JP2004304570A - Roaming method in wireless lan system - Google Patents

Roaming method in wireless lan system Download PDF

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Publication number
JP2004304570A
JP2004304570A JP2003095890A JP2003095890A JP2004304570A JP 2004304570 A JP2004304570 A JP 2004304570A JP 2003095890 A JP2003095890 A JP 2003095890A JP 2003095890 A JP2003095890 A JP 2003095890A JP 2004304570 A JP2004304570 A JP 2004304570A
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Prior art keywords
wireless
wireless terminal
switching hub
access point
lan system
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JP2003095890A
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Japanese (ja)
Inventor
Junichi Edamatsu
順一 枝松
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Kanda Tsushin Kogyo Co Ltd
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Kanda Tsushin Kogyo Co Ltd
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Priority to JP2003095890A priority Critical patent/JP2004304570A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a roaming method in a wireless LAN system for avoiding packet loss. <P>SOLUTION: A wireless LAN system comprises a plurality of access points connected to a LAN cable via a switching hub and a plurality of wireless terminals wireless-connected to the access points. The switching hub comprises a MAC control table memorizing a MAC address of a wireless terminal associated with and wirelessly connected to a port corresponding to each access point for the switching hub. In the wireless LAN system, a second access point starting transmission with a wireless terminal in roaming sends an ARP packet to a communication partner with the wireless terminal on behalf of the wireless terminal, and the MAC address of the wireless terminal is deleted from a switching hub port corresponding section associated with an access point used before at the MAC control table in the switching hub upon receipt of response from the partner. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】本発明はＩＥＥＥ８０２．１１に準拠する無線ＬＡＮシステムにおいて、無線端末が現在無線接続されているアクセスポイントから移動して新たなアクセスポイントと無線接続する無線ＬＡＮシステムにおけるローミング方式に関する。
【０００２】
【従来の技術】現在の無線ＬＡＮにおける無線端末のローミングは、各無線端末が同一のＥＳＳＩＤを持っているアクセスポイントに対して行い、新たなアクセスポイントとの無線接続が可能になると、そのまま無線通信を継続していた。
【０００３】
【発明が解決しようとする課題】しかし上記のように、複数台のアクセスポイントをスイッチングハブ配下にて接続する構成とした場合、無線端末のＭＡＣアドレスは、接続したアクセスポイントが接続されているスイッチングハブのポートに対応して記憶される。そのため、データ通信中に無線端末がローミングを行うと通信していた相手からのパケットが従来接続していたアクセスポイント側のポートに転送されるため通信中の相手からのパケットがロスしてしまう。
【０００４】本発明の目的は、この従来の欠点を解消した無線ＬＡＮシステムにおけるローミング方式を提供することにある。
【０００５】
【課題を解決するための手段】この目的を達成するため、本発明の構成を以下のようにした。
ＬＡＮケーブルにスイッチングハブを介し複数のアクセスポイントを接続し、前記アクセスポイントと複数の無線端末とが無線接続を行う無線ＬＡＮシステムにおいて、前記スイッチングハブには前記スイッチングハブ各々のポートに対応して無線接続している無線端末のＭＡＣアドレスを記憶するＭＡＣ管理テーブルを備え、第１のアクセスポイントを介しデータ通信中の無線端末が移動し第２のアクセスポイントに接続開始すると、第２のアクセスポイントが当該無線端末の代理でＡＲＰパケットを無線端末が通信していた相手に送り、その相手からの応答により前記スイッチングハブのＭＡＣ管理テーブルにおいて第１のアクセスポイントに対応する前記スイッチングハブのポート対応部分から当該無線端末のＭＡＣアドレスが削除される無線ＬＡＮシステムにおけるローミング方式。
