この発明は、無線装置、それにおける無線通信方法およびその無線装置を備えた無線ネットワークに関し、特に、無線通信の混雑度を用いて無線通信を制御する無線装置、それにおける無線通信方法およびその無線装置を備えた無線ネットワークに関するものである。 The present invention relates to a wireless device, a wireless communication method therefor, and a wireless network including the wireless device, and more particularly, a wireless device that controls wireless communication using a wireless communication congestion degree, a wireless communication method therefor, and the wireless device therefor It is related with the wireless network provided with.
従来、端末からアクセスポイントまでのＲＴＴ（Ｒｏｕｎｄ Ｔｒｉｐ Ｔｉｍｅ）を測定し、その測定したＲＴＴをリンクの混雑度として用いて無線リンクを切換える無線通信方式が知られている。 2. Description of the Related Art Conventionally, a wireless communication method is known in which RTT (Round Trip Time) from a terminal to an access point is measured, and the measured RTT is used as a link congestion level to switch a wireless link.
また、受信信号強度ＲＳＳＩに基づいて無線リンクを切換える無線通信方式も知られている。そして、この無線通信方式においては、測定された受信信号強度ＲＳＳＩがしきい値よりも低いとき、他の無線リンクに切換えられる（非特許文献１）。
しかし、ＲＴＴは、数ｍｓから１ｓまで大きく揺らぐため、ＲＴＴを混雑度として用いて無線リンクを切換えると、無線リンクの切換が頻繁に発生し、ネットワークが安定しないという問題がある。 However, since the RTT fluctuates greatly from several ms to 1 s, there is a problem that when the radio link is switched using the RTT as the congestion degree, the radio link is frequently switched and the network is not stable.
また、受信信号強度を用いて無線リンクを切換える無線通信方式では、測定した受信信号強度がしきい値よりも大きくても、ネットワークが混雑している場合、通信特性が低下するという問題が発生する。 In addition, in the wireless communication system that switches the wireless link using the received signal strength, there is a problem that the communication characteristics are deteriorated when the network is congested even if the measured received signal strength is larger than the threshold value. .
そこで、この発明は、かかる問題を解決するためになされたものであり、その目的は、通信特性の低下および無線リンクの頻繁な切換を抑制して無線リンクを切換可能な無線装置を提供することである。 Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to provide a radio apparatus capable of switching radio links while suppressing deterioration of communication characteristics and frequent switching of radio links. It is.
また、この発明の別の目的は、通信特性の低下および無線リンクの頻繁な切換を抑制して無線リンクを切換可能な無線通信方法を提供することである。 Another object of the present invention is to provide a radio communication method capable of switching radio links while suppressing deterioration of communication characteristics and frequent switching of radio links.
さらに、この発明の別の目的は、通信特性の低下および無線リンクの頻繁な切換を抑制して無線リンクを切換可能な無線装置を備える無線ネットワークを提供することである。 Furthermore, another object of the present invention is to provide a radio network including a radio device capable of switching radio links while suppressing deterioration of communication characteristics and frequent switching of radio links.
この発明によれば、無線装置は、第１および第２の無線モジュールと、測定手段と、分配手段とを備える。第１の無線モジュールは、無線通信空間のキャリアセンスを行ない、無線通信空間が空いているときに無線通信を行なう第１の無線通信システムを用いて第１の基地局との間で無線通信を行なう。第２の無線モジュールは、第１の無線通信システムと異なる第２の無線通信システムを用いて第１の基地局と異なる第２の基地局との間で無線通信を行なう。測定手段は、第１の無線モジュールが第１の基地局との間で無線通信を行なうときの第１の基地局の通信範囲における通信状況を反映した混雑度を測定する。分配手段は、測定手段によって測定された混雑度が第１のしきい値よりも大きくなると、第１の無線モジュールへのパケットの分配を停止し、パケットを第２の無線モジュールに分配する。 According to the present invention, the wireless device includes first and second wireless modules, a measuring unit, and a distributing unit. The first wireless module performs carrier sense of the wireless communication space, and performs wireless communication with the first base station using the first wireless communication system that performs wireless communication when the wireless communication space is available. Do. The second wireless module performs wireless communication between the first base station and a second base station using a second wireless communication system different from the first wireless communication system. The measuring means measures the degree of congestion reflecting the communication status in the communication range of the first base station when the first wireless module performs wireless communication with the first base station. The distribution unit stops distributing the packet to the first wireless module and distributes the packet to the second wireless module when the degree of congestion measured by the measuring unit becomes larger than the first threshold value.
好ましくは、測定手段は、第１の無線モジュール用に設けられたキューからパケットを取り出した第１の時刻と、第１の基地局から確認応答を受信した第２の時刻との間の時間を混雑度として測定する。 Preferably, the measuring means calculates a time between a first time when the packet is taken out from the queue provided for the first wireless module and a second time when the confirmation response is received from the first base station. Measure as congestion.
好ましくは、分配手段は、測定手段によって測定された混雑度が第１のしきい値よりも小さい第２のしきい値よりも小さくなると、第２の無線モジュールへのパケットの分配を停止し、パケットを第１の無線モジュールに分配する。 Preferably, the distribution unit stops distributing the packet to the second wireless module when the degree of congestion measured by the measurement unit is smaller than the second threshold value which is smaller than the first threshold value. Distribute the packet to the first wireless module.
また、この発明によれば、無線通信方法は、測定手段が、第１の無線モジュールが第１の無線通信システムを用いて第１の基地局との間で無線通信を行なうときの混雑度を測定する第１のステップと、測定された混雑度が第１のしきい値よりも大きいか否かを判定する第２のステップと、測定された混雑度が第１のしきい値よりも大きいと判定されたとき、第１の無線モジュールへのパケットの分配を停止し、第１の無線モジュールと異なる第２の無線モジュールへパケットを分配する第３のステップと、第２の無線モジュールが第１の無線通信システムと異なる第２の無線通信システムを用いて第１の基地局と異なる第２の基地局との間で無線通信を行なう第４のステップとを備える。 According to the invention, the wireless communication method is characterized in that the measuring means determines the degree of congestion when the first wireless module performs wireless communication with the first base station using the first wireless communication system. A first step of measuring, a second step of determining whether the measured congestion degree is greater than a first threshold value, and the measured congestion degree being greater than the first threshold value A third step of stopping the distribution of the packet to the first wireless module and distributing the packet to the second wireless module different from the first wireless module, and the second wireless module And a fourth step of performing wireless communication between the first base station and a second base station different from the first wireless communication system using a second wireless communication system different from the first wireless communication system.
