JP2001086549A - Wireless communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently inform a master station unit being a moving source about identification information in a wireless communication system where each master station unit manages identification information of each mobile station unit resident in the master station's communication available area. SOLUTION: A reception means 11 of a mobile station unit 2a receives identification information from a transmitter means 23 of each of master station units 1a-1c and a management means 12 of the unit 2a manages identification information of the master station unit. A reception means 21 of the master station unit receives the identification information from a transmission means 13 of the mobile station unit, and a management means 22 of the master station manages the identification information of the mobile station unit. A transmission means 14 of the mobile station unit transmits, e.g. its identification information and identification information of a master station unit being a moving source to a master station unit of a moving destination, a notice means 24 of the master station unit of the moving destination transmits the identification information of the mobile station unit to the master station unit of the moving source via a channel and a delete means 25 of the master station unit of the moving source deletes the identification information from a management object by the management means 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a plurality of master stations and a mobile station which moves in a communicable area of the plurality of master stations, wherein each master station has a mobile station in its own communicable area. The present invention relates to a wireless communication system such as a wireless LAN system for managing identification information of a station device, and particularly, when a mobile station device moves in a communicable area of a plurality of parent station devices, the identification information of the mobile station device is changed to a parent parent device. The present invention relates to a wireless communication system that efficiently notifies a station device.

[0002]

2. Description of the Related Art In a wireless LAN system, for example, a plurality of master stations (for example, fixed stations) used as access points are separated from a wired LAN by a distance.
And the like, and each master station device is connected to a mobile station device (eg, mobile station) scattered in its own communicable area (eg, basic service area: BSA). 2. Description of the Related Art Communication of information via a wireless line is performed. Here, different wireless media (operating frequencies) are assigned to the adjacent master station devices, respectively, thereby preventing radio interference between a plurality of master station devices having overlapping portions in the communicable area. I have.

[0003] Further, since a mobile station device can move in a communicable area of a plurality of master station devices, each master station device manages identification information of a mobile station device in its own communicable region. The authentication of the mobile station device and the communication with the mobile station device are performed based on the identification information.

[0004] As an example, when a master station device receives a signal addressed to a mobile station device via a wired line, for example,
It determines whether or not it manages the identification information of the mobile station device that is the destination of the signal, and if it manages it, wirelessly transmits the signal to its own communicable area. For this reason,
For example, when a mobile station device moves from the communicable area of one master station apparatus to the communicable area of another master station apparatus, the mobile station apparatus (i.e., the one master station apparatus) of the movement source is referred to as the mobile station apparatus. Unless the identification information is deleted from the management target, a useless signal is wirelessly transmitted to the mobile station device.

Therefore, conventionally, when a mobile station device moves in the communicable area of the master station device, the destination master station device (that is, the other master station device) newly registers with the new mobile station device. A configuration has been studied in which the identification information is notified to all other master stations in the network. When such notification is performed, the identification information of the mobile station device that has moved from its own communicable area to the communicable area of another master station device is deleted from the management target at the source master station device based on the notification content. As a result, it is possible to prevent useless wireless transmission from being performed to the mobile station apparatus and prevent a decrease in information communication throughput in a wireless section.

[0006]

However, in the above-described wireless LAN system, as described above, the destination master station device newly registers the identification information of the mobile station device that has moved to its own communicable area. In doing so, the identification information has to be reported to all other master stations in the network, so that a large number of signals (for example, IP frames) for performing the notification are sent to the lines connecting the master stations. There is a problem that the transmission is uselessly performed, the traffic volume of the line becomes extremely large, and the communication efficiency becomes extremely poor. In addition, in the management of the movement of the mobile station device (BSA movement management), since all of the management is performed on the master station device side, the load on the master station device side becomes extremely large.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and when a mobile station device moves through a communicable area of a plurality of master station devices, identification information of the mobile station device is moved. An object of the present invention is to provide a wireless communication system such as a wireless LAN system capable of efficiently notifying an original master station device.

[0008]

In order to achieve the above object, in a wireless communication system according to the present invention, a plurality of master stations connected via a line and a communicable area of the master stations are defined. A mobile station device that moves, and each master station device manages identification information of the mobile station device existing in its own communicable area and wirelessly communicates with the mobile station device. Manage the move. That is,
First, in the master station device, the master station management means manages the identification information of the mobile station device existing in its own communicable area, while in the mobile station device, the mobile station management means manages the master station device in the communicable area in which it exists. Manages the identification information.

