JP2010147682A - Radio communication system and indoor base station - Google Patents

Radio communication system and indoor base station Download PDF

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JP2010147682A
JP2010147682A JP2008321277A JP2008321277A JP2010147682A JP 2010147682 A JP2010147682 A JP 2010147682A JP 2008321277 A JP2008321277 A JP 2008321277A JP 2008321277 A JP2008321277 A JP 2008321277A JP 2010147682 A JP2010147682 A JP 2010147682A
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mobile station
base station
indoor base
station
communication system
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Shiro Sugawara
史朗 菅原
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Sharp Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To enable only specific mobile stations to be connected to indoor base stations with simple operation procedures. <P>SOLUTION: A radio communication system includes an outdoor base station, the indoor base station, and the mobile station. In the radio communication system, the indoor base station includes a means for permitting the connection of the mobile station when a propagation loss value to the mobile station is smaller than a prescribed value. Preferably, the indoor base station registers the mobile station identifier of the mobile station permitting connection in a storage means, and executes handover processing if the mobile station identifier of the mobile station to be handed over to the indoor base station has been registered in the storage means when receiving a handover request. By installing the indoor base station in a house subjected to locking management, only users who can enter a room can use the indoor base station for communication without any special prior registration procedures. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、無線通信システムおよび屋内基地局に関する。   The present invention relates to a wireless communication system and an indoor base station.

携帯電話サービスでは、建物の中、地下など、電波が届きにくい領域が存在する。このため、携帯電話の小型基地局であり、一般家庭の屋内やオフィスの一つの部屋、フロアなどをカバーするフェムトセル基地局が利用されている。しかし、一般家庭やオフィスは公共の場所ではないので、付近を通る他人にフェムトセル基地局が使用されてしまうことは望ましくない。そこで、移動局に応じてフェムトセル基地局への位置登録を許可または拒否する必要がある。   In mobile phone services, there are areas where radio waves are difficult to reach, such as in buildings and underground. For this reason, a femtocell base station that is a small base station of a cellular phone and covers a room, a floor, etc. of an ordinary home or an office is used. However, since ordinary homes and offices are not public places, it is not desirable that the femtocell base station be used by others passing nearby. Therefore, it is necessary to permit or reject location registration to the femtocell base station depending on the mobile station.

特許文献１には、所定の基地局について、位置登録を許可された移動局のみがその基地局に位置登録し、通信を可能とする技術が開示されている。すなわち、移動局が当該基地局のエリアに進入して、当該基地局のIDの受信を契機として当該移動局のIDと当該基地局のIDがコアネットワークのＶＬＲ（ビジター位置登録レジスタ）またはＮＲＮＣ（個人宅用基地局を管理／制御する新しいＲＮＣ（基地局制御装置））へ送信され、当該基地局への接続が許可された移動局であるかどうかが判定される。許可された移動局の場合には通信可能な状態にされ、そうでない場合はその移動局は通信できない状態にされる。
特開２００５−１０９５７０号公報 Patent Document 1 discloses a technology that allows only a mobile station whose location registration is permitted for a predetermined base station to register the location in the base station and enable communication. That is, when the mobile station enters the area of the base station and receives the ID of the base station, the ID of the mobile station and the ID of the base station are the VLR (visitor location registration register) or NRNC (core network) of the core network. It is transmitted to a new RNC (base station controller) that manages / controls the personal home base station, and it is determined whether the mobile station is permitted to connect to the base station. In the case of the permitted mobile station, communication is enabled. Otherwise, the mobile station is disabled.
JP 2005-109570 A

上記技術は、携帯電話の小型基地局を屋内に設置する場合、その屋内を管理する者が許可しない移動局が屋内基地局に位置登録して無線リソースを消費することを防止する。しかし、接続を許可する移動局の移動局IDをあらかじめコアネットワークに登録する必要があり、すなわち、事前の手順を必要とする。また、移動局から屋内基地局に位置登録要求が届いた場合には、コアネットワークへ移動局IDなどの情報を伝送して判断を仰ぐ必要がある。   In the above technology, when a small base station of a mobile phone is installed indoors, a mobile station that is not permitted by a person who manages the indoors is prevented from registering the location in the indoor base station and consuming radio resources. However, it is necessary to register the mobile station ID of the mobile station that is permitted to be connected to the core network in advance, that is, a prior procedure is required. In addition, when a location registration request arrives from the mobile station to the indoor base station, it is necessary to transmit information such as the mobile station ID to the core network for a determination.

