JP5411068B2 - Wireless terminal device and connection destination switching method - Google Patents

Wireless terminal device and connection destination switching method Download PDF

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JP5411068B2
JP5411068B2 JP2010140586A JP2010140586A JP5411068B2 JP 5411068 B2 JP5411068 B2 JP 5411068B2 JP 2010140586 A JP2010140586 A JP 2010140586A JP 2010140586 A JP2010140586 A JP 2010140586A JP 5411068 B2 JP5411068 B2 JP 5411068B2
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communication network
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terminal device
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wireless terminal
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弘貴 吉岡
大樹 柴山
武 鬼沢
宏之 中村
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Nippon Telegraph and Telephone Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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本発明は、消費電力を抑えつつ、第１の通信網と第２の通信網（例えば無線ＬＡＮと携帯電話網）との間で接続先切替を行う無線端末装置および接続先切替方法に関する。   The present invention relates to a wireless terminal device and a connection destination switching method that perform connection destination switching between a first communication network and a second communication network (for example, a wireless LAN and a mobile phone network) while suppressing power consumption.

携帯電話網と無線ＬＡＮを比較した場合、一般的に携帯電話網はカバーエリアが広いが通信速度が遅く、無線ＬＡＮはカバーエリアが狭いが通信速度が速いという特徴がある。そこで、携帯電話網と無線ＬＡＮのそれぞれの長所を活かせる無線端末装置として、携帯電話網と無線ＬＡＮの双方に接続できる２つのインタフェース（ＩＦ）を備え、通信品質の良い方を選択して接続する装置が製品化されている。   When comparing a cellular phone network and a wireless LAN, the cellular phone network generally has a wide coverage area but a low communication speed, and a wireless LAN has a feature that the communication area is narrow but the communication speed is high. Therefore, as a wireless terminal device that can take advantage of the advantages of both the mobile phone network and the wireless LAN, it has two interfaces (IF) that can be connected to both the mobile phone network and the wireless LAN. The device to be commercialized has been commercialized.

ここで、携帯電話網と無線ＬＡＮの接続先切替方法として、常に両方のＩＦをアクティブにしておき、受信レベル等の通信品質を常に監視して通信品質の良い方を選択する方法がある。この方法では常に通信品質を監視しているため、通信品質の変化に合わせて素早く接続先切替（ハンドオーバ）を行うことができるが、常に両方のＩＦがアクティブになっているため消費電力が大きい。そこで消費電力を抑えるため、使用していないＩＦはスリープ状態にし、一定間隔でアクティブにして通信品質を監視をする方法がある。しかし、この方法は先の方法に比べ消費電力を抑えることはできるが、スリープ期間が長ければ接続先切替に時間を要する。   Here, there is a method of switching both connection destinations between the mobile phone network and the wireless LAN by always activating both IFs and constantly monitoring the communication quality such as the reception level and selecting the one with the better communication quality. In this method, since the communication quality is constantly monitored, connection destination switching (handover) can be quickly performed in accordance with the change in communication quality, but power consumption is large because both IFs are always active. In order to reduce power consumption, there is a method in which unused IFs are put in a sleep state and are activated at regular intervals to monitor communication quality. However, this method can reduce power consumption compared to the previous method, but if the sleep period is long, it takes time to switch the connection destination.

そこで消費電力を抑えつつ、接続先切替を素早く行う方法として特許文献１が提案されている。この方法では、無線ＬＡＮのエリア情報を携帯電話網基地局と関連付けて無線端末装置に登録しておき、無線端末装置が携帯電話網基地局に接続した際に携帯電話網エリア内に無線ＬＡＮエリアが存在する場合のみ無線ＬＡＮ基地局のサーチを行うことで消費電力を抑えることができる。しかし、一般的に携帯電話網エリアは無線ＬＡＮエリアより広いため、携帯電話網エリアのどこかに無線ＬＡＮエリアが存在すると判断したとしても、必ずしも無線端末装置が無線ＬＡＮエリア内にいるとは限らず、無線ＬＡＮ基地局をサーチしても無線ＬＡＮエリアが見つからない可能性もある。このため、無線ＬＡＮ基地局のサーチ精度が低くなり、接続先切替に時間を要することになる。   Therefore, Patent Document 1 has been proposed as a method for quickly switching connection destinations while suppressing power consumption. In this method, wireless LAN area information is associated with a mobile phone network base station and registered in the wireless terminal device, and when the wireless terminal device is connected to the mobile phone network base station, the wireless LAN area is included in the mobile phone network area. Power consumption can be suppressed by searching for a wireless LAN base station only when there is. However, since the cellular phone network area is generally larger than the wireless LAN area, even if it is determined that the wireless LAN area exists somewhere in the cellular phone network area, the wireless terminal device is not necessarily in the wireless LAN area. In addition, there is a possibility that the wireless LAN area cannot be found even if the wireless LAN base station is searched. For this reason, the search accuracy of the wireless LAN base station is lowered, and it takes time to switch the connection destination.

特開２００８−３０１０５８号公報JP 2008-301058 A

携帯電話網と無線ＬＡＮに接続可能な２つのＩＦを備えた従来の無線端末装置は、携帯電話網エリア内にあっても無線ＬＡＮエリアを正確に把握することができないため、当該携帯電話網エリア内では常に無線ＬＡＮ基地局をサーチする必要があり、消費電力の低減効果は限定されていた。   A conventional wireless terminal device having two IFs that can be connected to a mobile phone network and a wireless LAN cannot accurately grasp the wireless LAN area even within the mobile phone network area. It is necessary to always search for a wireless LAN base station within the network, and the power consumption reduction effect is limited.

本発明は、消費電力を抑えつつ、第１の通信網と第２の通信網（例えば無線ＬＡＮと携帯電話網）との間で接続先切替を素早く行うことができる無線端末装置および接続先切替方法を提供することを目的とする。   The present invention relates to a wireless terminal device and a connection destination switching capable of quickly switching a connection destination between a first communication network and a second communication network (for example, a wireless LAN and a mobile phone network) while suppressing power consumption. It aims to provide a method.

