JP4634061B2 - Communication terminal - Google Patents

Communication terminal Download PDF

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JP4634061B2
JP4634061B2 JP2004110007A JP2004110007A JP4634061B2 JP 4634061 B2 JP4634061 B2 JP 4634061B2 JP 2004110007 A JP2004110007 A JP 2004110007A JP 2004110007 A JP2004110007 A JP 2004110007A JP 4634061 B2 JP4634061 B2 JP 4634061B2
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map information
communication terminal
information
base station
unit
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JP2005295380A (en
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政宏 海和
浩一 沢井
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NTT Docomo Inc
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本発明は、任意に設置された複数の無線基地局からの受信信号を利用して自己の位置を測定し表示する機能を備えた通信端末に関するものである。   The present invention relates to a communication terminal having a function of measuring and displaying its own position using received signals from a plurality of radio base stations installed arbitrarily.

携帯電話等の通信端末において、現在位置を測定して表示する機能に対するニーズは極めて高く、ＧＰＳ（Global Positioning System）機能を搭載した通信端末も市販されるに至っている。   In communication terminals such as mobile phones, there is an extremely high need for the function of measuring and displaying the current position, and communication terminals equipped with a GPS (Global Positioning System) function have been put on the market.

その他に、設置位置が既知の無線基地局からの信号を受信し、三角測量の原理で通信端末の位置を検出する技術も存在する（例えば、特許文献１参照。）。
特開２０００−３４８２９７号公報 In addition, there is a technique for receiving a signal from a radio base station whose installation position is known and detecting the position of the communication terminal based on the principle of triangulation (see, for example, Patent Document 1).
JP 2000-348297 A

上述したように、従来は通信端末の位置を検出するため、ＧＰＳ等の大掛かりなシステムを利用したり、無線基地局側に測位のための専用の機能を設ける等、予め測位のためのインフラを整備しなければならず、相当な設備投資を行わなければならないという問題があった。   As described above, conventionally, in order to detect the position of the communication terminal, a large-scale system such as GPS is used, or a dedicated function for positioning is provided on the wireless base station side, etc. There was a problem that it had to be maintained and considerable capital investment had to be made.

また、ＧＰＳでは衛星の電波が届かない屋内や地下では使用することができないという問題があった。   Further, there is a problem that GPS cannot be used indoors or underground where satellite radio waves do not reach.

本発明は上記の従来の問題点に鑑み提案されたものであり、その目的とするところは、任意に設置された複数の無線基地局からの受信信号を利用し、測位のための専用のインフラを必要とせずに自己の位置を測定し表示する機能を備えた通信端末を提供することにある。なお、任意に設置された無線基地局としては、携帯電話やＰＨＳ（Personal Handyphone System）の無線基地局のみならず、無線ＬＡＮ（Local Area Network）やBluetooth等の無線基地局も利用することができる。   The present invention has been proposed in view of the above-described conventional problems, and an object of the present invention is to use dedicated signals for positioning using received signals from a plurality of radio base stations installed arbitrarily. It is an object of the present invention to provide a communication terminal having a function of measuring and displaying its own position without the need for a device. In addition, as a wireless base station installed arbitrarily, not only a mobile phone and a PHS (Personal Handyphone System) wireless base station but also a wireless base station such as a wireless local area network (LAN) or Bluetooth can be used. .

上記の課題を解決するため、本発明にあっては、請求項１に記載されるように、任意に設置された複数の無線基地局から受信した信号の強度から特定の無線基地局との間の相対距離を含む基地局情報を取得する基地局情報取得部と、加速度の方向から移動方向を検出する移動方向検出部と、直前のユーザ設定もしくは算出により求められた現在位置、ならびに、上記相対距離の変化量および上記移動方向に基づいて、新たな現在位置を算出する位置情報算出部と、算出された上記現在位置を表示する位置情報表示部とを備えるようにしている。

To solve the above problems, in the present invention, as described in claim 1, in particular from the intensity of the signal received from the optionally installed the multiple radio base stations to the wireless base station A base station information acquisition unit that acquires base station information including a relative distance between, a movement direction detection unit that detects a movement direction from the direction of acceleration, a current position obtained by a previous user setting or calculation, and the above A position information calculation unit that calculates a new current position based on the amount of change in relative distance and the moving direction, and a position information display unit that displays the calculated current position are provided.