本発明は、このような事情に鑑みてなされたもので、屋内基地局において移動局の接続を許可または拒否する手段を備えた無線通信システムを提供することを目的とする。   The present invention has been made in view of such circumstances, and an object thereof is to provide a wireless communication system including means for permitting or rejecting connection of a mobile station in an indoor base station.

本発明は上記の課題を解決するためになされたものであり、その一態様は、屋外基地局と、屋内基地局と、移動局とを備えた無線通信システムにおいて、前記屋内基地局は、前記移動局との間の伝播損失値が所定値より小さい場合に該移動局の接続を許可する手段を備えることを特徴とする。   The present invention has been made to solve the above problems, and one aspect thereof is a wireless communication system including an outdoor base station, an indoor base station, and a mobile station. A means for permitting connection of the mobile station when a propagation loss value with the mobile station is smaller than a predetermined value is provided.

好ましくは、上記無線通信システムの屋内基地局は、前記移動局から位置登録要求を受信した場合に、接続を許可する移動局の移動局識別子を記憶手段に登録し、該移動局の移動局識別子が前記記憶手段に登録されていれば位置登録処理を実行する。
好ましくは、上記無線通信システムの屋内基地局は、接続を許可する移動局の移動局識別子を記憶手段に登録し、ハンドオーバー要求を受信した場合に、該屋内基地局にハンドオーバーする移動局の移動局識別子が前記記憶手段に登録されていればハンドオーバー処理を実行する。
好ましくは、上記無線通信システムの移動局は、前記屋内基地局に位置登録要求を送信して拒否された場合に、一定時間の間、位置登録要求を再送しない。
好ましくは、上記無線通信システムの移動局は、同一の屋内基地局に位置登録している他の移動局とデータ通信することを許可する手段を備える。
好ましくは、上記無線通信システムは、前記屋内基地局に接続され、該屋内基地局の記憶手段に登録された移動局識別子および該屋内基地局に位置登録している移動局識別子および位置登録要求を受信したが前記記憶手段に登録されていないために位置登録要求拒否を送信した移動局識別子を該屋内基地局から取得して表示する表示装置をさらに備える。 Preferably, when the indoor base station of the wireless communication system receives a location registration request from the mobile station, the indoor base station registers the mobile station identifier of the mobile station permitted to connect in the storage means, and the mobile station identifier of the mobile station Is registered in the storage means, a position registration process is executed.
Preferably, the indoor base station of the wireless communication system registers the mobile station identifier of the mobile station to which connection is permitted in the storage unit, and when receiving a handover request, the indoor base station of the mobile station to be handed over to the indoor base station If the mobile station identifier is registered in the storage means, a handover process is executed.
Preferably, the mobile station of the wireless communication system does not retransmit the location registration request for a certain time when the location registration request is transmitted to the indoor base station and rejected.
Preferably, the mobile station of the wireless communication system includes means for permitting data communication with another mobile station whose location is registered in the same indoor base station.
Preferably, the wireless communication system includes a mobile station identifier connected to the indoor base station and registered in the storage means of the indoor base station, a mobile station identifier registered in the indoor base station, and a location registration request. A display device is further provided for acquiring and displaying from the indoor base station the mobile station identifier that has transmitted the location registration request rejection because it has been received but not registered in the storage means.

また、本発明の一態様の屋内基地局は、移動局との間の伝播損失値が所定値より小さい場合に該移動局の接続を許可する手段を備えることを特徴とする。   The indoor base station according to one aspect of the present invention includes means for permitting connection of a mobile station when a propagation loss value with the mobile station is smaller than a predetermined value.

本発明では、屋内基地局は、移動局との間の伝播損失値が所定値より小さい場合に当該移動局の接続を許可するので、屋内基地局を施錠管理された屋内に設置することにより、特別な事前の登録手順なく、入室することができたユーザのみ屋内基地局を使用して通信することができる。   In the present invention, the indoor base station allows connection of the mobile station when the propagation loss value with the mobile station is smaller than a predetermined value, so by installing the indoor base station indoors in a locked state, Only a user who can enter the room can communicate using the indoor base station without any special prior registration procedure.