第１の発明は、第２の通信網のエリア内に第１の通信網のエリアが局所的に存在するような包含関係または隣接関係にある第１の通信網と第２の通信網に接続可能な複数のインタフェース部と、第１の通信網の通信品質と第２の通信網の通信品質を比較し、通信品質が良好な通信網と接続する接続先選択手段とを備えた無線端末装置において、第２の通信網に接続中に第１の通信網に接続するインタフェース部をスリープ状態に設定し、第１の通信網に接続中に第２の通信網に接続するインタフェース部をスリープ状態に設定するスリープ制御手段と、第１の通信網のエリア情報を格納するエリア情報格納手段と、無線端末装置の現在位置と移動速度および移動方向から得られる無線端末装置の位置情報と第１の通信網のエリア情報を照合し、第２の通信網に接続中には、無線端末装置が第１の通信網のエリアに近づいていることを検知し、第１の通信網に接続中には、無線端末装置が第１の通信網のエリア外に近づいていることを検知する端末位置判定手段とを備え、接続先選択手段は、端末位置判定手段で第２の通信網に接続中の無線端末装置が第１の通信網のエリアに近づいていることを検知したときに、第１の通信網に接続するインタフェース部をスリープ状態からアクティブ状態にして通信品質を監視し、第１の通信網の通信品質が第２の通信網の通信品質より良い場合に、接続先を第２の通信網から第１の通信網に切り替え、端末位置判定手段で第１の通信網に接続中の無線端末装置が第１の通信網のエリア外に近づいていることを検知したときに、第２の通信網に接続するインタフェース部をスリープ状態からアクティブ状態にして通信品質を監視し、第２の通信網の通信品質が第１の通信網の通信品質より良い場合に、接続先を第１の通信網から第２の通信網に切り替える構成である。 The first invention is connected to the first communication network and the second communication network that are in an inclusive relationship or adjacent relationship such that the area of the first communication network exists locally within the area of the second communication network. A wireless terminal device comprising: a plurality of possible interface units; and a connection destination selection unit that compares the communication quality of the first communication network and the communication quality of the second communication network and connects to a communication network with good communication quality The interface unit connected to the first communication network is set to the sleep state while connected to the second communication network, and the interface unit connected to the second communication network is set to the sleep state while connected to the first communication network. Sleep control means for setting the area information, area information storage means for storing area information of the first communication network, position information of the wireless terminal device obtained from the current position and moving speed and moving direction of the wireless terminal device, and the first Check the network area information During connection to the second communication network, it detects that the wireless terminal device is approaching the area of the first communication network, during the connection to the first communication network, the wireless terminal device first communication Terminal position determining means for detecting approaching outside the area of the network, and the connection destination selecting means is configured so that the wireless terminal device connected to the second communication network by the terminal position determining means is connected to the first communication network. When it is detected that an area is approaching, the interface unit connected to the first communication network is changed from the sleep state to the active state to monitor the communication quality, and the communication quality of the first communication network is the second communication network. If the communication quality is better than the first communication network, the connection destination is switched from the second communication network to the first communication network, and the wireless terminal device connected to the first communication network by the terminal position determination means is the area of the first communication network. When it detects that it is approaching outside, it connects to the second communication network. When the communication quality of the second communication network is better than the communication quality of the first communication network, the connection destination is changed from the first communication network to the second communication interface. is a toggle its configuration of the communication network.

第１の発明の無線端末装置において、エリア情報格納手段に代えて、第１の通信網のエリア情報を管理するネットワーク上のサーバにアクセスして第１の通信網のエリア情報を取得するエリア情報取得手段を備えてもよい。   In the wireless terminal device of the first invention, instead of the area information storage means, area information for obtaining area information of the first communication network by accessing a server on the network managing the area information of the first communication network Acquisition means may be provided.

第１の発明の無線端末装置において、第１の通信網は無線ＬＡＮであり、第２の通信網は携帯電話網である。   In the wireless terminal device of the first invention, the first communication network is a wireless LAN, and the second communication network is a mobile phone network.

第２の発明は、第２の通信網のエリア内に第１の通信網のエリアが局所的に存在するような包含関係または隣接関係にある第１の通信網と第２の通信網に接続可能な複数のインタフェース部を備え、接続先選択手段で、第１の通信網の通信品質と第２の通信網の通信品質を比較し、通信品質が良好な通信網と接続する無線端末装置の接続先切替方法において、スリープ制御手段を用いて、第２の通信網に接続中に第１の通信網に接続するインタフェース部をスリープ状態に設定し、第１の通信網に接続中に第２の通信網に接続するインタフェース部をスリープ状態に設定し、エリア情報格納手段に第１の通信網のエリア情報を格納し、端末位置判定手段を用いて、無線端末装置の現在位置と移動速度および移動方向から得られる無線端末装置の位置情報と第１の通信網のエリア情報を照合し、第２の通信網に接続中には、無線端末装置が第１の通信網のエリアに近づいていることを検知し、第１の通信網に接続中には、無線端末装置が第１の通信網のエリア外に近づいていることを検知し、接続先選択手段は、端末位置判定手段で第２の通信網に接続中の無線端末装置が第１の通信網のエリアに近づいていることを検知したときに、第１の通信網に接続するインタフェース部をスリープ状態からアクティブ状態にして通信品質を監視し、第１の通信網の通信品質が第２の通信網の通信品質より良い場合に、接続先を第２の通信網から第１の通信網に切り替え、端末位置判定手段で第１の通信網に接続中の無線端末装置が第１の通信網のエリア外に近づいていることを検知したときに、第２の通信網に接続するインタフェース部をスリープ状態からアクティブ状態にして通信品質を監視し、第２の通信網の通信品質が第１の通信網の通信品質より良い場合に、接続先を第１の通信網から第２の通信網に切り替える。 The second invention is connected to the first communication network and the second communication network that are in an inclusive relationship or adjacent relationship such that the area of the first communication network exists locally within the area of the second communication network. A wireless terminal device comprising a plurality of possible interface units, comparing the communication quality of the first communication network and the communication quality of the second communication network by the connection destination selection means, and connecting to a communication network with good communication quality In the connection destination switching method, the sleep control means is used to set the interface unit connected to the first communication network to the sleep state while connected to the second communication network, and to the second while connected to the first communication network. The interface unit connected to the communication network is set to the sleep state, the area information storage unit stores the area information of the first communication network, and the terminal position determination unit is used to Wireless terminal device obtained from moving direction Collating the positional information and area information of the first communication network, during the connection to the second communication network, it detects that the wireless terminal device is approaching the area of the first communication network, a first communication While connected to the network, it is detected that the wireless terminal device is approaching the outside of the area of the first communication network, and the connection destination selecting means is a wireless terminal connected to the second communication network by the terminal position determining means. When it is detected that the device is approaching the area of the first communication network, the interface unit connected to the first communication network is changed from the sleep state to the active state, and the communication quality is monitored. When the communication quality is better than the communication quality of the second communication network, the connection destination is switched from the second communication network to the first communication network, and the wireless terminal device being connected to the first communication network by the terminal position determination unit When it detects that it is approaching outside the area of the first communication network The interface unit connected to the second communication network is changed from the sleep state to the active state to monitor the communication quality, and when the communication quality of the second communication network is better than the communication quality of the first communication network, the connection destination is Ru switch from one communication network to a second communication network.

