JP2001320773A - Device and method for software downloading in subscriber radio system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently perform software downloading to a slave station without operation by an operator. SOLUTION: Using monitoring means 17 and 18 to monitor operating condition of a speech channel between a base station and the slave station at any time, and downloading means 16, 19, 20, 21 and 22 to download software from the base station to the slave station in prescribed order at the time of few using of the speech channel monitored by the using monitoring means are provided in a software downloading device in a subscriber radio system in which a radio channel is set by multi channel access between the base station 15 and a plurality of slave stations 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber radio system. In particular, the present invention relates to a software download apparatus and method in a subscriber wireless system.

[0002]

2. Description of the Related Art There is a communication system in which a low-cost subscriber wireless system is installed instead of a wired telephone in a place where a conventional wired line is not provided. JP-A-8-23572
No., published in Japanese Unexamined Patent Publication No.

FIG. 7 is a block diagram showing a schematic configuration of a software download device in a subscriber radio system which is a premise of the present invention. As shown in the figure, a subscriber wireless system 200 is connected to an existing switching system 100. In the exchange system 100, a telephone 4 on the network side is connected to the exchange 1 through a subscriber line 5. Telephone 4
To the exchange 1 are the existing exchange system 100, and the system connected to the end is the subscriber wireless system 200.

In the subscriber radio system 200, a subscriber radio system base station 2 is connected to the exchange 1 of the exchange system 100 via subscriber lines 6-1 to 6-q. The antenna 7 of the subscriber wireless system base station 2 is
The mobile stations are connected to the antennas 9-1 to 9-p of the slave stations 3-1 to 3-p through the wireless line 8 by a multi-channel access method.

[0005] Each of the slave stations 3-1 to 3-p passes through the subscriber lines 10-1 to 10-r and passes through the slave stations 3-1 to 3-p.
The telephones 11-1 to 11-r under each of p are connected. A monitoring terminal 12 is connected to the subscriber wireless system base station 2, and the monitoring terminal 12 has a download database 13, which stores download data (A) and (B).

[0006] From the subscriber radio system base station 2 to the slave station 3
The operation of software download to -1 to 3-p
Data stored in the download database 13 from the monitoring terminal 12 is operated by the operator to operate the slave stations 3-1 to 3-
p.

[0007]

However, in the software download to the slave station in the subscriber wireless system, since the operator recognizes the call state and performs the software download work when the call volume is reduced,
There has been a problem that software download work is concentrated at midnight when the traffic decreases.

[0008] For this reason, if the number of software download operations accompanying the software version upgrade increases, the burden on the operator becomes large and it is not efficient. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a software download apparatus and method in a subscriber wireless system that enables software download to a slave station efficiently without an operator operation. I do.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides software download in a subscriber radio system in which a radio line is set up by multi-channel access between a base station and a plurality of slave stations. The apparatus, wherein the base station monitors usage status of a communication channel with the slave station as needed, and when the usage of the communication channel monitored by the usage monitoring means is small, the base station transmits the slave station to the slave station. And a download means for downloading software in a predetermined order.

[0010] By this means, the software download work does not concentrate at midnight or the like, and even if the software download work accompanying the software upgrade increases, the slave station can be efficiently operated without the operation of the operator. Software can be downloaded to. Preferably, a TS management table is provided in the use monitoring means, and the TS management table holds a time slot number, a slave station number, and used / unused information, and manages the usage status of the plurality of slave stations. .

[0011] By this means, the basis for calculating the remaining number of used communication channels is formed. Preferably, a TS status detection unit is provided in the use monitoring unit, and the TS status detection unit refers to the TS management table and sets a remaining value of the unused communication channel in the plurality of slave stations to a predetermined value. In the following cases, the download is started by the download means.

According to this means, when the remaining value of the communication channel becomes, for example, 5% or less, software for each child station type is sequentially downloaded to the child stations in a downloadable state, so that the download becomes efficient. . Preferably, the download unit provides a download channel separately from the call channel,
Download processing is performed in parallel with the call processing.

By this means, the download is realized by using a channel different from that of the call processing, so that the normal call processing service is enabled for the slave stations other than the one during the download. Preferably, the download means is provided with a latest download file database, and the latest download file database holds the latest software and checksum which is desired to be downloaded for each slave station type.

