JP2003032264A - Wireless LAN system - Google Patents

Abstract

(57) [Summary] [Problem] To consolidate the number of slave stations managed by one master station as much as possible, and to cut off the power supply of a vacant master station, thereby saving power consumption. SOLUTION: Each of the master stations measures a data transfer amount for each fixed time transferred between the same master station and a corresponding slave station,
An occupancy measurement unit 1a for calculating the occupancy of the line, a memory 1b for storing the occupancy of the line, a LAN interface 1e, and a wireless modem 1g to which an antenna 1f is connected;
A power supply unit 1c for supplying power to the occupancy measurement unit 1a, the memory 1b, and the wireless modem 1g, and turning on or off the power in accordance with the input control signal; a power supply unit 1c and the occupancy measurement unit 1
a, a memory 1b, a LAN interface 1e, and a control unit 1h for controlling the wireless modem 1g, and an auxiliary power supply unit 1d for always supplying power to the LAN interface 1e and the control unit 1h.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless LAN system, and more particularly to the operation of the system,
The present invention relates to a wireless LAN system that saves power by turning on or off a plurality of master stations.

[0002]

2. Description of the Related Art Conventionally, a wireless LAN system has a configuration shown in FIG. 4 as an example. The wireless LAN system includes, for example, a master station 81 and a master station 82 installed in the same room.
Are connected by a LAN cable 86. Corresponding to the respective master stations, the master station 81 has four slave station numbers # 1 to # 4, and the master station 82 has two slave station numbers # 5 to # 6. Child stations 83 are managed by their respective parent stations. Master station 81, 8
Since the frequencies of the radio waves output by 2 are different, even if each master station is placed in the same room, they are placed in the area 84 where the radio waves of the line A reach or the area 85 where the radio waves of the line B reach. Each slave station 83 can wirelessly transmit data with the corresponding master station 81, 82.

Each parent station and each child station 83 wirelessly connect to a LAN.
Since it is connected to, the data of the slip input by the sales person outside the company using the notebook computer can be quickly connected to another slave station 83 in the company for processing after being brought back into the company. Therefore, the number of slave stations 83 connected to the master station is constantly changing. The master station is an L connecting with each master station.
The LAN interface 81a to which the AN cable 86 is connected, and the antenna 8 for transmitting / receiving radio signals to / from the slave station 83
1b, a wireless modem 81c for mutually converting a wireless signal and digital data, and a control unit 8 for controlling communication of each slave station.
1d and LAN interface 81
a, control unit 81d, wireless modem 81c, antenna 81b
Are connected in this order. On the other hand, the slave station 83 includes an antenna 83a for transmitting and receiving radio signals to and from the master station, a radio modem 83b for mutually converting radio signals and digital data, and a personal computer 83c connected to the radio modem 83b. . Each master station can manage the slave stations 83 up to a predetermined number, and within the range of this number, the slave station 83 will be the master station 81 or the master station 82 according to a predetermined procedure. Can be under either control of.

However, for example, when a sales person makes a business trip to a customer and the slave stations 83 of the slave station numbers # 5 to # 6 are logged out, the master station 82 that manages them has no management target. But it has to be up and running in preparation for new slave station logins that may occur. During that time, the power of the master station 82 remains on,
It has become a problem in recent years when energy saving is called for. On the contrary, when the slave stations 83 with the slave station numbers # 1 to # 2 managed by the master station 81 log out, the management capability (line occupancy rate) of the master station 81 corresponds to that of the master station 82. Even if it is possible to fully support the slave stations 83 with the slave station numbers # 5 to # 6, the two master stations are still operating,
Power was wasted.

[0005]

SUMMARY OF THE INVENTION The present invention solves the problems described above, and the number of slave stations managed by one master station is summarized as much as possible, and the power consumption of the vacant master station is cut off. It is an object of the present invention to provide a wireless LAN system that saves money.

