JP2009239513A - Radio lan terminal, radio base station, and roaming processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a required time for roaming operation. <P>SOLUTION: In a radio LAN terminal 10, a plurality of MAC addresses corresponding to radio base stations 20 to which the radio LAN terminal 10 can be connected, are stored in a storage section 13 beforehand, and in roaming to different radio base stations 20, an arbitrary MAC address read from the storage section 13 is selected by a communication control section 12, and a radio communication section 11 performs authentication processing and registration processing with the radio base station 20 of the MAC address selected by the communication control section 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wireless communication technique, and more particularly to a roaming technique for switching a wireless base station in a wireless LAN terminal.

In a wireless LAN terminal that performs wireless communication using a wireless LAN, when a radio wave level from a connected wireless base station (AP: Access Point) falls below a predetermined threshold, a connection with a new wireless base station is established. The roaming process for performing is performed.
For example, in a wireless LAN, in this roaming process, first, a probe request (Probe Request) is broadcasted from the wireless LAN terminal, and a probe response (Probe Response) is received from a corresponding wireless base station. Scan for wireless base stations in the vicinity.

  Subsequently, one of the wireless base stations that can receive the probe response is selected, and the wireless LAN terminal uses the MAC address of the wireless base station notified by the probe response to transmit the wireless base station. Authentication processing is completed by transmitting an authentication request (Authentication Request) to the base station by unicast and receiving an authentication response (Authentication Response) returned from the wireless base station accordingly.

Thereafter, a registration request (Associate Request) is transmitted from the wireless LAN terminal to the wireless base station by unicast, and a registration response (Associate Response) returned from the wireless base station is received accordingly. Complete the registration process.
The wireless LAN terminal is connected to a new wireless base station having a higher radio wave level through such scanning processing, authentication processing, and registration processing, and continues good data communication.

IEEE 802.11, "Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications," http://grouper.ieee.org/groups/802/11/

However, in such a conventional technique, it takes time to scan for finding a new radio base station and acquiring a MAC address. Therefore, as the number of channels to be scanned increases, the time required for the roaming operation increases accordingly. Data communication is temporarily interrupted. For this reason, when a wireless LAN terminal is talking by exchanging voice packets by data communication, there is a problem in that sound interruption occurs due to roaming operation, which leads to deterioration of the call quality.
The present invention has been made to solve such problems, and an object of the present invention is to provide a wireless LAN terminal, a wireless base station, a wireless system, and a roaming processing method that can shorten the time required for a roaming operation.

  In order to achieve such an object, a wireless LAN terminal according to the present invention performs data communication by connecting to a wireless base station via a wireless channel, and at the time of newly roaming to the wireless base station, an arbitrary MAC A wireless LAN terminal that performs authentication processing and registration processing for roaming with a wireless base station corresponding to an address, and a plurality of MAC addresses corresponding to wireless base stations to which the wireless LAN terminal can be connected A storage unit that stores in advance, a communication control unit that selects a MAC address of a wireless base station that is a roaming destination from among the MAC addresses of the storage unit when roaming to a different wireless base station, and a communication control unit that is used when roaming A wireless communication unit that performs authentication processing and registration processing for roaming with a wireless base station corresponding to the selected MAC address There.

  At this time, the communication control unit receives base station information indicating a radio base station that can be a candidate when the wireless LAN terminal roams from the radio base station to another, and saves it in the storage unit. At the time of new roaming, the MAC address of the radio base station corresponding to the base station information among the MAC addresses may be preferentially selected from the storage unit.

  In addition, the wireless base station according to the present invention performs data communication by connecting to a wireless LAN terminal via a wireless channel, and performs roaming with the wireless LAN terminal when newly roaming with the wireless LAN terminal. A storage unit that preliminarily stores base station information indicating a wireless base station that can be a roaming destination when a wireless LAN terminal roams from one wireless base station to another; And a communication control unit that reads base station information from the storage unit and transmits it to the wireless LAN terminal when roaming with the wireless LAN terminal.

  In addition, the roaming processing method according to the present invention performs data communication by connecting to a radio base station via a radio channel, and a radio base station corresponding to an arbitrary MAC address when newly roaming to the radio base station. Is a roaming processing method for a wireless LAN terminal that performs authentication processing and registration processing for roaming, and a plurality of MAC addresses corresponding to wireless base stations to which the wireless LAN terminal can be connected are stored in advance in a storage unit Select the storage step to store, the communication control step to select the MAC address of the wireless base station that is the roaming destination when roaming to a different wireless base station, from the MAC address of the storage unit, and the communication control step to roam Authentication processing and registration processing for roaming with a wireless base station corresponding to the MAC address assigned And a radio communication step of performing.

