JP2000228666A - Radio lan system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio LAN system capable of improving the handleability of a slave station and improving efficiency as the entire system by reporting a system saturated state to the slave station. SOLUTION: In this radio LAN system, a master station 1 manages the number of the slave stations connected inside a service area, judges the state where the number of the slave stations reaches the maximum number of the slave stations connectable to the master station as the system saturated state and periodically reports whether or not it is the system saturated state to the slave station 2 positioned inside the service area. At least, the slave station not connected to the master station among the reported slave stations displays whether or not it is the system saturated state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a TDD (Time Division Duplex) comprising one master station and a plurality of slave stations.
The present invention relates to a wireless LAN using the x) method, and particularly to a wireless LAN system that can notify a slave station when the number of slave stations connected to one master station has reached the maximum number of connectable slave stations. .

[0002]

2. Description of the Related Art First, a general TDD wireless LAN
The system will be described with reference to FIG. FIG. 8 is an explanatory diagram showing a schematic configuration of a general TDD wireless LAN system. A general TDD wireless LAN system includes one master station (CM) 1 and a plurality of slave stations (UM).
The maximum number of slave stations that can be connected in the service area of the master station 1 (the maximum number of management UMs in FIG. 8) is limited (for example, in FIG. 8, the maximum number of management UMs is N). ).

If the maximum number of connectable slave stations (the maximum number of management UMs) is N for one master station 1, a plurality of (m) master stations 1 and a plurality of (n) When a system is constructed from the slave stations 2), the relationship between the numbers of the master station 1 and the slave stations 2 at this time is as follows: n ≦ m × N (Equation 1) Further, assuming that the slave stations 2 in the service area of each master station 1 are equally distributed, the following relationship holds: n / m ≦ N (Equation 2).

That is, the number of slave stations 2 as a whole system is limited by (Equation 1), and the number of slave stations 2 in the service area of one master station 1 must be N or less. As shown in FIG. 8, CM1-1 and CM1
If N slave stations (UM) are connected in the -2 service area, respectively, the (2N + 1) th slave station (UM) is connected.
Cannot be operated in either service area.

[0005] In the conventional wireless LAN system, the slave stations 2 under the control of each master station 1 are registered in advance in accordance with the above operational restrictions, and only the registered slave stations 2 can be connected.

However, in the wireless LAN system, when the slave station 2 can move across the service area by utilizing the feature that the master station 1 and the slave station 2 are wirelessly connected, the service of the specific master station 1 is When a case where the slave stations 2 are concentrated in the area occurs and the mobile station 2 having the maximum number of slave stations exists in the service area of a certain master station 1 due to the movement, the slave station 2 which has moved into the service area thereafter provides the service. The system becomes unusable and cannot be used systematically (this state is called a system saturation state or a system FULL state).

An example in which the mobile station 2 is movable will be described with reference to FIG. FIG. 9 is an explanatory diagram showing an example of the state of the wireless LAN system when the slave station is movable. First, from a state in which eight UMs are connected to each of the service area a under the CM-a and the service area b under the CM-b in which the maximum number of managed UMs is 10, UMb- 1 moves to the service area a (1), and connection becomes possible as the ninth UM in the service area a, and then UMb-2 of the service area b moves to the service area a (2), a
Can be connected as the tenth UM in the above, and at this stage, the CM-a is in the system FULL state.

Next, UMb- in the service area b
8 moves to the service area a (3), but becomes the eleventh UM in the service area a.
Cannot connect because the number of M exceeds.

At this time, if the slave station 2 that has moved to the service area in the system FULL state attempts to connect,
In a conventional wireless LAN system, a connection request is not accepted, and a connection cannot be made.

[0010]

However, in a conventional wireless LAN system, when a slave station that has moved to a service area of a master station that is in a system saturation state attempts to make a connection, it simply becomes unable to connect. Information on the cause, etc. is not reported, and the user of the slave station cannot recognize whether the master station that has moved and tried to connect is in a system saturated state or a device failure, etc., and is inconvenient to use. there were.

In addition, since the timing at which connection is possible cannot be recognized, the connection request must be repeated indiscriminately, the slave station repeats useless operation, and wasteful power consumption is performed. There is a problem that the process of accepting useless connection requests is performed and the efficiency of the entire system is reduced.