[0006]

In order to solve the above problems, the present invention provides a plurality of master stations connected by a LAN (Local Area Network) and a range within which radio waves output by all the master stations reach. In a wireless LAN system comprising a plurality of slave stations which are arranged and perform wireless data transmission with one corresponding master station, each master station is connected to the slave station corresponding to the master station. An occupancy ratio measuring unit that measures the amount of data transferred between fixed intervals and calculates the occupancy ratio of the line, a memory that stores the occupancy ratio of the line, and a LAN
An interface, a wireless modem to which an antenna is connected, a power supply unit that supplies power to the occupancy ratio measurement unit, the memory, and the wireless modem, and turns on or off the power supply according to an input control signal; and the power supply unit. The controller includes an occupancy rate measuring unit, a memory, a control unit that controls the LAN interface, and the wireless modem, and an auxiliary power supply unit that constantly supplies power to the LAN interface and the control unit. Stores in the memory the occupancy rate of the line sent from the occupancy rate measuring section, the number of the slave stations corresponding to the master station, and the slave station number, and the predetermined specific master station is stored. When the occupancy rate of the line, the number of the slave stations corresponding to the master station, and slave station management data are acquired from other master stations via the LAN at regular intervals. At the same time, each of the slave stations is stored in the memory, and the specific master station determines the number of slave stations in the memory or the occupation rate of the line, and based on the result of the determination, the other master stations. The power supply control signal for controlling the power supply unit of the station is transmitted to the other master station via the LAN, and the control unit of the other master station that has received the same power supply control data, the content of the power supply control signal, The power of the power unit of the other master station is turned on or off.

[0007] Alternatively, a plurality of master stations connected by a LAN and a plurality of master stations arranged within the reach of radio waves output by all the master stations and performing wireless data transmission between the corresponding one master station. In the wireless LAN system including the slave stations, the amount of data transferred to each of the master stations at a constant time between the master station and the corresponding slave station is measured to determine the line occupancy rate. An occupancy rate measuring unit for calculating, a memory for storing the occupancy rate of the line, and power supply to each unit,
A power supply unit that turns on or off the power supply according to the input control signal, a power supply control unit that controls the power supply unit of the other master station, the occupancy ratio measurement unit, the memory, the power supply unit, and the power supply control unit. And a power supply control line for transmitting the control signal output from the power supply control unit of the predetermined specific master station to a power supply unit of another master station, the control unit The section stores the occupancy rate of the line sent from the occupancy rate measuring section, the number of the slave stations and the slave station numbers corresponding to the master station in the memory, and the specific master station is fixed. The occupancy rate of the line, the number of the slave stations corresponding to the master station, and slave station management data are acquired from the other master stations via the LAN and stored in the memory at each time, and the identification is performed. The master station of the number of slave stations in the memory Determining occupancy of the line, powering on or off of the power supply unit of the other of the master station as a result of the judgment.

Further, the specific master station searches for a combination of the master stations in which the sum of the line occupancy of each master station stored in the memory is equal to or less than a predetermined value, and responds to the combination. The management of the slave stations is reorganized into one of the master stations, and as a result of the reorganization, the power supply of the master station having no corresponding slave station is powered off.

Alternatively, the specific master station searches for a combination of the master stations in which the total number of slave stations of each master station stored in the memory is equal to or less than a predetermined value, and corresponds to the combination. The management of the slave stations is reorganized into one of the master stations, and as a result of the reorganization, the power supply of the master station having no corresponding slave station is powered off.

Further, the specific master station retrieves the occupancy rate of each of the master stations stored in the memory, and if the average value of the occupancy rate of the same station is equal to or more than a predetermined value, the current power supply is turned on. The power of the power supply unit of the other master station that has been disconnected is turned on, the management of the corresponding slave station is evenly distributed to the currently operating master station, and reorganization is performed.

Alternatively, the specific master station retrieves the number of the slave stations corresponding to the master station stored in the memory,
When the average value of the number of the slave stations is equal to or more than a predetermined value, the power of the other master station that is currently powered off is turned on and the management of the corresponding slave station is currently operating. Evenly distribute to parent stations and reorganize.