By this means, the latest software required for the slave station is maintained. Preferably, the checksum is compared with a checksum calculated for software uploaded from the slave station to the base station for confirmation after downloading from the base station to the slave station, and comparing the comparison result. The result is stored in the download unit as a download result of the slave station.

[0015] By this means, the slave station whose download has failed due to the comparison result of the checksum is again subjected to the download. Preferably, the download unit is provided with a slave station status monitoring unit, and the slave station status monitoring unit monitors a power supply OFF and a radio burst OFF of the slave station, and sets a monitoring result as a status of the slave station, and sets the monitoring result as the download unit To hold.

[0016] By this means, the download is performed excluding the child station in the OFF state. Preferably, the download means is provided with a download result table, and the download result table holds a slave station type, a download result, a slave station status, and a priority of download for each slave station number. Referring to the download result table, the order of download to the slave station is determined.

By this means, the operator can monitor the version upgrade status of each slave station. Preferably, monitoring terminal means is further provided, and the monitoring terminal means sets the predetermined value for the remaining numerical value of the communication channel.
By this means, it becomes possible for the operator to set a predetermined value of the remaining numerical value.

Preferably, monitoring terminal means is further provided, and the monitoring terminal means sets download priority in the download result table. By this means, it becomes possible for the operator to set the priority of download in the slave station. Preferably, monitoring terminal means is further provided, and the monitoring terminal means updates the latest software and checksum of the latest downloaded file database.

This means makes it possible for the operator to update the latest software. Preferably, monitoring terminal means is further provided, and the monitoring terminal means makes a download status request to the download result table. By this means, it becomes possible for the operator to monitor the version upgrade status of each slave station.

Further, the present invention relates to a software download method in a subscriber radio system in which a radio line is set up by multi-channel access between a base station and a plurality of sub-stations, wherein the base station is connected to the sub-station. Monitoring the use status of the communication channel as needed, and downloading software in a predetermined order from the base station to the slave station when the usage of the communication channel monitored by the use monitoring unit is small. A software download method in a subscriber wireless system is provided.

By this means, similarly to the above-mentioned invention, the software download work does not concentrate at midnight or the like, and even if the software download work accompanying the software version upgrade increases, there is no need for an operator's operation. This has made it possible to efficiently download software to slave stations.

[0022]

In the present invention, the base station 15 for the subscriber radio system and the sub-station 28 are replaced with the base station 2 for the subscriber radio system and the slave stations 3-k (k = 1 to p) shown in FIG. -K
(K = 1 to p) are provided, and a wireless channel is set between them by a multi-channel access method.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a subscriber wireless system base station 15 according to the present invention.
An antenna 27 is provided in the subscriber wireless system base station 15, and the antenna 27 performs transmission and reception with the slave stations 28-k (k = 1 to p).

A radio circuit 24 is connected to the antenna 27. The radio circuit 24 controls call processing and transmission / reception processing of download packets. The control unit 23 is connected to the wireless circuit unit 24, and the control unit 23 performs overall control including the wireless circuit unit 24. The control unit 23 includes the call control management unit 16
Is connected, and the call control manager 16 manages procedures for performing call control such as call setting, calling, and disconnection.

A slave station status monitoring unit 20 is connected to the control unit 23. The slave station status monitoring unit 20 controls the slave stations 28-k (k = 1 to p) based on a signal received from the control unit 23. Power off,
It constantly monitors whether or not the wireless burst appears to be OFF. A TS (time slot) management table 18 is connected to the control unit 23, and the TS management table 18 manages a TS number and a slave station number between the base station and the slave station in a field of use status.

A TS status detector 17 is connected to the TS management table 18, and the TS status detector 17 refers to the TS status detector 17 to determine the start of download.
Monitor at all times. The control unit 23 downloads the latest
The file database 21 is connected, and the latest download file database 21 has the latest download file data necessary for performing software download to the slave station.

A download / upload control unit 19 is connected to the control unit 23. The download / upload control unit 19 determines a slave station to execute download, and thereafter determines a slave station type, and determines a corresponding latest download / download.
The downloaded file of the file database 21 is transferred from the subscriber wireless system base station 15 to the slave station 28-k (k
= 1 to p), and controls transmission.