【０００６】
【発明の実施の形態】図１は本発明の実施例である無線ＬＡＮシステムである。図２はアクセスポイントの構成図である。図３はスイッチングハブに備えるポート対応のＭＡＣ管理テーブルを示す図である。
【０００７】１はＷＥＢ、２はスイッチングハブ、２１，２２，２３，２４はアクセスポイントに対応するスイッチングハブ２のポート、２５はＬＡＮケーブル６と上記ポート又はポート同士の接続制御他を行う制御部、２６はＭＡＣ管理テーブルである。３１，３２，３３はアクセスポイント、４１、４２，４３はアクセスポイント各々のサービスエリア、５は一台の無線端末、６はＬＡＮケーブルである。アクセスポイント３１、３２，３３は同一構成であるため代表としてアクセスポイント３１で構成を説明する。３１１はアクセスポイント３１の有線送受信部、３１２はＡＲＰパケットを送出する等制御を行う制御部、３１３は無線送受信部、３１４は記億部、３１５は無線子機と通信を行うアンテナである。
【０００８】
まず、無線端末５がＷＥＢ１に接続される動作を説明する。図１において、アクセスポイント３１、３２、３３は同一のＥＳＳＩＤが設定されているものとする。
無線端末５は、アクセスポイント３１のビーコン信号を受け接続要求を行う。するとスイッチングハブ２のポート２１に接続されているアクセスポイント３１から制御部２５によりＬＡＮケーブル６を介しＷＥＢ１に接続される。そして、制御部２５は図３に示すＭＡＣア管理テーブル２６に、スイッチングハブのポートに対応して無線子機のＭＡＣアドレスを記憶する。そのことで通信先からのパケットが制御部２５の制御によりＭＡＣア管理テーブルから行き先であるアクセスポイント３１及び無線端末５まで到達することができる。このようにして、無線端末５はＷＥＢ１を介した相手又は他のアクセスポイントを介した無線端末に接続することができる。
【０００９】
次にローミングについて説明を行う。無線端末５がアクセスポイント３１を介しＷＥＢ１を介しデータ通信を行っていたときにアクセスポイント３２のサービスエリアへ移動したとする。無線端末５はアクセスポイント３２に接続要求のパケットを送る。するとアクセスポイント３２は、無線端末５からの通信相手先情報を得て、無線端末５の代理としてＡＲＰパケットを送り出す。するとスイッチングハブのポート２２から無線端末５のＷＥＢ１を介した通信相手にパケットが届けられる。通信相手が応答しパケットを送り返してくると、ＬＡＮケーブル６を介してスイッチングハブ２の制御部２５がこれを受けＭＡＣ管理テーブル１６からアクセスポイント３１すなわちスイッチングハブのポート２１に対応する無線端末５のＭＡＣアドレスを消去する。そしてスイッチングハブ２の制御部２５は、ＭＡＣ管理テーブル２６にアクセスポイント３２すなわちスイッチングハブのポート対応に無線端末５のＭＡＣアドレスを記憶する。その結果、無線端末５のＭＡＣアドレスはＭＡＣ管理テーブル２６においてアクセスポイント３１対応のポート２１に存在せず、アクセスポイント３２対応のポート２２にのみ存在するようになる。そのため無線端末５に到来するパッケトのロスが発生することはない。
【００１０】
【発明の効果】以上のように、スイッチングハブにはＭＡＣアドレスの学習機能があるため、ＭＡＣ管理テーブルがリフレッシュされる。そのためパケットロスを回避することができる。
【図面の簡単な説明】
【図１】本発明の実施例である無線ＬＡＮシステム
【図２】アクセスポイントの構成図
【図３】スイッチングハブに備えるＭＡＣ管理テーブルを示す図
【符号の説明】
１ ＷＥＢ
２ スイッチングハブ
２１、２２、２３、２４ スイッチングハブのポート
２５ 制御部
２６ ＭＡＣ管理テーブル
３１、３２、３３ アクセスポイント
４１、４２、４３ サービスエリア
５ 無線端末
６ ＬＡＮケーブル
３１１ 有線送受信部
３１２ 制御部
３１３ 無線送受信部
３１４ 記億部
３１５ アンテナ[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roaming method in a wireless LAN system in which a wireless terminal moves from an access point currently wirelessly connected and wirelessly connects to a new access point in a wireless LAN system conforming to IEEE 802.11. About.
[0002]
2. Description of the Related Art Roaming of wireless terminals in a current wireless LAN is performed for access points having the same ESSID, and when wireless connection with a new access point becomes possible, wireless communication is performed as it is. Was continuing.
[0003]
However, as described above, when a plurality of access points are connected under the switching hub, the MAC address of the wireless terminal becomes the switching address to which the connected access point is connected. It is stored corresponding to the port of the hub. Therefore, if the wireless terminal roams during data communication, the packet from the communicating party is transferred to the port on the access point side to which the communication has been conventionally connected, so that the packet from the communicating party is lost.
An object of the present invention is to provide a roaming method in a wireless LAN system which has solved the conventional disadvantage.