The present invention has been made in view of the above circumstances, and solves the problem of the prior art that the slave station cannot recognize the system saturation state and further reduces the efficiency of the entire system. An object of the present invention is to provide a wireless LAN system capable of improving the usability of a slave station and improving the efficiency of the entire system by notifying the slave station of a system saturation state.

[0013]

According to a first aspect of the present invention, in a wireless LAN system, a master station is a slave station of a slave station connected within a service area. Managing the number, the state in which the number of slave stations has reached the maximum number of slave stations connectable to the master station as a system saturation state, and notifies the slave stations that are not connected in the service area, The slave station that has received the notification displays the system saturation state, so that a slave station that is not connected in the service area can recognize the system saturation state.

According to a second aspect of the present invention, in a wireless LAN system, a master station manages the number of slave stations connected in a service area. A state in which the number of slave stations has reached the maximum number of slave stations that can be connected to the master station is determined as a system saturation state, and the slave stations connected in the service area and slave stations not connected are periodically determined. To inform whether or not the system is in a system saturated state, and to display whether or not at least the sub-stations not connected in the service area among the sub-stations that have received the report are in a system-saturated state. It is possible to periodically recognize, at least in the slave stations that are not connected within the service area among the slave stations that have been notified, whether or not the system is saturated.

According to a third aspect of the present invention, there is provided a wireless LAN system which is connected to a slave station management table for storing slave stations connected in a service area. Register a slave station in the slave station management table, and periodically determine whether the number of slave stations registered in the slave station management table has reached a preset maximum number of connectable slave stations. Judgment, the state in which the number of registered slave stations has reached the maximum number of slave stations is regarded as a system saturation state, and whether or not the system is in a saturation state is determined for a slave station located in the service area. A master station having a control unit for notifying, and a control unit that receives a notification from the master station, and controls display according to the content of the notification when not connected to the master station in the service area. According to the content of the notification And a slave unit having a display unit for displaying whether the system is saturated or not, at least in the slave stations that are not connected in the service area, whether the system is saturated or not is periodically determined. Can be recognized.

A fourth aspect of the present invention for solving the problems of the conventional example is a wireless LAN according to the second or third aspect.
In the AN system, a part of a broadcast signal transmitted from the master station to the slave station periodically is assigned as a system FULL flag, and the system FULL flag is used to notify whether or not the system is in a saturated state, Using the existing notification signal, the slave station can recognize in real time whether or not the system is saturated.

The invention according to claim 5 for solving the problem of the above-mentioned conventional example is a wireless LAN according to claim 3 or 4.
In the AN system, when the control unit of the master station receives a radio wave from an arbitrary slave station, the master station refers to the slave station management table, and if the slave station management table is not in a saturated state, the slave station is included in the slave station management table. Registered, for the registered slave station, if it does not receive the radio wave for a specific time, it is characterized by being a control unit that deletes the registration from the slave station management table, captured the fluid connection state of the slave station The slave station can recognize in real time whether or not the system is saturated as described above.

The invention according to claim 6 for solving the problem of the above-mentioned conventional example is according to claim 3 or 4 or 5.
In the wireless LAN system described above, the control unit of the slave station
At the time of receiving the notification that the system is in a saturated state, if the relevant slave station is not registered in the slave station management table, the radio station is in a non-transmission state. It is characterized by the control unit of the slave station that is in the state of 、, when connection is not possible in the system saturation state, the slave station does not transmit unnecessary radio waves to save power consumption, and the master station is also Connection acceptance processing can be avoided.

According to a seventh aspect of the present invention for solving the problems of the above-mentioned conventional example, a wireless LAN according to the fifth or sixth aspect is provided.
In the AN system, the control unit of the master station reports a specific time until the slave station registered in the slave station management table is deleted from the slave station management table since the last time when the radio wave was received from the slave station. The control unit of the master station counting by the number of signals, the control unit of the slave station registered in the slave station management table, the control unit of the specified by the number of notification signals since the last time the radio wave was transmitted to the master station When counting the time and reaching the specific time, the control unit of the slave station that determines that the slave station has been deleted from the slave station management table in the master station is characterized by using an existing broadcast signal. It is possible to match the recognition as to whether or not the slave station is registered in the slave station management table of the master station by simple processing.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the claimed invention will be described with reference to the drawings. In the wireless LAN system according to the present invention, the master station manages the number of slave stations connected in the service area, and the number of slave stations has reached the maximum number of slave stations connectable to the master station. Is determined to be a system saturated state, and whether or not the system is in a saturated state is periodically notified to a slave station located in the service area, and among the slave stations that have been notified, at least a slave station that is not connected to the master station. But,
Displays whether the system is saturated or not, and furthermore, if the slave is not registered in the slave management table in the master when the slave is notified of the system saturation,
When the system is in a radio non-transmission state and receives a notification that the system is not saturated, the system will be in a radio transmission state, so the slave station can recognize whether the system is in a saturated state, improving usability and transmitting unnecessary radio waves. Can be avoided and the efficiency of the entire system can be improved.

