JP2020167498A

JP2020167498A - Public radio communication area extension system, mobile radio terminal, and public radio communication area extension program

Info

Publication number: JP2020167498A
Application number: JP2019065476A
Authority: JP
Inventors: 駿介高橋; Shunsuke Takahashi
Original assignee: NEC Platforms Ltd
Current assignee: NEC Platforms Ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2020-10-08
Anticipated expiration: 2039-03-29
Also published as: JP2023123866A; JP7319009B2

Abstract

To provide a public radio communication area extension system for expanding a communication area without increasing the number of radio facilities.SOLUTION: A public radio communication area extension system includes: a public radio terminal 11 that as a radio terminal operated by a business worker performing public business, performs radio connection with a public radio communication network 10 uniquely installed for the public business, and a carrier radio terminal 21 that performs radio connection with a carrier radio communication network 20 for performing a carrier radio communication service; local connection means, e.g., Wi-Fi communication control units 11b, 21b for locally connecting the public radio terminal 11 and the carrier radio terminal 21 with each other; a communication network selection function that as a control application 11c or 21c in either one of the public radio terminal 11 and the carrier radio terminal 21, selects a communication network to be used depending on situations of reception fields from both communication networks before performing radio connection; and a communication function that is provided in a control desk 30 operated by a commander and communicates with each of both communication networks.SELECTED DRAWING: Figure 2

Description

本発明は、公共用無線通信エリア拡張システム、移動無線端末および公共用無線通信エリア拡張プログラムに関し、特に、公共用業務を行うために使用する無線通信において、無線設備の数を安易に増やすことなく、無線通信エリアの拡大を図ることを可能にする公共用無線通信エリア拡張システム、移動無線端末および公共用無線通信エリア拡張プログラムに関する。 The present invention relates to public wireless communication area expansion systems, mobile wireless terminals and public wireless communication area expansion programs, and in particular, in wireless communication used for performing public business, without easily increasing the number of wireless facilities. , Related to public wireless communication area expansion systems, mobile wireless terminals and public wireless communication area expansion programs that enable expansion of wireless communication areas.

消防、防災、交通や防衛などのパブリックセーフティ(公共安全)の分野においては、例えば、特許文献１の特開２０１３−４８３２３号公報「無線通信システム」等にも記載されているように、各公共団体が独自に自営インフラ用の無線設備を公共用無線通信網として設備化して運用している。しかし、設置することができる無線設備数(基地局／中継局)には、設置場所やコスト等の関係から限りがあり、公共用無線通信網としての通信エリア（例えば、通話可能エリア）も制限されてしまっている。 In the field of public safety (public safety) such as firefighting, disaster prevention, traffic and defense, for example, as described in Japanese Patent Application Laid-Open No. 2013-48323 "Wireless Communication System" of Patent Document 1, each public The organization independently installs and operates wireless equipment for self-employed infrastructure as a public wireless communication network. However, the number of wireless facilities (base stations / relay stations) that can be installed is limited due to the installation location and cost, and the communication area as a public wireless communication network (for example, the area where calls can be made) is also limited. It has been done.

このため、実際の現場で公共用の業務を行う業務従事者が使用する公共用無線端末が、通信エリアの状況如何によっては、通信圏外になってしまうために、通信不可（例えば通話不可）となる事態が発生してしまい、緊急時に対処することができない場合も生じてしまう。 For this reason, the public wireless terminal used by a business worker who carries out public work at the actual site may be out of the communication range depending on the situation of the communication area, so that communication is not possible (for example, call is not possible). In some cases, it may not be possible to deal with an emergency.

特開２０１３−４８３２３号公報Japanese Unexamined Patent Publication No. 2013-48323

前述したように、消防、防災、交通や防衛などの公共団体が独自に運営する公共用無線通信網においては、実際の現場で公共用の業務を行う業務従事者が使用する公共用無線端末が、通信エリアの状況如何によっては、通信不可（例えば通話不可）となる事態が発生してしまう場合が生じてしまう。 As mentioned above, in the public wireless communication network independently operated by public organizations such as firefighting, disaster prevention, transportation and defense, public wireless terminals used by business workers who perform public operations at actual sites are used. Depending on the situation of the communication area, a situation may occur in which communication is not possible (for example, communication is not possible).

かかる事態を回避し、常に、公共用業務のための無線通信を可能にするためには、公共用無線通信網としての無線設備（基地局や中継局）の数を安易に増やすことなく、通信エリア（例えば通話が可能なエリア）を拡大することを可能にする何らかの対応策が必要であり、現状の技術には解決するべき課題がある。 In order to avoid such a situation and always enable wireless communication for public business, communication without easily increasing the number of radio equipment (base stations and relay stations) as a public wireless communication network. Some measures are needed to make it possible to expand the area (for example, the area where calls are possible), and the current technology has problems to be solved.

（本開発の目的）
本開発の目的は、かかる課題に鑑み、無線設備の数を安易に増やすことなく、公共用業務を行うために使用する無線通信に関する無線通信エリアの拡大を図ることを可能にする公共用無線通信エリア拡張システム、移動無線端末および公共用無線通信エリア拡張プログラムの提供にある。 (Purpose of this development)
In view of these issues, the purpose of this development is to expand the wireless communication area for wireless communication used for conducting public business without easily increasing the number of wireless facilities. It is in the provision of area expansion systems, mobile wireless terminals and public wireless communication area expansion programs.

前述の課題を解決するため、本発明による公共用無線通信エリア拡張システム、移動無線端末および公共用無線通信エリア拡張プログラムは、主に、次のような特徴的な構成を採用している。 In order to solve the above-mentioned problems, the public wireless communication area expansion system, the mobile wireless terminal, and the public wireless communication area expansion program according to the present invention mainly adopt the following characteristic configurations.

（１）本発明による公共用無線通信エリア拡張システムは、
公共用業務を行うための無線通信エリアを拡張する公共用無線通信エリア拡張システムであって、
前記公共用業務を行う業務従事者が操作する無線端末として、当該公共用業務のために独自に設置した公共用無線通信網と無線接続する公共用無線端末と、公衆用の無線通信サービスを行う公衆用無線通信網と無線接続する公衆用無線端末と、の２つの無線端末を有し、
かつ、前記公共用無線端末および前記公衆用無線端末の双方に、
該公共用無線端末と該公衆用無線端末との間をローカルに接続するローカル接続手段を有し、
かつ、前記公共用無線端末または前記公衆用無線端末のいずれか一方に、
前記公共用無線通信網および前記公衆用無線通信網の双方の通信網から受信する受信電界の状況に応じて前記公共用無線通信網または前記公衆用無線通信網のいずれか一方の通信網を選択して、前記公共用無線端末および前記公衆用無線端末の２つの無線端末のうち、選択した前記通信網と無線接続するいずれか一方の無線端末を使用して前記公共用業務のための無線通信を行う状態に設定する通信網選択手段を有し、
かつ、前記公共用業務に関する司令を発出する司令員が操作する統制卓に、前記公共用無線通信網および前記公衆用無線通信網の双方の通信網それぞれと通信を行う通信手段を有している、
ことを特徴とする。 (1) The public wireless communication area expansion system according to the present invention is
It is a public wireless communication area expansion system that expands the wireless communication area for conducting public business.
As a wireless terminal operated by a business worker who performs the public business, a public wireless terminal that wirelessly connects to a public wireless communication network independently installed for the public business and a public wireless communication service are provided. It has two wireless terminals, a public wireless terminal that wirelessly connects to the public wireless communication network.
And for both the public wireless terminal and the public wireless terminal,
It has a local connection means for locally connecting between the public wireless terminal and the public wireless terminal.
And to either the public wireless terminal or the public wireless terminal,
The communication network of either the public wireless communication network or the public wireless communication network is selected according to the condition of the received electric field received from both the public wireless communication network and the public wireless communication network. Then, of the two wireless terminals of the public wireless terminal and the public wireless terminal, one of the wireless terminals wirelessly connected to the selected communication network is used for wireless communication for the public business. Has a communication network selection means to set the state to perform
In addition, the control console operated by the commander who issues the command regarding the public business has a communication means for communicating with each of the communication networks of both the public wireless communication network and the public wireless communication network. ,
It is characterized by that.

（２）本発明による移動無線端末は、
公共用業務を行う業務従事者が操作する移動無線端末であって、
当該公共用業務のために独自に設置した公共用無線通信網と無線接続する公共用無線端末と、公衆用の無線通信サービスを行う公衆用無線通信網と無線接続する公衆用無線端末と、の双方の無線端末が有する実施手段を、一つの筐体内に一体化して実装している、
ことを特徴とする。 (2) The mobile wireless terminal according to the present invention is
It is a mobile wireless terminal operated by a business worker who performs public business.
A public wireless terminal that wirelessly connects to a public wireless communication network that is independently installed for the public business, and a public wireless terminal that wirelessly connects to a public wireless communication network that provides public wireless communication services. The implementation means of both wireless terminals are integrated and mounted in one housing.
It is characterized by that.