Further, the master station, when the corresponding slave station is logged on or logged out, sets the line occupation rate data, the number of slave stations corresponding to the master station, and the slave station management data to the specific master station. To the station via the LAN, and the specific master station which received the same is stored in the memory, and the other master station is stored in the memory according to the number of the slave stations corresponding to other master stations or the occupation rate of the line. The power supply of the master station is turned on or off.

Further, when the power supply of the master station is turned on and there is no corresponding slave station, the control section instructs the power supply section of its own to cut off.

Further, the control units of the other master stations other than the particular master station, when the corresponding last slave station logs out, give an instruction to disconnect to the power supply unit of its own.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A wireless LAN system according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of a wireless LAN system according to the present invention. The wireless LAN system includes, for example, the master station 1,
A master station 2 installed in the same room is connected by a LAN cable 3, and corresponding to each master station, the master station 1 has slave stations 11 to 14 with slave station numbers # 1 to # 4. Station 2
Then, the slave stations 15 to 16 having the slave station numbers # 5 to # 6 are managed by the respective master stations. Since the frequencies of the radio waves output from the master stations 1 and 2 are different, even if each master station is located in the same room, the radio range 4 of the radio wave of the line can be reached, or
Each slave station arranged in the radio wave range 5 to which the radio wave of the line reaches can wirelessly transmit data with the corresponding master stations 1 and 2.

Each master station measures the data transfer amount transferred between the same master station and the corresponding slave station at regular time intervals, and calculates an occupancy ratio of the line, and an occupancy ratio measuring unit 1a. 1b for storing the occupation rate of the LAN and the LAN interface 1
e, a wireless modem 1g to which the antenna 1f is connected, an occupancy ratio measuring unit 1a, a memory 1b, and a wireless modem 1g, and a power supply unit 1c that turns on or off the power supply according to an input control signal; Section 1c and occupancy rate measuring section 1a
The memory 1b, the LAN interface 1e, and the wireless modem 1g are controlled by a control unit 1h, and the LAN interface 1e and the control unit 1h are constantly supplied with an auxiliary power supply unit 1d. On the other hand, the slave station 11 has an antenna 11a for transmitting and receiving radio signals to and from the master station 1, and a radio modem 11b for mutually converting radio signals and digital data.
And a personal computer 11c connected to the wireless modem 11b.

The operation of the above arrangement will be described below. Each parent station will accept this child station number if there is a newly logged in child station, put it under its own control,
The slave station number and the number of slave stations currently managed are stored in the memory 1b. As described above, in the case of the master station 1, the slave station numbers # 1 to # 4 and the number of slave stations “4” are stored in the memory 1b. Further, when each master station transmits data to the slave station under its control, the control unit 1
h is the transmission amount data (the number of bytes) of the occupation rate measuring unit 1a
Send to. The occupancy rate measuring unit 1a accumulates and holds the transmission amount data. When a predetermined fixed time, for example, 10 minutes has elapsed, the occupancy rate measuring unit 1a calculates the occupancy rate of the line managed by the master station. If the accumulated transmission amount data is 150 megabytes and the theoretical maximum data transmission amount for 10 minutes on this line is 1000 megabytes, Therefore, this value is stored in the memory 1b. The other master stations 2 also perform the same processing, and the number of slave stations is “2”, the slave station numbers are # 5 to # 6, and the occupation rate is 20%, which is stored in the memory (not shown) of the master station 2. It By the way, the master station 1 is a predetermined specific master station, and has a function of collecting data of other master stations 2 and controlling a power supply unit 1c of the other master stations 2. For example, the control unit 1h of the master station 1 creates power control data for turning on or off the power of the master station 2,
It transmits to the master station 2 via LAN. The control unit 1h of the master station 2, which receives the power supply control data, turns on or off the power from the power supply unit 1c of the master station 2 according to the content of the power supply control data. On the other hand, when the master station 2 finishes calculating the line occupancy rate, it reads the memory contents of the master station 2 and the number of slave stations is "
2 ", the slave station number is # 5 to # 6, and the occupation rate is 20% is transmitted to the master station 1 via the LAN. The master station 1 which receives this data stores the data of the master station 2 in the memory 1b. The contents of the memory 1b are shown in FIG. 2 (A), which is stored together with the data of the master station 1.