また、請求項２に記載されるように、上記位置情報算出部は初期位置において地図上の位置と現在位置との対応付けを行うようにすることができる。   According to a second aspect of the present invention, the position information calculation unit can associate the position on the map with the current position at the initial position.

また、請求項３に記載されるように、上記移動方向検出部は加速度センサおよびコンパスにより移動方向を検出するようにすることができる。   According to a third aspect of the present invention, the moving direction detection unit can detect the moving direction with an acceleration sensor and a compass.

また、請求項４に記載されるように、上記位置情報算出部により算出された現在位置を地図情報と比較してマッチングを行う地図情報比較部を備えるようにすることができる。   According to a fourth aspect of the present invention, a map information comparison unit that performs matching by comparing the current position calculated by the position information calculation unit with map information can be provided.

また、請求項５に記載されるように、上記地図情報を保持するとともに、上記地図情報のカバーするエリアを外れる場合に外部の地図情報配信装置に地図情報の配信を要求する地図情報管理部を備えるようにすることができる。   According to a fifth aspect of the present invention, there is provided a map information management unit that holds the map information and requests an external map information distribution device to distribute the map information when the map information is outside the area covered by the map information. Can be provided.

本発明にあっては、任意に設置された複数の無線基地局からの受信信号を利用することで、測位のための専用のインフラを必要とせずに自己の位置を測定し表示する機能を実現することができる。   In the present invention, by using received signals from a plurality of radio base stations installed arbitrarily, the function of measuring and displaying its own position without requiring a dedicated infrastructure for positioning is realized. can do.

以下、本発明の好適な実施形態につき、図面を参照して説明する。   Preferred embodiments of the present invention will be described below with reference to the drawings.

図１は本発明の一実施形態を示す構成図である。   FIG. 1 is a block diagram showing an embodiment of the present invention.

図１において、通信端末１はユーザが所持する携帯電話、ＰＨＳ、ＰＤＡ（Personal Digital Assistant）、パーソナルコンピュータ等の通信機能を備えた移動端末であり、無線基地局２Ａ〜２Ｃは携帯電話、ＰＨＳ、無線ＬＡＮ、Bluetooth等の任意に設置された基地局である。なお、無線基地局２Ａ〜２Ｃが設置される場所は屋外、屋内を問わない。また、地図情報配信装置３は通信端末１からの要求に基づいて地図情報を配信するための装置である。   In FIG. 1, a communication terminal 1 is a mobile terminal having a communication function such as a mobile phone, PHS, PDA (Personal Digital Assistant), personal computer, etc. possessed by a user, and radio base stations 2A to 2C are mobile phones, PHS, It is a base station installed arbitrarily such as a wireless LAN or Bluetooth. The place where the radio base stations 2A to 2C are installed may be outdoors or indoors. The map information distribution device 3 is a device for distributing map information based on a request from the communication terminal 1.

通信端末１には、通常の通信機能等の他に、無線基地局２Ａ〜２Ｃからの信号を受信する基地局信号受信部１１と、受信した信号の強度から特定の無線基地局との間の相対距離を含む基地局情報を取得する基地局情報取得部１２と、加速度センサおよびコンパス等により通信端末１の移動方向を検出する移動方向検出部１３と、基地局情報取得部１２によって取得された特定の無線基地局との間の相対距離の変化および移動方向検出部１３によって検出された移動方向に基づいて現在位置を算出する位置情報算出部１４と、位置情報算出部１４により算出された現在位置を地図情報と比較してマッチングを行う地図情報比較部１５と、現在位置を表示する位置情報表示部１６と、地図情報を保持するとともに、その地図情報のカバーするエリアを外れる場合に外部の地図情報配信装置３に地図情報の配信を要求する地図情報管理部１７と、地図情報配信装置３から地図情報を受信する地図情報受信部１８とが設けられている。   In addition to the normal communication function, the communication terminal 1 includes a base station signal receiving unit 11 that receives signals from the radio base stations 2A to 2C, and a specific radio base station based on the intensity of the received signal. The base station information acquisition unit 12 that acquires base station information including a relative distance, the movement direction detection unit 13 that detects the movement direction of the communication terminal 1 using an acceleration sensor and a compass, and the base station information acquisition unit 12 A position information calculation unit 14 that calculates a current position based on a change in relative distance to a specific radio base station and a movement direction detected by the movement direction detection unit 13, and a current value calculated by the position information calculation unit 14 The map information comparison unit 15 that compares the position with the map information and performs matching, the position information display unit 16 that displays the current position, the map information, and the area covered by the map information. A map information management section 17 for requesting distribution of the map information to the outside of the map information distribution apparatus 3 if out of the, and the map information receiving unit 18 is provided which receives the map information from the map information distribution apparatus 3.