また、本発明による移動局は、位置登録要求を拒否した屋内基地局に、一定時間の間、位置登録要求を再送しないので、屋内へ入室できず、接続が許可されていない移動局による屋内基地局へ位置登録要求の再送が抑制され、屋内基地局の負荷が軽減される。   In addition, the mobile station according to the present invention does not retransmit the location registration request for a certain period of time to the indoor base station that rejected the location registration request, so that the indoor base station by the mobile station that cannot enter the room and is not permitted to connect to the indoor base station. The retransmission of the location registration request to the station is suppressed, and the load on the indoor base station is reduced.

また、本発明による移動局は、同一の屋内基地局に位置登録している他の移動局とデータ通信することを許可する手段を備えるので、移動局同士がある一定のセキュリティを満たしていることが保証される。   In addition, since the mobile station according to the present invention includes means for permitting data communication with other mobile stations whose location is registered in the same indoor base station, the mobile stations satisfy certain security. Is guaranteed.

また、本発明では、屋内基地局に接続され、該屋内基地局の記憶手段に登録された移動局識別子および該屋内基地局に位置登録している移動局識別子および位置登録要求を受信したが前記記憶手段で登録されていないために位置登録拒否を送信した移動局識別子を該屋内基地局から取得して表示する表示装置をさらに備えるので、屋内の管理者が屋内に入った移動局を把握し、許可を意図しない移動局の屋内への進入を発見することが可能となり、セキュリティの確保に役立つ。   In the present invention, the mobile station identifier connected to the indoor base station and registered in the storage means of the indoor base station and the mobile station identifier registered in the indoor base station and the location registration request are received. Since it further includes a display device that acquires and displays the mobile station identifier that transmitted the location registration rejection because it is not registered in the storage means from the indoor base station, the indoor manager can grasp the mobile station that has entered the indoor This makes it possible to detect the entry of a mobile station that is not intended to be permitted into the indoor space, and helps to ensure security.

まず、図１を参照して本発明による無線通信システムの構成例を説明する。図１は本発明による無線通信システムの構成例を示す図である。図１において符号５０は建物の平面図を簡略的に表わし、一般に周囲が壁、窓、屋根などで仕切られている。すなわち、建物５０の内側が屋内、外側が屋外である。符号５１は人が出入りするドアを表わす。ドア５１にはセキュリティを確保するため施錠装置（図示せず）が設けられている。
フェムトセル基地局１０は屋内に設置された屋内基地局である。フェムトセル基地局１０、および、屋外に設置された屋外基地局であるマクロセル基地局２０はコアネットワーク４０に接続され、移動局３０に無線通信サービスを提供する。この無線通信サービスは、例えば、３Ｇ（第３世代携帯電話）、ＬＴＥ（Long Term Evolution（スーパー３Ｇとも呼ばれている））、４G(LTE-advanced)、WiMAX、WLANなどである。 First, a configuration example of a wireless communication system according to the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a configuration example of a radio communication system according to the present invention. In FIG. 1, reference numeral 50 simply represents a plan view of a building, and the periphery is generally partitioned by walls, windows, roofs, and the like. That is, the inside of the building 50 is indoor and the outside is outdoor. Reference numeral 51 represents a door through which a person enters and exits. The door 51 is provided with a locking device (not shown) to ensure security.
The femtocell base station 10 is an indoor base station installed indoors. The femtocell base station 10 and the macrocell base station 20, which is an outdoor base station installed outdoors, are connected to the core network 40 and provide a radio communication service to the mobile station 30. Examples of the wireless communication service include 3G (third generation mobile phone), LTE (Long Term Evolution (also called super 3G)), 4G (LTE-advanced), WiMAX, WLAN, and the like.

移動局３０は、フェムトセル基地局１０によって割り当てられた通信チャネルである伝送路１、または、マクロセル基地局２０によって割り当てられた通信チャネルである伝送路２を介して通信を行う。   The mobile station 30 performs communication via a transmission line 1 that is a communication channel assigned by the femtocell base station 10 or a transmission line 2 that is a communication channel assigned by the macrocell base station 20.

