JP2009089282A - Wireless lan communication system, controller device, wireless lan base station, and wireless lan communication method using them - Google Patents

Wireless lan communication system, controller device, wireless lan base station, and wireless lan communication method using them Download PDF

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JP2009089282A
JP2009089282A JP2007259312A JP2007259312A JP2009089282A JP 2009089282 A JP2009089282 A JP 2009089282A JP 2007259312 A JP2007259312 A JP 2007259312A JP 2007259312 A JP2007259312 A JP 2007259312A JP 2009089282 A JP2009089282 A JP 2009089282A
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wireless lan
base station
incoming call
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Shinsuke Shioda
真祐 塩田
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NEC Platforms Ltd
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NEC Infrontia Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless LAN communication method capable of preventing a sender from immediately disconnecting an incoming call even when a wireless LAN terminal from which the incoming call is generated is disconnected for the purpose of restricting the number of calls by a wireless LAN base station. <P>SOLUTION: In the wireless LAN communication system restricting the number of calls of a wireless LAN terminal 6 housed in the wireless LAN base station (#1) 4-1, a controller 2 managing the wireless LAN base station (#1) 4-1 and the wireless LAN terminal 6 executes a process of making a surrogate reply to a PBX 1 for the incoming call to the wireless LAN terminal 6 until the wireless LAN terminal 6 becomes an object to be restricted in the number of calls is allowed to reply. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は無線ＬＡＮ通信システム、コントローラ装置、無線ＬＡＮ基地局及びそれらに用いる無線ＬＡＮ通信方法に関し、特に切断された無線ＬＡＮ（Ｌｏｃａｌ Ａｒｅａ Ｎｅｔｗｏｒｋ）端末への呼が着信呼であった場合の無線ＬＡＮ通信方法に関する。   The present invention relates to a wireless LAN communication system, a controller device, a wireless LAN base station, and a wireless LAN communication method used therefor, and in particular, a wireless LAN when a call to a disconnected wireless LAN (Local Area Network) terminal is an incoming call. It relates to a communication method.

本発明に関連する無線ＬＡＮ基地局については、ＩＥＥＥ（Ｉｎｓｔｉｔｕｔｅ ｏｆ Ｅｌｅｃｔｒｉｃａｌ ａｎｄ Ｅｌｅｃｔｒｏｎｉｃ Ｅｎｇｉｎｅｅｒｓ）８０２．１１に規定されており、ＶＯＩＰ（Ｖｏｉｃｅ Ｏｖｅｒ Ｉｎｔｅｒｎｅｔ Ｐｒｏｔｏｃｏｌ）音声通話を収容する際、他の無線ＬＡＮ端末の帯域があふれたり、他の無線ＬＡＮ端末のＶＯＩＰ通話数が許容量を超えた場合、通話品質の低下を防ぐ目的で新たなＶＯＩＰ通話の発生を防止するため、無線ＬＡＮ端末を帰属させないことで既存の通話品質を確保している。   The wireless LAN base station related to the present invention is defined in IEEE (Institut of Electrical and Electronic Engineers) 802.11, and when accommodating a VoIP (Voice Over Internet Protocol) voice communication, In order to prevent the occurrence of new VOIP calls in order to prevent the deterioration of the call quality when the bandwidth overflows or the number of VOIP calls of other wireless LAN terminals exceeds the allowable amount, existing wireless LAN terminals do not belong. Ensures call quality.

しかしながら、既に無線ＬＡＮ基地局に帰属している無線ＬＡＮ端末が通話を開始しようとすると、ＶＯＩＰ通話が増加することで無線ＬＡＮの帯域使用率が増大するため、既存のＶＯＩＰ通話の通話品質が低下してしまう。この問題に対し、無線ＬＡＮ基地局では、通話を行った、または行おうとする無線ＬＡＮ端末を切断することでＶＯＩＰ通話の増加を防止している。   However, when a wireless LAN terminal already belonging to a wireless LAN base station tries to start a call, the VOIP call increases and the wireless LAN bandwidth usage increases, so the call quality of the existing VOIP call decreases. Resulting in. In response to this problem, the wireless LAN base station prevents an increase in VOIP calls by disconnecting wireless LAN terminals that have made or attempted to make a call.

また、切断された無線ＬＡＮ端末の呼が着信呼であった場合、無線ＬＡＮ端末が別の無線ＬＡＮ基地局へ帰属して、着信呼のパケットを受信できるようになるまで時間が掛かると、ＰＢＸ（Ｐｒｉｖａｔｅ Ｂｒａｎｃｈ ｅＸｃｈａｎｇｅ）側で発信をタイムアウトさせてしまい、着信が再開しなくなるという問題がある。   In addition, when the call of the disconnected wireless LAN terminal is an incoming call, if it takes time until the wireless LAN terminal belongs to another wireless LAN base station and can receive an incoming call packet, PBX There is a problem that the outgoing call is timed out on the (Private Branch eXchange) side and the incoming call does not resume.

一般的に、ＳＩＰ（Ｓｅｓｓｉｏｎ Ｉｎｉｔｉａｔｉｏｎ Ｐｒｏｔｏｃｏｌ）において、着信側が応答パケットを返さない場合の発信者側のタイムアウトは合計して３２秒と推奨されているが、ほとんどのＰＢＸでは、無線ＬＡＮ端末が圏外であった場合のタイムアウトが数秒と短く定義されている。   Generally, in SIP (Session Initiation Protocol), it is recommended that the timeout on the caller side is 32 seconds in total when the callee does not return a response packet. However, in most PBXs, the wireless LAN terminal is out of service area. The timeout is defined as short as a few seconds.

このため、無線ＬＡＮ基地局が通話数を制限する目的で、着信呼が発生した無線ＬＡＮ端末を切断した場合、無線ＬＡＮ端末が別の無線ＬＡＮ基地局に帰属した後でも着信が再開せず、着信呼を破棄（Ｄｒｏｐ）してしまうという問題が見られる。   For this reason, when the wireless LAN base station disconnects the wireless LAN terminal in which the incoming call has occurred for the purpose of limiting the number of calls, the incoming call does not resume even after the wireless LAN terminal belongs to another wireless LAN base station, There is a problem that the incoming call is dropped.

尚、本発明に関連する技術としては、下記の特許文献に記載の技術がある。
特開２００５−３１８３４４号公報 特開２０００−３４１４１４号公報 In addition, as a technique relevant to this invention, there exists a technique described in the following patent document.
JP 2005-318344 A JP 2000-341414 A

本発明に関連する無線ＬＡＮ基地局では、ＶＯＩＰ通話数やデータの帯域が許容量を超えた場合、データの帯域を絞り、新たなＶＯＩＰ通話を行った無線ＬＡＮ端末を切断することで既存の通話品質を確保している。   In the wireless LAN base station related to the present invention, when the number of VOIP calls and the data bandwidth exceed the allowable amount, the existing bandwidth is reduced by narrowing the data bandwidth and disconnecting the wireless LAN terminal that has made a new VOIP call. Quality is ensured.

切断された無線ＬＡＮ端末は、別の無線ＬＡＮ基地局に帰属する。無線ＬＡＮ基地局が新たなＶＯＩＰ通話を行った無線ＬＡＮ端末を切断する際、ＶＯＩＰ通話が無線ＬＡＮ端末からの発信であった場合、発信失敗が即座に使用者に判断できる。   The disconnected wireless LAN terminal belongs to another wireless LAN base station. When the wireless LAN base station disconnects the wireless LAN terminal that has made a new VOIP call, if the VOIP call is a call from the wireless LAN terminal, the user can immediately determine that the call has failed.

しかしながら、この場合には、ＶＯＩＰ通話が無線ＬＡＮ端末への着信であり、無線ＬＡＮ端末がＰＢＸが定める発信のタイムアウト時間までに何れの無線ＬＡＮ基地局にも帰属できず、ＶＯＩＰ着信を再開することができなかった場合、無線ＬＡＮ端末へ発信した発信者において、無線ＬＡＮ端末が話中状態であるとみなされ、通話が切断されてしまう。この時、ＰＢＸも、無線ＬＡＮ端末が着信呼のパケットの再送もほとんど行わず、短い時間で無線ＬＡＮ端末がビジー状態であると判断する場合も多い。   However, in this case, the VOIP call is an incoming call to the wireless LAN terminal, and the wireless LAN terminal cannot be attributed to any wireless LAN base station by the time-out time for outgoing call determined by the PBX, and the VOIP incoming call is resumed. If the call cannot be made, the caller who has sent the call to the wireless LAN terminal is considered to be in a busy state and the call is disconnected. At this time, the PBX also often determines that the wireless LAN terminal is busy in a short time, with the wireless LAN terminal hardly retransmitting the incoming call packet.

