JP2016001830A - Radio network switching control device, radio terminal device, server device, radio communication system, radio network switching control method, and program - Google Patents

Radio network switching control device, radio terminal device, server device, radio communication system, radio network switching control method, and program Download PDF

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JP2016001830A
JP2016001830A JP2014121498A JP2014121498A JP2016001830A JP 2016001830 A JP2016001830 A JP 2016001830A JP 2014121498 A JP2014121498 A JP 2014121498A JP 2014121498 A JP2014121498 A JP 2014121498A JP 2016001830 A JP2016001830 A JP 2016001830A
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wireless network
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JP6467790B2 (en
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基広 鈴木
Motohiro Suzuki
基広 鈴木
優樹 大野
Masaki Ono
優樹 大野
加奈子 牧野
Kanako Makino
加奈子 牧野
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NEC Corp
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Abstract

PROBLEM TO BE SOLVED: To select an appropriate radio network from a plurality of radio networks and to perform switching in order not to deteriorate a user's cenesthesia.SOLUTION: A radio network switching control device comprises: a radio network connection detection unit that detects connectable radio networks; an estimation result acquisition unit that, if the radio network connection detection unit detects a second radio network during connection with a first radio network, acquires estimated bandwidth values of the connected radio network, which are regularly estimated before and after switching to the second radio network; an estimation result comparison unit that compares the estimated bandwidth values of the radio network before and after switching acquired by the estimation result acquisition unit; and a radio network switching notification unit that, after switching to the second radio network, makes the connection with the second radio network maintained or makes the connection switched back to the first radio network on the basis of a comparison result by the estimation result comparison unit.

Description

本発明は、無線網切替制御装置、無線端末装置、サーバ装置、無線通信システム、無線網切替制御方法、プログラムに関する。   The present invention relates to a wireless network switching control device, a wireless terminal device, a server device, a wireless communication system, a wireless network switching control method, and a program.

スマートフォンなどがＷｉ−Ｆｉ(登録商標)網のアクセスポイント（以下、無線アクセスポイントという）を検出すると、スマートフォンなどに備えられているＯＳ(Operating System)の無線接続機能が、ユーザ認証を行い、無線アクセスポイントに接続する。これは、キャリア事業者が提供する３Ｇ(3rd Generation)／ＬＴＥ(Long Term Evolution)（登録商標）などの公衆無線網よりも無線アクセスポイント経由で接続するＷｉ−Ｆｉ(登録商標)網の方が一般的に広帯域であることから、無線アクセスポイントに優先的に接続するためである。近年、複数の無線網が利用可能な状況になっており、各々の無線網の特性に応じて、適切な無線網を選択することで、より快適なデータ通信を実現する要求が高まっており、また、それを実現する技術として、例えば、特許文献１に示す技術などが提案されている。   When a smartphone or the like detects a Wi-Fi (registered trademark) network access point (hereinafter referred to as a wireless access point), a wireless connection function of an OS (Operating System) provided in the smartphone or the like performs user authentication and wireless Connect to the access point. This is because the Wi-Fi (registered trademark) network connected via the wireless access point is more than the public wireless network such as 3G (3rd Generation) / LTE (Long Term Evolution) (registered trademark) provided by the carrier. This is because a broadband is generally used, so that the wireless access point is preferentially connected. In recent years, multiple wireless networks have become available, and there is an increasing demand for more comfortable data communication by selecting an appropriate wireless network according to the characteristics of each wireless network. Moreover, as a technique for realizing this, for example, a technique shown in Patent Document 1 has been proposed.

特開２００５−０３９７９５号公報JP 2005-039795 A

特許文献１に記載の技術では、移動無線端末が、複数の無線網に接続することを想定し、複数の通信網の特性を比較する特性比較部を備えている。この特性比較部で、接続可能な通信網を検出した場合、接続可否判断を行うための指標に基づいて、検出した無線網に接続すべきかを決定している。なお、この指標には５種類（（１）電波状況、（２）通信コスト、（３）帯域幅、（４）実効帯域幅、（５）アプリケーション又はデータの種類）があり、これらの５種類の指標を使用した接続可否判断の実施方法は予め定められている。   The technique described in Patent Literature 1 includes a characteristic comparison unit that compares the characteristics of a plurality of communication networks on the assumption that a mobile radio terminal is connected to a plurality of radio networks. In this characteristic comparison unit, when a connectable communication network is detected, whether to connect to the detected wireless network is determined based on an index for determining whether or not connection is possible. There are five types of indicators ((1) radio wave status, (2) communication cost, (3) bandwidth, (4) effective bandwidth, and (5) type of application or data). A method for determining whether or not connection is possible using the above-described index is determined in advance.

しかしながら、特許文献１に記載の技術では、これらの指標を確認するタイミングが示されていないため、以下の問題が存在する。接続可否判断の指標として一般的に用いられている無線網の特性から予め定めておく場合、実際に無線網を切り替えた際に無線端末装置を使用するユーザの体感が劣化する懸念がある。例えば、Ｗｉ−Ｆｉ（登録商標）網と、キャリア事業者が提供する公衆無線網とについてみた場合、一般的には、Ｗｉ−Ｆｉ（登録商標）網の方が広帯域である。そのため、Ｗｉ−Ｆｉ（登録商標）網を検出した場合には、公衆無線網からＷｉ−Ｆｉ（登録商標）網に切り替えると予め定めておくことで、切り替えることによりユーザの体感は向上することが想定されている。しかし、近年、自宅においてユーザが自ら構築するような広帯域で安定しているＷｉ−Ｆｉ（登録商標）網以外に、無料のＷｉ−Ｆｉ（登録商標）網提供事業者が存在し、使用料金が不要なことから利用者が急増し、Ｗｉ−Ｆｉ（登録商標）網が混雑する状況が発生している。   However, the technique described in Patent Document 1 does not show the timing for confirming these indexes, and therefore has the following problems. In the case where it is determined in advance from the characteristics of a wireless network that is generally used as an index for determining whether or not connection is possible, there is a concern that the user's experience using the wireless terminal device may deteriorate when the wireless network is actually switched. For example, when viewing a Wi-Fi (registered trademark) network and a public wireless network provided by a carrier, the Wi-Fi (registered trademark) network generally has a wider bandwidth. Therefore, when a Wi-Fi (registered trademark) network is detected, it is determined in advance that the public wireless network is switched to the Wi-Fi (registered trademark) network, so that the user experience can be improved by switching. Assumed. However, in recent years, there are free Wi-Fi (registered trademark) network providers other than Wi-Fi (registered trademark) networks that are stable in a wide band that the user constructs themselves at home, and the usage fee is low. There is a situation in which the number of users increases rapidly because it is unnecessary, and the Wi-Fi (registered trademark) network is congested.

この状況で、事前にＷｉ−Ｆｉ（登録商標）網の特性を公衆無線網よりも広帯域であると定めておき、Ｗｉ−Ｆｉ（登録商標）網に接続可能になった際に、上記のような混雑しているＷｉ−Ｆｉ（登録商標）網に接続してしまうと、指標上はＷｉ−Ｆｉ網の方が広帯域と指定されているにも関わらず、実際には狭帯域となってしまい、利用者の体感が劣化してしまうという問題がある。   In this situation, the characteristics of the Wi-Fi (registered trademark) network are determined in advance to be wider than that of the public wireless network, and when the connection to the Wi-Fi (registered trademark) network becomes possible, as described above. If the network is connected to a busy Wi-Fi (registered trademark) network, although the Wi-Fi network is designated as a broadband on the index, the bandwidth is actually narrow. There is a problem that the user's experience deteriorates.

本発明は、上記問題を解決することのできる、無線網切替制御装置、無線端末装置、サーバ装置、無線通信システム、無線網切替制御方法、プログラムを提供することにある。   An object of the present invention is to provide a radio network switching control device, a radio terminal device, a server device, a radio communication system, a radio network switching control method, and a program that can solve the above problems.

上記問題を解決するために、本発明の一態様は、接続可能な無線網を検知する無線網接続検知部と、第１の無線網の接続中に、前記無線網接続検知部が第２の無線網を検知した場合、前記第２の無線網への切り替え前後に、定期的に推定されている接続中の無線網の推定帯域値を取得する推定結果取得部と、前記推定結果取得部が取得する切り替え前後の無線網の推定帯域値を比較する推定結果比較部と、前記第２の無線網への切り替えが行われた後に、前記推定結果比較部が比較した結果に基づいて、前記第２の無線網への接続の維持、または、前記第１の無線網への切り戻しをさせる無線網切替通知部と、を備えることを特徴とする無線網切替制御装置である。   In order to solve the above problem, according to one aspect of the present invention, a wireless network connection detection unit that detects a connectable wireless network, and the wireless network connection detection unit is connected to the second wireless network during the connection of the first wireless network. When a wireless network is detected, an estimation result acquisition unit that acquires an estimated bandwidth value of a connected wireless network that is periodically estimated before and after switching to the second wireless network, and the estimation result acquisition unit Based on a result of comparison between the estimation result comparison unit that compares the estimated bandwidth values of the wireless network before and after switching to be acquired and the estimation result comparison unit after the switching to the second wireless network is performed. A wireless network switching control unit that maintains a connection to the second wireless network or switches back to the first wireless network.