基地局は一般に移動局との間の伝播損失値を測定する機能を備えているが、本発明によるフェムトセル基地局１０は、移動局３０から位置登録要求を受信すると移動局３０との間の伝播損失値を測定し、所定値より小さい（減衰の度合いが小さい）場合に、コアネットワーク４０、フェムトセル基地局１０、移動局３０の間で既存の位置登録シーケンスに従った動作が行われる。上記所定値は、移動局３０が屋外に存在するときの伝播損失値と、移動局３０が屋内に存在するときの伝播損失値との中間に設定される。すなわち、フェムトセル基地局１０は、図４に示すように、移動局３０との間の伝播損失値を測定する伝播損失測定部１０１、上記所定値を記憶する所定値記憶部１０２、測定された伝播損失値と上記所定値とを比較する比較部１０３、比較結果に応じて基地局の動作を制御する制御部１０４を備える。
この構成によれば、フェムトセル基地局１０は、セキュリティを確保するために施錠装置が設けられた屋内に設置され、建物５０によって外部に存在する移動局とフェムトセル基地局１０との間に所定レベルの電波遮蔽が確保される。従って、開錠して入室した者が携帯する移動局のみが上記所定値より小さい伝播損失値を基地局に報告することができ、接続が許可される。なお、建物５０において電波が通過する換気口などがある場合には、例えば、金網を張ることによって所定レベルの電波遮蔽を確保することができる。 A base station generally has a function of measuring a propagation loss value with a mobile station, but when the femtocell base station 10 according to the present invention receives a location registration request from the mobile station 30, When the propagation loss value is measured and smaller than the predetermined value (the degree of attenuation is small), an operation according to the existing location registration sequence is performed among the core network 40, the femtocell base station 10, and the mobile station 30. The predetermined value is set between the propagation loss value when the mobile station 30 exists outdoors and the propagation loss value when the mobile station 30 exists indoors. That is, as shown in FIG. 4, the femtocell base station 10 is measured with a propagation loss measurement unit 101 that measures a propagation loss value with the mobile station 30, a predetermined value storage unit 102 that stores the predetermined value, A comparison unit 103 that compares the propagation loss value with the predetermined value and a control unit 104 that controls the operation of the base station according to the comparison result are provided.
According to this configuration, the femtocell base station 10 is installed indoors in which a locking device is provided in order to ensure security, and is predetermined between the mobile station existing outside by the building 50 and the femtocell base station 10. Level radio wave shielding is secured. Therefore, only the mobile station carried by the person who unlocks and enters the room can report the propagation loss value smaller than the predetermined value to the base station, and the connection is permitted. In addition, when there is a ventilation port or the like through which radio waves pass in the building 50, for example, a predetermined level of radio wave shielding can be ensured by installing a wire mesh.

また、フェムトセル基地局１０は記憶手段を備え、接続を許可する移動局の移動局ID（移動局識別子）を接続許可IDとして当該記憶手段に登録する。
また、フェムトセル基地局１０には、表示装置１２が接続されている。表示装置１２は、フェムトセル基地局１０の記憶手段に登録された移動局IDを読み出して表示し、また、フェムトセル基地局１０への位置登録が完了している移動局IDを読み出して表示し、また記憶手段に登録されていない移動局IDからの位置登録要求であったために位置登録拒否を送信した移動局IDを読み出して表示する機能を有する。これにより、移動局３０の所有者やフェムトセル基地局１０の管理者が容易に接続許可IDの登録状況、位置登録、接続許可しない移動局の状況を知ることができる。 Further, the femtocell base station 10 includes storage means, and registers the mobile station ID (mobile station identifier) of the mobile station that permits connection as a connection permission ID in the storage means.
A display device 12 is connected to the femtocell base station 10. The display device 12 reads out and displays the mobile station ID registered in the storage means of the femtocell base station 10, and reads out and displays the mobile station ID for which location registration to the femtocell base station 10 has been completed. In addition, the mobile station ID has a function of reading and displaying the mobile station ID that transmitted the location registration rejection because it was a location registration request from a mobile station ID not registered in the storage means. Thereby, the owner of the mobile station 30 or the administrator of the femtocell base station 10 can easily know the registration status of the connection permission ID, the location registration, and the status of the mobile station that does not permit connection.