Here, the control unit 1h of the master station 1 uses the memory 1
The combination of master stations whose sum of the occupation rate data of each master station stored in b is a predetermined value, for example, 80% or less is searched, and the management of the slave stations corresponding to the combination is reorganized into one master station. .
In other words, in a system that is currently operating with two master stations, if the master station 1 alone can handle this, the management of the slave stations is consolidated. Here, the predetermined value of the total occupancy rate data is set to 80% because when the value is more than this value, the transmission data of each slave station frequently collide with each other and the line efficiency sharply decreases. is there. First, when the occupancy rate data of each master station is summed up, the result is 60%, which does not reach 80% of the limit.
Implement reorganization of slave stations. In other words, the data that causes the master station 2 to abandon the management of the target slave station is transmitted via the LAN,
Upon receiving this, the master station 2 is the slave station 1 with the slave station numbers # 5 and # 6.
5 and the slave station 16 are instructed to log in to the master station 1 using the frequency used by the master station 1, and the slave station number is deleted from the memory 1b of the master station 2.
As a result, all the slave stations are aggregated in the master station 1 as shown in FIG. Therefore, since the target slave station does not exist in the master station 2, the control unit 1h of the master station 1 turns off the power of the power supply unit 1d to the control unit 1h of the master station 2 by using the power supply control signal described above. Give instructions to do so.

As described above, although two master stations were originally supposed to be operating, the operation of the master station 2 is temporarily stopped by concentrating the management of the slave stations on the master station 1. Then, it is possible to save power consumption by shifting to the standby mode, which is waiting for a power-on instruction by the power control signal from the master station 1. Further, in the above description, an example in which whether or not to reorganize the slave stations is determined based on the occupancy data has been described, but this may be the number of slave stations managed by each master station. For example, in FIG. 2A, it is assumed that the maximum number of managed units in one master station is 10, and the total number of currently managed units in each master station is 6 units, which is less than 10. Is. This method does not require the occupation rate measuring unit 1a, and the system can be constructed at low cost.

Next, a case will be described with reference to FIG. 2B where the data transmission amount of the slave station is increased when the system operation is completed after the aggregation of the slave stations to the master station 1 is completed. As described above, the master station 1 measures the line occupancy rate of the corresponding slave station at regular time intervals, and the control unit 1h always confirms the line occupancy rate, and the value of the occupancy rate data is a predetermined value, For example 80%
I'm checking if: If it exceeds 80%, it is determined that the master station 1 alone cannot manage the current slave station, and the control unit 1h sends a power supply control signal for turning on the power supply unit of the master station 2 to the master station 2. And sends an instruction to turn on the power supply of the power supply unit 2c of the master station 2. When the master station 2 operates again, the master station 1 reorganizes the slave stations to be managed and distributes them to the master station 2. That is, the current occupation rate of the master station 1 is 90%, and this is distributed to the master station 2. Currently, the number of child stations managed by the parent station 1 is 6, and these are the parent station 1 and the parent station 2
In order to disperse evenly, the half of the three units should be moved to the master station 2. Therefore, here, the slave stations with the slave station numbers # 4 to # 6 are instructed to log in to the master station 2 using the frequency of the master station 2, and the slave station numbers are deleted from the memory 1b. To do.