A download result table 22 is connected to the control unit 23. The download result table 22 is used for confirming the downloaded data twice.
Since 8-k (k = 1 to p) is uploaded to the subscriber wireless system base station 15, the subscriber wireless system base station 15 performs a checksum calculation again on this data, and performs the latest download / download. A control is performed in which the value is compared with the target checksum value of the file database 21 and the result is input to the download result field.

It should be noted that the download result table 22
When the OFF state is monitored by the slave station state monitoring unit 20, the value of the state field is set to OFF. The control unit 23 has the monitoring terminal 2 via the monitoring terminal interface unit 25.
6 is connected, the monitoring terminal interface unit 25 is connected to the monitoring terminal 26 and the latest download file database 2.
1. It operates as an interface with the download result table 22.

Therefore, the monitoring terminal 26 transmits the latest download file database 21 and the download result table 22 via the monitoring terminal interface unit 25.
Will be accessible. That is, the monitoring terminal 26
Since the download results of the slave stations 28-k (k = 1 to p) have been updated in the download result table 22, the download results can be confirmed by the operator's operation. It becomes possible to monitor the version upgrade information of each slave station in comparison with the latest data.

FIG. 2 is a view for explaining TS data managed in the TS management table 18 of the subscriber wireless system base station 15. As shown in the figure, the radio frame 14 between the subscriber radio system base station 15 and the slave stations 28-k (k = 1 to p) has Cch: control c for executing control.
channel, Vch1-N: voice channels, which are communication channels used for communication, the subscriber wireless system base station 15, and the slave stations 28-k (k = 1 to
DLL to execute software download between p)
ch: consists of a software download channel.

As for the communication channel, the base station 15 for the subscriber's radio system and the slave station 2 for concentrating from the exchange.
It is assumed that the number of TSs for 8-k (k = 1 to p) is smaller than the subscriber line 5 of the exchange 1 and the base station 15 for the subscriber wireless system. Subscriber wireless system base station 15 and slave station 28-
The usage status of the TS for k (k = 1 to p) is different from time to time. The radio frame 14 indicates that call processing and download processing can be performed in parallel because Vch1 to Vch, which are communication channels used for call processing services, and DLLch used for download are different.

FIG. 3 is a diagram for explaining the data contents managed inside the subscriber radio system base station 15. As shown in FIG. 6A, the latest download file database 21 manages the slave station type, download file, and checksum fields.

With regard to this data, it is necessary for the operator to register the latest software to be downloaded for each type from the monitoring terminal 26 to the latest download file database 21 of the base station 15 for the subscriber wireless system. However, as an operator, once registered, there is no need to perform a download operation on the slave stations 28-k (k = 1 to p).
Performs the download process based on the internal management data.

As shown in FIG. 3B, in the TS management table 18, the TS numbers and the slave stations 28-k (k = 1
~ P) Number and field of use are managed. With regard to this data, the operator
Whether the remaining numerical value of the communication channel set from the above becomes equal to or less than a predetermined value (for example: 5%) or not.
When monitoring at any time at 7, the use / unuse of the TS is the basis for calculating the remaining number of use.

As shown in FIG. 3C, in the download result table 22, the slave stations 28-k (k = 1 to
p), the slave station type, the download result, the status, and the priority field. Regarding this data, when the subscriber wireless system base station 15 starts downloading, the priority field is first referred to, and the slave station 28-k (k
= 1 to p).

If the priority field is marked with "*", the slave station 28-k marked with "*"
(K = 1 to p) is given priority from the smallest number, and if no mark is attached to the priority field, the search is performed sequentially from the smallest number. After the numbers of the slave stations 28-k (k = 1 to p) to be executed are determined, the target slave stations 28-k (k = 1 to p) are next determined.
In the case of OFF (state indicating wireless burst OFF or power OFF of the slave station 28-k (k = 1 to p)), the slave station 28- having the next highest priority is referred to. The search is repeated for k (k = 1 to p).

ALM: In the case of the slave station 28-k (k = 1 to p) where the download has failed previously, the download may be successful by re-executing the slave station 28-k. With regard to the download result field, once the number of the slave station 28-k (k = 1 to p) to download is determined, the subscriber station 28-k (k = 1 to k) is transmitted from the subscriber wireless system base station 15.
Software download is performed in p).