第２の発明の無線端末装置の接続先切替方法において、エリア情報格納手段に代えて、第１の通信網のエリア情報を管理するネットワーク上のサーバにアクセスして第１の通信網のエリア情報を取得するようにしてもよい。   In the wireless terminal device connection destination switching method according to the second invention, instead of the area information storage means, a server on the network that manages the area information of the first communication network is accessed to access the area information of the first communication network. May be obtained.

第２の発明の無線端末装置の接続先切替方法において、第１の通信網は無線ＬＡＮであり、第２の通信網は携帯電話網である。   In the connection destination switching method of the wireless terminal device according to the second aspect of the invention, the first communication network is a wireless LAN, and the second communication network is a mobile phone network.

本発明は、携帯電話網に接続中の無線端末装置が無線ＬＡＮエリアに近づいたときのみ無線ＬＡＮに接続するインタフェース部をアクティブにし、携帯電話網と無線ＬＡＮの通信品質を比較して良好な方に接続することにより、消費電力を抑えつつ携帯電話網から無線ＬＡＮへの接続先切替を素早く行うことができる。   The present invention activates an interface unit connected to a wireless LAN only when a wireless terminal device connected to the mobile phone network approaches the wireless LAN area, and compares the communication quality between the mobile phone network and the wireless LAN. By connecting to, it is possible to quickly switch the connection destination from the cellular phone network to the wireless LAN while suppressing power consumption.

また、本発明は、無線ＬＡＮに接続中の無線端末装置が無線ＬＡＮエリア外に近づいたときのみ携帯電話網に接続するインタフェース部をアクティブにし、携帯電話網と無線ＬＡＮの通信品質を比較して良好な方に接続することにより、消費電力を抑えつつ無線ＬＡＮから携帯電話網への接続先切替を素早く行うことができる。   Further, the present invention activates an interface unit that connects to a mobile phone network only when a wireless terminal device connected to the wireless LAN approaches the outside of the wireless LAN area, and compares the communication quality of the mobile phone network and the wireless LAN. By connecting to the better one, it is possible to quickly switch the connection destination from the wireless LAN to the mobile phone network while reducing power consumption.

本発明の概要を示す図である。It is a figure which shows the outline | summary of this invention. 本発明の接続先切替方法の実施例１の処理手順を示すフローチャートである。It is a flowchart which shows the process sequence of Example 1 of the connection destination switching method of this invention. 本発明の接続先切替方法の実施例１の処理手順（変形例）を示すフローチャートである。It is a flowchart which shows the process sequence (modification) of Example 1 of the connection destination switching method of this invention. 本発明の接続先切替方法の実施例１に対応する無線端末装置の構成例を示す図である。It is a figure which shows the structural example of the radio | wireless terminal apparatus corresponding to Example 1 of the connection destination switching method of this invention. 本発明の接続先切替方法の実施例２の処理手順を示すフローチャートである。It is a flowchart which shows the process sequence of Example 2 of the connection destination switching method of this invention. 本発明の接続先切替方法の実施例２に対応する無線端末装置の構成例を示す図である。It is a figure which shows the structural example of the radio | wireless terminal apparatus corresponding to Example 2 of the connection destination switching method of this invention.

図１は、本発明の概要を示す。
図１において、携帯電話網エリア内に無線ＬＡＮエリアが局所的に存在しており、無線端末装置（以下「端末」という）は、携帯電話網のみに接続できる位置Ａ、無線ＬＡＮに接続できる位置Ｂ、携帯電話網のみに接続できる位置Ｃを移動するものとする。ここで、ＡＰは無線ＬＡＮ基地局、ＢＳは携帯電話網基地局を示す。 FIG. 1 shows an overview of the present invention.
In FIG. 1, a wireless LAN area locally exists in the mobile phone network area, and a wireless terminal device (hereinafter referred to as “terminal”) can be connected to only the mobile phone network, and can be connected to the wireless LAN. B, a position C that can be connected only to the mobile phone network is moved. Here, AP indicates a wireless LAN base station, and BS indicates a mobile phone network base station.

図２は、本発明の接続先切替方法の実施例１の処理手順を示す。以下、図１および図２を参照して実施例１の処理手順について説明する。   FIG. 2 shows a processing procedure of the first embodiment of the connection destination switching method of the present invention. Hereinafter, the processing procedure of the first embodiment will be described with reference to FIGS. 1 and 2.

端末は、携帯電話網と無線ＬＡＮに接続できる２つのＩＦを持ち、携帯電話網と無線ＬＡＮのいずれかを選択して接続する。また、端末は、無線ＬＡＮエリア情報を予め登録している（Ｓ１）。いま、位置Ａにいる端末は携帯電話網に接続し、無線ＬＡＮ−ＩＦはスリープ状態にあり（Ｓ２）、消費電力が非常に少ない状態である。   The terminal has two IFs that can be connected to the mobile phone network and the wireless LAN, and selects and connects either the mobile phone network or the wireless LAN. The terminal registers wireless LAN area information in advance (S1). Now, the terminal at position A is connected to the mobile phone network, the wireless LAN-IF is in the sleep state (S2), and the power consumption is very low.