In this way, even if one master station 1 is operating, if the management capability of the master station 1 is exceeded, the master station 2 is restarted and the master station 2 manages the slave station. The system can be operated efficiently by distributing it. Further, in the above description, an example in which whether or not to reorganize the slave station is determined based on the occupancy data has been described, but this may be used as the number of slave stations under the control of the master station. For example, in FIG. 2B, the maximum number of managed units in one master station is set to 5, and the number of managed units of the master station 1, 6 units, is greater than 5, so this is a method of executing distribution. This method does not require the occupation rate measuring unit 1a, and the system can be constructed at low cost.

When the corresponding slave station logs on or logs out, the master station 2 sends the occupation rate data, the number of slave stations corresponding to the master station 2 and the slave station number data to the specific master station 1 by LA.
You may make it transmit via N and perform the above-mentioned reorganization. By doing this, it is possible to reorganize with the latest data without waiting until the predetermined time arrives, so if there is a master station that suspends operation, it is possible to quickly shift to standby mode. You can save electricity. In this case, the measurement by the occupancy rate measuring unit 1a does not satisfy the predetermined time. Therefore, for example, if the predetermined interval is 10 minutes and the current time is 5 minutes, the total of the data transmission amounts currently held is doubled for calculation.

When there is no corresponding slave station when the power of the power supply unit 1c of the master station 2 is turned on when the company (not shown) installed in the master station 2 starts the operation. The standby mode may be set by an instruction from the control unit 1h to the power supply unit 1c. By doing so, the operation of the master station 2 can be temporarily stopped until the control limit of the master station 1 is reached, so that power consumption can be saved. Further, the other master stations 2 other than the specific master station 1 may be turned off by an instruction from the control unit 1h to the power supply unit 2c when the corresponding last slave station logs out. By doing so, the operation can be temporarily stopped without waiting for the end of the predetermined measurement time in the occupancy ratio measuring unit, so that power consumption can be saved.

A second embodiment of the wireless LAN system according to the present invention will be described below with reference to the block diagram of FIG. In the wireless LAN system, for example, a master station 21 and a master station 22 installed in the same room are connected by a LAN cable 23. Corresponding to each master station, the master station 21 has slave station numbers # 1 to # 4. In the slave stations 11 to 14 and the master station 22, the slave stations 15 to 16 with the slave station numbers # 5 to # 6 are managed by the respective master stations. Since the frequencies of the radio waves output by the master stations 21 and 22 are different, even if each master station is placed in the same room, the radio wave range 24 of the radio wave of the line or the radio wave range 25 of the radio wave of the line reaches. Each of the arranged slave stations can wirelessly transmit data with the corresponding master stations 21 and 22.

Each master station measures an amount of data transferred between the master station and the corresponding slave station at a constant time interval and calculates an occupancy rate of the line, and an occupancy rate measuring section 21a. A memory 21b for storing a rate, a power supply unit 21c for supplying power to each unit and turning on or off according to an input control signal, and a power supply control unit 21d for controlling the power supply unit 21c of another master station, respectively. LAN cable 2 that connects to the master station
LAN interface 21e to which 3 is connected, an antenna 21f for transmitting and receiving radio signals to and from each slave station, and a radio modem 21g for mutually converting radio signals and digital data.
And the communication control of each slave station, and the occupation rate measuring unit 2
1a, a memory 21b, a power supply unit 1c, a power supply control unit 21d, a LAN interface 21e, and a wireless modem 21g, and a control unit 21h that controls a power supply control unit 21d of a predetermined specific master station 21. It is composed of a power supply control line 26 for transmitting a signal to the power supply unit 21c of another master station 22. On the other hand, the slave station 11 comprises an antenna 11a for transmitting and receiving radio signals to and from the parent station 21, a radio modem 11b for mutually converting radio signals and digital data, and a personal computer 11c connected to the radio modem 11b. There is.

