JP2013247600A - Radio communication system - Google Patents

Radio communication system Download PDF

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JP2013247600A
JP2013247600A JP2012121686A JP2012121686A JP2013247600A JP 2013247600 A JP2013247600 A JP 2013247600A JP 2012121686 A JP2012121686 A JP 2012121686A JP 2012121686 A JP2012121686 A JP 2012121686A JP 2013247600 A JP2013247600 A JP 2013247600A
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communication
base station
terminal
area
communication base
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JP5995526B2 (en
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Taisei Suemitsu
大成 末満
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Mitsubishi Electric 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system comprising a plurality of communication base stations, the radio communication system being able to suppress signal transmission power and also enhancing communication efficiency .SOLUTION: In a radio communication system, communication zones of respective communication base stations are set without overlapping with each other. Each communication base station comprises: a reporting unit 11 which reports its own base station information to a report area 15 covering the communication zones of the plurality of communication base stations; a reception unit 12 which receives position information of a terminal having received the base station information, from the terminal; a determination unit 14 which determines whether the terminal exists in its own communication zone on the basis of the position information of the terminal; and a transmission unit 13 which, when the terminal exists in the communication zone, transmits signals relaying communication of the terminal by limiting a signal transmission direction to a direction of the position of the terminal.

Description

本発明は無線通信システムに関し、特に複数の通信基地局を用いて通信領域を形成する無線通信システムに関するものである。   The present invention relates to a radio communication system, and more particularly to a radio communication system that forms a communication area using a plurality of communication base stations.

従来から、携帯電話等の通信端末の通信を中継する通信基地局を備える無線通信システムが広く普及している。   Conventionally, a wireless communication system including a communication base station that relays communication of a communication terminal such as a mobile phone has been widely used.

このような無線通信システムにおける通信基地局は、例えば半径数百ｍ〜十数ｋｍの通信範囲を有しているが、１つの通信基地局の通信範囲を超える領域で通信の中継を可能にするため、または、１つの通信基地局の通信範囲内で信号（電波）を良好に受信できない領域を補完するため等の目的で、互いの通信範囲が少なくとも一部重なる複数の通信基地局が無線通信システムに用いられる場合がある（特許文献１参照）。   A communication base station in such a wireless communication system has a communication range of, for example, a radius of several hundred m to several tens of km, but enables communication relay in an area exceeding the communication range of one communication base station. Therefore, a plurality of communication base stations whose communication ranges overlap at least partially overlap each other for the purpose of supplementing a region where signals (radio waves) cannot be received well within the communication range of one communication base station. It may be used for a system (see Patent Document 1).

特開２０１０−５６８８１号公報JP 2010-56881 A

しかし上記のような無線通信システムにおいて、通信情報量の増加等に伴い信号を送信するための電力が増加しており、送信電力を抑えつつ、より効率のよい通信を行うことに対する需要が高まっていた。   However, in the wireless communication system as described above, the power for transmitting signals is increasing along with an increase in the amount of communication information, etc., and there is an increasing demand for more efficient communication while suppressing transmission power. It was.

本発明は、上記のような問題を解決するためになされたものであり、複数の通信基地局を備える無線通信システムにおいて、信号の送信電力を抑えつつ、通信の効率を高めることができる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 to solve the above-described problems, and in a wireless communication system including a plurality of communication base stations, wireless communication capable of improving communication efficiency while suppressing signal transmission power. The purpose is to provide a system.

本発明の一態様に関する無線通信システムは、自身の通信圏内において端末の通信を中継する複数の通信基地局を備え、各前記通信基地局の前記通信圏は、互いに重ならず設定され、各前記通信基地局が、複数の前記通信基地局の前記通信圏に亘る報知領域に、自身の基地局情報を報知する報知部と、前記基地局情報を受信した前記端末から、当該端末の位置情報を受信する受信部と、前記端末の前記位置情報に基づいて、前記端末の位置が自身の前記通信圏に含まれるか否かを判定する判定部と、前記端末の位置が自身の前記通信圏に含まれる場合、当該端末の位置する方向に信号送信方向を限定して当該端末の通信を中継する信号を送信する送信部とを備えることを特徴とする。   A wireless communication system according to an aspect of the present invention includes a plurality of communication base stations that relay communication of a terminal within its own communication area, and the communication areas of each of the communication base stations are set so as not to overlap each other, A communication base station reports the location information of the terminal from a notification unit that reports its base station information to a notification area that covers the communication area of a plurality of communication base stations, and the terminal that has received the base station information. A receiving unit for receiving, a determination unit for determining whether or not the position of the terminal is included in the communication range of the terminal based on the position information of the terminal, and the position of the terminal in the communication range of the terminal If it is included, a transmission unit that transmits a signal that relays communication of the terminal by limiting a signal transmission direction to a direction in which the terminal is located is provided.

