JP4221958B2 - Wireless communication system - Google Patents

Wireless communication system Download PDF

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JP4221958B2
JP4221958B2 JP2002178294A JP2002178294A JP4221958B2 JP 4221958 B2 JP4221958 B2 JP 4221958B2 JP 2002178294 A JP2002178294 A JP 2002178294A JP 2002178294 A JP2002178294 A JP 2002178294A JP 4221958 B2 JP4221958 B2 JP 4221958B2
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wireless communication
base station
wireless
communication
communication terminal
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JP2004023613A (en
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秀行 林
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NEC Corp
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NEC Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、無線通信端末と、無線通信制御基地局と、無線通信制御基地局を収容するコア網とからなる無線通信システムに関する。
【０００２】
【従来の技術】
一般に、携帯電話システムや自動車電話システムなどのような移動通信が可能な無線通信システムは、図５に示すように、無線通信端末１Ａ，１Ｂと、無線通信制御基地局２Ａ，２Ｂと、コア網３とから構成される。
【０００３】
ここで、無線通信制御基地局２Ａの無線回線制御の管理領域内に位置する（存在する）無線通信端末１Ａと、無線通信制御基地局２Ｂの無線回線制御の管理領域内に存在する無線通信端末１Ｂとの間で無線通信を行う場合、無線通信端末１Ａから無線通信端末１Ｂへの通信経路は、無線通信端末１Ａ→無線通信制御基地局２Ａ→コア網３→無線通信制御基地局２Ｂ→無線通信端末１Ｂの経路となる。
【０００４】
一方、無線通信端末１Ａと無線通信端末１Ｂとが同一基地局である例えば無線通信制御基地局２Ａの無線回線制御の管理領域内に存在する場合は、無線通信端末１Ａから無線通信端末１Ｂへの通信経路は、無線通信端末１Ａ→無線通信制御基地局２Ａ→無線通信端末１Ｂとなり、無線通信端末１Ａと無線通信端末１Ｂとが同一基地局である例えば無線通信制御基地局２Ｂの無線回線制御の管理領域内に存在する場合は、無線通信端末１Ａから無線通信端末１Ｂへの通信経路は、無線通信端末１Ａ→無線通信制御基地局２Ｂ→無線通信端末１Ｂとなる。
【０００５】
【発明が解決しようとする課題】
ところで、一般的な移動通信システムでは、無線通信端末１Ａと無線通信端末１Ｂ間の無線通信の方法は、無線回線を管理する無線通信制御基地局２を中継する方法を採用している。
【０００６】
しかしながら、無線通信端末１Ａと無線通信端末１Ｂが同一無線通信制御基地局２の無線回線制御の管理領域内に存在する場合は、両者は無線通信制御基地局２を中継しなくても、直接無線通信を行える距離にあることから、このような場合は、無線通信制御基地局２を介さずに直接無線通信を行いたいという要望がある。
【０００７】
したがって、本発明は、各無線通信端末が無線通信制御基地局を中継して無線通信を行う間接無線通信と、各無線通信端末が無線通信制御基地局を中継せずに無線通信を行う直接無線通信とを必要に応じて切り替え可能にすることを目的とする。
【０００８】
【課題を解決するための手段】
本発明の無線通信システムは、無線通信端末と、無線通信端末と無線回線を介して無線接続が可能な基地局と、基地局を収容するコア網とからなる無線通信システムにおいて、
基地局は、自身の管理領域における通信トラフィック量を測定するとともに、測定結果を所定の条件として出力する監視部と、測定結果に応じて、無線回線の管理が可能な管理領域内に存在する無線通信端末間の通信の方法を、基地局が割り当てた空き無線回線を介して基地局を中継する通信方法を示す第１の通信方法、及び基地局が割り当てた空き無線回線を介して無線通信端末間の直接通信を行う通信方法を示す第２の通信方法の何れか一方に決定し、決定した通信方法を表す情報を一斉同報信号として基地局の管理領域内の各無線通信端末へ送信する送信部と、自身の稼働の有無を検出する稼働状態検出部と、稼動状態検出部の検出結果が非稼動であるときに、送信部に代わって、無線通信端末により使用可能な無線回線を検出し直接他の無線通信端末と無線通信を行う第３の通信方法を示す一斉同報信号を送信する送信予備局とを有し、管理領域の各無線通信端末は、一斉同報信号を受信する受信部と、相手無線通信端末と小電力による直接通信を行うための小電力無線通信手段と、受信した一斉同報信号に示される第１ないし第３の無線通信方法を含む複数の無線通信方法と、小電力による直接通信を示す第４の無線通信方法のいずれを優先して利用するかを設定する優先順位設定部とを有し、第２及び第３の無線通信方法による無線通信を、第４の無線通信方法に代えて行うことを可能とすることを特徴とする。
【００１２】
【発明の実施の形態】
以下、本発明について図面を参照して説明する。