In this case, for example, when the mobile station apparatus moves from the communicable area of one master station apparatus to the communicable area of another master station apparatus, the mobile station receiving means of the mobile station apparatus changes the master station apparatus of the movement destination. , The identification information of the master station device is wirelessly received, whereby the management target by the mobile station management means is updated to the identification information. At the same time, in the mobile station apparatus, the mobile station identification information transmitting means wirelessly transmits its own identification information to the destination parent station apparatus, and the source parent station identification information transmitting means transmits the identification information to the destination parent station apparatus. To wirelessly transmit the identification information of the source master station apparatus. The above-mentioned identification information of the destination master station apparatus is wirelessly transmitted to the mobile station apparatus by the master station identification information transmitting means of the destination master station apparatus.

On the other hand, in the destination master station apparatus, the master station receiving means wirelessly receives the identification information of the mobile station apparatus from the above-mentioned mobile station apparatus, whereby the identification information is obtained by the master station management means. Registered as a management target. At the same time, at the destination master station device, the notifying means wirelessly receives the identification information of the source master station device of the mobile station device wirelessly received from the mobile station device (that is, the master station device of the movement source). ) Is transmitted via the line with the identification information of the mobile station apparatus. Then, in the source master station device, the deletion means transmits the identification information of the mobile station device received from another master station device (that is, the above-mentioned destination master station device) via the line to the master station management means. Delete from the management target by.

Accordingly, since the identification information of the source master station device is wirelessly transmitted from the mobile station device to the destination master station device as described above, for example, the identification information is transmitted only to the source master station device. Can be transmitted from the destination master station device to the source master station device via a line. For this reason, for example, since it is not necessary for the parent station device of the movement destination to notify the identification information of the mobile station device to all other parent station devices in the network as in the related art, the mobile station device The process of notifying the identification information to the parent station device of the movement source can be made more efficient, whereby the traffic volume of the line can be reduced and the communication efficiency can be improved.

The method of notifying the identification information of the mobile station device to the source master station device is, in short, that the mobile station device identifies the identification information of the source master station device with respect to the destination master station device. Wirelessly, and the destination master station device transmits the identification information of the mobile station device to the master station device corresponding to the identification information (that is, the source master station device). Ways may be used.

As an example, the mobile station device wirelessly transmits a signal containing its own identification information to the destination master station device as a signal addressed to the source master station device, and the destination master station device transmits the signal. Is relayed to the destination master station apparatus, which is the destination, via a line. Further, as another example, the mobile station device wirelessly transmits its own identification information and the identification information of the movement source master station device to the movement destination master station device by separate signals, and the movement destination master station device moves. A notification that the identification information of the mobile station device received from the mobile station device is transmitted to the master station device corresponding to the identification information of the movement source master station device received from the station device (ie, the movement source master station device). Ways can also be used.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment according to the present invention will be described with reference to the drawings. In this example, a case is shown in which the wireless communication system according to the present invention is applied to a wireless LAN system. FIG. 1 shows, as an example of a device constituting a wireless LAN system to which the present invention is applied, a plurality of master stations 1a to 1c connected via a line B and a plurality of master stations 1a to 1c.
A plurality of mobile station devices 2a to 2f capable of moving in the communicable areas A1 to A3 of a to 1c and a plurality of information processing devices 3a and 3b connected to the line B are shown.

Here, each of the master station devices 1a to 1c is, for example, a fixed station of a wireless LAN system, each of the mobile station devices 2a to 2f is, for example, a mobile station of a wireless LAN system, and each of the information processing devices 3a, 3b is For example, it is composed of a personal computer (PC). In addition, for example, a wireless line can be used as the line B, but in this example, a wired line (for example, a backbone) using a wired LAN is used as the line B, for example.

In FIG. 1, each of the master stations 1a to 1
The communicable areas A1 to A3 of c are indicated by dotted lines, and these communicable areas A1 to A3 are, for example, the master stations 1a to 1a.
1c is a basic service area. Further, in this example, different wireless media (operating frequencies fa to fc) are assigned to the respective adjacent master stations 1a to 1c, thereby preventing radio interference between a plurality of master stations. are doing.

FIG. 1 shows three master stations 1a as an example of a device constituting the wireless LAN system of the present embodiment.
1 to 6c, six mobile station devices 2a to 2f, and two information processing devices 3a and 3b.
It is a part of a large number of devices provided in the system. For example, the master station devices 1a to 1c shown in the figure are connected to a master station device (not shown) via a line B. There are other mobile station devices other than the mobile station devices 2a to 2f shown in FIG.
In addition to b, there is an information processing device (not shown) connected to the line B.

The mobile station devices 2a to 2a of the present embodiment shown in FIG.
An example of the configuration of 2f and an example of the configuration of the master stations 1a to 1c of this example are shown. In this example, since the configurations and operations of the mobile station devices 2a to 2f are the same and the configurations and operations of the master station devices 1a to 1c are the same, the mobile station device 2a and the master station device 1a are used here. Representative examples of these configurations will be shown. First,
2 shows a configuration example of a mobile station device 2a of the present example. As shown in FIG. 1, the mobile station device 2a of the present embodiment includes a mobile station receiving means 11, a mobile station managing means 12, a mobile station identification information transmitting means 13, and a source base station identification information transmitting means. 14 are provided.