First, the configuration of the master station of the wireless LAN system according to the present invention will be described with reference to FIG. FIG. 1 is a configuration block diagram of a master station of the wireless LAN system according to the present invention.

The master station 1 of the present invention includes a control unit 10 for controlling the entire apparatus, a radio unit 20 for performing radio communication with the slave station 2,
It comprises a wired section 21 for performing wired communication with a backbone network, and a storage section 22.

Since the radio section 20 and the wired section 21 in the master station 1 of the present invention perform general wireless communication and wired communication in the same manner as those in the conventional master station, detailed description is omitted. , Control unit 10 related to the characteristic portion of the present invention
And the storage unit 22 will be described.

The storage unit 22 has a slave station management table 22a for storing slave stations connected in the service area. Here, an example of a specific format of the slave station management table 22a will be described with reference to FIG. FIG. 2 is an explanatory diagram showing a format example of the slave station management table 22a in the master station of the present invention.

The slave station management table 22a of the present invention has a format in which a predetermined maximum of N slave stations can be registered, and each record is an identifier for uniquely identifying the slave station. (The slave station number in FIG. 2) and the registration time of the slave station are stored.

The maximum number N of slave stations is a value restricted by the wireless LAN system. The registration time is a value obtained by counting the elapsed time since the last reception of the radio wave from the slave station. When the registration time reaches a predetermined specific time, the slave station is managed by the slave station. Table 22
a.

In the process of repeating registration and deletion in the slave station management table 22a, the state in which N slave stations are registered is the saturation state of the slave station management table 22a, and at the same time, the service of the master station 1 is performed. This means that the number of slave stations connected in the area has reached the maximum number of slave stations that can be connected to the master station, meaning that the system is saturated. still,
A method of registering in the slave station management table 22a, a method of counting registration time, and a method of deleting registration will be described later.

The control unit 10 of the master station 1 according to the present invention controls the wireless communication with the slave station 2 and the wired communication with the backbone network as a general master station 1, and further includes a characteristic part of the present invention. The system FULL state notification control that manages the number of slave stations connected in the service area using the slave station management table 22a, detects a system saturation (FULL) state, and notifies the slave station 2 of it. Is what you do.

Specifically, as means for performing system FULL state notification control, the control unit 10 of the master station 1 of the present invention includes a radio communication control means 11 and a slave station registration monitoring means 12.
And a slave station deletion monitoring means 13 and a system FULL monitoring means 14. Each means will be specifically described.

The wireless communication control means 11 is a means for controlling communication of wireless communication based on the TDD system. Typically,
The wireless communication of the TDD scheme is a scheme in which a master station 1 and a slave station 2 alternately communicate with each other. The slave station 2 operates according to a reference timing of a system transmitted from the master station 1. Normally, a signal indicating the reference timing transmitted from the master station 1 is called a broadcast signal, and is transmitted from the master station 1 to all slave stations 2 located in the service area at regular intervals as shown in FIG. Data communication from the master station 1 to any slave station 2 or from any slave station 2 to the master station 1 in a time zone between the broadcast signals.
And data communication to the Internet. FIG.
FIG. 2 is an explanatory diagram showing exchange of signals in wireless communication of the TDD system.

The slave station registration monitoring means 12 is a means for registering the connected slave station 2 and updating the registration time. Here, a specific processing operation of the slave station registration monitoring means 12 will be described with reference to FIG. FIG. 4 is a flowchart showing the flow of processing in the slave station registration monitoring means 12 of the control unit 10 of the master station 1 according to the present invention.