  At this time, in the communication control step, base station information indicating a radio base station that can be a candidate when the wireless LAN terminal roams from the radio base station to another is received from the radio base station and stored in the storage unit. At the time of new roaming, the MAC address of the radio base station corresponding to the base station information among the MAC addresses may be preferentially selected from the storage unit.

  In addition, another roaming processing method according to the present invention performs data communication by connecting to a wireless LAN terminal via a wireless channel, and newly roaming with the wireless LAN terminal, A wireless base station roaming processing method for performing authentication processing and registration processing for roaming, wherein base station information indicating a wireless base station that can be a roaming destination when a wireless LAN terminal roams from the wireless base station to another A storage step that is stored in advance in the storage unit, and a communication control step that reads base station information from the storage unit and transmits it to the wireless LAN terminal when roaming with the wireless LAN terminal.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to skip the scanning process which scans the other radio base station which can be connected at the time of roaming, and can shorten the time required for a roaming process. For this reason, when the wireless LAN terminal is talking by exchanging voice packets by data communication, it is possible to reduce the occurrence of sound interruption due to roaming operation and to improve the deterioration of the call quality.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, a wireless LAN terminal according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of a wireless LAN terminal according to the first embodiment of the present invention.

  FIG. 1 shows an example of a wireless communication system including a wireless base station 20 (20A, 20B, 20C) and a wireless LAN terminal 10. In FIG. 1, three radio base stations 20A, 20B, and 20C are shown, but the number of radio base stations constituting the radio communication system is not limited to three, and two or more. The present invention can be applied to any wireless communication system including the wireless base station 20.

[Wireless LAN terminal]
First, the configuration of the wireless LAN terminal 10 according to the first exemplary embodiment of the present invention will be described with reference to FIG.
The wireless LAN terminal 10 has a function of performing data communication by connecting to any one of the wireless base stations 20 via a wireless channel.
The wireless LAN terminal 10 includes a wireless communication unit 11, a communication control unit 12, and a storage unit 13 as main functional units.
The wireless communication unit 11 is composed of a dedicated wireless communication circuit, and is connected to a wireless base station via a wireless channel, thereby transmitting and receiving various data and communication control during roaming to connect to a new wireless base station 20. It has a function of performing authentication processing and registration processing for roaming with the radio base station 20 corresponding to the MAC address selected by the unit 12.

  The storage unit 13 includes a storage device such as a memory, and has a function of storing processing information and programs used in the communication control unit 12 in advance. As main processing information stored in the storage unit 13, there is address information 13A in which a plurality of MAC addresses corresponding to the wireless base station 20 to which the wireless LAN terminal 10 can be connected are registered.

  FIG. 2 is a configuration example of address information. Here, a base station ID, which is identification information of the wireless base station 20 with which the wireless LAN terminal 10 can communicate, and a MAC address of the wireless base station are registered in advance as a set. In this example of the radio communication system, the MAC addresses of the radio base stations 20A, 20B, and 20C are registered in the storage unit 13 as the address information 13A. The address information 13A may be registered when the radio base station 20 constituting the radio communication system is determined, and updated according to the addition / change of the radio base station 20.

  The communication control unit 12 includes a CPU that performs various processes by executing a program, and serves as a roaming destination when roaming to a new radio base station 20 and a function for controlling data communication using the radio communication unit 11. It has a function of selecting the MAC address of the radio base station 20 from the MAC addresses of the storage unit 13.

[Radio base station]
Next, the configuration of the radio base station according to the first embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing the configuration of the radio base station according to the first embodiment of the present invention.
The wireless base station 20 (20A, 20B, 20C) has a function of performing data communication by connecting to the wireless LAN terminal 10 via a wireless channel.

The radio base station 20 includes a radio communication unit 21, a communication control unit 22, a storage unit 23, and a communication interface unit (hereinafter referred to as a communication I / F unit) 24 as main functional units.
The wireless communication unit 21 includes a dedicated wireless communication circuit, and is connected to the wireless LAN terminal 10 through a wireless channel, thereby transmitting and receiving various data, and when roaming with the wireless LAN terminal 10, the wireless LAN terminal 10 has a function of performing authentication processing and registration processing for roaming.