また、本発明の一態様は、無線網と接続し、新たに無線網を検出した場合に通知を行う無線通信部と、前記無線通信部が接続している無線網の帯域値を定期的に推定し、推定を行った時刻を示す時刻情報を計時手段から取得し、推定帯域値と時刻情報とを対応付けて出力する帯域推定部と、前記帯域推定部が出力する前記推定帯域値と、前記時刻情報とを対応付けて記憶する帯域推定結果記憶部と、前記無線通信部が検出した接続可能な新たな無線網を検知する無線網接続検知部と、前記無線通信部が第１の無線網の接続中に、前記無線網接続検知部が第２の無線網を検知した場合、前記第２の無線網への切り替え前後に、前記帯域推定結果記憶部から接続中の無線網の推定帯域値を取得する推定結果取得部と、前記推定結果取得部が取得する切り替え前後の無線網の推定帯域値を比較する推定結果比較部と、前記第２の無線網への切り替えを通知した後に、前記推定結果比較部が比較した結果に基づいて、前記第１の無線網へ切り戻しの通知を行う無線網切替通知部と、前記無線網切替通知部が通知する無線網へ前記無線通信部の接続を切り替えさせる無線網切替部と、を備えることを特徴とする無線端末装置である。   Further, according to one embodiment of the present invention, a wireless communication unit that is connected to a wireless network and notifies when a new wireless network is detected, and a bandwidth value of the wireless network to which the wireless communication unit is connected are periodically set. Estimating and obtaining time information indicating the time of estimation from the time measuring means, a band estimation unit that outputs the estimated band value and the time information in association with each other, and the estimated band value output by the band estimation unit, A band estimation result storage unit that associates and stores the time information, a wireless network connection detection unit that detects a new connectable wireless network detected by the wireless communication unit, and the wireless communication unit is a first wireless unit When the wireless network connection detection unit detects the second wireless network during network connection, the estimated bandwidth of the connected wireless network from the band estimation result storage unit before and after switching to the second wireless network. An estimation result acquisition unit for acquiring a value and the estimation result acquisition unit Based on the result of comparison between the estimation result comparison unit for comparing the estimated bandwidth values of the wireless network before and after switching and the estimation result comparison unit after notifying the switching to the second wireless network, the first radio A wireless network switching notification unit that notifies a switchback to the network; and a wireless network switching unit that switches the connection of the wireless communication unit to the wireless network notified by the wireless network switching notification unit. It is a terminal device.

また、本発明の一態様は、切り替えに関する情報の送受信を行う端末側切替送受信部と、無線網と接続し、新たに無線網を検出した場合に前記端末側切替送受信部を通じて通知を行う無線通信部と、前記無線通信部が接続している無線網の帯域値を定期的に推定し、推定帯域値を送信する帯域推定部と、前記端末側切替送受信部が通知する無線網へ前記無線通信部の接続を切り替えさせる無線網切替部と、を備える無線端末装置の無線網の切り替えを行わせるサーバ装置であって、切り替えに関する情報の送受信を行うサーバ側切替送受信部と、前記帯域推定部が送信する前記推定帯域値と、計時手段から取得する推定が行われた際の時刻情報とを対応付けて記憶する帯域推定結果記憶部と、前記サーバ側切替送受信部を通じて前記無線通信部から受信する前記無線通信部が検出した接続可能な新たな無線網を検知する無線網接続検知部と、前記無線通信部が第１の無線網の接続中に、前記無線網接続検知部が第２の無線網を検知した場合、前記第２の無線網への切り替え前後に、前記帯域推定結果記憶部から接続中の無線網の推定帯域値を取得する推定結果取得部と、前記推定結果取得部が取得する切り替え前後の無線網の推定帯域値を比較する推定結果比較部と、前記サーバ側切替送受信部を通じて前記無線網切替部に前記第２の無線網への切り替えを通知した後に、前記推定結果比較部が比較した結果に基づいて、前記第１の無線網へ切り戻しの通知を前記サーバ側切替送受信部を通じて前記無線網切替部に行う無線網切替通知部と、を備えることを特徴とするサーバ装置である。   In addition, according to one aspect of the present invention, a terminal-side switching transmission / reception unit that transmits / receives information related to switching and a wireless communication that connects to a wireless network and performs notification through the terminal-side switching transmission / reception unit when a new wireless network is detected. The wireless communication unit to the wireless network that periodically estimates the bandwidth value of the wireless network to which the wireless communication unit is connected, transmits the estimated bandwidth value, and the wireless network notified by the terminal-side switching transceiver unit A wireless network switching unit for switching a connection of a wireless terminal device, a server device for switching a wireless network, a server-side switching transmission / reception unit for transmitting / receiving information related to switching, and the bandwidth estimation unit The wireless communication through the bandwidth estimation result storage unit that stores the estimated bandwidth value to be transmitted and the time information when the estimation acquired from the time measuring unit is performed in association with each other, and the server side switching transmission / reception unit A wireless network connection detection unit for detecting a new connectable wireless network detected by the wireless communication unit received from the wireless communication unit, and the wireless network connection detection unit is connected to the first wireless network while the wireless communication unit is connected to the first wireless network. When the second wireless network is detected, an estimation result acquisition unit that acquires an estimated band value of the connected wireless network from the band estimation result storage unit before and after switching to the second wireless network, and the estimation result acquisition An estimation result comparison unit that compares the estimated bandwidth value of the wireless network before and after switching acquired by the unit, and after notifying the switching to the second wireless network to the wireless network switching unit through the server-side switching transmission / reception unit, A wireless network switching notifying unit for notifying the wireless network switching unit through the server-side switching transmission / reception unit of switching back to the first wireless network based on a result of comparison by the estimation result comparison unit. Server device That.

また、本発明の一態様は、無線端末装置と、サーバ装置を備える無線通信システムであって、前記無線端末装置は、切り替えに関する情報の送受信を行う端末側切替送受信部と、無線網と接続し、新たに無線網を検出した場合に前記端末側切替送受信部を通じて通知を行う無線通信部と、前記無線通信部が接続している無線網の帯域値を定期的に推定し、推定帯域値を送信する帯域推定部と、前記端末側切替送受信部が通知する無線網へ前記無線通信部の接続を切り替えさせる無線網切替部と、を有し、前記サーバ装置は、切り替えに関する情報の送受信を行うサーバ側切替送受信部と、前記帯域推定部が送信する前記推定帯域値と、計時手段から取得する推定が行われた際の時刻情報とを対応付けて記憶する帯域推定結果記憶部と、前記サーバ側切替送受信部を通じて前記無線通信部から受信する前記無線通信部が検出した接続可能な新たな無線網を検知する無線網接続検知部と、前記無線通信部が第１の無線網の接続中に、前記無線網接続検知部が第２の無線網を検知した場合、前記第２の無線網への切り替え前後に、前記帯域推定結果記憶部から接続中の無線網の推定帯域値を取得する推定結果取得部と、前記推定結果取得部が取得する切り替え前後の無線網の推定帯域値を比較する推定結果比較部と、前記サーバ側切替送受信部を通じて前記無線網切替部に前記第２の無線網への切り替えを通知した後に、前記推定結果比較部が比較した結果に基づいて、前記第１の無線網へ切り戻しの通知を前記サーバ側切替送受信部を通じて前記無線網切替部に行う無線網切替通知部と、有することを特徴とする無線通信システムである。   One embodiment of the present invention is a wireless communication system including a wireless terminal device and a server device, wherein the wireless terminal device is connected to a wireless network and a terminal-side switching transmission / reception unit that transmits and receives information related to switching. A wireless communication unit that performs notification through the terminal-side switching transmission / reception unit when a new wireless network is detected, and periodically estimates a bandwidth value of a wireless network to which the wireless communication unit is connected, and an estimated bandwidth value A transmission band estimation unit; and a wireless network switching unit that switches connection of the wireless communication unit to a wireless network notified by the terminal-side switching transmission / reception unit, and the server device transmits and receives information related to switching A server-side switching transmission / reception unit, a band estimation result storage unit that stores the estimated band value transmitted by the band estimation unit, and time information at the time of estimation obtained from the time measuring means, in association with each other; A wireless network connection detection unit that detects a new connectable wireless network detected by the wireless communication unit that is received from the wireless communication unit through a bar-side switching transmission / reception unit; and the wireless communication unit is connected to the first wireless network. In addition, when the wireless network connection detection unit detects the second wireless network, the estimated bandwidth value of the connected wireless network is acquired from the bandwidth estimation result storage unit before and after switching to the second wireless network. An estimation result acquisition unit, an estimation result comparison unit that compares the estimated bandwidth values of the wireless network before and after switching acquired by the estimation result acquisition unit, and the second wireless network switching unit through the server-side switching transmission / reception unit After notifying the switching to the network, based on the result of the comparison by the estimation result comparison unit, the wireless network switching unit notifies the wireless network switching unit through the server-side switching transmission / reception unit of the switch back to the first wireless network. Switch notification section and It is a wireless communication system, comprising.

また、本発明の一態様は、第１の無線網の接続中に、接続可能な第２の無線網を検知した場合、前記第２の無線網への切り替え前後に、定期的に予め推定されている接続中の無線網の推定帯域値を取得し、取得した切り替え前後の無線網の推定帯域値を比較し、前記第２の無線網への切り替えが行われた後に、比較した結果に基づいて、前記第２の無線網への接続の維持、または、前記第１の無線網への切り戻しをさせることを特徴とする無線網切替制御方法である。   In addition, according to one aspect of the present invention, when a connectable second wireless network is detected during connection of the first wireless network, it is periodically estimated in advance before and after switching to the second wireless network. The estimated bandwidth value of the connected wireless network is acquired, the estimated bandwidth value of the wireless network before and after the acquired switching is compared, and after the switching to the second wireless network is performed, based on the comparison result Then, the wireless network switching control method is characterized in that the connection to the second wireless network is maintained or the switch back to the first wireless network is performed.