次に、図２を参照して上述した無線通信システムの動作シーケンスの例を説明する。屋外においてマクロセル基地局２０に位置登録して待ちうけ状態であった移動局３０を携帯したユーザが建物５０に近づきドア５１の施錠装置を開錠して屋内に入る過程で、やがてマクロセル基地局２０よりフェムトセル基地局１０からの受信電力が大きくなる。これを認識した移動局３０はフェムトセル基地局１０へ位置登録要求を送信する（Ｓ１１）。フェムトセル基地局１０は移動局３０との間の伝播損失値（パスロス値）を測定し、所定値より小さいと判定すると（Ｓ１２）、位置登録要求に含まれる移動局IDを接続許可IDとしてフェムトセル基地局１０の記憶手段に登録する（Ｓ１３）。そして、記憶手段に移動局IDが登録されていれば、コアネットワーク４０、フェムトセル基地局１０、移動局３０の間で既存の位置登録シーケンスに従った動作が行われ（Ｓ１４）、正常に位置登録が完了すると、フェムトセル基地局１０から移動局３０に位置登録完了通知を送信する（Ｓ１５）。なお、位置登録シーケンスの一例は3GPP TS 23.401 V8.0.0 (2007年12月)の5.3.2 Attach procedureに記載されている。位置登録した移動局３０はフェムトセル基地局１０を介して無線通信サービスを利用することが可能となる。なお、Ｓ１２において、測定された伝播損失値が所定値より小さいという条件を満たさない場合は、フェムトセル基地局１０から移動局３０に位置登録拒否通知を送信する。   Next, an example of an operation sequence of the above-described wireless communication system will be described with reference to FIG. In the process in which a user carrying a mobile station 30 that has been in a waiting state after being registered with the macrocell base station 20 outdoors approaches the building 50 and unlocks the locking device of the door 51 and enters the indoors, the macrocell base station 20 Further, the received power from the femtocell base station 10 becomes larger. Recognizing this, the mobile station 30 transmits a location registration request to the femtocell base station 10 (S11). When the femtocell base station 10 measures the propagation loss value (path loss value) with the mobile station 30 and determines that the femtocell base station 10 is smaller than the predetermined value (S12), the femtocell base station 10 uses the mobile station ID included in the location registration request as a connection permission ID. Register in the storage means of the cell base station 10 (S13). Then, if the mobile station ID is registered in the storage means, an operation according to the existing location registration sequence is performed among the core network 40, the femtocell base station 10, and the mobile station 30 (S14). When the registration is completed, a location registration completion notification is transmitted from the femtocell base station 10 to the mobile station 30 (S15). An example of the location registration sequence is described in 5.3.2 Attach procedure of 3GPP TS 23.401 V8.0.0 (December 2007). The mobile station 30 whose location has been registered can use the wireless communication service via the femtocell base station 10. In S12, when the condition that the measured propagation loss value is smaller than the predetermined value is not satisfied, a location registration rejection notification is transmitted from the femtocell base station 10 to the mobile station 30.

また、ハンドオーバーは次のように行われる。屋外のマクロセル基地局２０と通信状態にある移動局３０を携帯したユーザが建物５０に近づきドア５１の施錠装置を開錠して屋内に入る過程で、やがてマクロセル基地局２０よりフェムトセル基地局１０からの受信電力が大きくなる。これを認識した移動局３０は、マクロセル基地局２０への測定報告の中で、屋内のフェムトセル基地局１０を受信電力が最も大きい基地局として報告することになり、マクロセル基地局２０はコアネットワーク４０にフェムトセル基地局１０へのハンドオーバーを指示し、コアネットワーク４０はフェムトセル基地局１０にハンドオーバー要求を送信する。フェムトセル基地局１０は、フェムトセル基地局１０にハンドオーバーする移動局である移動局３０の移動局IDが、フェムトセル基地局１０の記憶手段に接続許可IDとして登録されているか否か判定し、登録されている場合は既存のハンドオーバーのシーケンスに従った動作を行って移動局３０との接続を確立するが、登録されていない場合はハンドオーバー要求を拒否する。
上記の通り、フェムトセル基地局１０は接続許可IDを管理し、接続を許可するかどうか判断するので、コアネットワークへ移動局IDを伝送して接続許可を仰ぐ必要はない。
なお、図２の動作シーケンスにおいてＳ１３を行わず、すなわち、フェムトセル基地局１０は移動局３０が伝播損失値の条件を満たす場合でもその移動局IDを記憶手段に登録せず、フェムトセル基地局１０がコアネットワーク４０からハンドオーバー要求を受信したときに、図２のＳ１２と同様に、フェムトセル基地局１０にハンドオーバーする移動局である移動局３０との間の伝播損失値を測定し、所定値より小さい場合に既存のハンドオーバーのシーケンスに従った動作を行って移動局３０との接続を確立する形態としてもよい。 In addition, handover is performed as follows. In the process where the user carrying the mobile station 30 in communication with the outdoor macrocell base station 20 approaches the building 50 and unlocks the locking device of the door 51 and enters the indoor, the macrocell base station 20 eventually enters the femtocell base station 10. The received power from becomes larger. The mobile station 30 that has recognized this reports the indoor femtocell base station 10 as the base station with the highest received power in the measurement report to the macrocell base station 20, and the macrocell base station 20 The core network 40 transmits a handover request to the femtocell base station 10. The femtocell base station 10 determines whether or not the mobile station ID of the mobile station 30 that is a mobile station to be handed over to the femtocell base station 10 is registered in the storage unit of the femtocell base station 10 as a connection permission ID. If registered, an operation according to an existing handover sequence is performed to establish a connection with the mobile station 30, but if not registered, the handover request is rejected.
As described above, since the femtocell base station 10 manages the connection permission ID and determines whether or not to permit the connection, it is not necessary to transmit the mobile station ID to the core network and ask for the connection permission.
Note that S13 is not performed in the operation sequence of FIG. 2, that is, the femtocell base station 10 does not register the mobile station ID in the storage unit even when the mobile station 30 satisfies the condition of the propagation loss value, 10, when a handover request is received from the core network 40, the propagation loss value between the mobile station 30 which is a mobile station handed over to the femtocell base station 10 is measured in the same manner as S 12 in FIG. When the value is smaller than the predetermined value, a connection with the mobile station 30 may be established by performing an operation according to an existing handover sequence.