Thereafter, in order to double check that the slave station 28-k (k = 1 to p) has successfully received the data, the slave station 28-k (k = 1 to p) transmits the subscriber radio signal. The software is uploaded to the system base station 15. The checksum of the uploaded data is recalculated inside the base station 15 for the subscriber wireless system, and the target slave station 28-
It is compared with the checksum value of k (k = 1 to p), and if it matches, the download result is marked with “○”, and if incorrect, the mark is marked with “x”.

FIG. 4 shows a slave station 28-k (k = 1) according to the present invention.
FIG. 2 is a block diagram illustrating a schematic configuration of the present invention. Slave station 28-
An antenna 34 is provided at k (k = 1 to p), and the antenna 34 performs transmission and reception with the subscriber wireless system base station 15. The wireless circuit section 31 is connected to the antenna 34, and the wireless circuit section 31 controls call processing and transmission / reception processing of download packets.

A control unit 32 is connected to the radio circuit unit 31, and the control unit 32 performs overall control including the radio circuit unit 31. The download / upload control unit 29 is connected to the control unit 32, and the download / upload control unit 2
9 first, the start of download is notified from the subscriber wireless system base station 15, so that the slave stations 28-k
(K = 1 to p) If the inside is in a download startable state, a response is returned with OK, new call processing (outgoing / incoming) is prohibited, and the received download data is received.

A ROM (Read Only Memory) 33 is connected to the download / upload control unit 29, and the ROM 33 executes writing of the download data received by the download / upload control unit 29. After the download is completed, the content written in the ROM 33 is set again in the transmission packet, and the slave station 28-k is set.
(K = 1 to p) is transmitted to the subscriber wireless system base station 15 as upload data.

Thereafter, the base station 15 for the subscriber radio system
When the reset of the slave station 28-k (k = 1 to p) is executed from the slave station 28-k (k = 1 to p), the slave station 2 is reset by the new software written in the ROM 33.
8-k (k = 1 to p) is activated. FIG. 5 is a diagram showing a slave station software download / upload sequence between the subscriber wireless system base station 15 and the slave stations 28-k (k = 1 to p).

By using the sequence shown in the figure, the control unit 23 of the subscriber wireless system base station 15 and the slave stations 28-k (k =
It is confirmed whether or not the remaining communication channel numerical value registered by the operator's operation for explaining a series of operations with the control unit 32 of 1 to p) is equal to or less than a predetermined value (eg, 5%). If not, the download is not performed.

If the number is less than the predetermined value, the slave station 2 has no problem even if the traffic is reduced and the download is executed.
It is determined that 8-k (k = 1 to p) exists, and the software download starts. Next, the slave station 28-k (k = 1 to p) to execute the download is selected with reference to the priority and status fields of the download result table 22.

A download start command is transmitted from the subscriber wireless system base station 15 to the selected slave station 28-k (k = 1 to p). When the slave station 28-k (k = 1 to p) receives the download start command, the slave station 28-k (k = 1 to p) sends a download start response (O
K) is returned, and the internal state of the child station 28-k (k = 1 to p) becomes a call processing suspended state.

In the subscriber wireless system base station 15, a download start response (O) is sent from the slave station 28-k (k = 1 to p).
When K) is received, the download file of the target slave station type is extracted from the latest download file database 21. After the extracted download file is set in a transmission packet, it is transmitted as a download data transmission command from the subscriber wireless system base station 15 to the child stations 28-k (k = 1 to p).

When the slave station 28-k (k = 1 to p) receives the download data transmission command, it sends a download data transmission response (O
K) is returned, and the received data is stored in the ROM 33. Thereafter, the internal state of the slave station 28-k (k = 1 to p) becomes the upload start state.

The data written in the ROM 33 is set in a transmission packet, and then transmitted from the slave station 28-k (k = 1 to p) to the subscriber wireless system base station 15 as an upload data transmission command. When the subscriber wireless system base station 15 receives the upload data transmission command, an upload data transmission response (OK) is transmitted to the slave stations 28-k (k = 1 to p), and the received data is transmitted to the subscriber wireless system. The checksum is recalculated inside the base station 15 and the result is compared with the checksum of the target slave station type in the latest download file database 21.