また、本発明の一態様は、コンピュータに、第１の無線網の接続中に、接続可能な第２の無線網を検知した場合、前記第２の無線網への切り替え前後に、定期的に予め推定されている接続中の無線網の推定帯域値を取得する手順、取得した切り替え前後の無線網の推定帯域値を比較する手順、前記第２の無線網への切り替えが行われた後に、比較した結果に基づいて、前記第２の無線網への接続の維持、または、前記第１の無線網への切り戻しをさせる手順、を実行させるためのプログラムである。   In addition, according to one embodiment of the present invention, when a connectable second wireless network is detected while the first wireless network is connected to the computer, the computer periodically checks before and after switching to the second wireless network. After obtaining the estimated bandwidth value of the currently connected wireless network, the procedure of comparing the obtained estimated bandwidth value of the wireless network before and after switching, and the switching to the second wireless network, A program for executing a procedure for maintaining connection to the second wireless network or switching back to the first wireless network based on a result of comparison.

この発明によれば、利用者の体感を劣化させないように複数の無線網から適切な無線網を選択して切り替えを行うことが可能となる。   According to the present invention, it is possible to select and switch an appropriate wireless network from a plurality of wireless networks so as not to deteriorate the user's experience.

本発明の第１実施形態の構成を示す概略ブロック図である。It is a schematic block diagram which shows the structure of 1st Embodiment of this invention. 同実施形態の帯域推定結果記憶部の構成を示す図である。It is a figure which shows the structure of the band estimation result memory | storage part of the embodiment. 同実施形態の無線網切替制御装置の内部構成、及び外部接続の構成を示す図である。It is a figure which shows the internal structure of the radio network switching control apparatus of the embodiment, and the structure of external connection. 同実施形態の無線端末装置の処理を示すフローチャートである。It is a flowchart which shows the process of the radio | wireless terminal apparatus of the embodiment. 本発明の第２実施形態の構成を示す概略ブロック図である。It is a schematic block diagram which shows the structure of 2nd Embodiment of this invention.

（第１実施形態）
以下、本発明の第１実施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実施形態による無線通信システム１を示す概略ブロック図である。無線通信システム１は、無線端末装置１００、無線網Ａ、無線ＡＰ（Access Point）装置５０１、無線網Ｂ、基地局装置６０１を備える。無線網Ａは、例えば、Ｗｉ−Ｆｉ(登録商標)の無線網であり、無線ＡＰ装置５０１を介して無線端末装置１００と接続する。無線網Ｂは、例えば、３Ｇ(3rd Generation)／ＬＴＥ(Long Term Evolution)（登録商標）などの公衆無線網であり、基地局装置６０１を介して無線端末装置１００と接続する。 (First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic block diagram showing a wireless communication system 1 according to the first embodiment of the present invention. The wireless communication system 1 includes a wireless terminal device 100, a wireless network A, a wireless AP (Access Point) device 501, a wireless network B, and a base station device 601. The wireless network A is, for example, a Wi-Fi (registered trademark) wireless network, and is connected to the wireless terminal device 100 via the wireless AP device 501. The wireless network B is a public wireless network such as 3G (3rd Generation) / LTE (Long Term Evolution) (registered trademark), and is connected to the wireless terminal device 100 via the base station device 601.

無線端末装置１００において、無線通信部１０６は、無線網Ａの無線ＡＰ装置５０１、または、無線網Ｂの基地局装置６０１のいずれか１つの無線網との接続を行う。また、無線通信部１０６は、接続中である場合も接続中でない場合も、接続可能な新たな無線網を検出した場合、検出した無線網を一意に識別可能な無線網識別情報を含む検知信号を出力する。ここで、無線網識別情報は、予め無線網が識別できるように無線網ごとに付与されている識別情報であってもよいし、無線端末装置１００が、無線網の通信手段の違いなど接続の際に得られる情報に基づいて自ら識別できるように付与する識別情報であってもよい。また、無線通信部１０６は、無線網切替部１０５からの切替指示信号を受けると、当該切替指示信号に含まれる無線網識別情報に対応する無線網への切り替えを行う。ＯＳ（Operating System）１０４は、無線端末装置１００が備える各機能部の制御を行い、例えば、無線端末装置１００が、スマートフォンの場合、スマートフォンのアプリケーションソフトウェアの制御なども行う。計時部１０７は、要求を受けて、現在の年月日と時刻を示す時刻情報を出力する。   In the wireless terminal device 100, the wireless communication unit 106 connects to any one wireless network of the wireless AP device 501 of the wireless network A or the base station device 601 of the wireless network B. In addition, when the wireless communication unit 106 detects a new connectable wireless network, whether or not connected, a detection signal including wireless network identification information that can uniquely identify the detected wireless network Is output. Here, the wireless network identification information may be identification information given to each wireless network in advance so that the wireless network can be identified. The identification information may be given so that the user can identify himself / herself based on the information obtained at the time. In addition, when the wireless communication unit 106 receives the switching instruction signal from the wireless network switching unit 105, the wireless communication unit 106 performs switching to the wireless network corresponding to the wireless network identification information included in the switching instruction signal. The OS (Operating System) 104 controls each functional unit included in the wireless terminal device 100. For example, when the wireless terminal device 100 is a smartphone, the OS (Operating System) 104 also controls application software of the smartphone. In response to the request, the time measuring unit 107 outputs time information indicating the current date and time.

帯域推定部１０３は、例えば、特開２０１１−１４２６２２号公報などの参考文献に示される手法により定期的に無線端末装置１００が接続している無線網の利用可能な帯域値を推定する。また、帯域推定部１０３は、帯域値の推定を行う際に、ＯＳ１０４を通じて無線通信部１０６から現在接続中の無線網、すなわち推定対象の無線網を示す無線網識別情報を取得する。また、帯域推定部１０３は、推定を行う際の年月日と時刻を示す時刻情報をＯＳ１０４を通じて計時部１０７から取得する。また、帯域推定部１０３は、推定対象の無線網識別情報と、推定を行った際の時刻情報と、推定した推定帯域値とを対応付けて帯域推定結果記憶部１０２に書き込む。帯域推定結果記憶部１０２は、例えば、図２に示すテーブル構成を有しており、無線網を示す無線網識別情報が書き込まれる「無線網識別情報」の項目と、帯域推定を行った際の年月日と時刻を示す時刻情報が書き込まれる「推定帯域取得時刻」の項目と、推定を行った推定帯域値が書き込まれる「推定帯域値」の項目を有する。無線網切替部１０５は、ＯＳ１０４を通じて無線通信部１０６に対して、切り替え先の無線網の無線網識別情報を含む切替指示信号を無線通信部１０６に出力する。   The bandwidth estimation unit 103 periodically estimates the available bandwidth value of the wireless network to which the wireless terminal device 100 is connected, for example, by a technique disclosed in a reference document such as Japanese Patent Application Laid-Open No. 2011-142622. Further, when estimating the bandwidth value, the bandwidth estimation unit 103 acquires wireless network identification information indicating the currently connected wireless network, that is, the wireless network to be estimated, from the wireless communication unit 106 through the OS 104. Further, the bandwidth estimation unit 103 acquires time information indicating the date and time when the estimation is performed from the time measuring unit 107 through the OS 104. Further, the band estimation unit 103 writes the estimation target wireless network identification information, the time information at the time of estimation, and the estimated estimated band value in the band estimation result storage unit 102 in association with each other. The bandwidth estimation result storage unit 102 has, for example, the table configuration shown in FIG. 2, and includes items of “wireless network identification information” in which wireless network identification information indicating a wireless network is written, and when bandwidth estimation is performed. It has an “estimated band acquisition time” item in which time information indicating the date and time is written, and an “estimated band value” item in which the estimated band value for which estimation has been performed is written. The wireless network switching unit 105 outputs a switching instruction signal including wireless network identification information of the switching destination wireless network to the wireless communication unit 106 through the OS 104 to the wireless communication unit 106.

無線網切替制御装置１０１は、無線端末装置１００の機能部の１つとして動作する装置であり、図３に示す内部構成を有している。無線網切替制御装置１０１は、推定結果取得部２０１、推定結果比較部２０２、無線網接続検知部２０３、無線網切替通知部２０４を備えている。推定結果取得部２０１は、帯域推定結果記憶部１０２に接続され、時刻情報を含む取得要求を受けた際に、帯域推定結果記憶部１０２から時刻情報と要求元の機能部の種類とに応じた推定帯域値を読み出す。推定結果比較部２０２は、推定結果取得部２０１が取得した推定帯域値に基づいて比較を行い、比較した結果に基づいて、切り替えた無線網の接続を維持するか、元の無線網へ切り戻すかを判定する。無線網接続検知部２０３は、無線通信部１０６が接続可能な無線網を検出した際に出力する無線網識別情報を含む検知信号をＯＳ１０４を通じて受信する。無線網切替通知部２０４は、無線網切替部１０５に接続され、無線網切替部１０５に対して切り替え先の無線網識別情報を含む切替通知信号を出力する。   The wireless network switching control device 101 is a device that operates as one of functional units of the wireless terminal device 100, and has an internal configuration shown in FIG. The wireless network switching control apparatus 101 includes an estimation result acquisition unit 201, an estimation result comparison unit 202, a wireless network connection detection unit 203, and a wireless network switching notification unit 204. When the estimation result acquisition unit 201 is connected to the band estimation result storage unit 102 and receives an acquisition request including time information, the estimation result acquisition unit 201 responds to the time information from the band estimation result storage unit 102 and the type of the functional unit that requested Read the estimated bandwidth value. The estimation result comparison unit 202 performs comparison based on the estimated bandwidth value acquired by the estimation result acquisition unit 201, and maintains the switched wireless network connection or switches back to the original wireless network based on the comparison result. Determine whether. The wireless network connection detection unit 203 receives a detection signal including wireless network identification information output when the wireless communication unit 106 detects a connectable wireless network through the OS 104. The wireless network switching notification unit 204 is connected to the wireless network switching unit 105 and outputs a switching notification signal including the wireless network identification information of the switching destination to the wireless network switching unit 105.

