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JP2007129405A - Wireless communication system and wireless communication control method - Google Patents

Wireless communication system and wireless communication control method Download PDF

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JP2007129405A
JP2007129405A JP2005319291A JP2005319291A JP2007129405A JP 2007129405 A JP2007129405 A JP 2007129405A JP 2005319291 A JP2005319291 A JP 2005319291A JP 2005319291 A JP2005319291 A JP 2005319291A JP 2007129405 A JP2007129405 A JP 2007129405A
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wireless communication
communication system
cell
base station
radio base
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JP4708162B2 (en
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Kosuke Yamazaki
浩輔 山崎
Takeya Yonezawa
健也 米澤
Kazunori Tani
和記 谷
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KDDI Corp
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Abstract

【課題】広域セル方式とピコセル方式を単一の無線通信システムで実現する。
【解決手段】特定の無線通信方式の無線接続サービスエリアを提供する広域セル１００と、広域セル１００と同じ無線通信方式の無線接続サービスエリアであって広域セル１００よりも小さい無線接続サービスエリアを提供するピコセル２００とを重なり合うように配置し、前記各セル１００，２００を形成するための無線基地局１，２が同時に同じ周波数帯を利用可能なように制御する制御手段を備える。
【選択図】図１
A wide area cell system and a pico cell system are realized by a single wireless communication system.
A wide area cell that provides a wireless connection service area of a specific wireless communication system, and a wireless connection service area that is the same wireless communication system as the wide area cell and is smaller than the wide area cell. And a control unit that controls the radio base stations 1 and 2 for forming the cells 100 and 200 so that the same frequency band can be used simultaneously.
[Selection] Figure 1

Description

本発明は、無線通信システム及び無線通信制御方法に関する。   The present invention relates to a wireless communication system and a wireless communication control method.

従来より、無線接続サービスにおいて広域をカバーする広域セル方式の無線通信システムが知られている。その広域セル方式の無線通信システムの運用においては、単一のシステムを多数のユーザで共用することから、所望のネットワーク性能が得られない場合がある。また、多数のユーザからの負荷が少数の基地局にかかるために、基地局の処理能力がボトルネックとなる可能性がある。さらに、ビル影や屋内などに局所的に生じた電波の不感地帯に対して、干渉を抑制しながら対処するには、セルサイズが広大すぎる、基地局の設置コストが高い等の問題点がある。   2. Description of the Related Art Conventionally, a wide area cellular radio communication system that covers a wide area in a wireless connection service is known. In the operation of the wide-area wireless communication system, desired network performance may not be obtained because a single system is shared by many users. In addition, since the load from a large number of users is applied to a small number of base stations, the processing capability of the base stations may become a bottleneck. Furthermore, there are problems such as the cell size being too large and the base station installation cost being high in order to cope with the insensitive areas of radio waves generated locally in the shadows of buildings and indoors while suppressing interference. .

それらの問題点に対処するための一方式として、広域セルよりも小さなピコセルを用いるピコセル方式が知られている。そのピコセル方式においては、上記電波の不感地帯にピコセルを配置することにより、サービスエリアの面的な拡張を低コストで実現することができる。また、通信トラヒックの高い場所にピコセルを配置することにより、ユーザからの負荷をピコセル基地局へ分散させることが可能となる。ピコセル方式を実現する従来のシステムとしては、セルラシステム、無線ＬＡＮシステム、成層圏プラットホーム等の異なる複数の無線通信システムを構築し、又、それら複数の無線通信システムの端末機能を有する無線端末を準備し、該無線端末が適宜接続する無線通信システムを切り替えるものが知られている（例えば、特許文献１参照）。例えば、広域セル方式の無線通信システムとしてセルラシステムを構築し、ピコセル方式の無線通信システムとして無線ＬＡＮシステムを構築する。
特開２００３−８７２７２号公報 As one method for dealing with these problems, a pico cell method using a pico cell smaller than a wide area cell is known. In the pico cell system, the service area can be expanded at low cost by arranging the pico cell in the radio wave insensitive zone. Also, by placing the pico cell in a place with high communication traffic, it is possible to distribute the load from the user to the pico cell base stations. As a conventional system for realizing the picocell system, a plurality of different wireless communication systems such as a cellular system, a wireless LAN system, and a stratosphere platform are constructed, and wireless terminals having terminal functions of the plurality of wireless communication systems are prepared. There is known one that switches a wireless communication system to which the wireless terminal is connected as appropriate (see, for example, Patent Document 1). For example, a cellular system is constructed as a wide area cellular radio communication system, and a wireless LAN system is constructed as a pico cell radio communication system.
JP 2003-87272 A

しかし、上述したピコセル方式を実現する従来のシステムでは、広域セル方式とピコセル方式ではそれぞれ無線通信システムが異なるので、無線端末は複数の無線通信システムに対応しなければならず、端末コストや消費電力の増大といった問題が生じる。また、異なる無線通信システム間のハンドオーバ時には、単一の無線通信システム間のハンドオーバ時に比べて処理が複雑になる等のシステムにかかる負荷の増大も懸念される。   However, in the conventional system that realizes the above-described picocell system, the radio communication system differs between the wide-area cell system and the picocell system, so the radio terminal must support a plurality of radio communication systems, and the terminal cost and power consumption There arises a problem such as an increase in. In addition, there is a concern about an increase in load on the system, such as a more complicated process at the time of handover between different wireless communication systems than at the time of handover between single wireless communication systems.

