block is described at the beginning, and "bit pattern of reception success / failure" is included in place of "time stamp".

The "reception success / failure bit pattern" is a bit pattern in which a block number is associated with a bit position and the success or failure of reception is represented by a bit value for each block. For example, if the updater is divided into 16 blocks, each bit position of 16-bit data is associated with a block number, and the bit value of the bit position corresponding to the successfully received block number is 1.
The bit value at the bit position corresponding to the block number for which reception has failed is set to 0. Now, assume that the most significant bit is associated with the block number 1 and the block number is 3
If the reception of the block of 10 and the block of block number 10 fails, the 16-bit data is "1101".
"111110111111", this is represented by four hexadecimal digits, and the data "DFBF" is transmitted as a "reception success / failure bit pattern".

[0030]

[Table 3]

[0031]

[Table 4]

In the above example, the updater is sent to the server 4
From the server 4 to the device 1 only once, but the server 4
It is desirable that the updater be transmitted from the device to the device 1 a plurality of times. When the same updater is transmitted multiple times, the mobile terminal 2 is prohibited from returning to the base station 4 until the transmission of all the updaters is completed, and the block in which the error occurred when the first updater was received. Even if there is, if the updater received after the second time can complement the block, the updater is complemented. When there is a block in which the error is not resolved even by the updater received multiple times, the retransmission is requested only for that block. In this way, if the same updater is received multiple times and the updater is complemented in block units, the number of blocks in which the error is not finally resolved is very small, and it is considered that the error is resolved in most of the devices 1. The possibility of requesting retransmission is greatly reduced, and an increase in traffic of mobile communication network 5 can be suppressed. Even when requesting retransmission of data, similarly to the completion notification, if the timing of the retransmission request is set at random by the timer, it is possible to suppress an increase in traffic of the mobile communication network 5 even for the retransmission request.

The above-mentioned updater transmission procedure is shown in FIG. In FIG. 4, a procedure of transmitting the same updater from the server 4 a plurality of times is adopted. As illustrated, the manufacturer terminals 6 (6a to 6c) transfer the updater to the server 4. The manufacturer's terminal 6 can specify the distribution start time and the number of times of distribution of the updater, and the server 4 distributes the updater to the device 1 by the simultaneous broadcast (broadcast) through the base station 3 at the specified distribution start time. In the illustrated example, the device 1 is 3
An example in which a table is provided is shown. Here, in order to distinguish from each device 1, they will be referred to as a device a, a device b, and a device c. For the devices a and b, it is assumed that the data has been successfully received and updated, and for the device c, a block having a block number of 5 (hereinafter, referred to as a block number.
It is assumed that a transmission error has occurred in (5). The devices a and b that have been successfully updated are notified of the completion at randomly set time intervals Ta and Tb, and the device c is notified at the randomly set time interval Tc of the block No.
5 is requested to be retransmitted. In the server 4, the block number from the device c. In response to the resend request of block No. 5 is retransmitted, whereby the update is completed in the device c. The update completion notification is transmitted to the mail system 8 in the form of a short mail, and the mail system 8 transfers the completion notification to the server 4. In this way, the server 4 can notify the maker side terminal 6 as an update completion list that lists the version management information of each of the devices a, b, and c.

In the above-described embodiment, since a copying machine is assumed as the device 1, the device 1 is supplied with power from the commercial power source, and the mobile terminal 2 is also supplied with power from the commercial power source through the device 1. On the other hand, the device 1 or the mobile terminal 2 may use a battery as a power source, and if the battery is exhausted during the update process and the battery capacity is insufficient, the update process may not be able to continue. On the other hand, since the device 1 or the mobile terminal 2 that uses a battery as a power source generally has a function of monitoring the remaining battery level, it is necessary to use this function and complete the update process before starting the reception of the updater. When the remaining battery power is lower than the assumed set reference value, the device 1 stops the update process. In this case, since the device 1 whose update has not been completed is registered in the version management table, each device 1 is individually handled as in the case where the power is cut off when the updater is delivered.

[0035]

According to the first aspect of the present invention, since the updater is simultaneously distributed to a plurality of devices by using the technology of mobile communication, a large number of devices are provided even if the server side has only one line. As a result, it is possible to deliver the updater at one time, and as a result, the time required for delivering the updater can be compared to the case where the updater is delivered by one-to-one communication or when the updater is delivered by preparing multiple lines. There is an advantage that the cost can be greatly shortened, and the facility cost can be significantly reduced as compared with the case where a large number of lines are prepared on the server side.

According to the invention of claim 2, in the invention of claim 1, since the updater is divided into a plurality of blocks and transmitted, the transmission condition of the radio wave between the base station and the mobile terminal may change. Even if the correct updater cannot be transmitted, it is only necessary to request retransmission for the block in which the error is detected, and the traffic of the mobile communication network can be significantly reduced compared to the case where the entire updater is retransmitted. There is an advantage.