好ましくは、第１のステップにおいて、測定手段は、第１の無線モジュール用に設けられたキューからパケットを取り出した第１の時刻と、第１の基地局から確認応答を受信した第２の時刻との間の時間を混雑度として測定する。 Preferably, in the first step, the measuring means has a first time when the packet is taken out from the queue provided for the first wireless module, and a second time when the confirmation response is received from the first base station. The time between is measured as the degree of congestion.
好ましくは、無線通信方法は、第４のステップが実行されているときに、測定された混雑度が第１のしきい値よりも小さい第２のしきい値よりも小さくなると、第２の無線モジュールへのパケットの分配を停止し、第１の無線モジュールへパケットを分配する第５のステップと、第１の無線モジュールが第１の無線通信システムを用いて第１の基地局との間で無線通信を行なう第６のステップとを更に備える。 Preferably, in the wireless communication method, when the fourth step is executed, if the measured degree of congestion is smaller than a second threshold value that is smaller than the first threshold value, the second wireless communication method is performed. A fifth step of stopping the distribution of the packet to the module and distributing the packet to the first wireless module; and the first wireless module using the first wireless communication system and the first base station. A sixth step of performing wireless communication.
更に、この発明によれば、無線ネットワークは、第１および第２の基地局と、複数の無線装置とを備える。第２の基地局は、第１の基地局と異なる。複数の無線装置の各々は、第１および第２の無線モジュールと、測定手段と、分配手段とを含む。第１の無線モジュールは、無線通信空間のキャリアセンスを行ない、無線通信空間が空いているときに無線通信を行なう第１の無線通信システムを用いて第１の基地局との間で無線通信を行なう。第２の無線モジュールは、第１の無線通信システムと異なる第２の無線通信システムを用いて第２の基地局との間で無線通信を行なう。測定手段は、第１の無線モジュールが第１の基地局との間で無線通信を行なうときの混雑度を測定する。分配手段は、測定手段によって測定された混雑度が第１のしきい値よりも大きくなると、第１の無線モジュールへのパケットの分配を停止し、パケットを第２の無線モジュールに分配する。 Furthermore, according to the present invention, the wireless network includes first and second base stations and a plurality of wireless devices. The second base station is different from the first base station. Each of the plurality of wireless devices includes first and second wireless modules, measurement means, and distribution means. The first wireless module performs carrier sense of the wireless communication space, and performs wireless communication with the first base station using the first wireless communication system that performs wireless communication when the wireless communication space is available. Do. The second wireless module performs wireless communication with the second base station using a second wireless communication system different from the first wireless communication system. The measuring means measures the degree of congestion when the first wireless module performs wireless communication with the first base station. The distribution unit stops distributing the packet to the first wireless module and distributes the packet to the second wireless module when the degree of congestion measured by the measuring unit becomes larger than the first threshold value.
好ましくは、測定手段は、第１の無線モジュール用に設けられたキューからパケットを取り出した第１の時刻と、第１の基地局から確認応答を受信した第２の時刻との間の時間を混雑度として測定する。 Preferably, the measuring means calculates a time between a first time when the packet is taken out from the queue provided for the first wireless module and a second time when the confirmation response is received from the first base station. Measure as congestion.
好ましくは、分配手段は、測定手段によって測定された混雑度が第１のしきい値よりも小さい第２のしきい値よりも小さくなると、第２の無線モジュールへのパケットの分配を停止し、パケットを第１の無線モジュールに分配する。 Preferably, the distribution unit stops distributing the packet to the second wireless module when the degree of congestion measured by the measurement unit is smaller than the second threshold value which is smaller than the first threshold value. Distribute the packet to the first wireless module.
この発明においては、第１の基地局の通信範囲における無線通信の通信状況を反映した混雑度を実測し、その実測した混雑度が第１のしきい値を超えると、第１の基地局との無線リンクを第２の基地局との無線リンクに切換えて無線通信が行なわれる。その結果、スループットの低下が抑制される。そして、この実測された混雑度は、揺らぎが小さいものである。 In this invention, the congestion level reflecting the communication status of the wireless communication in the communication range of the first base station is measured, and when the measured congestion level exceeds the first threshold, The wireless link is switched to the wireless link with the second base station to perform wireless communication. As a result, a decrease in throughput is suppressed. The actually measured congestion level has a small fluctuation.
従って、この発明によれば、通信特性の低下および無線リンクの頻繁な切換を抑制して無線リンクを切換えることができる。 Therefore, according to the present invention, it is possible to switch radio links while suppressing deterioration of communication characteristics and frequent switching of radio links.
本発明の実施の形態について図面を参照しながら詳細に説明する。なお、図中同一または相当部分には同一符号を付してその説明は繰返さない。 Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.
図１は、この発明の実施の形態による無線ネットワークの概略図である。無線ネットワーク１００は、無線装置１０，２０，３０，４０と、アクセスポイント５０と、基地局６０とを備える。 FIG. 1 is a schematic diagram of a wireless network according to an embodiment of the present invention. The wireless network 100 includes wireless devices 10, 20, 30, 40, an access point 50, and a base station 60.
無線装置１０，２０，３０，４０は、アクセスポイント５０の通信範囲と基地局６０の通信範囲との両方の重複範囲内に配置される。そして、無線装置１０，２０，３０，４０の各々は、アクセスポイント５０へアクセスすることも可能であり、基地局６０へアクセスすることも可能である。 The wireless devices 10, 20, 30, and 40 are arranged in the overlapping range of both the communication range of the access point 50 and the communication range of the base station 60. Each of the wireless devices 10, 20, 30, and 40 can access the access point 50 and can also access the base station 60.
無線装置１０，２０，３０，４０の各々は、後述する方法によって、アクセスポイント５０との間で無線通信を行なうときの混雑度Ｃｉｎｄを測定し、その測定した混雑度Ｃｉｎｄがしきい値Ｔｆよりも大きいとき、無線リンクをアクセスポイント５０へアクセスする無線リンクＭＬ１から基地局６０へアクセスする無線リンクＭＬ２へ切換え、パケットを基地局６０へ送信する。Each of the wireless devices 10, 20, 30, and 40 measures the degree of congestion Cind when performing wireless communication with the access point 50 by a method described later, and the measured degree of congestion Cind is a threshold value. When larger than Tf, the radio link ML1 that accesses the access point 50 is switched to the radio link ML2 that accesses the base station 60, and the packet is transmitted to the base station 60.