次に、図４を参照しつつ、無線網切替制御装置１０１による無線端末装置１００の無線網の切り替え処理について説明する。まず、無線端末装置１００が、無線通信部１０６を通じて公衆無線網である、無線網Ｂの基地局装置６０１と接続しているとする。ここで、無線端末装置１００が、無線網Ａへの無線通信を提供する無線ＡＰ装置５０１の圏内に入ると、無線通信部１０６が、無線ＡＰ装置５０１からの無線電波を検知する。無線電波を検知すると無線通信部１０６は、無線網Ａを示す無線網識別情報を含む検知信号をＯＳ１０４に出力する。ＯＳ１０４は、無線網Ａへの接続が可能と検知して、当該検知信号を無線網切替制御装置１０１の無線網接続検知部２０３に出力する（ステップＳ１）。無線網接続検知部２０３は、当該検知信号を受けると、ＯＳ１０４を通じて計時部１０７から時刻情報を取得し、取得した時刻情報と、検知信号に含まれる無線網Ａの無線網識別情報を含む推定帯域値の取得要求を推定結果取得部２０１に出力する（ステップＳ２）。   Next, the wireless network switching processing of the wireless terminal device 100 by the wireless network switching control device 101 will be described with reference to FIG. First, it is assumed that the wireless terminal device 100 is connected to the base station device 601 of the wireless network B, which is a public wireless network, through the wireless communication unit 106. Here, when the wireless terminal device 100 enters the area of the wireless AP device 501 that provides wireless communication to the wireless network A, the wireless communication unit 106 detects a wireless radio wave from the wireless AP device 501. When the wireless radio wave is detected, the wireless communication unit 106 outputs a detection signal including wireless network identification information indicating the wireless network A to the OS 104. The OS 104 detects that the connection to the wireless network A is possible and outputs the detection signal to the wireless network connection detection unit 203 of the wireless network switching control device 101 (step S1). Upon receiving the detection signal, the wireless network connection detection unit 203 acquires time information from the time measuring unit 107 through the OS 104, and an estimated band including the acquired time information and the wireless network identification information of the wireless network A included in the detection signal. A value acquisition request is output to the estimation result acquisition unit 201 (step S2).

推定結果取得部２０１は、無線網接続検知部２０３から取得要求を受けた場合、ステップＳ２が処理される直前の帯域推定結果、すなわち、無線網接続検知部２０３から取得要求を受けた時点の直前の推定帯域値を帯域推定結果記憶部１０２から取得する。例えば、無線網接続検知部２０３から受けた取得要求に含まれる時刻情報が２０１４年５月１２日の１０：００：１４であるとする。推定結果取得部２０１が、帯域推定結果記憶部１０２を参照した際に、既に、２０１４年５月１２日の１０：００：１５までの推定帯域値が帯域推定部１０３により書き込まれているとする。この場合、２０１４年５月１２日の１０：００：００に対応する推定帯域値が、取得要求を受けた時点の直前の推定帯域値となるため、推定結果取得部２０１は、「５．６Ｍｂｐｓ」を推定帯域値として読み出す。また、「５．６Ｍｂｐｓ」に対応する無線網識別情報、ここでは、無線網Ｂを示す無線網識別情報を現在接続中の無線網を示す無線網識別情報として読み出す。推定結果取得部２０１は、読み出した推定帯域値を推定結果１とし、推定結果１と、無線網接続検知部２０３から受けた無線網Ａを示す切替先無線網識別情報と、読み出した接続中の無線網Ｂを示す現接続中無線網識別情報とを推定結果比較部２０２に出力する（ステップＳ３）。   When the estimation result acquisition unit 201 receives an acquisition request from the wireless network connection detection unit 203, the estimation result immediately before step S2 is processed, that is, immediately before the time when the acquisition request is received from the wireless network connection detection unit 203. Are obtained from the band estimation result storage unit 102. For example, it is assumed that the time information included in the acquisition request received from the wireless network connection detection unit 203 is 10:00:14 on May 12, 2014. When the estimation result acquisition unit 201 refers to the band estimation result storage unit 102, it is assumed that the band estimation unit 103 has already written the estimated band values up to 10:00:15 on May 12, 2014. . In this case, since the estimated bandwidth value corresponding to 10:00 on May 12, 2014 is the estimated bandwidth value immediately before the acquisition request is received, the estimation result acquisition unit 201 sets “5.6 Mbps”. "Is read out as an estimated band value. Also, the wireless network identification information corresponding to “5.6 Mbps”, here, the wireless network identification information indicating the wireless network B is read as the wireless network identification information indicating the currently connected wireless network. The estimation result acquisition unit 201 sets the read estimated band value as the estimation result 1, the estimation result 1, the switching destination radio network identification information indicating the radio network A received from the radio network connection detection unit 203, and the read connection in progress The currently connected wireless network identification information indicating the wireless network B is output to the estimation result comparison unit 202 (step S3).

推定結果比較部２０２は、推定結果取得部２０１から推定結果１と切替先無線網識別情報と、現接続中無線網識別情報とを受けると、切替先無線網識別情報を読み出す。ここでは、無線網Ａが切替先無線網識別情報として読み出されることになる。推定結果比較部２０２は、読み出した無線網Ａを示す無線網識別情報を無線網切替通知部２０４に出力する（ステップＳ４）。無線網切替通知部２０４は、無線網Ａの無線網識別情報を含む切替通知信号を無線網切替部１０５に出力する。無線網切替部１０５は、切替通知信号を受けると、ＯＳ１０４を通じて無線通信部１０６に無線網識別情報に対応する無線網への切り替えを要求する切替指示信号を出力する（ステップＳ５）。無線通信部１０６は、無線網識別情報を含む切替指示信号を受信すると、無線網識別情報に対応する無線網への切り替えを行う。ここでは、無線網Ｂから無線網Ａへの切り替えが行われ、無線通信部１０６は、無線ＡＰ装置５０１に接続する（ステップＳ６）。   When the estimation result comparison unit 202 receives the estimation result 1, the switching destination wireless network identification information, and the currently connected wireless network identification information from the estimation result acquisition unit 201, the estimation result comparison unit 202 reads the switching destination wireless network identification information. Here, the wireless network A is read as switching destination wireless network identification information. The estimation result comparison unit 202 outputs the wireless network identification information indicating the read wireless network A to the wireless network switching notification unit 204 (step S4). The wireless network switching notification unit 204 outputs a switching notification signal including wireless network identification information of the wireless network A to the wireless network switching unit 105. Upon receiving the switching notification signal, the wireless network switching unit 105 outputs a switching instruction signal for requesting the wireless communication unit 106 to switch to the wireless network corresponding to the wireless network identification information through the OS 104 (step S5). When receiving the switching instruction signal including the wireless network identification information, the wireless communication unit 106 switches to the wireless network corresponding to the wireless network identification information. Here, switching from the wireless network B to the wireless network A is performed, and the wireless communication unit 106 connects to the wireless AP device 501 (step S6).

無線通信部１０６が、無線網Ａに接続すると、無線通信部１０６は、無線網Ａの無線網識別情報を含む接続完了通知をＯＳ１０４に通知する。ＯＳ１０４は、接続完了通知を受けた時点の時刻情報を計時部１０７から取得し、取得した時刻情報と、接続完了通知とを推定結果比較部２０２に出力する。推定結果比較部２０２は、時刻情報と接続完了通知とを受けると、推定結果取得部２０１に、当該時刻情報を含む推定帯域値の取得要求を出力する（ステップＳ７）。   When the wireless communication unit 106 connects to the wireless network A, the wireless communication unit 106 notifies the OS 104 of a connection completion notification including the wireless network identification information of the wireless network A. The OS 104 acquires time information at the time of receiving the connection completion notification from the time measuring unit 107, and outputs the acquired time information and the connection completion notification to the estimation result comparison unit 202. Upon receiving the time information and the connection completion notification, the estimation result comparison unit 202 outputs an estimation band value acquisition request including the time information to the estimation result acquisition unit 201 (step S7).

推定結果取得部２０１は、推定結果比較部２０２から、取得要求を受けた場合、取得要求に含まれる時刻情報が示す時刻の直後の推定帯域値を読み出す。例えば、無線網Ａへの接続切り替えが、２０１４年５月１２日１０：００：１６に行われ、この時刻が取得要求に含まれていたとする。このとき、図２に示すデータでは、直後の推定帯域取得時刻は、２０１４年５月１２日１０：００：３０が該当するため、推定結果取得部２０１は、この時刻に対応する推定帯域値「１０．０Ｍｂｐｓ」を読み出す。推定結果取得部２０１は、読み出した推定帯域値「１０．０Ｍｂｐｓ」を推定結果２として推定結果比較部２０２に出力する（ステップＳ８）。推定結果比較部２０２は、推定結果１と推定結果２を比較する（ステップＳ９）。推定結果比較部２０２は、推定結果１が推定結果２よりも大きい値でない場合、すなわち、推定結果１が推定結果２の値以下の場合、処理を終了する。上記の場合、推定結果１が「５．６Ｍｂｐｓ」であり、推定結果２が「１０．０Ｍｂｐｓ」であるため処理を終了する。   When receiving an acquisition request from the estimation result comparison unit 202, the estimation result acquisition unit 201 reads an estimated band value immediately after the time indicated by the time information included in the acquisition request. For example, it is assumed that connection switching to the wireless network A is performed at 10:00:16 on May 12, 2014, and this time is included in the acquisition request. At this time, in the data shown in FIG. 2, the estimated bandwidth acquisition time immediately after that corresponds to 12:00:30 on May 12, 2014. Therefore, the estimation result acquisition unit 201 uses the estimated bandwidth value “ “10.0 Mbps” is read out. The estimation result acquisition unit 201 outputs the read estimated band value “10.0 Mbps” to the estimation result comparison unit 202 as the estimation result 2 (step S8). The estimation result comparison unit 202 compares the estimation result 1 and the estimation result 2 (step S9). The estimation result comparison unit 202 ends the process when the estimation result 1 is not a value greater than the estimation result 2, that is, when the estimation result 1 is equal to or less than the value of the estimation result 2. In the above case, since the estimation result 1 is “5.6 Mbps” and the estimation result 2 is “10.0 Mbps”, the process ends.

