JP2002281043A - Wireless lan system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wireless LAN system equipped with a function for allowing an operator who operates a slave station to objectively recognize the line occupancy ratio of each master station. SOLUTION: A transmission data measuring part 11e measures and adds data transfer quantity per unit time transmitted and received by an LAN I/F 11a and a slave station 13 under control through a control part 11d. The control part 11d transfers the transfer quantity data to an arithmetic part 11g, and allows the arithmetic part 11g to calculate a line occupancy ratio, and allows a memory 11f to store the line occupancy ratio as the arithmetic result in each time zone. When the line occupancy ratio is requested from the slave station 13, the master station 11 requests the pertinent line occupancy ratio to the other master station 11, and adds the answer result to the line occupancy ratio of its own, and transmits the line occupancy ratio as the answer data to the slave station 13 being the origin of request. The slave station 13 which receives the answer data converts the answer data into a video signal, and allows a display part 13e to display the line occupancy ratio as numerical values or a graph.

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 a wireless LAN system in which a master station and a slave station transfer data using radio.

[0002]

2. Description of the Related Art Conventionally, a wireless LAN system has a configuration shown in FIG. 5 as an example. In the wireless LAN system, for example, a master station 81 installed on the first floor of a building and a master station 82 installed on the second floor in the same building are connected by a LAN cable 86, and corresponding to each master station, In the master station 81, four slave stations 83 are arranged, and in the master station 82, two slave stations 83 are arranged. Since the radio waves output by the master stations 81 and 82 are weak, the radio waves of the master stations separated on the first and second floors of the same building do not overlap each other even if they use the same frequency. Each of the slave stations 83 arranged in the area 84 or the area 85 can wirelessly transmit data to and from the corresponding master station 81 or 82. Since each master station and each slave station 83 are wirelessly connected to the LAN, the salesperson inputs the slip data entered outside the company using a notebook computer to the office and quickly connects it to the in-house server. Can be processed. Therefore, the number of slave stations 83 connected to the master station is constantly changing. The master station is a LAN I / F (Local Area Network Interface) to which a LAN cable 86 connecting each master station is connected.
e) 81a, an antenna 81b for transmitting and receiving wireless signals to and from the slave station 83, a wireless modem 81c for mutually converting wireless signals and digital data, and a control unit 81d for controlling communication of each slave station. , LAN I / F 81a, control unit 81d, wireless modem 81c, and antenna 81b 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 radio modem 8
3b is connected to a personal computer 83c. Each master station can manage up to a predetermined number of slave stations 83, and if the number of slave stations is within the range, the slave station 83 can manage the master station 8
It is configured to function similarly regardless of whether it is located in the area 84 under the jurisdiction of one or the area 85 under the jurisdiction of the master station 82.

However, for example, the number of slave stations 83 is concentrated in an area 84 under the jurisdiction of the master station 81 or the master station 8
1 and a specific slave station 83 in the area 84 are performing data transfer preferentially, the other slave stations 83 in the same area 84 do not have enough time to communicate with the master station 81, so that data transfer is not possible. Was not able to be performed, and there was a case where the business was hindered. On the other hand, in the area 85 under the jurisdiction of the master station 82, the number of slave stations 83 is small, so that data transfer may hardly be performed in some cases, and the efficiency of the entire system is poor. Therefore, the operator operating the slave station objectively recognizes the line occupancy of each master station, and operates the slave station based on the result, so that the total data transfer in the area 84 and the area 85 can be achieved. A wireless LAN system capable of averaging the amount and operating the entire system efficiently has been desired.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a wireless LAN system having a function of allowing an operator operating a slave station to objectively recognize the line occupancy of each master station. It is intended to provide.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of master stations connected by a LAN (Local Area Network) and a mobile station within a range where radio waves output from the respective master stations reach. In a wireless LAN system including a plurality of slave stations arranged and performing wireless data transmission with the corresponding specific master station, each of the master stations has the same master station and the corresponding slave station. A transmission data measurement unit that measures the data transfer amount for each time zone transferred between the transmission data measurement unit, and transfer amount data based on the data transfer amount sent from the transmission data measurement unit at regular intervals, using a predetermined formula. A calculating unit for calculating, a memory for storing a calculation result of the calculating unit, a control unit for controlling the transmission data measuring unit, the calculating unit, and the memory are provided; Control transmission data transmission and reception A display control unit for converting data transmitted from the master station to a video signal, a display unit for displaying the video signal converted by the display control unit, and an operation unit for operating the slave station, The control unit causes the transfer amount data sent from the transmission data measurement unit to be transferred to the calculation unit, and causes the calculation unit to calculate a line occupancy using the transfer amount data. Data is stored in the memory for each time zone of the master station,
In response to the transmission request of the line occupancy from the slave station, the master station acquires the line occupancy data of another master station, and also acquires the line occupancy data of the master station itself. Aggregate and transmit the aggregated line occupancy ratio data to the requesting slave station, and the slave station displays the received line occupancy ratio data on the display unit.