For example, when the mobile station device 2a moves through the communicable areas A1 to A3 of the master station devices 1a to 1c, the mobile station receiving means 11 sends the master station device 1a from the destination master station device 1a to 1c. 1c is wirelessly received. Here, in the present example, a unique IP address is assigned to each of the master station devices 1a to 1c, and the IP address is used as identification information of the master station devices 1a to 1c. In addition, the mobile station receiving means 11 of the present example comprises:
A transmission permission signal 61 shown in FIG.
By wirelessly receiving the IP addresses of the parent station devices 1a to 1c included in the transmission permission signal 61, the wireless communication device receives the IP addresses of the parent station devices 1a to 1c wirelessly.

When the mobile station apparatus 2a is started, for example, the mobile station apparatus 2a normally establishes synchronization with the master station apparatuses 1a to 1c which can communicate with the mobile station apparatus 2a immediately after the start, and establishes synchronization with the master station apparatuses 1a to 1c. In the mobile station apparatus 2a of this example, the mobile station apparatuses 2a of this example can also communicate with the master station apparatuses 1a to 1c that can communicate immediately after the startup. The same processing as the processing performed between is performed. The same applies to the following.

The mobile station management means 12 has its own (mobile station apparatus 2
Master station devices 1a to 1a to communicable areas A1 to A3 in which a) exists
It has a function of managing the identification information (IP address) 1c. Here, in this example, the mobile station device 2a is provided with a non-volatile memory, and the mobile station management means 12 manages the IP addresses of the parent station devices 1a to 1c by storing them in the memory. In this example, it is assumed that only the latest one IP address is always stored in the memory. For example, when storing the IP addresses of the destination parent station devices 1a to 1c in the memory, the originating parent station is stored. Apparatus 1a-1
If the IP address of c is stored in the memory, the old IP address (of the source master station device 1a-1c) is erased and a new IP address (of the destination master station device 1a-1c) is deleted.
The IP address is overwritten and saved.

The mobile station identification information transmitting means 13 is provided, for example, so that the mobile station device 2a can communicate with the master station devices 1a to 1c.
ＡA3, it has a function of wirelessly transmitting its own (mobile station apparatus 2a) identification information to the destination master station apparatuses 1a to 1c. Here, in this example, a unique MAC address is assigned to each of the mobile station devices 2a to 2f, and the MAC address is assigned to each of the mobile station devices 2a to 2f.
2f is used as identification information.

The mobile station identification information transmitting means 13 of this embodiment
Is detected again when the mobile station device 2a and the master station devices 1a to 1c are out of synchronization.
1c to establish a synchronization with the master station device 1 (for example, a movement destination) which was able to establish the synchronization.
The transmission request signal 31 shown in FIG. 2 is wirelessly transmitted to each of the mobile stations a to 1c to notify the master station apparatus 1a to 1c of its own (mobile station apparatus 2a) MAC address included in the transmission request signal 31. I do.

FIG. 2 shows an example of a transmission request signal 31 wirelessly transmitted from the mobile station device 2a to the master station devices 1a to 1c.
Requests the master stations 1a to 1c to manage and register themselves (mobile stations 2a) by notifying the master stations 1a to 1c of their own (mobile station 2a) MAC addresses as described above. (Authentication request)
For example, from the self (mobile station device 2a) to the master station devices 1a to 1c
This is also used when requesting the parent station devices 1a to 1c to allocate a transmission slot of a radio frame (transmission request) when transmitting information to the base station.

More specifically, the transmission request signal 31 of the present embodiment shown in FIG. 2 includes a bit synchronization signal for establishing bit synchronization, a frame synchronization signal for establishing frame synchronization, and a transmission source signal. A MAC address of the mobile station device 2a (own MAC address), a frame sequence number (frame sequence number), an identifier (mobile station identifier) assigned to the transmission source mobile station device 2a,
It is composed of a radio frame including various control information and a frame check sequence (FCS) for detecting a transmission error.

Here, the above-mentioned mobile station identifier is used by the parent station devices 1a to 1c when the parent station devices 1a to 1c manage the mobile station device 2a.
a, for example, the mobile station device 2
Each time a moves in the communicable areas A1 to A3 of the master station devices 1a to 1c, it is newly assigned by the destination master station device 1a to 1c. Further, in this example, when the transmission request signal 31 is used to make the transmission request, the mobile station identifier used is the identifier assigned to the source mobile station device 2a,
When the above-mentioned transmission request signal 31 is used to make the authentication request, information (ALL “0”) composed of all “0” is used as the mobile station identifier.