一実施形態において、移動局３０は、基地局に位置登録要求を送信して位置登録拒否通知を受信すると、当該基地局からの受信電波強度が大きい場合でも、一定時間の間、当該基地局に位置登録要求を再送しないように構成される。図３を参照してこの場合の動作シーケンスを説明する。図３は、移動局３０がフェムトセル基地局１０に位置登録要求を送信して位置登録拒否通知を受信する場合の動作シーケンスの例を示す。
屋外においてマクロセル基地局２０に位置登録して待ちうけ状態であった移動局３０を携帯したユーザが建物５０に近づくが、建物５０に入るわけではなくその前を通りかかっただけであっても、やがてマクロセル基地局２０よりも屋内のフェムトセル基地局１０からの受信電力が大きくなったとする。これを認識した移動局３０はフェムトセル基地局１０へ位置登録要求を送信する（Ｓ２１）。フェムトセル基地局１０は移動局３０との間の伝播損失値（パスロス値）を測定し（Ｓ２２）、所定値より小さいという条件を満たさないので、移動局３０に位置登録拒否通知を送信する（Ｓ２３）。移動局３０は位置登録拒否通知を受信して位置登録が拒否されたことを認識する。移動局が備える一般的な機能として、移動局３０は一定時間が経過すると位置登録要求を再送することになるが、フェムトセル基地局１０からの受信電波強度が大きい場合でも、一定時間の間、位置登録要求を送出せずに、上記の動作シーケンスが繰り返されることを防止する（Ｓ２４）。従って、マクロセル基地局２０に位置登録した移動局３０は、そのままマクロセル基地局２０に位置登録された状態を維持することになる。フェムトセル基地局１０に接続された表示装置１２には該登録拒否した移動局IDを表示し、フェムトセル基地局１０の所有者や管理者に接続許可しない移動局の進入を警告することができる。また、その際に測定されたパスロス値からフェムトセル基地局１０と移動局３０の距離を推測することで、ある一定以内の距離である際に特に強く警告表示することが可能となる。 In one embodiment, when the mobile station 30 transmits a location registration request to the base station and receives a location registration rejection notification, the mobile station 30 transmits the location registration request to the base station for a certain period of time even when the received radio wave strength from the base station is high. It is configured not to retransmit the location registration request. The operation sequence in this case will be described with reference to FIG. FIG. 3 shows an example of an operation sequence when the mobile station 30 transmits a location registration request to the femtocell base station 10 and receives a location registration rejection notification.
A user carrying a mobile station 30 that has been in a waiting state after being registered with the macro cell base station 20 approaches the building 50 outdoors. Assume that the received power from the indoor femtocell base station 10 is larger than that of the macrocell base station 20. Recognizing this, the mobile station 30 transmits a location registration request to the femtocell base station 10 (S21). The femtocell base station 10 measures the propagation loss value (path loss value) with the mobile station 30 (S22), and does not satisfy the condition of being smaller than the predetermined value, so transmits a location registration rejection notification to the mobile station 30 ( S23). The mobile station 30 receives the location registration rejection notification and recognizes that location registration has been rejected. As a general function provided in the mobile station, the mobile station 30 will retransmit the location registration request after a certain period of time, but even if the received radio wave intensity from the femtocell base station 10 is large, The above operation sequence is prevented from being repeated without sending a location registration request (S24). Therefore, the mobile station 30 whose location is registered in the macrocell base station 20 maintains the state in which the location is registered in the macrocell base station 20 as it is. The display unit 12 connected to the femtocell base station 10 displays the mobile station ID that has been rejected for registration, and can warn the owner or administrator of the femtocell base station 10 of the entry of a mobile station that is not permitted to connect. . In addition, by estimating the distance between the femtocell base station 10 and the mobile station 30 from the path loss value measured at that time, a particularly strong warning can be displayed when the distance is within a certain distance.