端末が位置Ａから位置Ｂへ向って移動し、無線ＬＡＮエリアに近づいていったとする。端末は、ＧＰＳで自端末の現在位置を把握し、また加速度センサにより移動方向および移動速度を把握する（Ｓ３）。端末は、ＧＰＳおよび加速度センサで把握した自端末の位置情報と、予め登録している無線ＬＡＮエリア情報とを照合し、自端末が無線ＬＡＮエリアに近づいているか否かを判定する（Ｓ４）。端末が無線ＬＡＮエリアに近づいていることを検知した場合、端末は無線ＬＡＮ−ＩＦをアクティブにして通信品質の監視を行う（Ｓ５）。そして得られた無線ＬＡＮの通信品質と、元々接続している携帯電話網の通信品質を端末内で比較し（Ｓ６）、より通信品質の良い方へ接続を行う（Ｓ７）。ここで、無線ＬＡＮの通信品質が携帯電話網よりも良好であれば、携帯電話網から無線ＬＡＮへの接続切替が行われ（Ｓ８）、携帯電話網の通信品質の方が良好であれば、そのまま携帯電話網との接続を継続し、ステップＳ３の端末の位置情報の把握に戻る。   Assume that the terminal moves from position A toward position B and approaches the wireless LAN area. The terminal grasps the current position of the terminal by GPS, and grasps the moving direction and moving speed by the acceleration sensor (S3). The terminal collates the position information of the own terminal grasped by the GPS and the acceleration sensor and the wireless LAN area information registered in advance, and determines whether or not the own terminal is approaching the wireless LAN area (S4). When it is detected that the terminal is approaching the wireless LAN area, the terminal activates the wireless LAN-IF and monitors the communication quality (S5). Then, the communication quality of the obtained wireless LAN and the communication quality of the originally connected mobile phone network are compared in the terminal (S6), and the connection with the better communication quality is made (S7). Here, if the communication quality of the wireless LAN is better than that of the mobile phone network, connection switching from the mobile phone network to the wireless LAN is performed (S8), and if the communication quality of the mobile phone network is better, The connection with the mobile phone network is continued as it is, and the process returns to grasping the location information of the terminal in step S3.

これにより、常時無線ＬＡＮ−ＩＦをアクティブにして通信品質の監視を行う方法に比べ、端末が無線ＬＡＮエリアに近づいたときのみ無線ＬＡＮ−ＩＦをアクティブにすればよいため消費電力を抑えることができる。また、無線ＬＡＮエリアに入る前から無線ＬＡＮの通信品質監視を開始するため、無線ＬＡＮの通信品質が良くなったときに瞬時に携帯電話網から無線ＬＡＮに切替可能である。   As a result, power consumption can be reduced because the wireless LAN-IF only needs to be activated only when the terminal approaches the wireless LAN area, compared to a method in which the wireless LAN-IF is always active to monitor the communication quality. . Since the wireless LAN communication quality monitoring is started before entering the wireless LAN area, when the wireless LAN communication quality is improved, the mobile phone network can be instantaneously switched to the wireless LAN.

端末は、無線ＬＡＮエリア内の位置Ｂで、携帯電話網より通信品質のよい無線ＬＡＮに接続し（Ｓ８）、定期的に携帯電話網の通信品質監視を行う（Ｓ９）。さらに、無線ＬＡＮの通信品質と携帯電話網の通信品質を端末内で比較し（Ｓ10）、より通信品質の良い網へ接続を行う（Ｓ11）。ここで、端末は、無線ＬＡＮより携帯電話網のほうが通信品質が良い位置Ｃへ移動し、無線ＬＡＮよりも携帯電話網の通信品質が良いと判定すると、接続先を携帯電話網へ切り替える（Ｓ12）。端末は、携帯電話網ＩＦに切り替えた後は無線ＬＡＮ−ＩＦをスリープ状態に設定し（Ｓ２）、消費電力を抑える。以下、ステップＳ２以降の処理を繰り返す。また、端末が無線ＬＡＮに接続している状態であれば、ステップＳ８から接続先切替の処理手順が開始される。   The terminal connects to a wireless LAN with better communication quality than the mobile phone network at position B in the wireless LAN area (S8), and periodically monitors the communication quality of the mobile phone network (S9). Further, the communication quality of the wireless LAN and the communication quality of the mobile phone network are compared in the terminal (S10), and a connection to a network with better communication quality is made (S11). Here, if the terminal moves to the position C where the communication quality of the mobile phone network is better than that of the wireless LAN and determines that the communication quality of the mobile phone network is better than that of the wireless LAN, the terminal switches to the mobile phone network (S12). ). After switching to the mobile phone network IF, the terminal sets the wireless LAN-IF to the sleep state (S2) and suppresses power consumption. Thereafter, the processing after step S2 is repeated. If the terminal is connected to the wireless LAN, the connection destination switching procedure is started from step S8.

なお、端末は、無線ＬＡＮに接続中においても、無線ＬＡＮエリア情報とＧＰＳおよび加速度センサで得た自端末の位置情報を用いることにより、自端末が無線ＬＡＮエリア外に近づいているか否かを判定するようにしてもよい。この場合、端末はステップＳ９のように定期的に携帯電話網の通信品質監視を行わず、図３に示すステップＳ21〜Ｓ24のように、携帯電話網−ＩＦをスリープ状態に設定して消費電力を抑え、無線ＬＡＮエリア外に近づいたときに携帯電話網−ＩＦをアクティブにして携帯電話網の通信品質監視を行ってもよい。   Even when the terminal is connected to the wireless LAN, the terminal determines whether or not the terminal is approaching the outside of the wireless LAN area by using the wireless LAN area information and the position information of the terminal obtained by the GPS and the acceleration sensor. You may make it do. In this case, the terminal does not regularly monitor the communication quality of the mobile phone network as in step S9, but sets the mobile phone network-IF to the sleep state as in steps S21 to S24 shown in FIG. The mobile phone network IF may be activated when the mobile phone network approaches the outside of the wireless LAN area, and the communication quality of the mobile phone network may be monitored.

以上の方法により、消費電力を抑えつつ携帯電話網と無線ＬＡＮの接続先切替を高速に行うことが可能となる。   With the above method, it is possible to switch the connection destination between the mobile phone network and the wireless LAN at high speed while suppressing power consumption.

