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JPH0555988A - Cellular mobile communication system - Google Patents

Cellular mobile communication system

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Publication number
JPH0555988A
JPH0555988A JP21216991A JP21216991A JPH0555988A JP H0555988 A JPH0555988 A JP H0555988A JP 21216991 A JP21216991 A JP 21216991A JP 21216991 A JP21216991 A JP 21216991A JP H0555988 A JPH0555988 A JP H0555988A
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station
base
communication
control
signal
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JP2946492B2 (en )
Inventor
Masaharu Hata
Masayuki Sakamoto
正行 坂本
正治 秦
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Nippon Telegr & Teleph Corp <Ntt>
日本電信電話株式会社
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Abstract

PURPOSE:To prevent a failure in channel changeover even when a moving speed of a mobile station is fast by interconnecting a control base station using a cell including plural small cells as its own area and each base station of a small cell with a loop transmission line, allowing the control base station to monitor reception quality information of a mobile station in the communication state sent from each base station of a small cell to the loop transmission line and control the information. CONSTITUTION:Each of base stations 17-20 sends a signal comprising reception quality information of a mobile station in communication, an identification code of its own station and a number of a communication channel used for the communication with a mobile station to a loop transmission line 25, the other base station receives the signal and relays the signal to a control base station 15. The control base station 15 monitors the relayed signal and when the station 15 detects deterioration in the quality and rapid level fluctuation in the signal unable to be received by a base station of a small cell, the station 15 selects an idle communication channel allocated to its own station and continues the communication.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】本発明は、周波数利用率の高い大容量のセルラ移動通信方式に関する。 The present invention relates to a cellular mobile communication system having a high frequency utilization mass.

【0002】 [0002]

【従来の技術】移動通信においては周波数の有効利用が最大の課題であり、このため所謂セルラ方式と呼ばれる移動通信方式が一般的である。 BACKGROUND OF THE INVENTION Mobile Communication is effective utilization biggest challenge frequencies, Therefore mobile communication system called a so-called cellular system is generally used. これはサービスエリアを複数の基地局でカバーし、一定距離だけ離れた基地局どうしで同一周波数を繰り返して使用することにより周波数利用効率を向上させるものである。 It covers a service area with a plurality of base stations, to thereby improve the frequency utilization efficiency by using repeatedly the same frequency at a fixed distance away base stations each other. 1つの基地局のカバーするエリアはセルと呼ばれており、セル半径を小さくするほど、より近い距離で周波数が繰り返せるため周波数利用効率が向上する。 Area covered by one base station is called a cell, the smaller the cell radius, the frequency utilization efficiency is improved because the can repeat frequency in closer distance.

【0003】しかし、この反面、移動局が通信中の基地局から出て、隣接基地局のエリアに移行する機会が多くなる。 [0003] However, the other hand, the mobile station is out of the base station in communication, composed of many opportunities to migrate to the adjacent base station area. このとき、通信中の基地局での受信レベルが低下するから通信を継続させるためには、移動局が通信する相手基地局を移行先の基地局に切り替える必要がある。 At this time, since the reception level at the base station during communication to continue the communication because decreases, it is necessary to switch the another base station which the mobile station communicates to the destination base station.
基地局までの有線伝送路の切替えとともに、移動局の周波数を移行先基地局の空きチャネルに切り替える必要があることから、これを通信中チャネル切替えと言い、セルラ方式では必須の制御である。 With switching of the wired transmission path to the base station, it is necessary to switch to a free channel of the destination base station the frequency of the mobile station, referred to as the channel switching during communication it is an essential control in cellular systems.

【0004】図4は従来のセルラ移動通信方式構成の例を示す図であって、1は中央制御局、2〜5は基地局、 [0004] Figure 4 is a diagram showing an example of a conventional cellular mobile communication system configuration, 1 the central control station, 2 to 5 the base station,
6〜9は基地局と中央制御局間の伝送路、10〜13はセルである。 6-9 transmission path between the base station and the central control station, 10-13 is the cell. 各基地局はさらに有線通信路により中央制御局1を経て固定電話網(図示せず)に接続される。 Each base station is further connected to the fixed telephone network via a central control station 1 (not shown) by wire communication path.

【0005】今、移動局がセル11にあり基地局3と通信しているものとする。 [0005] Now, it is assumed that the mobile station is communicating with the base station 3 is in the cell 11. 移動局が移動してセル12に入った時の通信中チャネル切替えの制御動作は次のようになる。 Control operation of the switching during communication channel when a mobile station enters the cell 12 moves is as follows.