The processing in the slave station registration monitoring means 12 of the control section 10 of the master station 1 of the present invention always operates, it is determined whether or not the radio wave from the slave station 2 has been received (100). No), the process 100 is repeated, and when the process 100 is received (Y
es) determines whether the slave station 2 is the slave station 2 already registered in the slave station management table 22a (102). If the slave station 2 is already registered (Yes), it corresponds to the slave station 2. The registration time is cleared to 0 (104), and the process returns to 100.

On the other hand, in the process 102, if the slave station 2 is not already registered in the slave station management table 22a,
It is determined whether the slave station management table 22a is saturated (11).
0), if it is saturated (Yes), the process returns to step 100; if it is not saturated (No), the identifier of the child station is newly registered in the child station management table 22a, and the registration time is set to 0. (112), the process returns to the process 100.

The slave station deletion monitoring means 13 is a means for performing processing for deleting a slave station 2 that has not exchanged data for a predetermined time in the slave station 2 registered in the slave station management table 22a.
Here, a specific processing operation of the slave station deletion monitoring means 13 will be described with reference to FIG. FIG. 5 shows the master station 1 of the present invention.
3 is a flowchart showing a flow of processing in a slave station deletion monitoring means 13 of the control unit 10 of FIG.

The processing in the slave station deletion monitoring means 13 of the control unit 10 of the master station 1 of the present invention always operates, and it is determined whether or not it is a timing for transmitting a notification signal (200). Repeats the process 200,
When it is time to transmit a notification signal (Yes)
Adds 1 to the registration time in the slave station management table 22a (202), determines whether the registration time has reached a predetermined specific time (204), and if not, (No)
Returning to the process 200, when the specific time has been reached (Yes)
Deletes the slave station from the slave station management table 22a (206), and returns to the process 200. Steps 202 to 206 are performed for all slave stations registered in the slave station management table 22a.

The system FULL monitoring means 14 is a means for monitoring whether or not the system is saturated (FULL) and notifying the result to all the slave stations 2 located in the service area. Specifically, the system FULL monitoring means 14
Then, it is determined whether or not the slave station management table 22a is full (saturated state) by referring to the slave station management table 22a at each timing before transmitting the notification signal. If the slave station management table 22a is saturated, it is determined that the system is saturated. The system FULL flag provided in a part of the notification signal is turned ON (for example, value 1),
Conversely, if the slave station management table 22a is not in a saturated state, the system is not in a saturated state, and the system FULL flag is set to OFF (for example, a value of 0).

As a result, the notification signal transmitted via the wireless communication control means 11 notifies all the slave stations 2 located in the service area whether or not the system is in the FULL state. In the above description, it is assumed that the slave station management table 22a is saturated, that is, the number of slave stations connected to the slave station has reached a preset maximum number of connectable slave stations. Although it is a method of judging that there is, a separate area for managing the number of connected slave stations is provided separately from the slave station management table 22a, and the system is determined by whether or not the value of the area is the maximum number of slave stations. The saturation state may be determined.

Next, the configuration of the slave station 2 of the wireless LAN system according to the present invention will be described with reference to FIG. FIG. 6 is a configuration block diagram of a slave station of the wireless LAN system according to the present invention.

The slave station 2 of the present invention includes a control unit 30 for controlling the entire apparatus, a wireless unit 31 for performing wireless communication with the master station 1,
System FUL indicating whether or not the system is full
And an L display unit 32.

Since the radio section 31 in the slave station 2 of the present invention performs general wireless communication in the same manner as that in the conventional slave station, a detailed description is omitted, and the radio section 31 is related to the characteristic portions of the present invention. The control unit 30 and the system FULL display unit 32 will be described.

The system FULL display section 32 displays whether or not the master station 1 is in a system saturation (FULL) state. Specifically, for example, an LED or the like can be considered. Then, under the control of the control unit 30, which will be described later, for example, if the system is in the system FULL state, the LED is turned on to call attention to the user.
The LED is turned off. Note that a mark or a character indicating whether or not the system is in the system full state may be displayed on a general display unit such as a display.

The control unit 30 controls the wireless communication with the master station 1 as a general slave station 2 and, as a characteristic part of the present invention, determines whether or not the system is in the system FULL state notified from the master station 1. According to such information, the system FULL state corresponding control corresponding to the information is performed.