（３）本発明による公共用無線通信エリア拡張プログラムは、
公共用業務を行うための無線通信エリアを拡張する処理をコンピュータによって実行する公共用無線通信エリア拡張プログラムであって、
前記公共用業務を行う業務従事者が操作する無線端末として、当該公共用業務のために独自に設置した公共用無線通信網と無線接続する公共用無線端末と、公衆用の無線通信サービスを行う公衆用無線通信網と無線接続する公衆用無線端末と、の２つの無線端末を有し、
かつ、前記公共用無線端末および前記公衆用無線端末の双方に、
該公共用無線端末と該公衆用無線端末との間をローカルに接続するローカル接続機能を有し、
かつ、前記公共用無線端末または前記公衆用無線端末のいずれか一方に、
前記公共用無線通信網および前記公衆用無線通信網の双方の通信網から受信する受信電界の状況に応じて前記公共用無線通信網または前記公衆用無線通信網のいずれか一方の通信網を選択して、前記公共用無線端末および前記公衆用無線端末の２つの無線端末のうち、選択した前記通信網と無線接続するいずれか一方の無線端末を使用して前記公共用業務のための無線通信を行う状態に設定する通信網選択機能を有し、
かつ、前記公共用業務に関する司令を発出する司令員が操作する統制卓に、前記公共用無線通信網および前記公衆用無線通信網の双方の通信網それぞれと通信を行う通信機能を有している、
ことを特徴とする。 (3) The public wireless communication area expansion program according to the present invention is
It is a public wireless communication area expansion program that executes the process of expanding the wireless communication area for public business by a computer.
As a wireless terminal operated by a business worker who performs the public business, a public wireless terminal that wirelessly connects to a public wireless communication network independently installed for the public business and a public wireless communication service are provided. It has two wireless terminals, a public wireless terminal that wirelessly connects to the public wireless communication network.
And for both the public wireless terminal and the public wireless terminal,
It has a local connection function that locally connects the public wireless terminal and the public wireless terminal.
And to either the public wireless terminal or the public wireless terminal,
The communication network of either the public wireless communication network or the public wireless communication network is selected according to the condition of the received electric field received from both the public wireless communication network and the public wireless communication network. Then, of the two wireless terminals of the public wireless terminal and the public wireless terminal, one of the wireless terminals wirelessly connected to the selected communication network is used for wireless communication for the public business. Has a communication network selection function to set the state to perform
In addition, the control console operated by the commander who issues the command regarding the public business has a communication function for communicating with both the public wireless communication network and the public wireless communication network. ,
It is characterized by that.

本発明の公共用無線通信エリア拡張システム、移動無線端末および公共用無線通信エリア拡張プログラムによれば、主に、以下のような効果を奏することができる。 According to the public wireless communication area expansion system, the mobile wireless terminal, and the public wireless communication area expansion program of the present invention, the following effects can be mainly achieved.

すなわち、消防、防災、交通や防衛などのパブリックセーフティ(公共安全)の分野において、現状の技術のように公共団体が独自に自営インフラ用の無線設備として運営する公共用無線通信網のみを利用する場合には、通信圏外になって無線通信が不可能なエリアに業務従事者が移動した場合であっても、公衆用無線通信網の通信圏内に存在していれば、公共用の業務に関する無線通信を行うことが可能になるという効果を奏することができる。したがって、公共用無線通信網として無線基地局や無線中継局等の無線設備を増設することなく、公共用の業務に関する無線通信エリアを拡張することができる。 In other words, in the field of public safety (public safety) such as firefighting, disaster prevention, traffic and defense, only the public wireless communication network operated by public organizations as wireless equipment for self-employed infrastructure like the current technology is used. In some cases, even if a business worker moves out of the communication range to an area where wireless communication is not possible, as long as it is within the communication range of the public wireless communication network, the radio related to public business The effect of being able to communicate can be achieved. Therefore, it is possible to expand the wireless communication area related to public business without adding wireless equipment such as a wireless base station or a wireless relay station as a public wireless communication network.

本発明に係る公共用無線通信エリア拡張システムのシステム構成の一例を示すシステム構成図である。It is a system configuration diagram which shows an example of the system configuration of the public wireless communication area expansion system which concerns on this invention. 図１に示した公共用無線通信エリア拡張システムにおける無線通信の様子を模式的に示した説明図である。It is explanatory drawing which shows typically the state of wireless communication in the public wireless communication area expansion system shown in FIG. 図１に示した公共用無線通信エリア拡張システムの動作の一例を説明するためのフローチャートである。It is a flowchart for demonstrating an example of operation of the public wireless communication area expansion system shown in FIG. 図１の公共用無線通信エリア拡張システムにおいて公共用無線通信網を利用して業務従事者が無線通信を行う場合を示す説明図である。FIG. 5 is an explanatory diagram showing a case where a business worker performs wireless communication using a public wireless communication network in the public wireless communication area expansion system of FIG. 1. 図１の公共用無線通信エリア拡張システムにおいて公衆用無線通信網を利用して業務従事者が無線通信を行う場合を示す説明図である。FIG. 5 is an explanatory diagram showing a case where a business worker performs wireless communication using a public wireless communication network in the public wireless communication area expansion system of FIG. 1. 図１に示した公共用無線端末と公衆用無線端末とを同一筐体内に収納した一体型の移動無線端末の構成例を示す端末構成図である。FIG. 5 is a terminal configuration diagram showing a configuration example of an integrated mobile wireless terminal in which a public wireless terminal and a public wireless terminal shown in FIG. 1 are housed in the same housing.

以下、本発明による公共用無線通信エリア拡張システム、移動無線端末および公共用無線通信エリア拡張プログラムの好適な実施形態について添付図を参照して説明する。なお、以下には、本発明による公共用無線通信エリア拡張システム、移動無線端末について説明するが、かかる公共用無線通信エリア拡張システムおよび移動無線端末が有する機能を、コンピュータによって実行する公共用無線通信エリア拡張プログラムとして実施するようにしても良い。また、以下の各図面に付した図面参照符号は、理解を助けるための一例として各要素に便宜上付記したものであり、本発明を図示の態様に限定することを意図するものではないことは言うまでもない。 Hereinafter, preferred embodiments of the public wireless communication area expansion system, mobile wireless terminal, and public wireless communication area expansion program according to the present invention will be described with reference to the accompanying drawings. The public wireless communication area expansion system and mobile wireless terminal according to the present invention will be described below. Public wireless communication in which a computer executes the functions of the public wireless communication area expansion system and mobile wireless terminal. It may be implemented as an area expansion program. Further, it is needless to say that the drawing reference reference numerals attached to the following drawings are added to each element for convenience as an example for assisting understanding, and the present invention is not intended to be limited to the illustrated embodiment. No.

（本発明の特徴）
本発明の実施形態の説明に先立って、本発明の特徴についてその概要をまず説明する。本発明は、公共用無線通信網(消防／防災／交通／防衛等の公共用に専用の無線通信網)において通信することが可能な公共用無線端末（すなわち移動無線通信装置：携帯／車載通信装置)と、通信事業者が公衆用無線通信サービスとして提供する公衆用無線通信網(例えばＬＴＥ（Long Term Evolution）通信網等)において通信することが可能な公衆用無線端末（すなわち携帯無線端末：スマートフォン、携帯電話端末、タブレット端末等)と、の間をローカルに接続した構成（例えばＷｉ−Ｆｉ（Wireless Fidelity）規格に準拠の無線接続等を用いたローカル接続構成）とする。 (Features of the present invention)
Prior to the description of the embodiments of the present invention, the features of the present invention will be first outlined. The present invention relates to a public wireless terminal (that is, mobile wireless communication device: mobile / in-vehicle communication) capable of communicating in a public wireless communication network (a wireless communication network dedicated to public use such as firefighting / disaster prevention / traffic / defense). A public wireless terminal (that is, a portable wireless terminal) capable of communicating with a public wireless communication network (for example, an LTE (Long Term Evolution) communication network) provided by a communication operator as a public wireless communication service. A configuration in which a smartphone, a mobile phone terminal, a tablet terminal, etc. are locally connected (for example, a local connection configuration using a wireless connection compliant with the Wi-Fi (Wireless Fidelity) standard) is used.

そして、公衆用無線端末あるいは公共用無線端末のいずれか一方の無線端末に、公共用無線通信網と公衆用無線通信網とから受信した受信電界状況(圏外／圏内)に応じ、公共用無線通信網と公衆用無線通信網とのいずれの通信網を使用した無線通信を行うかを選択する通信網選択機能（すなわち通信種別選択制御機能）を有する制御アプリケーションを実装することを、主要な特徴としている。 Then, the public wireless communication is performed by either the public wireless terminal or the public wireless terminal according to the received electric field condition (out of service area / within the service area) received from the public wireless communication network and the public wireless communication network. The main feature is to implement a control application that has a communication network selection function (that is, a communication type selection control function) that selects which communication network, the network or the public wireless communication network, is used for wireless communication. There is.

ここで、該制御アプリケーションにより選択対象とする通信種別は、前述したように、
(１)公共用無線通信網(消防／防災／交通／防衛等の公共用に専用の無線通信網)を使用する無線通信と
(２) 通信事業者が公衆用無線通信サービスとして提供する公衆用無線通信網(例えばＬＴＥ通信網等)を使用する無線通信（ＬＴＥ通信網の場合はＩＰ（Internet Protocol）無線通信）と、
のいずれかである。 Here, the communication type to be selected by the control application is as described above.
(1) With wireless communication using a public wireless communication network (a wireless communication network dedicated to public use such as firefighting / disaster prevention / traffic / defense)
(2) Wireless communication using a public wireless communication network (for example, LTE communication network) provided by a telecommunications carrier as a public wireless communication service (IP (Internet Protocol) wireless communication in the case of LTE communication network) and
Is one of.

そして、前記制御アプリケーションは、公共用無線通信網と公衆用無線通信網とからの無線電波の受信電界の状況を監視し、公共用無線端末と公衆用無線端末とが、それぞれが無線接続する公共用無線通信網と公衆用無線通信網とのそれぞれの無線通信圏内にいずれも存在している場合には、公共用無線端末と公共用無線通信網とを優先して使用する通信種別を選択する。また、公共用無線通信網と公衆用無線通信網とのいずれか一方の通信網が通信圏外になった場合には、通信圏内にある他方の通信網を使用する通信種別に切り替えて使用することも、主要な特徴としている。 Then, the control application monitors the state of the receiving electric field of the radio radio wave from the public wireless communication network and the public wireless communication network, and the public wireless terminal and the public wireless terminal are connected wirelessly to each other. If both of the wireless communication network for public use and the wireless communication network for public use are within the respective wireless communication areas, the communication type to be used with priority given to the public wireless terminal and the public wireless communication network is selected. .. If either one of the public wireless communication network and the public wireless communication network goes out of the communication range, switch to the communication type that uses the other communication network within the communication range. Is also a major feature.