【0006】移動局の移動に伴い受信レベルが規定値以下に低下したことを検出した基地局3は、伝送路7を介して中央制御局1にチャネル切替えを依頼する。 [0006] The base station 3 detects that the reception level due to movement of the mobile station falls below a specified value, requests the switching channel to the central control station 1 via the transmission channel 7. これを受け、中央制御局1は基地局3の周辺の基地局2,4, In response to this, the central control station 1 is a base station 2 and 4 near the base station 3,
5に対して移動局からの電波を監視するように伝送路6,8,9を介して指示する。 The radio waves from the mobile station to indicate via the transmission path 6, 8 and 9 to monitor against 5. 基地局2,4,5は当該移動局の使用チャネルを受信して受信レベルを測定し、 The base station 2,4,5 measures the reception level to receive the used channel of the mobile station,
測定結果を伝送路6,8,9を介して中央制御局1に報告する。 The measurement results via the transmission path 6, 8 and 9 report to the central control station 1. これに基づき中央制御局1は報告値を比較して最も高いレベルで受信した基地局を特定する。 Central control station 1 on the basis of which identifies the base station received by comparing reported values ​​at the highest level. この場合は基地局4が最大レベル受信局となる。 In this case the base station 4 has a maximum level receiving station. そこで中央制御局1は基地局4に対して空き通信チャネル番号(#Nとする)を通知するように伝送路9を介して指示し、これを受けて基地局4は空き通信チャネル番号#Nを伝送路9を介して中央制御局1に報告する。 Therefore the central control station 1 instructs through the transmission path 9 so as to notify an available communication channel number (and #N) to the base station 4, free memory channel number base station 4 receives this #N the via transmission line 9 to report to the central control station 1.

【0007】次に、中央制御局1は、基地局3に対して基地局3から移動局に通信チャネル#Nへの切り替え指示信号を送出するよう伝送路7を介して指示すると同時に、基地局4に対して通信チャネル#Nの送受信機をオンとするよう伝送路9を介して指示し、対基地局の有線通信路を基地局3から基地局4の通信チャネル#Nに対応する回線に切り替える。 [0007] Next, the central control station 1, and simultaneously instructs through the transmission path 7 so as to deliver a switching instruction signal to the communication channel #N to the mobile station from the base station 3 to the base station 3, the base station 4 through the transmission path 9 so as to turn on the transceiver communication channel #N instructs the, in the line corresponding wired communications path pairs base station from the base station 3 in the communication channel #N of the base station 4 switches. 基地局3は移動局に対して通信チャネル#Nへの切り替え指示信号を送出し、これを受けた移動局は指示された通信チャネルに切り替えることにより基地局4との間の通信チャネルを確立することができる。 The base station 3 sends out a switching instruction signal to the communication channel #N to the mobile station, the mobile station receiving this establishes a communication channel between a base station 4 by switching to the designated communication channel be able to.

【0008】この通信中チャネル切替えの制御は、初めに述べたようにセル半径が小さいほど回数が増え、また、移動局の移動速度が速いほどその回数が増加する。 [0008] Control of the communication in the channel switching, more often as the cell radius is small as mentioned in the beginning, also, as the moving speed of the mobile station is faster that the number is increased.

【0009】 [0009]

【発明が解決しようとする課題】以上説明したように、 As explained in the invention Problems to be Solved] or more,
従来の方式構成では、通信を行っている基地局で受信レベルの低下を検出してから実際に通信中チャネル切替えが完了するまでには、中央制御局と当該基地局およびその周辺の基地局の間で数回の信号授受とこれに伴う制御が必要であり、多くの時間がかかると言う欠点があった。 In the conventional system configuration, from the detection of the decrease of the reception level at the base stations communicating to the actual communication in the channel switching is completed, the central control station and the base station and a base station near the the number of times a signal exchange between the required control associated therewith between, there is a disadvantage that a lot of time-consuming.