本発明は、このような事情を考慮してなされたもので、その目的は、広域セル方式とピコセル方式を、その無線接続サービスエリアが重なり合った環境においても、干渉を回避もしくは軽減しつつ、単一の無線通信システムで実現することのできる無線通信システム及び無線通信制御方法を提供することにある。   The present invention has been made in view of such circumstances, and the object of the present invention is to use a wide-area cell system and a pico-cell system while avoiding or reducing interference even in an environment where the wireless connection service areas overlap. An object of the present invention is to provide a wireless communication system and a wireless communication control method that can be realized by a single wireless communication system.

上記の課題を解決するために、本発明に係る無線通信システムは、特定の無線通信方式の無線接続サービスエリアを提供する広域セルと、前記広域セルと同じ無線通信方式の無線接続サービスエリアであって前記広域セルよりも小さい無線接続サービスエリアを提供するピコセルとを重なり合うように配置し、前記各セルを形成するための無線基地局が同時に同じ周波数帯を利用可能なように制御する制御手段を備えたことを特徴とする。   In order to solve the above problems, a wireless communication system according to the present invention includes a wide area cell that provides a wireless connection service area of a specific wireless communication system, and a wireless connection service area of the same wireless communication system as the wide area cell. And a control means for controlling so that the radio base stations for forming each cell can use the same frequency band at the same time, arranged so as to overlap with a pico cell that provides a wireless connection service area smaller than the wide area cell. It is characterized by having.

本発明に係る無線通信システムにおいては、前記制御手段は、前記各セルにおける干渉状況に基づき、前記各無線基地局が使用する周波数チャネル又は前記各無線基地局の送信電力を調整することを特徴とする。   In the radio communication system according to the present invention, the control means adjusts a frequency channel used by each radio base station or a transmission power of each radio base station based on an interference situation in each cell. To do.

本発明に係る無線通信システムにおいては、前記周波数チャネル又は前記送信電力を集中的に制御する集中制御局を備えたことを特徴とする。   The radio communication system according to the present invention includes a central control station that centrally controls the frequency channel or the transmission power.

本発明に係る無線通信システムにおいては、前記各無線基地局において自律分散的に周波数チャネル又は送信電力を制御する手段を備えたことを特徴とする。   The radio communication system according to the present invention is characterized in that each radio base station includes means for controlling frequency channels or transmission power in an autonomous and distributed manner.

本発明に係る無線通信システムにおいては、前記干渉状況を集中的に把握する集中制御局と、前記各無線基地局において自律分散的に周波数チャネル又は送信電力を制御する手段と、を備えたことを特徴とする。   The radio communication system according to the present invention includes a centralized control station that centrally grasps the interference state, and means for controlling frequency channels or transmission power in an autonomous and distributed manner in each of the radio base stations. Features.

本発明に係る無線通信システムにおいては、前記干渉状況を集中的に把握するとともに、前記周波数チャネルを集中的に制御する集中制御局と、前記各無線基地局において自律分散的に送信電力を制御する手段と、を備えたことを特徴とする。   In the radio communication system according to the present invention, the interference state is intensively grasped, and the transmission power is controlled in an autonomous and distributed manner in a centralized control station that centrally controls the frequency channel and each radio base station. Means.

本発明に係る無線通信制御方法は、特定の無線通信方式の無線接続サービスエリアを提供する広域セルと、前記広域セルと同じ無線通信方式の無線接続サービスエリアであって前記広域セルよりも小さい無線接続サービスエリアを提供するピコセルとを重なり合うように配置した無線通信システムにおける無線通信制御方法であって、前記各セルを形成するための無線基地局が同時に同じ周波数帯を利用可能なように制御する制御過程を有することを特徴とする。   The wireless communication control method according to the present invention includes a wide area cell that provides a wireless connection service area of a specific wireless communication system, a wireless connection service area of the same wireless communication system as the wide area cell, and a wireless that is smaller than the wide area cell. A wireless communication control method in a wireless communication system in which a pico cell providing a connection service area is arranged so as to overlap with each other, wherein the wireless base stations for forming each cell are controlled so that the same frequency band can be used simultaneously. It has a control process.

本発明によれば、広域セル方式とピコセル方式を、その無線接続サービスエリアが重なり合った環境においても、干渉を回避もしくは軽減しつつ、単一の無線通信システムで実現することができる。   According to the present invention, it is possible to realize a wide area cell system and a pico cell system in a single wireless communication system while avoiding or reducing interference even in an environment where the wireless connection service areas overlap.

以下、図面を参照し、本発明の一実施形態について説明する。
図１は、本発明の一実施形態に係る無線通信システムの全体構成を示す図である。図１において、広域セル基地局１は、特定の無線通信方式の無線接続サービスエリアを提供する広域セル１００を形成する。小型無線基地局２（ピコセル基地局）は、広域セル１００と同じ無線通信方式の無線接続サービスエリアであって、広域セル１００よりも小さい無線接続サービスエリアを提供するピコセル２００を形成する。小型無線基地局２は、ユーザ宅等の任意の場所に、例えばユーザ自身が設置することができる。広域セル基地局１及び小型無線基地局２は、共に本無線通信システムの基地局装置であって、同一の無線通信システムの無線基地局機能を有する。従って、本無線通信システムの無線端末装置である移動局装置３は、唯一の無線通信システムの端末機能を有するのみで、広域セル基地局１及び小型無線基地局２の双方に無線接続することができる。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing an overall configuration of a wireless communication system according to an embodiment of the present invention. In FIG. 1, a wide area cell base station 1 forms a wide area cell 100 that provides a wireless connection service area of a specific wireless communication system. The small radio base station 2 (picocell base station) forms a picocell 200 that is a radio connection service area of the same radio communication scheme as the wide area cell 100 and provides a smaller radio connection service area than the wide area cell 100. The small radio base station 2 can be installed, for example, by the user himself / herself in an arbitrary place such as a user's house. The wide-area cell base station 1 and the small radio base station 2 are both base station apparatuses of the present radio communication system and have the radio base station function of the same radio communication system. Accordingly, the mobile station device 3 which is a wireless terminal device of the present wireless communication system has only the terminal function of the wireless communication system, and can wirelessly connect to both the wide-area cell base station 1 and the small wireless base station 2. it can.