[0005]
Means for Solving the Problems To achieve this object, the configuration of the present invention is as follows.
In a wireless LAN system in which a plurality of access points are connected to a LAN cable via a switching hub and the access point and a plurality of wireless terminals make a wireless connection, the switching hub has a wireless connection corresponding to each port of the switching hub. A MAC management table that stores a MAC address of a connected wireless terminal; a wireless terminal performing data communication via the first access point moves and starts connecting to the second access point; The ARP packet is sent to the other party with which the wireless terminal was communicating on behalf of the wireless terminal, and a response from the other party sends the ARP packet from the port corresponding portion of the switching hub corresponding to the first access point in the MAC management table of the switching hub. The MAC address of the wireless terminal is deleted Roaming method in a wireless LAN system that.
[0006]
FIG. 1 shows a wireless LAN system according to an embodiment of the present invention. FIG. 2 is a configuration diagram of the access point. FIG. 3 is a diagram showing a MAC management table corresponding to a port provided in the switching hub.
[0007] 1 is a WEB, 2 is a switching hub, 21, 22, 23, and 24 are ports of the switching hub 2 corresponding to an access point, and 25 is a control unit for controlling connection between the LAN cable 6 and the above-mentioned ports or between ports, and the like. , 26 are MAC management tables. Reference numerals 31, 32, and 33 denote access points, 41, 42, and 43 denote service areas of the access points, 5 denotes one wireless terminal, and 6 denotes a LAN cable. Since the access points 31, 32, and 33 have the same configuration, the configuration of the access point 31 will be described as a representative. Reference numeral 311 denotes a wired transmission / reception unit of the access point 31; 312, a control unit for performing control such as transmission of an ARP packet; 313, a wireless transmission / reception unit; 314, a storage unit; and 315, an antenna for communicating with a wireless client.
[0008]
First, an operation in which the wireless terminal 5 is connected to the WEB 1 will be described. In FIG. 1, it is assumed that the same ESSID is set for the access points 31, 32, and 33.
The wireless terminal 5 receives the beacon signal of the access point 31 and makes a connection request. Then, the access point 31 connected to the port 21 of the switching hub 2 is connected to the WEB 1 by the control unit 25 via the LAN cable 6. Then, the control unit 25 stores the MAC address of the wireless client device in the MAC address management table 26 shown in FIG. 3 corresponding to the port of the switching hub. Thus, the packet from the communication destination can reach the destination access point 31 and the wireless terminal 5 from the MAC address management table under the control of the control unit 25. In this manner, the wireless terminal 5 can be connected to a partner via the WEB 1 or a wireless terminal via another access point.
[0009]
Next, roaming will be described. It is assumed that the wireless terminal 5 has moved to the service area of the access point 32 while performing data communication via the access point 31 and the WEB 1. The wireless terminal 5 sends a connection request packet to the access point 32. Then, the access point 32 obtains communication partner information from the wireless terminal 5 and sends out an ARP packet on behalf of the wireless terminal 5. Then, the packet is delivered from the port 22 of the switching hub to the communication partner via the WEB 1 of the wireless terminal 5. When the communication partner responds and sends back the packet, the control unit 25 of the switching hub 2 receives the packet via the LAN cable 6 and receives from the MAC management table 16 the access point 31, that is, the wireless terminal 5 corresponding to the port 21 of the switching hub. Delete the MAC address. Then, the control unit 25 of the switching hub 2 stores the MAC address of the wireless terminal 5 in the MAC management table 26 corresponding to the access point 32, that is, the port of the switching hub. As a result, the MAC address of the wireless terminal 5 does not exist in the port 21 corresponding to the access point 31 in the MAC management table 26, but exists only in the port 22 corresponding to the access point 32. Therefore, the loss of the packet arriving at the wireless terminal 5 does not occur.
[0010]
As described above, since the switching hub has the function of learning the MAC address, the MAC management table is refreshed. Therefore, packet loss can be avoided.
[Brief description of the drawings]
FIG. 1 is a wireless LAN system according to an embodiment of the present invention. FIG. 2 is a configuration diagram of an access point. FIG. 3 is a diagram showing a MAC management table provided in a switching hub.