また、無線ＬＡＮの通信品質と携帯電話網の通信品質を比較する代わりに、無線ＬＡＮの受信レベルが所定値を超えたときに携帯電話網から無線ＬＡＮに切り替え、無線ＬＡＮの受信レベルが所定値以下になったときに無線ＬＡＮから携帯電話網に切り替えを行うようにしてもよい。   Further, instead of comparing the communication quality of the wireless LAN and the communication quality of the mobile phone network, when the reception level of the wireless LAN exceeds a predetermined value, the mobile phone network is switched to the wireless LAN, and the reception level of the wireless LAN is a predetermined value. You may make it switch from a wireless LAN to a mobile telephone network when it becomes below.

図４は、本発明の接続先切替方法の実施例１に対応する無線端末装置の構成例を示す。
図４において、端末は、携帯電話網−ＩＦ１１および無線ＬＡＮ−ＩＦ１２を備え、通信制御部１３を介して通信品質測定部１４で携帯電話網と無線ＬＡＮの通信品質が測定され、接続先判定部１５で通品品質の良い方が選択される。また、無線ＬＡＮのエリア情報を格納する無線ＬＡＮエリア情報格納部１６を備える。端末位置把握部１７は、ＧＰＳ１８および加速度センサ１９から自端末の現在位置、移動方向、移動速度の位置情報を取得する。端末位置判定部２０は、無線ＬＡＮエリア情報格納部１６に格納されている無線ＬＡＮのエリア情報と、端末位置把握部１７で取得した自端末の位置情報に基づき、自端末が無線ＬＡＮエリアに近づいているか否か、あるいは自端末が無線ＬＡＮエリア外に近づいているか否かを判定する。 FIG. 4 shows a configuration example of a wireless terminal device corresponding to the first embodiment of the connection destination switching method of the present invention.
In FIG. 4, the terminal includes a mobile phone network-IF 11 and a wireless LAN-IF 12, the communication quality measurement unit 14 measures the communication quality between the mobile phone network and the wireless LAN via the communication control unit 13, and the connection destination determination unit At 15, the one with the better quality is selected. In addition, a wireless LAN area information storage unit 16 for storing wireless LAN area information is provided. The terminal position grasping unit 17 acquires position information on the current position, moving direction, and moving speed of the terminal from the GPS 18 and the acceleration sensor 19. Based on the wireless LAN area information stored in the wireless LAN area information storage unit 16 and the location information of the own terminal acquired by the terminal location grasping unit 17, the terminal location determination unit 20 approaches the wireless LAN area. It is determined whether or not the terminal is approaching outside the wireless LAN area.

なお、請求項１，２，５，６に示す各部は、次のように対応する。インタフェース部は、携帯電話網−ＩＦ１１および無線ＬＡＮ−ＩＦ１２に対応する。接続先選択手段は、通信制御部１３、通信品質測定部１４および接続先判定部１５に対応する。スリープ制御手段は、通信制御部１３に対応する。エリア情報格納手段は、無線ＬＡＮエリア情報格納部１６に対応する。端末位置判定手段は、端末位置把握部１７、ＧＰＳ１８、加速度センサ１９、端末位置判定部２０に対応する。   In addition, each part shown to Claim 1, 2, 5, 6 respond | corresponds as follows. The interface unit corresponds to the mobile phone network-IF 11 and the wireless LAN-IF 12. The connection destination selection unit corresponds to the communication control unit 13, the communication quality measurement unit 14, and the connection destination determination unit 15. The sleep control unit corresponds to the communication control unit 13. The area information storage means corresponds to the wireless LAN area information storage unit 16. The terminal position determination unit corresponds to the terminal position determination unit 17, the GPS 18, the acceleration sensor 19, and the terminal position determination unit 20.

ここで、端末が無線ＬＡＮエリアに近づいていることを検知した場合、無線ＬＡＮエリア近接判定部２０から通信制御部１３を介して無線ＬＡＮ−ＩＦ１２をアクティブにし、通信品質測定部１４で無線ＬＡＮの通信品質の監視を行う。そして得られた無線ＬＡＮの通信品質と、元々接続している携帯電話網の通信品質を接続先判定部１５で比較し、より通信品質の良い方へ接続を行う。これにより、無線ＬＡＮ−ＩＦ１２を常時アクティブにして通信品質の監視を行う方法に比べ、端末が無線ＬＡＮエリアに近づいたときのみ無線ＬＡＮ−ＩＦ１２をアクティブにすればよいため、消費電力を抑えることができる。   Here, when it is detected that the terminal is approaching the wireless LAN area, the wireless LAN-IF 12 is activated from the wireless LAN area proximity determination unit 20 via the communication control unit 13, and the communication quality measurement unit 14 determines the wireless LAN area. Monitor communication quality. Then, the communication quality of the obtained wireless LAN and the communication quality of the originally connected mobile phone network are compared by the connection destination determination unit 15, and the connection with the better communication quality is performed. As a result, compared with a method of monitoring the communication quality by always making the wireless LAN-IF 12 active, it is only necessary to activate the wireless LAN-IF 12 only when the terminal approaches the wireless LAN area, thereby reducing power consumption. it can.

また、無線ＬＡＮエリアに入る前から無線ＬＡＮの通信品質監視を開始するため、無線ＬＡＮの通信品質が良くなったときに瞬時に携帯電話網−ＩＦ１１から無線ＬＡＮ−ＩＦ１２に切替可能である。   Since the wireless LAN communication quality monitoring is started before entering the wireless LAN area, when the wireless LAN communication quality is improved, the mobile phone network-IF 11 can be instantaneously switched to the wireless LAN-IF 12.

また、無線ＬＡＮ接続中は、定期的に携帯電話網−ＩＦ１１をアクティブにし、通信品質測定部１４で通信品質監視を行う。ここで、無線ＬＡＮより携帯電話網のほうが通信品質が良い位置Ｃへ移動すると、接続先判定部１５で無線ＬＡＮよりも携帯電話網の通信品質が良いと判定され、接続先を携帯電話網へ切り替える。携帯電話網−ＩＦ１１に切り替えた後は、無線ＬＡＮ−ＩＦ１２はスリープ状態に入り、消費電力を抑える。   Further, during the wireless LAN connection, the cellular phone network-IF 11 is periodically activated, and the communication quality measuring unit 14 performs communication quality monitoring. Here, if the mobile phone network moves to the position C where the communication quality is better than that of the wireless LAN, the connection destination determination unit 15 determines that the communication quality of the mobile phone network is better than the wireless LAN, and the connection destination is transferred to the mobile phone network. Switch. After switching to the cellular phone network-IF11, the wireless LAN-IF12 enters a sleep state and suppresses power consumption.