本発明の別の態様に関する無線通信システムは、自身の通信圏内において端末の通信を中継可能である２つの通信基地局と、各前記通信基地局を焦点とする楕円形状に形成された反射壁面とを備え、少なくとも一方の前記通信基地局が信号を発信し、前記反射壁面が、一方の前記通信基地局から発信された前記信号を、他方の前記通信基地局へ反射させることを特徴とする。   A wireless communication system according to another aspect of the present invention includes two communication base stations capable of relaying communication of a terminal within its own communication area, and a reflection wall formed in an elliptical shape focusing on each of the communication base stations. And at least one of the communication base stations transmits a signal, and the reflection wall surface reflects the signal transmitted from one of the communication base stations to the other communication base station.

本発明の上記態様によれば、複数の通信基地局を備える無線通信システムにおいて、信号の送信電力を抑えつつ、通信の効率を高めることができる。   According to the above aspect of the present invention, in a wireless communication system including a plurality of communication base stations, it is possible to improve communication efficiency while suppressing signal transmission power.

本発明の実施形態に関する無線通信システムの構成を示す図である。It is a figure which shows the structure of the radio | wireless communications system regarding embodiment of this invention. 無線通信システムにおける通信基地局の構成を概念的に示すブロック図である。It is a block diagram which shows notionally the structure of the communication base station in a radio | wireless communications system. 本発明の実施形態に関する無線通信システムの動作を示すフローチャートである。It is a flowchart which shows operation | movement of the radio | wireless communications system regarding embodiment of this invention. 本発明の実施形態に関する無線通信システムの動作を説明する図である。It is a figure explaining operation | movement of the radio | wireless communications system regarding embodiment of this invention. 本発明の実施形態に関する無線通信システムの構成を示す図である。It is a figure which shows the structure of the radio | wireless communications system regarding embodiment of this invention. 本発明の前提技術に関する無線通信システムの構成を示す図である。It is a figure which shows the structure of the radio | wireless communications system regarding the premise technique of this invention.

以下、添付の図面を参照しながら、本発明の実施形態について説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

まず、本発明の前提技術として、２つの通信基地局による通信領域について説明する。   First, a communication area by two communication base stations will be described as a prerequisite technology of the present invention.

図６は、２つの通信基地局１Ａおよび通信基地局２Ａを備える無線通信システム１００Ａの構成を概略的に示す図である。   FIG. 6 is a diagram schematically showing a configuration of a radio communication system 100A including two communication base stations 1A and 2A.

図６に示されるように無線通信システム１００Ａにおいては、通信基地局１Ａの通信圏１０Ａと、通信基地局２Ａの通信圏２０Ａとが、互いに一部が重なって設定されている。例えば端末７Ｂは通信圏２０Ａ内に位置するので、通信基地局２Ａによってその通信を中継される。   As shown in FIG. 6, in the wireless communication system 100A, the communication area 10A of the communication base station 1A and the communication area 20A of the communication base station 2A are set so as to partially overlap each other. For example, since the terminal 7B is located in the communication area 20A, the communication is relayed by the communication base station 2A.

ここで、通信圏１０Ａと通信圏２０Ａとが重なる領域は、通信基地局１Ａおよび通信基地局２Ａが端末（図示せず）の通信を中継する際のそれぞれの信号（電波）が干渉しうる干渉領域３０となる。   Here, the area where the communication area 10A and the communication area 20A overlap is an interference in which each signal (radio wave) when the communication base station 1A and the communication base station 2A relay communication of a terminal (not shown) may interfere. Region 30 is formed.

一方で、通信基地局１Ａおよび通信基地局２Ａの間の領域であっても、通信圏１０Ａおよび通信圏２０Ａの範囲内に含まれず、各通信基地局が端末７Ａの通信を中継することができない不感領域４０が形成される。図６に示されるような壁面５０に囲まれた空間において無線通信システム１００Ａを構築する場合には、通信圏１０Ａおよび通信圏２０Ａの範囲内に含まれない壁面５０付近の領域が不感領域４０となってしまう。   On the other hand, even in the area between the communication base station 1A and the communication base station 2A, it is not included in the range of the communication area 10A and the communication area 20A, and each communication base station cannot relay the communication of the terminal 7A. A dead area 40 is formed. When the radio communication system 100A is constructed in a space surrounded by the wall surface 50 as shown in FIG. 6, the area near the wall surface 50 that is not included in the communication area 10A and the communication area 20A is the dead area 40. turn into.

上記の干渉領域３０を縮小させるためには通信圏１０Ａおよび通信圏２０Ａをさらに縮小すればよいが、その場合には不感領域４０が拡張されてしまうという問題がある。   In order to reduce the interference area 30, the communication area 10 </ b> A and the communication area 20 </ b> A may be further reduced. In this case, there is a problem that the dead area 40 is expanded.

以下に示す第１実施形態では、特に２つの通信基地局を用いて通信領域を設定する場合に、上記のような問題を解消しつつ信号の送信電力を抑え、通信の効率を高めることができる無線通信システムについて説明する。   In the first embodiment described below, particularly when two communication base stations are used to set a communication area, it is possible to suppress the signal transmission power and improve the communication efficiency while solving the above problems. A wireless communication system will be described.