（本発明の実施形態）
次に、本発明に係る公共用無線通信エリア拡張システムの実施形態について、その一例を説明する。なお、本実施形態においては、公共用無線通信網（すなわち公共用の自営無線通信網）としては、例えば、ＳＣＰＣ(Single Channel Per Carrier)通信網（業務用デジタル無線網：周波数多重分割多元接続（ＦＤＭＡ：Frequency Division Multiple Access）の一つであって、１チャネル当たり１搬送波を割り当てる伝送方式を用いる無線通信網)を用いる。一方、通信事業者が公衆用無線通信サービスとして提供する公衆用無線通信網としては、例えば、ＬＴＥ（Long Term Evolution）規格に準拠したＬＴＥ通信網を用いる。 (Embodiment of the present invention)
Next, an example of an embodiment of the public wireless communication area expansion system according to the present invention will be described. In the present embodiment, the public wireless communication network (that is, the public self-employed wireless communication network) is, for example, an SCPC (Single Channel Per Carrier) communication network (commercial digital wireless network: frequency division multiple access). FDMA: Frequency Division Multiple Access), which uses a wireless communication network that uses a transmission method that allocates one carrier wave per channel). On the other hand, as a public wireless communication network provided by a telecommunications carrier as a public wireless communication service, for example, an LTE communication network compliant with the LTE (Long Term Evolution) standard is used.

そして、公共用無線通信網に無線接続することができる公共用無線端末と公衆用無線通信網に無線接続することができる公衆用無線端末との間を接続するためのローカル通信規格として、例えば、Ｗｉ−Ｆｉ通信方式を採用する。すなわち、本実施形態においては、公共用無線通信の通信エリアを拡張するために、Ｗｉ−Ｆｉ通信を利用して、公共用無線端末と公衆用無線端末との２つの無線端末間で情報の送受信を行い、公共用無線通信網の一例であるＳＣＰＣ通信網、公衆用無線通信網の一例であるＬＴＥ通信網の双方の通信網の受信電界の状況に応じて、いずれか一方の通信網を選択して、選択した通信網に無線接続することができる無線端末を使用することにより、公共用業務のための無線通信を行うことを可能としている。 Then, as a local communication standard for connecting between a public wireless terminal capable of wirelessly connecting to a public wireless communication network and a public wireless terminal capable of wirelessly connecting to a public wireless communication network, for example, A Wi-Fi communication method is adopted. That is, in the present embodiment, in order to expand the communication area of public wireless communication, information is transmitted / received between the public wireless terminal and the public wireless terminal by using Wi-Fi communication. Select one of the communication networks according to the reception electric field conditions of both the SCPC communication network, which is an example of a public wireless communication network, and the LTE communication network, which is an example of a public wireless communication network. By using a wireless terminal that can be wirelessly connected to the selected communication network, it is possible to perform wireless communication for public business.

（本発明の実施形態の構成例）
次に、本発明に係る公共用無線通信エリア拡張システムの構成例について、図１を用いて説明する。図１は、本発明に係る公共用無線通信エリア拡張システムのシステム構成の一例を示すシステム構成図である。 (Structure Example of Embodiment of this Invention)
Next, a configuration example of the public wireless communication area expansion system according to the present invention will be described with reference to FIG. FIG. 1 is a system configuration diagram showing an example of a system configuration of a public wireless communication area expansion system according to the present invention.

図１に示す公共用無線通信エリア拡張システム１００は、実際の現場において公共用の業務を行う業務従事者と公共用の業務に関する司令を発出する司令員との間の無線通信に関する無線通信エリアを拡張するためのシステム構成例を示しており、公共用無線通信網１０（すなわち業務用デジタル無線網例えばＳＣＰＣ通信網）と公衆用無線通信網２０（すなわち公衆用無線通信サービスを提供する無線通信網例えばＬＴＥ通信網）との２つの通信網を利用する構成としている。なお、公共用無線通信網１０は、１ないし複数の無線基地局１５や無線中継局により構成され、公衆用無線通信網２０は、１ないし複数の無線基地局２５（通常、無線中継機能付きの無線基地局２５）により構成されている。 The public wireless communication area expansion system 100 shown in FIG. 1 provides a wireless communication area for wireless communication between a worker who performs public business at an actual site and a commander who issues a command for public business. An example of a system configuration for expansion is shown, and a public wireless communication network 10 (that is, a commercial digital wireless network such as an SCPC communication network) and a public wireless communication network 20 (that is, a wireless communication network that provides a public wireless communication service) are shown. For example, it is configured to use two communication networks (LTE communication network). The public wireless communication network 10 is composed of one or more wireless base stations 15 and wireless relay stations, and the public wireless communication network 20 is composed of one or multiple wireless base stations 25 (usually, with a wireless relay function). It is composed of a radio base station 25).

そして、公共用業務に関する司令を発出する司令員が使用する統制卓３０は、公共用無線通信網１０と公衆用無線通信網２０との双方の通信網それぞれと通信を行う通信手段を有していて、いずれの通信網との間であっても、無線通信用の情報を送受信することが可能な構成となっている。なお、統制卓３０と双方の通信網それぞれの無線基地局１５および無線基地局２５との間は、図１には、有線接続している例を示しているが、無線接続するようにしても構わない。一方、業務従事者が使用する移動無線通信端末として、公共用無線通信網１０を利用するための公共用無線端末１１（例えば業務用デジタル無線端末：携帯／車載無線通信装置）と公衆用無線通信網２０を利用するための公衆用無線端末２１（例えばスマートフォン）との２つの無線端末を用いる。 The control desk 30 used by the commander who issues a command regarding public business has a communication means for communicating with each of the communication networks of both the public wireless communication network 10 and the public wireless communication network 20. Therefore, it is possible to send and receive information for wireless communication to and from any communication network. Although FIG. 1 shows an example of a wired connection between the control console 30 and the wireless base station 15 and the wireless base station 25 of both communication networks, it is possible to make a wireless connection. I do not care. On the other hand, as a mobile wireless communication terminal used by business workers, public wireless communication with a public wireless terminal 11 (for example, a commercial digital wireless terminal: a mobile / in-vehicle wireless communication device) for using the public wireless communication network 10. Two wireless terminals are used with a public wireless terminal 21 (for example, a smartphone) for using the network 20.

ここで、公共用無線端末１１と公衆用無線端末２１との間はローカル接続（例えばＷｉ−Ｆｉ接続）されている。つまり、公共用無線端末１１と公衆用無線端末２１とは、それぞれ、公共用無線通信網１０と公衆用無線通信網２０との無線接続用のアンテナの他に、互いをローカルに無線接続（例えばＷｉ−Ｆｉ接続）するためのアンテナも実装している。 Here, a local connection (for example, Wi-Fi connection) is made between the public wireless terminal 11 and the public wireless terminal 21. That is, the public wireless terminal 11 and the public wireless terminal 21 are locally wirelessly connected to each other (for example, in addition to the antenna for wireless connection between the public wireless communication network 10 and the public wireless communication network 20, respectively). An antenna for Wi-Fi connection) is also mounted.

また、公共用無線通信網１０としてＳＣＰＣ通信網を使用し、公衆用無線通信網２０としてＬＴＥ通信網を使用し、かつ、公共用無線端末１１と公衆用無線端末２１との間のローカル接続としてＷｉ−Ｆｉ接続を用いる場合には、図２に示すように、公共用無線端末１１は、内部に、ＳＣＰＣ通信制御部１１ａ、Ｗｉ−Ｆｉ通信制御部１１ｂ、公共用無線端末制御アプリケーション１１ｃを搭載している。一方、公衆用無線端末２１は、内部に、ＬＴＥ通信制御部２１ａ、Ｗｉ−Ｆｉ通信制御部２１ｂ、公衆用無線端末制御アプリケーション２１ｃを搭載している。 Further, the SCPC communication network is used as the public wireless communication network 10, the LTE communication network is used as the public wireless communication network 20, and the local connection between the public wireless terminal 11 and the public wireless terminal 21 is used. When Wi-Fi connection is used, as shown in FIG. 2, the public wireless terminal 11 is internally equipped with an SCPC communication control unit 11a, a Wi-Fi communication control unit 11b, and a public wireless terminal control application 11c. are doing. On the other hand, the public wireless terminal 21 is internally equipped with an LTE communication control unit 21a, a Wi-Fi communication control unit 21b, and a public wireless terminal control application 21c.

図２は、図１に示した公共用無線通信エリア拡張システム１００における無線通信の様子を模式的に示した説明図である。図２に示すように、業務従事者が,公共用無線端末１１を用いて、司令員の統制卓３０との間の無線通信を行う場合には、公共用無線端末１１の公共用無線端末制御アプリケーション１１ｃの動作に従って、ＳＣＰＣ通信制御部１１ａを動作させて、公共用無線通信網１０（ＳＣＰＣ通信網）の無線基地局１５や無線中継局を介して、統制卓３０との間で無線通信を行う。 FIG. 2 is an explanatory diagram schematically showing a state of wireless communication in the public wireless communication area expansion system 100 shown in FIG. As shown in FIG. 2, when a business worker uses the public wireless terminal 11 to perform wireless communication with the control desk 30 of the commander, the public wireless terminal 11 is controlled. According to the operation of the application 11c, the SCPC communication control unit 11a is operated to perform wireless communication with the control console 30 via the wireless base station 15 or the wireless relay station of the public wireless communication network 10 (SCPC communication network). Do.