図１は、本発明に係る無線通信システムにおける第１の無線通信方法を示す図である。本無線通信システムは、無線通信制御基地局（以下、基地局）２と、無線通信端末１Ａ，１Ｂと、後述するコア網３とからなり、図１の例は、基地局２の無線回線制御の管理領域内に無線通信端末１Ａ，１Ｂが存在する場合の例である。
【００１３】
第１の無線通信方法は、基地局２の管理領域内に存在する無線通信端末１Ａが同じく基地局２の管理領域内に存在する無線通信端末１Ｂと無線通信を行う場合、自身の管理領域の無線回線を管理しその制御を行う基地局２が無線通信端末１Ａ，１Ｂと無線回線制御情報ａをやりとりすることにより、無線通信端末１Ａと１Ｂとが基地局２を中継して無線通信を行う方法であり、したがってこの場合の通信経路は、無線通信端末１Ａ→基地局２→無線通信端末１Ｂとなる。
【００１４】
図２は、本無線通信システムにおける第２の無線通信方法を示す図である。第２の無線通信方法は、基地局２の管理領域内に存在する無線通信端末１Ａが同じく基地局２の管理領域内に存在する無線通信端末１Ｂと無線通信を行う場合、自身の管理領域の無線回線を管理しその制御を行う基地局２が無線通信端末１Ａ，１Ｂと無線回線制御情報ａをやりとりすることにより、無線通信端末１Ａ，１Ｂに使用可能な無線回線を割り当て、無線通信端末１Ａと１Ｂとがその無線回線を介して基地局２を中継しない直接無線通信ｂを行う方法であり、したがってこの場合の通信経路は、無線通信端末１Ａ→無線通信端末１Ｂとなる。
【００１５】
図３は、本無線通信システムにおける第３の無線通信方法を示す図である。第３の無線通信方法は、基地局２の管理領域内に存在する無線通信端末１Ａが同じく基地局２の管理領域内に存在する無線通信端末１Ｂと無線通信を行う場合、無線通信端末１Ａ自身が使用可能な無線回線を検出し、検出した無線回線を介して直接無線通信端末１Ｂと無線通信を行う方法であり、したがってこの場合の通信経路も、第２の無線通信方法と同様に無線通信端末１Ａ→無線通信端末１Ｂとなる。
【００１６】
図４は、本無線通信システムの詳細な構成を示すブロック図である。
ここで、無線通信システムを構成する無線通信端末１Ａ，１Ｂには、基地局２と無線回線制御情報ａ等を送受するとともに、他の無線通信端末と直接無線通信ｂを行うためのアンテナ１０ａと、他の無線通信端末と小電力無線通信ｃを行うためのアンテナ１０ｂと、基地局２側から送信される一斉同報制御信号を受信する一斉同報制御信号受信部（以下、受信部）１１と、無線回線を制御する無線回線制御部１２と、無線通信を検出する無線通信検出部１３と、無線通信の際の信号の衝突を防止する衝突防止処理部１４と、無線通信方法の優先順位が設定される優先順位設定部１５と、小電力無線通信方式を用いた無線通信手段（以下、小電力無線通信手段）１６とが設けられている。
【００１７】
一方、基地局２には、無線通信端末１Ａ，１Ｂと無線回線制御情報ａ等を送受するためのアンテナ２０と、無線通信端末１Ａ，１Ｂに対して一斉同報制御信号を送信する一斉同報制御信号送信部（以下、送信部）２１と、無線通信端末１Ａ，１Ｂが使用する無線回線を管理する無線回線管理部２２と、基地局２の管理領域内の通信トラフィック量を監視する通信トラフィック監視部２３と、無線通信端末１Ａ，１Ｂの無線回線を介する通信に対して課金する処理を行う課金処理部２４と、自身の稼働状態を検出する基地局稼働検出部２５とが設けられている。
【００１８】
また、コア網３には、無線通信端末１Ａ，１Ｂの無線回線を用いた通信に対する課金を含むシステム全体の課金を管理する課金管理部３１と、基地局２を含むこの無線通信システムの稼働状態を監視するシステム稼働監視部３２とが設けられている。
なお、基地局２が稼働しなくなったり、或いは基地局２における通信トラフィック量が増大して基地局２から一斉同報制御信号が送信できなくなることを考慮して、アンテナ４０及び一斉同報制御信号を送信する一斉同報制御信号送信部（以下、送信部）４１からなる一斉同報制御信号送信予備局（以下、送信予備局）４を設ける。
【００１９】
以上のように構成された本無線通信システムの動作を説明する。
基地局２の通信トラフィック監視部２３では、基地局２の無線回線制御の管理領域内の通信トラフィック量を測定している。基地局２の送信部２１では、通信トラフィック監視部２３の測定結果に応じて、前述の第１の無線通信方法と第２の無線通信方法の何れか一方の方法を決定し、決定した無線通信方法の内容を表す信号を一斉同報制御信号としてアンテナ２０を介し基地局２の管理領域内に存在する各無線通信端末１Ａ，１Ｂに同報送信する。すなわち、送信部２１では、通信トラフィック監視部２３により測定された通信トラフィック量が少ない場合は、第１の無線通信方法の内容を表す信号を各無線通信端末１Ａ，１Ｂに同報送信する一方、通信トラフィック監視部２３により測定された通信トラフィック量が多い場合は、第２の無線通信方法の内容を表す信号を各無線通信端末１Ａ，１Ｂに同報送信する。
【００２０】
各無線通信端末１Ａ，１Ｂでは、基地局２から無線信号として送信された無線通信方法の内容を表す一斉同報制御信号を、アンテナ１０ａを介して受信部１１で受信する。
ここで、例えば無線通信端末１Ａが無線通信端末１Ｂと通信を行う時に既に受信部１１で第１の無線通信方法を示す一斉同報制御信号を受信している場合は、各無線通信端末１Ａ，１Ｂは無線回線制御部１２の制御のもとに、基地局２により管理され基地局２から割り当てられた空き無線回線を介して基地局２を中継した通信を行う。一方、無線通信端末１Ａが無線通信端末１Ｂと通信を行う時に既に受信部１１で第２の無線通信方法を示す一斉同報制御信号を受信している場合は、各無線通信端末１Ａ，１Ｂは同様に無線回線制御部１２の制御のもとに、基地局２により管理され基地局２から割り当てられた空き無線回線を介して基地局２を中継しない直接無線通信を行う。
【００２１】