The second embodiment differs from the first embodiment described above only in the method of controlling the power supply of the other master station 2. Therefore, the difference will be described here. In the first embodiment, since the master station 1 controls the power source of the master station 2, the LA station
The power supply control signal is transmitted via N. Therefore, in order to receive the power-on instruction, the LAN of the master station 2
The interface 1e and the control unit 1h must always be operated. Therefore, the auxiliary power supply unit 1d that operates these is required. On the other hand, in the second embodiment, in order to control the power supply of the master station 22, the master station 21 is provided with a power supply control unit 21d, and by the power supply control line 26 connected to the power supply unit 21c of the master station 22, A relay (not shown) provided in the power supply unit 21c of the master station 22 is controlled to control turning on and off of AC power to the master station 22. Therefore, the master station 22 whose power has been cut off is completely out of operation, and power consumption can be further saved as compared with the first embodiment.

[0027]

As described above, according to the wireless LAN system of the present invention, the data transfer amount of each master station transferred between the same master station and the corresponding slave station can be calculated at regular time intervals. Occupancy rate measurement unit that measures and calculates line occupancy rate, memory that stores line occupancy rate, LAN interface, wireless modem to which antenna is connected, occupancy rate measurement unit, memory, and power supply to wireless modem And a control unit for controlling the power supply unit, the occupancy ratio measuring unit, the memory, the LAN interface, and the wireless modem, and the LAN interface and the control unit. The auxiliary power supply unit that always supplies power to the control unit, and the control unit stores the line occupation rate sent from the occupation rate measuring unit, the number of slave stations corresponding to the master station, and the slave station number in the memory. The predetermined specific master station acquires the line occupation rate, the number of slave stations corresponding to the master station, and slave station management data from the other master stations via the LAN at regular intervals. Stored in the memory, the specific master station determines the number of slave stations in the memory or the line occupancy rate, and based on the result of the determination, a power control signal for controlling the power supply unit of another master station via the LAN. The control unit of the other master station that has transmitted to the other master station and received the same power supply control signal turns on or off the power supply of the power supply unit of the other master station according to the content of the power supply control signal. It is possible to centralize and manage the slave stations as much as possible, and to turn off the power of the master station that has no corresponding slave station to save power consumption.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of a wireless LAN system according to the present invention.

FIG. 2 is an explanatory diagram showing memory contents of a master station, (A)
Describes the case where the slave stations are aggregated, and (B) illustrates the case where the slave stations are distributed.

FIG. 3 is a block diagram showing a second embodiment of the wireless LAN system according to the present invention.

FIG. 4 is a block diagram showing a conventional wireless LAN system.

[Explanation of symbols]

1 parent station 1a Occupancy rate measurement unit 1b memory 1c power supply 1d Auxiliary power supply 1e LAN interface 1f antenna 1g wireless modem 1h control unit 2 parent stations 3 LAN cable 4 radio range 5 radio range 11 slave stations 11a antenna 11b wireless modem 11c personal computer 12, 13, 14, 15, 16 Slave stations 21 Master station 21a Occupancy rate measuring unit 21b memory 21c Power supply section 21d Power control unit 21e LAN interface 21f antenna 21g wireless modem 21h Control unit 22 Master station 23 LAN cable 24 radio range 25 radio range 26 Power supply control line

Claims (9)