In the same case, a slave station restart command is transmitted from the subscriber radio system base station 15 to the slave stations 28-k (k = 1 to p). Slave station 28-k (k =
After reset, the 1-p) side is activated with the new software contents and enters the call processing state. Here, since the download processing of one slave station 28-k (k = 1 to p) has been completed, the processing returns to the initial processing.

When the comparison result of the checksum is NG, ALM is entered in the download result field of the download result table 22, and the process returns to the first processing.
However, in the case of NG, "do" or "do not" for the download retry process can be applied by the system. FIG. 6 is a diagram showing an operation sequence of the subscriber wireless system base station 15 and the monitoring terminal 26.

A series of operations of the control unit 23 of the base station 15 for the subscriber radio system will be described with reference to FIG. From the monitoring terminal 26 to the subscriber wireless system base station 15
There are four operations that operate on. The first is that the monitoring terminal 26 sends the base station 15 for the subscriber wireless system.
Download start value to the phone (call channel remaining value)
When receiving a download start predetermined value command from the monitoring terminal 26, the base station 15 for the subscriber's wireless system registers the predetermined value internally and starts monitoring the cycle of the communication channel.

A response (OK) is returned to the monitoring terminal 26. The second is registration of a download priority slave station from the monitoring terminal 26 to the subscriber wireless system base station 15;
Upon receiving the download priority slave station registration command from the monitoring terminal 26, the subscriber wireless system base station 15 causes the “*” mark to be entered in the priority field of the download result table 22.

A response (OK) is returned to the monitoring terminal 26. The third is registration of a download file from the monitoring terminal 26 to the subscriber wireless system base station 15. When the subscriber wireless system base station 15 receives the download file registration command from the monitoring terminal 26, the latest download is performed. -Update the file database 21.

After the update, the download result is cleared for the slave stations 28-k (k = 1 to p) having the same slave station type in the download result table 22. Monitoring terminal 26
Is sent a response (OK). Fourth, monitoring terminal 2
6 is a request for a download status request to the subscriber wireless system base station 15. When the subscriber wireless system base station 15 receives the download status request command from the monitoring terminal 26, it returns the contents of the download result table 22. Set to packet.

A response (OK) is returned to the monitoring terminal 26. Therefore, in the present invention, by setting a predetermined value of the remaining value of the communication channel used for determining the start of download from the monitoring terminal 26, the TS status detection unit 17
, The TS status is monitored, and when the TS value becomes equal to or less than the predetermined value, the slave station 28-k in a state where downloading is possible.
(K = 1 to p), software data for each slave station type can be downloaded sequentially, and the download is performed by using a channel different from the call processing to realize the download. Slave stations other than
For k (k = 1 to p), a normal call processing service is enabled.

[0057]

As described above, according to the present invention,
Since the base station monitors the use status of the communication channel and performs the download to the slave station, the work of the operator is reduced. The reason for monitoring the usage status of the communication channel is that if there is a small amount of traffic, there should be a slave station where call processing has not occurred, so it is efficient to download sequentially from such slave stations. Because there is. If only when a call is not completely generated, the predetermined value of the remaining use number of the communication channel may be set to 0%.

Next, simultaneous download is generally performed at midnight when the traffic is small. However, since the base station monitors the use status of the communication channel and downloads to the slave station, the download is particularly performed during the time period. This is effective when the traffic volume is small, regardless of the traffic volume, and is therefore efficient. Next, since a download channel is provided in the wireless frame, call processing operations can be performed on the stations other than the slave station being downloaded, so that call processing and download can be executed in parallel.

Next, when the operator wants to know the status of the download, if the monitoring terminal sends an inquiry command to the base station, the download status can be recognized, and the operator can be notified of abnormalities such as download failure. .

[Brief description of the drawings]

FIG. 1 is a subscriber wireless system base station 15 according to the present invention.
FIG. 2 is a block diagram showing a schematic configuration of the embodiment.

FIG. 2 is an explanatory diagram of TS data managed by a TS management table 18 of a subscriber wireless system base station 15.

FIG. 3 is a diagram illustrating data contents managed inside a subscriber wireless system base station 15;

FIG. 4 is a block diagram showing a schematic configuration of a slave station 28-k (k = 1 to p) according to the present invention.