The line occupancy is calculated from the maximum data transfer amount in the same unit time as the data transfer amount for each time zone measured by the master station.

In the line occupancy data transmitted to the slave station, at least the data transfer amount measured in the latest time zone among the data transfer amounts of all the master stations completed in the same time zone. Include the latest line occupancy calculated using

[0008] The line occupancy data transmitted to the slave station includes the latest line occupancy and the line occupancy in a continuous time zone earlier than the latest line occupancy.

[0009] The slave station converts the received line occupancy data into a graph of the time zone of each master station and the line occupancy, and displays the graph on the display unit.

The slave station determines the master station having the currently lowest line occupancy based on the received latest line occupancy data and displays the master on the display unit.

[0011] The slave station requests the line occupancy at the time of logging into the wireless LAN system.

[0012] The slave station requests the line occupancy by a specific operation of an operator operating the slave station.

The slave station requests the line occupancy at predetermined time intervals set in advance in the slave station, and the latest line occupancy of the latest line occupancy data transmitted from the host computer is: The latest line occupancy is displayed on the display unit when the value becomes equal to or smaller than the set line occupancy of the master station preset in the slave station.

The slave station requests the line occupancy at predetermined time intervals set in advance in the slave station, and the latest line occupancy of the latest line occupancy data transmitted from the host computer is: The line occupancy is displayed on the display unit when the line occupancy becomes equal to or greater than the set line occupancy of the master station preset in the slave station.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a wireless LAN system according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of a wireless LAN system according to the present invention. The master station 11 is installed on the first floor of the building,
Is located on the second floor of the same building. Also, corresponding to each master station, four slave stations 13 are arranged in the master station 11, and two slave stations 13 are arranged in the master station 12. Since the radio waves output from the master stations 11 and 12 are weak, the radio waves of the master stations separated on the first floor and the second floor of the same building do not overlap each other even if they use the same frequency. Area 14 or Area 1
5, each of the slave stations 13 has a corresponding master station 11,
12 can be wirelessly transmitted. The master station is connected to another master station via a LAN cable 16, and a LAN I / F (Local Area Network Interface) is provided.
11a, antenna 1 for transmitting and receiving radio signals to and from slave station 13
1b, a wireless modem 11c for mutually converting wireless signals and digital data, and a transmission data measuring unit 11 for measuring a data transfer amount per unit time transmitted and received through a master station.
e, an operation unit 11g for calculating the transfer amount data based on the data transfer amount transmitted from the transmission data measurement unit 11e at regular intervals by a predetermined formula, and a memory 11f for storing the operation result of the operation unit And a control unit 11d that controls communication between the slave stations 13 and controls the transmission data measurement unit 11e, the calculation unit 11g, and the memory 11f. LAN I / F 11a, control unit 11d,
Each block is connected in the order of the wireless modem 11c and the antenna 11b, and the transmission data measurement unit 11e, the operation unit 11g, and the memory 11f are connected to the control unit 11d. Although not shown, the control unit 11d has a clock function inside. On the other hand, the slave station 13 includes an antenna 13a for transmitting / receiving a radio signal to / from the master station, a radio modem 13b for mutually converting a radio signal and digital data, and a radio modem 13b.
And a personal computer 13c connected to the personal computer 13c. Further, the personal computer 13c includes a display control unit 13d for controlling transmission and reception of the wireless LAN of the slave station 13 and converting data received by the wireless LAN into a video signal, and a display unit 13e for displaying the converted video signal. And an operation unit 13f including a keyboard for operating the slave station 13. Each master station can manage up to a predetermined number of slave stations 13. If the number of slave stations is within this range, the slave station 13 is under the jurisdiction of the area 14 within the jurisdiction of the master station 11 and the jurisdiction of the master station 12. It is configured to function similarly regardless of which of the areas 15 is located.