一方、無線基地局２Ａ〜２Ｃは任意に設置されたものであって、本発明のために特に新たな機能を付加するものではないが、一般に自己の識別情報等を送信信号の一部に含めて報知するための基地局識別情報報知部２１を備えている。また、地図情報配信装置３は通信端末１の地図情報管理部１７からの要求に応じて地図情報を配信するための地図情報配信部３１を備えている。   On the other hand, the radio base stations 2A to 2C are arbitrarily installed and do not add a new function for the present invention, but generally include their own identification information and the like as part of the transmission signal. The base station identification information notifying unit 21 is provided. Further, the map information distribution apparatus 3 includes a map information distribution unit 31 for distributing map information in response to a request from the map information management unit 17 of the communication terminal 1.

図２は上記の実施形態の動作を示すシーケンス図であり、以下、このシーケンス図に沿って上記実施形態の動作を説明する。   FIG. 2 is a sequence diagram showing the operation of the above embodiment. Hereinafter, the operation of the above embodiment will be described with reference to this sequence diagram.

先ず、通信端末１が無線基地局２Ａ〜２Ｃの設置されるエリアに入ると、通信端末１の基地局信号受信部１１は無線基地局２Ａ〜２Ｃのいずれかもしくは複数より信号を受信する（ステップＳ１）。この信号には無線基地局２Ａ〜２Ｃの基地局識別情報報知部２１が報知する基地局識別情報が含まれている。受信された信号は基地局情報取得部１２に渡され（ステップＳ２）、基地局情報取得部１２は基地局識別情報によって無線基地局を特定した上で、その受信強度から特定の無線基地局との間の相対距離を含む基地局情報を取得し（ステップＳ３）、位置情報算出部１４に渡す（ステップＳ４）。複数の無線基地局の信号を受信している場合には、無線基地局毎の基地局情報が含まれる。ここで、無線基地局２Ａ〜２Ｃの送信電力は、携帯電話、ＰＨＳ、無線ＬＡＮ、Bluetooth等の無線基地局のタイプによって所定の値に定められているため、若干の誤差は発生するものの、受信強度から無線基地局との相対距離を知ることができる。   First, when the communication terminal 1 enters an area where the radio base stations 2A to 2C are installed, the base station signal receiving unit 11 of the communication terminal 1 receives signals from one or more of the radio base stations 2A to 2C (steps). S1). This signal includes base station identification information reported by the base station identification information reporting unit 21 of the radio base stations 2A to 2C. The received signal is passed to the base station information acquisition unit 12 (step S2). The base station information acquisition unit 12 specifies the radio base station by the base station identification information, and then determines the specific radio base station from the received intensity. Base station information including the relative distance between the two is acquired (step S3) and passed to the position information calculation unit 14 (step S4). When receiving signals from a plurality of radio base stations, base station information for each radio base station is included. Here, the transmission power of the radio base stations 2A to 2C is set to a predetermined value depending on the type of the radio base station such as a mobile phone, PHS, wireless LAN, Bluetooth, etc. The relative distance from the radio base station can be known from the intensity.