＜第１実施形態＞
＜構成＞
図１は、本発明の本実施形態に関する無線通信システム１００の構成を概略的に示す図である。 <First Embodiment>
<Configuration>
FIG. 1 is a diagram schematically showing a configuration of a wireless communication system 100 according to this embodiment of the present invention.

図１に示されるように無線通信システム１００は、通信基地局１と、通信基地局２とを備える。   As shown in FIG. 1, the wireless communication system 100 includes a communication base station 1 and a communication base station 2.

通信基地局１は、端末の通信を中継する基地局であるが、自身の基地局情報（周波数情報、帯域幅情報等）を発信する報知領域１５と、端末の通信を中継する領域である通信圏１０とが異なっている。   The communication base station 1 is a base station that relays terminal communication, and is a communication area 15 that transmits its own base station information (frequency information, bandwidth information, etc.) and a communication that relays terminal communication. Different from category 10.

通信基地局２も同様に、端末の通信を中継する基地局であるが、自身の基地局情報を発信する報知領域１５と、端末の通信を中継する領域である通信圏２０とが異なっている。   Similarly, the communication base station 2 is a base station that relays terminal communication, but the notification area 15 that transmits its own base station information is different from the communication area 20 that is an area that relays terminal communication. .

また、通信圏１０と通信圏２０とは互いに重ならず設定されている。   The communication area 10 and the communication area 20 are set so as not to overlap each other.

本実施形態における報知領域１５は、通信基地局１と通信基地局２とを焦点とする楕円形状に設定されており、図１に示されるような壁面５０で囲まれた領域において、空間占有率の高い効率的な形状となっている。なお、報知領域１５の範囲形状は、通信基地局から発信される信号（電波）の各方向における送信電力の調整で実現される。図１に示される両通信基地局を内部に含む楕円形状であれば、楕円線上のある地点における通信基地局１から発信された信号の送信電力値の平方根（正値）と、同じ地点における通信基地局２から発信された信号の送信電力値の平方根（正値）との和が、常に一定となるように調整されることによって実現される（アンテナ利得は一定と仮定）。   The notification area 15 in the present embodiment is set in an elliptical shape with the communication base station 1 and the communication base station 2 as the focal point, and in the area surrounded by the wall surface 50 as shown in FIG. Highly efficient shape. The range shape of the notification area 15 is realized by adjusting the transmission power in each direction of a signal (radio wave) transmitted from the communication base station. In the case of an elliptical shape including both communication base stations shown in FIG. 1, the square root (positive value) of the transmission power value of the signal transmitted from the communication base station 1 at a certain point on the elliptical line and the communication at the same point This is realized by adjusting the sum of the square root (positive value) of the transmission power values of the signals transmitted from the base station 2 to be always constant (assuming that the antenna gain is constant).

本実施形態においては、報知領域１５は、通信基地局１および通信基地局２で共通であるが、両者の報知領域１５は完全に重なっている必要はなく、双方の報知領域を合わせた範囲が、通信圏１０および通信圏２０を覆う範囲であればよい。   In the present embodiment, the notification area 15 is common to the communication base station 1 and the communication base station 2, but the notification areas 15 do not have to be completely overlapped, and there is a range in which both notification areas are combined. Any area that covers the communication area 10 and the communication area 20 may be used.

本実施形態における通信圏１０は、報知領域１５を２等分した左半分に相当する領域であり、本実施形態における通信圏２０は、報知領域１５を２等分した右半分に相当する領域である。すなわち通信圏１０と通信圏２０との境界は、各通信基地局までの距離が等しい。   The communication area 10 in the present embodiment is an area corresponding to the left half of the notification area 15 divided into two, and the communication area 20 in the present embodiment is an area corresponding to the right half of the notification area 15 divided in two. is there. That is, the boundary between the communication area 10 and the communication area 20 has the same distance to each communication base station.

報知領域１５における通信圏１０および通信圏２０の分割の仕方は、図示されるような場合に限らないが、端末の位置が通信基地局から離れるほど、通信を中継するために必要となる送信電力が増加することを考慮すると、各通信基地局から送信された信号の送信電力が等しい境界で、通信圏１０と通信圏２０とを分割することが望ましい。各通信基地局から信号が送信される際に消費される送信電力に偏りが生じないようにするためである。   The method of dividing the communication area 10 and the communication area 20 in the notification area 15 is not limited to the case shown in the figure, but the transmission power necessary for relaying communication as the position of the terminal is further away from the communication base station. In consideration of the increase in the communication area 10, it is desirable to divide the communication area 10 and the communication area 20 at boundaries where the transmission powers of the signals transmitted from the respective communication base stations are equal. This is to prevent the transmission power consumed when signals are transmitted from each communication base station from being biased.

次に、無線通信システム１００における各通信基地局の構成について説明する。図２は、無線通信システム１００における通信基地局１の構成を概念的に示すブロック図である。   Next, the configuration of each communication base station in the wireless communication system 100 will be described. FIG. 2 is a block diagram conceptually showing the configuration of the communication base station 1 in the wireless communication system 100.