また、他の実施形態において、フェムトセル基地局１０に位置登録した移動局３０が建物５０の屋外へ出てマクロセル基地局２０に位置登録した場合、フェムトセル基地局１０は接続許可IDとして記憶手段に登録した移動局３０の移動局IDを抹消するように構成される。ここで、フェムトセル基地局１０は、移動局３０が他の基地局に位置登録したことを既存のシーケンスにより認識することができる。
上記の構成に代えて、フェムトセル基地局１０は、移動局３０の移動局IDを接続許可IDとして記憶手段に登録してからある一定時間後に抹消するように構成してもよい。
いずれの構成も、フェムトセル基地局１０の記憶手段に再度使用されない接続許可IDが蓄積されることを防止することができる。 In another embodiment, when the mobile station 30 registered in the femtocell base station 10 goes out of the building 50 and registers in the macrocell base station 20, the femtocell base station 10 stores the connection permission ID as a storage permission ID. The mobile station ID of the mobile station 30 registered in is deleted. Here, the femtocell base station 10 can recognize from the existing sequence that the mobile station 30 has registered its location with another base station.
Instead of the configuration described above, the femtocell base station 10 may be configured to be deleted after a certain period of time after the mobile station ID of the mobile station 30 is registered in the storage unit as the connection permission ID.
In any configuration, it is possible to prevent accumulation of connection permission IDs that are not used again in the storage unit of the femtocell base station 10.

また、他の実施形態において、フェムトセル基地局１０に移動局IDが登録された移動局であることを相互に確認した上でデータ伝送を許可することによりセキュリティを確保することができる。
移動局は、既存のシーケンスにより、位置登録している基地局のセル番号およびセル情報を取得することができる。また、移動局は、図２の動作シーケンスに従った動作を行う機能が実装された屋内基地局のセル番号を予め設定する手段をさらに備えるように構成される。
このとき、次のような手順でデータ通信を行うことができる。移動局３０と移動局３１（図示せず）がともに建物５０の屋内に入ると、フェムトセル基地局１０に位置登録され、フェムトセル基地局１０からセル番号を取得する。移動局３０または移動局３１のいずれか一方が他方にデータ通信の開始を要求すると、移動局３０と移動局３１は、位置登録している基地局から取得したセル番号を交換する。移動局３０と移動局３１は、セル番号が互いに一致し、かつ、上記の予め設定されたセル番号とも一致することを確認すると、それぞれに記録されている静止画、動画などのデータ通信を開始する。このような手順によれば、移動局３０と移動局３１のどちらも入室を許可され、同一レベルセキュリティを満たしていることが保証される。 In another embodiment, security can be ensured by permitting data transmission after mutually confirming that the mobile station ID is registered in the femtocell base station 10.
The mobile station can acquire the cell number and cell information of the base station whose location is registered using an existing sequence. Further, the mobile station is configured to further include means for presetting the cell number of the indoor base station in which the function of performing the operation according to the operation sequence of FIG. 2 is installed.
At this time, data communication can be performed according to the following procedure. When both the mobile station 30 and the mobile station 31 (not shown) enter the building 50, the location is registered in the femtocell base station 10 and the cell number is acquired from the femtocell base station 10. When either one of the mobile station 30 or the mobile station 31 requests the other to start data communication, the mobile station 30 and the mobile station 31 exchange the cell numbers acquired from the location-registered base stations. When the mobile station 30 and the mobile station 31 confirm that the cell numbers match each other and also the above-mentioned preset cell numbers, the mobile station 30 and the mobile station 31 start data communication such as still images and moving images recorded in the respective cell stations. To do. According to such a procedure, both the mobile station 30 and the mobile station 31 are permitted to enter the room, and it is guaranteed that the same level security is satisfied.