一方、推定結果比較部２０２は、推定結果１と推定結果２を比較し、推定結果１が推定結果２よりも大きい値の場合、以前の無線網へ切り戻す処理を行う。例えば、図２において、「推定帯域取得時刻」が２０１４年５月１３日のデータの例のように、無線網Ｂから無線網Ａへ切り替えた結果、推定結果１が、１２：１５：１５の「７．６Ｍｂｐｓ」として取得され、推定結果２が１２：１５：３０の「１．５Ｍｂｐｓ」として取得された場合、推定結果１が推定結果２よりも大きい値となる。この場合、推定結果比較部２０２は、推定結果１に対応して取得した現接続中無線網識別情報を切り戻し先の無線網を示す無線網識別情報として無線網切替通知部２０４に出力する。ここでは、無線網Ｂの無線網識別情報が出力されることになる（ステップＳ１０）。無線網切替通知部２０４は、無線網識別情報を含む切替通知信号を無線網切替部１０５に出力する。無線網切替部１０５は、切替通知信号を受けると、ＯＳ１０４を通じて無線通信部１０６に無線網識別情報に対応する無線網への切り替えを要求する切替指示信号を出力する（ステップＳ１１）。無線通信部１０６は、切替指示信号に含まれる無線網識別情報に対応する無線網への切り替えを行う。ここでは、無線網Ａから無線網Ｂへの切り戻しが行われ、無線通信部１０６は、基地局装置６０１に接続する（ステップＳ１２）。   On the other hand, the estimation result comparison unit 202 compares the estimation result 1 and the estimation result 2, and performs a process of switching back to the previous wireless network when the estimation result 1 is larger than the estimation result 2. For example, in FIG. 2, as a result of switching from the wireless network B to the wireless network A as in the example of the data of “estimated bandwidth acquisition time” on May 13, 2014, the estimation result 1 is 12:15:15 When acquired as “7.6 Mbps” and the estimation result 2 is acquired as “1.5 Mbps” at 12:15:30, the estimation result 1 is larger than the estimation result 2. In this case, the estimation result comparison unit 202 outputs the currently connected wireless network identification information acquired corresponding to the estimation result 1 to the wireless network switching notification unit 204 as wireless network identification information indicating the switchover destination wireless network. Here, the wireless network identification information of the wireless network B is output (step S10). The wireless network switching notification unit 204 outputs a switching notification signal including wireless network identification information to the wireless network switching unit 105. When receiving the switching notification signal, the wireless network switching unit 105 outputs a switching instruction signal for requesting the wireless communication unit 106 to switch to the wireless network corresponding to the wireless network identification information through the OS 104 (step S11). The wireless communication unit 106 performs switching to a wireless network corresponding to the wireless network identification information included in the switching instruction signal. Here, switching back from the wireless network A to the wireless network B is performed, and the wireless communication unit 106 connects to the base station apparatus 601 (step S12).

上記の第１実施形態の構成により、帯域推定部１０３が、定期的に無線端末装置１００が接続している無線網Ａ、または、無線網Ｂにおける利用可能な帯域値を推定しており、無線網切替制御装置１０１が、新たな無線網に接続する際に、接続を切り替える前後の帯域の推定値を取得し、切り替えた後に、切り替え前よりも帯域の推定値が小さくなった場合、すなわち、以前よりも狭帯域となってしまった場合、元の無線網に切り戻すことが可能となる。これにより、利用者の体感を劣化させないように複数の無線網から適切な無線網を選択して切り替えを行うことが可能となり、例えば、通信速度が低下してダウンロードや画像の表示が遅くなるなどの体感の劣化を感じさせないようにすることが可能となる。   With the configuration of the first embodiment described above, the bandwidth estimation unit 103 periodically estimates the available bandwidth value in the wireless network A or the wireless network B to which the wireless terminal device 100 is connected. When the network switching control device 101 connects to a new wireless network, it acquires the estimated value of the band before and after switching the connection, and after switching, the estimated value of the band becomes smaller than before switching, that is, When the bandwidth becomes narrower than before, it is possible to switch back to the original wireless network. As a result, it is possible to select and switch an appropriate wireless network from a plurality of wireless networks so as not to deteriorate the user's experience. For example, the communication speed decreases and download and image display are delayed. It is possible to prevent the user from feeling the deterioration of the body feeling.

また、上記の第１実施形態の構成により、無線網切替制御装置１０１は、新たに接続可能な無線網が検出された際に、新たな無線網への切り替えを行ってから、帯域の推定値を比較することによって、利用者の体感の劣化が発生していないかを判定する構成となっている。一般的に、実効帯域幅を計測する場合、大容量のファイルをダウンロードし、ダウンロードに要した時間から平均実効帯域幅を算出するという手法が用いられるが、この手法では、実効帯域幅の計測に数秒から十数秒が必要となる。これに対して、上記の第１実施形態では、新たな無線網が検出された場合、切り替えを行ってから計測していることになるため、事前に、切り替え先の無線網の帯域を検出してから切り替える構成に比べて、接続遅延を短くすることが可能となる。   In addition, with the configuration of the first embodiment described above, the wireless network switching control device 101 switches to a new wireless network when a newly connectable wireless network is detected, and then estimates the bandwidth. By comparing these, it is configured to determine whether or not the user experience has deteriorated. In general, when measuring the effective bandwidth, a method of downloading a large file and calculating the average effective bandwidth from the time required for the download is used. In this method, the effective bandwidth is measured. A few seconds to a few dozen seconds are required. In contrast, in the first embodiment, when a new wireless network is detected, measurement is performed after switching, so the bandwidth of the switching destination wireless network is detected in advance. The connection delay can be shortened as compared with the configuration in which the connection is switched later.

なお、上記の第１実施形態において、無線端末装置１００は、複数台あってもよく、また、無線網は、無線網Ａと無線網Ｂの２つに限られず、３つ以上存在していてもよい。
また、上記の第１実施形態の構成において、ステップＳ１、Ｓ６、Ｓ１２の処理は、例えば、スマートフォンなどで標準的に提供されているＯＳ１０４の機能を利用することで実現することができる。また、ステップＳ１２の切り戻しの処理は、キャリア事業者が提供する公衆無線網からＷｉ−Ｆｉ(登録商標)網に切り替えた場合にも、スマートフォンなどで標準的に提供されているＯＳ１０４の機能を利用して、Ｗｉ−Ｆｉ(登録商標)網への接続を切断することで、公衆無線網に再接続することが可能である。この場合、無線網切替通知部２０４は、接続中の無線網Ａの切断の通知を行うことで、無線網Ｂへの切り戻しを行うことが可能となる。 In the first embodiment, there may be a plurality of wireless terminal devices 100, and the wireless network is not limited to the wireless network A and the wireless network B, and there are three or more wireless terminals. Also good.
In the configuration of the first embodiment described above, the processes in steps S1, S6, and S12 can be realized by using the function of the OS 104 that is provided as a standard on a smartphone, for example. Further, the switch-back processing in step S12 is performed by the function of the OS 104 that is provided as a standard on a smartphone or the like even when the public wireless network provided by the carrier is switched to the Wi-Fi (registered trademark) network. It is possible to reconnect to the public wireless network by disconnecting the connection to the Wi-Fi (registered trademark) network. In this case, the wireless network switching notification unit 204 can switch back to the wireless network B by notifying disconnection of the currently connected wireless network A.

また、上記の第１実施形態において、図２では、帯域推定部１０３による推定が１５秒ごとに行われている例を示しているが、この間隔は、一例であり、この間隔より、短い間隔でも長い間隔でもよく、また、切り替えが行われた際には、切り替え直後に推定を開始し、その時点を起点として改めて定期的に推定するようにしてもよい。このようにすることで、切り戻しを行うか否かの判定を行う時間を短くすることが可能となる。
また、上記の第１実施形態では、無線網切替制御装置１０１の推定結果比較部２０２が、帯域推定部１０３が定期的に計測する推定帯域値に基づいて、利用者の体感が劣化するか否かを判定している。しかし、本発明は、当該実施の形態の構成に限られず、推定帯域値以外の指標によって判定してもよく、電波状況、通信コスト、帯域幅、実効帯域幅、アプリケーション又はデータの種類などであってもよく、これらの幾つかを組み合わせて判定するようにしてもよい。 In the first embodiment, FIG. 2 shows an example in which the estimation by the band estimation unit 103 is performed every 15 seconds, but this interval is an example, and is shorter than this interval. However, the interval may be long, and when switching is performed, estimation may be started immediately after switching, and periodically estimated again from that point of time. By doing in this way, it is possible to shorten the time for determining whether or not to perform switching back.
Moreover, in said 1st Embodiment, the estimation result comparison part 202 of the radio network switching control apparatus 101 determines whether a user's sensation deteriorates based on the estimated band value which the band estimation part 103 measures regularly. Judging. However, the present invention is not limited to the configuration of the embodiment, and may be determined by an index other than the estimated bandwidth value, such as radio wave status, communication cost, bandwidth, effective bandwidth, application or data type. Alternatively, some of these may be combined for determination.