The operation of the above configuration will now be described. In order to determine the line occupancy of each of a plurality of master stations, which is a problem according to the present invention, the amount of data transferred between the master station and a plurality of slave stations corresponding to each master station is calculated for each unit time. Must be measured. Here, the unit time is described as 10 minutes. The transmission data measuring unit 11e described above has a function of measuring the unit time. The transmission data measurement unit 11e measures and adds up the data transfer amounts per 10 minutes (unit time) transmitted and received between the LAN I / F 11a and the slave station 13 within the jurisdiction through the control unit 11d according to the instruction of the control unit 11d. I do. Since the master station and the slave station 13 use wireless communication, data retransmission occurs due to noise or data collision between slave stations. However, invalid data at this time is not measured, and pure data is received from the LAN I / F 11a. Only the data transferred to the slave station 13 and the data transferred from the slave station 13 to the LAN I / F 11a are measured.

In the control unit 11d, the transmission data measurement unit 11
transfer the transfer amount data measured in step e to the calculation unit 11g,
Using this transfer amount data, the line occupancy is calculated by the calculation unit 11g, and the line occupancy of the calculation result is stored in the memory 1 for each time zone.
The data is stored in 1f as data. The line occupancy is calculated by using the maximum transfer data amount for 10 minutes at the design value calculated for each master station as the denominator and calculating the actually measured transfer data amount for 10 minutes as the numerator. In this example, 10
The maximum transfer data amount per minute is assumed to be 1000 megabytes for both master stations. When there is a request for the line occupancy from the slave station 13, the master station requests the corresponding line occupancy from other master stations according to a message format described later, and combines the response result with its own line occupancy. Is transmitted to the requesting slave station 13 as answer data. In the slave station 13 which has received the answer data, the display controller 13d of the personal computer 13c converts the answer data into a video signal and causes the display 13e to display the line occupancy. The operator (not shown) of the slave station 13 judges the displayed line occupancy, and
To determine future operations. For example, when the line occupancy of the master station 11 installed on the first floor of a building is very high, the master station with a lower occupancy, for example, the master station 12 installed on the second floor of the same building, is connected with a notebook computer. The slave station 13 itself is moved, or communication with the master station 11 is temporarily suspended. As described above, the function of allowing the slave station 13 to check the line occupancy allows the operator operating the slave station to objectively recognize the line occupancy of the two master stations, the master station 11 and the master station 12. Wireless LAN system provided with

FIG. 2 is a diagram showing an example of the format of a message related to the present invention, and shows only the content data of the transfer data transmitted / received through the LAN. Therefore, data and headers for error checking are not shown. Hereinafter, terms used in FIG. 2 will be described. Message number: Indicates the type of message format that includes the message number. The receiving side processes the subsequent data based on the message number by dividing the data into a predetermined number of bytes. Here, it is defined as follows. 1: Request of line occupancy data from slave station to master station (total master station). 2: Request of line occupancy data from the master station (total master station) to another master station (target master station). 3: Response of line occupancy data from another master station (target master station) to the master station (total master station). 4: Response of the line occupancy data from the master station (total master station) to the slave station. Aggregation master station number: Indicates the number of the master station that has received the aggregation request from the slave station. # 1: Number indicating the master station 11 in FIG. # 2: Number indicating the master station 12 in FIG. Measurement time: Indicates when the measured transfer data amount is. For example, if the content is 0:00, 0:
This means that data transferred between 00 and 0:10 was measured. In this way, 24 hours from 0:00 to 2
The time zone is divided at intervals of 10 minutes up to 3:50. Transfer data amount: Shows the total transfer data amount transferred during the target time period. The unit is megabytes. Slave station number: Indicates the number of the slave station that has issued the message format of the line occupancy request. The master station (aggregation master station) returns an answer to the slave station having this slave station number. In the example of FIG. 1, the numbers of the slave stations # 1 to # 6 are assigned to the slave stations. Target master station number: The number of the master station that is the target of the measurement results required by the slave station. Since there are a plurality of master stations, the format is repeated in the format by the number of master stations together with time zone data described later. # 1: Number indicating the master station 11 in FIG. # 2: Number indicating the master station 12 in FIG. Time zone: The time zone subject to the line occupancy required by the slave station. In this example, since the content is every 10 minutes, if this content is 0:10, it indicates a range from 0:10 to 0:20. Along with the target master station number, the number of master stations is repeated and described in the format. Occupancy rate: Numerical value calculated as the denominator with the maximum transfer data amount for 10 minutes at the design value calculated for each master station, and the numerator as the numerator of the actual transfer data amount measured for 10 minutes. . The target master station number, time zone, and occupancy are repeated by the number of master stations and described in the format.