また、無線ＬＡＮ基地局またはコントローラが無線ＬＡＮ端末の無線ＬＡＮ帰属状態を管理し、ＰＢＸへ通知する通信方法もあるが、無線ＬＡＮ基地局の他、独自の改造を施した専用の無線ＬＡＮ端末またはＰＢＸが必要となる。   In addition, there is a communication method in which the wireless LAN base station or the controller manages the wireless LAN belonging state of the wireless LAN terminal and notifies the PBX, but in addition to the wireless LAN base station, a dedicated wireless LAN terminal that has been uniquely modified or PBX is required.

さらに、無線ＬＡＮ基地局またはコントローラが無線ＬＡＮ端末の無線ＬＡＮ帰属状態を管理し、ＰＢＸへ通知する通信方法をとった場合には、単一のＰＢＸとコントローラとの組み合わせしか提供できなくなる。このため、無線ＬＡＮ基地局に複数のＰＢＸシステムのＶＯＩＰ通話が存在する場合、通話数制限を提供することができない。   Furthermore, when the wireless LAN base station or the controller manages the wireless LAN belonging state of the wireless LAN terminal and uses the communication method of notifying the PBX, only a combination of a single PBX and the controller can be provided. For this reason, when there are a plurality of VOIP calls of the PBX system in the wireless LAN base station, it is not possible to provide a call number limit.

さらにまた、エリア内の全ての無線ＬＡＮ基地局が通話数制限を行っている状態で、新たな発信呼または着信呼を有する無線ＬＡＮ端末を何れかの無線ＬＡＮ基地局で管理し、それをＰＢＸへ通知する通信方法もあるが、無線ＬＡＮ基地局の他、独自の改造を施した専用の無線ＬＡＮ端末またはＰＢＸが必要となる。   Furthermore, in a state where all the wireless LAN base stations in the area are limiting the number of calls, a wireless LAN terminal having a new outgoing call or incoming call is managed by any of the wireless LAN base stations, and the PBX is managed. Although there is a communication method for notifying to a wireless LAN base station, a dedicated wireless LAN terminal or PBX with its own modification is required in addition to the wireless LAN base station.

そこで、本発明の目的は上記の問題点を解消し、無線ＬＡＮ基地局が通話数を制限する目的で、着信呼が発生した無線ＬＡＮ端末を切断した場合でも、発信者が直ちに着信呼を切断することを防止することができる無線ＬＡＮ通信システム、コントローラ装置、無線ＬＡＮ基地局及びそれらに用いる無線ＬＡＮ通信方法を提供することにある。   Accordingly, an object of the present invention is to solve the above-mentioned problems, and even if the wireless LAN base station disconnects the wireless LAN terminal from which an incoming call has occurred in order to limit the number of calls, the caller immediately disconnects the incoming call. It is an object of the present invention to provide a wireless LAN communication system, a controller device, a wireless LAN base station, and a wireless LAN communication method used for them.

本発明による無線ＬＡＮ通信システムは、無線ＬＡＮ（Ｌｏｃａｌ Ａｒｅａ Ｎｅｔｗｏｒｋ）基地局へ収容される無線ＬＡＮ端末の通話数の制限を行う無線ＬＡＮ通信システムであって、
前記通話数の制限の対象となる無線ＬＡＮ端末が応答できるようになるまで当該無線ＬＡＮ端末への着信呼に対して代理応答を行う手段を備えている。 A wireless LAN communication system according to the present invention is a wireless LAN communication system that limits the number of calls of wireless LAN terminals accommodated in a wireless LAN (Local Area Network) base station,
Means is provided for performing a proxy response to an incoming call to the wireless LAN terminal until the wireless LAN terminal subject to restriction on the number of calls can respond.

本発明によるコントローラ装置は、上記の無線ＬＡＮ通信システムの手段を有することを特徴とする。   A controller device according to the present invention includes the above-described wireless LAN communication system.

本発明による無線ＬＡＮ基地局は、上記の無線ＬＡＮ通信システムの手段を有することを特徴とする。   A wireless LAN base station according to the present invention comprises the means of the wireless LAN communication system described above.

本発明による無線ＬＡＮ通信方法は、無線ＬＡＮ（Ｌｏｃａｌ Ａｒｅａ Ｎｅｔｗｏｒｋ）基地局へ収容される無線ＬＡＮ端末の通話数の制限を行う無線ＬＡＮ通信システムに用いる無線ＬＡＮ通信方法であって、
前記無線ＬＡＮ基地局及び前記無線ＬＡＮ端末を管理するコントローラ装置が、前記通話数の制限の対象となる無線ＬＡＮ端末が応答できるようになるまで当該無線ＬＡＮ端末への着信呼に対して代理応答を行う処理を実行している。 A wireless LAN communication method according to the present invention is a wireless LAN communication method used in a wireless LAN communication system for limiting the number of calls of wireless LAN terminals accommodated in a wireless LAN (Local Area Network) base station.
The controller device that manages the wireless LAN base station and the wireless LAN terminal sends a proxy response to an incoming call to the wireless LAN terminal until the wireless LAN terminal subject to the restriction on the number of calls can respond. The process to be performed is being executed.

本発明は、上記のような構成及び動作とすることで、無線ＬＡＮ基地局が通話数を制限する目的で、着信呼が発生した無線ＬＡＮ端末を切断した場合でも、発信者が直ちに着信呼を切断することを防止することができるという効果が得られる。   The present invention is configured and operated as described above, so that even if the wireless LAN base station disconnects the wireless LAN terminal from which the incoming call has occurred for the purpose of limiting the number of calls, the caller immediately makes an incoming call. The effect that it can prevent cutting is acquired.

次に、本発明の実施の形態について図面を参照して説明する。図１は本発明の第１の実施の形態による無線ＬＡＮ（Ｌｏｃａｌ Ａｒｅａ Ｎｅｔｗｏｒｋ）通信システムの構成例を示すブロック図である。図１において、本発明の第１の実施の形態による無線ＬＡＮ通信システムは、ＰＢＸ（Ｐｒｉｖａｔｅ Ｂｒａｎｃｈ ｅＸｃｈａｎｇｅ）１と、コントローラ２と、ルータ（＃１，＃２）３−１，３−２と、無線ＬＡＮ基地局（＃１〜＃３）４−１〜４−３と、無線ＬＡＮ端末群５と、無線ＬＡＮ端末６とから構成されている。   Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of a wireless LAN (Local Area Network) communication system according to a first embodiment of the present invention. In FIG. 1, a wireless LAN communication system according to the first embodiment of the present invention includes a PBX (Private Branch eXchange) 1, a controller 2, routers (# 1, # 2) 3-1, 3-2, Wireless LAN base stations (# 1 to # 3) 4-1 to 4-3, a wireless LAN terminal group 5, and a wireless LAN terminal 6 are configured.

ここで、ルータ（＃１，＃２）３−１，３−２はＬ３（レイヤ３）スイッチでもよい。また、図１において、１０１は無線ＬＡＮ基地局（＃１）４−１と無線ＬＡＮ端末群５及び無線ＬＡＮ端末６とを接続する無線通信路、１０２はルータ（＃１）３−１と無線ＬＡＮ基地局（＃１，＃２）４−１，４−２とを接続する通信路である。無線ＬＡＮ端末群５は既に通話を行っている複数の端末であり、無線ＬＡＮ端末６は新たな着信通話を行おうとしている端末である。   Here, the routers (# 1, # 2) 3-1 and 3-2 may be L3 (layer 3) switches. In FIG. 1, reference numeral 101 denotes a wireless communication path connecting the wireless LAN base station (# 1) 4-1 to the wireless LAN terminal group 5 and the wireless LAN terminal 6, and 102 denotes wireless communication with the router (# 1) 3-1. This is a communication path for connecting the LAN base stations (# 1, # 2) 4-1, 4-2. The wireless LAN terminal group 5 is a plurality of terminals that have already made calls, and the wireless LAN terminal 6 is a terminal that is about to make a new incoming call.