集中制御局４は、各小型無線基地局２に通信接続されている。広域セル基地局１及び集中制御局４は、公衆網５にそれぞれ通信接続されている。   The central control station 4 is communicatively connected to each small radio base station 2. The wide-area cell base station 1 and the central control station 4 are connected to a public network 5 for communication.

図１に示されるように、広域セル１００とピコセル２００とは重なり合って配置されている。その重なり方は、広域セル１００内に、ピコセル２００全体が包含されてもよく、或いはピコセル２００が部分的に包含されてもよい。また、ピコセル２００同士が重なり合って配置されてもよい。また、広域セル１００内に配置するピコセル２００は、一つであってもよく、或いは複数であってもよい。   As shown in FIG. 1, the wide area cell 100 and the pico cell 200 are arranged so as to overlap each other. In the overlapping method, the entire pico cell 200 may be included in the wide area cell 100, or the pico cell 200 may be partially included. Further, the pico cells 200 may be arranged so as to overlap each other. Moreover, the pico cell 200 arrange | positioned in the wide area cell 100 may be one, or plural.

上述したように本無線通信システムにおいては、同一の無線通信システムの広域セル１００とピコセル２００が重なり合って配置され、さらにはピコセル２００同士が重なり合って配置される場合がある。このために広域セル１００及びピコセル２００において同時に同じ周波数帯を用いるときには、各セル１００，２００で使用される周波数チャネルは互いに干渉を与え合うことが起こり得る。本実施形態においては、その干渉を回避あるいは軽減するために、各セル１００，２００を形成するための無線基地局が同時に同じ周波数帯を利用可能なように制御する制御手段を設ける。具体的には、広域セル基地局１及び各小型無線基地局２がそれぞれ用いる周波数チャネル又は送信電力を調整する制御手段を設ける。
なお、「周波数帯」とは、ある無線通信システム全体に割り当てられた無線周波数帯域全体を指す。また、「周波数チャネル」とは、その周波数帯をさらに細分化したものを指す。例えば、ある無線通信システム全体に割り当てられた「周波数帯」が5.15GHz〜5.25GHzであったとすると、その周波数帯の中で使用可能な「周波数チャネル」としては例えば各々幅が約20MHzで中心の周波数が5.17GHz、5.19GHz、5.21GHz、5.23GHzの四種類を選択することができる。 As described above, in the present radio communication system, the wide area cell 100 and the pico cell 200 of the same radio communication system may be arranged to overlap each other, and further, the pico cells 200 may be arranged to overlap each other. For this reason, when the same frequency band is used in the wide area cell 100 and the pico cell 200 at the same time, the frequency channels used in the cells 100 and 200 may interfere with each other. In the present embodiment, in order to avoid or reduce the interference, a control unit is provided for controlling so that the radio base stations for forming the cells 100 and 200 can simultaneously use the same frequency band. Specifically, control means for adjusting the frequency channel or transmission power used by the wide-area cell base station 1 and each small radio base station 2 is provided.
The “frequency band” refers to the entire radio frequency band assigned to a certain radio communication system. Further, the “frequency channel” refers to a further subdivided frequency band. For example, if the “frequency band” assigned to an entire wireless communication system is 5.15 GHz to 5.25 GHz, the “frequency channels” that can be used in that frequency band are, for example, about 20 MHz in width and center. Four types of frequencies of 5.17GHz, 5.19GHz, 5.21GHz, 5.23GHz can be selected.

以下、実施例を挙げて本実施形態に係る無線通信制御処理を詳細に説明する。なお、各実施例の説明においては、図１に例示されるように広域セル１００内に２つのピコセル２００が配置されている場合を例に挙げて説明する。   Hereinafter, an example is given and the radio | wireless communication control process which concerns on this embodiment is demonstrated in detail. In the description of each embodiment, a case where two pico cells 200 are arranged in the wide area cell 100 as illustrated in FIG. 1 will be described as an example.

図２は、本発明の実施例１に係る無線通信制御処理手順を示すシーケンスチャートである。本実施例１においては、集中制御局４が集中的に周波数チャネル及び送信電力の調整を行う。   FIG. 2 is a sequence chart showing a wireless communication control processing procedure according to the first embodiment of the present invention. In the first embodiment, the central control station 4 adjusts the frequency channel and transmission power intensively.

図２において、各基地局１，２及び各移動局装置３は通常動作中である（ステップＳ０）。集中制御局４は、定期的に、或いはイベントトリガ発生時（例えば、新規の小型無線基地局２の設置完了時）に、周波数チャネル切り替え・送信電力制御手順を開始し（ステップＳ１）、配下の広域セル基地局１及び各小型無線基地局２に対して、周波数チャネル切り替え・送信電力制御手順の起動を通知する（ステップＳ２）。   In FIG. 2, the base stations 1 and 2 and the mobile station devices 3 are in normal operation (step S0). The centralized control station 4 starts a frequency channel switching / transmission power control procedure periodically or when an event trigger occurs (for example, when the installation of a new small radio base station 2 is completed) (step S1). The wide-area cell base station 1 and each small radio base station 2 are notified of activation of the frequency channel switching / transmission power control procedure (step S2).