一方、業務従事者が、公衆用無線端末２１を用いて、司令員の統制卓３０との間の無線通信を行う場合には、公衆用無線端末２１の公衆用無線端末制御アプリケーション２１ｃの動作に従って、ＬＴＥ通信制御部２１ａを動作させて、公衆用無線通信網２０（ＬＴＥ通信網）の無線基地局２５を介して、統制卓３０との間で無線通信を行う。 On the other hand, when a business worker uses the public wireless terminal 21 to perform wireless communication with the control desk 30 of the commander, the operation of the public wireless terminal control application 21c of the public wireless terminal 21 is followed. , The LTE communication control unit 21a is operated to perform wireless communication with the control desk 30 via the radio base station 25 of the public wireless communication network 20 (LTE communication network).

ここで、公共用無線端末１１と公衆用無線端末２１との間は、Ｗｉ−Ｆｉ通信によりローカル接続されていて、公共用無線端末制御アプリケーション１１ｃと公衆用無線端末制御アプリケーション２１ｃとの動作により公共用無線端末１１のＷｉ−Ｆｉ通信制御部１１ｂと公衆用無線端末２１のＷｉ−Ｆｉ通信制御部２１ｂとの間で、互いの動作状態に関する情報を送受信している。 Here, the public wireless terminal 11 and the public wireless terminal 21 are locally connected by Wi-Fi communication, and are public by the operation of the public wireless terminal control application 11c and the public wireless terminal control application 21c. Information on the operating state of each other is transmitted and received between the Wi-Fi communication control unit 11b of the wireless terminal 11 for use and the Wi-Fi communication control unit 21b of the public wireless terminal 21.

なお、公共用無線端末１１と公衆用無線端末２１との間でＷｉ−Ｆｉ通信を確実に行うことができるように、公共用無線端末１１と公衆用無線端末２１とは、常に、Ｗｉ−Ｆｉ通信エリア内の互いに近接した位置に配置されているものとする。例えば、公共用無線端末１１が、車載用ではなく、携帯用無線通信装置であった場合には、図１に示すように、業務従事者が、公衆用無線端末２１を手に持って保持している場合には、公共用無線端末１１は、当該業務従事者の身体の一部例えば腰の位置に装着する形で保持される。 In addition, the public wireless terminal 11 and the public wireless terminal 21 are always connected to each other so that Wi-Fi communication can be reliably performed between the public wireless terminal 11 and the public wireless terminal 21. It is assumed that they are located close to each other in the communication area. For example, when the public wireless terminal 11 is a portable wireless communication device instead of an in-vehicle device, as shown in FIG. 1, a business worker holds and holds the public wireless terminal 21 in his hand. If so, the public wireless terminal 11 is held in a form of being worn on a part of the body of the worker, for example, at the waist position.

すなわち、実際の現場で公共用業務を行う業務従事者が使用する無線端末として、当該公共用業務のために独自に設置した公共用無線通信網１０と無線接続する公共用無線端末１１と、公衆用の無線通信サービスを行う公衆用無線通信網２０と無線接続する公衆用無線端末２１と、の２つの無線端末を有している。そして、公共用無線端末１１と公衆用無線端末２１とには、互いの間をローカルに接続するローカル接続手段として、例えばＷｉ−Ｆｉ通信を行うＷｉ−Ｆｉ通信制御部１１ｂとＷｉ−Ｆｉ通信制御部２１ｂとをそれぞれ有している。 That is, as wireless terminals used by business workers who perform public business in the actual field, a public wireless terminal 11 that wirelessly connects to a public wireless communication network 10 independently installed for the public business, and the public It has two wireless terminals, a public wireless terminal 21 that wirelessly connects to a public wireless communication network 20 that provides a wireless communication service for the user. Then, as a local connection means for locally connecting the public wireless terminal 11 and the public wireless terminal 21 to each other, for example, a Wi-Fi communication control unit 11b that performs Wi-Fi communication and a Wi-Fi communication control Each has a part 21b.

ここで、業務従事者の発着信操作は、公共用無線通信網１０、公衆用無線通信網２０のいずれの通信網を利用する場合であっても、公衆用無線端末２１（例えばスマートフォン）を用いて操作することを可能にしても良い。すなわち、公衆用無線通信網２０を利用しようとする場合には、公衆用無線端末２１の発着信操作結果に基づいて、公衆用無線端末制御アプリケーション２１ｃの動作により、ＬＴＥ通信制御部２１ａを経由して、公衆用無線通信網２０（ＬＴＥ通信網）との間の発着信動作が実施される。 Here, in the incoming / outgoing operation of the business worker, the public wireless terminal 21 (for example, a smartphone) is used regardless of whether the communication network of the public wireless communication network 10 or the public wireless communication network 20 is used. It may be possible to operate it. That is, when the public wireless communication network 20 is to be used, the operation of the public wireless terminal control application 21c is performed via the LTE communication control unit 21a based on the result of the incoming / outgoing operation of the public wireless terminal 21. Then, the incoming / outgoing operation with the public wireless communication network 20 (LTE communication network) is carried out.

一方、公共用無線通信網１０を利用しようとする場合は、公衆用無線端末２１の発着信操作結果が、公衆用無線端末制御アプリケーション２１ｃの動作により、Ｗｉ−Ｆｉ通信制御部２１ｂを介して、公共用無線端末１１のＷｉ−Ｆｉ通信制御部１１ｂに伝達され、公共用無線端末１１の公共用無線端末制御アプリケーション１１ｃの動作により、ＳＣＰＣ通信制御部１１ａを経由して、公共用無線通信網１０（ＳＣＰＣ通信網）との間の発着信動作が実施される。 On the other hand, when the public wireless communication network 10 is to be used, the result of the incoming / outgoing operation of the public wireless terminal 21 is determined by the operation of the public wireless terminal control application 21c via the Wi-Fi communication control unit 21b. It is transmitted to the Wi-Fi communication control unit 11b of the public wireless terminal 11, and by the operation of the public wireless terminal control application 11c of the public wireless terminal 11, the public wireless communication network 10 is transmitted via the SCPC communication control unit 11a. The incoming / outgoing operation with (SCPC communication network) is carried out.

つまり、公共用無線端末１１と公衆用無線端末２１とのいずれか一方の無線端末には、公共用無線端末制御アプリケーション１１ｃまたは公衆用無線端末制御アプリケーション２１ｃとして（本実施形態においては、公衆用無線端末２１の公衆用無線端末制御アプリケーション２１ｃとして）、次のような通信網選択手段（すなわち通信種別選択制御手段）を有している。すなわち、公共用無線通信網１０および公衆用無線通信網２０の双方の通信網から受信する受信電界の状況に応じて、公共用無線通信網１０、公衆用無線通信網２０のいずれか一方の通信網を選択して、公共用無線端末１１、公衆用無線端末２１の２つの無線端末のうち、選択した前記通信網と無線接続するいずれか一方の無線端末を使用して、公共用業務のための無線通信を行う状態に設定する通信網選択手段を有している。 That is, the wireless terminal of either the public wireless terminal 11 or the public wireless terminal 21 is designated as a public wireless terminal control application 11c or a public wireless terminal control application 21c (in the present embodiment, the public wireless terminal 21c). As a public wireless terminal control application 21c of the terminal 21, it has the following communication network selection means (that is, communication type selection control means). That is, communication of either the public wireless communication network 10 or the public wireless communication network 20 is performed according to the condition of the receiving electric field received from both the public wireless communication network 10 and the public wireless communication network 20. For public business, select a network and use one of the two wireless terminals, the public wireless terminal 11 and the public wireless terminal 21, which wirelessly connects to the selected communication network. It has a communication network selection means for setting the state for wireless communication.

（本発明の実施形態の動作の説明）
次に、本発明の一実施形態として図１に示した公共用無線通信エリア拡張システム１００の動作について、その一例を、図３のフローチャートを参照しながら詳細に説明する。図３は、図１に示した公共用無線通信エリア拡張システム１００の動作の一例を説明するためのフローチャートであり、図１に示した公衆用無線端末２１（例、スマートフォン）において通信網を選択して使用する動作の一例を示している。なお、図３のフローチャートは、公衆用無線端末２１に、前述した通信網選択手段を公衆用無線端末制御アプリケーション２１ｃとして有している場合について説明している。 (Explanation of operation of the embodiment of the present invention)
Next, an example of the operation of the public wireless communication area expansion system 100 shown in FIG. 1 as an embodiment of the present invention will be described in detail with reference to the flowchart of FIG. FIG. 3 is a flowchart for explaining an example of the operation of the public wireless communication area expansion system 100 shown in FIG. 1, and a communication network is selected in the public wireless terminal 21 (eg, smartphone) shown in FIG. An example of the operation to be used is shown. The flowchart of FIG. 3 describes a case where the public wireless terminal 21 has the above-mentioned communication network selection means as the public wireless terminal control application 21c.