こうした第１の無線通信方法の場合は勿論、第２の無線通信方法においても、基地局２の無線回線管理部２２で無線回線の管理が行われるとともに、基地局２の課金処理部２４で各無線通信端末１Ａ，１Ｂの無線回線を介する通信に対する課金処理が実施される。ここで、コア網３に設けられた課金管理部３１は、各基地局の課金処理部２４で処理された課金情報を入力して入力した課金情報をもとに、無線通信システム全体の課金管理を行う。
【００２２】
ところで、基地局２が稼動していない場合には、前述したように基地局稼動検出部２５において基地局２が非稼動であることが検出される。送信予備局４は基地局稼働検出部２５により基地局２の非稼働が検出されると、基地局２の送信部２１に代わって送信予備局４の送信部４１がアンテナ４０を介し、前述した第３の無線通信方法を示す一斉同報制御信号を無線通信方法制御情報ｄとして、その基地局２の管理領域に存在する各無線通信端末１Ａ，１Ｂに同報送信する。
【００２３】
各無線通信端末１Ａ，１Ｂでは、送信予備局４から無線信号として送信された第３の無線通信方法を示す無線通信方法制御情報ｄを、アンテナ１０ａを介して受信部１１で受信する。
ここで、例えば無線通信端末１Ａが無線通信端末１Ｂと通信を行う際に既に受信部１１で第３の無線通信方法を示す無線通信方法制御情報ｄを受信している場合は、無線通信端末１Ａは他の無線通信端末の無線通信へ妨害を与えないために、既に無線通信が行われているか否かを無線通信検出部１３で検出し、既に他の無線通信端末により無線通信が行われていることが検出された場合は、衝突防止処理部１４でその無線通信との衝突防止を図る処理を行ったうえ、無線回線制御部１２の制御により無線回線を介し無線通信端末１Ｂと直接無線通信を行う。このように、基地局２が稼働していない場合は、各無線通信端末１Ａ，１Ｂは、基地局２により管理されない無線回線を介して直接無線通信を行う。
【００２４】
また、送信予備局４は、コア網３に設けられたシステム稼働監視部３２により、この無線通信システム内の基地局２を含む各部の非稼働が検出されると、同様に送信部４１がアンテナ４０を介し、前述した第３の無線通信方法を示す一斉同報制御信号を無線通信方法制御情報ｄとして、その基地局２の管理領域に存在する各無線通信端末１Ａ，１Ｂに同報送信することにより、各無線通信端末１Ａ，１Ｂ間の第３の無線通信方法による直接無線通信を行わせる。
【００２５】
ところで、この無線通信システムにおいて、前述の第１ないし第３の無線通信方法を含む複数の無線通信方法の実施が許可され、かつ複数の無線通信方法の選択が可能な場合には、無線通信端末１Ａ，１Ｂの優先順位設定部１５に無線通信方法の優先順位を設定し、無線通信端末１Ａ，１Ｂは、自身の優先順位設定部１５に登録されている優先順位にしたがって無線通信方法を決定する。
また、各無線通信端末１Ａ，１Ｂに小電力無線通信手段１６が設けられているときには、前述の第２及び第３の無線通信方法による無線通信をこの小電力無線通信手段１６により行うこともできる。こうした小電力無線通信手段１６よる小電力無線通信方法（即ち、アンテナ１０ｂを介して相手無線通信端末へ小電力で直接無線通信する第４の無線通信方法：基地局２の管理領域内において無線通信端末間の距離が数メートルから数十メートルの範囲の場合）も優先順位設定部１５に登録しておけば、無線通信システムの状況に応じた最適な無線通信方法を決定できる。こうした小電力無線通信手段１６よる小電力無線通信を備えておけば、他の無線通信システムへのアクセスが容易になる。
【００２６】
このように、本無線通信システムは、基地局２の無線回線制御の管理領域内に存在する無線通信端末１Ａ，１Ｂ間の通信の方法に、従来の移動通信システムでは実現されていない、基地局２を中継しない直接無線通信方法（第２及び第３の無線通信方法や前述の小電力による第４の無線通信方法）を追加し、基地局２の稼動状態や、基地局２の無線回線制御の管理領域内の通信トラフィック量などを考慮して、無線通信方法を適応的に切り換えるようにしたものである。したがって、基地局２が稼動しなくなったり、或いは通信トラフィック量が増大した時などに基地局２の無線回線制御の管理領域内に存在する無線通信端末１Ａ，１Ｂ間では直接無線通信を行うことが可能となり、この結果、災害時や無線通信システムの故障時などにおいて特に有効な手段を提供することができる。
【００２７】
【発明の効果】
以上説明したように本発明によれば、基地局により無線回線の管理が可能な管理領域内に存在する無線通信端末間の通信の方法を、例えば通信トラフィック量の多寡や基地局の稼働・非稼働などの所定の条件に応じて、基地局を中継する間接無線通信及び基地局を中継しない直接無線通信の何れか一方に決定し、決定した通信方法を表す情報を一斉同報信号として前記管理領域の無線通信端末に送信するとともに、前記管理領域の各無線通信端末は、送信された一斉同報信号を受信すると、受信した一斉同報信号に含まれる通信方法に応じた通信を行うようにしたので、基地局の管理領域に存在する各無線通信端末が基地局を中継して無線通信を行う間接無線通信と、各無線通信端末が基地局を中継せずに無線通信を行う直接無線通信とを必要に応じて切り替えできる。これにより、災害時や無線通信システムの故障時などの悪条件下においては各無線通信端末間では直接無線通信が可能になることから、こうした悪条件下における有効な通信手段として提供できる。
【図面の簡単な説明】
【図１】 本発明に係る無線通信システムの第１の無線通信方法を示す図である。
【図２】 上記無線通信システムの第２の無線通信方法を示す図である。
【図３】 上記無線通信システムの第３の無線通信方法を示す図である。
【図４】 上記無線通信システムを構成する各部の詳細構成を示すブロック図である。
【図５】 従来の無線通信方法を説明する図である。
【符号の説明】