無線ＬＡＮ基地局（＃１）４−１は無線ＬＡＮ端末群５及び無線ＬＡＮ端末６を収容し、現在、無線ＬＡＮ端末群５によって通話数があふれている基地局であり、無線ＬＡＮ基地局（＃２）４−２は無線ＬＡＮ端末６が次に帰属するであろう基地局であり、無線ＬＡＮ基地局（＃３）４−３は無線ＬＡＮ端末６が次に帰属するであろうサブネット外の基地局である。   The wireless LAN base station (# 1) 4-1 accommodates the wireless LAN terminal group 5 and the wireless LAN terminal 6, and is a base station where the number of calls is currently overflowing by the wireless LAN terminal group 5, and the wireless LAN base station ( # 2) 4-2 is a base station to which the wireless LAN terminal 6 will belong next, and a wireless LAN base station (# 3) 4-3 is outside the subnet to which the wireless LAN terminal 6 will belong next. Base station.

図２は図１のコントローラ２及び無線ＬＡＮ基地局（＃１）４−１の構成例を示すブロック図である。図２において、コントローラ２は、ＩＥＥＥ８０２．３ Ｅｔｈｅｒｎｅｔ（登録商標）インタフェース（以下、ＬＡＮ Ｉ／Ｆ部とする）２１と、トーキ送出部２２と、帰属情報管理部２３と、帰属情報テーブル２４と、ＡＰ（Ａｃｃｅｓｓ Ｐｏｉｎｔ）テーブル２５と、パケット変換部２６と、呼処理解析部２７と、ログ保存部２８と、アラーム表示部２９とを備えている。   FIG. 2 is a block diagram showing a configuration example of the controller 2 and the wireless LAN base station (# 1) 4-1 in FIG. 2, the controller 2 includes an IEEE 802.3 Ethernet (registered trademark) interface (hereinafter referred to as a LAN I / F unit) 21, a token transmission unit 22, an attribution information management unit 23, an attribution information table 24, An AP (Access Point) table 25, a packet conversion unit 26, a call processing analysis unit 27, a log storage unit 28, and an alarm display unit 29 are provided.

無線ＬＡＮ基地局（＃１）４−１は、パケットフィルタ部４１と、ＬＡＮ Ｉ／Ｆ部４２と、パケット変換部４３と、ＡＲＰ（Ａｄｄｒｅｓｓ Ｒｅｓｏｌｕｔｉｏｎ Ｐｒｏｔｏｃｏｌ）解析部４４と、ＡＲＰテーブル４５と、ＩＥＥＥ８０２．１１インタフェース（以下、８０２．１１ Ｉ／Ｆ部とする）４６とを備えている。尚、無線ＬＡＮ基地局（＃２，＃３）４−２，４−３は上記の無線ＬＡＮ基地局（＃１）４−１と同様の構成とする。   The wireless LAN base station (# 1) 4-1 includes a packet filter unit 41, a LAN I / F unit 42, a packet conversion unit 43, an ARP (Address Resolution Protocol) analysis unit 44, an ARP table 45, and IEEE 802. .11 interface (hereinafter, referred to as 802.11 I / F unit) 46. The wireless LAN base stations (# 2, # 3) 4-2 and 4-3 have the same configuration as the wireless LAN base station (# 1) 4-1.

図３は図２の帰属テーブル２４の構成例を示す図である。図３において、帰属テーブル２４は「端末ＭＡＣ（Ｍｅｄｉａ Ａｃｃｅｓｓ Ｃｏｎｔｒｏｌ）アドレス」、「呼状態（０：空き、１：通話中）」、「着信呼のパケットのペイロード」を保持しており、ＡＰテーブル２５は基地局ＳＳＩＤ（Ｓｅｒｖｉｃｅ Ｓｅｔ ＩＤｅｎｔｉｆｉｅｒ）」、「ＥＳＳＩＤ（Ｅｘｔｅｎｄｅｄ Ｓｅｒｖｉｃｅ Ｓｅｔ ＩＤｅｎｔｉｆｉｅｒ）」を保持している。   FIG. 3 is a diagram showing a configuration example of the attribution table 24 of FIG. In FIG. 3, the attribution table 24 holds “terminal MAC (Media Access Control) address”, “call state (0: free, 1: busy)”, “payload of incoming call packet”, and AP table. 25 holds a base station SSID (Service Set IDentifier) and “ESSID (Extended Service Set IDentifier)”.

図４は本発明の第１の実施の形態における呼状態情報を示す図である。図４において、呼状態情報Ａは、「端末ＭＡＣアドレス」、「送信元ＩＰ（Ｉｎｔｅｒｎｅｔ Ｐｒｏｔｏｃｏｌ）アドレス」、「送信先ＩＰアドレス」、「着信呼のパケットのペイロード」からなる。   FIG. 4 is a diagram showing call state information in the first exemplary embodiment of the present invention. In FIG. 4, the call state information A includes “terminal MAC address”, “source IP (Internet Protocol) address”, “destination IP address”, and “payload of incoming call packet”.

図５は本発明の第１の実施の形態における呼状態継続可否を示す図である。図４において、呼状態継続可否Ｂは、「呼状態継続可否（０：可、１：不可）」からなる。   FIG. 5 is a diagram showing whether or not the call state can be continued according to the first embodiment of this invention. In FIG. 4, the call state continuation propriety B is made up of “call state continuation propriety (0: acceptable, 1: impossible)”.

図６は図１のコントローラ２が無線ＬＡＮ基地局（＃１）４−１に対して無線ＬＡＮ端末６を切断する旨を通知する際の動作を示すシーケンスチャートであり、図７は本発明の第１の実施の形態による無線ＬＡＮ通信システムの動作を示すタイムチャートであり、図８は本発明の第１の実施の形態による無線ＬＡＮ通信システムにおける端末帰属時の動作を示すシーケンスチャートである。これら図１〜図８を参照して本発明の第１の実施の形態による無線ＬＡＮ通信システムの動作について説明する。   FIG. 6 is a sequence chart showing an operation when the controller 2 of FIG. 1 notifies the wireless LAN base station (# 1) 4-1 that the wireless LAN terminal 6 is disconnected, and FIG. FIG. 8 is a time chart showing an operation of the wireless LAN communication system according to the first embodiment, and FIG. 8 is a sequence chart showing an operation when a terminal belongs in the wireless LAN communication system according to the first embodiment of the present invention. The operation of the wireless LAN communication system according to the first embodiment of the present invention will be described with reference to FIGS.

無線ＬＡＮ基地局（＃１）４−１は、無線ＬＡＮ端末６を収容する８０２．１１ Ｉ／Ｆ部４６と、ＰＢＸ１及びコントローラ２との通信を実現するＬＡＮ Ｉ／Ｆ部４２とを有し、無線ＬＡＮ端末６が帰属すると、コントローラ２へ帰属情報を通知する。   The wireless LAN base station (# 1) 4-1 includes an 802.11 I / F unit 46 that accommodates the wireless LAN terminal 6, and a LAN I / F unit 42 that realizes communication with the PBX 1 and the controller 2. When the wireless LAN terminal 6 belongs, the controller 2 is notified of the belonging information.

コントローラ２は、無線ＬＡＮ基地局（＃１）４−１から帰属情報を受信した際、ＡＰテーブル２５から情報を検索し、無線ＬＡＮ基地局（＃１）４−１の帰属情報テーブル２４に無線ＬＡＮ端末６のＭＡＣアドレスと呼状態とからなる帰属情報を保存する（図３参照）。   When the controller 2 receives the attribution information from the wireless LAN base station (# 1) 4-1, the controller 2 retrieves the information from the AP table 25 and wirelessly stores it in the attribution information table 24 of the wireless LAN base station (# 1) 4-1. The attribution information consisting of the MAC address of the LAN terminal 6 and the call state is stored (see FIG. 3).