図２に示されるように通信基地局１は、報知部１１と、受信部１２と、送信部１３と、判定部１４とを備える。ここで、受信部１２と送信部１３とは、概念的に分けて記載しているものであり、１つの機能部（通信部）で実現されるものであってもよい。   As illustrated in FIG. 2, the communication base station 1 includes a notification unit 11, a reception unit 12, a transmission unit 13, and a determination unit 14. Here, the receiving unit 12 and the transmitting unit 13 are described conceptually separately, and may be realized by one functional unit (communication unit).

報知部１１は、通信基地局１の基地局情報を報知（発信）する機能部である。基地局情報の報知は報知領域１５において行われる。   The notification unit 11 is a functional unit that notifies (transmits) base station information of the communication base station 1. The notification of the base station information is performed in the notification area 15.

受信部１２は、端末または他の通信基地局からの信号を受信する機能部である。   The receiving unit 12 is a functional unit that receives a signal from a terminal or another communication base station.

送信部１３は、端末または他の通信基地局へ信号を送信する機能部である。   The transmission unit 13 is a functional unit that transmits a signal to a terminal or another communication base station.

判定部１４は、端末の位置が自身の通信圏内に含まれるか否かを判定する機能部である。判定方法については後述する。   The determination unit 14 is a functional unit that determines whether the position of the terminal is included in its own communication range. The determination method will be described later.

通信基地局１が端末の通信を中継する場合には、受信部１２および送信部１３が動作し、端末と通信基地局との間の通信を可能とする。   When the communication base station 1 relays the communication of the terminal, the reception unit 12 and the transmission unit 13 operate to enable communication between the terminal and the communication base station.

なお、通信基地局２の構成も上記の通信基地局１における構成と同様である。   The configuration of the communication base station 2 is the same as that of the communication base station 1 described above.

＜動作＞
次に、図１〜図４を参照しつつ、本発明の本実施形態に関する無線通信システム１００の動作を説明する。図３は、無線通信システム１００の動作を示すフローチャートである。また図４は、無線通信システム１００の動作を説明する図である。 <Operation>
Next, the operation of the wireless communication system 100 according to this embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a flowchart showing the operation of the wireless communication system 100. FIG. 4 is a diagram for explaining the operation of the wireless communication system 100.

まず、図３に示されるように無線通信システム１００において、各通信基地局の報知部１１が、報知領域１５に基地局情報を発信する（ステップＳ１）。当該基地局情報の発信（報知）は、例えばＰＢＣＨ（Ｐｈｙｓｉｃａｌ Ｂｒｏａｄｃａｓｔ Ｃｈａｎｎｅｌ）や、ＰＤＳＣＨ（Ｐｈｙｓｉｃａｌ Ｄｏｗｎｌｉｎｋ Ｓｈａｒｅｄ Ｃｈａｎｎｅｌ）で行われる。   First, as shown in FIG. 3, in the radio communication system 100, the notification unit 11 of each communication base station transmits base station information to the notification area 15 (step S1). The transmission (notification) of the base station information is performed by, for example, PBCH (Physical Broadcast Channel) or PDSCH (Physical Downlink Shared Channel).

各通信基地局の報知部１１が発信する基地局情報は異なっており、また、基地局毎に、データのスクランブル系列、Ｒｅｆｅｒｅｎｃｅ Ｓｉｇｎａｌ（復調に用いるシンボル系列）の生成や、報知情報の周波数リソース位置が異なっている。よって、基地局情報の報知が干渉してしまうことは回避できる。   The base station information transmitted from the notification unit 11 of each communication base station differs, and for each base station, generation of a data scramble sequence, reference signal (symbol sequence used for demodulation), and frequency resource position of broadcast information Is different. Therefore, it is possible to avoid interference of notification of base station information.

次に、例えば端末７Ａおよび端末７Ｂが、その基地局情報を受信する（ステップＳ２）。   Next, for example, the terminal 7A and the terminal 7B receive the base station information (step S2).

次に、端末７Ａおよび端末７Ｂが、無線通信システム１００内の通信基地局へ、少なくとも端末の位置情報を含む信号を送信する（ステップＳ３）。   Next, terminal 7A and terminal 7B transmit a signal including at least the position information of the terminal to the communication base station in radio communication system 100 (step S3).

次に、無線通信システム１００において、通信基地局の受信部１２が、端末からの信号を受信し、さらに通信基地局の判定部１４が、自身の通信圏内に当該端末が含まれるか否かを判定する（ステップＳ４）。   Next, in the wireless communication system 100, the receiving unit 12 of the communication base station receives a signal from the terminal, and the determining unit 14 of the communication base station determines whether or not the terminal is included in its communication range. Determine (step S4).

当該判定は、例えば、端末の位置情報から各通信基地局までの距離を算出し、その距離が最も短い通信基地局が自身の通信基地局であるか否かで判定したり、端末の位置情報から当該位置に信号を送信するための各通信基地局における送信電力を算出し、その電力値が最も小さい通信基地局が自身の通信基地局であるか否かで判定したりすることができる。   For example, the determination may be based on whether the communication base station with the shortest distance is its own communication base station by calculating the distance from the terminal position information to each communication base station, The transmission power in each communication base station for transmitting a signal to the position can be calculated, and it can be determined whether or not the communication base station having the smallest power value is its own communication base station.