また、無線装置１０，２０，３０，４０の各々は、無線リンクを無線リンクＭＬ１から無線リンクＭＬ２へ切換えた後、アクセスポイント５０との間で無線通信を行なうときの混雑度Ｃｉｎｄを測定し、その測定した混雑度Ｃｉｎｄがしきい値Ｔｒ（＜Ｔｆ）よりも小さいとき、無線リンクを無線リンクＭＬ２から無線リンクＭＬ１へ切換え、パケットをアクセスポイント５０へ送信する。Each of the wireless devices 10, 20, 30, and 40 measures the congestion degree Cind when wireless communication is performed with the access point 50 after switching the wireless link from the wireless link ML1 to the wireless link ML2. When the measured congestion degree Cind is smaller than the threshold value Tr (<Tf ), the radio link is switched from the radio link ML2 to the radio link ML1, and the packet is transmitted to the access point 50.
更に、無線装置１０，２０，３０，４０の各々は、混雑度ＣｉｎｄがＴｒ＜Ｃｉｎｄ＜Ｔｆを満たすとき、現在の無線リンク（無線リンクＭＬ１または無線リンクＭＬ２）を維持する。Further, each of the wireless devices 10, 20, 30, and 40 maintains the current wireless link (the wireless link ML1 or the wireless link ML2) when the congestion degree Cind satisfies Tr <Cind <Tf .
アクセスポイント５０は、例えば、ＷｉＦｉのアクセスポイントからなり、無線装置１０，２，３０，４０との間で無線通信を行なう。 The access point 50 is, for example, a WiFi access point, and performs wireless communication with the wireless devices 10, 2, 30, and 40.
基地局６０は、例えば、ＷｉＭＡＸの基地局からなり、無線装置１０，２，３０，４０との間で無線通信を行なう。 The base station 60 includes, for example, a WiMAX base station, and performs wireless communication with the wireless devices 10, 2, 30, and 40.
なお、アクセスポイント５０および基地局６０は、バックボーンネットワーク（図示せず）に接続されている。 The access point 50 and the base station 60 are connected to a backbone network (not shown).
図２は、図１に示す無線装置１０の構成を示す概略図である。無線装置１０は、キュー１と、分配手段２と、無線モジュール３，４とを含む。そして、無線モジュール３は、キュー５を含み、無線モジュール４は、キュー６および測定手段７を含む。 FIG. 2 is a schematic diagram showing the configuration of the wireless device 10 shown in FIG. The wireless device 10 includes a queue 1, a distribution unit 2, and wireless modules 3 and 4. The wireless module 3 includes a queue 5, and the wireless module 4 includes a queue 6 and measurement means 7.
キュー１は、ＩＰ層からパケットＰＫＴを受け、その受けたパケットＰＫＴを一定時間保持した後、パケットＰＫＴを分配手段２へ出力する。 The queue 1 receives the packet PKT from the IP layer, holds the received packet PKT for a predetermined time, and then outputs the packet PKT to the distribution unit 2.
分配手段２は、キュー１からパケットＰＫＴを受け、測定手段７から混雑度Ｃｉｎｄを受ける。そして、分配手段２は、混雑度Ｃｉｎｄをしきい値Ｔｆと比較し、混雑度Ｃｉｎｄがしきい値Ｔｆよりも大きいとき、パケットＰＫＴのキュー６への分配を停止し、パケットＰＫＴをキュー５へ分配する。The distribution unit 2 receives the packet PKT from the queue 1 and the congestion degree Cind from the measurement unit 7. Then, the distribution unit 2 compares the congestion degree Cind with the threshold value Tf, and when the congestion degree Cind is larger than the threshold value Tf , stops the distribution of the packet PKT to the queue 6 and the packet PKT. Is distributed to queue 5.
また、分配手段２は、パケットＰＫＴをキュー５へ分配した後に、混雑度Ｃｉｎｄがしきい値Ｔｒよりも小さくなると、パケットＰＫＴのキュー５への分配を停止し、パケットＰＫＴをキュー６へ分配する。Further, after distributing the packet PKT to the queue 5, the distribution unit 2 stops distributing the packet PKT to the queue 5 when the congestion degree Cind becomes smaller than the threshold valueTr , and transfers the packet PKT to the queue 6. Distribute.
さらに、分配手段２は、混雑度ＣｉｎｄがＴｒ＜Ｃｉｎｄ＜Ｔｆを満たすとき、キュー５（またはキュー６）へのパケットＰＫＴの分配を維持する。Furthermore, the distribution unit 2 maintains the distribution of the packet PKT to the queue 5 (or the queue 6) when the congestion degree Cind satisfies Tr <Cind <Tf .
無線モジュール３は、ＩＥＥＥ８０２．１６によって基地局６０へアクセスする無線モジュールである。即ち、無線モジュール３は、ＷｉＭＡＸによって無線通信を行なう無線モジュールである。そして、無線モジュール３は、キュー５に分配されたパケットＰＫＴを基地局６０へ送信するとともに、基地局６０からのパケットＰＫＴを受信してＩＰ層以上の上位層へ出力する。 The wireless module 3 is a wireless module that accesses the base station 60 by IEEE 802.16. That is, the wireless module 3 is a wireless module that performs wireless communication by WiMAX. The wireless module 3 transmits the packet PKT distributed to the queue 5 to the base station 60, receives the packet PKT from the base station 60, and outputs the packet PKT to the upper layer above the IP layer.
無線モジュール４は、ＩＥＥＥ８０２．１１によってアクセスポイント５０へアクセスする無線モジュールである。即ち、無線モジュール４は、ＷｉＦｉによって無線通信を行なう無線モジュールである。そして、無線モジュール４は、キュー６に分配されたパケットＰＫＴをアクセスポイント５０へ送信するとともに、アクセスポイント５０からのパケットＰＫＴを受信してＩＰ層以上の上位層へ出力する
キュー５は、分配手段２から受けたパケットＰＫＴを保持するともに、その保持したパケットＰＫＴを無線モジュール３へ出力する。The wireless module 4 is a wireless module that accesses the access point 50 by IEEE 802.11. That is, the wireless module 4 is a wireless module that performs wireless communication by WiFi. The wireless module 4 transmits the packet PKT distributed to the queue 6 to the access point 50, receives the packet PKT from the access point 50, and outputs the packet PKT to an upper layer above the IP layer. 2 holds the packet PKT received from 2 and outputs the held packet PKT to the wireless module 3.
キュー６は、分配手段２から受けたパケットＰＫＴを保持するともに、その保持したパケットＰＫＴを無線モジュール４へ出力する。 The queue 6 holds the packet PKT received from the distribution unit 2 and outputs the held packet PKT to the wireless module 4.