無線ＬＡＮ基地局（＃１）４−１は、現在収容されている無線ＬＡＮ端末６が発信を行うか、ＰＢＸ１から着信呼のパケットが到着した際（図６のａ２）、パケットを即座に無線ＬＡＮ端末６へ送信せず、呼状態情報をコントローラ２に送信する（図６のａ３）。   The wireless LAN base station (# 1) 4-1 immediately transmits a packet when the wireless LAN terminal 6 currently accommodated makes a call or when an incoming call packet arrives from the PBX 1 (a2 in FIG. 6). Call state information is transmitted to the controller 2 without being transmitted to the LAN terminal 6 (a3 in FIG. 6).

コントローラ２は無線ＬＡＮ基地局（＃１）４−１から呼状態情報を受信した際、呼処理解析部２７において着信呼のパケットを分析し、帰属情報テーブル２４に呼状態と着信呼のパケットとを加える。   When the controller 2 receives the call state information from the wireless LAN base station (# 1) 4-1, the call processing analysis unit 27 analyzes the incoming call packet, and the attribute information table 24 stores the call state and the incoming call packet. Add

この時、コントローラ２は、ＡＰテーブル２５配下の無線ＬＡＮ端末毎の帰属情報テーブル２４の合計を再計算し（図６のａ４）、呼状態継続可否Ｂ（図５参照）を無線ＬＡＮ基地局（＃１）４−１へ通知する（図６のａ５）。通話数の合計が無線ＬＡＮ基地局（＃１）４−１の許容量を超えていた場合、コントローラ２は、呼状態継続可否Ｂに「１：不可」を設定して無線ＬＡＮ基地局（＃１）４−１へ送信する。   At this time, the controller 2 recalculates the total of the belonging information table 24 for each wireless LAN terminal under the AP table 25 (a4 in FIG. 6), and determines whether or not the call state continuation availability B (see FIG. 5) is a wireless LAN base station ( # 1) Notify 4-1 (a5 in FIG. 6). When the total number of calls exceeds the allowable amount of the wireless LAN base station (# 1) 4-1, the controller 2 sets “1: Impossible” to the call state continuation permission / inhibition B and sets the wireless LAN base station (# 1) Send to 4-1

無線ＬＡＮ基地局（＃１）４−１は呼状態継続可否Ｂ（０：可）を受信すると、パケットフィルタ部４１において、着信呼のパケットを通過させる。無線ＬＡＮ基地局（＃１）４−１は呼状態継続可否Ｂ（１：不可）を受信すると、パケットフィルタ部４１において、着信呼のパケットを破棄し（パケットＤｒｏｐ）（図６のａ６）、無線ＬＡＮ端末６上で着信が発生することを防ぎ、８０２．１１ Ｉ／Ｆ部４６において、無線ＬＡＮ端末６を切断することで（図６のａ７）、無線ＬＡＮ端末６の別の無線ＬＡＮ基地局への移動を促す。   When the wireless LAN base station (# 1) 4-1 receives the call state continuation propriety B (0: possible), the packet filter unit 41 passes the packet of the incoming call. When the wireless LAN base station (# 1) 4-1 receives the call state continuation propriety B (1: impossibility), the packet filter unit 41 discards the packet of the incoming call (packet Drop) (a6 in FIG. 6). By preventing the incoming call from occurring on the wireless LAN terminal 6 and disconnecting the wireless LAN terminal 6 in the 802.11 I / F unit 46 (a7 in FIG. 6), another wireless LAN base of the wireless LAN terminal 6 is obtained. Encourage movement to the station.

無線ＬＡＮ基地局（＃１）４−１において無線ＬＡＮ端末６宛の着信呼が破棄された場合（切断成功通知）（図６のａ８）、コントローラ２は、無線ＬＡＮ端末６が無線ＬＡＮ基地局（＃１）４−１とは別の無線ＬＡＮ基地局へ帰属するまで、着信呼に対してＰＢＸ１宛に代理応答する（図６のａ９）。ＰＢＸ１はこの代理応答を受けて、発信者に応答を返す（図６のａ１０）。   When the incoming call addressed to the wireless LAN terminal 6 is canceled in the wireless LAN base station (# 1) 4-1 (notification of disconnection success) (a 8 in FIG. 6), the controller 2 indicates that the wireless LAN terminal 6 is connected to the wireless LAN base station. (# 1) Until it belongs to a wireless LAN base station different from 4-1, it makes a proxy response to PBX1 for the incoming call (a9 in FIG. 6). The PBX 1 receives this proxy response and returns a response to the caller (a10 in FIG. 6).

着信呼に応答したコントローラ２は、トーキ送出部２２からトーキ（電話サービスにおける自動音声ガイダンス）を送出し（図６のａ１１）、無線ＬＡＮ端末６宛に発信した発信者に対し、無線ＬＡＮ端末６が現在応答できない状態である旨を伝える（ＲＴＰ：Ｒｅａｌ−ｔｉｍｅ Ｔｒａｎｓｐｏｒｔ Ｐｒｏｔｏｃｏｌ）（図６のａ１２）。   The controller 2 responding to the incoming call sends a talk (automatic voice guidance in the telephone service) from the talk sending unit 22 (a11 in FIG. 6), and sends the call to the wireless LAN terminal 6 to the wireless LAN terminal 6 (RTP: Real-time Transport Protocol) (a12 in FIG. 6).

この時、発信者に対して、着信呼をＩＶＲ（Ｉｎｔｅｒａｃｔｉｖｅ Ｖｏｉｃｅ Ｒｅｓｐｏｎｓｅ）へ転送することで、着信呼の宛先の無線ＬＡＮ端末６がいずれかの無線ＬＡＮ基地局へ帰属して応答可能となった際、発信者へコールバックすることを約束し、発信者へ発信者の電話番号を問い合わせるプロンプトを送出しても良い。   At this time, by forwarding the incoming call to the interactive voice response (IVR) to the caller, the wireless LAN terminal 6 that is the destination of the incoming call belongs to one of the wireless LAN base stations and can respond. At this time, it is also possible to promise to call back the caller and send a prompt to the caller to inquire about the phone number of the caller.

無線ＬＡＮ基地局（＃２）４−２［または無線ＬＡＮ基地局（＃３）４−３］は、無線ＬＡＮ端末６が帰属した際（図８のｂ１）、コントローラ２に無線ＬＡＮ端末６に対する着信呼のパケットがないかを問い合わせる（帰属通知）（図８のｂ２）。   The wireless LAN base station (# 2) 4-2 [or the wireless LAN base station (# 3) 4-3] is assigned to the controller 2 with respect to the wireless LAN terminal 6 when the wireless LAN terminal 6 belongs (b1 in FIG. 8). An inquiry is made as to whether there is an incoming call packet (notification of belonging) (b2 in FIG. 8).

コントローラ２は、無線ＬＡＮ端末６に対する着信呼のパケット有無の問い合わせを無線ＬＡＮ基地局（＃２）４−２［または無線ＬＡＮ基地局（＃３）４−３］から受信した際、帰属情報テーブル２４から無線ＬＡＮ端末６の無線ＬＡＮ端末に対する着信呼のパケットを検索し、着信呼のパケットを無線ＬＡＮ端末６宛に送信する（図８のｂ３）。   When the controller 2 receives from the wireless LAN base station (# 2) 4-2 [or wireless LAN base station (# 3) 4-3] an inquiry about the presence or absence of an incoming call packet to the wireless LAN terminal 6, the attribution information table 24 searches for a packet of an incoming call to the wireless LAN terminal of the wireless LAN terminal 6, and transmits the packet of the incoming call to the wireless LAN terminal 6 (b3 in FIG. 8).

無線ＬＡＮ基地局（＃２）４−２［または無線ＬＡＮ基地局（＃３）４−３］は、無線ＬＡＮ端末６が帰属した際、無線ＬＡＮ端末６がブロードキャスト宛に発行するＡＲＰパケットをＡＲＰ解析部４４にて解析し、ＡＲＰテーブル４５に保存する。   The wireless LAN base station (# 2) 4-2 [or the wireless LAN base station (# 3) 4-3] ARP packet issued by the wireless LAN terminal 6 to the broadcast when the wireless LAN terminal 6 belongs. The data is analyzed by the analysis unit 44 and stored in the ARP table 45.