判定部１４が、端末が自身の通信圏内に位置していると判定した場合（ＹＥＳ）にはステップＳ５へ進む。一方で、判定部１４が、端末が自身の通信圏内に位置していないと判定した場合（ＮＯ）にはステップＳ１へ戻り、基地局情報の発信（報知）を継続する。   If the determination unit 14 determines that the terminal is located within its own communication range (YES), the process proceeds to step S5. On the other hand, when the determination unit 14 determines that the terminal is not located within its own communication range (NO), the process returns to step S1 and continues transmission (notification) of base station information.

次に、無線通信システム１００において、自身の通信圏内に端末が位置している通信基地局が、当該端末の通信の中継を開始する（ステップＳ５）。   Next, in the wireless communication system 100, the communication base station in which the terminal is located within its own communication range starts relaying communication of the terminal (step S5).

このとき、例えば通信基地局２の送信部１３は、自身の通信圏２０内の端末７Ｂが位置していることが分かっている方向に範囲を限定して、端末の通信を中継する信号（電波）を送信する（図４参照）。   At this time, for example, the transmission unit 13 of the communication base station 2 limits the range to the direction in which the terminal 7B in the communication area 20 of the communication base station 20 is located and relays the terminal communication (radio wave). ) Is transmitted (see FIG. 4).

このように信号の送信方向を端末の位置する方向に限定することによって、信号の送信方向を限定せずに放射状に送信する場合に比べて、同じ送信電力でより遠くまで信号を送信することができる。一般に、基地局情報として発信される情報量に比べ、端末間で通信される情報量は大きいものとなり、同じ送信電力での通信圏はその分制限されてしまうが、送信方向を限定することによって、結果として通信圏を拡張させることができ、例えば図６に示された各通信基地局の通信圏１０Ａおよび通信圏２０Ａに比べて、図１および図４に示された通信圏１０および通信圏２０は広い領域として設定することができる。   By limiting the signal transmission direction to the direction in which the terminal is located in this way, it is possible to transmit a signal farther with the same transmission power than when transmitting the signal radially without limiting the signal transmission direction. it can. Generally, the amount of information communicated between terminals is larger than the amount of information transmitted as base station information, and the communication area with the same transmission power is limited accordingly, but by limiting the transmission direction As a result, the communication area can be expanded. For example, compared with the communication area 10A and the communication area 20A of each communication base station illustrated in FIG. 6, the communication area 10 and the communication area illustrated in FIGS. 20 can be set as a wide area.

通信圏が拡張することにより、図６においては不感領域４０に位置していた端末７Ａであっても、図４においては通信圏２０の範囲内に位置することとなり、通信基地局２は、端末７Ａの通信を中継することができる。すなわち、不感領域を縮小させることができる。   Due to the expansion of the communication area, even the terminal 7A located in the dead area 40 in FIG. 6 is located within the communication area 20 in FIG. 7A communication can be relayed. That is, the dead area can be reduced.

また、自身の通信圏内に対象となる端末が位置している通信基地局だけが端末の通信を中継することとなり、干渉領域が生じることも抑制することができる。   Further, only the communication base station in which the target terminal is located within its own communication area relays the terminal communication, and the occurrence of an interference region can also be suppressed.

＜効果＞
本発明に関する実施形態によれば、無線通信システム１００は、自身の通信圏内において端末の通信を中継する通信基地局１および通信基地局２を備える。各通信基地局の通信圏は、互いに重ならず設定される。 <Effect>
According to the embodiment of the present invention, the wireless communication system 100 includes a communication base station 1 and a communication base station 2 that relay communication of a terminal within its communication range. The communication areas of the respective communication base stations are set so as not to overlap each other.

各通信基地局は、通信圏１０および通信圏２０に亘る報知領域１５に、自身の基地局情報を報知する報知部１１と、基地局情報を受信した端末から、当該端末の位置情報を受信する受信部１２と、端末の位置情報に基づいて、端末の位置が自身の通信圏に含まれるか否かを判定する判定部１４と、端末の位置が自身の通信圏に含まれる場合、当該端末の位置する方向に信号送信方向を限定して当該端末の通信を中継する信号を送信する送信部１３とを備える。   Each communication base station receives the location information of the terminal from the notification unit 11 that reports its own base station information to the notification region 15 that covers the communication range 10 and the communication range 20 and the terminal that has received the base station information. If the receiving unit 12, the determining unit 14 that determines whether or not the terminal position is included in its own communication area based on the terminal position information, and the terminal position is included in its own communication area, the terminal The transmission unit 13 transmits a signal for relaying communication of the terminal by limiting the signal transmission direction to the direction in which the terminal is located.

このような無線通信システムによれば、報知領域１５において不感領域が形成されることを抑制することができる。また、通信圏１０および通信圏２０が重ならないように設定されるため、干渉領域が形成されることを抑制することができる。よって、無線通信システムにおける通信の効率を高めることができる。   According to such a wireless communication system, it is possible to suppress the formation of a dead area in the notification area 15. In addition, since the communication area 10 and the communication area 20 are set so as not to overlap, it is possible to suppress the formation of an interference region. Thus, communication efficiency in the wireless communication system can be increased.