次いで、通信端末１の位置情報算出部１４は、無線基地局２Ａ〜２Ｃの設置されるエリアに入った最初に行うべき処理として、初期位置の地図上位置との対応付けを行う（ステップＳ５）。図３は初期位置における地図上位置との対応付けの様子を示す図であり、通信端末１が図示の位置にある場合、各無線基地局２Ａ〜２Ｃから受信した信号の電界強度に基づいて求められた相対距離ＬＡ〜ＬＣの情報を含む基地局情報と関連付けて、地図上における現在位置をユーザからの指示等により設定する。すなわち、ユーザからの指示等により地図上の現在位置を初期位置として取得し、その時点における無線基地局２Ａ〜２Ｃとの相対距離ＬＡ〜ＬＣの情報（各相対距離ＬＡ〜ＬＣは無線基地局２Ａ〜２Ｃの識別情報によって識別される）を含む基地局情報と関連付けて記憶する。図４は初期位置における通信端末１の表示画面１０の例を示す図であるが、通信端末１の現在位置を示すアイコンＩを地図上で指定等させることにより、初期位置における現在位置を地図上の特定の位置に対応付けることができる。また、通路等の所定の位置に予め非接触タグ等を設置しておき、その近傍を通過した際に自動的に初期位置における地図上位置との対応付けを行うようにすることもできる。この場合、非接触タグ等から送信される情報には、地図上の位置を特定する情報が含まれる。   Next, the position information calculation unit 14 of the communication terminal 1 associates the initial position with the map position as a process to be performed first when entering the areas where the radio base stations 2A to 2C are installed (step S5). . FIG. 3 is a diagram showing how the initial position is associated with the position on the map. When the communication terminal 1 is at the illustrated position, it is obtained based on the electric field strength of the signal received from each of the radio base stations 2A to 2C. In association with the base station information including the information on the relative distances LA to LC, the current position on the map is set by an instruction from the user or the like. That is, the current position on the map is acquired as an initial position in accordance with an instruction from the user and the like, and information on the relative distances LA to LC with the wireless base stations 2A to 2C at that time (each relative distance LA to LC is the wireless base station 2A). Stored in association with base station information including (identified by identification information of ~ 2C). FIG. 4 is a diagram showing an example of the display screen 10 of the communication terminal 1 at the initial position. By specifying the icon I indicating the current position of the communication terminal 1 on the map, the current position at the initial position is displayed on the map. Can be associated with a specific position. Alternatively, a non-contact tag or the like may be set in advance at a predetermined position such as a passage so that the map is automatically associated with the map position at the initial position when passing through the vicinity. In this case, the information transmitted from the non-contact tag or the like includes information for specifying the position on the map.

次いで、図２において、通信端末１の基地局情報取得部１２は、基地局信号受信部１１を介して無線基地局２Ａ〜２Ｃから受信した信号に基づき、特定の無線基地局との間の相対距離を含む基地局情報を取得し（ステップＳ６〜Ｓ８）、位置情報算出部１４に渡す（ステップＳ９）。   Next, in FIG. 2, the base station information acquisition unit 12 of the communication terminal 1 is based on signals received from the radio base stations 2 </ b> A to 2 </ b> C via the base station signal reception unit 11, and is relative to a specific radio base station. Base station information including the distance is acquired (steps S6 to S8) and passed to the position information calculation unit 14 (step S9).

一方、通信端末１の移動方向検出部１３は加速度センサおよびコンパス等により通信端末１の移動方向を逐次検出しており、位置情報算出部１４は基地局情報取得部１２から与えられた特定の無線基地局との間の相対距離の変化および移動方向検出部１３によって検出された通信端末１の移動方向に基づいて現在位置（無線基地局２Ａ〜２Ｃと通信端末１との相対位置）を算出し（ステップＳ１０）、初期位置の情報とともに位置情報算出部１４に渡す（ステップＳ１１）。   On the other hand, the movement direction detection unit 13 of the communication terminal 1 sequentially detects the movement direction of the communication terminal 1 using an acceleration sensor, a compass, and the like, and the position information calculation unit 14 receives a specific wireless signal given from the base station information acquisition unit 12. Based on the change in the relative distance to the base station and the movement direction of the communication terminal 1 detected by the movement direction detection unit 13, the current position (relative position between the radio base stations 2A to 2C and the communication terminal 1) is calculated. (Step S10), the initial position information is transferred to the position information calculation unit 14 (Step S11).

地図情報比較部１５は、位置情報算出部１４により渡された現在位置を地図情報管理部１７の保持する地図情報と比較してマッチングを行い、地図上の現在位置を特定する（ステップＳ１２）。この際、距離測定の誤差により通路等から外れる場合、移動範囲が通路内に収まるよう、補正が行われる。図５は通信端末１の移動のトレースの様子を示す図であり、通信端末１が移動経路Ｒに沿って移動したものとすると、通信端末１の移動は逐次に検出され、図６に示すように、通路等に沿って通信端末１の移動が行われるよう、その都度にマップマッチングが行われる。   The map information comparison unit 15 compares the current position passed by the position information calculation unit 14 with the map information held by the map information management unit 17, performs matching, and specifies the current position on the map (step S12). In this case, if the distance measurement error deviates from the passage or the like, correction is performed so that the moving range is within the passage. FIG. 5 is a diagram showing a movement trace of the communication terminal 1. Assuming that the communication terminal 1 has moved along the movement route R, the movement of the communication terminal 1 is detected sequentially, as shown in FIG. In addition, map matching is performed each time so that the communication terminal 1 is moved along the passage or the like.