FIG. 5 shows a subscriber wireless system base station 15 and slave stations 28-.
k (k = 1 to p) slave station software download /
FIG. 7 is a diagram illustrating an upload sequence.

FIG. 6 shows a subscriber wireless system base station 15 and a monitoring terminal 2
6 is a diagram showing an operation sequence of No. 6. FIG.

FIG. 7 is a block diagram illustrating a schematic configuration of a software download device in a subscriber wireless system which is a premise of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Exchange 4 ... Telephone 5, 6-1 to 6-q ... Subscriber line 14 ... Radio frame 15 ... Base station 16, 30 ... Call control management unit 17 ... TS status detection unit 18 ... TS management table 19, 29 ... Download / upload control unit 20 slave station status monitoring unit 21 latest download file database 22 download result table 23, 32 control unit 24, 31 wireless circuit unit 25 monitoring terminal interface unit 26 monitoring terminal 27, 34 ... Antenna 28-k (k = 1 to q) ... Slave station 33 ... ROM 100 ... Exchange system 200 ... Subscriber wireless system

Continued on the front page F-term (reference)

Claims (13)

[Claims] 1. A software download apparatus in a subscriber wireless system in which a wireless channel is set up by a multi-channel access between a base station and a plurality of slave stations, wherein the base station uses a communication channel with the slave station. Use monitoring means for monitoring the situation as needed; and download means for downloading software from the base station to the slave station in a predetermined order when the use of the communication channel monitored by the use monitoring means is small. A software download device in a subscriber wireless system. 2. The use monitoring means is provided with a TS management table. The TS management table holds a time slot number, a slave station number, and used / unused information, and uses the plurality of slave stations for use. The software download apparatus according to claim 1, wherein the software download apparatus manages the software download. 3. The use status monitoring means is provided with a TS status detection unit, and the TS status detection unit refers to the TS management table to determine a remaining numerical value of the unused communication channel in the plurality of slave stations. 3. The software download apparatus according to claim 2, wherein the download unit starts the download when the value is equal to or less than a predetermined value. 4. The subscriber radio according to claim 1, wherein said download means performs a download process in parallel with a call process by providing a download channel separately from said call channel. Software download device in the system. 5. The download means is provided with a latest download file database, and the latest download file database holds the latest software and checksum desired to be downloaded for each slave station type. A software download device in a subscriber wireless system according to claim 1, wherein 6. The checksum is compared with a checksum calculated for software uploaded from the slave station to the base station for verification after downloading from the base station to the slave station, and 6. The software download apparatus according to claim 5, wherein a result is stored in the download unit as a download result of the slave station. 7. The slave unit status monitoring unit is provided in the download unit, and the slave station state monitoring unit monitors power OFF and wireless burst OFF of the slave station, and sets a monitoring result as a slave station status. The software download device in the subscriber wireless system according to claim 1, wherein the software download device is held in download means. 8. The download means is provided with a download result table, and the download result table holds a slave station type, a download result, a slave station status, and a priority of download for each slave station number. 2. The software download apparatus according to claim 1, wherein the means determines the order of download to the slave station by referring to the download result table. 9. The software according to claim 3, further comprising monitoring terminal means, wherein the monitoring terminal means sets the predetermined value with respect to the remaining value of the communication channel. Download device. 10. The apparatus according to claim 8, further comprising monitoring terminal means, wherein said monitoring terminal means sets a download priority in said download result table.
Software download device in a subscriber wireless system according to item 1. 11. The subscriber wireless system according to claim 5, further comprising monitoring terminal means, wherein said monitoring terminal means updates the latest software and checksum of said latest download file database. Software download device. 12. The software download apparatus according to claim 8, further comprising monitoring terminal means, wherein said monitoring terminal means makes a download status request to said download result table. 13. A software download method in a subscriber wireless system in which a wireless channel is set up by a multi-channel access between a base station and a plurality of slave stations, wherein the base station uses a communication channel with the slave station. Monitoring the situation as needed, and downloading software in a predetermined order from the base station to the slave station when the use of the communication channel monitored by the use monitoring unit is small. Software download method for a subscriber wireless system.