More specifically, when a broadcast signal transmitted from the master station 1 at regular intervals is received, ON / OFF of a system FULL flag provided in the broadcast signal is determined, and corresponding to the ON / OFF state. Then, display control of the system FULL display unit 32 and operation switching control of the system are performed.

Here, the operation switching control of the system means that if the system FULL flag is OFF, that is, if the master station 1 is not in the system FULL state, the operation mode is set to the normal operation mode in which radio waves are transmitted and normal operation is performed. . On the other hand, if the system FULL flag is ON, that is, if the master station 1 is in the system FULL state, it is determined whether or not the slave station 2 is registered in the slave station management table 22a of the master station 1; Then, the operation mode is set to the standby mode in which radio waves are not transmitted. Even if the system FULL flag is ON, if the slave station 2 is registered in the slave station management table 22a of the master station 1, the slave station 2 is in the connected state. Remains in the normal operation mode.

Here, the state where the slave station 2 is not registered in the slave station management table 22a of the master station 1 means that the slave station 2 has moved from the service area of the other master station 1;
It is conceivable that, once registered in the slave station management table 22a, the registration is deleted without data exchange for a certain period of time.

Here, a specific processing operation in the control unit 30 of the slave station 2 will be described with reference to FIG. FIG.
Is a slave station registration monitoring means 1 of the control unit 10 of the master station 1 of the present invention.
FIG. 6 is a flowchart showing a flow of processing in the second embodiment.

The control of the system FULL state in the control unit 10 of the master station 1 according to the present invention is started when a broadcast signal from the master station 1 is received, and the system FU included in the broadcast signal is controlled.
It is determined whether the LL flag indicates the FULL state (30).
0), if not in FULL state (No), system FU
The display of the LL display unit 32 is turned off (302), the operation mode is set to the normal operation mode (304), and the normal wireless L
The operation shifts to the operation flow of the AN.

On the other hand, in the process 300, the system FU
If the LL flag is in the FULL state (Yes), it is determined whether the LL flag is registered in the slave station management table 22a of the master station (3).
10) If it is registered (Yes), it is currently connected and the process proceeds to processing 302; if it is not registered (No),
Since the connection is not established, the display on the system full display section 32 is set to O.
N (312), the operation mode is set to the standby mode (314), and the processing of the system FULL state corresponding control is ended.

Next, the operation of the wireless LAN system of the present invention will be described with reference to FIGS. In the wireless LAN system of the present invention, when a new slave station 2 transmits a radio wave in the service area of the master station 1, the radio wave is transmitted via the radio section 20 of the master station 1 and the radio communication control means 11 of the control section 10. Is checked by the operation of the slave station registration monitoring means 12 to determine whether the slave station management table 22a is saturated. If not, the slave station 2 is registered in the slave station management table 22a, and thereafter the parent station is registered. Communication between the station 1 and the slave station 2 is performed.

In the master station 1, the slave station deletion monitoring means 13
In the operation of the slave station 2, the time from when the slave station 2 is registered in the slave station management table 22a is counted by the number of notification signals transmitted from the master station 1 to the slave station 2 at regular time intervals, and the slave station is registered as the registration time. The child station is stored in the management table 22a, and when the registration time reaches a predetermined time, the slave station is deleted from the slave station management table 22a.

However, in the master station 1, the slave station registration monitoring means 12
As an operation of the above, when the radio wave of the slave station 2 already registered in the slave station management table 22a is received, the registration time corresponding to the slave station 2 in the slave station management table 22a is cleared. The time counts the time since the last reception of the radio wave from the slave station 2, and finally counts the slave station 2
The registration is deleted for the slave station 2 for which the specific time has elapsed since the reception of the radio wave.

Further, in the master station 1, the operation of the system FULL monitoring means 14 refers to the slave station management table 22a at each timing before transmitting the notification signal, and determines whether the slave station management table 22a is saturated. If the slave station management table 22a is saturated, the system FULL flag provided in a part of the broadcast signal is turned ON, and if the slave station management table 22a is not saturated, the system FULL is turned off.
The L flag is set to OFF, and the wireless communication control unit 1
A notification signal is transmitted to all slave stations 2 located in the service area via the wireless communication unit 1 and the radio unit 20.