The storage unit 23 includes a storage device such as a memory and has a function of storing various processing information and programs used for processing in the communication control unit 22.
The communication control unit 22 includes a CPU that performs various processes by executing a program. The function for controlling data communication using the wireless communication unit 21 and the base station from the storage unit 23 when roaming with the wireless LAN terminal 10 are performed. A function of reading the information 23A and transmitting the information 23A to the wireless LAN terminal 10;

[Operation of First Embodiment]
Next, with reference to FIG. 4, the operation of the wireless communication system according to the first embodiment of the present invention will be described. FIG. 4 is a sequence diagram showing roaming processing of the wireless communication system according to the first embodiment of the present invention. Here, a case where the wireless LAN terminal 10 roams from the wireless base station 20A to the wireless base station 20B will be described as an example.

  When the wireless LAN terminal 10 is performing data communication with the wireless base station 20A (step 100), and the radio wave level from the wireless base station 20A is lowered to a predetermined threshold value (step 101), the wireless communication unit 11 performs communication. The controller 12 is notified of a decrease in radio wave level. In response to this, the communication control unit 12 selects and reads an arbitrary MAC address, here the MAC address of the radio base station 20B, from the address information 13A of the storage unit 13, and outputs it to the radio communication unit 11 (step 102). ).

The wireless communication unit 11 uses the MAC address designated by the communication control unit 12 to transmit an authentication request (Authentication Request) to the corresponding wireless base station 20B by unicast (step 103).
The wireless communication unit 21 of the wireless base station 20B performs predetermined authentication confirmation in response to the authentication request from the wireless LAN terminal 10, and returns an authentication response (Authentication Response) to the wireless LAN terminal 10 in response to the successful authentication. (Step 104).
The wireless communication unit 11 of the wireless LAN terminal 10 receives the authentication response from the wireless base station 20B and completes the authentication process.

  At this time, the wireless communication unit 11 of the wireless LAN terminal 10 notifies the communication control unit 12 of an authentication error when the authentication response cannot be received before a predetermined time elapses from the transmission of the authentication request. In response to the notification of the authentication error, the communication control unit 12 reads out an unselected MAC address from the address information 13A in the storage unit 13 and outputs it to the wireless communication unit 11 (step 102). The wireless communication unit 11 uses the MAC address designated by the communication control unit 12 to transmit an authentication request (Authentication Request) to the corresponding wireless base station 20B by unicast (step 103). Thereafter, steps 102 and 103 are repeatedly executed until successful authentication is obtained or until all the MAC addresses in the address information 13A are selected.

Subsequently, the wireless communication unit 11 of the wireless LAN terminal 10 transmits a registration request (Associate Request) to the wireless base station 20B by unicast using the MAC address designated by the communication control unit 12 (step 105).
The wireless communication unit 21 of the wireless base station 20B performs predetermined registration confirmation in response to a registration request from the wireless LAN terminal 10, and returns a registration response (Associate Response) to the wireless LAN terminal 10 in response to the successful registration. (Step 106).
The wireless communication unit 11 of the wireless LAN terminal 10 receives the registration response from the wireless base station 20B and completes the registration process.

  The communication control unit 12 of the wireless LAN terminal 10 starts data communication with the wireless base station 20B via the wireless communication unit 11 after confirming the completion of the authentication process and the registration process by the wireless communication unit 11. (Step 107), a series of roaming processes is terminated.

[Effect of the first embodiment]
As described above, according to the present embodiment, roaming is performed using a MAC address corresponding to the wireless base station 20 that can be connected to the wireless LAN terminal 10 and registered in the storage unit 13 in advance. Therefore, it is possible to omit the scanning process for scanning other wireless base stations that can be connected during roaming, and the time required for the roaming process can be shortened.
For this reason, when the wireless LAN terminal is talking by exchanging voice packets by data communication, it is possible to reduce the occurrence of sound interruption due to roaming operation and to improve the deterioration of the call quality.

[Second Embodiment]
Next, a radio base station according to the second embodiment of the present invention will be described with reference to FIG. FIG. 5 is a block diagram showing a configuration of a radio base station according to the second embodiment of the present invention, where the same or equivalent parts as those in FIG. 3 are given the same reference numerals.