測定手段７は、後述する方法によって、無線モジュール４がアクセスポイント５０との間で無線通信を行なうときの混雑度Ｃｉｎｄを測定し、その測定した混雑度Ｃｉｎｄを分配手段２へ出力する。The measuring means 7 measures the degree of congestion Cind when the wireless module 4 performs wireless communication with the access point 50 by the method described later, and outputs the measured degree of congestion Cind to the distributing means 2.
なお、図１に示す無線装置２０，３０，４０の各々は、図２に示す無線装置１０と同じ構成からなる。 Note that each of the wireless devices 20, 30, and 40 shown in FIG. 1 has the same configuration as the wireless device 10 shown in FIG.
図３は、混雑度の測定方法を説明するための概念図である。無線装置１０の無線モジュール４は、タイミングｔ１でキュー６からパケットＰＫＴを取り出すと、ＤＩＦＳ（Ｄｉｓｔｒｉｂｕｔｅｄ ａｃｃｅｓｓ Ｉｎｔｅｒ Ｆｒａｍｅ Ｓｐａｃｅ）を設定し、ＤＩＦＳが経過すると、バックオフタイム（ＢＯ：Ｂａｃｋ Ｏｆｆ））を設定する。そして、無線装置１０の無線モジュール４は、バックオフタイムが経過するタイミングｔ２でパケットＰＫＴの送信を試みる。 FIG. 3 is a conceptual diagram for explaining a method for measuring the degree of congestion. When the wireless module 4 of the wireless device 10 takes out the packet PKT from the queue 6 at the timing t1, it sets a DIFS (Distributed access Inter Frame Space), and sets a back-off time (BO: Back Off) when the DIFS has elapsed. To do. Then, the wireless module 4 of the wireless device 10 tries to transmit the packet PKT at the timing t2 when the back-off time elapses.
しかし、無線装置２０の無線モジュール４がタイミングｔ２よりも前のタイミングｔ３でパケットＰＫＴの送信を開始しているので、無線装置１０の無線モジュール４は、無線装置２０の無線モジュール４がアクセスポイント５０から確認応答（ＡＣＫ）を受信し終わるタイミングｔ４まで待機する。 However, since the wireless module 4 of the wireless device 20 starts transmission of the packet PKT at the timing t3 before the timing t2, the wireless module 4 of the wireless device 10 is connected to the access point 50 by the wireless module 4 of the wireless device 20. To the timing t4 when the acknowledgment response (ACK) is received.
その後、無線装置１０の無線モジュール４は、再度、ＤＩＦＳを設定し、ＤＩＦＳが経過すると、バックオフタイムを設定し、バックオフタイムが経過するタイミングｔ５でパケットＰＫＴの送信を開始する。 Thereafter, the wireless module 4 of the wireless device 10 sets DIFS again, sets the back-off time when the DIFS has elapsed, and starts transmitting the packet PKT at timing t5 when the back-off time elapses.
そして、無線装置１０の無線モジュール４は、パケットＰＫＴの送信が完了し、更に、ＳＩＦＳ（Ｓｈｏｒｔ Ｉｎｔｅｒ Ｆｒａｍｅ Ｓｐａｃｅ）が経過すると、アクセスポイント５０から確認応答（ＡＣＫ）を受信し始め、タイミングｔ６で確認応答（ＡＣＫ）の受信を完了する。 Then, when the transmission of the packet PKT is completed and SIFS (Short Inter Frame Space) elapses, the wireless module 4 of the wireless device 10 starts to receive an acknowledgment (ACK) from the access point 50, and confirms at timing t6. The reception of the response (ACK) is completed.
これによって、無線装置１０の無線モジュール４は、パケットＰＫＴのアクセスポイント５０への送信が成功したことを検知する。 As a result, the wireless module 4 of the wireless device 10 detects that the transmission of the packet PKT to the access point 50 is successful.
この発明においては、図３に示すタイミングｔ１からタイミングｔ６までの時間Ｔを無線モジュール４がアクセスポイント５０との間で無線通信を行なうときの混雑度Ｃｉｎｄと定義する。In the present invention, a time T from timing t1 to timing t6 shown in FIG. 3 is defined as a congestion degreeCind when the wireless module 4 performs wireless communication with the access point 50.
この混雑度Ｃｉｎｄは、無線装置１０の無線モジュール４と、アクセスポイント５０との間の無線リンクＭＬ１１０−５０の混み具合を表す。そして、混雑度Ｃｉｎｄが大きければ、無線リンクＭＬ１１０−５０を用いた無線装置１０−アクセスポイント５０間のスループットが低下し、混雑度Ｃｉｎｄが小さければ、無線リンクＭＬ１１０−５０を用いた無線装置１０−アクセスポイント５０間のスループットが向上する。従って、この混雑度Ｃｉｎｄは、無線リンクＭＬ１１０−５０のリンクコストを表す。This congestion degree Cind represents the degree of congestion of the wireless link ML110-50 between the wireless module 4 of the wireless device 10 and the access point 50. If the degree of congestion Cind is large, the throughput between the wireless device 10 and the access point 50 using the wireless link ML110-50 decreases. If the degree of congestion Cind is small, the wireless link ML110-50 is used. Throughput between the wireless device 10 and the access point 50 is improved. Accordingly, the congestion degree Cind represents the link cost of the radio link ML110-50 .
また、混雑度Ｃｉｎｄは、無線モジュール４がアクセスポイント５０へのパケットＰＫＴの送信を開始した時刻から、確認応答（ＡＣＫ）をアクセスポイント５０から実際に受信するまでの時刻であるので、混雑度Ｃｉｎｄは、ＩＥＥＥ８０２．１１によるネットワークの通信状況を反映した値になる。つまり、混雑度Ｃｉｎｄは、アクセスポイント５０の通信範囲における無線通信の通信状況を反映した値になる。Further, the congestion degree Cind is the time from when the wireless module 4 starts transmitting the packet PKT to the access point 50 to when the acknowledgment (ACK) is actually received from the access point 50. Cind is a value reflecting the communication status of the network according to IEEE 802.11. That is, the congestion degree Cind is a value reflecting the communication status of wireless communication in the communication range of the access point 50.
例えば、無線装置１０，２０，３０，４０のうち、無線装置１０のみがアクセスポイント５０へパケットＰＫＴを送信している場合、アクセスポイント５０は、無線装置１０からパケットＰＫＴを受信すると、直ちに、確認応答（ＡＣＫ）を無線装置１０へ送信する。 For example, when only the wireless device 10 among the wireless devices 10, 20, 30, and 40 transmits the packet PKT to the access point 50, the access point 50 immediately confirms when receiving the packet PKT from the wireless device 10. A response (ACK) is transmitted to the wireless device 10.