For example, when the mobile station device 2a moves in the communicable areas A1 to A3 of the master station devices 1a to 1c, the source master station identification information transmitting means 14 transmits the information to the destination master station devices 1a to 1c.
c, the identification information (I
(P address) by wireless transmission. Here, the source parent station identification information transmitting means 14 of the present example is shown in FIG. 3 in response to receiving a transmission permission signal 61 shown in FIG. 5 described later from the destination parent station apparatuses 1a to 1c. U
The DP frame 41 is wirelessly transmitted to the master stations 1a to 1c. At this time, the IP address of the master station 1a to 1c of the movement source is used as information for specifying the destination of the UDP frame 41. Master station devices 1a to 1
Wireless transmission to c.

In FIG. 3, the mobile station apparatus 2a receives the source master station apparatuses 1a to 1c via the destination master station apparatuses 1a to 1c.
1c shows an example of a UDP frame 41 transmitted to the mobile station device 2c.
a) is a communicable area A1 of the master stations 1a to 1c of the movement origins;
A3 is a signal for notifying the source master stations 1a to 1c that they have moved from A1 to A3 to the communicable areas A1 to A3 of the other (destination) master stations 1a to 1c.

More specifically, the UD of the present embodiment shown in FIG.
The P frame 41 is, for example, an SNMP (Simple Network M) which is a standard network management protocol of the Internet.
P indicating the SET operation of the anagement protocol
PDU (Protocol Data Unit), and this PDU has its own (mobile station apparatus 2a) as a master station apparatus 1a-1.
request identification indicating that the mobile station has moved the communicable areas A1 to A3 (BSA movement notification), information for error control (error status, error position number), and self (mobile station apparatus 2a). Own MAC address (mobile station MAC address: management information # 1)
And the IP addresses of the destination master stations 1a to 1c for identifying the destination master stations 1a to 1c (movement destination fixed station IP addresses: management information # 2).

As described above, the UDP frame 41
Contains the I of the source master station devices 1a to 1c as destination information.
The P address is added. In addition, the IP addresses of the parent station devices 1a to 1c of the movement source added as the destination information are specified by referring to, for example, the IP address stored in the nonvolatile memory provided in the mobile station device 2a. In this case, for example, the source master station devices 1a to 1m stored in the memory
After setting the IP address of the base station 1c as the destination information, the IP address may be rewritten to the IP address of the destination base station apparatus 1a-1c, or for example, the source base station apparatuses 1a-1c stored in the memory. Is rewritten to the IP address of the parent station device 1a to 1c of the destination, the IP address of the parent station device 1a to 1c of the source is stored in another memory, and the IP address stored in the other memory is stored. The address may be set as the destination information.

Next, an example of the configuration of the master station device 1a of this embodiment will be described. As shown in FIG. 1, the master station device 1a of this example includes a master station receiving means 21, a master station management means 22, a master station identification information transmitting means 23, a notifying means 24, and a deleting means 25.
And a movement history storage means 26.

The master station receiving means 21 includes, for example, the mobile station apparatus 2
When the mobile stations a to 2f move from the communicable area A1 of another master station apparatus (such as the master station apparatus 1b) to the communicable area A1 of the master station apparatus 1a, the mobile station apparatuses 2a to 2f transfer the mobile station. It has a function of wirelessly receiving identification information (MAC addresses) of the devices 2a to 2f. Here, the master station receiving means 21 of the present example wirelessly receives the transmission request signal 31 shown in FIG. 2 from the mobile station devices 2a to 2f, and thereby the mobile station device 2a included in the transmission request signal 31 ~ 2f MA
The C address is wirelessly received.

The master station management means 22 is self (master station device 1a).
Has a function of managing identification information (MAC addresses) of the mobile station devices 2a to 2f existing in the communicable area A1. Here, the master station management unit 22 of the present example uses the mobile station management table 51 shown in FIG.
The mobile station devices 2a to 2f existing in the communicable area A1 of a)
The mobile station identifiers assigned to the mobile stations (eg, “mobile station # 1” to “mobile station #n”) and the MAC addresses of the mobile station apparatuses 2a to 2f are managed in association with each other. The mobile station management table 51 is stored in a memory provided in the master station device 1a.

The master station identification information transmitting means 23 transmits, for example, the mobile station apparatuses 2a to 2f from the communicable area of another master station apparatus (such as the master station apparatus 1b) to the communicable area A2 of the own (master station apparatus 1a). When it moves, it has a function of wirelessly transmitting its own (master station device 1a) identification information (IP address) to the mobile station devices 2a to 2f. Here, in response to receiving the transmission request signal 31 shown in FIG. 2 from the mobile station devices 2a to 2f, the master station identification information transmitting means 23 of the present example transmits the transmission permission signal 61 shown in FIG. By performing radio transmission to the mobile station devices 2a to 2f, the mobile station devices 2a to 2f are notified of their own (master station device 1a) IP address included in the transmission permission signal 61.