次いで、図２において、マップマッチングした結果は地図情報比較部１５から位置情報表示部１６に渡され（ステップＳ１３）、位置情報表示部１６は地図情報管理部１７に対して地図情報を要求し（ステップＳ１４）、地図情報管理部１７は地図情報を読み出す（ステップＳ１５）。ここで、通信端末１内に保持された地図情報で足りる場合には、地図情報管理部１７から位置情報表示部１６に地図情報が渡され（ステップＳ１６）、位置情報表示部１６は表示画面上に地図情報とともに現在位置を表示する（ステップＳ１７）。図７は移動後の表示画面の例を示す図であり、表示画面１０上にアイコンＩによって通信端末１の現在位置が表示される。   Next, in FIG. 2, the map matching result is passed from the map information comparison unit 15 to the position information display unit 16 (step S13), and the position information display unit 16 requests map information from the map information management unit 17 ( Step S14), the map information management unit 17 reads the map information (step S15). Here, when the map information held in the communication terminal 1 is sufficient, the map information is transferred from the map information management unit 17 to the position information display unit 16 (step S16), and the position information display unit 16 is displayed on the display screen. The current position is displayed together with the map information (step S17). FIG. 7 is a diagram illustrating an example of the display screen after movement. The current position of the communication terminal 1 is displayed on the display screen 10 by an icon I.

一方、通信端末１の移動により地図情報管理部１７が保持する地図情報ではカバーできなくなった場合、地図情報管理部１７は外部の地図情報配信装置３に対して地図情報の要求を行い（ステップＳ１８）、これを受けて地図情報配信装置３の地図情報配信部３１は必要な地図情報を切り出し（ステップＳ１９）、通信端末１に向けて配信する（ステップＳ２０）。通信端末１の地図情報受信部１８は地図情報配信装置３から地図情報を受信すると、これを地図情報管理部１７を介して位置情報表示部１６に渡し（ステップＳ２１、Ｓ１６）、位置情報表示部１６は表示画面上に地図情報とともに現在位置を表示する（ステップＳ１７）。図８は保持する地図情報の限界に達した場合の地図情報の取得の様子を示す図であり、通信端末１が図示の位置に移動した時点で、保持する地図情報でカバーできなくなると、地図情報配信装置３から地図情報Ｄの配信を受けるものである。   On the other hand, if the map information held by the map information management unit 17 cannot be covered by the movement of the communication terminal 1, the map information management unit 17 requests the map information from the external map information distribution device 3 (step S18). In response, the map information distribution unit 31 of the map information distribution device 3 cuts out necessary map information (step S19) and distributes it to the communication terminal 1 (step S20). When the map information receiving unit 18 of the communication terminal 1 receives the map information from the map information distribution device 3, the map information receiving unit 18 passes the map information to the position information display unit 16 via the map information management unit 17 (steps S21 and S16). 16 displays the current position along with the map information on the display screen (step S17). FIG. 8 is a diagram showing how map information is acquired when the limit of the map information to be held is reached. When the communication terminal 1 moves to the position shown in FIG. The distribution of the map information D is received from the information distribution device 3.

以上のように、任意に設置された複数の無線基地局２Ａ〜２Ｃからの受信信号を利用することで、測位のための専用のインフラを必要とせずに自己の位置を測定し表示することができる。特に、無線基地局として無線ＬＡＮ、Bluetooth等を使用する場合、従来は困難であった屋内での位置検出を容易に行うことができる。   As described above, by using received signals from a plurality of radio base stations 2A to 2C that are arbitrarily installed, it is possible to measure and display its own position without requiring a dedicated infrastructure for positioning. it can. In particular, when a wireless LAN, Bluetooth, or the like is used as a wireless base station, indoor position detection that has been difficult in the past can be easily performed.