１Ａ，１Ｂ…無線通信端末、２…無線通信制御基地局、３…コア網、４…一斉同報制御信号送信予備局、１０ａ，１０ｂ，２０，４０…アンテナ、１１…一斉同報制御信号受信部、１２…無線回線制御部、１３…無線通信検出部、１４…衝突防止処理部、１５…優先順位設定部、１６…小電力無線通信方式を用いた無線通信手段、２１，４１…一斉同報制御信号送信部、２２…無線回線管理部、２３…通信トラフィック量監視部、２４…課金処理部、２５…無線通信制御基地局稼働検出部、３１…課金管理部、３２…無線通信システム稼働監視部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio communication system including a radio communication terminal, a radio communication control base station, and a core network that accommodates the radio communication control base station.
[0002]
[Prior art]
In general, as shown in FIG. 5, a radio communication system capable of mobile communication such as a mobile phone system or a car phone system includes radio communication terminals 1A and 1B, radio communication control base stations 2A and 2B, and a core network. 3.
[0003]
Here, the radio communication terminal 1A located (exists) in the radio channel control management area of the radio communication control base station 2A, and the radio communication terminal existing in the radio channel control management area of the radio communication control base station 2B When performing wireless communication with 1B, the communication path from the wireless communication terminal 1A to the wireless communication terminal 1B is as follows: wireless communication terminal 1A → wireless communication control base station 2A → core network 3 → wireless communication control base station 2B → wireless It becomes the route of the communication terminal 1B.
[0004]
On the other hand, when the wireless communication terminal 1A and the wireless communication terminal 1B are in the same base station, for example, in the wireless channel control management area of the wireless communication control base station 2A, the wireless communication terminal 1A to the wireless communication terminal 1B The communication path is wireless communication terminal 1A → wireless communication control base station 2A → wireless communication terminal 1B, and wireless communication terminal 1A and wireless communication terminal 1B are the same base station. If it exists in the management area, the communication path from the wireless communication terminal 1A to the wireless communication terminal 1B is wireless communication terminal 1A → wireless communication control base station 2B → wireless communication terminal 1B.
[0005]
[Problems to be solved by the invention]
By the way, in a general mobile communication system, a method of relaying the wireless communication control base station 2 that manages a wireless line is adopted as a wireless communication method between the wireless communication terminal 1A and the wireless communication terminal 1B.