図３のフローチャートにおいて、公衆用無線端末２１（例、スマートフォン）は、あらかじめ定めた起動周期に達すると、まず、公衆用無線通信網２０（ＬＴＥ通信網）の無線基地局２５からの無線電波を受信するために、ＬＴＥ通信制御部２１ａを起動するとともに、公共用無線端末１１との間のローカル接続（Ｗｉ−Ｆｉ接続）を行うために、Ｗｉ−Ｆｉ通信制御部２１ｂを起動する（ステップＳ１） In the flowchart of FIG. 3, when the public wireless terminal 21 (eg, smartphone) reaches a predetermined activation cycle, it first receives radio waves from the wireless base station 25 of the public wireless communication network 20 (LTE communication network). In order to receive, the LTE communication control unit 21a is activated, and in order to make a local connection (Wi-Fi connection) with the public wireless terminal 11, the Wi-Fi communication control unit 21b is activated (step S1). )

ここで、公衆用無線端末２１は、公衆用無線端末制御アプリケーション２１ｃの動作により、ＬＴＥ通信制御部２１ａにおいて公衆用無線通信網２０の無線基地局２５からの受信電界をあらかじめ定めた周期で定期的に測定している。一方、公共用無線端末１１は、公共用無線端末制御アプリケーション１１ｃの動作により、ＳＣＰＣ通信制御部１１ａにおいて公共用無線通信網１０の無線基地局１５からの受信電界をあらかじめ定めた周期で定期的に測定している。そして、公共用無線端末１１は、測定した公共用無線通信網１０の無線基地局１５からの受信電界に関する情報を、Ｗｉ−Ｆｉ通信制御部１１ｂを介して、公衆用無線端末２１に対して、定期的に通知している。 Here, the public wireless terminal 21 periodically receives an electric field from the wireless base station 25 of the public wireless communication network 20 in the LTE communication control unit 21a by the operation of the public wireless terminal control application 21c at a predetermined cycle. Is measuring. On the other hand, the public wireless terminal 11 periodically receives an electric field from the wireless base station 15 of the public wireless communication network 10 in the SCPC communication control unit 11a by the operation of the public wireless terminal control application 11c at a predetermined cycle. I'm measuring. Then, the public wireless terminal 11 transmits the measured information on the received electric field from the wireless base station 15 of the public wireless communication network 10 to the public wireless terminal 21 via the Wi-Fi communication control unit 11b. We notify you regularly.

図３のフローチャートの説明に戻って、公衆用無線端末２１は、公衆用無線端末制御アプリケーション２１ｃの動作により、Ｗｉ−Ｆｉ通信制御部２１ｂを介して、公共用無線端末１１から送信されてきた公共用無線通信網１０の無線基地局１５からの受信電界に関する情報を受信する（ステップＳ２）。この結果、公衆用無線端末２１は、公衆用無線通信網２０の無線基地局２５および公共用無線通信網１０の無線基地局１５のそれぞれから受信した受信電界に関する情報を取得する。 Returning to the description of the flowchart of FIG. 3, the public wireless terminal 21 has been transmitted from the public wireless terminal 11 via the Wi-Fi communication control unit 21b by the operation of the public wireless terminal control application 21c. Information on the received electric field from the radio base station 15 of the wireless communication network 10 for use is received (step S2). As a result, the public wireless terminal 21 acquires information on the received electric field received from each of the wireless base station 25 of the public wireless communication network 20 and the wireless base station 15 of the public wireless communication network 10.

しかる後、公衆用無線端末２１は、自端末からの発信操作が行われたか、または、他の無線端末からの着信があったか否かを確認する（ステップＳ３）。発信操作や着信が発生していなかった場合には（ステップＳ３のＮＯ）、無線通信を行う状態にはなっていない待機状態であるので、図３の処理は終了し、次の起動周期まで待ち合わせる。 After that, the public wireless terminal 21 confirms whether or not the outgoing call operation from the own terminal has been performed or whether or not there has been an incoming call from another wireless terminal (step S3). If there is no outgoing call operation or incoming call (NO in step S3), the standby state is not in the state of performing wireless communication. Therefore, the process of FIG. 3 is completed and the process is waited until the next activation cycle. ..

これに対して、自端末からの発信操作または他の無線端末からの着信が発生した場合には（ステップＳ３のＹＥＳ）、ＬＴＥ通信制御部２１ａにおいて測定した公衆用無線通信網２０の無線基地局２５からの受信電界と、Ｗｉ−Ｆｉ通信制御部２１ｂを介して受信した公共用無線通信網１０の無線基地局１５からの受信電界と、に基づいて、公衆用無線端末２１および公共用無線端末１１が、それぞれの無線通信用として使用する通信網に関し、通信可能なエリア内（通信圏内）に存在しているか、あるいは、通信不可能なエリア（通信圏外）に存在しているかを判定する動作を行う。 On the other hand, when an outgoing call operation from the own terminal or an incoming call from another wireless terminal occurs (YES in step S3), the wireless base station of the public wireless communication network 20 measured by the LTE communication control unit 21a. Based on the received electric field from 25 and the received electric field from the radio base station 15 of the public wireless communication network 10 received via the Wi-Fi communication control unit 21b, the public wireless terminal 21 and the public wireless terminal 11 is an operation for determining whether the communication network used for each wireless communication exists in a communicable area (communication range) or in a non-communication area (outside the communication range). I do.

すなわち、まず、Ｗｉ−Ｆｉ通信制御部２１ｂを介して受信した公共用無線通信網１０の無線基地局１５からの受信電界に基づいて、公共用無線端末１１が、公共用無線通信網１０（ＳＣＰＣ通信網）の通信圏内に存在しているか否かを確認する（ステップＳ４）。 That is, first, based on the received electric field from the radio base station 15 of the public wireless communication network 10 received via the Wi-Fi communication control unit 21b, the public wireless terminal 11 sets the public wireless communication network 10 (SCPC). It is confirmed whether or not it exists within the communication range of the communication network) (step S4).

公共用無線端末１１が、公共用無線通信網１０（ＳＣＰＣ通信網）の通信圏内に存在していた場合には（ステップＳ４のＹＥＳ）、公衆用無線端末２１は、自端末が公衆用無線通信網２０（ＬＴＥ通信網）の通信圏内に存在しているか否かには関係なく、優先的に、公共用無線端末１１を使用して公共用無線通信網１０に対して発着信動作を行うことを選択する。つまり、公衆用無線端末２１は、公衆用無線端末制御アプリケーション２１ｃの動作により、Ｗｉ−Ｆｉ通信制御部２１ｂを介して、公共用無線通信網１０に対する発着信が発生している旨を、公共用無線端末１１に対して通知する。 When the public wireless terminal 11 exists within the communication range of the public wireless communication network 10 (SCPC communication network) (YES in step S4), the public wireless terminal 21 has its own terminal for public wireless communication. Priority is given to making and receiving calls to and from the public wireless communication network 10 using the public wireless terminal 11 regardless of whether or not it exists within the communication range of the network 20 (LTE communication network). Select. That is, the public wireless terminal 21 is for public use, indicating that the operation of the public wireless terminal control application 21c causes an incoming / outgoing call to / from the public wireless communication network 10 via the Wi-Fi communication control unit 21b. Notify the wireless terminal 11.

その結果、図４に示すように、公衆用無線端末２１からの該通知を受け取った公共用無線端末１１は、公共用無線端末制御アプリケーション１１ｃの動作により、ＳＣＰＣ通信制御部１１ａを経由して、公共用無線通信網１０との間の発着信処理を行う。つまり、業務従事者は、公共用無線端末１１を使用して、公共用無線通信網１０を利用することにより、発信先の無線端末や統制卓３０に対する発信接続動作を行ったり、発信元の無線端末や統制卓３０からの着信接続動作を行ったりする（ステップＳ５）。 As a result, as shown in FIG. 4, the public wireless terminal 11 that has received the notification from the public wireless terminal 21 passes through the SCPC communication control unit 11a by the operation of the public wireless terminal control application 11c. It processes incoming and outgoing calls to and from the public wireless communication network 10. That is, the business worker uses the public wireless terminal 11 to perform a outgoing connection operation to the destination wireless terminal or the control desk 30 by using the public wireless communication network 10, or the source wireless. Incoming call connection operation from the terminal or control console 30 is performed (step S5).

なお、かかる場合において、当該着信が、公共用無線通信網１０を経由して発生していた場合ではなく、公衆用無線通信網２０を経由して公衆用無線端末２１に対して直接着信していた場合には、公共用無線端末１１に対して着信の発生を通知することなく、そのまま、公衆用無線端末２１において着信処理を行うようにする。あるいは、場合によっては、該着信呼の発信元の無線端末に対して公共用無線通信網１０を指定した再発信処理を行うことを促すことにし、公衆用無線端末２１が、公衆用無線通信網２０ではなく公共用無線通信網１０を経由した着信呼を再度受け取るようにしても良い。 In such a case, the incoming call is not generated via the public wireless communication network 10, but is directly received from the public wireless terminal 21 via the public wireless communication network 20. In this case, the public wireless terminal 21 is used to process the incoming call as it is without notifying the public wireless terminal 11 of the occurrence of the incoming call. Alternatively, in some cases, the wireless terminal that is the source of the incoming call is urged to perform the re-transmission process by designating the public wireless communication network 10, and the public wireless terminal 21 is the public wireless communication network. The incoming call via the public wireless communication network 10 may be received again instead of the 20.

図４は、図１の公共用無線通信エリア拡張システム１００において公共用無線通信網１０を利用して業務従事者が無線通信を行う場合を示す説明図である。図４に示すように、公共用無線端末１１が公共用無線通信網１０の通信圏内に存在している場合には、公衆用無線端末２１が公衆用無線通信網２０の通信圏内に存在しているか否かには関係なく、公共用無線通信網１０を優先して利用して、業務従事者は、公共用無線端末１１を用いて、例えば統制卓３０との間の無線通信を行う。 FIG. 4 is an explanatory diagram showing a case where a business worker performs wireless communication by using the public wireless communication network 10 in the public wireless communication area expansion system 100 of FIG. As shown in FIG. 4, when the public wireless terminal 11 exists within the communication range of the public wireless communication network 10, the public wireless terminal 21 exists within the communication range of the public wireless communication network 20. Regardless of whether or not the public wireless communication network 10 is preferentially used, the business worker uses the public wireless terminal 11 to perform wireless communication with, for example, the control desk 30.

また、ステップＳ４において、公共用無線端末１１が、公共用無線通信網１０（ＳＣＰＣ通信網）の通信圏内ではなく通信圏外に存在していた場合には（ステップＳ４のＮＯ）、次に、公衆用無線端末２１は、ＬＴＥ通信制御部２１ａにおいて測定した公衆用無線通信網２０の無線基地局２５からの受信電界に基づいて、自端末が公衆用無線通信網２０（ＬＴＥ通信網）の通信圏内に存在しているか否かを確認する（ステップＳ６）。 Further, in step S4, if the public wireless terminal 11 exists outside the communication range of the public wireless communication network 10 (SCPC communication network) instead of within the communication range (NO in step S4), then the public The wireless terminal 21 is within the communication range of the public wireless communication network 20 (LTE communication network) based on the received electric field from the wireless base station 25 of the public wireless communication network 20 measured by the LTE communication control unit 21a. It is confirmed whether or not it exists in (step S6).