また、上記の第１実施形態では、無線網切替制御装置１０１の推定結果比較部２０２が、帯域推定部１０３が定期的に計測する推定帯域値について、無線網を切り替えた後の推定帯域値が、無線網を切り替える前の推定帯域値よりも、小さくなった場合に、体感が劣化するものとして切り戻すようにしている。しかし、本発明は、当該実施の形態の構成に限られず、無線網を切り替えた後の推定帯域値が、無線網を切り替える前の推定帯域値以下の場合にも切り戻すようにしてもよい。また、例えば、切り替えた後の推定帯域値が、切り替え前の推定帯域値から予め定められる変化の割合を超えない場合には、切り戻しを行わず、超えた場合に切り戻すようにしてもよい。これにより、切り替えの回数を減らすことができ、また、少し体感が劣化したとしても通信コストの低い無線網などを選択するといったことも可能となる。   Moreover, in said 1st Embodiment, the estimation band comparison part 202 of the radio network switching control apparatus 101 uses the estimated band value after switching a radio network about the estimated band value which the band estimation part 103 measures regularly. When it becomes smaller than the estimated bandwidth value before switching the wireless network, it is switched back to the case where the sensation is deteriorated. However, the present invention is not limited to the configuration of the embodiment, and may be switched back when the estimated bandwidth value after switching the wireless network is equal to or less than the estimated bandwidth value before switching the wireless network. In addition, for example, when the estimated band value after switching does not exceed a predetermined rate of change from the estimated band value before switching, switching is not performed, and switching is performed when it exceeds. . As a result, the number of times of switching can be reduced, and it is possible to select a wireless network with a low communication cost even if the experience is slightly deteriorated.

（第２実施形態）
図５は、本発明の第２実施形態による無線通信システム２の構成を示す概略ブロック図である。第１実施形態と同一の構成については、同一の符号を付し、以下、異なる構成について説明する。第２実施形態による無線通信システム２は、無線端末装置１００ａと、サーバ装置３００とを備える。無線端末装置１００ａは、帯域推定部１０３ａ、ＯＳ１０４、無線網切替部１０５、無線通信部１０６と、計時部１０７、切替送受信部１０８とを備える。サーバ装置３００は、無線網切替制御装置１０１、帯域推定結果記憶部３０２、ＯＳ３０４、通信部３０６、計時部３０７、切替送受信部３０８を備える。 (Second Embodiment)
FIG. 5 is a schematic block diagram showing the configuration of the wireless communication system 2 according to the second embodiment of the present invention. The same configurations as those in the first embodiment are denoted by the same reference numerals, and different configurations will be described below. The wireless communication system 2 according to the second embodiment includes a wireless terminal device 100a and a server device 300. The wireless terminal device 100a includes a bandwidth estimation unit 103a, an OS 104, a wireless network switching unit 105, a wireless communication unit 106, a timer unit 107, and a switching transmission / reception unit 108. The server device 300 includes a wireless network switching control device 101, a band estimation result storage unit 302, an OS 304, a communication unit 306, a time measuring unit 307, and a switching transmission / reception unit 308.

無線端末装置１００ａの帯域推定部１０３ａは、帯域推定部１０３と同じく、例えば、特開２０１１−１４２６２２号公報などの参考文献に示される手法により定期的に無線端末装置１００ａが利用可能な帯域値を推定する。また、帯域推定部１０３ａは、帯域値の推定を行う際に、ＯＳ１０４を通じて無線通信部１０６から現在接続中、すなわち推定対象の無線網を示す無線網識別情報を取得する。また、帯域推定部１０３ａは、推定を行う際の年月日と時刻を示す時刻情報をＯＳ１０４を通じて計時部１０７から取得する。また、帯域推定部１０３ａは、推定対象の無線網識別情報と、推定を行った際の時刻情報と、推定した帯域値とを対応付けてＯＳ１０４、無線通信部１０６を通じてサーバ装置３００に送信し、サーバ装置３００の帯域推定結果記憶部３０２の無線端末装置１００ａに割り当てられている領域に図２と同様の形式でデータを書き込む。   Similarly to the bandwidth estimation unit 103, the bandwidth estimation unit 103a of the wireless terminal device 100a determines a bandwidth value that can be periodically used by the wireless terminal device 100a by a technique disclosed in a reference such as Japanese Patent Application Laid-Open No. 2011-142622. presume. In addition, when estimating the bandwidth value, the bandwidth estimation unit 103a acquires wireless network identification information indicating the wireless network that is currently connected, that is, the estimation target wireless network from the wireless communication unit 106 through the OS 104. Further, the bandwidth estimation unit 103 a acquires time information indicating the date and time when estimation is performed from the time measuring unit 107 through the OS 104. Further, the bandwidth estimation unit 103a associates the wireless network identification information to be estimated, the time information at the time of estimation, and the estimated bandwidth value, and transmits them to the server device 300 through the OS 104 and the wireless communication unit 106. Data is written in an area allocated to the wireless terminal device 100a in the bandwidth estimation result storage unit 302 of the server device 300 in the same format as in FIG.

無線端末装置１００ａの切替送受信部１０８は、ＯＳ１０４と無線通信部１０６を通じてサーバ装置３００の切替送受信部１０８と情報の送受信を行う。サーバ装置３００の切替送受信部３０８は、ＯＳ３０４と通信部３０６を通じて無線端末装置１００ａの切替送受信部１０８と情報の送受信を行う。すなわち、切替送受信部１０８と切替送受信部３０８とによって、無線端末装置１００ａの内部の機能部とサーバ装置３００の内部の機能部が接続された状態となっている。これは、第１実施形態における無線網切替制御装置１０１、帯域推定結果記憶部１０２が、サーバ装置３００において、それぞれ無線網切替制御装置１０１、帯域推定結果記憶部３０２として備えられている状態ともいえる。   The switching transmission / reception unit 108 of the wireless terminal device 100 a transmits / receives information to / from the switching transmission / reception unit 108 of the server device 300 through the OS 104 and the wireless communication unit 106. The switching transmission / reception unit 308 of the server device 300 transmits / receives information to / from the switching transmission / reception unit 108 of the wireless terminal device 100 a through the OS 304 and the communication unit 306. In other words, the switching transmission / reception unit 108 and the switching transmission / reception unit 308 connect the functional unit inside the wireless terminal device 100 a and the functional unit inside the server device 300. This can be said to be a state in which the wireless network switching control device 101 and the bandwidth estimation result storage unit 102 in the first embodiment are provided as the wireless network switching control device 101 and the bandwidth estimation result storage unit 302 in the server device 300, respectively. .

サーバ装置３００の通信部３０６は、各無線網と常に接続しており、この接続は、無線であっても有線であってもよい。計時部３０７は、計時部１０７と同じく要求を受けて、現在の年月日と時刻を示す時刻情報を出力する。なお、無線網切替制御装置１０１の各機能部における時刻情報の取得の処理については、計時部１０７と、計時部３０７は、常に時刻の同期が取られており、どちらの時刻情報を取得するようにしてもよい。通信の遅延を考慮するのであれば、サーバ装置３００の計時部３０７から時刻情報を取得してもよいし、遅延が大きくなければ、無線端末装置１００ａの計時部１０７から時刻情報を取得してもよい。また、帯域推定部１０３ａが、無線端末装置１００ａの計時部１０７から時刻情報を取得して、推定した推定帯域値と取得した時刻情報を対応付けてサーバ装置３００に送信するようにしているが、本発明の構成は、当該実施の形態に限られず、帯域推定部１０３ａが、推定帯域値をサーバ装置３００に送信し、サーバ装置３００のＯＳ３０４が、推定帯域値を帯域推定結果記憶部３０２に書き込む際に計時部３０７から時刻情報を取得し、対応付けて書き込むようにしてもよい。   The communication unit 306 of the server device 300 is always connected to each wireless network, and this connection may be wireless or wired. The time measuring unit 307 receives the request in the same manner as the time measuring unit 107 and outputs time information indicating the current date and time. Regarding the time information acquisition processing in each functional unit of the wireless network switching control device 101, the time measuring unit 107 and the time measuring unit 307 are always synchronized in time, and which time information is acquired. It may be. If communication delay is taken into account, time information may be acquired from the time measuring unit 307 of the server device 300, and if the delay is not large, time information may be acquired from the time measuring unit 107 of the wireless terminal device 100a. Good. In addition, the bandwidth estimation unit 103a acquires time information from the time measuring unit 107 of the wireless terminal device 100a, and transmits the estimated estimated bandwidth value and the acquired time information in association with each other to the server device 300. The configuration of the present invention is not limited to the embodiment, and the bandwidth estimation unit 103a transmits the estimated bandwidth value to the server device 300, and the OS 304 of the server device 300 writes the estimated bandwidth value in the bandwidth estimation result storage unit 302. At this time, the time information may be acquired from the time measuring unit 307 and written in association therewith.

第２実施形態における処理は、前述したように、第１実施形態における無線網切替制御装置１０１、帯域推定結果記憶部１０２が、サーバ装置３００において、それぞれ無線網切替制御装置１０１、帯域推定結果記憶部３０２として備えられている以外は、無線端末装置１００ａに無線網切替制御装置１０１が備えられているような処理が行われるため、図４において、無線網切替制御装置１０１及び帯域推定結果記憶部３０２に関する処理がサーバ装置３００において行われ、それ以外の処理は無線端末装置１００ａにおいて行われることになる。   As described above, in the processing in the second embodiment, the wireless network switching control device 101 and the bandwidth estimation result storage unit 102 in the first embodiment are respectively connected to the wireless network switching control device 101 and the bandwidth estimation result storage in the server device 300. Except for being provided as the unit 302, since processing is performed as if the wireless terminal device 100a includes the wireless network switching control device 101, the wireless network switching control device 101 and the band estimation result storage unit in FIG. Processing relating to 302 is performed in the server device 300, and other processing is performed in the wireless terminal device 100a.