また、端末は、無線ＬＡＮに接続中においても、無線ＬＡＮエリア情報とＧＰＳや加速度センサで得た自端末の位置情報を用いることにより、自端末が無線ＬＡＮエリア外に近づいているか否かを判定するようにしてもよい。この場合、端末は定期的に携帯電話網の通信品質監視を行わず、携帯電話網−ＩＦ１１をスリープ状態に設定して消費電力を抑えつつ、端末位置判定部２０で無線ＬＡＮエリア外に近づいたことを検知したときに、携帯電話網−ＩＦ１１をアクティブにし、携帯電話網の通信品質監視を行ってもよい。   Further, even when the terminal is connected to the wireless LAN, the terminal determines whether or not the terminal is approaching the outside of the wireless LAN area by using the wireless LAN area information and the position information of the terminal obtained by GPS or an acceleration sensor. You may make it do. In this case, the terminal does not regularly monitor the communication quality of the mobile phone network, and the mobile phone network-IF 11 is set to the sleep state to reduce power consumption, while the terminal position determination unit 20 approaches the outside of the wireless LAN area. When this is detected, the mobile phone network-IF 11 may be activated to monitor the communication quality of the mobile phone network.

図５は、本発明の接続先切替方法の実施例２の処理手順を示す。
図６は、本発明の接続先切替方法の実施例２に対応する無線端末装置の構成例を示す。
以下、図１、図５および図６を参照して実施例２の処理手順および無線端末装置の構成について説明する。 FIG. 5 shows a processing procedure of the second embodiment of the connection destination switching method of the present invention.
FIG. 6 shows a configuration example of a wireless terminal device corresponding to the second embodiment of the connection destination switching method of the present invention.
Hereinafter, the processing procedure of the second embodiment and the configuration of the wireless terminal device will be described with reference to FIG. 1, FIG. 5, and FIG.

実施例１では、無線ＬＡＮのエリア情報は予め端末内の無線ＬＡＮエリア情報格納部１６に格納されている。端末位置判定部２０は、無線ＬＡＮエリア情報格納部１６に格納されている無線ＬＡＮのエリア情報と、端末位置把握部１７で取得した自端末の位置情報に基づき、自端末が無線ＬＡＮエリアに近づいているか否か、あるいは無線ＬＡＮエリア外に近づいているか否かを判定する。   In the first embodiment, wireless LAN area information is stored in advance in the wireless LAN area information storage unit 16 in the terminal. Based on the wireless LAN area information stored in the wireless LAN area information storage unit 16 and the location information of the own terminal acquired by the terminal location grasping unit 17, the terminal location determination unit 20 approaches the wireless LAN area. It is determined whether or not the wireless LAN area is approaching.

実施例２は、無線ＬＡＮのエリア情報を端末内ではなく、ネットワーク上のサーバに記録されており（Ｓ31）、端末は無線ＬＡＮエリア情報格納部１６に代えてサーバアクセス部２１を備える。端末は、ＧＰＳで自端末の現在位置を把握し、また加速度センサにより移動方向や移動速度を把握し（Ｓ３）、ネットワーク上のサーバにアクセスして無線ＬＡＮエリア情報を取得する（Ｓ32）。端末は、ＧＰＳや加速度センサで把握した自端末の位置情報と、ネットワークから取得した無線ＬＡＮエリア情報とを照合し、自端末が無線ＬＡＮエリアに近づいているか否かを判定する（Ｓ４）。判定後の通信品質の比較方法やＩＦの切替方法は実施例１と同じである。なお、請求項３に示すエリア情報取得手段は、サーバアクセス部２１に対応する。   In the second embodiment, the wireless LAN area information is recorded not in the terminal but in a server on the network (S31), and the terminal includes a server access unit 21 instead of the wireless LAN area information storage unit 16. The terminal grasps the current position of the terminal by GPS, grasps the moving direction and moving speed by an acceleration sensor (S3), and accesses a server on the network to acquire wireless LAN area information (S32). The terminal collates the position information of the own terminal grasped by the GPS or the acceleration sensor with the wireless LAN area information acquired from the network, and determines whether or not the own terminal is approaching the wireless LAN area (S4). The communication quality comparison method and IF switching method after determination are the same as those in the first embodiment. Note that the area information acquisition unit described in claim 3 corresponds to the server access unit 21.

無線ＬＡＮエリア情報はデータ量が多くなるため、実施例１では端末内に無線ＬＡＮエリア情報を記録するためのデータ領域（無線ＬＡＮエリア情報格納部１６）の確保が必要であり、また無線ＬＡＮエリア情報の書込みに時間を要する。実施例２では、無線ＬＡＮエリア情報がネットワーク上のサーバに記録されているため、端末内に無線ＬＡＮエリア情報を記録するためのデータ領域の確保は不要であり、端末のストレージ容量を削減することができる。また、無線ＬＡＮエリア情報の書込みも不要であるため、書込みの手間や時間を省くことができる。さらに、無線ＬＡＮエリア情報に変更があった場合（基地局の増設によるエリア拡大など) 、実施例１では更新された無線ＬＡＮエリア情報を端末に書き込むまでエリア情報の更新が行われないが、実施例２では無線ＬＡＮエリア情報がサーバ上でリアルタイムに情報が更新されるため、常に最新の無線ＬＡＮエリア情報を用いて判定を行うことができ、判定精度の向上が見込める。   Since the data amount of the wireless LAN area information increases, in the first embodiment, it is necessary to secure a data area (wireless LAN area information storage unit 16) for recording the wireless LAN area information in the terminal, and the wireless LAN area. It takes time to write information. In the second embodiment, since wireless LAN area information is recorded on a server on the network, it is not necessary to secure a data area for recording the wireless LAN area information in the terminal, and the storage capacity of the terminal is reduced. Can do. Further, since it is not necessary to write the wireless LAN area information, it is possible to save time and time for writing. Further, when there is a change in the wireless LAN area information (such as area expansion by adding a base station), the area information is not updated until the updated wireless LAN area information is written in the terminal in the first embodiment. In Example 2, since the wireless LAN area information is updated on the server in real time, the determination can always be performed using the latest wireless LAN area information, and the determination accuracy can be improved.