Next, the actual procedure will be described using the above-mentioned message format. As described above, the data transfer amount every 10 minutes measured by the transmission data measurement unit 11e of the master station is equal to the predetermined time (0 minute, 10 minutes, 20 minutes,
The operation unit 11g calculates the line occupancy every 30 minutes, 40 minutes, and 50 minutes) and stores the calculated line occupancy in the memory 11f. In the memory 11f, the time zone 20a shown in FIG.
It has a table 20 with a line occupancy 20b corresponding to 0a. FIG. 4A shows the table 20 stored in the memory 11f of the master station # 1, and FIG. 4B shows the table 20 stored in the memory 11f of the master station # 2.

For example, if the current time is 1:10,
The control unit 11d selects the item of the time zone 20a of the table 20 corresponding to 1:00 of the measurement time, and adds the data transfer amount measured by the transmission data measurement unit 11e, for example, 850 megabytes to the corresponding item of the line occupancy 20b. Write the line occupancy calculated from. As described above, since the maximum transfer data amount for 10 minutes at the design value is 1000 megabytes, the line occupancy of the master station # 1 from 1:00 to 1:10 is 85
0 ÷ 1000 = 0.85, which is calculated as 85%, and 85 is written in the item of the line occupancy 20b. As described above, the table 20 records data for the past 24 hours. For this reason, old data is overwritten by new data in the same time zone, so that the latest data is always recorded.

Here, a case will be described in which a slave station requests a line occupancy from a master station (total master station) using the message format shown in FIG. 2A. For example, the current time is 1:15
When it is desired to refer to the past four time zones that are continuous with the immediately preceding time zone, if the slave station number of the requested slave station 13 is # 1 and the master station numbers to be referred to are # 1 and # 2, the message Each item of the format is as follows. Message number: 1, slave station number: # 1, target master station number: # 1,
Time zone: 1:00, target parent station number: # 2, time zone: 1:
[0099] Similarly, the necessary target parent station number and time zone are described consecutively in a message by designating the past four time zones. This message format is created by a program built in the display control unit 13d of the slave station 13 and transmitted to the master station 11 via the wireless modem 13b.

On the other hand, when the master station 11 receives the message format from the slave station 13, the control section 11d determines from the message number that the request is for the line occupancy rate from the slave station, and determines the target master station of the message format. The table 20 of the master station 11 of # 1 is referred to by the number: # 1, and the time zone 20a of the table 20 corresponding to the time zone of the message format: 1:00.
And reads the line occupancy data: 85 from the corresponding item of the line occupancy 20b. Similarly, all the line occupancy data corresponding to the designated time zone is read. Also, since the target master station number: # 2 is another master station 11, a message format of the individual occupancy request shown in FIG. 2B is created in the other master station 11, and the master station 11 of # 2 (target To the parent station). The contents of the message format are as follows. Message number: 2, Total master station number: 1, Time zone: 1:00,
... (Specify the time zone of the target master station number specified by the above-mentioned message number: 1)

The # 2 master station 11 (target master station) that has received this message determines that the request is the individual occupancy request from the message number: 2, and stores the request in the memory 11f inside the master station 11 (target master station). From the table 20, the time zone designated by the received message: 1:00 and the corresponding line occupancy data: 35 are read. Further, reading is similarly performed for the past four time zones.

Next, the # 2 master station 11 (target master station) converts the read line occupancy data into the # 1 master station 11 (total master station) using the message format shown in FIG. 2C. To answer. The contents of the message format are as follows. Message number: 3, target parent station number: 2, time zone / occupancy: The data read from the above-described table 20 are described alternately in time zone and occupancy.

Master station 1 that has received this message format
1 (summary master station) combines the line occupancy data corresponding to the time zone designated by the master station 11 (summary master station) itself with the data of the other master station 11 (target master station). A reply is sent to the slave station 13 that has made the request.