次いで、その通知を受信した広域セル基地局１及び各小型無線基地局２は、移動局装置３に向けた干渉状況観測用の制御信号を送信する（ステップＳ３，Ｓ４，Ｓ５）。その制御信号は一定の周期で送信される。各移動局装置３は、受信した制御信号の受信信号強度（ＲＳＳＩ（Received Signal Strength Indicator））を測定して、干渉状況を表す値（例えば、Ｃ／Ｉ値（Carrier to Interference Ratio））を算出する。そして、その算出した干渉状況値を、最寄りの基地局１，２（例えば、受信信号強度が最大である基地局）に通知する（ステップＳ６，Ｓ８）。その通知を受けた基地局１，２は、受け取った干渉状況値を集中制御局４に転送する（ステップＳ７，Ｓ９）。図２の例では、移動局装置３（Ａ）の干渉状況値は、小型無線基地局２（Ａ）を介して集中制御局４に通知される。また、移動局装置３（Ｂ）の干渉状況値は、小型無線基地局２（Ｂ）を介して集中制御局４に通知される。   Next, the wide-area cell base station 1 and each small radio base station 2 that have received the notification transmit a control signal for observing the interference state toward the mobile station device 3 (steps S3, S4, S5). The control signal is transmitted at a constant cycle. Each mobile station device 3 measures the received signal strength (RSSI (Received Signal Strength Indicator)) of the received control signal, and calculates a value (for example, C / I value (Carrier to Interference Ratio)) representing the interference state. To do. Then, the calculated interference state value is notified to the nearest base stations 1 and 2 (for example, the base station having the maximum received signal strength) (steps S6 and S8). Receiving the notification, the base stations 1 and 2 transfer the received interference status value to the central control station 4 (steps S7 and S9). In the example of FIG. 2, the interference status value of the mobile station device 3 (A) is notified to the centralized control station 4 via the small radio base station 2 (A). Further, the interference status value of the mobile station device 3 (B) is notified to the centralized control station 4 via the small radio base station 2 (B).

次いで、集中制御局４は、その受信した干渉状況値に基づき、周波数チャネル間の干渉を回避あるいは軽減するように、広域セル基地局１及び各小型無線基地局２の周波数チャネル及び送信電力を決定する（ステップＳ１０）。次いで、集中制御局４は、広域セル基地局１及び各小型無線基地局２に対して、決定した周波数チャネル及び送信電力を通知する（ステップＳ１１，Ｓ１２，Ｓ１３）。   Next, the centralized control station 4 determines the frequency channel and transmission power of the wide-area cell base station 1 and each small radio base station 2 so as to avoid or reduce interference between frequency channels based on the received interference status value. (Step S10). Next, the centralized control station 4 notifies the determined frequency channel and transmission power to the wide-area cell base station 1 and each small radio base station 2 (steps S11, S12, S13).

次いで、広域セル基地局１及び各小型無線基地局２は、それぞれ集中制御局４から通知された周波数チャネル及び送信電力を設定し、それぞれ移動局装置３に向けて自己の周波数チャネルを報知する（ステップＳ１４，Ｓ１５，Ｓ１６）。その周波数チャネルを報知する制御信号は一定の周期で送信される。次いで、広域セル基地局１及び各小型無線基地局２は、一斉に、周波数チャネル及び送信電力を変更する（ステップＳ１７）。その後、各基地局１，２及び各移動局装置３は通常動作を再開する（ステップＳ１８）。   Next, each of the wide-area cell base station 1 and each small radio base station 2 sets the frequency channel and transmission power notified from the centralized control station 4, and broadcasts its own frequency channel to the mobile station device 3 respectively ( Steps S14, S15, S16). A control signal for broadcasting the frequency channel is transmitted at a constant cycle. Next, the wide-area cell base station 1 and each small radio base station 2 simultaneously change the frequency channel and transmission power (step S17). Thereafter, the base stations 1 and 2 and the mobile station devices 3 resume normal operation (step S18).

なお、集中制御局４は広域セル基地局１及び各小型無線基地局２の周波数チャネルのみ、或いは送信電力のみを決定し、これにより各セル１００，２００における周波数チャネル間の干渉を回避あるいは軽減するようにしてもよい。   The centralized control station 4 determines only the frequency channels of the wide area cell base station 1 and each small radio base station 2 or only the transmission power, thereby avoiding or reducing interference between the frequency channels in the cells 100 and 200. You may do it.

また、上記した干渉状況観測用の制御信号を用いずに、受信した無線信号に基づいて受信信号強度を測定し、干渉状況値を算出してもよい。   Alternatively, the interference situation value may be calculated by measuring the received signal strength based on the received radio signal without using the control signal for observing the interference situation.

上述した実施例１によれば、集中制御局４によって集中的に周波数チャネル及び送信電力の調整を行うので、その調整管理を一括して行うことができる。   According to the first embodiment described above, since the frequency channel and transmission power are intensively adjusted by the centralized control station 4, the adjustment management can be performed collectively.

図３は、本発明の実施例２に係る無線通信制御処理手順を示すシーケンスチャートである。本実施例２においては、各小型無線基地局２が自律分散的に周波数チャネル及び送信電力の調整を行う。なお、図３においては、新たに小型無線基地局２（Ｂ）が設置された場合を例示している。   FIG. 3 is a sequence chart showing a wireless communication control processing procedure according to the second embodiment of the present invention. In the second embodiment, each small radio base station 2 adjusts the frequency channel and transmission power in an autonomous and distributed manner. In addition, in FIG. 3, the case where the small radio base station 2 (B) is newly installed is illustrated.