[0006]
However, if the wireless communication terminal 1A and the wireless communication terminal 1B exist within the wireless channel control management area of the same wireless communication control base station 2, they can be directly wirelessly connected without relaying the wireless communication control base station 2. In such a case, there is a desire to directly perform wireless communication without going through the wireless communication control base station 2 because the distance is within the communication range.
[0007]
Therefore, the present invention provides indirect wireless communication in which each wireless communication terminal relays a wireless communication control base station to perform wireless communication, and direct wireless communication in which each wireless communication terminal performs wireless communication without relaying the wireless communication control base station. The purpose is to enable communication to be switched as necessary.
[0008]
[Means for Solving the Problems]
The wireless communication system of the present invention is a wireless communication system comprising a wireless communication terminal, a base station that can be wirelessly connected to the wireless communication terminal via a wireless line, and a core network that accommodates the base station.
The base station measures the amount of communication traffic in its own management area, and outputs a measurement result as a predetermined condition , and a radio that exists in the management area that can manage the radio line according to the measurement result A first communication method showing a communication method for relaying a base station via a free wireless line assigned by the base station, and a wireless communication terminal via a free wireless line assigned by the base station The communication method is determined to be one of the second communication methods indicating the communication method for performing direct communication, and information representing the determined communication method is transmitted to each wireless communication terminal in the management area of the base station as a simultaneous broadcast signal a transmission unit, and the operating state detecting unit for detecting the presence or absence of its operation, when the operation state detection unit of the detection result is non-operational, in place of the transmitting unit, detecting an available radio channel by the wireless communication terminal Directly And a wireless communication terminal and transmitting the preliminary station transmitting broadcast signals simultaneously showing a third communication method for performing wireless communication, each wireless communication terminal management area, a receiver for receiving a broadcast signal A plurality of wireless communication methods including a low-power wireless communication means for performing direct communication with a partner wireless communication terminal with low power, and first to third wireless communication methods indicated by the received broadcast signal; A priority order setting unit that sets which of the fourth wireless communication methods indicating direct communication by power is to be used preferentially, and performs wireless communication by the second and third wireless communication methods, It is possible to carry out instead of the wireless communication method .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings.
FIG. 1 is a diagram showing a first wireless communication method in a wireless communication system according to the present invention. The wireless communication system includes a wireless communication control base station (hereinafter referred to as a base station) 2, wireless communication terminals 1A and 1B, and a core network 3 to be described later. The example of FIG. This is an example when the wireless communication terminals 1A and 1B exist in the management area.
[0013]
When the wireless communication terminal 1A existing in the management area of the base station 2 performs wireless communication with the wireless communication terminal 1B also existing in the management area of the base station 2, the first wireless communication method The base station 2 that manages and controls the radio channel exchanges radio channel control information a with the radio communication terminals 1A and 1B, so that the radio communication terminals 1A and 1B perform radio communication by relaying the base station 2. Therefore, the communication path in this case is wireless communication terminal 1A → base station 2 → wireless communication terminal 1B.
[0014]
FIG. 2 is a diagram illustrating a second wireless communication method in the wireless communication system. When the wireless communication terminal 1A existing in the management area of the base station 2 performs wireless communication with the wireless communication terminal 1B also existing in the management area of the base station 2, the second wireless communication method The base station 2 that manages and controls the radio channel exchanges radio channel control information a with the radio communication terminals 1A and 1B, thereby assigning usable radio channels to the radio communication terminals 1A and 1B. And 1B perform direct wireless communication b without relaying the base station 2 via the wireless line, and therefore the communication path in this case is wireless communication terminal 1A → wireless communication terminal 1B.
[0015]
FIG. 3 is a diagram illustrating a third wireless communication method in the wireless communication system. In the third wireless communication method, when the wireless communication terminal 1A existing in the management area of the base station 2 performs wireless communication with the wireless communication terminal 1B also existing in the management area of the base station 2, the wireless communication terminal 1A itself Is a method of detecting a usable wireless line and performing wireless communication directly with the wireless communication terminal 1B via the detected wireless line. Therefore, the communication path in this case is also wireless communication as in the second wireless communication method. Terminal 1A → wireless communication terminal 1B.
[0016]
FIG. 4 is a block diagram showing a detailed configuration of the wireless communication system.
Here, the radio communication terminals 1A and 1B constituting the radio communication system transmit and receive the radio channel control information a and the like with the base station 2 and the antenna 10a for directly performing radio communication b with other radio communication terminals. An antenna 10b for performing low-power wireless communication c with other wireless communication terminals, and a broadcast control signal receiving unit (hereinafter referred to as receiving unit) 11 for receiving a broadcast control signal transmitted from the base station 2 side A wireless channel control unit 12 that controls the wireless channel, a wireless communication detection unit 13 that detects wireless communication, a collision prevention processing unit 14 that prevents signal collision during wireless communication, and a priority order of wireless communication methods Are set, and a wireless communication means (hereinafter referred to as a low power wireless communication means) 16 using a low power wireless communication system is provided.