Next, the case where the line occupancy is returned to the slave station 13 using the message format shown in FIG. 2D will be described.
Since the message number in the message format is the response of the line occupancy from the tabulation master station to the slave station, the target master station number is # 1,
The time zone is 1:00, the occupancy rate is 85, and the target master station number is #
2. The time zone is 1:00, and the occupancy is 35. Similarly, the last four time zones are continuously written in a message and transmitted to the slave station 13 of the slave station number # 1 which has issued the request.

On the other hand, when the slave station 13 receives the reply data in the above-described message format, the display control unit 13d determines, based on the message number 4 in the message format, that the reply is the response of the line occupancy from the tabulation master station to the slave station. Then, the display screen shown in FIG. 4 is displayed on the display section 13e as a line occupancy list for each access point. The item of master station # 1 on the screen corresponds to the target master station number in the message format, the item such as current or -10 minutes corresponds to the time zone, and the item such as 85% or 70% corresponds to the occupancy. I have. Note that the time zones in this example are currently -10 minutes, -20 minutes, -30 minutes, and -40 minutes: 1:00, 0:50, 0:40, 0:30, 0: 2.
0 respectively. The line occupancy data transmitted to the slave station 13 as in this example is the latest line occupancy data calculated using the data transfer amount measured in the latest time zone (the current line occupancy data on the screen in FIG. 3). ), You can always check the latest line congestion status. The line occupancy data to be transmitted to the slave station 13 includes the above-described latest line occupancy data and the line occupancy data in a continuous time zone earlier than the latest line occupancy data (the screen in FIG. 3). -10
-40 minutes), it is possible to confirm the movement of the line congestion status that changes over time. In addition, each master station 11
Since the 24-hour transfer data amount is recorded for each master station, the slave station 13 can check the movement of the line congestion situation in one day. Can perform business.

In the slave station 13, as shown in FIG. 3, a numerical value expressing the received line occupancy data as a percentage is displayed for each master station. For this reason, the degree of line congestion can be compared as a numerical value.
It is possible to objectively determine whether to keep the slave station 3 in the master station to which the slave station 13 belongs or to move the slave station 13 to another master station.

The slave station 13 has a function of converting the received line occupancy data into a line graph of the time zone and the line occupancy for each master station and displaying the line graph. As shown in FIG. The change in the line occupancy can be visually observed as the past five consecutive time zones. Therefore, slave station 1
The operator of No. 3 predicts to some extent the change in the line occupancy beyond the present based on the slope of the graph in the past time zone, and decides whether or not to make the slave station 13 stay in the master station to which the slave station 13 belongs in advance. It is possible to objectively determine whether to move the slave station 13 itself to another master station.

The slave station 13 receives the received master station 11 and master station 1
The display control unit 13d compares the latest line occupancy ratio of the latest line occupancy ratio data with the latest line occupancy ratio data, and determines the master station having the lowest line occupancy ratio and displays it on the display unit 13e of the personal computer 13c.
In the example of the screen display of FIG. 3, the line occupancy of the master station # 1 is 85
3 and the line occupancy of the master station # 2 is 35%.
, A frame is displayed in the character portion of the master station # 2, and green marking is given. Therefore, the magnitude of the line occupancy can be visually determined.

When the power of the slave station 13 is turned on or when the operator logs in to the wireless LAN system by operating the keyboard of the operation unit 13f, the program in the display control unit 13d of the personal computer 13c provided in the slave station 13 is set. The control may automatically request the master station 11 for the line occupancy. This not only saves the operator from having to perform the operation of requesting the line occupancy, but also allows the operator to grasp the line occupancy before starting the work, so that the operator can set up the work in the future, It is possible to objectively determine in advance whether the slave station 13 is to remain at the master station to which the slave station 13 belongs or whether the slave station 13 itself is moved to another master station.

When the operator operating the slave station 13 performs a specific operation of the operation unit 13f, for example, pressing a function key of a keyboard, the display control unit 13d requests the master station 11 for the line occupancy. You may. In this way, the line occupancy can be requested at any time according to the operator's needs, so that the operator can set up the business in the future or set the child station 13 as the parent station to which the child station 13 belongs as a future plan. It is possible to objectively determine whether to stay at the station or move the slave station 13 to another master station.