一方、無線装置１０，２０，３０，４０のうち、無線装置１０，２０がアクセスポイント５０へパケットＰＫＴを送信しており、無線装置２０の送信タイミングが無線装置１０の送信タイミングよりも早い場合、アクセスポイント５０は、無線装置１０からのパケットＰＫＴを受信し、かつ、確認応答（ＡＣＫ）を無線装置２０へ送信した後に、確認応答（ＡＣＫ）を無線装置１０へ送信する。即ち、アクセスポイント５０は、アクセスポイント５０における混み具合を反映したタイミングで確認応答（ＡＣＫ）を送信する。 On the other hand, if the wireless devices 10, 20, 30, 40 transmit the packet PKT to the access point 50 and the transmission timing of the wireless device 20 is earlier than the transmission timing of the wireless device 10, The access point 50 receives the packet PKT from the wireless device 10 and transmits an acknowledgment (ACK) to the wireless device 20, and then transmits an acknowledgment (ACK) to the wireless device 10. That is, the access point 50 transmits an acknowledgment (ACK) at a timing that reflects the degree of congestion at the access point 50.
従って、混雑度Ｃｉｎｄは、ＩＥＥＥ８０２．１１によるネットワークの混み具合を反映した値になる。Therefore, the degree of congestion Cind is a value reflecting the degree of network congestion according to IEEE 802.11.
無線装置１０の測定手段７は、タイマー（図示せず）を内蔵しており、無線モジュール４がパケットＰＫＴをキュー６から取り出した時刻ｔ１から、無線モジュール４が確認応答（ＡＣＫ）をアクセスポイント５０から受信した時刻ｔ６までの時間Ｔをタイマーを用いて測定し、その測定した時間Ｔを混雑度Ｃｉｎｄとして分配手段２へ出力する。The measuring means 7 of the wireless device 10 includes a timer (not shown), and the wireless module 4 sends an acknowledgment (ACK) to the access point 50 from time t1 when the wireless module 4 takes out the packet PKT from the queue 6. Is measured using a timer, and the measured time T is output to the distribution means 2 as the congestion degree Cind .
図４は、図１に示す無線ネットワーク１００における無線通信方法を説明するためのフローチャートである。なお、図４においては、無線装置１０が無線通信を行なう場合を例にして無線通信方法について説明する。 FIG. 4 is a flowchart for explaining a wireless communication method in wireless network 100 shown in FIG. In FIG. 4, the wireless communication method will be described by taking as an example the case where the wireless device 10 performs wireless communication.
一連の動作が開始されると、無線装置１０の無線モジュール４は、キュー６からパケットＰＫＴを取り出し、他の無線装置２０，３０，４０がアクセスポイント５０へパケットＰＫＴを送信していないことを確認すると、その取り出したパケットＰＫＴをアクセスポイント５０へ送信する。そして、無線装置１０の無線モジュール４は、アクセスポイント５０から確認応答（ＡＣＫ）を受信する。 When a series of operations is started, the wireless module 4 of the wireless device 10 extracts the packet PKT from the queue 6 and confirms that the other wireless devices 20, 30, and 40 are not transmitting the packet PKT to the access point 50. Then, the extracted packet PKT is transmitted to the access point 50. Then, the wireless module 4 of the wireless device 10 receives an acknowledgment (ACK) from the access point 50.
一方、無線装置１０の測定手段７は、無線モジュール４がパケットＰＫＴをキュー６から取り出した時刻から、確認応答（ＡＣＫ）をアクセスポイント５０から受信する時刻までの時間Ｔ-（＝混雑度Ｃｉｎｄ１）を内蔵したタイマーによって測定する。即ち、無線装置１０の測定手段７は、無線モジュール４（＝第１の無線モジュール）がアクセスポイント５０（＝第１の基地局）との間で無線通信を行なうときの混雑度Ｃｉｎｄ１を測定する（ステップＳ１）。On the other hand, the measuring means 7 of the wireless device 10 has a time T − (= congestion degree Cind ) from the time when the wireless module 4 extracts the packet PKT from the queue 6 to the time when the acknowledgment response (ACK) is received from the access point 50. 1) Measure with the built-in timer. That is, the measurement unit 7 of the wireless device 10 calculates the congestion degree Cind 1 when the wireless module 4 (= first wireless module) performs wireless communication with the access point 50 (= first base station). Measure (Step S1).
そして、無線装置１０の測定手段７は、その測定した混雑度Ｃｉｎｄ１を分配手段２へ出力する。無線装置１０の分配手段２は、測定手段７から混雑度Ｃｉｎｄ１を受け、その受けた混雑度Ｃｉｎｄ１がしきい値Ｔｆよりも大きいか否かを判定する（ステップＳ２）。Then, the measurement unit 7 of the wireless device 10 outputs the measured congestion degree Cind 1 to the distribution unit 2. The distribution unit 2 of the wireless device 10 receives the congestion degree Cind 1 from the measurement unit 7 and determines whether or not the received congestion degree Cind 1 is larger than the threshold value Tf (step S2).
ステップＳ２において、混雑度Ｃｉｎｄ１がしきい値Ｔｆ以下であると判定されたとき、無線装置１０の分配手段２は、無線モジュール４（＝第１の無線モジュール）へのパケットＰＫＴの分配を維持する（ステップＳ３）。その後、一連の動作は、ステップＳ１へ戻る。When it is determined in step S2 that the congestion degree Cind 1 is equal to or less than the threshold value Tf , the distribution unit 2 of the wireless device 10 distributes the packet PKT to the wireless module 4 (= first wireless module). Is maintained (step S3). Thereafter, the series of operations returns to step S1.
一方、ステップＳ２において、混雑度Ｃｉｎｄ１がしきい値Ｔｆよりも大きいと判定されたとき、無線装置１０の分配手段２は、無線モジュール４（＝第１の無線モジュール）へのパケットＰＫＴの分配を停止し、無線モジュール３（＝第２の無線モジュール）へパケットＰＫＴを分配する（ステップＳ４）。On the other hand, when it is determined in step S2 that the congestion degree Cind 1 is larger than the threshold value Tf , the distribution unit 2 of the wireless device 10 determines that the packet PKT to the wireless module 4 (= first wireless module). Distribution is stopped, and the packet PKT is distributed to the wireless module 3 (= second wireless module) (step S4).