[0017]
On the other hand, the base station 2 transmits a broadcast control signal to the radio communication terminals 1A and 1B, and an antenna 20 for transmitting and receiving the radio communication terminals 1A and 1B and the radio channel control information a and the like. Control signal transmission unit (hereinafter referred to as transmission unit) 21, radio channel management unit 22 that manages radio channels used by radio communication terminals 1 A and 1 B, and communication traffic that monitors the amount of communication traffic in the management area of base station 2 A monitoring unit 23, a billing processing unit 24 that performs a billing process for communication via the wireless lines of the wireless communication terminals 1A and 1B, and a base station operation detection unit 25 that detects its own operating state are provided. .
[0018]
The core network 3 includes a charging management unit 31 that manages charging of the entire system including charging for communication using the wireless lines of the wireless communication terminals 1A and 1B, and an operating state of the wireless communication system including the base station 2 And a system operation monitoring unit 32 for monitoring the above.
In consideration of the fact that the base station 2 becomes inoperable or the amount of communication traffic in the base station 2 increases and the broadcast control signal cannot be transmitted from the base station 2, the antenna 40 and the broadcast control signal are transmitted. A broadcast control signal transmission spare station (hereinafter referred to as a transmission spare station) 4 comprising a simultaneous broadcast control signal transmission unit (hereinafter referred to as a transmission unit) 41 for transmitting.
[0019]
The operation of the wireless communication system configured as described above will be described.
The communication traffic monitoring unit 23 of the base station 2 measures the amount of communication traffic in the management area of the radio channel control of the base station 2. The transmission unit 21 of the base station 2 determines one of the first wireless communication method and the second wireless communication method according to the measurement result of the communication traffic monitoring unit 23, and the determined wireless communication A signal representing the contents of the method is broadcasted as a broadcast control signal to the radio communication terminals 1A and 1B existing in the management area of the base station 2 via the antenna 20. That is, in the transmission unit 21, when the communication traffic amount measured by the communication traffic monitoring unit 23 is small, a signal representing the content of the first wireless communication method is broadcast to each of the wireless communication terminals 1A and 1B. When the amount of communication traffic measured by the communication traffic monitoring unit 23 is large, a signal representing the content of the second wireless communication method is broadcast to each of the wireless communication terminals 1A and 1B.
[0020]
In each of the wireless communication terminals 1A and 1B, the reception unit 11 receives a broadcast control signal representing the content of the wireless communication method transmitted from the base station 2 as a wireless signal via the antenna 10a.
Here, for example, when the wireless communication terminal 1A communicates with the wireless communication terminal 1B, when the broadcast control signal indicating the first wireless communication method is already received by the receiving unit 11, each wireless communication terminal 1A, Under the control of the radio network controller 12, 1B performs communication relayed through the base station 2 through an empty radio channel managed by the base station 2 and assigned by the base station 2. On the other hand, when the wireless communication terminal 1A communicates with the wireless communication terminal 1B, if the reception unit 11 has already received a simultaneous broadcast control signal indicating the second wireless communication method, the wireless communication terminals 1A and 1B Similarly, under the control of the radio channel controller 12, direct radio communication is performed without relaying the base station 2 through an empty radio channel managed by the base station 2 and allocated from the base station 2.
[0021]
In the case of the first wireless communication method as well as the second wireless communication method, the wireless line management unit 22 of the base station 2 manages the wireless line, and the charging processing unit 24 of the base station 2 A billing process is performed for communication via the wireless line of the wireless communication terminals 1A and 1B. Here, the charging management unit 31 provided in the core network 3 inputs the charging information processed by the charging processing unit 24 of each base station, and based on the input charging information, the charging management of the entire wireless communication system I do.
[0022]
By the way, when the base station 2 is not operating, the base station operation detecting unit 25 detects that the base station 2 is not operating as described above. When the non-operation of the base station 2 is detected by the base station operation detection unit 25, the transmission spare station 4 replaces the transmission unit 21 of the base station 2 with the transmission unit 41 of the transmission preliminary station 4 via the antenna 40 as described above. A broadcast control signal indicating the third wireless communication method is broadcasted as wireless communication method control information d to the wireless communication terminals 1A and 1B existing in the management area of the base station 2.
[0023]
In each of the wireless communication terminals 1A and 1B, the reception unit 11 receives the wireless communication method control information d indicating the third wireless communication method transmitted as a wireless signal from the transmission standby station 4 via the antenna 10a.