無線ＬＡＮ端末６が無線ＬＡＮ基地局（＃２）４−２［または無線ＬＡＮ基地局（＃３）４−３］へ帰属した後にＡＲＰを発行しない場合、無線ＬＡＮ基地局（＃２）４−２［または無線ＬＡＮ基地局（＃３）４−３］はＡＲＰテーブル４５を更新するために、ブロードキャスト宛、または無線ＬＡＮ端末６のＭＡＣアドレス宛にＡＲＰ要求を発行しても良い。   When the wireless LAN terminal 6 does not issue an ARP after belonging to the wireless LAN base station (# 2) 4-2 [or wireless LAN base station (# 3) 4-3], the wireless LAN base station (# 2) 4- 2 [or wireless LAN base station (# 3) 4-3] may issue an ARP request to broadcast or to the MAC address of the wireless LAN terminal 6 in order to update the ARP table 45.

無線ＬＡＮ基地局（＃２）４−２は、ルータ（＃２）３−２で分割された無線ＬＡＮ基地局（＃３）４−３とは異なるサブネットに属するため、ＩＰアドレスが変更される可能性があり、無線ＬＡＮ基地局（＃２）４−２内のパケット変換部４３にて、無線ＬＡＮ端末６へ着信呼のパケットを送信する前に、着信呼のパケット内のペイロード内のアドレス情報を、ＡＲＰテーブル４５で解決された新しいアドレスに変換して送信する。   Since the wireless LAN base station (# 2) 4-2 belongs to a different subnet from the wireless LAN base station (# 3) 4-3 divided by the router (# 2) 3-2, the IP address is changed. Before the packet conversion unit 43 in the wireless LAN base station (# 2) 4-2 transmits the incoming call packet to the wireless LAN terminal 6, there is an address in the payload in the incoming call packet. The information is converted into a new address resolved in the ARP table 45 and transmitted.

無線ＬＡＮ基地局（＃１）４−１から切断された無線ＬＡＮ端末６が、無線ＬＡＮ基地局（＃２）４−２または無線ＬＡＮ基地局（＃３）４−３のいずれかに帰属し、着信呼のパケットを受信した後、その着信呼に対して無線ＬＡＮ端末６が鳴動成功した場合（図８のｂ８）、コントローラ２は発信者へ流したトーキの呼（図８のｂ１）を保留し、ＰＢＸ１を介して発信者を非保留状態とすることで、発信者に対して保留音を送出する（図８のｂ５〜ｂ７）。   The wireless LAN terminal 6 disconnected from the wireless LAN base station (# 1) 4-1 belongs to either the wireless LAN base station (# 2) 4-2 or the wireless LAN base station (# 3) 4-3. When the wireless LAN terminal 6 successfully rings for the incoming call after receiving the incoming call packet (b8 in FIG. 8), the controller 2 sends the talk call (b1 in FIG. 8) sent to the caller. By holding and placing the caller in a non-hold state via PBX 1, a hold sound is sent to the caller (b 5 to b 7 in FIG. 8).

保留が成功した場合、コントローラ２はＰＢＸ１に対して、無線ＬＡＮ端末６に転送中で、鳴動中である旨の発信者へのＲＢＴ（Ｒｉｎｇ Ｂａｃｋ Ｔｏｎｅ）を送出し、発信者の非保留状態を解除し、呼出状態転送とする（図８のｂ９〜ｂ１３）。   If the hold is successful, the controller 2 sends an RBT (Ring Back Tone) to the PBX 1 to the caller indicating that it is transferring to the wireless LAN terminal 6 and is ringing. It is canceled and the call state is transferred (b9 to b13 in FIG. 8).

上記のように、無線ＬＡＮ基地局（＃１）４−１が無線ＬＡＮ端末６を切断してから、コントローラ２が発信者に対して呼出状態を転送するまでの動作を図７に示す。   FIG. 7 shows the operation from when the wireless LAN base station (# 1) 4-1 disconnects the wireless LAN terminal 6 until the controller 2 transfers the calling state to the caller as described above.

無線ＬＡＮ基地局（＃１）４−１から切断された無線ＬＡＮ端末６が、エリア内の全ての無線ＬＡＮ基地局の何れにも帰属できなかった場合、コントローラ２は、最後に無線ＬＡＮ端末６が帰属していた無線ＬＡＮ基地局（＃１）４−１と、無線ＬＡＮ端末６のＭＡＣアドレスとをアラーム表示部２９に表示し、アラームをログ保存部２８に保存することで、管理者にイベントを通知する。   If the wireless LAN terminal 6 disconnected from the wireless LAN base station (# 1) 4-1 cannot be attributed to any of the wireless LAN base stations in the area, the controller 2 finally ends the wireless LAN terminal 6 Is displayed on the alarm display unit 29 and the alarm is stored in the log storage unit 28, so that the administrator can Notify the event.

その他、アラーム表示部２９はＳＮＭＰ（Ｓｉｍｐｌｅ Ｎｅｔｗｏｒｋ Ｍａｎａｇｅｍｅｎｔ Ｐｒｏｔｏｃｏｌ）で別ホストへ通知したり、管理者のメールアドレスに自動的にメールを送信してもよい。   In addition, the alarm display unit 29 may notify another host by SNMP (Simple Network Management Protocol), or may automatically send an email to the administrator's email address.

また、無線ＬＡＮ基地局（＃１）４−１から切断された無線ＬＡＮ端末６が、エリア内の全ての無線ＬＡＮ基地局の何れにも帰属できなかった場合、コントローラ２は、例えばＰＢＸ１の内線番号毎や、ＳＩＰ（Ｓｅｓｓｉｏｎ Ｉｎｉｔｉａｔｉｏｎ Ｐｒｏｔｏｃｏｌ）アドレス毎に無線ＬＡＮ基地局の利用者のメールアドレスを保持し、無線ＬＡＮ基地局の利用者のメールアドレスに自動的にメールを送信してもよい。   If the wireless LAN terminal 6 disconnected from the wireless LAN base station (# 1) 4-1 cannot be attributed to any of the wireless LAN base stations in the area, the controller 2 uses, for example, the extension of the PBX 1 The mail address of the user of the wireless LAN base station may be held for each number or for each SIP (Session Initiation Protocol) address, and the mail may be automatically transmitted to the mail address of the user of the wireless LAN base station.

このように、本実施の形態では、制限した着信呼に対して代理応答しているので、無線ＬＡＮ基地局が通話数を制限する目的で、着信呼が発生した無線ＬＡＮ端末を切断した場合でも、発信者が直ちに着信呼を切断することを防止することできる。   As described above, in this embodiment, since the proxy response is made to the limited incoming call, even if the wireless LAN base station disconnects the wireless LAN terminal where the incoming call has occurred for the purpose of limiting the number of calls. The caller can be prevented from immediately disconnecting the incoming call.

また、本実施の形態では、ＰＢＸ１が発信した呼の比較的短いタイムアウトを、コントローラ２が着信呼に対して代理応答しているので、延長することができる。   In the present embodiment, the relatively short timeout of the call originated by the PBX 1 can be extended because the controller 2 makes a proxy response to the incoming call.

さらに、本実施の形態では、コントローラ２と無線ＬＡＮ基地局（＃１）４−１とが無線ＬＡＮ端末６の代理を行うことで、無線ＬＡＮ基地局（＃１）４−１に複数のＰＢＸと無線ＬＡＮ端末との組み合わせについて、通話数制限を提供することができる。   Further, in the present embodiment, the controller 2 and the wireless LAN base station (# 1) 4-1 act as a proxy for the wireless LAN terminal 6, so that the wireless LAN base station (# 1) 4-1 has a plurality of PBXs. And the number of calls can be provided for the combination of wireless LAN terminals.

さらにまた、本実施の形態では、コントローラ２が管理者または利用者に、呼があふれた旨の通知を行っているので、管理者が無線ＬＡＮ基地局の収容能力不足を分析することができる。   Furthermore, in the present embodiment, the controller 2 notifies the administrator or user that the call has overflowed, so the administrator can analyze the lack of capacity of the wireless LAN base station.

図９は本発明の第２の実施の形態による無線ＬＡＮ通信システムの構成例を示すブロック図である。図９において、本発明の第２の実施の形態による無線ＬＡＮ通信システムは、その基本的構成が上記の本発明の第１の実施の形態による無線ＬＡＮ通信システムと同様であるが、ルータがないレイヤ２のみの構成についてさらに工夫している。   FIG. 9 is a block diagram showing a configuration example of a wireless LAN communication system according to the second embodiment of the present invention. In FIG. 9, the basic configuration of the wireless LAN communication system according to the second embodiment of the present invention is the same as that of the wireless LAN communication system according to the first embodiment of the present invention, but there is no router. Further devised the configuration of layer 2 only.