FIG. 5 shows an example of the transmission permission signal 61 wirelessly transmitted from the master station device 1a to the mobile station devices 2a to 2f. Specifically, the transmission permission signal 61 shown in the figure includes a bit synchronization signal for establishing bit synchronization, a frame synchronization signal for establishing frame synchronization, and a MAC address of the master station device 1a as a transmission source. (Own station MAC address), frame sequence number (frame sequence number), mobile station identifier (permitted mobile station identifier) assigned to destination mobile station devices 2a to 2f, and destination mobile station device 2a To 2f (allowed mobile station MAC address), the IP address of the master station device 1a (self-station IP address), various control information, and a frame check sequence (F for detecting a transmission error).
CS).

The notifying means 24 includes, for example, the mobile station devices 2a to 2a.
When the mobile station 2f moves from the communicable area of another master station apparatus (such as the master station apparatus 1b) to the communicable area A1 of its own (master station apparatus 1a), the mobile station 2a to 2f wirelessly receives the movement. The identification information (MAC address) of the mobile station devices 2a to 2f to the master station device (that is, the migration source master station device) corresponding to the identification information (IP address) of the migration source master station device of each of the station devices 2a to 2f. Is transmitted via the line B. Here, when the UDP frame 41 shown in FIG. 3 is wirelessly received from the mobile station devices 2a to 2f, the notifying unit 24 of the present example transmits the UDP frame 41 to the destination master station device (parent device) that is the destination. The MAC address of the mobile station device 2a to 2f included in the UDP frame 41 is notified to the source master station device by transmitting the MAC address to the master station device by transmitting the MAC address to the mobile station device 1b). Note that the UDP frame 41 of this example is processed in the IP layer of the master station device 1a.

The deleting means 25 receives, for example, the mobile station apparatus 2 received from another master station apparatus (master station apparatus 1b or the like) via the line B.
It has a function of deleting the identification information (MAC addresses) a to 2f from the management target by the master station management means 22. Here, the deletion unit 25 of the present example is the UDP unit shown in FIG.
When the frame 41 is received from another master station device (such as the master station device 1b), the mobile station device 2a corresponding to the mobile station MAC address included in the UDP frame 41
２2f are assumed to have moved from the communicable area A1 of their own (master station apparatus 1a) to the communicable area of another master station apparatus, and the MAC address and the corresponding mobile station identifier are shown in FIG. Mobile station management table 5
Delete from 1.

The movement history storage means 26 has, for example, a function of storing BSA movement history information of the mobile station devices 2a to 2f managed by itself (the master station device 1a) and the mobile station devices 2a to 2f managed by the master device 1a. Have. Here, as shown in FIG. 6, for example, the movement history
The movement history information is stored on the extended MIB database as a table for each MAC address of the mobile station devices 2a to 2f.

More specifically, in this example, an item “mobile station BSA movement history” is provided below the item “mobile station status”, and the MAC address (“mobile”) of each of the mobile station devices 2a to 2f is provided. Station 1 MAC address "), etc.
IP of the master station device (master station device 1b, etc.) to which 2f has moved
The address is stored as history information (for example, “mobile station movement history 1” to “mobile station movement history m”). In this example, every time the UDP frame 41 is received from another master station device (such as the master station device 1b), the IP address (moving destination master station) included in the UDP frame 41 as the management information # 2. The device IP address) is cumulatively stored as the above-described history information.

With the above configuration, in the wireless LAN system of this example, a plurality of master station devices 1 connected via line B
a to 1c and a plurality of mobile station devices 2a to 2 moving in the communicable areas A1 to A3 of the plurality of master station devices 1a to 1b.
f, and each of the master station devices 1a to 1c manages the identification information (MAC address) of the mobile station device 2a to 2f in its own communicable area A1 to A3 and manages the mobile station device 2a to 2f.
wireless communication of information with the f. In the wireless LAN system of this example, the information processing devices 3a to 3b shown in FIG. 1 are stored in the extended MIB database of each of the master station devices 1a to 1c, for example, as a function of an SNMP manager. A function of searching the BSA movement history information via the line B is provided.

Next, as an example, the case where the mobile station apparatus 2a moves from the communicable area A1 of the master station apparatus 1a to the communicable area A2 of the adjacent master station apparatus 1b will be described.
Examples of the operations performed by the master stations a to 2f and the master stations 1a to 1c of the present embodiment will be specifically described. Note that, as described above, in this example, a similar operation is performed immediately after the mobile station device 2a is started. First, the operating frequency fa of the master station device 1a
And the operating frequency fb of the master station device 1b is different from the operating frequency fb of the master station device 1b.
When the mobile station device 2a moves to the communicable area A2 of the master station device 1b, the mobile station device 2a temporarily loses synchronization with the master station devices 1a and 1b.