  In the first embodiment, when roaming to a new wireless base station 20, an arbitrary MAC address is selected from a plurality of MAC addresses stored in advance in the storage unit 13 of the wireless LAN terminal 10. The case of using was described as an example. In the present embodiment, a case will be described in which, when roaming to a new radio base station 20, the MAC address designated by the radio base station 20 is used as an example for the next roaming process.

  In the present embodiment, in the storage unit 23 of the radio base station 20 (20A, 20B, 20C), as processing information used in the communication control unit 22, the wireless LAN terminal 10 roams from the radio base station 20 to another. The base station information 23A for identifying the radio base station 20 that can be a candidate for is registered in advance. The base station information 23A may be a base station ID corresponding to the MAC address of the wireless base station 20 that can be a candidate among the MAC addresses registered in the address information 13A of the wireless LAN terminal 10, or a wireless base that can be a candidate. The MAC address of the station 20 may be used.

When the roaming is performed, for example, after the authentication process and the registration process with the wireless LAN terminal 10 are completed, the communication control unit 22 responds to the base station information request transmitted from the wireless LAN terminal 10 and the base station in the storage unit 23 The information 23A is read and transmitted.
When the communication control unit 12 of the wireless LAN terminal 10 connects to a new wireless base station by roaming, for example, after the authentication process and the registration process with the wireless base station 20 are completed, A function of transmitting a base station information request, a function of receiving the base station information 23A notified from the radio base station 20 in response to the function, and storing it in the storage unit 13; A function of preferentially selecting the MAC address of the radio base station corresponding to the base station information 23A from the storage unit 13.
Other configurations of the wireless LAN terminal 10 and the wireless base station 20 according to the present embodiment are the same as those of the first embodiment, and detailed description thereof is omitted here.

[Operation of Second Embodiment]
Next, with reference to FIG. 6, the operation of the wireless communication system according to the second embodiment of the present invention will be described. FIG. 6 is a sequence diagram showing a roaming process of the wireless communication system according to the second embodiment of the present invention. The same reference numerals are given to the same or equivalent parts as those in FIG. Here, a case where the wireless LAN terminal 10 performs roaming from the wireless base station 20A to the wireless base station 20B, and further from the wireless base station 20B to the wireless base station 20C will be described as an example. Further, it is assumed that the radio base station 20A and the radio base station 20C are registered in the base station information 23A of the radio base station 20B.

  When the wireless LAN terminal 10 is performing data communication with the wireless base station 20A (step 100), and the radio wave level from the wireless base station 20A is lowered to a predetermined threshold value (step 101), the wireless communication unit 11 performs communication. The controller 12 is notified of a decrease in radio wave level. In response to this, the communication control unit 12 selects and reads an arbitrary MAC address, here the MAC address of the radio base station 20B, from the address information 13A of the storage unit 13, and outputs it to the radio communication unit 11 (step 102). ).

The wireless communication unit 11 uses the MAC address designated by the communication control unit 12 to transmit an authentication request (Authentication Request) to the corresponding wireless base station 20B by unicast (step 103).
The wireless communication unit 21 of the wireless base station 20B performs predetermined authentication confirmation in response to the authentication request from the wireless LAN terminal 10, and returns an authentication response (Authentication Response) to the wireless LAN terminal 10 in response to the successful authentication. (Step 104).
The wireless communication unit 11 of the wireless LAN terminal 10 receives the authentication response from the wireless base station 20B and completes the authentication process.

  At this time, the wireless communication unit 11 of the wireless LAN terminal 10 notifies the communication control unit 12 of an authentication error when the authentication response cannot be received before a predetermined time elapses from the transmission of the authentication request. In response to the notification of the authentication error, the communication control unit 12 reads out an unselected MAC address from the address information 13A in the storage unit 13 and outputs it to the wireless communication unit 11 (step 102). The wireless communication unit 11 uses the MAC address designated by the communication control unit 12 to transmit an authentication request (Authentication Request) to the corresponding wireless base station 20B by unicast (step 103). Thereafter, steps 102 and 103 are repeatedly executed until successful authentication is obtained or until all the MAC addresses in the address information 13A are selected.

Subsequently, the wireless communication unit 11 of the wireless LAN terminal 10 transmits a registration request (Associate Request) to the wireless base station 20B by unicast using the MAC address designated by the communication control unit 12 (step 105).
The wireless communication unit 21 of the wireless base station 20B performs predetermined registration confirmation in response to a registration request from the wireless LAN terminal 10, and returns a registration response (Associate Response) to the wireless LAN terminal 10 in response to the successful registration. (Step 106).
The wireless communication unit 11 of the wireless LAN terminal 10 receives the registration response from the wireless base station 20B and completes the registration process.