図３において、広域セル基地局１、小型無線基地局２（Ａ）及び各移動局装置３は通常動作中である（ステップＳ３０）。新設された小型無線基地局２（Ｂ）は、電源がオンされると（ステップＳ３１）、集中制御局４との間で、ネゴシエーションを行い、同期を確立する（ステップＳ３２）。   In FIG. 3, the wide-area cell base station 1, the small radio base station 2 (A), and each mobile station apparatus 3 are in normal operation (step S30). When the newly established small radio base station 2 (B) is powered on (step S31), it negotiates with the central control station 4 to establish synchronization (step S32).

次いで、小型無線基地局２（Ｂ）は、干渉状況の観測を行う（ステップＳ３３）。この干渉状況の観測においては、広域セル基地局１、小型無線基地局２（Ａ）及び各移動局装置３からのそれぞれの受信信号強度を測定する。そして、測定したＲＳＳＩに基づき、広域セル基地局１、小型無線基地局２（Ａ）及び各移動局装置３に係る各干渉状況値（例えばＣ／Ｉ値）を算出する。また、周波数チャネルの空きを調べる。   Next, the small radio base station 2 (B) observes the interference state (step S33). In the observation of the interference situation, the received signal strengths from the wide-area cell base station 1, the small radio base station 2 (A), and each mobile station apparatus 3 are measured. Then, based on the measured RSSI, each interference state value (for example, C / I value) relating to the wide-area cell base station 1, the small radio base station 2 (A), and each mobile station apparatus 3 is calculated. Also, check the frequency channel availability.

次いで、小型無線基地局２（Ｂ）は、その干渉状況の観測結果に基づき、周波数チャネル間の干渉を回避あるいは軽減するように、自局が使用する周波数チャネル及び送信電力を決定する（ステップＳ３４）。次いで、小型無線基地局２（Ｂ）は、その決定した自局の周波数チャネル及び送信電力を制御情報により各基地局１，２及び各移動局装置３に報知する（ステップＳ３５）。その後、小型無線基地局２（Ｂ）は、ステップＳ３４で決定した周波数チャネル及び送信電力で通常動作を開始する（ステップＳ３６）。   Next, the small radio base station 2 (B) determines the frequency channel and transmission power used by the small radio base station 2 (B) so as to avoid or reduce interference between the frequency channels based on the observation result of the interference state (step S34). ). Next, the small radio base station 2 (B) notifies the base station 1, 2 and each mobile station apparatus 3 of the determined frequency channel and transmission power of the own base station using control information (step S35). Thereafter, the small radio base station 2 (B) starts normal operation with the frequency channel and transmission power determined in step S34 (step S36).

次いで、小型無線基地局２（Ｂ）からの周波数チャネル及び送信電力の通知を受けた小型無線基地局２（Ａ）は、該通知によって小型無線基地局２（Ｂ）の開設に伴う周波数チャネル及び送信電力の設定を認識し、これにより干渉状況の観測を行う（ステップＳ４１）。この干渉状況の観測においては、上記ステップＳ３３と同様の観測処理を行う。また、周波数チャネルの空きを調べる。また、現在接続中の移動局装置３があれば、その移動局装置３で観測された干渉状況値を受け取る（ステップＳ４２）。図３の例では、移動局装置３（Ａ）で観測された干渉状況値を受け取る。   Next, the small radio base station 2 (A) that has received the notification of the frequency channel and transmission power from the small radio base station 2 (B), and the frequency channel associated with the establishment of the small radio base station 2 (B) by the notification, The setting of the transmission power is recognized, and thereby the interference state is observed (step S41). In the observation of the interference state, the same observation process as in step S33 is performed. Also, check the frequency channel availability. If there is a mobile station apparatus 3 that is currently connected, the interference state value observed by the mobile station apparatus 3 is received (step S42). In the example of FIG. 3, the interference state value observed by the mobile station device 3 (A) is received.

次いで、小型無線基地局２（Ａ）は、その干渉状況の観測結果に基づき、周波数チャネル間の干渉を回避あるいは軽減するように、自局が使用する周波数チャネル及び送信電力を決定する（ステップＳ４３）。次いで、小型無線基地局２（Ａ）は、その決定した自局の周波数チャネル及び送信電力を制御情報により各基地局１，２及び各移動局装置３に報知する（ステップＳ４４）。その後、小型無線基地局２（Ａ）は、ステップＳ４３で決定した周波数チャネル及び送信電力で通常動作を再開する（ステップＳ４５）。   Next, the small radio base station 2 (A) determines the frequency channel and transmission power used by the local radio base station 2 (A) so as to avoid or reduce interference between the frequency channels based on the observation result of the interference state (step S43). ). Next, the small radio base station 2 (A) notifies the base station 1, 2 and each mobile station apparatus 3 of the determined frequency channel and transmission power of the own station by using the control information (step S44). Thereafter, the small radio base station 2 (A) resumes normal operation with the frequency channel and transmission power determined in step S43 (step S45).

なお、小型無線基地局２は、上記した小型無線基地局２の開設時以外に、例えば定期的に、周波数チャネル及び送信電力の調整を自律的に行ってもよい。   Note that the small radio base station 2 may autonomously adjust the frequency channel and transmission power periodically, for example, other than when the small radio base station 2 is opened.

上述した実施例２によれば、各小型無線基地局２によって自律分散的に周波数チャネル及び送信電力の調整を行うので、集中制御局４にはその調整にかかる処理が不要であり、集中制御局４の装置コストを最も低く抑えることができる。   According to the second embodiment described above, since the frequency channels and transmission power are adjusted autonomously and distributed by each small radio base station 2, the centralized control station 4 does not need processing for the adjustment, and the centralized control station 4 can be minimized.