そして、無線装置１０の無線モジュール３は、キュー５からパケットＰＫＴを取り出し、その取り出したパケットＰＫＴを基地局６０（＝第２の基地局）へ送信する（ステップＳ５）。 The wireless module 3 of the wireless device 10 extracts the packet PKT from the queue 5 and transmits the extracted packet PKT to the base station 60 (= second base station) (step S5).
その後、無線装置１０の測定手段７は、無線モジュール４（＝第１の無線モジュール）がアクセスポイント５０（＝第１の基地局）との間で無線通信を行なうときの混雑度Ｃｉｎｄ２を上述した方法によって測定し（ステップＳ６）、その測定した混雑度Ｃｉｎｄ２を分配手段２へ出力する。Thereafter, the measurement means 7 of the wireless device 10 determines the congestion degree Cind 2 when the wireless module 4 (= first wireless module) performs wireless communication with the access point 50 (= first base station). Measurement is performed by the method described above (step S6), and the measured congestion degree Cind 2 is output to the distribution means 2.
そして、無線装置１０の分配手段２は、混雑度Ｃｉｎｄがしきい値Ｔｒよりも小さいか否かを判定する（ステップＳ７）。ステップＳ７において、混雑度Ｃｉｎｄがしきい値Ｔｒ以上であると判定されたとき、無線装置１０の分配手段２は、無線モジュール３（＝第２の無線モジュール）へのパケットＰＫＴの分配を維持する（ステップＳ８）。その後、一連の動作は、ステップＳ６へ戻る。Then, the distribution unit 2 of the wireless device 10 determines whether or not the congestion degree Cind is smaller than the threshold valueTr (step S7). When it is determined in step S7 that the degree of congestion Cind isequal to or greater than the threshold valueTr , the distribution unit 2 of the wireless device 10 distributes the packet PKT to the wireless module 3 (= second wireless module). Maintain (step S8). Thereafter, the series of operations returns to step S6.
一方、ステップＳ７において、混雑度Ｃｉｎｄがしきい値Ｔｒよりも小さいと判定されたとき、無線装置１０の分配手段２は、無線モジュール３（＝第２の無線モジュール）へのパケットＰＫＴの分配を停止し、無線モジュール４（＝第１の無線モジュール）へパケットＰＫＴを分配する（ステップＳ９）。On the other hand, when it is determined in step S7 that the degree of congestion Cind is smaller than the threshold valueTr , the distribution unit 2 of the wireless device 10 transmits the packet PKT to the wireless module 3 (= second wireless module). The distribution is stopped, and the packet PKT is distributed to the wireless module 4 (= first wireless module) (step S9).
そして、無線モジュール４（＝第１の無線モジュール）は、キュー６からパケットＰＫＴを取り出し、その取り出したパケットＰＫＴをアクセスポイント５０（＝第１の基地局）へ送信する（ステップＳ１０）。これによって、一連の動作が終了する。 Then, the wireless module 4 (= first wireless module) extracts the packet PKT from the queue 6 and transmits the extracted packet PKT to the access point 50 (= first base station) (step S10). As a result, a series of operations is completed.
なお、図１に示す無線装置２０，３０，４０の各々も、図４に示すフローチャートに従って無線通信を行なう。 Note that each of the wireless devices 20, 30, and 40 shown in FIG. 1 also performs wireless communication according to the flowchart shown in FIG.
上述したように、この発明においては、無線モジュール４がアクセスポイント５０との間で無線通信を行なうときの混雑度Ｃｉｎｄがしきい値Ｔｆよりも大きくなると、無線装置１０は、無線モジュール４へのパケットＰＫＴの分配を停止し、パケットＰＫＴを無線モジュール３へ分配してパケットＰＫＴを基地局６０へ送信する（ステップＳ２の“ＹＥＳ”，Ｓ４，Ｓ５参照）。As described above, in the present invention, when the degree of congestion Cind when the wireless module 4 performs wireless communication with the access point 50 becomes larger than the threshold value Tf , the wireless device 10 Distribution of the packet PKT is stopped, the packet PKT is distributed to the wireless module 3, and the packet PKT is transmitted to the base station 60 (see “YES” in steps S2, S4, S5).
従って、無線装置１０は、混雑している基地局（＝アクセスポイント５０）ではなく、空いている基地局６０へパケットＰＫＴを送信することができ、無線装置１０から基地局（＝アクセスポイント５０）への無線通信のスループットの低下を抑制して無線リンクを無線装置１０−アクセスポイント５０間の無線リンクＭＬ１１０−５０から無線装置１０−基地局６０間の無線リンクＭＬ１１０−６０に切換えることができる。Accordingly, the wireless device 10 can transmit the packet PKT to the vacant base station 60 instead of the congested base station (= access point 50), and the wireless device 10 can transmit the packet PKT to the base station (= access point 50). It is possible to switch the wireless link from the wireless link ML110-50 between the wireless device 10 and the access point 50 to the wireless link ML110-60 between the wireless device 10 and the base station 60 while suppressing a decrease in the throughput of wireless communication to the wireless device. it can.
また、無線装置１０が無線リンクを無線リンクＭＬ１１０−５０から無線リンクＭＬ１１０−６０に切換えることによって、無線装置２０，３０，４０がアクセスポイント５０との間で無線通信を行なうときの混雑度Ｃｉｎｄが小さくなるので、無線装置２０，３０，４０がアクセスポイント５０へアクセスできる割合を大きくできる。Also, the degree of congestion when the wireless device 20, 30, 40 performs wireless communication with the access point 50 by the wireless device10 switching the wireless link from the wireless link ML110-50 to the wireless link ML110-60. Since Cind is reduced, the rate at which the wireless devices 20, 30, 40 can access the access point 50 can be increased.
更に、一旦、無線リンクＭＬ１１０−５０から無線リンクＭＬ１１０−６０に切換えた後に、混雑度Ｃｉｎｄ２がしきい値Ｔｆよりも小さいしきい値Ｔｒよりも小さくなったときに、無線リンクＭＬ１１０−６０からＭＬ１１０−５０に切換える（ステップＳ２の“ＹＥＳ”，Ｓ４〜Ｓ６，Ｓ７の“ＹＥＳ”，Ｓ９，Ｓ１０参照）。従って、無線リンクＭＬ１１０−５０と無線リンクＭＬ１１０−６０との間の頻繁な切換を抑制して、無線リンクを安定して切換えることができる。Further, once the radio link ML110-50 is switched to the radio link ML110-60 , when the congestion degree Cind 2 becomes smaller than a threshold valueTr that is smaller than the threshold valueTf , The link ML110-60 is switched to ML110-50 (see “YES” in step S2, “YES” in S4 to S6, S7, S9, S10). Therefore, frequent switching between the radio link ML110-50 and the radio link ML110-60 can be suppressed, and the radio link can be switched stably.