また、端末の位置する方向に信号送信方向を限定して信号を送信することによって、信号の送信方向を限定しない場合に比べて、通信圏を拡張させることができる。よって、不感領域であった領域が通信圏内に位置するようになり、送信電力を抑えつつ、不感領域を縮小させることができる。   Further, by transmitting a signal by limiting the signal transmission direction to the direction in which the terminal is located, the communication area can be expanded as compared with the case where the signal transmission direction is not limited. Therefore, the area that was the insensitive area comes to be located in the communication area, and the insensitive area can be reduced while suppressing the transmission power.

また、本発明に関する実施形態によれば、報知部１１が、通信基地局１および通信基地局２を焦点とする楕円形状である報知領域１５に、自身の基地局情報を報知する。   Further, according to the embodiment of the present invention, the notification unit 11 reports its own base station information to the notification area 15 that is elliptical with the communication base station 1 and the communication base station 2 as the focus.

このような無線通信システムによれば、空間占有率の高い報知領域１５を設定でき、不感領域の形成を抑制することができる。   According to such a wireless communication system, it is possible to set the notification area 15 having a high space occupancy rate and to suppress the formation of a dead area.

また、本発明に関する実施形態によれば、通信圏１０および通信圏２０が、通信基地局１および通信基地局２までの距離が等しい境界で報知領域１５を分割した領域である。   Further, according to the embodiment related to the present invention, the communication area 10 and the communication area 20 are areas obtained by dividing the notification area 15 at boundaries where the distances to the communication base station 1 and the communication base station 2 are equal.

このような無線通信システムによれば、各通信基地局が担当する通信圏を均等に設定することができ、通信効率が高まる。   According to such a wireless communication system, the communication area handled by each communication base station can be set evenly, and communication efficiency increases.

また、本発明に関する実施形態によれば、通信圏１０および通信圏２０が、通信基地局１および通信基地局２から送信された信号の送信電力が等しい境界で報知領域１５を分割した領域である。   Further, according to the embodiment of the present invention, the communication area 10 and the communication area 20 are areas obtained by dividing the notification area 15 at boundaries where the transmission powers of the signals transmitted from the communication base station 1 and the communication base station 2 are equal. .

このような無線通信システムによれば、通信圏内に信号を送信するための上限となる送信電力が各通信基地局で調整され、一方の通信基地局における消費送信電力が極端に大きくなることを防ぐことができる。   According to such a wireless communication system, the transmission power that is the upper limit for transmitting a signal within the communication range is adjusted in each communication base station, and the transmission power consumed in one communication base station is prevented from becoming extremely large. be able to.

＜第２実施形態＞
図６に示された無線通信システム１００Ａにおいて、端末が例えば通信圏１０Ａから通信圏２０Ａに移動した場合、通信の中継に利用する通信基地局１Ａから通信基地局２Ａへ切り替える動作（ハンドオーバー）を行う必要がある。 Second Embodiment
In the wireless communication system 100A shown in FIG. 6, for example, when the terminal moves from the communication area 10A to the communication area 20A, an operation (handover) for switching from the communication base station 1A used for communication relay to the communication base station 2A is performed. There is a need to do.

当該切り替え動作に伴って、通信基地局１Ａから通信基地局２Ａへ、端末に関する情報（周波数情報、ＩＰ情報等）が転送される。当該転送には、通信基地局１Ａから通信基地局２Ａへ向かう方向に信号（電波）が発信される必要があるが、信号が通信基地局１Ａから放射状に発信される場合には、通信基地局２Ａへ到達しない信号が存在し通信効率がよくなかった。   Along with the switching operation, information (frequency information, IP information, etc.) regarding the terminal is transferred from the communication base station 1A to the communication base station 2A. For the transfer, a signal (radio wave) needs to be transmitted in a direction from the communication base station 1A to the communication base station 2A. When the signal is transmitted radially from the communication base station 1A, the communication base station There was a signal that did not reach 2A, and the communication efficiency was not good.

以下に示す第２実施形態ではこのような問題点を鑑みて、特に２つの通信基地局を用いて通信領域を設定する場合に、通信基地局間の一般的な通信効率を高めることができる無線通信システムについて説明する。   In the second embodiment described below, in view of such a problem, particularly in the case where a communication area is set using two communication base stations, wireless communication that can improve general communication efficiency between the communication base stations. A communication system will be described.

＜構成＞
図５は、本発明の本実施形態に関する無線通信システム１０１の構成を概略的に示す図である。 <Configuration>
FIG. 5 is a diagram schematically showing the configuration of the wireless communication system 101 according to the present embodiment of the present invention.

図５に示されるように無線通信システム１０１は、通信基地局３と、通信基地局４と、楕円形状の反射壁面５とを備える。   As shown in FIG. 5, the wireless communication system 101 includes a communication base station 3, a communication base station 4, and an elliptical reflecting wall surface 5.