以上、本発明の好適な実施の形態により本発明を説明した。ここでは特定の具体例を示して本発明を説明したが、特許請求の範囲に定義された本発明の広範な趣旨および範囲から逸脱することなく、これら具体例に様々な修正および変更を加えることができることは明らかである。すなわち、具体例の詳細および添付の図面により本発明が限定されるものと解釈してはならない。   The present invention has been described above by the preferred embodiments of the present invention. While the invention has been described with reference to specific embodiments, various modifications and changes may be made to these embodiments without departing from the broad spirit and scope of the invention as defined in the claims. Obviously you can. In other words, the present invention should not be construed as being limited by the details of the specific examples and the accompanying drawings.

本発明の一実施形態を示す構成図である。It is a block diagram which shows one Embodiment of this invention. 実施形態の動作を示すシーケンス図である。It is a sequence diagram which shows operation | movement of embodiment. 初期位置における地図上位置との対応付けの様子を示す図である。It is a figure which shows the mode of matching with the position on a map in an initial position. 初期位置における表示画面の例を示す図である。It is a figure which shows the example of the display screen in an initial position. 通信端末の移動のトレースの様子を示す図である。It is a figure which shows the mode of the trace of a movement of a communication terminal. マップマッチングの様子を示す図である。It is a figure which shows the mode of map matching. 移動後の表示画面の例を示す図である。It is a figure which shows the example of the display screen after a movement. 保持する地図情報の限界に達した場合の地図情報の取得の様子を示す図である。It is a figure which shows the mode of acquisition of the map information when the limit of the map information to hold | maintain is reached.

符号の説明Explanation of symbols

１ 通信端末
１１ 基地局信号受信部
１２ 基地局情報取得部
１３ 移動方向検出部
１４ 位置情報算出部
１５ 地図情報比較部
１６ 位置情報表示部
１７ 地図情報管理部
１８ 地図情報受信部
２Ａ〜２Ｃ 無線基地局
２１ 基地局識別情報報知部
３ 地図情報配信装置
３１ 地図情報配信部 DESCRIPTION OF SYMBOLS 1 Communication terminal 11 Base station signal receiving part 12 Base station information acquisition part 13 Movement direction detection part 14 Location information calculation part 15 Map information comparison part 16 Location information display part 17 Map information management part 18 Map information reception part 2A-2C Radio base Station 21 Base station identification information notification unit 3 Map information distribution device 31 Map information distribution unit

Claims (5)

任意に設置された複数の無線基地局から受信した信号の強度から特定の無線基地局との間の相対距離を含む基地局情報を取得する基地局情報取得部と、
加速度の方向から移動方向を検出する移動方向検出部と、
直前のユーザ設定もしくは算出により求められた現在位置、ならびに、上記相対距離の変化量および上記移動方向に基づいて、新たな現在位置を算出する位置情報算出部と、
算出された上記現在位置を表示する位置情報表示部とを備えたことを特徴とする通信端末。 And the base station information acquisition unit that acquires the base station information including the relative distance between the particular radio base station from the strength of signals received from an optionally installed the multiple radio base stations,
A moving direction detector that detects the moving direction from the direction of acceleration;
A position information calculation unit that calculates a new current position based on the current position obtained by the previous user setting or calculation, and the change amount of the relative distance and the movement direction;
A communication terminal comprising: a position information display unit that displays the calculated current position. 上記位置情報算出部は初期位置において地図上の位置と現在位置との対応付けを行うことを特徴とする請求項１に記載の通信端末。   The communication terminal according to claim 1, wherein the position information calculation unit associates a position on the map with a current position at an initial position. 上記移動方向検出部は加速度センサおよびコンパスにより移動方向を検出することを特徴とする請求項１または２のいずれか一項に記載の通信端末。   The communication terminal according to claim 1, wherein the moving direction detection unit detects a moving direction using an acceleration sensor and a compass. 上記位置情報算出部により算出された現在位置を地図情報と比較してマッチングを行う地図情報比較部を備えたことを特徴とする請求項１乃至３のいずれか一項に記載の通信端末。   The communication terminal according to any one of claims 1 to 3, further comprising a map information comparison unit that performs matching by comparing the current position calculated by the position information calculation unit with map information. 上記地図情報を保持するとともに、上記地図情報のカバーするエリアを外れる場合に外部の地図情報配信装置に地図情報の配信を要求する地図情報管理部を備えたことを特徴とする請求項４に記載の通信端末。   5. The map information management unit according to claim 4, further comprising a map information management unit that holds the map information and requests an external map information distribution device to distribute map information when the map information is outside an area covered by the map information. Communication terminal.
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