本発明は、携帯電話サービスなどを提供する無線通信システムに適用することができる。   The present invention can be applied to a wireless communication system that provides a mobile phone service or the like.

本発明による無線通信システムの構成例を示す図である。It is a figure which shows the structural example of the radio | wireless communications system by this invention. 図１の無線通信システムにおける動作シーケンスの例を示す図である。It is a figure which shows the example of the operation | movement sequence in the radio | wireless communications system of FIG. 移動局がフェムトセル基地局に位置登録要求を送信して位置登録拒否通知を受信する場合の動作シーケンスの例を示す図である。It is a figure which shows the example of an operation | movement sequence in case a mobile station transmits a location registration request to a femtocell base station and receives a location registration rejection notification. フェムトセル基地局の構成例を示す図である。It is a figure which shows the structural example of a femtocell base station.

符号の説明Explanation of symbols

１０・・・フェムトセル基地局、１２・・・表示装置、２０・・・マクロセル基地局、３０・・・移動局、４０・・・コアネットワーク、５０・・・建物、５１・・・ドア   DESCRIPTION OF SYMBOLS 10 ... Femtocell base station, 12 ... Display apparatus, 20 ... Macrocell base station, 30 ... Mobile station, 40 ... Core network, 50 ... Building, 51 ... Door

Claims (7)

屋外基地局と、屋内基地局と、移動局とを備えた無線通信システムにおいて、
前記屋内基地局は、前記移動局との間の伝播損失値が所定値より小さい場合に該移動局の接続を許可する手段を備えることを特徴とする無線通信システム。 In a wireless communication system comprising an outdoor base station, an indoor base station, and a mobile station,
The indoor base station includes a means for permitting connection of a mobile station when a propagation loss value with the mobile station is smaller than a predetermined value. 前記屋内基地局は、前記移動局から位置登録要求を受信した場合に、接続を許可する移動局の移動局識別子を記憶手段に登録し、該移動局の移動局識別子が前記記憶手段に登録されていれば位置登録処理を実行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。   When the indoor base station receives a location registration request from the mobile station, the indoor base station registers the mobile station identifier of the mobile station permitted to connect in the storage unit, and the mobile station identifier of the mobile station is registered in the storage unit. 2. The wireless communication system according to claim 1, wherein a location registration process is executed if it exists. 前記屋内基地局は、接続を許可する移動局の移動局識別子を記憶手段に登録し、ハンドオーバー要求を受信した場合に、該屋内基地局にハンドオーバーする移動局の移動局識別子が前記記憶手段に登録されていればハンドオーバー処理を実行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 indoor base station registers the mobile station identifier of the mobile station that permits connection in the storage means, and when the handover request is received, the mobile station identifier of the mobile station to be handed over to the indoor base station is the storage means The wireless communication system according to claim 1, wherein a handover process is executed if registered in the wireless communication system. 前記移動局は、前記屋内基地局に位置登録要求を送信して拒否された場合に、一定時間の間、位置登録要求を再送しない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 system according to claim 1, wherein the mobile station does not retransmit the location registration request for a certain period of time when the location registration request is transmitted to the indoor base station and is rejected. 前記移動局は、同一の屋内基地局に位置登録している他の移動局とデータ通信することを許可する手段を備えることを特徴とする請求項１または２に記載の無線通信システム。   The wireless communication system according to claim 1 or 2, wherein the mobile station comprises means for permitting data communication with another mobile station whose location is registered in the same indoor base station. 前記屋内基地局に接続され、該屋内基地局の記憶手段に登録された移動局識別子および該屋内基地局に位置登録している移動局識別子および位置登録要求を受信したが前記記憶手段に登録されていないために位置登録要求拒否を送信した移動局識別子を該屋内基地局から取得して表示する表示装置をさらに備え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 mobile station identifier connected to the indoor base station and registered in the storage means of the indoor base station and the mobile station identifier registered in the indoor base station and the location registration request are received but registered in the storage means The wireless communication system according to claim 2, further comprising a display device that acquires and displays the mobile station identifier that has transmitted the location registration request rejection because of not being received from the indoor base station. 移動局との間の伝播損失値が所定値より小さい場合に該移動局の接続を許可する手段を備えることを特徴とする屋内基地局。   An indoor base station comprising means for permitting connection of a mobile station when a propagation loss value with the mobile station is smaller than a predetermined value.
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