通信基地局３および通信基地局４は、それぞれ図示しない通信圏を有している。通信基地局３および通信基地局４は、それぞれの通信圏において端末の通信を中継することができる。   Each of the communication base station 3 and the communication base station 4 has a communication area (not shown). The communication base station 3 and the communication base station 4 can relay terminal communication in their communication areas.

上述したように、例えば通信基地局３の通信圏から通信基地局４の通信圏へ端末が移動した場合には、端末の通信を中継する通信基地局は通信基地局３から通信基地局４へ切り替えられ（ハンドオーバー）、それに伴って、通信基地局３から通信基地局４へ、ハンドオーバーした端末に関する情報（周波数情報、ＩＰ情報等）が転送される。なお、通信基地局４から通信基地局３へ切り替えられる場合（逆の場合）であってもよい。   As described above, for example, when a terminal moves from the communication area of the communication base station 3 to the communication area of the communication base station 4, the communication base station that relays communication of the terminal moves from the communication base station 3 to the communication base station 4. As a result of switching (handover), information (frequency information, IP information, etc.) relating to the handed over terminal is transferred from the communication base station 3 to the communication base station 4. In addition, the case where it switches from the communication base station 4 to the communication base station 3 (the reverse case) may be sufficient.

反射壁面５は、通信基地局３および通信基地局４それぞれを焦点とする略楕円形状に形成された壁面である。図５に示されるような理想的な楕円形状に形成されていることが望ましいが、通信基地局３および通信基地局４を囲むビルの外壁の組み合わせや、通信基地局３および通信基地局４を内部に備えるコンサートホールの内壁によって、近似的に当該形状が実現される場合であってもよい。   The reflection wall surface 5 is a wall surface formed in a substantially elliptical shape with the communication base station 3 and the communication base station 4 as focal points. It is desirable to form an ideal oval shape as shown in FIG. 5, but the combination of the outer wall of the building surrounding the communication base station 3 and the communication base station 4, and the communication base station 3 and the communication base station 4 The shape may be approximately realized by the inner wall of the concert hall provided inside.

また反射壁面５は、通信基地局３および通信基地局４から発信される信号が到達し、適切に反射するように形成されている。言い換えれば、通信基地局３および通信基地局４から発信される信号の送信電力は、反射壁面５において適切な反射が生じる程度以上の値に設定されている。   The reflection wall surface 5 is formed so that signals transmitted from the communication base station 3 and the communication base station 4 can reach and be reflected appropriately. In other words, the transmission power of the signals transmitted from the communication base station 3 and the communication base station 4 is set to a value that is more than enough to cause appropriate reflection on the reflection wall surface 5.

無線通信システム１０１において上記の切り替え動作（ハンドオーバー）が行われる場合には、通信基地局３から放射状に発信された信号が、一部は直接通信基地局４に到達するが、大部分は反射壁面５に到達する。   When the above switching operation (handover) is performed in the wireless communication system 101, some of the signals transmitted radially from the communication base station 3 reach the communication base station 4 directly, but most of them are reflected. The wall 5 is reached.

ここで反射壁面５は、通信基地局３および通信基地局４を焦点とする楕円形状に形成されているため、一方の焦点に位置する通信基地局３から発信された信号１６および信号１７は反射壁面５において反射し、他方の焦点に位置する通信基地局４へ向かう方向にその進行方向が変更される（図５参照）。   Here, since the reflection wall surface 5 is formed in an elliptical shape with the communication base station 3 and the communication base station 4 as the focal point, the signal 16 and the signal 17 transmitted from the communication base station 3 located at one focal point are reflected. The traveling direction is changed in a direction toward the communication base station 4 which is reflected on the wall surface 5 and located at the other focal point (see FIG. 5).

よって、直接的に通信基地局４へ向かう信号以外に信号１６および信号１７についても、効率的に通信基地局４へ到達させることができ、通信基地局間の通信効率を高めることができる。   Therefore, the signal 16 and the signal 17 other than the signal directed directly to the communication base station 4 can also be efficiently reached to the communication base station 4, and the communication efficiency between the communication base stations can be increased.

＜変形例＞
上記の実施形態において、通信基地局３および通信基地局４のいずれかが、他方の通信基地局からの信号を中継することによって間接的に端末の通信を中継する機能を有する通信基地局であってもよい。 <Modification>
In the above embodiment, either the communication base station 3 or the communication base station 4 is a communication base station having a function of relaying terminal communication indirectly by relaying a signal from the other communication base station. May be.

＜効果＞
本発明に関する実施形態によれば、無線通信システム１０１は、自身の通信圏内において端末の通信を中継可能である２つの通信基地局３および通信基地局４と、各通信基地局を焦点とする楕円形状に形成された反射壁面５とを備える。 <Effect>
According to the embodiment of the present invention, the wireless communication system 101 includes two communication base stations 3 and 4 that can relay the communication of a terminal within its communication range, and an ellipse that focuses on each communication base station. And a reflecting wall surface 5 formed in a shape.