図４は、本発明の実施例３に係る無線通信制御処理手順を示すシーケンスチャートである。本実施例３においては、上記した実施例１と実施例２の組合せの一例であって、集中制御局４が干渉状況を収集して各基地局１，２に転送し、各基地局１，２がその干渉状況から自律分散的に周波数チャネル及び送信電力の調整を行う。なお、図４において、図２及び図３の各ステップに対応する部分には同一の符号を付している。   FIG. 4 is a sequence chart showing a wireless communication control processing procedure according to the third embodiment of the present invention. The third embodiment is an example of a combination of the first embodiment and the second embodiment described above, in which the central control station 4 collects interference conditions and transfers them to the base stations 1 and 2. 2 adjusts the frequency channel and transmission power in an autonomous and distributed manner from the interference state. In FIG. 4, parts corresponding to the steps in FIGS. 2 and 3 are denoted by the same reference numerals.

図４において、各基地局１，２及び各移動局装置３は通常動作中である（ステップＳ０）。集中制御局４は、上記図２と同様に、周波数チャネル切り替え・送信電力制御手順を開始して各基地局１，２から干渉状況値を収集する（ステップＳ１〜Ｓ９）。次いで、集中制御局４は、その収集した干渉状況値を各基地局１，２に転送する（ステップＳ５１，Ｓ５２，Ｓ５３）。   In FIG. 4, the base stations 1 and 2 and the mobile station devices 3 are in normal operation (step S0). The central control station 4 starts a frequency channel switching / transmission power control procedure and collects interference status values from the base stations 1 and 2 (steps S1 to S9), as in FIG. Next, the centralized control station 4 transfers the collected interference status values to the base stations 1 and 2 (steps S51, S52, and S53).

次いで、各基地局１，２は、それぞれ集中制御局４から受け取った干渉状況値に基づき、周波数チャネル間の干渉を回避あるいは軽減するように、自局が使用する周波数チャネル及び送信電力を決定する（ステップＳ４３）。次いで、各基地局１，２は、それぞれ決定した周波数チャネル及び送信電力を設定し、それぞれ移動局装置３に向けて自己の周波数チャネルを報知する（ステップＳ１４，Ｓ１５，Ｓ１６）。次いで、各基地局１，２は、一斉に、周波数チャネル及び送信電力を変更する（ステップＳ１７）。その後、各基地局１，２及び各移動局装置３は通常動作を再開する（ステップＳ１８）。   Next, each of the base stations 1 and 2 determines a frequency channel and transmission power used by the base station so as to avoid or reduce interference between frequency channels based on the interference status value received from the centralized control station 4. (Step S43). Next, each of the base stations 1 and 2 sets the determined frequency channel and transmission power, and broadcasts its own frequency channel to the mobile station device 3 (steps S14, S15, and S16). Next, the base stations 1 and 2 simultaneously change the frequency channel and transmission power (step S17). Thereafter, the base stations 1 and 2 and the mobile station devices 3 resume normal operation (step S18).

なお、各移動局装置３に対して予め周波数チャネルを変更する旨を通知しておくことにより、ステップＳ１７の周波数チャネルの切り替えを円滑に行うことができる。   In addition, by notifying each mobile station apparatus 3 that the frequency channel is to be changed in advance, the frequency channel switching in step S17 can be performed smoothly.

上述した実施例３によれば、集中制御局４によって干渉状況を収集して、各基地局１，２における自律分散的な周波数チャネル及び送信電力の調整に利用するので、詳細な干渉状況に基づいて調整を行うことができる。また、集中制御局４は干渉状況の収集及び転送を行うのみであり、集中制御局４の装置コストを低く抑えることができる。   According to the third embodiment described above, the interference state is collected by the centralized control station 4 and used for adjusting the autonomous distributed frequency channel and transmission power in each of the base stations 1 and 2, so that it is based on the detailed interference state. Adjustments can be made. Further, the central control station 4 only collects and transfers interference conditions, and the apparatus cost of the central control station 4 can be kept low.

図５は、本発明の実施例４に係る無線通信制御処理手順を示すシーケンスチャートである。本実施例４においては、上記した実施例３と同様に実施例１と実施例２の組合せの一例であって、集中制御局４が干渉状況を収集して各基地局１，２の周波数チャネルを決定し、各基地局１，２がその周波数チャネルにおける干渉状況を観測して自律分散的に送信電力の調整を行う。なお、図５において、図２及び図３の各ステップに対応する部分には同一の符号を付している。   FIG. 5 is a sequence chart showing a wireless communication control processing procedure according to the fourth embodiment of the present invention. The fourth embodiment is an example of a combination of the first embodiment and the second embodiment, similar to the third embodiment described above, in which the central control station 4 collects interference conditions and the frequency channels of the base stations 1 and 2 are collected. Each base station 1, 2 observes the interference situation in the frequency channel and adjusts transmission power in an autonomous and distributed manner. In FIG. 5, the same reference numerals are given to portions corresponding to the steps in FIGS. 2 and 3.

図５において、各基地局１，２及び各移動局装置３は通常動作中である（ステップＳ０）。集中制御局４は、上記図２と同様に、周波数チャネル切り替え・送信電力制御手順を開始して各基地局１，２から干渉状況値を収集する（ステップＳ１〜Ｓ９）。次いで、集中制御局４は、その収集した干渉状況値に基づき、周波数チャネル間の干渉を回避あるいは軽減するように、各基地局１，２の周波数チャネルを決定する（ステップＳ１０ａ）。   In FIG. 5, the base stations 1 and 2 and the mobile station devices 3 are operating normally (step S0). The central control station 4 starts a frequency channel switching / transmission power control procedure and collects interference status values from the base stations 1 and 2 (steps S1 to S9), as in FIG. Next, the centralized control station 4 determines the frequency channels of the base stations 1 and 2 so as to avoid or reduce interference between the frequency channels based on the collected interference status values (step S10a).