On the other hand, the slave station 2 counts the number of broadcast signals since the last exchange with the master station 1 in order to manage whether or not the slave station 2 is registered in the slave station management table 22a of the master station 1. If the count reaches the same specific time as that of the master station 1, it is determined that the slave station has been deleted from the slave station management table 22a of the master station 1.

Then, in the slave station 2 which has received the notification signal,
As an operation of the control unit 10, the system FULL flag in the broadcast signal is checked each time a signal is received, and if the system FULL flag is ON, the system is considered to be in a saturated state, and the control unit 10 determines from the count of the broadcast signal described above that 1
It is determined whether or not it is registered in the slave station management table 22a and is in the connected state. If it is not in the connected state because it is not registered in the slave station management table 22a, the display of the system FULL display unit 32 is turned on, and the operation is started. The mode is also a standby mode in which radio waves are not transmitted.

Further, the system FUL of the received notification signal
Even if the L flag is ON, if the device itself is registered in the slave station management table 22a of the master station 1 and is in the connected state, the display of the system FULL display section 32 is turned OFF, and the operation mode is also to transmit radio waves. The operation mode is set.

On the other hand, the system FUL of the received notification signal
If the L flag is OFF, it is determined that the system is not saturated, the display of the system FULL display unit 32 is turned OFF, and the operation mode is set to the normal operation mode for transmitting radio waves.

The system FULL of the received notification signal
When the flag is ON, if the user is registered in the slave station management table 22a of the master station 1 and is in the connected state, the display of the system FULL display section 32 is turned ON, and the user of the slave station 2 being connected is notified. The fact that the service area is congested may be notified.

The function realizing means described in the present embodiment may be realized by software processing using a program, or may be partially or entirely realized by hardware. The counting of the specific time in the master station 1 and the slave station 2 is realized by the control unit 10 and the control unit 30.
It may be realized by a hardware counter using a timer or the like.

In the above description, the control under one master station 1 has been described. However, when the slave station 2 is located in the overlapping area of the service areas of the plurality of master stations 1, the plurality of master stations 1 Between the master station 1 which can detect that the system is not saturated at first by monitoring the system FULL flag included in each of the broadcast signals with a time lag. , And when all are saturated, display of the system FULL and change to the standby mode may be performed.

According to the wireless LAN system according to the embodiment of the present invention, the master station 1 manages the number of slave stations connected to each other in the service area in the slave station management table 22a. A state in which the number has reached the maximum number of slave stations is defined as a system saturation state, and the slave station 2 that is located in the service area is periodically notified to determine whether the notified slave station 2 is in a system saturation state. Since the display indicates whether or not the system is saturated, the slave station 2 can periodically recognize whether or not the system is saturated. After recognizing the reason why the connection cannot be established, it is possible to reconnect when the system is no longer saturated. In this case, there is an effect that the uselessness of the slave station 2 can be improved by reducing the useless time of the user station, eliminating the fear that the reason why the connection cannot be established cannot be understood.

Further, since the notification of the system saturation state from the master station 1 to the slave station 2 is periodically performed by using a part of the notification signal transmitted from the master station 1 to the slave station 2, the existing broadcast signal is notified. There is an effect that the slave station side can recognize in real time whether or not the system is in a saturated state by using.

When the control unit 10 of the master station 1 receives a radio wave from an arbitrary slave station 2, the control unit 10 refers to the slave station management table 22a and registers the slave station 2 in the slave station management table 22a unless it is saturated. If no radio wave is received for a specific period of time for the registered slave station 2, the registration is deleted from the slave station management table 22a. This has the effect of allowing the slave station 2 to recognize the system saturation state in real time.

Further, when the control unit 30 of the slave station 2 receives the notification that the system is saturated, if the slave station 2 is not registered in the slave station management table 22a in the master station 1, the radio wave Is not transmitted, and when a notification that the system is not in a saturated state is received, a radio wave is transmitted. Therefore, when connection is impossible in the system saturated state, the slave station 2 does not transmit unnecessary radio waves to save power consumption. However, even in the master station 1, useless connection reception processing can be avoided, and there is an effect that the efficiency of the system can be improved.