図５は、混雑度の実測結果を示す図である。また、図６は、混雑度を用いたときのＷｉＦｉによる無線リンクへ分配されるパケットの割合を示す図である。図５において、縦軸は、混雑度（ｍｓ）を表し、横軸は、時間（ｓｅｃ）を表す。また、曲線ｋ１は、混雑度のタイミングチャートを示す。 FIG. 5 is a diagram illustrating the actual measurement result of the congestion degree. FIG. 6 is a diagram showing a ratio of packets distributed to the wireless link by WiFi when the congestion degree is used. In FIG. 5, the vertical axis represents the degree of congestion (ms), and the horizontal axis represents time (sec). A curve k1 shows a timing chart of the degree of congestion.
図６において、縦軸は、ＷｉＦｉの重み、即ち、ＷｉＦｉによる無線リンクへ分配されるパケットの割合を表し、横軸は、時間（ｓｅｃ）を表す。また、曲線ｋ２は、混雑度を用いたときにＷｉＦｉによる無線リンクへ分配されるパケットの割合のタイミングチャートを示す。なお、図６に示す曲線ｋ２は、しきい値Ｔｆ＝５（ｍｓ）、しきい値Ｔｒ＝Ｔｆ／２＝２．５（ｍｓ）であるときに実測されたものである。In FIG. 6, the vertical axis represents WiFi weight, that is, the ratio of packets distributed to wireless links by WiFi, and the horizontal axis represents time (sec). A curve k2 shows a timing chart of a ratio of packets distributed to the wireless link by WiFi when the congestion degree is used. The curve k2 shown in FIG. 6 is actually measured when the threshold value Tf = 5 (ms) and the threshold value Tr = Tf /2=2.5 (ms).
混雑度Ｃｉｎｄは、５０ｓｅｃ付近および７０ｓｅｃ付近で突発的に大きくなっているが、それ以外の領域では、比較的、安定している（図５参照）。The degree of congestion Cind suddenly increases around 50 sec and 70 sec, but is relatively stable in other regions (see FIG. 5).
図５に示す混雑度Ｃｉｎｄを用いてＷｉＦｉによる無線リンクとＷｉＭＡＸによる無線リンクとの切換を行なった結果が図６に示す曲線ｋ２である。The result of switching between the WiFi wireless link and the WiMAX wireless link using the congestion degreeCind shown in FIG. 5 is a curve k2 shown in FIG.
図６において、ＷｉＦｉの重みが１．０であることは、パケットＰＫＴを無線モジュール４へ分配することを意味し、ＷｉＦｉの重みが０であることは、パケットＰＫＴを無線モジュール３へ分配することを意味する。 In FIG. 6, the WiFi weight is 1.0 means that the packet PKT is distributed to the wireless module 4, and the WiFi weight is 0 is that the packet PKT is distributed to the wireless module 3. Means.
混雑度Ｃｉｎｄは、５０ｓｅｃまでは、しきい値Ｔｆである５（ｍｓ）よりも小さいので、ＷｉＦｉの重みが“１．０”である。そして、混雑度Ｃｉｎｄが５０ｓｅｃ付近でしきい値Ｔｆよりも大きくなると、ＷｉＦｉの重みが“０”となり、無線リンクが無線リンクＭＬ１１０−５０から無線リンクＭＬ１１０−６０に切換えられる。The congestion degree Cind is smaller than the threshold value Tf of 5 (ms) until 50 sec, so the WiFi weight is “1.0”. When the congestion degree Cind becomes greater than the threshold value Tf near 50 sec, the WiFi weight becomes “0”, and the radio link is switched from the radio link ML110-50 to the radio link ML110-60 .
その後、混雑度Ｃｉｎｄは、しきい値Ｔｒ＝Ｔｆ／２＝２．５（ｍｓ）よりも小さくなるので、ＷｉＦｉの重みが“１．０”になり、無線リンクが無線リンクＭＬ１１０−６０から無線リンクＭＬ１１０−５０に切換えられる。After that, the congestion degree Cind becomes smaller than the threshold value Tr = Tf /2=2.5 (ms), so the WiFi weight becomes “1.0”, and the radio link becomes the radio link ML110. -60 to radio link ML110-50 .
更に、その後、混雑度Ｃｉｎｄは、７０ｓｅｃ付近で、再び、しきい値Ｔｆを超えるので、ＷｉＦｉの重みが“０”になり、無線リンクが無線リンクＭＬ１１０−５０から無線リンクＭＬ１１０−６０に切換えられる。その後、混雑度Ｃｉｎｄは、約１３０ｓｅｃまでしきい値Ｔｒ＝Ｔｆ／２＝２．５（ｍｓ）よりも小さくならないので、ＷｉＦｉの重みは、“０”のままであり、混雑度Ｃｉｎｄが１３０ｓｅｃ以降になってしきい値Ｔｒ＝Ｔｆ／２＝２．５（ｍｓ）よりも小さくなると、ＷｉＦｉの重みは、“１．０”となり、無線リンクが無線リンクＭＬ１１０−６０から無線リンクＭＬ１１０−５０に切換えられる。Further, the congestion degree Cind then exceeds the threshold value Tf again in the vicinity of 70 sec. Therefore, the weight of WiFi becomes “0”, and the radio link is changed from the radio link ML110-50 to the radio link ML110−. 60 . Thereafter, the congestion degree Cind does not become smaller than the threshold value Tr = Tf /2=2.5 (ms) until about 130 sec. Therefore, the WiFi weight remains “0”, and the congestion degree CWhen ind becomes 130 sec or less and becomes smaller than the threshold value Tr = Tf /2=2.5 (ms), the WiFi weight becomes “1.0”, and the radio link is the radio link ML110-60. To the radio link ML110-50 .
このように、実測された混雑度Ｃｉｎｄを用いることにより、無線リンクＭＬ１１０−６０と無線リンクＭＬ１１０−５０との頻繁な切換を抑制できることが実証された。混雑度Ｃｉｎｄは、アクセスポイント５０の通信範囲における無線通信の通信状況を反映したものであるので、図５に示すように、揺らぎが相対的に小さい。従って、混雑度Ｃｉｎｄを用いて無線リンクを切換えた場合、無線リンクの頻繁な切換を抑制できる。In this way, by using the actually measured congestion degreeC ind, it has been demonstrated that can suppress frequent switching of the radio linkML1 10-60 and radio linksML1 10-50. The congestion degree Cind reflects the communication state of the wireless communication in the communication range of the access point 50, and therefore, fluctuation is relatively small as shown in FIG. Therefore, when the radio link is switched using the congestion degree Cind , frequent switching of the radio link can be suppressed.