Here, for example, when the wireless communication terminal 1A communicates with the wireless communication terminal 1B, if the reception unit 11 has already received wireless communication method control information d indicating the third wireless communication method, the wireless communication terminal 1A In order not to interfere with the wireless communication of other wireless communication terminals, the wireless communication detection unit 13 detects whether or not wireless communication has already been performed, and the wireless communication has already been performed by another wireless communication terminal. If it is detected, the collision prevention processing unit 14 performs a process for preventing the collision with the wireless communication, and the wireless communication control unit 12 controls the wireless communication terminal 1B to directly communicate with the wireless communication terminal 1B. I do. Thus, when the base station 2 is not operating, each of the wireless communication terminals 1A and 1B performs direct wireless communication via a wireless line that is not managed by the base station 2.
[0024]
In addition, when the system operation monitoring unit 32 provided in the core network 3 detects the non-operation of each unit including the base station 2 in the wireless communication system, the transmission standby station 4 similarly sets the transmission unit 41 to the antenna. 40, the broadcast control signal indicating the third wireless communication method described above is broadcasted as wireless communication method control information d to the wireless communication terminals 1A and 1B existing in the management area of the base station 2. Thus, direct wireless communication is performed between the wireless communication terminals 1A and 1B by the third wireless communication method.
[0025]
By the way, in this wireless communication system, when the implementation of a plurality of wireless communication methods including the first to third wireless communication methods described above is permitted and a plurality of wireless communication methods can be selected, a wireless communication terminal The priority order of the wireless communication method is set in the priority order setting unit 15 of 1A and 1B, and the wireless communication terminals 1A and 1B determine the wireless communication method according to the priority order registered in the priority order setting unit 15 of itself. .
Further, when the low-power wireless communication means 16 is provided in each of the wireless communication terminals 1A and 1B, the low-power wireless communication means 16 can perform wireless communication by the second and third wireless communication methods described above. . A low-power wireless communication method using the low-power wireless communication means 16 (that is, a fourth wireless communication method in which direct wireless communication is performed with low power to the counterpart wireless communication terminal via the antenna 10b: wireless communication within the management area of the base station 2 If the distance between terminals is in the range of several meters to several tens of meters), it is possible to determine an optimal wireless communication method according to the state of the wireless communication system by registering it in the priority setting unit 15. If such low power wireless communication means 16 is provided with low power wireless communication, access to other wireless communication systems is facilitated.
[0026]
Thus, this radio communication system is a base station that is not realized in the conventional mobile communication system in the method of communication between the radio communication terminals 1A and 1B existing in the radio channel control management area of the base station 2. 2 is added to the direct wireless communication method (second and third wireless communication methods and the fourth wireless communication method using the low power described above), and the operating state of the base station 2 and the wireless channel control of the base station 2 are added. The wireless communication method is adaptively switched in consideration of the amount of communication traffic in the management area. Therefore, direct radio communication can be performed between the radio communication terminals 1A and 1B existing in the radio channel control management area of the base station 2 when the base station 2 becomes inoperable or communication traffic increases. As a result, it is possible to provide a particularly effective means in the event of a disaster or failure of the wireless communication system.
[0027]
【The invention's effect】
As described above, according to the present invention, a communication method between wireless communication terminals existing in a management area where a base station can manage a wireless line can be set, for example, by a large amount of communication traffic or the operation / non-operation of a base station. According to a predetermined condition such as operation, either indirect wireless communication that relays the base station or direct wireless communication that does not relay the base station is determined, and information indicating the determined communication method is managed as a broadcast signal. In addition to transmitting to the wireless communication terminal in the area, each wireless communication terminal in the management area performs communication according to the communication method included in the received simultaneous broadcast signal when receiving the transmitted broadcast signal. Therefore, indirect wireless communication in which each wireless communication terminal existing in the management area of the base station relays the base station to perform wireless communication, and direct wireless communication in which each wireless communication terminal performs wireless communication without relaying the base station And must It can be switched in accordance with the. As a result, direct wireless communication is possible between the wireless communication terminals under adverse conditions such as a disaster or a failure of the wireless communication system, so that it can be provided as an effective communication means under such adverse conditions.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first wireless communication method of a wireless communication system according to the present invention.
FIG. 2 is a diagram illustrating a second wireless communication method of the wireless communication system.
FIG. 3 is a diagram illustrating a third wireless communication method of the wireless communication system.
FIG. 4 is a block diagram showing a detailed configuration of each part constituting the wireless communication system.
FIG. 5 is a diagram for explaining a conventional wireless communication method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1A, 1B ... Wireless communication terminal, 2 ... Wireless communication control base station, 3 ... Core network, 4 ... Broadcast control signal transmission spare station, 10a, 10b, 20, 40 ... Antenna, 11 ... Broadcast control signal reception , 12... Wireless channel control unit, 13... Wireless communication detection unit, 14... Collision prevention processing unit, 15... Priority setting unit, 16. Information control signal transmission unit, 22... Radio line management unit, 23... Communication traffic volume monitoring unit, 24 .. billing processing unit, 25... Radio communication control base station operation detection unit, 31. Monitoring department.