Further, the display control unit 13 provided in the slave station 13
By the program control of d, the line occupancy is automatically requested from the master station 11 at predetermined time intervals set in the slave station 13 in advance, and the latest line occupancy of the latest line occupancy data transmitted from the master station 11 is obtained. When the rate becomes equal to or smaller than the set line occupancy of the master station preset in the slave station 13, the latest line occupancy is displayed on the display unit 13e of the personal computer 13c.
May be displayed. For example, when the current line occupancy of the master station # 1 is 85% as shown in the screen of FIG.
If the task of transferring a large amount of data is to be preferentially executed, the line capacity of the master station # 1 may overflow. If it is executed as it is, communication with the other slave stations 13 becomes impossible, so it is necessary to wait for a while until the line is free. However, simply waiting is a waste of time, and the operator instructs the slave station 13 to operate by operating the operation unit 13f. The content of the instruction is 10
The request for the line occupancy at the minute interval to the master station 11, the master station number is the master station # 1, and the set line occupancy is 60%. The slave station 13 compares the latest line occupancy of the latest line occupancy data transmitted from the master station 11 every 10 minutes with the set 60%, and determines whether the current latest line occupancy is 60%, or When it becomes lower than that, a display such as the screen of FIG. 4 is displayed on the display unit 13e of the personal computer 13c to notify the operator. After confirming this display, the operator performs a large amount of data transfer. With this function, the operator can perform other tasks until the designated line falls to the designated line occupancy rate, and in the meantime, another slave station can communicate with the master station # 1. Can be used effectively.

Alternatively, the display control unit 13 provided in the slave station 13
By the program control of d, the line occupancy is automatically requested from the master station 11 at predetermined time intervals set in the slave station 13 in advance, and the latest line occupancy of the latest line occupancy data transmitted from the master station 11 is obtained. The latest line occupancy may be displayed on the display unit 13e of the personal computer 13c when the rate becomes equal to or larger than the set line occupancy of the master station preset in the slave station 13. For example, when the current line occupancy of the master station # 2 is 35% as shown in the screen of FIG. As the time elapses, the number of slave stations 13 increases, and as a result, the line capacity of the master station # 2 may overflow. If the operator continues to work without knowing it, communication with other slave stations 13 becomes impossible, so that it is necessary to wait for a while until the line is free. However, since it is troublesome and time-consuming for the operator to always request the line occupancy rate from the master station 11 by operating the keyboard of the operation unit 13f, the operator operates the slave station 13f by operating the operation unit 13f. To the operation. The content of the instruction is a request to the master station 11 for the line occupancy at 10 minute intervals, the master station number is the master station # 2, and the set line occupancy is 90%. The slave station 13 compares the latest line occupancy of the latest line occupancy data transmitted from the master station 11 every 10 minutes with the set 90%, and determines that the current latest line occupancy is 90%.
When it becomes longer than this, a display such as the screen of FIG. 4 is displayed on the display unit 13e of the personal computer 13c to notify the operator. After confirming this display, the operator interrupts the transfer of a large amount of data or moves to a master station having another available line to continue the business. With this function, the operator can use up to the capacity of the line of the master station and can effectively use the line of the master station of the entire system.

In the example described above, the time period is set to every 10 minutes, but it may be set to every 5 minutes or 1 minute. By making the time zone finer, a more accurate line occupancy rate can be obtained. In addition, since the master station itself has a function of measuring the line occupancy rate and counting the line occupancy rates of other master stations, even if a certain master station goes down, the master station other than the master station that caused the system down can be used. The station can use the functions of the present application without any trouble and can provide a reliable system.

[0036]

As described above, according to the wireless LAN system of the present invention, a LAN (Local Area Network)
Wireless LAN, comprising: a plurality of master stations connected by a network; and a plurality of slave stations arranged in a range where radio waves output from the respective master stations can reach and perform wireless data transmission with a corresponding specific master station. In the system, the control unit of the master station causes the transfer amount data sent from the transmission data measurement unit to be transferred to the operation unit, and the operation unit calculates the line occupancy using the transfer amount data. Data is stored in the memory for each time zone of the master station. On the other hand, in response to the transmission request of the line occupancy rate from the slave station, the master station obtains the line occupancy rate data of the other master stations and also tallies the line occupancy rate data of the master station itself. And transmits the obtained line occupancy data to the requesting slave station. The slave station receiving this displays the received line occupancy data on the display unit, and the operator operating the slave station objectively recognizes the line occupancy of each master station,
By moving a child station to another master station with a low line occupancy or temporarily refraining from data transmission of the own station, the line occupancy of each master station is averaged, and the entire wireless LAN system is Can be improved.