According to a third aspect of the invention, in the first aspect of the invention, the updater is divided into a plurality of blocks and transmitted, so that there may be a change in the transmission condition of radio waves between the base station and the mobile terminal. Even if the correct updater cannot be transmitted, it is only necessary to request retransmission for the block in which the error is detected, and the traffic of the mobile communication network can be significantly reduced compared to the case where the entire updater is retransmitted. There is an advantage. Moreover, since the block for which the error is detected is requested to be retransmitted after the end of the reception of the updater, the block retransmission request is not generated during the transmission of the updater, and the data transmission direction between the base station and the mobile terminal is changed. There is an advantage that it is simplified and the transmission control is easy.

According to the invention of claim 4, in the invention of claim 2 or claim 3, since the probability that an error occurs in the same block while the updater is transmitted a plurality of times is small, the same updater is transmitted from the server a plurality of times. With
By supplementing the block in which the error occurred at the first reception at the second and subsequent receptions, the number of blocks requesting retransmission is reduced, resulting in the reduction of the traffic of the mobile communication network. There is an advantage of doing.

According to the invention of claim 5, in the inventions of claims 1 to 4, it is possible to confirm the device which has not been updated by looking at the contents of the version management table. There is an advantage that it is possible to deal individually with devices that were not in a state where updates were possible, such as when the device was blocked, and it is possible to reliably update the program for all devices.

According to the invention of claim 6, in the invention of claim 5, since a timer is provided for randomly setting the time from the completion of the update of the updater to the return of the unique identification data for each device, each device is unique. By shifting the timing of transmitting the identification data, there is an advantage that the concentration of transmission of the unique identification data can be suppressed.

According to the invention of claim 7, in the inventions of claims 1 to 6, since the mobile terminal does not transmit until the reception of the updater is completed, the packet is transmitted as usual in a mobile terminal such as a mobile phone. Compared with the case where transmission and reception are repeated in units, the power consumption required for transmission in the mobile terminal can be significantly reduced. In other words, even if there are many devices, the total amount of electric power required for updating the program is relatively small.

According to the invention of claim 8, in the invention of claims 1 to 7, since the server has a clock means for designating a time when the updater is transmitted, the device may be used at night. It is possible to deliver the updater by designating the time so that the time is low and the traffic of the mobile communication network is low.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of an embodiment of the present invention.

FIG. 2 is a block diagram showing an overall configuration of the above.

FIG. 3 is an operation explanatory diagram of the above.

FIG. 4 is an operation explanatory diagram of the above.

[Explanation of symbols]

1 equipment 1a-1c equipment 2 mobile terminals 3 base stations 4 servers 5 Mobile communication network 6a to 6c Manufacturer's terminal 7a-7c programs 8 mail system 9 Control device 10 Control means 11 Communication interface 12 Program storage unit (storage means) 13 Writing means 14 Equipment interface 41 Clock means

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Claims (8)

[Claims] 1. A base station of a mobile communication network, a mobile terminal capable of data transmission between the base station, a device controlled by a program, and updater of the program registered to the device through the base station. And a rewritable storage means for storing a program, a control means for controlling the operation of the equipment by the program stored in the storage means, and a transmission from the server through the mobile terminal. Writing means for writing the stored program in a storage means, and when transmitting the updater from the server, device type data designating the type of device to which the program is transmitted and program identification indicating the version of the program Identification data including at least data, the base station to the mobile terminal together with the updater It is transmitted by broadcast from the station, and in the writing means, the transmitted device type data matches the device type data set in advance in the writing means, and it is unupdated by the program identification data. A download system, wherein the updater is stored in the storage means when the update is confirmed. 2. The updater received by the mobile terminal is divided into a plurality of blocks, and block identification data for identifying the block and error check data are added to each block, and the writing means generates an error. 2. The download system according to claim 1, wherein block identification data is designated for a block in which an error is detected by the check data, and the server is requested to retransmit the block. 3. The updater received by the mobile terminal is divided into a plurality of blocks, block identification data for identifying blocks and error check data are added to each block, and an error occurs in the writing unit. 2. The download system according to claim 1, wherein, for a block in which an error is detected by the check data, block identification data is designated after the reception of the updater is requested, and the server is requested to retransmit. 4. The server repeatedly transmits the same updater a plurality of times at the time of transmitting the updater, and the writing unit detects a block in which an error is detected at the first reception of the updater at the second and subsequent reception of the updater. 4. The download system according to claim 2, wherein the server requests the server to resend the supplemented block when there is an uncomplemented block at the time when the transmission of the updater from the server is completed. 5. When the rewriting of the updater is successful, the writing means returns unique identification data for individually identifying the device to the server within a predetermined time after completion of the rewriting, and the server identifies the unique identification data. The version management table in which the version of the program is associated with the device is updated when returned, and the version management table is updated.
The download system according to claim 4. 6. The download system according to claim 5, further comprising a timer that randomly sets the predetermined time from the completion of rewriting of the updater to the return of the unique identification data for each device. . 7. The mobile terminal, when receiving the update data by simultaneous broadcast from the base station, prohibits transmission to the base station until transmission of the update data from the server is completed. The download system according to any one of claims 1 to 6. 8. The download system according to claim 1, wherein the server includes clock means for designating a time at which the updater is transmitted.