そして無線通信システム１０１は、少なくとも一方の通信基地局３が信号を発信し、反射壁面５が、一方の通信基地局３から発信された信号を、他方の通信基地局４へ反射させる。   In the wireless communication system 101, at least one communication base station 3 transmits a signal, and the reflection wall surface 5 reflects the signal transmitted from one communication base station 3 to the other communication base station 4.

このような無線通信システム１０１によれば、直接的に通信基地局４へ向かう信号以外に信号１６および信号１７についても、効率的に通信基地局４へ到達させることができ、通信基地局間の通信効率を高めることができる。よって、電力消費も抑制できる。   According to such a wireless communication system 101, the signal 16 and the signal 17 can be efficiently reached to the communication base station 4 in addition to the signal directed directly to the communication base station 4. Communication efficiency can be increased. Therefore, power consumption can also be suppressed.

なお本発明は、その発明の範囲内において、各実施形態の自由な組み合わせ、あるいは各実施形態の任意の構成要素の変形、もしくは各実施形態において任意の構成要素の省略が可能である。   In addition, within the scope of the present invention, the present invention can be freely combined with each embodiment, modified with any component in each embodiment, or omitted with any component in each embodiment.

１，１Ａ，２，２Ａ，３，４ 通信基地局、５ 反射壁面、７Ａ，７Ｂ 端末、１０，１０Ａ，２０，２０Ａ 通信圏、１１ 報知部、１２ 受信部、１３ 送信部、１４ 判定部、１５ 報知領域、１６，１７ 信号、３０ 干渉領域、４０ 不感領域、５０ 壁面、１００，１００Ａ，１０１ 無線通信システム。   1, 1A, 2, 2A, 3, 4 Communication base station, 5 Reflecting wall surface, 7A, 7B terminal, 10, 10A, 20, 20A Communication area, 11 Notification unit, 12 Receiving unit, 13 Transmitting unit, 14 Determination unit, 15 broadcast area, 16, 17 signal, 30 interference area, 40 dead area, 50 wall surface, 100, 100A, 101 wireless communication system.

Claims (5)

自身の通信圏内において端末の通信を中継する複数の通信基地局を備え、
各前記通信基地局の前記通信圏は、互いに重ならず設定され、
各前記通信基地局が、
複数の前記通信基地局の前記通信圏に亘る報知領域に、自身の基地局情報を報知する報知部と、
前記基地局情報を受信した前記端末から、当該端末の位置情報を受信する受信部と、
前記端末の前記位置情報に基づいて、前記端末の位置が自身の前記通信圏に含まれるか否かを判定する判定部と、
前記端末の位置が自身の前記通信圏に含まれる場合、当該端末の位置する方向に信号送信方向を限定して当該端末の通信を中継する信号を送信する送信部とを備えることを特徴とする、
無線通信システム。 Provided with a plurality of communication base stations that relay the communication of the terminal in its communication range,
The communication areas of the communication base stations are set so as not to overlap each other,
Each of the communication base stations
An informing unit that informs its own base station information in an informing area over the communication area of a plurality of the communication base stations,
A receiving unit that receives position information of the terminal from the terminal that has received the base station information;
A determination unit that determines whether or not the position of the terminal is included in the communication area of the terminal based on the position information of the terminal;
When the position of the terminal is included in the communication range of the terminal, a transmission unit that transmits a signal that relays communication of the terminal by limiting a signal transmission direction to a direction in which the terminal is located is provided. ,
Wireless communication system. 前記報知部が、各前記通信基地局を焦点とする楕円形状である前記報知領域に、自身の基地局情報を報知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 notification unit is configured to notify the base station information of the base station information to the notification area, which has an elliptical shape with each communication base station as a focus.
The wireless communication system according to claim 1. 各前記通信基地局の前記通信圏が、各前記通信基地局までの距離が等しい境界で前記報知領域を分割した領域であ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 communication area of each of the communication base stations is an area obtained by dividing the notification area at a boundary where the distance to each of the communication base stations is equal.
The wireless communication system according to claim 1 or 2. 各前記通信基地局の前記通信圏が、各前記通信基地局から送信された信号の送信電力が等しい境界で前記報知領域を分割した領域であることを特徴とする、
請求項１〜３のいずれかに記載の無線通信システム。 The communication area of each communication base station is a region obtained by dividing the notification region at a boundary where transmission power of signals transmitted from the communication base stations is equal.
The radio | wireless communications system in any one of Claims 1-3. 自身の通信圏内において端末の通信を中継可能である２つの通信基地局と、
各前記通信基地局を焦点とする楕円形状に形成された反射壁面とを備え、
少なくとも一方の前記通信基地局が信号を発信し、
前記反射壁面が、一方の前記通信基地局から発信された前記信号を、他方の前記通信基地局へ反射させることを特徴とする、
無線通信システム。 Two communication base stations capable of relaying the communication of the terminal within its communication range;
A reflective wall formed in an elliptical shape with each communication base station as a focal point,
At least one of the communication base stations transmits a signal;
The reflection wall surface reflects the signal transmitted from one of the communication base stations to the other communication base station,
Wireless communication system.
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