The specific time until the control unit 10 of the master station 1 deletes the slave station 2 registered in the slave station management table 22a is a notification signal from the last reception of the radio wave from the slave station 2. The control unit 30 of the slave station 2 registered in the slave station management table 22a counts the specific time by the number of notification signals since the last transmission of the radio wave to the master station 1, and specifies When the time has passed, the master station 1 determines that the slave station 2 has been deleted from the slave station management table 22a. Therefore, the slave station 2 is registered in the slave station management table 22a of the master station 1 by a simple process using an existing broadcast signal. There is an effect that the recognition of whether or not it is possible can be matched.

[0065]

According to the first aspect of the present invention, the master station comprises:
The number of slave stations connected in the service area is managed, and the state where the number of slave stations has reached the maximum number of slave stations that can be connected to the master station is regarded as a system saturation state, and the number of slave stations connected in the service area is determined. Because a wireless LAN system that notifies a slave station that is not connected and receives the notification and indicates the system saturation state is used, the reason why a slave station that is not connected in the service area cannot be connected is the system saturation state. Thus, there is an effect that the usability in the slave station can be improved.

According to the second aspect of the present invention, the master station manages the number of slave stations connected in the service area, and the number of slave stations becomes the maximum number of slave stations connectable to the master station. The reached state is determined to be the system saturation state, and the connected station and the unconnected station in the service area are periodically notified of whether the system is saturated or not, and the notification is performed. Among the received slave stations, at least a slave station that is not connected in the service area is a wireless LAN system that indicates whether the system is in a saturated state. It is possible to periodically recognize whether or not the system is saturated, recognize the reason why the connection is not possible, and reconnect when the system is no longer saturated, improving the usability in the slave station. A.

According to the third aspect of the present invention, the control unit of the master station registers the slave stations connected in the service area in the slave station management table, and registers the slave stations registered in the slave station management table. Periodically determine whether the number of slave stations has reached the preset maximum number of connectable slave stations, and determine whether the number of registered slave stations has reached the maximum number of slave stations. As the system saturation state, it is notified to the slave station located in the service area whether or not the system is in a saturation state, and the control unit of the slave station receives the notification from the master station and connects to the master station in the service area. If not, the wireless LAN system displays on the display unit whether the system is saturated according to the contents. Therefore, it is necessary to periodically determine whether the system is saturated at least in the slave stations that are not connected in the service area. Can be recognized It can be re-connected when it is no longer in the system saturation In recognition of why it can not connect, there is an effect capable of improving the usability of the slave station.

According to the fourth aspect of the present invention, a part of the broadcast signal periodically transmitted from the master station to the slave station is transmitted to the system FU.
The wireless LAN system according to claim 2 or 3, wherein the wireless LAN system is assigned as an LL flag and notifies whether or not the system is saturated using a system FULL flag. Can be recognized in real time on the slave station side, it is also possible to capture the timing when the system is no longer saturated and reconnect,
There is an effect that the usability in the slave station can be improved.

According to the fifth aspect of the present invention, when the control unit of the master station receives a radio wave from an arbitrary slave station, the control unit refers to the slave station management table and, if not saturated, sets the slave station to the slave station management table. The wireless LAN device according to claim 3 or 4, wherein the registered slave station deletes the registration from the slave station management table if no radio wave is received for a specific time. There is an effect that the slave station can recognize the system saturation state in real time after capturing the connection status.

According to the sixth aspect of the present invention, when the control unit of the slave station receives the notification that the system is in a saturated state, the master station does not register the slave station in the slave station management table. For example, when the wireless LAN system is set in a radio wave non-transmission state and receives a notification that the system is not in a saturated state, the radio LAN system is set in a radio wave transmission state. When it is not possible, the slave station does not transmit unnecessary radio waves to save power, and the master station can also avoid unnecessary connection acceptance processing, thereby improving the system efficiency.

According to the seventh aspect of the present invention, the control unit of the master station sets the specific time until the slave station registered in the slave station management table is deleted from the time when the radio wave was last received from the slave station. And the control unit of the slave station registered in the slave station management table counts the specific time by the number of notification signals since the last transmission of the radio wave to the master station. 7. The wireless LAN according to claim 5, wherein it is determined that the master station has been deleted from the slave station management table when the number reaches the maximum.
Since the system is used, there is an effect that recognition of whether or not the slave station is registered in the slave station management table of the master station can be made to coincide by simple processing using an existing notification signal.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a master station of a wireless LAN system according to the present invention.