Claims (3)

無線通信端末と、前記無線通信端末と無線回線を介して無線接続が可能な基地局と、前記基地局を収容するコア網とからなる無線通信システムにおいて、
前記基地局は、
自身の前記管理領域における通信トラフィック量を測定するとともに、測定結果を前記所定の条件として出力する監視部と、
前記測定結果に応じて、
無線回線の管理が可能な管理領域内に存在する無線通信端末間の通信の方法を、
前記基地局が割り当てた空き無線回線を介して基地局を中継する通信方法を示す第１の通信方法、及び前記基地局が割り当てた空き無線回線を介して無線通信端末間の直接通信を行う通信方法を示す第２の通信方法の何れか一方に決定し、決定した通信方法を表す情報を一斉同報信号として前記基地局の管理領域内の各無線通信端末へ送信する送信部と、
自身の稼働の有無を検出する稼働状態検出部と、
前記稼動状態検出部の検出結果が非稼動であるときに、前記送信部に代わって、前記無線通信端末により使用可能な無線回線を検出し直接他の無線通信端末と無線通信を行う第３の通信方法を示す一斉同報信号を送信する送信予備局と
を有し、
前記管理領域の各無線通信端末は、
前記一斉同報信号を受信する受信部と、
相手無線通信端末と小電力による直接通信を行うための小電力無線通信手段と、
受信した前記一斉同報信号に示される前記第１ないし第３の無線通信方法を含む複数の無線通信方法と、前記小電力による直接通信を示す第４の無線通信方法のいずれを優先して利用するかを設定する優先順位設定部とを有し、
前記第２及び第３の無線通信方法による無線通信を、前記第４の無線通信方法に代えて行うことを可能とすることを特徴とする無線通信システム。In a wireless communication system comprising a wireless communication terminal, a base station capable of wireless connection with the wireless communication terminal via a wireless line, and a core network accommodating the base station,
The base station
A monitoring unit that measures the amount of communication traffic in its own management area and outputs a measurement result as the predetermined condition;
Depending on the measurement result,
A method of communication between wireless communication terminals existing in a management area where wireless line management is possible,
A first communication method showing a communication method for relaying a base station via an empty radio line assigned by the base station, and communication for performing direct communication between radio communication terminals via an empty radio line assigned by the base station a transmitting section method to determine the one of the second communication method illustrated, and transmits information indicating the determined communication method as broadcast signals to the respective wireless communication terminals in the management area of the base station,
An operating state detection unit that detects whether or not it is operating;
When the detection result of the operating state detecting unit is non-operating, a third wireless link that detects a wireless line usable by the wireless communication terminal and directly performs wireless communication with another wireless communication terminal on behalf of the transmitting unit A spare transmission station that transmits a broadcast signal indicating the communication method and
Have
Each wireless communication terminal in the management area is
A receiver for receiving the broadcast signal ;
Low-power wireless communication means for performing direct communication with a partner wireless communication terminal with low power;
Priority is given to a plurality of wireless communication methods including the first to third wireless communication methods indicated in the received broadcast signal and a fourth wireless communication method indicating direct communication with low power. A priority order setting unit for setting whether to
A wireless communication system, wherein wireless communication by the second and third wireless communication methods can be performed in place of the fourth wireless communication method . 前記無線通信端末は、
前記送信部から送信される一斉同報信号に含まれる第３の通信方法を表す情報を受信する受信部と、
新たな無線通信の開始時に既に前記受信部により第３の通信方法を表す情報が受信されている場合は、他の無線通信端末により無線通信が行われているか否かを検出する無線通信検出部と、
前記無線通信検出部により他の無線通信端末の無線通信が検出されると、この検出された無線通信との衝突を防止する処理を行って前記新たな無線通信を行わせる衝突防止処理部とを有することを特徴とする請求項１に記載の無線通信システム。The wireless communication terminal is
A receiver that receives information representing a third communication method included in the broadcast signal transmitted from the transmitter;
A wireless communication detection unit that detects whether or not wireless communication is being performed by another wireless communication terminal when information indicating the third communication method is already received by the reception unit at the start of new wireless communication When,
A collision prevention processing unit configured to perform a process of preventing a collision with the detected wireless communication and perform the new wireless communication when a wireless communication of another wireless communication terminal is detected by the wireless communication detection unit; The wireless communication system according to claim 1, further comprising: 前記基地局は、自身の管理領域に存在する各無線通信端末間における第１及び第２の通信方法に基づく通信に対して課金処理を行う課金処理部を有することを特徴とする請求項２に記載の無線通信システム。  The base station includes a charging processing unit that performs a charging process for communication based on the first and second communication methods between the wireless communication terminals existing in the management area of the base station. The wireless communication system described.
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US8634869B2 (en) * 2006-09-15 2014-01-21 Qualcomm Incorporated Methods and apparatus related to multi-mode wireless communications device supporting both wide area network signaling and peer to peer signaling
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