上記の第２実施形態の構成により、第１実施形態で得られる効果に加えて、無線網切替制御装置１０１をサーバ装置３００に備えたことにより、無線端末装置１００ａが複数存在していた場合、これらの複数の無線端末装置１００ａで無線網切替制御装置１０１を共有して利用することが可能となる。そのため、無線網切替制御装置１０１で実現している複数無線網から適切な無線網を選択する方式を変更する場合に、サーバ装置３００の無線網切替制御装置１０１の方式のみを変更するだけで全ての無線端末装置１００ａの選択方式を変更することができ、方式変更に伴うコストを抑制できるという効果がある。複数の無線端末装置１００ａが共有する場合、無線網切替制御装置１０１が、どの無線端末装置１００ａを対象として処理を行っているかを特定できるようにするため、各無線端末装置１００ａに予め付与される無線端末装置識別情報が、無線網切替制御装置１０１内で送受信、または、処理されるデータに常に含まれることになる。   With the configuration of the second embodiment described above, in addition to the effects obtained in the first embodiment, when the server device 300 includes the wireless network switching control device 101, when there are a plurality of wireless terminal devices 100a, The wireless network switching control device 101 can be shared and used by the plurality of wireless terminal devices 100a. Therefore, when the method for selecting an appropriate wireless network from a plurality of wireless networks realized by the wireless network switching control device 101 is changed, only the method of the wireless network switching control device 101 of the server device 300 is changed. The selection method of the wireless terminal device 100a can be changed, and the cost associated with the method change can be suppressed. When a plurality of wireless terminal devices 100a are shared, the wireless network switching control device 101 is given in advance to each wireless terminal device 100a in order to be able to specify which wireless terminal device 100a is being processed. The wireless terminal device identification information is always included in data that is transmitted / received or processed in the wireless network switching control device 101.

なお、上記の第２実施形態の構成において、帯域推定部１０３ａを無線端末装置１００ａ側に備えるのではなく、サーバ装置３００側に備え、上記の第２実施形態の構成とは逆に、無線端末装置１００ａ側からサーバ装置３００側への通信の帯域を推定し、推定した推定帯域値を帯域推定結果記憶部３０２に記憶させるようにしてもよい。   In the configuration of the second embodiment, the bandwidth estimation unit 103a is not provided on the wireless terminal device 100a side, but on the server device 300 side. In contrast to the configuration of the second embodiment, the wireless terminal The bandwidth of communication from the device 100a side to the server device 300 side may be estimated, and the estimated bandwidth value estimated may be stored in the bandwidth estimation result storage unit 302.

上述した実施形態における無線網切替制御装置１０１をコンピュータで実現するようにしてもよい。その場合、この機能を実現するためのプログラムをコンピュータ読み取り可能な記録媒体に記録して、この記録媒体に記録されたプログラムをコンピュータシステムに読み込ませ、実行することによって実現してもよい。なお、ここでいう「コンピュータシステム」とは、ＯＳや周辺機器等のハードウェアを含むものとする。また、「コンピュータ読み取り可能な記録媒体」とは、フレキシブルディスク、光磁気ディスク、ＲＯＭ、ＣＤ−ＲＯＭ等の可搬媒体、コンピュータシステムに内蔵されるハードディスク等の記憶装置のことをいう。さらに「コンピュータ読み取り可能な記録媒体」とは、インターネット等のネットワークや電話回線等の通信回線を介してプログラムを送信する場合の通信線のように、短時間の間、動的にプログラムを保持するもの、その場合のサーバやクライアントとなるコンピュータシステム内部の揮発性メモリのように、一定時間プログラムを保持しているものも含んでもよい。また上記プログラムは、前述した機能の一部を実現するためのものであってもよく、さらに前述した機能をコンピュータシステムにすでに記録されているプログラムとの組み合わせで実現できるものであってもよく、ＦＰＧＡ（Field Programmable Gate Array）等のプログラマブルロジックデバイスを用いて実現されるものであってもよい。   The wireless network switching control device 101 in the embodiment described above may be realized by a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program held for a certain period of time. Further, the program may be a program for realizing a part of the above-described functions, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system. You may implement | achieve using programmable logic devices, such as FPGA (Field Programmable Gate Array).

以上、この発明の実施形態について図面を参照して詳述してきたが、具体的な構成はこの実施形態に限られるものではなく、この発明の要旨を逸脱しない範囲の設計等も含まれる。   The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

１ 無線通信システム
１００ 無線端末装置
１０１ 無線網切替制御装置
１０２ 帯域推定結果記憶部
１０３ 帯域推定部
１０４ ＯＳ
１０５ 無線網切替部
１０６ 無線通信部
１０７ 計時部
５０１ 無線ＡＰ装置
６０１ 基地局装置 1 wireless communication system 100 wireless terminal device 101 wireless network switching control device 102 band estimation result storage unit 103 band estimation unit 104 OS
105 Wireless network switching unit 106 Wireless communication unit 107 Timekeeping unit 501 Wireless AP device 601 Base station device

Claims (9)