When the mobile station device 2a detects out-of-synchronism with the master station devices 1a and 1b, it attempts to resynchronize with the master station device by sequentially switching a plurality of preset frequencies (candidate frequencies), for example. As the candidate frequency, for example, the master station device (master station device 1) of the wireless LAN system shown in FIG.
a to 1c) (frequency f
a, fb, fc, etc.) are set.

In this example, the mobile station apparatus 2a switches the operating frequency to the frequency fb and attempts re-synchronization, thereby establishing the synchronization between the mobile station apparatus 2a and the destination master station apparatus 1b. When the synchronization with the destination master station device 1b is thus established, the mobile station device 2a wirelessly transmits the transmission request signal 31 shown in FIG. 2 to the master station device 1b.

Next, upon receiving the above-mentioned transmission request signal 31 from the mobile station device 2a that has moved to its own communicable area A2, the parent station device 1b at the destination receives the transmission request signal 31 from the mobile station device 2a. The transmission permission signal 61 shown in FIG. As described above, the transmission permission signal 61 includes, for example, the IP address of the parent station device 1b stored in the memory provided in the destination parent station device 1b. Here, in FIG. 7, the master station device 1b is connected to the mobile station device 2a.
When the transmission request signal 31 is received from the
6 shows an example of the procedure of the process performed by b.

That is, when the master station device 1b receives the transmission request signal 31 from, for example, the mobile station device 2a (step S1), information indicating that the mobile station identifiers in the transmission request signal 31 are all “0” ( ALL
“0”) is determined (step S2). As a result, when it is determined that the mobile station identifier in the received transmission request signal 31 is ALL “0”, the parent station device 1b transmits the transmission request signal 31 to the mobile station device 2
a, the MAC address of the mobile station device 2a included in the transmission request signal 31 is managed (registered) by its own mobile station management table 51.
It is determined whether or not it has been performed (step S3).

As a result, when it is determined that the MAC address of the mobile station 2a included in the received transmission request signal 31 is not managed by its own mobile station management table 51, the master station 1b determines The mobile station device 2a corresponding to the address is another master station device (such as the master station device 1a).
The mobile station device 2a is newly assigned a mobile station identifier to the mobile station device 2a, and the mobile station identifier is associated with the MAC address. These are newly registered and managed in the mobile station management table 51 (step S4).

When the MAC address and the like of the mobile station 2a are newly registered in this way, the master station 1b wirelessly transmits the transmission permission signal 61 to the mobile station 2a (step S5). If it is determined that the MAC address of the mobile station device 2a included in the received transmission request signal 31 is managed by its own mobile station management table 51 (step S3), the master station device 1b, for example, MAC address in mobile station management table 5
1 and wirelessly transmits the transmission permission signal 61 to the mobile station device 2a without newly registering the mobile station device 2a (step S1).
5).

Next, when the mobile station device 2a receives the transmission permission signal 61 wirelessly transmitted from the destination master station device 1b as described above, the UDP frame indicating the BSA movement notification shown in FIG. 41 is wirelessly transmitted to the parent station 1b of the destination while being addressed to the parent station 1a of the source. Here, FIG. 8 illustrates an example of a procedure of a process performed by the mobile station device 2a when the mobile station device 2a receives the transmission permission signal 61 from the master station device 1b.

That is, in the mobile station apparatus 2a, for example, when the transmission request signal 31 is wirelessly transmitted to the destination parent station apparatus 1b, the mobile station apparatus 2a shifts to a state of waiting for the transmission permission signal reception, and the transmission permission signal 61 from the parent station apparatus 1b. Is received (step S
11) It is determined whether or not the MAC address of the mobile station device (allowed mobile station MAC address) included in the transmission permission signal 61 matches, for example, its own MAC address stored in its own memory (step S1).
2).

As a result, when it is determined that the MAC address of the mobile station device included in the received transmission permission signal 61 matches its own MAC address, the mobile station device 2a transmits the transmission permission signal 61 addressed to itself. Assuming that the signal is a signal, the IP address of the master station device 1b of the transmission source included in the transmission permission signal 61 is extracted (step S13),
It is determined whether the IP address matches the IP address of the master station managed by its own memory (the non-volatile memory) (step S14).

In this example, since the mobile station device 2a is moving in the communicable areas A1 and A2 of the master station devices 1a and 1b, the non-volatile memory stores the source from which the previous synchronization was established. The mobile station 2a stores the IP address of the master station 1b included in the received transmission permission signal 61 and the parent address stored in the non-volatile memory. IP of station device 1a
It is determined that the address is different.