図９において、ルータを介さないレイヤ２のみの構成の場合、レイヤ３の再帰属は発生し得ず、無線ＬＡＮ基地局（＃１，＃２）４−１，４−２は各無線ＬＡＮ基地局で独立して通話数のカウントを行い、通話数があふれ、新たな着信呼を持つ無線ＬＡＮ端末６を切断した無線ＬＡＮ基地局（＃１）４−１は、上記のコントローラ２の機能（帰属情報テーブル２４の管理、代理応答、アラーム表示等の機能）を包括し、無線ＬＡＮ基地局（＃２）４−２が上記のコントローラ２の機能（着信呼のパケットの検索・送信、発信者に対する保留音送出、呼出状態の転送等の機能）を包括することで、コントローラ２を使用せずに構成してもよい。   In FIG. 9, in the case of the configuration of only layer 2 without using a router, reassignment of layer 3 cannot occur, and the wireless LAN base stations (# 1, # 2) 4-1 and 4-2 The wireless LAN base station (# 1) 4-1 that counts the number of calls independently at the station, disconnects the wireless LAN terminal 6 having a new incoming call because the number of calls overflows, The management of the attribution information table 24, proxy response, alarm display, etc.) is included, and the wireless LAN base station (# 2) 4-2 performs the functions of the controller 2 (search / transmission of incoming call packet, caller) In other words, the controller 2 may be configured without using the controller 2.

その場合、無線ＬＡＮ基地局（＃１，＃２）４−１，４−２から見ると、コントローラ２はルータ（＃１，＃２）３−１，３−２の先に設置されているため、コントローラ２のＩＰアドレスを無線ＬＡＮ基地局（＃１，＃２）４−１，４−２に設定し、無線ＬＡＮ基地局（＃１，＃２）４−１，４−２とコントローラ２との通信はユニキャストで行われる。   In that case, when viewed from the wireless LAN base stations (# 1, # 2) 4-1, 4-2, the controller 2 is installed at the end of the routers (# 1, # 2) 3-1, 3-2. Therefore, the IP address of the controller 2 is set to the wireless LAN base stations (# 1, # 2) 4-1, 4-2, and the wireless LAN base stations (# 1, # 2) 4-1, 4-2 and the controller Communication with 2 is performed by unicast.

しかしながら、上記の無線ＬＡＮ基地局（＃１）４−１からコントローラ２への着信呼の通知は、無線ＬＡＮ基地局内部で処理されるために必要なく、上記の着信呼を有する無線ＬＡＮ端末６を切断した無線ＬＡＮ基地局（＃１）４−１は、同一サブネット内のいずれかの無線ＬＡＮ基地局が切断した無線ＬＡＮ端末を収容することを期待し、ブロードキャスト宛に切断通知を行う。   However, the notification of the incoming call from the wireless LAN base station (# 1) 4-1 to the controller 2 is not necessary because it is processed inside the wireless LAN base station, and the wireless LAN terminal 6 having the incoming call is not necessary. The wireless LAN base station (# 1) 4-1 that has disconnected is expected to accommodate the wireless LAN terminal disconnected by any wireless LAN base station in the same subnet, and sends a disconnect notification to the broadcast.

切断通知を受信した無線ＬＡＮ基地局（＃２）４−２は、切断された着信呼を有する無線ＬＡＮ端末６が収容された場合、コントローラ２の代わりに無線ＬＡＮ基地局（＃１）４−１へ帰属の通知を行い、無線ＬＡＮ基地局（＃１）４−１は、着信呼を無線ＬＡＮ基地局（＃２）４−２宛に送信することで、上述したような着信呼のパケットの検索・送信の操作を行う。   When the wireless LAN base station (# 2) 4-2 that has received the disconnection notice accommodates the disconnected incoming call, the wireless LAN base station (# 1) 4-2 instead of the controller 2 is accommodated. 1, the wireless LAN base station (# 1) 4-1 transmits the incoming call to the wireless LAN base station (# 2) 4-2, thereby receiving the incoming call packet as described above. Perform search / send operations.

このように、本実施の形態では、無線ＬＡＮ基地局がコントローラの機能を代行しているので、コントローラレスのメッシュ型のネットワークを組めるという効果が得られる。本構成において、レイヤ２のみの構成に限り、コントローラは任意の無線ＬＡＮ基地局で構成してもよい。   As described above, in this embodiment, since the wireless LAN base station performs the function of the controller, an effect that a controller-less mesh network can be assembled is obtained. In this configuration, the controller may be configured by an arbitrary wireless LAN base station only in the configuration of layer 2 only.

すなわち、本発明は、無線ＬＡＮ基地局において、無線ＬＡＮ基地局へ収容される無線ＬＡＮ端末（ＶＯＩＰ）の通話数の制限を行うに当たり、無線ＬＡＮ端末が応答できるようになるまで、ＶＯＩＰ着信呼が制限された無線ＬＡＮ端末の代わりに、コントローラまたは無線ＬＡＮ基地局が代理応答を行うことで、呼損率を低下させ、応答性を高めることを特徴としている。   That is, according to the present invention, in the wireless LAN base station, when the number of calls of the wireless LAN terminal (VOIP) accommodated in the wireless LAN base station is limited, until the wireless LAN terminal can respond, Instead of a restricted wireless LAN terminal, the controller or wireless LAN base station makes a proxy response, thereby reducing the call loss rate and improving the response.

この場合、コントローラは、無線ＬＡＮ基地局毎に通話数をカウントする手段と、着信呼のパケットを無線ＬＡＮ基地局・無線ＬＡＮ端末毎に記録する手段と、無線ＬＡＮ基地局・無線ＬＡＮ端末毎に呼状態を記録する手段と、無線ＬＡＮ基地局に着信呼の宛先の無線ＬＡＮ端末を切断させる通知を行う手段と、無線ＬＡＮ端末が圏内に復帰するまで着信呼の宛先に代理応答してトーキを送出する手段と、無線ＬＡＮ端末が圏内に復帰後、着信呼を保留して自動的に無線ＬＡＮ端末へ転送することで、着信呼を再開させる手段と、無線ＬＡＮ基地局の通話数のあふれにより切断した無線ＬＡＮ端末があった場合、無線ＬＡＮ基地局の増設を促すアラームを表示する手段と、無線ＬＡＮ基地局の通話数のあふれによって切断した無線ＬＡＮ端末があった場合、無線ＬＡＮ基地局の増設を促すログを保存する手段とを有している。   In this case, the controller includes means for counting the number of calls for each wireless LAN base station, means for recording incoming call packets for each wireless LAN base station / wireless LAN terminal, and for each wireless LAN base station / wireless LAN terminal. Means for recording the call state, means for notifying the wireless LAN base station to disconnect the destination wireless LAN terminal of the incoming call, and proxying the incoming call destination to the proxy until the wireless LAN terminal returns to the service area. A means for sending out, a means for resuming an incoming call by holding the incoming call and automatically transferring it to the wireless LAN terminal after the wireless LAN terminal returns to the service area; If there is a disconnected wireless LAN terminal, means for displaying an alarm prompting the addition of the wireless LAN base station, and the wireless LAN terminal disconnected due to overflow of the number of calls of the wireless LAN base station When there, and means for storing the log to encourage expansion of the wireless LAN base station.

無線ＬＡＮ基地局は、無線ＬＡＮ端末へのパケットがＶＯＩＰ通話であることを判別する手段と、着信呼のパケットをコントローラへ送信する手段と、無線ＬＡＮ端末への着信呼が制限されたもので、無線ＬＡＮ端末のＩＰアドレスが切断前後で変更されたものがある場合に着信呼のパケットを変換する手段とを有している。   The wireless LAN base station includes a means for determining that the packet to the wireless LAN terminal is a VOIP call, a means for transmitting an incoming call packet to the controller, and an incoming call to the wireless LAN terminal are limited. And a means for converting an incoming call packet when the IP address of the wireless LAN terminal is changed before and after disconnection.