公衆用無線端末２１が、公衆用無線通信網２０（ＬＴＥ通信網）の通信圏内ではなく通信圏外に存在していた場合には（ステップＳ６のＮＯ）、公共用無線端末１１のみならず、公衆用無線端末２１に関しても、無線通信が不可能な状態にある。したがって、公衆用無線端末２１は、発信処理または着信処理に失敗したものと判定して、その旨を業務従事者に通知して、発着信動作を行うことなく、処理を終了する（ステップＳ７）。 When the public wireless terminal 21 exists outside the communication range of the public wireless communication network 20 (LTE communication network) instead of within the communication range (NO in step S6), not only the public wireless terminal 11 but also the public The wireless terminal 21 for use is also in a state where wireless communication is impossible. Therefore, the public wireless terminal 21 determines that the outgoing call processing or the incoming call processing has failed, notifies the business operator to that effect, and ends the process without performing the incoming / outgoing call operation (step S7). ..

これに対して、ステップＳ６において、公衆用無線端末２１が、公衆用無線通信網２０（ＬＴＥ通信網）の通信圏内に存在していた場合には（ステップＳ６のＹＥＳ）、公衆用無線端末２１は、公共用の業務に関する無線通信が可能な状態にある。したがって、公共用無線端末１１に関しては、公共用無線通信網１０の通信圏外に存在していて、無線通信を行うことができない状態にあるので、公衆用無線端末２１は、発生した発着信処理用の通信方式を、公共用無線通信網１０（ＳＣＰＣ通信網）を利用するＳＣＰＣ通信方式から公衆用無線通信網２０（ＬＴＥ通信網）を利用するＬＴＥ通信方式に切り替える（ステップＳ８）。 On the other hand, in step S6, if the public wireless terminal 21 exists within the communication range of the public wireless communication network 20 (LTE communication network) (YES in step S6), the public wireless terminal 21 Is in a state where wireless communication related to public business is possible. Therefore, since the public wireless terminal 11 exists outside the communication range of the public wireless communication network 10 and cannot perform wireless communication, the public wireless terminal 21 is used for processing incoming and outgoing calls. The communication method is switched from the SCPC communication method using the public wireless communication network 10 (SCPC communication network) to the LTE communication method using the public wireless communication network 20 (LTE communication network) (step S8).

その結果、図５に示すように、公衆用無線端末２１は、公衆用無線端末制御アプリケーション２１ｃの動作により、ＬＴＥ通信制御部２１ａを経由して、公衆用無線通信網２０との間の発着信処理を行う。つまり、業務従事者は、公衆用無線端末２１を使用して、公衆用無線通信網２０を利用することにより、発信先の無線端末や統制卓３０に対する発信接続動作を行ったり、発信元の無線端末や統制卓３０からの着信接続動作を行ったりする（ステップＳ９）。 As a result, as shown in FIG. 5, the public wireless terminal 21 makes and receives calls to and from the public wireless communication network 20 via the LTE communication control unit 21a by the operation of the public wireless terminal control application 21c. Perform processing. That is, the business worker uses the public wireless terminal 21 to perform a outgoing connection operation to the destination wireless terminal or the control desk 30 by using the public wireless communication network 20, or the source wireless. Incoming call connection operation from the terminal or control console 30 is performed (step S9).

図５は、図１の公共用無線通信エリア拡張システム１００において公衆用無線通信網２０を利用して業務従事者が無線通信を行う場合を示す説明図である。図５に示すように、公共用無線端末１１が公共用無線通信網１０の通信圏外に存在していて、かつ、公衆用無線端末２１が公衆用無線通信網２０の通信圏内に存在している場合には、業務従事者は、公衆用無線端末２１を用いて、公衆用無線通信網２０を利用して、例えば統制卓３０との間の無線通信を行う。 FIG. 5 is an explanatory diagram showing a case where a business worker performs wireless communication by using the public wireless communication network 20 in the public wireless communication area expansion system 100 of FIG. As shown in FIG. 5, the public wireless terminal 11 exists outside the communication range of the public wireless communication network 10, and the public wireless terminal 21 exists within the communication range of the public wireless communication network 20. In this case, the business worker uses the public wireless terminal 21 to perform wireless communication with, for example, the control desk 30 by using the public wireless communication network 20.

したがって、公共用無線端末１１が公共用無線通信網１０の通信圏外に存在しているような場合であっても、消防、防災、交通や防衛などの公共用の業務を行う業務従事者は、公衆用無線端末２１を用いて、無線通信エリアを拡大して無線通信を行うことが可能になる。 Therefore, even when the public wireless terminal 11 exists outside the communication range of the public wireless communication network 10, the business worker who performs public business such as firefighting, disaster prevention, traffic, and defense is not required. Using the public wireless terminal 21, it becomes possible to expand the wireless communication area and perform wireless communication.

以上のように、公衆用無線端末２１は、公衆用無線端末制御アプリケーション２１ｃの通信網選択手段としての動作を行った結果として、次のいずれかの通信網との無線接続を行うように設定することにより、公共用業務に関する無線通信エリアをさらに拡大して無線通信を行うことができる。 As described above, the public wireless terminal 21 is set to make a wireless connection with any of the following communication networks as a result of operating as the communication network selection means of the public wireless terminal control application 21c. As a result, the wireless communication area related to public business can be further expanded to perform wireless communication.

（１）公共用無線通信網１０および公衆用無線通信網２０から受信する受信電界のうち、いずれか一方の通信網からの受信電界が通信圏外を示している場合には、通信圏内の受信電界を示している他方の通信網を利用することを選択し、選択した前記他方の通信網と無線接続を行うように設定する。 (1) When the receiving electric field from one of the receiving electric fields received from the public wireless communication network 10 and the public wireless communication network 20 indicates outside the communication range, the receiving electric field in the communication range Select to use the other communication network indicating the above, and set to make a wireless connection with the other communication network selected.

例えば、公共用無線通信網１０が通信圏外であり、公衆用無線通信網２０が通信圏内であった場合には、公衆用無線通信網２０と無線接続する公衆用無線端末２１を使用して発着信処理を行い、公共用業務に関する無線通信を行うように設定する。逆に、公共用無線通信網１０が通信圏内であり、公衆用無線通信網２０が通信圏外であった場合には、公共用無線通信網１０と無線接続する公共用無線端末１１を使用して発着信処理を行い、公共用業務に関する無線通信を行うように設定する。 For example, when the public wireless communication network 10 is out of the communication range and the public wireless communication network 20 is within the communication range, the public wireless terminal 21 that wirelessly connects to the public wireless communication network 20 is used to generate the signal. Set to process incoming calls and perform wireless communication related to public business. On the contrary, when the public wireless communication network 10 is within the communication range and the public wireless communication network 20 is out of the communication range, the public wireless terminal 11 that wirelessly connects to the public wireless communication network 10 is used. Perform incoming / outgoing call processing and set to perform wireless communication related to public business.

（２）公共用無線通信網１０および公衆用無線通信網２０から受信する受信電界の双方とも通信圏内の受信電界を示している場合には、公共用無線通信網１０を優先して利用することを選択し、選択した公共用無線通信網１０と無線接続する公共用無線端末１１を使用して発着信処理を行い、公共用業務に関する無線通信を行うように設定する。 (2) If both the public wireless communication network 10 and the reception electric field received from the public wireless communication network 20 indicate the reception electric field within the communication range, the public wireless communication network 10 should be used with priority. Is selected, and the public wireless terminal 11 that wirelessly connects to the selected public wireless communication network 10 is used to perform incoming / outgoing call processing and set to perform wireless communication related to public business.

（３）公共用無線通信網１０および公衆用無線通信網２０から受信する受信電界の双方とも通信圏外の受信電界を示している場合には、公共用無線通信網１０および公衆用無線通信網２０のいずれも利用することができない旨を、公衆用無線端末２１を操作している業務従事者に対して通知して、発着信処理を行わないように設定する、 (3) When both the reception electric field received from the public wireless communication network 10 and the public wireless communication network 20 indicate a reception electric field outside the communication range, the public wireless communication network 10 and the public wireless communication network 20 Notify the business operator operating the public wireless terminal 21 that none of the above can be used, and set not to perform incoming / outgoing call processing.

なお、本実施形態の公共用無線通信エリア拡張システム１００においては、通信事業者が提供する公衆用無線通信網２０は、前述したように、例えば、ＬＴＥ通信網であり、ＩＰ（Internet Protocol）プロトコルを使用した無線通信をサポートしている通信網であって、かつ、消防、防災、交通や防衛などの公共用の業務に関する司令を発出する司令員が操作する統制卓３０においても、ＩＰプロトコルの通信をサポートしている。したがって、司令員と業務従事者との間の無線通信により送受信される公共用業務に関する情報として、音声データのみならず、静止画像、動画、文書、ＳＭＳ（Short Message Service）等を含む非音声データの情報に関してもＩＰプロトコルを用いて送受信することが可能である。 In the public wireless communication area expansion system 100 of the present embodiment, the public wireless communication network 20 provided by the communication operator is, for example, an LTE communication network and an IP (Internet Protocol) protocol, as described above. The IP protocol is also used in the control console 30 operated by the commander who issues commands related to public operations such as firefighting, disaster prevention, traffic and defense, which is a communication network that supports wireless communication using Supports communication. Therefore, as information on public business transmitted and received by wireless communication between the commander and the worker, not only voice data but also non-voice data including still images, videos, documents, SMS (Short Message Service), etc. It is also possible to send and receive the information of the above using the IP protocol.