When such a determination is made, the mobile station device 2a
Detects that it has moved from the communicable area A1 of one master station apparatus 1a to the communicable area A2 of another master station apparatus 1b, and moves the UDP frame 41 addressed to the master station apparatus 1a of the movement source. The wireless communication is performed to the destination master station 1b (step S15), and the IP address of the destination master station 1b is transmitted.
The IP address stored in the nonvolatile memory is updated with the address (step S16).

Next, when the destination master station 1b receives the UDP frame 41 wirelessly transmitted from the mobile station 2a as described above, the received UDP frame 41
Is transmitted via the line B to the destination parent station device 1a as the destination. Next, when the source master station device 1a receives the self-addressed UDP frame 41 transmitted from the destination master station device 1b via the line B, the movement included in the UDP frame 41 as the management information # 1 is performed. Station device 2a
Is deleted from its own mobile station management table 51.

Here, FIG. 9 shows that the master station device 1a transmits a UDP addressed to itself according to the BSA movement notification from another master station device 1b.
An example of a procedure of a process performed by the master station device 1a when receiving the frame 41 is shown. That is, when the source master station device 1a receives, for example, the UDP frame 41 addressed to itself relating to the BSA movement notification from the destination master station device 1b (step S21), the UDP frame 4
1 of the mobile station device 2a included as management information # 1
It is determined whether the C address is managed (registered) by its own mobile station management table 51 or not.
1 is searched for and determined (step S22).

Here, in this example, the MAC of the mobile station device 2a is
Since the address is managed by the source master station device 1a, the source master station device 1a includes the mobile station device 2a included in the received UDP frame 41 as the management information # 1.
Is determined to be managed by its own mobile station management table 51.

When such a determination is made, the parent station 1a of the source station 1a moves to the parent station 1a of the destination station 2a.
The IP address b is stored in the extended MIB database shown in FIG. 6 as BSA movement history information in association with the MAC address of the mobile station device 2a (step S23). The corresponding mobile station identifier is deleted from its own mobile station management table 51 (step S2).
4). Note that such a search process of the mobile station management table 51 and a process of deleting the MAC address are performed, for example, in the master station device 1.
This is performed by the function of the SNMP agent provided in a.

As described above, in the wireless LAN system of the present embodiment, for example, the mobile station device 2a moves from the communicable area A1 of one master station apparatus 1a to the communicable area A2 of another master station apparatus 1b.
When the mobile station apparatus 2a moves to the
UD addressed to only the parent station 1a of the movement source
Since the P-frame 41 is transmitted to the source master station device 1a via the destination master station device 1b, the destination master station device, for example, transmits identification information of the mobile station device in the network as in the related art. It is not necessary to notify all other master stations. For this reason, in the wireless LAN system of this example, the identification information (MAC address) of the mobile station device 2a
Can be streamlined to notify the parent station device 1a of the movement source, thereby reducing the traffic volume of the line B and improving the communication efficiency.

Then, in the wireless LAN system of this example,
As described above, the identification information (MAC address) of the mobile station device 2a that has moved to the communicable area A2 of the other master station device 1b is notified to the source master station device 1a, and the source master station device 1a is notified.
a deletes the identification information of the mobile station device 2a from the management target based on the content of the notification, the useless wireless transmission to the mobile station device 2a is performed in the source master station device 1a. Can be prevented, and thereby, it is possible to prevent the throughput of the information communication in the wireless section from being reduced.

The network management technique of this embodiment is particularly suitable for a wireless LAN in which a large number of mobile station devices 2a to 2f exist in a network and BSA movement of the mobile station devices 2a to 2f occurs frequently. A great effect is exhibited in the system, and even in such a system, it is possible to efficiently manage the mobile station devices 2a to 2f by the master station devices 1a to 1c without reducing the throughput.

In the wireless LAN system of this example, each of the master stations 1a to 1c stores the BSA movement history information of the mobile stations 2a to 2f.
a, 3b, etc., the BSA movement history information can be searched, so that the mobile station apparatuses 2a to 2b can be searched.
f movement tracking and position detection can be performed efficiently,
Thereby, the management of the mobile station devices 2a to 2f can be made more efficient.

Here, in the above embodiment, the mobile station device 2a
When 2f detects out-of-synchronization with master station devices 1a-1c, it requests resynchronization and establishes an authentication request with respect to master station devices 1a-1c (transmission of transmission request signal 31). (Mobile station devices 2a to 2a)
f) is the communicable area A1-A of the other master station devices 1a-1c.
3 is detected, but various methods may be used for the detection according to, for example, the configuration of the system. As an example, when a configuration is used in which each master station device reports its identification information to the mobile station device by radio transmission at regular intervals, the mobile station device wirelessly receives from the master station device. It is possible to detect its own movement in response to the identification information being different (that is, changing from the identification information of the source master station apparatus to the identification information of the destination master station apparatus).