The communication control unit 12 of the wireless LAN terminal 10 confirms the completion of the authentication process and the registration process by the wireless communication unit 11, and then the new wireless base station that is the roaming processing destination via the wireless communication unit 11. A base station information request for requesting transmission of base station information is transmitted to 20 (step 110).
When receiving the base station information request from the wireless LAN terminal 10 via the wireless communication unit 21, the communication control unit 22 of the wireless base station 20B reads the base station information 23A from the storage unit 23 (step 111), and performs wireless communication. The data is transmitted to the wireless LAN terminal 10 via the unit 21 (step 112).

The communication control unit 12 of the wireless LAN terminal 10 stores the base station information 23A received from the wireless base station 20B via the wireless communication unit 11 in the storage unit 13 (step 113).
After acquiring the base station information 23A from the radio base station 20B in this way, the communication control unit 12 of the wireless LAN terminal 10 starts data communication with the radio base station 20B via the radio communication unit 11 (step 107). ), A series of roaming processes is terminated.

  Thereafter, when the wireless LAN terminal 10 performs data communication with the wireless base station 20B and the radio wave level from the wireless base station 20B decreases to a predetermined threshold (step 120), the wireless communication unit 11 performs communication control. The unit 12 is notified of a decrease in radio wave level. In response to this, the communication control unit 12 confirms the base station information 23A in the storage unit 13 (step 121), and among the address information 13A, the MAC address of the radio base station 20 specified by the base station information 23A is obtained. The priority is selected, read, and output to the wireless communication unit 11 (step 122).

Accordingly, the radio base station 20 that can be a candidate for roaming from the radio base station 20B notified when roaming with the radio base station 20B is preferentially selected.
Here, when the radio base station 20C is preferentially selected, the radio communication unit 11 uses the MAC address of the radio base station 20C designated by the communication control unit 12 to communicate with the corresponding radio base station 20C. The execution of the roaming process from steps 103 to 113 described above is started.

[Effect of the second embodiment]
Thus, according to the present embodiment, when connected to a new radio base station 20, the base station information 23A including the radio base station that can be a candidate for roaming from the radio base station 20 to another, Since it has been received from the radio base station and roamed from the radio base station 20 to another, the MAC address corresponding to the base station information 23A is preferentially selected from the MAC addresses of the storage unit 13. , It is possible to preferentially select a MAC address that is likely to succeed in the roaming process.

For this reason, even in a radio communication system having a relatively large number of radio base stations 20, it is possible to connect to the radio base station 20 capable of communication efficiently and in a short time. Therefore, when the wireless LAN terminal is talking by exchanging voice packets by data communication, it is possible to greatly reduce the occurrence of sound interruption due to roaming operation and to improve the deterioration of the call quality. .
Also, if there is no response from the radio base station 20 even after a predetermined time has elapsed since the request for base station information from the wireless LAN terminal 10, the radio base station 20 has a function of notifying the base station information according to the present embodiment. Based on the first embodiment described above, it is possible to perform roaming processing by determining that it is not provided.

Further, in the present embodiment, the case where the base station information 23A is notified from the radio base station 20 in response to a request from the wireless LAN terminal 10 has been described as an example. It is not limited to.
For example, the base station information 23A may be notified from the wireless base station 20 to the wireless LAN terminal 10 without making a request from the wireless LAN terminal 10 when the authentication process and registration process for roaming are completed. .

Further, in the present embodiment, the case where the base station information 23A is notified from the radio base station 20 at the time when the authentication process and registration process for roaming are completed has been described as an example. However, the present invention is not limited to this.
For example, the base station information 23A may be acquired at a timing immediately before the start of the authentication process for roaming or between the end of the authentication process and the start of the registration process. Further, the acquisition timing of the base station information 23A may be after the roaming process is completed and data communication is started. For example, at the start of roaming processing to a different radio base station 20 according to a decrease in radio wave level, the base station information 23A may be acquired by requesting the roaming source radio base station 20 from the radio LAN terminal 10.