1 WEB
2 Switching hubs 21, 22, 23, 24 Switching hub ports 25 Control unit 26 MAC management tables 31, 32, 33 Access points 41, 42, 43 Service area 5 Wireless terminal 6 LAN cable 311 Wired transmission / reception unit 312 Control unit 313 Wireless Transmission / reception unit 314 Storage unit 315 Antenna

Claims (1)

ＬＡＮケーブルにスイッチングハブを介し複数のアクセスポイントを接続し、前記アクセスポイントと複数の無線端末とが無線接続を行う無線ＬＡＮシステムにおいて、前記スイッチングハブには前記スイッチングハブ各々のポートに対応して無線接続している無線端末のＭＡＣアドレスを記憶するＭＡＣ管理テーブルを備え、第１のアクセスポイントを介しデータ通信中の無線端末が移動し第２のアクセスポイントに接続開始すると、第２のアクセスポイントが当該無線端末の代理でＡＲＰパケットを無線端末が通信していた相手に送り、その相手からの応答により前記スイッチングハブのＭＡＣ管理テーブルにおいて第１のアクセスポイントに対応する前記スイッチングハブのポート対応部分から当該無線端末のＭＡＣアドレスが削除されることを特徴とした無線ＬＡＮシステムにおけるローミング方式。In a wireless LAN system in which a plurality of access points are connected to a LAN cable via a switching hub and the access point and a plurality of wireless terminals make a wireless connection, the switching hub has a wireless connection corresponding to each port of the switching hub. A MAC management table that stores a MAC address of a connected wireless terminal; a wireless terminal performing data communication via the first access point moves and starts connecting to the second access point; The ARP packet is sent to the other party with which the wireless terminal was communicating on behalf of the wireless terminal, and a response from the other party sends the ARP packet from the port corresponding portion of the switching hub corresponding to the first access point in the MAC management table of the switching hub. The MAC address of the wireless terminal is deleted Roaming method in a wireless LAN system, wherein Rukoto.
JP2003095890A 2003-03-31 2003-03-31 Roaming method in wireless lan system Pending JP2004304570A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007124348A (en) * 2005-10-28 2007-05-17 Oki Electric Ind Co Ltd Access point device and communication system
CN100452743C (en) * 2006-09-14 2009-01-14 杭州华三通信技术有限公司 Method and system for expanding 802.11 radio local network
JP2012054961A (en) * 2005-03-25 2012-03-15 Alcatel-Lucent Usa Inc Method and apparatus for seamless roaming for wireless networks
CN101572668B (en) * 2009-05-21 2012-10-10 中兴通讯股份有限公司 Method for deleting MAC addresses and device therefor
KR101197281B1 (en) 2011-02-22 2012-11-05 세종대학교산학협력단 Integarated mobility management server and method for supporting mobility in the network management system based on wireless communication network
JPWO2013183645A1 (en) * 2012-06-04 2016-02-01 国立大学法人 東京大学 Wireless network equipment
JP2020198519A (en) * 2019-05-31 2020-12-10 アイコム株式会社 Wireless relay device and wireless lan system using the same and wireless relay method

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012054961A (en) * 2005-03-25 2012-03-15 Alcatel-Lucent Usa Inc Method and apparatus for seamless roaming for wireless networks
JP2007124348A (en) * 2005-10-28 2007-05-17 Oki Electric Ind Co Ltd Access point device and communication system
JP4710549B2 (en) * 2005-10-28 2011-06-29 沖電気工業株式会社 Access point device, communication system, access point device control method and communication control method
US8619703B2 (en) 2005-10-28 2013-12-31 Oki Electric Industry Co., Ltd. Access point device and a communications system for effectively using a proxy ARP function
CN100452743C (en) * 2006-09-14 2009-01-14 杭州华三通信技术有限公司 Method and system for expanding 802.11 radio local network
CN101572668B (en) * 2009-05-21 2012-10-10 中兴通讯股份有限公司 Method for deleting MAC addresses and device therefor
KR101197281B1 (en) 2011-02-22 2012-11-05 세종대학교산학협력단 Integarated mobility management server and method for supporting mobility in the network management system based on wireless communication network
JPWO2013183645A1 (en) * 2012-06-04 2016-02-01 国立大学法人 東京大学 Wireless network equipment
JP2020198519A (en) * 2019-05-31 2020-12-10 アイコム株式会社 Wireless relay device and wireless lan system using the same and wireless relay method
JP7311757B2 (en) 2019-05-31 2023-07-20 アイコム株式会社 Wireless relay device, wireless LAN system using the same, and wireless relay method

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