また、前述した実施形態においては、公衆用無線端末２１に実装した公衆用無線端末制御アプリケーション２１ｃに、公共用無線通信網１０と公衆用無線通信網２０との２つの通信網を使い分ける通信網選択手段（すなわち通信種別選択制御手段）を有している場合について説明したが、本発明は、かかる場合に限るものではない。すなわち、公衆用無線端末２１、公共用無線端末１１のいずれか一方の無線端末に、該通信網選択手段（すなわち通信種別選択制御手段）を有するように構成すれば良い。つまり、場合によっては、公衆用無線端末２１ではなく、公共用無線端末１１に実装した公共用無線端末制御アプリケーション１１ｃに、公共用無線通信網１０と公衆用無線通信網２０との２つの通信網を使い分ける通信網選択手段（すなわち通信種別選択制御手段）を有するようにしても良い。 Further, in the above-described embodiment, the communication network selection of properly using two communication networks, the public wireless communication network 10 and the public wireless communication network 20, for the public wireless terminal control application 21c mounted on the public wireless terminal 21. Although the case of having the means (that is, the communication type selection control means) has been described, the present invention is not limited to such a case. That is, the wireless terminal of either the public wireless terminal 21 or the public wireless terminal 11 may be configured to have the communication network selection means (that is, the communication type selection control means). That is, in some cases, the public wireless terminal control application 11c mounted on the public wireless terminal 11 instead of the public wireless terminal 21 has two communication networks, the public wireless communication network 10 and the public wireless communication network 20. A communication network selection means (that is, a communication type selection control means) may be provided.

かかる場合には、業務従事者の発着信操作は、公共用無線通信網１０、公衆用無線通信網２０のいずれの通信網を利用する場合であっても、前述の実施形態の公衆用無線端末２１とは異なり、公共用無線端末１１（例えば携帯移動無線通信装置）を用いて通信網を選択する選択操作を可能にすれば良い。すなわち、公共用無線通信網１０を利用しようとする場合は、公共用無線端末１１の発着信操作結果に基づいて、公共用無線端末制御アプリケーション１１ｃの動作により、ＳＣＰＣ通信制御部１１ａを経由して、公共用無線通信網１０（ＳＣＰＣ通信網）との間の発着信動作が実施される。 In such a case, the public wireless terminal of the above-described embodiment can be used for making / receiving operations by a business worker regardless of whether the communication network of the public wireless communication network 10 or the public wireless communication network 20 is used. Unlike 21, it suffices to enable a selection operation for selecting a communication network by using a public wireless terminal 11 (for example, a portable mobile wireless communication device). That is, when the public wireless communication network 10 is to be used, the public wireless terminal control application 11c operates based on the result of the incoming / outgoing operation of the public wireless terminal 11 via the SCPC communication control unit 11a. , The incoming / outgoing operation with the public wireless communication network 10 (SCPC communication network) is carried out.

一方、公衆用無線通信網２０を利用しようとする場合は、公共用無線端末１１の発着信操作結果が、公共用無線端末制御アプリケーション１１ｃの動作により、Ｗｉ−Ｆｉ通信制御部１１ｂを介して、公衆用無線端末２１のＷｉ−Ｆｉ通信制御部２１ｂに伝達され、公衆用無線端末２１の公衆用無線端末制御アプリケーション２１ｃの動作により、ＬＴＥ通信制御部２１ａを経由して、公衆用無線通信網２０（ＬＴＥ通信網）との間の発着信動作が実施される。 On the other hand, when the public wireless communication network 20 is to be used, the result of the incoming / outgoing operation of the public wireless terminal 11 is determined by the operation of the public wireless terminal control application 11c via the Wi-Fi communication control unit 11b. It is transmitted to the Wi-Fi communication control unit 21b of the public wireless terminal 21, and by the operation of the public wireless terminal control application 21c of the public wireless terminal 21, the public wireless communication network 20 is transmitted via the LTE communication control unit 21a. The incoming / outgoing operation with (LTE communication network) is carried out.

（実施形態の効果の説明）
以上に詳細に説明したように、本実施形態においては、次のような効果を得ることができる。 (Explanation of the effect of the embodiment)
As described in detail above, the following effects can be obtained in the present embodiment.

すなわち、消防、防災、交通や防衛などのパブリックセーフティ(公共安全)の分野において、現状の技術のように、公共団体が独自に自営インフラ用の無線設備として運営する公共用無線通信網１０のみを利用する場合には通信圏外になって無線通信が不可能なエリアに業務従事者が移動した場合であっても、公衆用無線通信網２０の通信圏内に存在していれば、公共用の業務に関する無線通信を行うことが可能になるという効果を得ることができる。したがって、公共用無線通信網１０として無線基地局や無線中継局等の無線設備を増設することなく、公共用の業務に関する無線通信エリアを拡張することができる。 That is, in the field of public safety (public safety) such as firefighting, disaster prevention, traffic and defense, only the public wireless communication network 10 operated by a public organization as a wireless facility for self-employed infrastructure, like the current technology, is used. When using it, even if a business worker moves out of the communication range to an area where wireless communication is not possible, as long as it is within the communication range of the public wireless communication network 20, public business It is possible to obtain the effect that wireless communication can be performed. Therefore, it is possible to expand the wireless communication area related to public business without adding wireless equipment such as a wireless base station or a wireless relay station as the public wireless communication network 10.

さらに、公共用無線通信網１０、公衆用無線通信網２０のいずれの通信網を使用して無線通信を行うかという通信網選択に関する判断は、公共用無線通信網１０、公衆用無線通信網２０それぞれの無線基地局１５、無線基地局２５からの受信電界情報を受け取って、通信圏内か通信圏外かを判定した判定結果に基づいて、自動的に実施する仕組みを採用している。したがって、業務従事者は、通信網選択に関する判断のための一切の操作を行う必要がないので、公共用無線通信網１０、公衆用無線通信網２０の２種類の通信網を使い分けることによる利便性が損なわれることなく、無線通信エリアの拡大を実現することができる。 Further, the determination regarding the communication network selection of which of the public wireless communication network 10 and the public wireless communication network 20 is used for wireless communication is determined by the public wireless communication network 10 and the public wireless communication network 20. A mechanism is adopted in which the received electric field information from each of the radio base station 15 and the radio base station 25 is received and automatically implemented based on the determination result of determining whether the communication range is within or outside the communication range. Therefore, since it is not necessary for the business worker to perform any operation for determining the communication network selection, it is convenient to use two types of communication networks, the public wireless communication network 10 and the public wireless communication network 20. It is possible to expand the wireless communication area without impairing.

（本発明の他の実施形態）
前述した実施形態においては、実際の現場で公共用の業務に従事する業務従事者が無線通信を行うための無線端末として、公共用無線端末１１（携帯／車載移動無線通信装置）と公衆用無線端末２１（スマートフォン、携帯電話端末、タブレット端末等）との２種類の無線端末を有し、かつ、公共用無線端末１１と公衆用無線端末２１との間を、Ｗｉ−Ｆｉの無線通信によりローカル接続している場合について説明し、公衆用無線通信網２０はＬＴＥ網を用いて説明したが、本発明は、かかる場合に限るものではない。 (Other Embodiments of the present invention)
In the above-described embodiment, the public wireless terminal 11 (portable / in-vehicle mobile wireless communication device) and the public wireless are used as wireless terminals for the business workers engaged in public business in the actual field to perform wireless communication. It has two types of wireless terminals with the terminal 21 (smartphone, mobile phone terminal, tablet terminal, etc.), and is local between the public wireless terminal 11 and the public wireless terminal 21 by Wi-Fi wireless communication. The case of connection has been described, and the public wireless communication network 20 has been described using an LTE network, but the present invention is not limited to this case.

例えば、ローカル接続を行う手段として、Ｗｉ−Ｆｉの代わりにＢｌｕｅｔｏｏｔｈ（登録商標）でも良く、また、Ｗｉ−Ｆｉ等の無線通信の代わりに、公共用無線端末１１と公衆用無線端末２１との間をＵＳＢケーブルやＬＡＮケーブル等の有線ケーブルを用いて有線接続するように構成しても良い。さらに、公衆用無線通信網２０は、ＬＴＥ網の代わりに、第５世代移動通信システム（５Ｇ）を用いても良い。 For example, as a means for making a local connection, Bluetooth (registered trademark) may be used instead of Wi-Fi, and instead of wireless communication such as Wi-Fi, between the public wireless terminal 11 and the public wireless terminal 21. May be configured to be connected by wire using a wired cable such as a USB cable or a LAN cable. Further, the public wireless communication network 20 may use a 5th generation mobile communication system (5G) instead of the LTE network.

さらには、図６に示すように、公共用無線端末１１と公衆用無線端末２１とを同一筐体内に収納した一体型の移動無線端末４０として構成するようにしても良い。図６は、図１に示した公共用無線端末１１と公衆用無線端末２１とを同一筐体内に収納した一体型の移動無線端末４０の構成例を示す端末構成図である。 Further, as shown in FIG. 6, the public wireless terminal 11 and the public wireless terminal 21 may be configured as an integrated mobile wireless terminal 40 housed in the same housing. FIG. 6 is a terminal configuration diagram showing a configuration example of an integrated mobile wireless terminal 40 in which the public wireless terminal 11 and the public wireless terminal 21 shown in FIG. 1 are housed in the same housing.