さらに、端末で行った携帯電話網と無線ＬＡＮの通信品質の監視結果をサーバにフィードバックすることで、ある位置における携帯電話網と無線ＬＡＮの通信品質をサーバ上で管理し、無線ＬＡＮのエリア情報を更新することできる。これにより、複数端末による様々な位置での通信品質の監視結果をサーバに蓄積していくことで、無線ＬＡＮエリア情報の精度を自動的に向上していくことが可能である。   Further, by feeding back to the server the monitoring results of the communication quality of the mobile phone network and the wireless LAN performed by the terminal, the communication quality of the mobile phone network and the wireless LAN at a certain position is managed on the server, and the wireless LAN area information Can be updated. Thereby, it is possible to automatically improve the accuracy of the wireless LAN area information by accumulating the monitoring results of the communication quality at various positions by a plurality of terminals in the server.

なお、サーバアクセス部２１およびステップＳ32の処理では、実施例１で無線ＬＡＮエリア情報格納部１６に格納していた無線ＬＡＮエリア情報の全てをダウンロードせず、自端末の周辺における無線ＬＡＮエリア情報をダウンロードするようにして、ダウンロードにかかる負荷を軽減するようにしてもよい。   In the server access unit 21 and the process of step S32, all of the wireless LAN area information stored in the wireless LAN area information storage unit 16 in the first embodiment is not downloaded, and the wireless LAN area information in the vicinity of the own terminal is not downloaded. Downloading may be performed to reduce the load on downloading.

また、実施例１および実施例２では、携帯電話網と無線ＬＡＮの接続先切替について説明したが、携帯電話網や無線ＬＡＮ以外のＷｉＭＡＸやＰＨＳ等の無線システムにおいても同様の方法の適用が可能である。   In the first and second embodiments, the connection destination switching between the mobile phone network and the wireless LAN has been described. However, the same method can be applied to a wireless system such as WiMAX and PHS other than the mobile phone network and the wireless LAN. It is.

１１ 携帯電話網−ＩＦ
１２ 無線ＬＡＮ−ＩＦ
１３ 通信制御部
１４ 通信品質測定部
１５ 接続先判定部
１６ 無線ＬＡＮエリア情報格納部
１７ 端末位置把握部
１８ ＧＰＳ
１９ 加速度センサ
２０ 端末位置判定部
２１ サーバアクセス部 11 Mobile phone network-IF
12 Wireless LAN-IF
DESCRIPTION OF SYMBOLS 13 Communication control part 14 Communication quality measurement part 15 Connection destination determination part 16 Wireless LAN area information storage part 17 Terminal position grasping part 18 GPS
19 Acceleration Sensor 20 Terminal Position Determination Unit 21 Server Access Unit

Claims (6)