[Claims] 1. A plurality of master stations connected by a LAN (Local Area Network) and radio stations are arranged within a range within which radio waves output by all the master stations reach, and one corresponding master station. In a wireless LAN system consisting of a plurality of slave stations that perform data transmission, each master station measures the amount of data transferred at fixed time intervals between the master station and the corresponding slave station, An occupancy rate measuring unit for calculating a line occupancy rate, a memory for storing the line occupancy rate, a LAN interface, a wireless modem to which an antenna is connected, an occupancy rate measuring unit, the memory, and the wireless modem. A power supply unit that supplies power and turns on and off according to an input control signal, the power supply unit, the occupancy rate measurement unit, the memory, and the LAN.
The control unit controls an interface and the wireless modem, and an auxiliary power supply unit that always supplies power to the LAN interface and the control unit, and the control unit is sent from the occupation rate measuring unit. The line occupancy rate, the number of the slave stations corresponding to the master station, and the slave station number are stored in the memory, and the predetermined specific master station is the occupancy rate of the line at regular intervals. And the number of the slave stations corresponding to the master station and slave station management data are acquired from the other master stations via the LAN, and stored in the memory for each slave station, The master station judges the number of the slave stations in the memory or the occupation rate of the line, and based on the result of the judgment, sends a power supply control signal for controlling the power supply unit of the other master station to the other one via the LAN. Send to the master station and supply the same power The wireless LAN system, wherein the control unit of the other master station that receives the control data turns on or off the power of the power supply unit of the other master station according to the content of the power control signal. 2. A plurality of master stations connected by a LAN and a plurality of master stations which are arranged within a reach of radio waves output from all the master stations and wirelessly transmit data between the corresponding one master station. In the wireless LAN system including the slave stations, the amount of data transferred to each of the master stations at regular time intervals between the master station and the corresponding slave station is measured, and the line occupancy ratio is calculated. An occupancy rate measuring section for calculating, a memory for storing the occupancy rate of the line, a power source section for supplying power to each section and turning on or off according to an input control signal, and a power source section for the other master station. Output from a power supply control unit that controls the occupancy ratio measurement unit, the memory, the power supply unit, and the power supply control unit, and a predetermined power supply control unit of the master station. The control signal of the other master station A power supply control line for transmitting to a source unit is provided, and the control unit stores the occupancy rate of the line sent from the occupancy rate measurement section, the number of the slave stations corresponding to the master station, and the slave station number in the memory. In the specific master station, the occupancy of the line, the number of the slave stations corresponding to the master station, and slave station management data are stored in the LAN from other master stations at regular intervals. The specific master station determines the number of the slave stations in the memory or the occupancy rate of the line, and the power supply unit of the other master station according to the result of the determination. A wireless LAN system characterized by being turned on or off. 3. The specific master station searches for a combination of the master stations in which the total occupancy of the lines of each master station stored in the memory is a predetermined value or less, and responds to the combination. 2. The management of the slave station is reorganized into one of the master stations, and as a result of the reorganization, the power source of the master station without the corresponding slave station is turned off. Alternatively, the wireless LAN system according to claim 2. 4. The particular master station searches for a combination of the master stations in which the total number of the slave stations of each master station stored in the memory is equal to or less than a predetermined value, and corresponds to the combination. 2. The management of the slave station is reorganized into one of the master stations, and as a result of the reorganization, the power source of the master station without the corresponding slave station is turned off. Alternatively, the wireless LAN system according to claim 2. 5. The specific master station retrieves the line occupancy of each master station stored in the memory, and when the average value of the line occupancy of the line is equal to or more than a predetermined value, the current power supply is used. Is turned on, the power of the power unit of the other master station is turned on, the management of the corresponding slave station is evenly distributed to the currently operating master station, and reorganization is performed. The wireless LAN system according to any one of claims 1 to 3. 6. The specific master station searches the number of the slave stations corresponding to the master station stored in the memory, and the average value of the numbers of the slave stations is equal to or more than a predetermined value. Characterized in that the power of the other master station that is currently powered off is turned on, the management of the corresponding slave station is evenly distributed to the currently operating master station, and reorganization is performed. The wireless LAN system according to claim 1, claim 2, or claim 4. 7. The master station sets the occupation data of the line, the number of slave stations corresponding to the master station, and the slave station management data when the corresponding slave station logs on or logs out. To the station via the LAN, and the specific master station which received the same is stored in the memory, and the other master station is transmitted to another station according to the number of the slave stations corresponding to the other master station or the occupation rate of the line. 7. The power supply unit of the master station is turned on or off.
The wireless LAN system described. 8. The control unit instructs the power supply unit of its own to disconnect when the power supply unit of the master station is powered on and there is no corresponding slave station. The wireless LAN system according to any one of claims 1 to 7. 9. The control unit of the other master stations other than the specific master station issues a disconnection instruction to its own power supply unit when the corresponding last slave station logs out. The wireless L according to any one of claims 1 to 8, wherein
AN system.