図７は、ＲＴＴの実測結果を示す図である。また、図８は、ＲＴＴを用いたときのＷｉＦｉによる無線リンクへ分配されるパケットの割合を示す図である。 FIG. 7 is a diagram showing an actual measurement result of RTT. FIG. 8 is a diagram showing a ratio of packets distributed to a wireless link by WiFi when RTT is used.
図７において、縦軸は、ＲＴＴ（ｍｓ）を表し、横軸は、時間（ｓｅｃ）を表す。また、曲線ｋ３は、ＲＴＴのタイミングチャートを示す。図８において、縦軸は、ＷｉＦｉの重み、即ち、ＷｉＦｉによる無線リンクへ分配されるパケットの割合を表し、横軸は、時間（ｓｅｃ）を表す。また、曲線ｋ４は、ＲＴＴを用いたときにＷｉＦｉによる無線リンクへ分配されるパケットの割合のタイミングチャートを示す。なお、図８に示す曲線ｋ４は、しきい値Ｔｆ＝３０（ｍｓ）、しきい値Ｔｒ＝Ｔｆ／２＝１５（ｍｓ）であるときに実測されたものである。In FIG. 7, the vertical axis represents RTT (ms) and the horizontal axis represents time (sec). A curve k3 shows an RTT timing chart. In FIG. 8, the vertical axis represents WiFi weight, that is, the ratio of packets distributed to the wireless link by WiFi, and the horizontal axis represents time (sec). A curve k4 shows a timing chart of a ratio of packets distributed to the wireless link by WiFi when RTT is used. The curve k4 shown in FIG. 8 is actually measured when the threshold value Tf = 30 (ms) and the threshold value Tr = Tf / 2 = 15 (ms).
ＲＴＴは、５０ｓｅｃ付近から１１０ｓｅｃ付近までの期間、しきい値Ｔｆ（＝３０ｍｓ）よりも大きくなったり、しきい値Ｔｒ（＝１５ｍｓ）よりも小さくなったりし、大きく揺らいでいる（図７参照）。The RTT fluctuates greatly during the period from around 50 sec to around 110 sec, becoming larger than the threshold value Tf (= 30 ms) or smaller than the threshold value Tr (= 15 ms) (FIG. 7). reference).
その結果、ＷｉＦｉの重みは、５０ｓｅｃ付近から１１０ｓｅｃ付近までの期間、“１．０”と“０”との間で頻繁に切り換えられる（図８参照）。つまり、無線リンクは、５０ｓｅｃ付近から１１０ｓｅｃ付近までの期間、無線リンクＭＬ１１０−６０と無線リンクＭＬ１１０−５０との間で頻繁に切換えられる。As a result, the WiFi weight is frequently switched between “1.0” and “0” during the period from about 50 sec to about 110 sec (see FIG. 8). That is, the radio link is frequently switched between the radio link ML110-60 and the radio link ML110-50 during a period from about 50 sec to about 110 sec.
図９は、ＴＣＰスループットのタイミングチャートである。図９において、縦軸は、ＴＣＰスループット（Ｍｂｐｓ）を表し、横軸は、時間（ｓｅｃ）を表す。また、曲線ｋ５は、混雑度を用いた場合のＴＣＰスループットを示し、曲線ｋ６は、ＲＴＴを用いた場合のＴＣＰスループットを示す。 FIG. 9 is a timing chart of TCP throughput. In FIG. 9, the vertical axis represents TCP throughput (Mbps), and the horizontal axis represents time (sec). A curve k5 indicates the TCP throughput when the congestion level is used, and a curve k6 indicates the TCP throughput when the RTT is used.
約５０ｓｅｃから７０ｓｅｃまでの期間、ＴＣＰスループットは、混雑度を用いた方がＲＴＴを用いるよりも大きくなる（曲線ｋ５，ｋ６参照）。これは、図６および図８に示すように、混雑度を用いる方が無線リンクＭＬ１１０−６０と無線リンクＭＬ１１０−５０との間での無線リンクの切換が抑制されるからである。During the period from about 50 sec to 70 sec, the TCP throughput is larger when the congestion degree is used than when the RTT is used (see curves k5 and k6). This is because, as shown in FIG. 6 and FIG. 8, switching of the radio link between the radio link ML110-60 and the radio link ML110-50 is suppressed when the degree of congestion is used.
従って、上述した方法によって測定した混雑度を用いることによって、スループットの低下および無線リンクの頻繁な切換を抑制して無線リンクを切換えることができる。 Therefore, by using the degree of congestion measured by the above-described method, it is possible to switch the radio link while suppressing a decrease in throughput and frequent switching of the radio link.
なお、この発明においては、アクセスポイント５０は、「第１の基地局」を構成し、基地局６０は、「第２の基地局」を構成する。 In the present invention, the access point 50 constitutes a “first base station”, and the base station 60 constitutes a “second base station”.
また、無線モジュール４は、「第１の無線モジュール」を構成し、無線モジュール３は、「第２の無線モジュール」を構成する。 The wireless module 4 constitutes a “first wireless module”, and the wireless module 3 constitutes a “second wireless module”.
今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記した実施の形態の説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.
この発明は、通信特性の低下および無線リンクの頻繁な切換を抑制して無線リンクを切換可能な無線装置に適用される。また、この発明は、通信特性の低下および無線リンクの頻繁な切換を抑制して無線リンクを切換可能な無線通信方法に適用される。さらに、この発明は、通信特性の低下および無線リンクの頻繁な切換を抑制して無線リンクを切換可能な無線装置を備える無線ネットワークに適用される。 The present invention is applied to a radio apparatus capable of switching radio links while suppressing deterioration of communication characteristics and frequent switching of radio links. The present invention is also applied to a radio communication method capable of switching radio links while suppressing deterioration of communication characteristics and frequent switching of radio links. Furthermore, the present invention is applied to a radio network including a radio device capable of switching radio links while suppressing deterioration of communication characteristics and frequent switching of radio links.
１，５，６ キュー、２ 分配手段、３，４ 無線モジュール、７ 測定手段、１０，２０，３０，４０ 無線装置、５０ アクセスポイント、６０ 基地局、１００ 無線ネットワーク。 1, 5, 6 queues, 2 distribution means, 3, 4 wireless modules, 7 measurement means, 10, 20, 30, 40 wireless devices, 50 access points, 60 base stations, 100 wireless networks.
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