次いで、集中制御局４は、各基地局１，２に決定した周波数チャネルを通知する（ステップＳ１１ａ，Ｓ１２ａ，Ｓ１３ａ）。次いで、各基地局１，２は、それぞれ集中制御局４から通知された周波数チャネルを設定し、それぞれ移動局装置３に向けて自己の周波数チャネルを報知する（ステップＳ１４，Ｓ１５，Ｓ１６）。次いで、各基地局１，２は、一斉に周波数チャネルを変更する（ステップＳ１７ａ）。   Next, the centralized control station 4 notifies the determined frequency channels to the base stations 1 and 2 (steps S11a, S12a, and S13a). Next, each of the base stations 1 and 2 sets the frequency channel notified from the centralized control station 4 and broadcasts its own frequency channel to the mobile station device 3 (steps S14, S15, and S16). Next, the base stations 1 and 2 change the frequency channel at the same time (step S17a).

次いで、各基地局１，２は、それぞれに、上記図３と同様の干渉状況の観測を行う（ステップＳ４１）。次いで、各基地局１，２は、それぞれの干渉状況の観測結果に基づき、周波数チャネル間の干渉を回避あるいは軽減するように、自局が使用する送信電力を決定し、その決定に従って送信電力を制御する（ステップＳ４３ａ）。その後、各基地局１，２及び各移動局装置３は通常動作を再開する（ステップＳ１８）。   Next, each of the base stations 1 and 2 observes the interference state similar to that in FIG. 3 (step S41). Next, each base station 1 and 2 determines the transmission power used by the base station so as to avoid or reduce interference between frequency channels based on the observation results of the respective interference conditions, and the transmission power is determined according to the determination. Control (step S43a). Thereafter, the base stations 1 and 2 and the mobile station devices 3 resume normal operation (step S18).

なお、各基地局１，２は、定期的に、送信電力の調整を自律的に行ってもよい。   In addition, each base station 1 and 2 may adjust transmission power autonomously regularly.

上述した実施例４によれば、集中制御局４によって集中的に周波数チャネルのみの調整を行い、送信電力については各基地局１，２で自律分散的に調整するので、周波数チャネルの調整管理を一括して行うことができるとともに、送信電力の調整を各基地局１，２のリアルタイムな干渉状況に基づいて行うことができる。また、集中制御局４は送信電力の調整を行わないので、その負荷が軽減される。   According to the above-described fourth embodiment, only the frequency channel is intensively adjusted by the centralized control station 4, and the transmission power is adjusted autonomously in the base stations 1 and 2, so that the frequency channel adjustment management is performed. While being able to perform collectively, transmission power adjustment can be performed based on the real-time interference situation of each base station 1 and 2. Further, since the central control station 4 does not adjust transmission power, the load is reduced.

上述したように本実施形態によれば、広域セル基地局１及び各小型無線基地局２がそれぞれ用いる周波数チャネル又は送信電力を調整する制御手段を設けたので、同一の無線通信システムの広域セル１００とピコセル２００が重なり合って配置されていても、さらにはピコセル２００同士が重なり合って配置されたとしても、周波数チャネル間の干渉を回避あるいは軽減することができ、通信品質を良好に保つことが可能になる。   As described above, according to the present embodiment, since the control means for adjusting the frequency channel or transmission power used by the wide area cell base station 1 and each small radio base station 2 is provided, the wide area cell 100 of the same radio communication system is provided. Even if the pico cells 200 are arranged so as to overlap each other, and even if the pico cells 200 are arranged so as to overlap each other, it is possible to avoid or reduce interference between frequency channels and to maintain good communication quality. Become.

これにより、広域セル方式とピコセル方式を単一の無線通信システムで実現することができる。この結果として、以下に示す効果が得られる。
（１）ビル影や屋内など、局所的に電波の届かない地域においても、ピコセルの配置によって十分な受信信号強度が得られ、無線接続サービスエリアの拡張に寄与することができる。
（２）ユーザ数が膨大となった場合においても、一広域セル基地局では収容しきれないユーザをピコセル基地局によって収容することができるので、所望のネットワーク性能を維持しつつユーザ数の増大に対応することができる。
（３）周波数チャネル或いは送信電力を自動的に制御することができるので、ピコセル基地局の設置に際しての事前のセル設計やチャネル設計が不要となり、人的工数の削減に繋がる。
（４）広域セル方式とピコセル方式を同一の無線通信システムで実現することができるので、無線端末は唯一つの無線通信システムに対応すればよく、端末コストや消費電力の増大を防ぐことができる。 Thereby, a wide area cell system and a pico cell system are realizable with a single radio | wireless communications system. As a result, the following effects are obtained.
(1) Even in areas where radio waves do not reach locally, such as in the shadow of a building or indoors, sufficient received signal strength can be obtained by the placement of picocells, contributing to the expansion of the wireless connection service area.
(2) Even when the number of users becomes enormous, users that cannot be accommodated by one wide-area cell base station can be accommodated by the picocell base station, so that the number of users can be increased while maintaining desired network performance. Can respond.
(3) Since the frequency channel or transmission power can be automatically controlled, the cell design and channel design prior to the installation of the picocell base station are not required, leading to a reduction in man-hours.
(4) Since the wide area cell method and the pico cell method can be realized by the same wireless communication system, the wireless terminal only needs to support one wireless communication system, and increase in terminal cost and power consumption can be prevented.