接続可能な無線網を検知する無線網接続検知部と、
第１の無線網の接続中に、前記無線網接続検知部が第２の無線網を検知した場合、前記第２の無線網への切り替え前後に、定期的に推定されている接続中の無線網の推定帯域値を取得する推定結果取得部と、
前記推定結果取得部が取得する切り替え前後の無線網の推定帯域値を比較する推定結果比較部と、
前記第２の無線網への切り替えが行われた後に、前記推定結果比較部が比較した結果に基づいて、前記第２の無線網への接続の維持、または、前記第１の無線網への切り戻しをさせる無線網切替通知部と、
を備えることを特徴とする無線網切替制御装置。 A wireless network connection detection unit for detecting a connectable wireless network;
When the wireless network connection detection unit detects the second wireless network during connection of the first wireless network, the wireless connection currently estimated periodically before and after switching to the second wireless network An estimation result acquisition unit for acquiring an estimated bandwidth value of the network;
An estimation result comparison unit that compares the estimated bandwidth value of the wireless network before and after switching acquired by the estimation result acquisition unit;
After switching to the second wireless network, based on the result of the comparison by the estimation result comparison unit, the connection to the second wireless network is maintained or the connection to the first wireless network is performed. A wireless network switching notification unit for switching back,
A wireless network switching control device comprising: 前記推定結果比較部は、
切り替え前の無線網の推定帯域値が、切り替え後の無線網の推定帯域値より大きい場合、前記第１の無線網への切り戻しをさせる判定を行い、前記切り替え前の無線網の推定帯域値が、前記切り替え後の無線網の推定帯域値以下の場合、前記第２の無線網への接続を維持するため、前記第１の無線網への切り戻しをさせない判定を行う
ことを特徴とする請求項１に記載の無線網切替制御装置。 The estimation result comparison unit
When the estimated bandwidth value of the wireless network before switching is larger than the estimated bandwidth value of the wireless network after switching, it is determined to switch back to the first wireless network, and the estimated bandwidth value of the wireless network before switching However, if the bandwidth is less than or equal to the estimated bandwidth value of the wireless network after switching, a determination is made not to switch back to the first wireless network in order to maintain a connection to the second wireless network. The wireless network switching control device according to claim 1. 前記推定結果比較部は、
切り替え前の無線網の推定帯域値と、切り替え後の無線網の推定帯域値とにおける変化の割合に応じて、前記第２の無線網への接続を維持させるか、前記第１の無線網へ切り戻しさせるかを判定する
ことを特徴とする請求項１に記載の無線網切替制御装置。 The estimation result comparison unit
Depending on the rate of change in the estimated bandwidth value of the wireless network before switching and the estimated bandwidth value of the wireless network after switching, the connection to the second wireless network is maintained or the first wireless network is reached. The wireless network switching control device according to claim 1, wherein whether to switch back is determined. 前記無線網切替通知部は、前記第２の無線網を切断する通知を行うことによって、前記第１の無線網への切り戻しをさせる
ことを特徴とする請求項１から３のいずれか１つに記載の無線網切替制御装置。 The wireless network switching notification unit makes a switch back to the first wireless network by performing a notification of disconnecting the second wireless network. 4. A wireless network switching control device according to claim 1. 無線網と接続し、新たに無線網を検出した場合に通知を行う無線通信部と、
前記無線通信部が接続している無線網の帯域値を定期的に推定し、推定を行った時刻を示す時刻情報を計時手段から取得し、推定帯域値と時刻情報とを対応付けて出力する帯域推定部と、
前記帯域推定部が出力する前記推定帯域値と、前記時刻情報とを対応付けて記憶する帯域推定結果記憶部と、
前記無線通信部が検出した接続可能な新たな無線網を検知する無線網接続検知部と、
前記無線通信部が第１の無線網の接続中に、前記無線網接続検知部が第２の無線網を検知した場合、前記第２の無線網への切り替え前後に、前記帯域推定結果記憶部から接続中の無線網の推定帯域値を取得する推定結果取得部と、
前記推定結果取得部が取得する切り替え前後の無線網の推定帯域値を比較する推定結果比較部と、
前記第２の無線網への切り替えを通知した後に、前記推定結果比較部が比較した結果に基づいて、前記第１の無線網へ切り戻しの通知を行う無線網切替通知部と、
前記無線網切替通知部が通知する無線網へ前記無線通信部の接続を切り替えさせる無線網切替部と、
を備えることを特徴とする無線端末装置。 A wireless communication unit that connects to a wireless network and notifies when a new wireless network is detected;
Periodically estimates the bandwidth value of the wireless network to which the wireless communication unit is connected, acquires time information indicating the time of estimation from the time measuring means, and outputs the estimated bandwidth value and time information in association with each other. A bandwidth estimation unit;
A band estimation result storage unit that stores the estimated band value output by the band estimation unit and the time information in association with each other;
A wireless network connection detection unit for detecting a new connectable wireless network detected by the wireless communication unit;
If the wireless network connection detection unit detects the second wireless network while the wireless communication unit is connected to the first wireless network, the bandwidth estimation result storage unit is before and after switching to the second wireless network. An estimation result acquisition unit for acquiring an estimated bandwidth value of a connected wireless network from,
An estimation result comparison unit that compares the estimated bandwidth value of the wireless network before and after switching acquired by the estimation result acquisition unit;
A wireless network switching notification unit for notifying the first wireless network of switching back based on a result of comparison by the estimation result comparison unit after notifying the switching to the second wireless network;
A wireless network switching unit that switches connection of the wireless communication unit to a wireless network notified by the wireless network switching notification unit;
A wireless terminal device comprising: 切り替えに関する情報の送受信を行う端末側切替送受信部と、
無線網と接続し、新たに無線網を検出した場合に前記端末側切替送受信部を通じて通知を行う無線通信部と、
前記無線通信部が接続している無線網の帯域値を定期的に推定し、推定帯域値を送信する帯域推定部と、
前記端末側切替送受信部が通知する無線網へ前記無線通信部の接続を切り替えさせる無線網切替部と、を備える無線端末装置の無線網の切り替えを行わせるサーバ装置であって、
切り替えに関する情報の送受信を行うサーバ側切替送受信部と、
前記帯域推定部が送信する前記推定帯域値と、計時手段から取得する推定が行われた際の時刻情報とを対応付けて記憶する帯域推定結果記憶部と、
前記サーバ側切替送受信部を通じて前記無線通信部から受信する前記無線通信部が検出した接続可能な新たな無線網を検知する無線網接続検知部と、
前記無線通信部が第１の無線網の接続中に、前記無線網接続検知部が第２の無線網を検知した場合、前記第２の無線網への切り替え前後に、前記帯域推定結果記憶部から接続中の無線網の推定帯域値を取得する推定結果取得部と、
前記推定結果取得部が取得する切り替え前後の無線網の推定帯域値を比較する推定結果比較部と、
前記サーバ側切替送受信部を通じて前記無線網切替部に前記第２の無線網への切り替えを通知した後に、前記推定結果比較部が比較した結果に基づいて、前記第１の無線網へ切り戻しの通知を前記サーバ側切替送受信部を通じて前記無線網切替部に行う無線網切替通知部と、
を備えることを特徴とするサーバ装置。 A terminal-side switching transmission / reception unit for transmitting / receiving information related to switching;
A wireless communication unit that connects to a wireless network and performs notification through the terminal-side switching transmission / reception unit when a new wireless network is detected;
A bandwidth estimation unit that periodically estimates a bandwidth value of a wireless network to which the wireless communication unit is connected, and transmits an estimated bandwidth value;
A wireless network switching unit that switches a connection of the wireless communication unit to a wireless network notified by the terminal-side switching transmission / reception unit, and a server device that switches a wireless network of a wireless terminal device,
A server-side switching transmission / reception unit for transmitting / receiving information related to switching;
A band estimation result storage unit that associates and stores the estimated band value transmitted by the band estimation unit and time information at the time of estimation obtained from the time measuring unit;
A wireless network connection detection unit for detecting a new connectable wireless network detected by the wireless communication unit received from the wireless communication unit through the server-side switching transmission / reception unit;
If the wireless network connection detection unit detects the second wireless network while the wireless communication unit is connected to the first wireless network, the bandwidth estimation result storage unit is before and after switching to the second wireless network. An estimation result acquisition unit for acquiring an estimated bandwidth value of a connected wireless network from,
An estimation result comparison unit that compares the estimated bandwidth value of the wireless network before and after switching acquired by the estimation result acquisition unit;
After notifying the switching to the second wireless network to the wireless network switching unit through the server-side switching transmission / reception unit, based on the result of comparison by the estimation result comparison unit, switching back to the first wireless network is performed. A wireless network switching notification unit for performing notification to the wireless network switching unit through the server-side switching transmission / reception unit;
A server device comprising: 無線端末装置と、サーバ装置を備える無線通信システムであって、
前記無線端末装置は、
切り替えに関する情報の送受信を行う端末側切替送受信部と、
無線網と接続し、新たに無線網を検出した場合に前記端末側切替送受信部を通じて通知を行う無線通信部と、
前記無線通信部が接続している無線網の帯域値を定期的に推定し、推定帯域値を送信する帯域推定部と、
前記端末側切替送受信部が通知する無線網へ前記無線通信部の接続を切り替えさせる無線網切替部と、を有し、
前記サーバ装置は、
切り替えに関する情報の送受信を行うサーバ側切替送受信部と、
前記帯域推定部が送信する前記推定帯域値と、計時手段から取得する推定が行われた際の時刻情報とを対応付けて記憶する帯域推定結果記憶部と、
前記サーバ側切替送受信部を通じて前記無線通信部から受信する前記無線通信部が検出した接続可能な新たな無線網を検知する無線網接続検知部と、
前記無線通信部が第１の無線網の接続中に、前記無線網接続検知部が第２の無線網を検知した場合、前記第２の無線網への切り替え前後に、前記帯域推定結果記憶部から接続中の無線網の推定帯域値を取得する推定結果取得部と、
前記推定結果取得部が取得する切り替え前後の無線網の推定帯域値を比較する推定結果比較部と、
前記サーバ側切替送受信部を通じて前記無線網切替部に前記第２の無線網への切り替えを通知した後に、前記推定結果比較部が比較した結果に基づいて、前記第１の無線網へ切り戻しの通知を前記サーバ側切替送受信部を通じて前記無線網切替部に行う無線網切替通知部と、有する
ことを特徴とする無線通信システム。 A wireless communication system including a wireless terminal device and a server device,
The wireless terminal device
A terminal-side switching transmission / reception unit for transmitting / receiving information related to switching;
A wireless communication unit that connects to a wireless network and performs notification through the terminal-side switching transmission / reception unit when a new wireless network is detected;
A bandwidth estimation unit that periodically estimates a bandwidth value of a wireless network to which the wireless communication unit is connected, and transmits an estimated bandwidth value;
A wireless network switching unit that switches the connection of the wireless communication unit to the wireless network notified by the terminal-side switching transmission / reception unit,
The server device
A server-side switching transmission / reception unit for transmitting / receiving information related to switching;
A band estimation result storage unit that associates and stores the estimated band value transmitted by the band estimation unit and time information at the time of estimation obtained from the time measuring unit;
A wireless network connection detection unit for detecting a new connectable wireless network detected by the wireless communication unit received from the wireless communication unit through the server-side switching transmission / reception unit;
If the wireless network connection detection unit detects the second wireless network while the wireless communication unit is connected to the first wireless network, the bandwidth estimation result storage unit is before and after switching to the second wireless network. An estimation result acquisition unit for acquiring an estimated bandwidth value of a connected wireless network from,
An estimation result comparison unit that compares the estimated bandwidth value of the wireless network before and after switching acquired by the estimation result acquisition unit;
After notifying the switching to the second wireless network to the wireless network switching unit through the server-side switching transmission / reception unit, based on the result of comparison by the estimation result comparison unit, switching back to the first wireless network is performed. A wireless communication system comprising: a wireless network switching notification unit that performs notification to the wireless network switching unit through the server-side switching transmission / reception unit. 第１の無線網の接続中に、接続可能な第２の無線網を検知した場合、前記第２の無線網への切り替え前後に、定期的に予め推定されている接続中の無線網の推定帯域値を取得し、
取得した切り替え前後の無線網の推定帯域値を比較し、
前記第２の無線網への切り替えが行われた後に、比較した結果に基づいて、前記第２の無線網への接続の維持、または、前記第１の無線網への切り戻しをさせる
ことを特徴とする無線網切替制御方法。 When a connectable second wireless network is detected during connection of the first wireless network, estimation of the currently connected wireless network is periodically estimated before and after switching to the second wireless network. Get the bandwidth value,
Compare the estimated bandwidth values of the wireless network before and after switching,
After switching to the second wireless network, based on the comparison result, maintaining the connection to the second wireless network or switching back to the first wireless network. A wireless network switching control method. コンピュータに、
第１の無線網の接続中に、接続可能な第２の無線網を検知した場合、前記第２の無線網への切り替え前後に、定期的に予め推定されている接続中の無線網の推定帯域値を取得する手順、
取得した切り替え前後の無線網の推定帯域値を比較する手順、
前記第２の無線網への切り替えが行われた後に、比較した結果に基づいて、前記第２の無線網への接続の維持、または、前記第１の無線網への切り戻しをさせる手順、
を実行させるためのプログラム。 On the computer,
When a connectable second wireless network is detected during connection of the first wireless network, estimation of the currently connected wireless network is periodically estimated before and after switching to the second wireless network. The procedure to get the bandwidth value,
Procedure to compare the estimated bandwidth value of the wireless network before and after switching,
A procedure for maintaining a connection to the second wireless network or switching back to the first wireless network based on a comparison result after switching to the second wireless network;
A program for running
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