  In the present embodiment, the case where the wireless LAN terminal 10 acquires the base station information 23A from the wireless base station 20 for each roaming has been described as an example. However, the base station information 23A is wirelessly transmitted for each wireless base station. Stored in the storage unit 13 of the LAN terminal 10, when roaming, the base station information 23 A of the wireless base station 20 that is the roaming source is read from the storage unit 13, and the MAC address of the new wireless base station 20 that is the roaming destination May be selected with priority. In addition, when the base station information 23A is updated according to the movement or change of the radio base station 20, a notification of the update of the base station information 23A from the radio base station 20 to the radio LAN terminal 10 during roaming, and also after the update The base station information 23A may be notified.

It is a block diagram which shows the structure of the wireless LAN terminal concerning the 1st Embodiment of this invention. It is an example of a structure of address information. It is a block diagram which shows the structure of the wireless base station concerning the 1st Embodiment of this invention. It is a sequence diagram which shows the roaming process of the radio | wireless communications system concerning the 1st Embodiment of this invention. It is a block diagram which shows the structure of the wireless base station concerning the 2nd Embodiment of this invention. It is a sequence diagram which shows the roaming process of the radio | wireless communications system concerning the 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Wireless LAN terminal, 11 ... Wireless communication part, 12 ... Communication control part, 13 ... Memory | storage part, 13A ... Address information, 20, 20A, 20B, 20C ... Wireless base station, 21 ... Wireless communication part, 22 ... Communication control Part, 23 ... storage part, 23A ... base station information, 24 ... communication I / F part.

Claims (6)

Authentication processing for roaming with a wireless base station corresponding to an arbitrary MAC address at the time of newly roaming to a wireless base station while performing data communication by connecting to a wireless base station via a wireless channel And a wireless LAN terminal that performs registration processing,
A storage unit that stores in advance a plurality of MAC addresses corresponding to wireless base stations to which the wireless LAN terminal can be connected;
A communication control unit that selects a MAC address of a wireless base station that is a roaming destination from among the MAC addresses of the storage unit when roaming to a different wireless base station;
A wireless LAN terminal comprising: a wireless communication unit that performs authentication processing and registration processing for roaming with a wireless base station corresponding to the MAC address selected by the communication control unit during the roaming . The wireless LAN terminal according to claim 1,
The communication control unit receives, from the wireless base station, base station information indicating a wireless base station that can be a candidate when the wireless LAN terminal roams from the wireless base station to the other, and stores it in the storage unit. A wireless LAN terminal that preferentially selects, from the storage unit, a MAC address of a wireless base station corresponding to the base station information from among the MAC addresses during new roaming. A wireless base for performing data communication by connecting to a wireless LAN terminal via a wireless channel and performing authentication processing and registration processing for roaming with the wireless LAN terminal when newly roaming with the wireless LAN terminal Station,
A storage unit that stores in advance base station information indicating a wireless base station that can be a roaming destination when the wireless LAN terminal roams from the wireless base station to another;
A wireless base station comprising: a communication control unit that reads out the base station information from the storage unit and transmits the information to the wireless LAN terminal when roaming with the wireless LAN terminal. Authentication processing for roaming with a wireless base station corresponding to an arbitrary MAC address at the time of newly roaming to a wireless base station while performing data communication by connecting to a wireless base station via a wireless channel And a roaming processing method for a wireless LAN terminal that performs registration processing,
A storage step of storing a plurality of MAC addresses corresponding to wireless base stations connectable to the wireless LAN terminal in the storage unit;
A communication control step of selecting a MAC address of a wireless base station that is a roaming destination from among MAC addresses of the storage unit when roaming to a different wireless base station;
A roaming processing method comprising: a wireless communication step for performing authentication processing and registration processing for roaming with a wireless base station corresponding to the MAC address selected in the communication control step during the roaming . The roaming processing method according to claim 4, wherein
The communication control step receives, from the wireless base station, base station information indicating a wireless base station that can be a candidate when the wireless LAN terminal roams from the wireless base station to the other, and stores it in the storage unit. A roaming processing method comprising: preferentially selecting, from the storage unit, a MAC address of a radio base station corresponding to the base station information from the MAC addresses during new roaming. A wireless base for performing data communication by connecting to a wireless LAN terminal via a wireless channel and performing authentication processing and registration processing for roaming with the wireless LAN terminal when newly roaming with the wireless LAN terminal A station roaming processing method,
A storage step of storing in advance a base station information indicating a wireless base station that can be a roaming destination when the wireless LAN terminal roams from the wireless base station to another;
A roaming processing method comprising: a communication control step of reading the base station information from the storage unit and transmitting the information to the wireless LAN terminal when roaming with the wireless LAN terminal.

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