図６に示す移動無線端末４０は、筐体の表面側に公共用無線通信に関する操作を行うための公共用無線通信パネル４１を実装し、筐体の裏面側に公衆用無線通信に関する操作を行う公衆用無線通信パネル４２を実装している例を示している。公共用無線通信パネル４１には、例えば現状の携帯型無線通信装置と同様の液晶パネル４１ａと操作キー４１ｂとが配置され、公衆用無線通信パネル４２には、例えばスマートフォンと同様の液晶パネル４２ａと操作ボタン４２ｂとが配置される。 The mobile wireless terminal 40 shown in FIG. 6 has a public wireless communication panel 41 mounted on the front surface side of the housing for performing operations related to public wireless communication, and performs operations related to public wireless communication on the back surface side of the housing. An example in which the public wireless communication panel 42 is mounted is shown. The public wireless communication panel 41 is provided with, for example, a liquid crystal panel 41a and an operation key 41b similar to those of the current portable wireless communication device, and the public wireless communication panel 42 is provided with, for example, a liquid crystal panel 42a similar to a smartphone. The operation button 42b and the operation button 42b are arranged.

そして、筐体内には、公共用業務のために独自に設置した公共用無線通信網１０と無線接続する公共用無線端末１１と、公衆用の無線通信サービスを行う公衆用無線通信網２０と無線接続する公衆用無線端末２１と、の双方の無線端末が有している実施手段を一体化して実装している。 Then, in the housing, a public wireless terminal 11 that wirelessly connects to the public wireless communication network 10 independently installed for public business, and a public wireless communication network 20 that provides a public wireless communication service and wirelessly The public wireless terminal 21 to be connected and the implementation means possessed by both wireless terminals are integrally implemented.

前記実施手段として、具体的には、公共用無線通信網１０との間の無線通信を行う公共用通信制御部例えばＳＣＰＣ通信制御部、公衆用無線通信網２０との間の無線通信を行う公衆用通信制御部例えばＬＴＥ通信制御部、および、公共用無線通信網１０と公衆用無線通信網２０との２つの通信網のいずれかを選択して、選択した通信網と接続する通信網選択部を少なくとも搭載している。すなわち、該通信網選択部は、公共用無線通信網１０および公衆用無線通信網２０の双方の通信網から受信する受信電界の状況に応じて、公共用無線通信網１０、公衆用無線通信網２０のいずれか一方の通信網を選択して、選択した該通信網と無線接続することにより公共用の業務のための無線通信を行う状態に設定する。 As the implementation means, specifically, a public communication control unit that performs wireless communication with the public wireless communication network 10, for example, an SCPC communication control unit, and a public that performs wireless communication with the public wireless communication network 20. Communication control unit For example, an LTE communication control unit and a communication network selection unit that selects one of two communication networks, the public wireless communication network 10 and the public wireless communication network 20, and connects to the selected communication network. Is installed at least. That is, the communication network selection unit sets the public wireless communication network 10 and the public wireless communication network according to the condition of the receiving electric field received from both the public wireless communication network 10 and the public wireless communication network 20. One of the 20 communication networks is selected and set to a state in which wireless communication for public business is performed by wirelessly connecting to the selected communication network.

以上、本発明の好適な実施形態の構成を説明した。しかし、かかる実施形態は、本発明の単なる例示に過ぎず、何ら本発明を限定するものではないことに留意されたい。本発明の要旨を逸脱することなく、特定用途に応じて種々の変形変更が可能であることが、当業者には容易に理解できよう。 The configuration of a preferred embodiment of the present invention has been described above. However, it should be noted that such embodiments are merely exemplary of the invention and do not limit the invention in any way. Those skilled in the art can easily understand that various modifications and modifications can be made according to a specific application without departing from the gist of the present invention.

１０公共用無線通信網
１１公共用無線端末
１１ａＳＣＰＣ通信制御部
１１ｂＷｉ−Ｆｉ通信制御部
１１ｃ公共用無線端末制御アプリケーション
１５無線基地局
２０公衆用無線通信網
２１公衆用無線端末
２１ａＬＴＥ通信制御部
２１ｂＷｉ−Ｆｉ通信制御部
２１ｃ公衆用無線端末制御アプリケーション
２５無線基地局
３０統制卓
４０移動無線端末
４１公共用無線通信パネル
４１ａ液晶パネル
４１ｂ操作キー
４２公衆用無線通信パネル
４２ａ液晶パネル
４２ｂ操作ボタン
１００公共用無線通信エリア拡張システム 10 Public wireless communication network 11 Public wireless terminal 11a SCPC communication control unit 11b Wi-Fi communication control unit 11c Public wireless terminal control application 15 Wireless base station 20 Public wireless communication network 21 Public wireless terminal 21a LTE communication control unit 21b Wi-Fi communication control unit 21c Public wireless terminal control application 25 Wireless base station 30 Control desk 40 Mobile wireless terminal 41 Public wireless communication panel 41a Liquid crystal panel 41b Operation key 42 Public wireless communication panel 42a Liquid crystal panel 42b Operation button 100 Public wireless communication area expansion system

Claims

It is a public wireless communication area expansion system that expands the wireless communication area for conducting public business.
As a wireless terminal operated by a business worker who performs the public business, a public wireless terminal that wirelessly connects to a public wireless communication network independently installed for the public business and a public wireless communication service are provided. It has two wireless terminals, a public wireless terminal that wirelessly connects to the public wireless communication network.
And for both the public wireless terminal and the public wireless terminal,
It has a local connection means for locally connecting between the public wireless terminal and the public wireless terminal.
And to either the public wireless terminal or the public wireless terminal,
The communication network of either the public wireless communication network or the public wireless communication network is selected according to the condition of the received electric field received from both the public wireless communication network and the public wireless communication network. Then, of the two wireless terminals of the public wireless terminal and the public wireless terminal, one of the wireless terminals wirelessly connected to the selected communication network is used for wireless communication for the public business. Has a communication network selection means to set the state to perform
In addition, the control console operated by the commander who issues the command regarding the public business has a communication means for communicating with each of the communication networks of both the public wireless communication network and the public wireless communication network. ,
A public wireless communication area expansion system characterized by this.

As the local connection means, either a wireless connection conforming to the Wi-Fi (Wireless Fidelity) standard or a wired connection using a wired cable is used.
The public wireless communication area expansion system according to claim 1.

The communication network selection means is
When the received electric field from one of the public wireless communication network and the received electric field received from the public wireless communication network indicates outside the communication range, the received electric field within the communication range is indicated. Select to use the other communication network, and set it to make a wireless connection with the other communication network selected.
Further, when both the public wireless communication network and the receiving electric field received from the public wireless communication network indicate the receiving electric field within the communication range, the public wireless communication network is preferentially used. Select and set to make a wireless connection with the selected public wireless communication network,
When both the public wireless communication network and the receiving electric field received from the public wireless communication network indicate a receiving electric field outside the communication range, the public wireless communication network and the public wireless communication network Set to notify the worker that none of them can be used.
The public wireless communication area expansion system according to claim 1 or 2.

The public wireless communication network is an LTE (Long Term Evolution) communication network, and as information transmitted and received by the public wireless terminal and the control console, not only voice data but also non-voice data is used by using an IP (Internet Protocol) protocol. The public wireless communication area expansion system according to any one of claims 1 to 3, wherein various information including data can be transmitted and received.

The public wireless communication network is an SCPC (Single Channel Per Carrier) communication network.
The public wireless communication area expansion system according to any one of claims 1 to 4, characterized in that.

It is a mobile wireless terminal operated by a business worker who performs public business.
A public wireless terminal that wirelessly connects to a public wireless communication network that is independently installed for the public business, and a public wireless terminal that wirelessly connects to a public wireless communication network that provides public wireless communication services. The implementation means of both wireless terminals are integrated and mounted in one housing.
A mobile wireless terminal characterized by that.

As the implementation means
A public communication control means for performing wireless communication with the public wireless communication network,
A public communication control means for performing wireless communication with the public wireless communication network,
Select either the public wireless communication network or the public wireless communication network according to the condition of the receiving electric field received from both the public wireless communication network and the public wireless communication network. Then, the communication network selection means for wirelessly connecting to the selected communication network and setting the state for performing wireless communication for the public business, and
The mobile wireless terminal according to claim 6, wherein the mobile wireless terminal has.

It is a public wireless communication area expansion program that executes the process of expanding the wireless communication area for public business by a computer.
As a wireless terminal operated by a business worker who performs the public business, a public wireless terminal that wirelessly connects to a public wireless communication network independently installed for the public business and a public wireless communication service are provided. It has two wireless terminals, a public wireless terminal that wirelessly connects to the public wireless communication network.
And for both the public wireless terminal and the public wireless terminal,
It has a local connection function that locally connects the public wireless terminal and the public wireless terminal.
And to either the public wireless terminal or the public wireless terminal,
The communication network of either the public wireless communication network or the public wireless communication network is selected according to the condition of the received electric field received from both the public wireless communication network and the public wireless communication network. Then, of the two wireless terminals of the public wireless terminal and the public wireless terminal, one of the wireless terminals wirelessly connected to the selected communication network is used for wireless communication for the public business. Has a communication network selection function to set the state to perform
In addition, the control console operated by the commander who issues the command regarding the public business has a communication function for communicating with both the public wireless communication network and the public wireless communication network. ,
A public wireless communication area expansion program characterized by this.

As the local connection function, either a wireless connection compliant with the Wi-Fi (Wireless Fidelity) standard or a wired connection using a wired cable is used.
8. The public wireless communication area expansion program according to claim 8.

The communication network selection function is
When the received electric field from one of the public wireless communication network and the received electric field received from the public wireless communication network indicates outside the communication range, the received electric field within the communication range is indicated. Select to use the other communication network, and set it to make a wireless connection with the other communication network selected.
Further, when both the public wireless communication network and the receiving electric field received from the public wireless communication network indicate the receiving electric field within the communication range, the public wireless communication network is preferentially used. Select and set to make a wireless connection with the selected public wireless communication network,
When both the public wireless communication network and the receiving electric field received from the public wireless communication network indicate a receiving electric field outside the communication range, the public wireless communication network and the public wireless communication network Set to notify the worker that none of them can be used.
The public wireless communication area expansion program according to claim 8 or 9.