[Brief description of the drawings]

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

FIG. 2 is an embodiment of a message format of the wireless LAN system according to the present invention.

FIG. 3 is an embodiment of a display screen of a slave station of the wireless LAN system according to the present invention.

FIG. 4 is an embodiment of a block diagram showing a memory provided in each master station of the wireless LAN system according to the present invention.

FIG. 5 is a block diagram showing a conventional wireless LAN system.

[Explanation of symbols]

 Reference Signs List 11 master station 11a LAN I / F 11b antenna 11c wireless modem 11d control unit 11e transmission data measurement unit 11f memory 11g calculation unit 12 master station 13 slave station 13a antenna 13b wireless modem 13c personal computer 13d display control unit 13e display unit 13f operation unit 14 Area 15 Area 16 LAN cable 20 Table 20a Time zone 20b Line occupancy

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04B 7/26 K

Claims (10)

[Claims] 1. A wireless communication between a plurality of master stations connected by a LAN (Local Area Network) and radio waves output from the respective master stations and corresponding to the specific master station. In a wireless LAN system including a plurality of slave stations performing data transmission, a transmission for measuring a data transfer amount for each time zone transferred between the master station and the corresponding slave station to each of the master stations. A data measurement unit, a calculation unit that calculates transfer amount data based on the data transfer amount sent from the transmission data measurement unit at regular intervals by a predetermined calculation formula, and a memory that stores a calculation result of the calculation unit And a control unit that controls the transmission data measurement unit, the calculation unit, and the memory, wherein the slave station controls transmission data transmission / reception of the slave station and transmits data transmitted from the master station. Table to convert to video signal A control unit, a display unit for displaying the video signal converted by the display control unit, and an operation unit for operating the slave station, wherein the control unit transmits the transfer transmitted from the transmission data measurement unit Amount data is transferred to the operation unit, and the line occupancy is calculated by the operation unit using the transfer amount data, and the calculated line occupancy data is stored in the memory for each time zone of the master station. In response to the transmission request of the line occupancy from the slave station, the master station acquires the line occupancy data of another master station, and acquires the line occupancy of the master station itself. Wireless LAN, wherein the wireless LAN is further configured to aggregate data together and transmit the aggregated line occupancy ratio data to the requesting slave station, and the slave station displays the received line occupancy ratio data on the display unit. system. 2. The communication system according to claim 1, wherein the line occupancy is calculated from a maximum data transfer amount per unit time equal to a data transfer amount for each time zone measured by the master station.
The wireless LAN system according to the above. 3. The line occupancy ratio data transmitted to the slave station is at least the data measured in the latest time zone among the data transfer amounts of all the master stations whose measurement has been completed in the same time zone. 3. The wireless LAN system according to claim 1, further comprising a latest line occupancy calculated using the transfer amount. 4. The line occupancy ratio data transmitted to the slave station includes the latest line occupancy ratio and the line occupancy ratio in a continuous time zone earlier than the latest line occupancy ratio. The wireless LAN system according to claim 3, wherein: 5. The mobile station according to claim 1, wherein the slave station converts the received line occupancy ratio data into a graph of a time zone for each master station and the line occupancy ratio, and displays the graph on the display unit. The wireless LAN system according to any one of claims 1 to 4. 6. The mobile station according to claim 3, wherein the slave station determines the master station having the currently lowest line occupancy based on the received latest line occupancy data and displays the master station on the display unit. Wireless LAN system. 7. The wireless LAN system according to claim 1, wherein the slave station requests the line occupancy when logging in to the wireless LAN system. 8. The wireless LAN system according to claim 1, wherein the slave station requests the line occupancy by a specific operation of an operator operating the slave station. 9. The slave station requests the line occupancy at predetermined time intervals set in advance in the slave station, and the latest line occupancy of the latest line occupancy data transmitted from the host computer. 4. The latest line occupancy is displayed on the display unit when the value becomes equal to or smaller than the set line occupancy of the master station preset in the slave station. Wireless LAN system. 10. The slave station requests the line occupancy at predetermined time intervals set in advance in the slave station.
The line occupancy when the latest line occupancy of the latest line occupancy data transmitted from the computer is equal to or greater than the set line occupancy of the master station preset in the slave station. 4. The wireless LAN system according to claim 3, wherein is displayed on the display unit.