以上、本発明の実施形態を図面を参照して詳述してきたが、具体的な構成はこの実施形態に限られるものではなく、本発明の要旨を逸脱しない範囲の設計変更等も含まれる。
例えば、無線通信方式としては、例えば、時分割多元接続方式（ＴＤＭＡ）、周波数分割多元接続方式（ＦＤＭＡ）、符号分割多元接続方式（ＣＤＭＡ）、空間分割多元接続方式（ＳＤＭＡ）のいずれの多元接続方式を適用してもよい。また、セルのセクタ化やアレイアンテナの導入などによる空間分割を用いることにより、さらに効率的な運用も可能である。 The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like within a scope not departing from the gist of the present invention.
For example, as a wireless communication system, for example, any one of time division multiple access (TDMA), frequency division multiple access (FDMA), code division multiple access (CDMA), and space division multiple access (SDMA) A scheme may be applied. Further, more efficient operation is possible by using space division by cell sectorization or introduction of an array antenna.

本発明の一実施形態に係る無線通信システムの全体構成を示す図である。1 is a diagram illustrating an overall configuration of a wireless communication system according to an embodiment of the present invention. 本発明の実施例１に係る無線通信制御処理手順を示すシーケンスチャートである。It is a sequence chart which shows the radio | wireless communication control processing procedure which concerns on Example 1 of this invention. 本発明の実施例２に係る無線通信制御処理手順を示すシーケンスチャートである。It is a sequence chart which shows the radio | wireless communication control processing procedure which concerns on Example 2 of this invention. 本発明の実施例３に係る無線通信制御処理手順を示すシーケンスチャートである。It is a sequence chart which shows the radio | wireless communication control processing procedure which concerns on Example 3 of this invention. 本発明の実施例４に係る無線通信制御処理手順を示すシーケンスチャートである。It is a sequence chart which shows the radio | wireless communication control processing procedure which concerns on Example 4 of this invention.

符号の説明Explanation of symbols

１…広域セル基地局、２…小型無線基地局（ピコセル基地局）、３…移動局装置、４…集中制御局、５…公衆網、１００…広域セル、２００…ピコセル

DESCRIPTION OF SYMBOLS 1 ... Wide area cell base station, 2 ... Small radio base station (picocell base station), 3 ... Mobile station apparatus, 4 ... Central control station, 5 ... Public network, 100 ... Wide area cell, 200 ... Picocell

Claims (7)

特定の無線通信方式の無線接続サービスエリアを提供する広域セルと、前記広域セルと同じ無線通信方式の無線接続サービスエリアであって前記広域セルよりも小さい無線接続サービスエリアを提供するピコセルとを重なり合うように配置し、
前記各セルを形成するための無線基地局が同時に同じ周波数帯を利用可能なように制御する制御手段を備えたことを特徴とする無線通信システム。 A wide area cell that provides a wireless connection service area of a specific wireless communication method overlaps a pico cell that is a wireless connection service area of the same wireless communication method as the wide area cell and provides a wireless connection service area smaller than the wide area cell. And place
A radio communication system comprising a control means for controlling so that radio base stations for forming each cell can use the same frequency band at the same time. 前記制御手段は、前記各セルにおける干渉状況に基づき、前記各無線基地局が使用する周波数チャネル又は前記各無線基地局の送信電力を調整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 radio communication system according to claim 1, wherein the control unit adjusts a frequency channel used by each radio base station or a transmission power of each radio base station based on an interference state in each cell. . 前記周波数チャネル又は前記送信電力を集中的に制御する集中制御局を備えたことを特徴とする請求項２に記載の無線通信システム。   The wireless communication system according to claim 2, further comprising a central control station that centrally controls the frequency channel or the transmission power. 前記各無線基地局において自律分散的に周波数チャネル又は送信電力を制御する手段を備えたことを特徴とする請求項２に記載の無線通信システム。   The radio communication system according to claim 2, further comprising means for controlling frequency channels or transmission power in an autonomous and distributed manner in each radio base station. 前記干渉状況を集中的に把握する集中制御局と、
前記各無線基地局において自律分散的に周波数チャネル又は送信電力を制御する手段と、
を備えたことを特徴とする請求項２に記載の無線通信システム。 A centralized control station for intensively grasping the interference situation;
Means for controlling frequency channels or transmission power in an autonomous and distributed manner in each of the radio base stations;
The wireless communication system according to claim 2, further comprising: 前記干渉状況を集中的に把握するとともに、前記周波数チャネルを集中的に制御する集中制御局と、
前記各無線基地局において自律分散的に送信電力を制御する手段と、
を備えたことを特徴とする請求項２に記載の無線通信システム。 A centralized control station that centrally grasps the interference state and centrally controls the frequency channel;
Means for controlling transmission power in an autonomous and distributed manner in each of the radio base stations;
The wireless communication system according to claim 2, further comprising: 特定の無線通信方式の無線接続サービスエリアを提供する広域セルと、前記広域セルと同じ無線通信方式の無線接続サービスエリアであって前記広域セルよりも小さい無線接続サービスエリアを提供するピコセルとを重なり合うように配置した無線通信システムにおける無線通信制御方法であって、
前記各セルを形成するための無線基地局が同時に同じ周波数帯を利用可能なように制御する制御過程を有することを特徴とする無線通信制御方法。


A wide area cell that provides a wireless connection service area of a specific wireless communication method overlaps a pico cell that is a wireless connection service area of the same wireless communication method as the wide area cell and provides a wireless connection service area smaller than the wide area cell. A wireless communication control method in a wireless communication system arranged as described above,
A radio communication control method comprising: a control process of controlling so that radio base stations for forming the cells can use the same frequency band at the same time.


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