FIG. 2 is an explanatory diagram showing a format example of a slave station management table in a master station according to the present invention.

FIG. 3 is an explanatory diagram showing signal exchange in TDD wireless communication.

FIG. 4 is a flowchart showing a flow of processing in a slave station registration monitoring means of the control section of the master station according to the present invention.

FIG. 5 is a flowchart showing a processing flow in a slave station deletion monitoring means of the control unit of the master station according to the present invention.

FIG. 6 is a configuration block diagram of a slave station of the wireless LAN system according to the present invention.

FIG. 7 is a flowchart showing a processing flow in a slave station registration monitoring means of the control section of the master station according to the present invention.

FIG. 8 is an explanatory diagram showing a schematic configuration of a general TDD wireless LAN system.

FIG. 9 is an explanatory diagram showing an example of the state of the wireless LAN system when the slave station is movable.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... master station, 2 ... slave station, 10 ... control part, 11 ... wireless communication control means, 12 ... slave station registration monitoring means, 13 ... slave station deletion monitoring means, 14 ... system FULL monitoring means,
20: wireless unit, 21: wired unit, 22: storage unit,
22a: slave station management table, 30: control unit, 31 ...
Radio section 32 System FULL display section

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shunji Miura 3-19-2 Nishi Shinjuku, Shinjuku-ku, Tokyo Inside Japan Telegraph and Telephone Corporation (72) Inventor Yoshifumi Suzuki 3-192 Nishi Shinjuku, Shinjuku-ku, Tokyo No. Nippon Telegraph and Telephone Corporation F-term (reference)

Claims (7)

[Claims] 1. A system in which a master station manages the number of slave stations connected in a service area and the number of slave stations reaches the maximum number of slave stations connectable to the master station. A wireless LAN system in which a saturated state is notified to a slave station that is not connected in the service area, and the notified slave station displays a system saturation state. 2. A system in which a master station manages the number of slave stations connected in a service area and the number of slave stations reaches a maximum number of slave stations connectable to the master station. Judgment as a saturated state, periodically notifies the connected slave station and the unconnected slave station in the service area whether or not the system is in a saturated state. A wireless LAN system for displaying whether or not at least a slave station that is not connected in the service area is in a system saturation state. 3. A slave station management table for storing the slave stations connected in the service area, and the connected slave stations are registered in the slave station management table, and are registered in the slave station management table. Periodically determine whether the number of slave stations of the slave station has reached the preset maximum number of connectable slave stations,
A control in which the state in which the number of registered slave stations has reached the maximum number of slave stations is regarded as a system saturation state, and whether the system is in a system saturation state is notified to a slave station located in the service area. A control unit that receives a notification from the master station and performs display control according to the content of the notification when not connected to the master station in the service area; and A wireless LAN system comprising: a display unit for displaying whether or not the system is saturated according to the content. 4. A part of a broadcast signal periodically transmitted from a master station to a slave station is assigned as a system FULL flag,
4. The wireless LAN system according to claim 2, wherein the system FULL flag is used to notify whether or not the system is saturated. 5. When the control unit of the master station receives a radio wave from any slave station, the control unit of the master station refers to the slave station management table, and if the slave station management table is not saturated, the slave station management table includes the slave station management table. 5. The wireless LAN according to claim 3, wherein the control unit is configured to register the slave station and delete the registration from the slave station management table if a radio wave is not received for a specific time for the registered slave station. apparatus. 6. When the control unit of the slave station receives a notification that the system is saturated, if the master station does not register the slave station in the slave station management table, a radio wave non-transmission state is set. 6. The wireless LAN system according to claim 3, wherein the wireless LAN system is a control unit of a slave station which is in a state of radio wave transmission when receiving a notification that the system is not in a system saturation state. 7. A specific time until the control unit of the master station deletes a slave station registered in the slave station management table from the slave station management table from the time when the last radio wave is received from the slave station. The control unit of the master station counting by the number of broadcast signals, the control unit of the slave station registered in the slave station management table, the number of broadcast signals from the last transmission of radio waves to the master station, When the specific time is counted and reaches the specific time,
7. The wireless LAN system according to claim 5, wherein the master station is a control unit of the slave station that determines that the slave station has been deleted from the slave station management table.