第２の通信網のエリア内に第１の通信網のエリアが局所的に存在するような包含関係または隣接関係にある第１の通信網と第２の通信網に接続可能な複数のインタフェース部と、
第１の通信網の通信品質と第２の通信網の通信品質を比較し、通信品質が良好な通信網と接続する接続先選択手段と
を備えた無線端末装置において、
前記第２の通信網に接続中に前記第１の通信網に接続するインタフェース部をスリープ状態に設定し、前記第１の通信網に接続中に前記第２の通信網に接続するインタフェース部をスリープ状態に設定するスリープ制御手段と、
前記第１の通信網のエリア情報を格納するエリア情報格納手段と、
前記無線端末装置の現在位置と移動速度および移動方向から得られる前記無線端末装置の位置情報と前記第１の通信網のエリア情報を照合し、前記第２の通信網に接続中には、前記無線端末装置が前記第１の通信網のエリアに近づいていることを検知し、前記第１の通信網に接続中には、前記無線端末装置が前記第１の通信網のエリア外に近づいていることを検知する端末位置判定手段とを備え、
前記接続先選択手段は、
前記端末位置判定手段で前記第２の通信網に接続中の前記無線端末装置が前記第１の通信網のエリアに近づいていることを検知したときに、前記第１の通信網に接続する前記インタフェース部をスリープ状態からアクティブ状態にして通信品質を監視し、前記第１の通信網の通信品質が前記第２の通信網の通信品質より良い場合に、接続先を前記第２の通信網から前記第１の通信網に切り替え、
前記端末位置判定手段で前記第１の通信網に接続中の前記無線端末装置が前記第１の通信網のエリア外に近づいていることを検知したときに、前記第２の通信網に接続する前記インタフェース部をスリープ状態からアクティブ状態にして通信品質を監視し、前記第２の通信網の通信品質が前記第１の通信網の通信品質より良い場合に、接続先を前記第１の通信網から前記第２の通信網に切り替える構成である
ことを特徴とする無線端末装置。 A plurality of interface units connectable to the first communication network and the second communication network that are in an inclusive relationship or adjacent relationship such that the area of the first communication network locally exists within the area of the second communication network When,
In a wireless terminal device comprising a connection destination selecting means for comparing a communication quality of a first communication network and a communication quality of a second communication network and connecting to a communication network having a good communication quality,
An interface unit connected to the first communication network is set to a sleep state while connected to the second communication network, and an interface unit connected to the second communication network is connected to the first communication network. A sleep control means for setting the sleep state ;
Area information storage means for storing area information of the first communication network;
The position information of the wireless terminal device obtained from the current position, the moving speed and the moving direction of the wireless terminal device and the area information of the first communication network are collated, and while being connected to the second communication network, Detecting that a wireless terminal device is approaching the area of the first communication network, and connecting to the first communication network, the wireless terminal device is approaching outside the area of the first communication network. Terminal position determination means for detecting that
The connection destination selection means includes
When the terminal position determination means detects that the wireless terminal device connected to the second communication network is approaching the area of the first communication network, the connection to the first communication network is performed. When the communication quality of the first communication network is better than the communication quality of the second communication network by monitoring the communication quality by changing the interface unit from the sleep state to the active state, the connection destination is connected from the second communication network. Switch to the first communication network ,
When the terminal position determination unit detects that the wireless terminal device connected to the first communication network is approaching the outside of the first communication network, the terminal position determination unit connects to the second communication network. When the communication quality of the second communication network is better than the communication quality of the first communication network, the interface unit is changed from the sleep state to the active state, and the communication quality of the second communication network is better than the communication quality of the first communication network. the wireless terminal device, characterized in that the toggle its configuration to the second communication network from. 請求項１に記載の無線端末装置において、
前記エリア情報格納手段に代えて、前記第１の通信網のエリア情報を管理するネットワーク上のサーバにアクセスして前記第１の通信網のエリア情報を取得するエリア情報取得手段を備えた
ことを特徴とする無線端末装置。 The wireless terminal device according to claim 1 ,
Instead of the area information storage means, an area information acquisition means for acquiring area information of the first communication network by accessing a server on the network that manages the area information of the first communication network is provided. A wireless terminal device. 請求項１または請求項２に記載の無線端末装置において、
前記第１の通信網は無線ＬＡＮであり、前記第２の通信網は携帯電話網である
ことを特徴とする無線端末装置。 In the radio | wireless terminal apparatus of Claim 1 or Claim 2,
The wireless terminal device, wherein the first communication network is a wireless LAN, and the second communication network is a mobile phone network. 第２の通信網のエリア内に第１の通信網のエリアが局所的に存在するような包含関係または隣接関係にある第１の通信網と第２の通信網に接続可能な複数のインタフェース部を備え、接続先選択手段で、第１の通信網の通信品質と第２の通信網の通信品質を比較し、通信品質が良好な通信網と接続する無線端末装置の接続先切替方法において、
スリープ制御手段を用いて、前記第２の通信網に接続中に前記第１の通信網に接続するインタフェース部をスリープ状態に設定し、前記第１の通信網に接続中に前記第２の通信網に接続するインタフェース部をスリープ状態に設定し、
エリア情報格納手段に前記第１の通信網のエリア情報を格納し、
端末位置判定手段を用いて、前記無線端末装置の現在位置と移動速度および移動方向から得られる前記無線端末装置の位置情報と前記第１の通信網のエリア情報を照合し、前記第２の通信網に接続中には、前記無線端末装置が前記第１の通信網のエリアに近づいていることを検知し、前記第１の通信網に接続中には、前記無線端末装置が前記第１の通信網のエリア外に近づいていることを検知し、
前記接続先選択手段は、
前記端末位置判定手段で前記第２の通信網に接続中の前記無線端末装置が前記第１の通信網のエリアに近づいていることを検知したときに、前記第１の通信網に接続する前記インタフェース部をスリープ状態からアクティブ状態にして通信品質を監視し、前記第１の通信網の通信品質が前記第２の通信網の通信品質より良い場合に、接続先を前記第２の通信網から前記第１の通信網に切り替え、
前記端末位置判定手段で前記第１の通信網に接続中の前記無線端末装置が前記第１の通信網のエリア外に近づいていることを検知したときに、前記第２の通信網に接続する前記インタフェース部をスリープ状態からアクティブ状態にして通信品質を監視し、前記第２の通信網の通信品質が前記第１の通信網の通信品質より良い場合に、接続先を前記第１の通信網から前記第２の通信網に切り替える
ことを特徴とする無線端末装置の接続先切替方法。 A plurality of interface units connectable to the first communication network and the second communication network that are in an inclusive relationship or adjacent relationship such that the area of the first communication network locally exists within the area of the second communication network In the connection destination switching method of the wireless terminal device for comparing the communication quality of the first communication network and the communication quality of the second communication network with the connection destination selection means, and connecting to the communication network with good communication quality,
An interface unit connected to the first communication network is set to a sleep state during connection to the second communication network using a sleep control means, and the second communication is performed while connected to the first communication network. Set the interface that connects to the network to sleep,
Storing area information of the first communication network in an area information storage means;
Using the terminal position determination means, the position information of the wireless terminal device obtained from the current position, the moving speed and the moving direction of the wireless terminal device is collated with the area information of the first communication network, and the second communication While connected to the network, it detects that the wireless terminal device is approaching the area of the first communication network, and while connected to the first communication network, the wireless terminal device detects the first communication network. Detecting that you are approaching outside the communication network area ,
The connection destination selection means includes
When the terminal position determination means detects that the wireless terminal device connected to the second communication network is approaching the area of the first communication network, the connection to the first communication network is performed. When the communication quality of the first communication network is better than the communication quality of the second communication network by monitoring the communication quality by changing the interface unit from the sleep state to the active state, the connection destination is connected from the second communication network. Switch to the first communication network ,
When the terminal position determination unit detects that the wireless terminal device connected to the first communication network is approaching the outside of the first communication network, the terminal position determination unit connects to the second communication network. When the communication quality of the second communication network is better than the communication quality of the first communication network, the interface unit is changed from the sleep state to the active state, and the communication quality of the second communication network is better than the communication quality of the first communication network. destination switching method of the wireless terminal device, characterized in that you switch to the second communication network from. 請求項４に記載の無線端末装置の接続先切替方法において、
前記エリア情報格納手段に代えて、前記第１の通信網のエリア情報を管理するネットワーク上のサーバにアクセスして前記第１の通信網のエリア情報を取得する
ことを特徴とする無線端末装置の接続先切替方法。 In the connection destination switching method of the wireless terminal device according to claim 4 ,
Instead of the area information storage means, a server on a network that manages area information of the first communication network is accessed to acquire area information of the first communication network. Connection destination switching method. 請求項４または請求項５に記載の無線端末装置の接続先切替方法において、
前記第１の通信網は無線ＬＡＮであり、前記第２の通信網は携帯電話網である
ことを特徴とする無線端末装置の接続先切替方法。 In the connection switching method of the wireless terminal device according to claim 4 or 5 ,
The wireless communication apparatus switching method according to claim 1, wherein the first communication network is a wireless LAN, and the second communication network is a mobile phone network.
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