In the above embodiment, the mobile station devices 2a to 2a
2f wirelessly transmits the UDP frame 41 addressed to the source master stations 1a to 1c to the destination master stations 1a to 1c, thereby transmitting the UDP frame 41 from the destination master stations 1a to 1c to the source. However, as a method of notifying the identification information of the mobile station device to the parent station device of the movement source, various methods are used according to, for example, the system configuration and the like. Is also good. As an example, the mobile station device wirelessly transmits its own identification information and the identification information of the source master station device to the destination master station device by separate signals, while the destination master station device transmits the identification information of the mobile station device. It is also possible to use a method of judging the information received from the mobile station apparatus and transmitting the identification information of the mobile station apparatus to the parent station apparatus of the movement source via a line.

Further, the configuration of the radio communication system according to the present invention is not necessarily limited to the one described above, and various configurations may be used. For example, in the above-described embodiment, the case where the wireless communication system according to the present invention is applied to a wireless LAN system as a preferred embodiment has been described. However, the wireless communication system according to the present invention can be applied to other systems. .

Further, the number and configuration of a plurality of master stations provided in the radio communication system according to the present invention may be in various forms, and the number and configuration of mobile stations may be various. Various embodiments may be used. As the identification information of the master station device and the identification information of the mobile station device, any information may be used as long as the information can identify each device.

The various processes performed by the master station device and the mobile station device provided in the radio communication system according to the present invention are executed by executing the control program on a hardware resource including a processor and a memory, for example. , And each functional unit for executing the processing may be configured as an independent hardware circuit. Further, the present invention can be understood as a computer-readable recording medium such as a floppy (registered trademark) disk or a CD-ROM in which the above-mentioned control program is stored. The processing according to the present invention can be performed by causing a processor to execute the processing.

[0066]

As described above, according to the radio communication system of the present invention, for example, when a mobile station device moves from the communicable area of one master station apparatus to the communicable area of another master station apparatus, The mobile station device wirelessly transmits its own identification information and the identification information of the source master station device to the destination master station device, and the destination master station device receives the mobile station device from the mobile station device. The identification information of the station device is transmitted to the source master station device via the line, and the identification information of the mobile station device received from the destination master station device is deleted from the management target by the source master station device. For example, since it is not necessary for the parent station device of the movement destination to notify the identification information of the mobile station device to all other parent station devices in the network as in the related art, Processing for notifying identification information to the source master station device It can be made more efficient, this makes it possible to improve the small to communication efficiency traffic volume of the line.

[Brief description of the drawings]

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

FIG. 2 is a diagram illustrating an example of a transmission request signal.

FIG. 3 is a diagram illustrating an example of a UDP frame.

FIG. 4 is a diagram showing an example of a mobile station management table.

FIG. 5 is a diagram illustrating an example of a transmission permission signal.

FIG. 6 is a diagram conceptually illustrating an example of BSA movement history information stored by a master station device.

FIG. 7 is a diagram illustrating an example of a procedure of a process performed when a master station device receives a transmission request signal.

FIG. 8 is a diagram illustrating an example of a procedure of a process performed when the transmission permission signal is received by the mobile station device.

FIG. 9 is a diagram illustrating an example of a procedure of a process performed when a master station device receives a UDP frame.

[Explanation of symbols]

1a to 1c: master station device, 2a to 2f: mobile station device, B: line, 3a, 3b ... PC, A1 to A3
..Communicable area, 11 mobile station receiving means, 12
Mobile station managing means, 13 mobile station identification information transmitting means,
14 ····························································································· 26: movement history storage means, 31: transmission request signal, 41: UDP frame, 51: mobile station management table, 61: transmission permission signal,

Claims (1)

[Claims] A plurality of master stations connected via a line; and a mobile station moving in a communicable area of the plurality of master stations, wherein each master station is in its own communicable area. In a wireless communication system that manages identification information of an existing mobile station device and wirelessly communicates with the mobile station device, the mobile station device includes a mobile station receiving unit that wirelessly receives the identification information of the master station device from the master station device. A mobile station management means for managing identification information of a master station in a communicable area where the mobile station is located; a mobile station identification information transmitting means for wirelessly transmitting the identification information of the master to a master station; Source base station identification information transmitting means for wirelessly transmitting the identification information of the source base station apparatus to the apparatus, while the base station apparatus wirelessly transmits the identification information of the mobile station apparatus from the mobile station apparatus. Master station receiving means to receive and own communication Master station management means for managing the identification information of the mobile station device in the available area; master station identification information transmitting means for wirelessly transmitting its own identification information to the mobile station device; Notification means for transmitting, via a line, the identification information of the mobile station apparatus to the master station apparatus corresponding to the identification information of the master station apparatus from which the station apparatus has moved, and a movement received via the line from another master station apparatus And a deletion unit for deleting the identification information of the station device from the management target by the master station management unit.