ＩＥＥＥ８０２．１１ インフラストラクチャ型の無線通信方式を行う無線ＬＡＮ基地局は、現在収容中の複数の無線ＬＡＮ端末がＶＯＩＰ通話を開始した場合、通話数をカウントする。無線ＬＡＮ基地局は、収容中のＶＯＩＰ通話のトラフィックが増大して閾値を超え、無線ＬＡＮ端末へＰＢＸから着信呼が発生した場合、既に通話を行っている無線ＬＡＮ端末群の通話品質を確保するために、新たな着信呼が発生した無線ＬＡＮ端末を切断する。   A wireless LAN base station that performs an IEEE802.11 infrastructure-type wireless communication method counts the number of calls when a plurality of currently accommodated wireless LAN terminals start a VOIP call. When the traffic of accommodated VOIP calls increases and exceeds the threshold value and an incoming call is generated from the PBX to the wireless LAN terminal, the wireless LAN base station ensures the call quality of the wireless LAN terminal group that has already made the call. Therefore, the wireless LAN terminal in which a new incoming call has occurred is disconnected.

無線ＬＡＮ基地局は、無線ＬＡＮ端末が他の無線ＬＡＮ基地局へ帰属した後、コントローラへ着信のＶＯＩＰ呼処理パケットを送信する。他の無線ＬＡＮ基地局は、無線ＬＡＮ端末が配下に帰属した際、コントローラから着信のＶＯＩＰ呼処理パケットを受信する。他の無線ＬＡＮ基地局は、配下に帰属した無線ＬＡＮ端末へ着信のＶＯＩＰ呼処理パケットを送信し、着信を再開させる。   After the wireless LAN terminal belongs to another wireless LAN base station, the wireless LAN base station transmits an incoming VOIP call processing packet to the controller. Other wireless LAN base stations receive an incoming VOIP call processing packet from the controller when the wireless LAN terminal belongs to the subordinate. The other wireless LAN base station transmits the incoming VOIP call processing packet to the wireless LAN terminal belonging to the subordinate and resumes the incoming call.

この時、コントローラは、予め設定された発信タイムアウトを過ぎても無線ＬＡＮ端末がどの無線ＬＡＮ基地局へも帰属できなかった場合、着信のＶＯＩＰ呼処理パケットに対して代理応答する。無線ＬＡＮ端末がいずれかの無線ＬＡＮ基地局へ帰属した場合、コントローラは無線ＬＡＮ基地局へ着信のＶＯＩＰ呼処理パケットを送信し、着信を再開させる。   At this time, if the wireless LAN terminal cannot belong to any wireless LAN base station even after a preset transmission timeout, the controller makes a proxy response to the incoming VOIP call processing packet. When the wireless LAN terminal belongs to any one of the wireless LAN base stations, the controller transmits an incoming VOIP call processing packet to the wireless LAN base station to resume the incoming call.

このように、本発明では、無線ＬＡＮ端末への着信呼へ代理応答することで、着信呼の確率の成功率を高めることができる。   Thus, in the present invention, the success rate of the probability of an incoming call can be increased by making a proxy response to the incoming call to the wireless LAN terminal.

本発明は、ＩＥＥＥ８０２．１１ 無線ＬＡＮ端末を収容するＶＯＩＰ ＰＢＸシステムに適用可能である。   The present invention is applicable to a VOIP PBX system that accommodates IEEE 802.11 wireless LAN terminals.

本発明の第１の実施の形態による無線ＬＡＮ通信システムの構成例を示すブロック図である。1 is a block diagram illustrating a configuration example of a wireless LAN communication system according to a first embodiment of the present invention. 図１のコントローラ及び無線ＬＡＮ基地局の構成例を示すブロック図である。FIG. 2 is a block diagram illustrating a configuration example of a controller and a wireless LAN base station in FIG. 1. 図２の帰属テーブルの構成例を示す図である。It is a figure which shows the structural example of the attribution table of FIG. 本発明の第１の実施の形態における呼状態情報を示す図である。It is a figure which shows the call state information in the 1st Embodiment of this invention. 本発明の第１の実施の形態における呼状態継続可否を示す図である。It is a figure which shows the call state continuation propriety in the 1st Embodiment of this invention. 図１のコントローラが無線ＬＡＮ基地局に対して無線ＬＡＮ端末を切断する旨を通知する際の動作を示すシーケンスチャートである。3 is a sequence chart showing an operation when the controller of FIG. 1 notifies the wireless LAN base station that the wireless LAN terminal is disconnected. 本発明の第１の実施の形態による無線ＬＡＮ通信システムの動作を示すタイムチャートである。It is a time chart which shows operation | movement of the wireless LAN communication system by the 1st Embodiment of this invention. 本発明の第１の実施の形態による無線ＬＡＮ通信システムにおける端末帰属時の動作を示すシーケンスチャートである。5 is a sequence chart showing an operation when a terminal belongs in the wireless LAN communication system according to the first exemplary embodiment of the present invention. 本発明の第２の実施の形態による無線ＬＡＮ通信システムの構成例を示すブロック図である。It is a block diagram which shows the structural example of the wireless LAN communication system by the 2nd Embodiment of this invention.

符号の説明Explanation of symbols

１ ＰＢＸ
２ コントローラ
３−１，３−２ ルータ（＃１，＃２）
４−１〜４−３ 無線ＬＡＮ基地局（＃１〜＃３）
５ 無線ＬＡＮ端末群
６ 無線ＬＡＮ端末
２１，４２ ＩＥＥＥ８０２．３ Ｅｔｈｅｒｎｅｔ（登録商標）インタフェース
２２ トーキ送出部
２３ 帰属情報管理部
２４ 帰属情報テーブル
２５ ＡＰテーブル
２６ パケット変換部
２７ 呼処理解析部
２８ ログ保存部
２９ アラーム表示部
４１ パケットフィルタ部
４３ パケット変換部
４４ ＡＲＰ解析部
４５ ＡＲＰテーブル
４６ ＩＥＥＥ８０２．１１インタフェース 1 PBX
2 Controller 3-1, 3-2 Router (# 1, # 2)
4-1 to 4-3 wireless LAN base stations (# 1 to # 3)
5 Wireless LAN terminals
6 Wireless LAN terminal 21, 42 IEEE802.3 Ethernet (registered trademark) interface
22 TOKI sending section
23 Attribution Information Management Department
24 Attribution information table
25 AP table
26 Packet converter
27 Call processing analysis unit
28 Log storage
29 Alarm display
41 Packet filter section
43 Packet converter
44 ARP analysis unit
45 ARP table
46 IEEE 802.11 interface

Claims (15)

無線ＬＡＮ（Ｌｏｃａｌ Ａｒｅａ Ｎｅｔｗｏｒｋ）基地局へ収容される無線ＬＡＮ端末の通話数の制限を行う無線ＬＡＮ通信システムであって、
前記通話数の制限の対象となる無線ＬＡＮ端末が応答できるようになるまで当該無線ＬＡＮ端末への着信呼に対して代理応答を行う手段を有することを特徴とする無線ＬＡＮ通信システム。 A wireless LAN communication system that limits the number of calls of wireless LAN terminals accommodated in a wireless LAN (Local Area Network) base station,
A wireless LAN communication system comprising means for performing a proxy response to an incoming call to a wireless LAN terminal until the wireless LAN terminal subject to restriction on the number of calls can respond. 前記代理応答を行う手段は、制限した着信呼の着信が再開する期間内に前記代理応答を行うことを特徴とする請求項１記載の無線ＬＡＮ通信システム。   The wireless LAN communication system according to claim 1, wherein the proxy response means performs the proxy response within a period in which the incoming of the limited incoming call is resumed. 前記無線ＬＡＮ基地局及び前記無線ＬＡＮ端末を管理するコントローラ装置に、前記代理応答を行う手段を配設したことを特徴とする請求項１または請求項２記載の無線ＬＡＮ通信システム。   3. The wireless LAN communication system according to claim 1, wherein means for performing the proxy response is provided in a controller device that manages the wireless LAN base station and the wireless LAN terminal. 前記コントローラ装置は、前記無線ＬＡＮ基地局毎に通話数をカウントする手段と、前記着信呼のパケットを前記無線ＬＡＮ基地局及び前記無線ＬＡＮ端末毎に記録する手段と、前記無線ＬＡＮ基地局及び前記無線ＬＡＮ端末毎に呼状態を記録する手段と、前記無線ＬＡＮ基地局に着信呼の宛先の無線ＬＡＮ端末を切断させる通知を行う手段と、前記無線ＬＡＮ端末が圏内に復帰するまで前記着信呼の宛先に代理応答してトーキを送出する手段と、前記無線ＬＡＮ端末が圏内に復帰した後に前記着信呼を保留して自動的に前記無線ＬＡＮ端末へ転送することで前記着信呼の処理を再開させる手段とを含み、
前記無線ＬＡＮ基地局は、前記着信呼のパケットを前記コントローラ装置へ送信する手段を含むことを特徴とする請求項３記載の無線ＬＡＮ通信システム。 The controller device includes means for counting the number of calls for each wireless LAN base station, means for recording a packet of the incoming call for each of the wireless LAN base station and the wireless LAN terminal, the wireless LAN base station, and the wireless LAN base station. Means for recording a call state for each wireless LAN terminal; means for notifying the wireless LAN base station to disconnect the wireless LAN terminal that is the destination of the incoming call; and receiving the incoming call until the wireless LAN terminal returns to the service area. A means for sending a token in response to a proxy to the destination, and resuming the processing of the incoming call by holding the incoming call after the wireless LAN terminal returns to the service area and automatically transferring it to the wireless LAN terminal Means,
4. The wireless LAN communication system according to claim 3, wherein said wireless LAN base station includes means for transmitting said incoming call packet to said controller device. 前記コントローラ装置は、前記無線ＬＡＮ基地局の通話数のあふれによって切断した無線ＬＡＮ端末があった場合に前記無線ＬＡＮ基地局の増設を促すアラームを表示する手段と、当該切断した無線ＬＡＮ端末があった場合に前記無線ＬＡＮ基地局の増設を促すログを保存する手段とを含むことを特徴とする請求項３または請求項４記載の無線ＬＡＮ通信システム。   The controller device includes means for displaying an alarm prompting the addition of the wireless LAN base station when there is a wireless LAN terminal disconnected due to an overflow of the number of calls of the wireless LAN base station, and the disconnected wireless LAN terminal. 5. The wireless LAN communication system according to claim 3, further comprising means for storing a log for encouraging the addition of the wireless LAN base station when the wireless LAN base station is added. 前記無線ＬＡＮ基地局は、前記無線ＬＡＮ端末への着信呼が制限されたもので前記無線ＬＡＮ端末のＩＰアドレスが切断前後で変更されたものがある場合に前記着信呼のパケットの内容を変換する手段を含むことを特徴とする請求項３から請求項５のいずれか記載の無線ＬＡＮ通信システム。   The wireless LAN base station converts the content of the packet of the incoming call when the incoming call to the wireless LAN terminal is restricted and the IP address of the wireless LAN terminal is changed before and after disconnection 6. The wireless LAN communication system according to claim 3, further comprising means. 前記コントローラ装置の各手段を前記無線ＬＡＮ基地局に配設したことを特徴とする請求項１から請求項６のいずれか記載の無線ＬＡＮ通信システム。   The wireless LAN communication system according to any one of claims 1 to 6, wherein each means of the controller device is arranged in the wireless LAN base station. 請求項１から請求項６のいずれか記載の手段を含むことを特徴とするコントローラ装置。   A controller apparatus comprising the means according to claim 1. 請求項１から請求項７のいずれか記載の手段を含むことを特徴とする無線ＬＡＮ基地局。   A wireless LAN base station comprising the means according to claim 1. 無線ＬＡＮ（Ｌｏｃａｌ Ａｒｅａ Ｎｅｔｗｏｒｋ）基地局へ収容される無線ＬＡＮ端末の通話数の制限を行う無線ＬＡＮ通信システムに用いる無線ＬＡＮ通信方法であって、
前記無線ＬＡＮ基地局及び前記無線ＬＡＮ端末を管理するコントローラ装置が、前記通話数の制限の対象となる無線ＬＡＮ端末が応答できるようになるまで当該無線ＬＡＮ端末への着信呼に対して代理応答を行う処理を実行することを特徴とする無線ＬＡＮ通信方法。 A wireless LAN communication method used in a wireless LAN communication system for limiting the number of calls of a wireless LAN terminal accommodated in a wireless LAN (Local Area Network) base station,
The controller device that manages the wireless LAN base station and the wireless LAN terminal sends a proxy response to an incoming call to the wireless LAN terminal until the wireless LAN terminal subject to the restriction on the number of calls can respond. The wireless LAN communication method characterized by performing the process to perform. 前記コントローラ装置が、前記代理応答を行う処理において、制限した着信呼の着信が再開する期間内に前記代理応答を行うことを特徴とする請求項１０記載の無線ＬＡＮ通信方法。   The wireless LAN communication method according to claim 10, wherein the controller device performs the proxy response within a period in which the incoming of the limited incoming call is resumed in the process of performing the proxy response. 前記コントローラ装置が、前記無線ＬＡＮ基地局毎に通話数をカウントする処理と、前記着信呼のパケットを前記無線ＬＡＮ基地局及び前記無線ＬＡＮ端末毎に記録する処理と、前記無線ＬＡＮ基地局及び前記無線ＬＡＮ端末毎に呼状態を記録する処理と、前記無線ＬＡＮ基地局に着信呼の宛先の無線ＬＡＮ端末を切断させる通知を行う処理と、前記無線ＬＡＮ端末が圏内に復帰するまで前記着信呼の宛先に代理応答してトーキを送出する処理と、前記無線ＬＡＮ端末が圏内に復帰した後に前記着信呼を保留して自動的に前記無線ＬＡＮ端末へ転送することで前記着信呼の処理を再開させる処理とを実行し、
前記無線ＬＡＮ基地局が、前記着信呼のパケットを前記コントローラ装置へ送信する処理を実行することを特徴とする請求項１０または請求項１１記載の無線ＬＡＮ通信方法。 The controller device counts the number of calls for each wireless LAN base station, records the incoming call packet for each wireless LAN base station and each wireless LAN terminal, the wireless LAN base station, and the wireless LAN base station A process of recording a call state for each wireless LAN terminal, a process of notifying the wireless LAN base station to disconnect the wireless LAN terminal that is the destination of the incoming call, and a process of recording the incoming call until the wireless LAN terminal returns to the service area. Processing to send a token in response to proxy to the destination, and resume the processing of the incoming call by holding the incoming call after the wireless LAN terminal returns to the service area and automatically transferring it to the wireless LAN terminal Process and execute
The wireless LAN communication method according to claim 10 or 11, wherein the wireless LAN base station executes a process of transmitting the packet of the incoming call to the controller device. 前記コントローラ装置が、前記無線ＬＡＮ基地局の通話数のあふれによって切断した無線ＬＡＮ端末があった場合に前記無線ＬＡＮ基地局の増設を促すアラームを表示する処理と、当該切断した無線ＬＡＮ端末があった場合に前記無線ＬＡＮ基地局の増設を促すログを保存する処理とを実行することを特徴とする請求項１０から請求項１２のいずれか記載の無線ＬＡＮ通信方法。   When the controller device has a wireless LAN terminal that is disconnected due to overflow of the number of calls of the wireless LAN base station, there is a process for displaying an alarm prompting the addition of the wireless LAN base station, and there is the disconnected wireless LAN terminal. 13. The wireless LAN communication method according to claim 10, further comprising: storing a log that prompts the user to add a wireless LAN base station when the wireless LAN base station is added. 前記無線ＬＡＮ基地局が、前記無線ＬＡＮ端末への着信呼が制限されたもので前記無線ＬＡＮ端末のＩＰアドレスが切断前後で変更されたものがある場合に前記着信呼のパケットの内容を変換する処理を実行することを特徴とする請求項１０から請求項１３のいずれか記載の無線ＬＡＮ通信方法。   The wireless LAN base station converts the content of the packet of the incoming call when the incoming call to the wireless LAN terminal is restricted and the IP address of the wireless LAN terminal is changed before and after disconnection The wireless LAN communication method according to claim 10, wherein the process is executed. 前記コントローラ装置が実行する各処理を前記無線ＬＡＮ基地局において実行することを特徴とする請求項１０から請求項１４のいずれか記載の無線ＬＡＮ通信方法。   The wireless LAN communication method according to claim 10, wherein each process executed by the controller device is executed in the wireless LAN base station.
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