【0010】そのため、セル半径が小さい場合あるいは移動局の移動速度が速い場合には、通信中チャネル切替えが完了しない内に隣のセルに移行してしまうことが起こり、通信中チャネル切替えが失敗に終わることがある。 [0010] Therefore, when the moving speed of the cell radius is small or mobile station is fast, happen that the channel switching during communication will migrate to adjacent cells in less complete, the channel switching during communication failure sometimes ending. 従って、これを避けるためにはセル半径を一定以下に小さくできないと言う制約があり、これが周波数利用率向上の限界、従って、システム容量限界の一因となっていた。 Therefore, there are restrictions to say can not be reduced cell radius constant below in order to avoid this, it is a limit to improve frequency utilization, therefore, it has been a cause of the system capacity limit.

【0011】さらに、移動速度の速い自動車電話と移動速度の遅い携帯電話を従来の方式構成で扱う場合、携帯電話の加入者密度の高い市街地では、本来、セル半径を小さくして周波数の繰返し利用を図るべきであるにもかかわらず、上記の点からセル半径を移動速度の速い自動車電話に合わせざるを得ない言う欠点があった。 Furthermore, when dealing with moving slow mobile phone fast moving speed car phone in a conventional manner construction, the high subscriber density phone city originally reuse of frequencies by reducing the cell radius Nevertheless it should achieve, there is drawback that forced fit the cell radius to the moving speed fast car phone in terms of the. このため、携帯電話の加入者密度の高い基地局はより多くの通信チャネルを備える必要があり、従って、周波数割り当てがいびつになり、周波数利用率はさらに低下する。 Therefore, a high base station of subscriber density of mobile phones must be prepared more communication channels, therefore, the frequency allocation is distorted, the frequency utilization will be further reduced.

【0012】一方、携帯電話を対象としてより小さいセルを用いて従来の方式構成をとる場合、例えば、走行する自動車内で携帯電話を使用すると通信中チャネル切替えが急増するため、システムとして対応することが困難である。 Meanwhile, when taking a conventional manner configured with a smaller cell cellular phone as the target, for example, to use the mobile phone in a vehicle that runs for channel switching during communication increases rapidly, that the corresponding the system it is difficult. また、セルが小さいだけにうまくセルが連続して接していなかったり、少しサービスエリアから外れると急激に受信品質が低下するため、このような場所の携帯機は品質の良いサービスを受けることができない。 Further, only or not contact well cell continuously cells are small, in order to decrease rapidly reception quality deviates from the little coverage, the mobile device of such a place can not receive good quality service .

【0013】本発明は、上記に鑑みてなされたもので、 [0013] The present invention has been made in view of the above,
その目的とするところは、移動速度に関わらず高品質で周波数利用率の高い大容量のセルラ移動通信方式を提供することにある。 And an object thereof is to provide a cellular mobile communication system of the high mass frequency utilization with high quality regardless of the moving speed.

【0014】 [0014]

【課題を解決するための手段】上記目的を達成するため、本発明のセルラ移動通信方式は、各々複数の小セルを包含するセルを自己のエリアとする複数の制御基地局と、複数の制御基地局を集中的に制御する集中制御局と、各セル内における複数の小セルにそれぞれ設けられた複数の基地局と、各セルにおける複数の基地局および制御基地局をループ状に接続するループ状伝送路とを設け、各基地局は通信中の移動局の受信品質情報、自局の識別符号および移動局との通信に使用している通信チャネルの番号からなる信号をループ状伝送路に送出し、各基地局はループ状伝送路に接続されている上位基地局からの該信号を受信するとともに下位基地局に中継し、制御基地局は各基地局がループ状伝送路に送出する通信中の移動局の受信品質情 To achieve the above object, according to an aspect of cellular mobile communication system of the present invention, each a plurality of control base station to a cell includes a plurality of small cells of self-areas, a plurality of control loop connecting the central control station for controlling the base station intensively, and a plurality of base stations provided for each of the plurality of small cells within each cell, a plurality of base stations and controls the base station in a loop in each cell and Jo transmission path provided, each base station reception quality information the mobile station in communications, an identification code and a signal consisting of in which the number of communication channels used for communication with the mobile station of its own station in a loop transmission line delivery, each base station is relayed to the lower base station which receives the signals from the upper base stations connected in a loop transmission line, the control base station is the base station sends out a loop-like path communication reception quality information of a mobile station in を監視して、受信品質が所定の第1の条件を満たした場合に、通信を行っている当該基地局の通信チャネルから自己のセルに割り当てられている通信チャネル内の空き通信チャネルに切り替えて通信を継続させ、移動局がセルをまたがって移動する場合には、集中制御局が制御基地局間でチャネルを切り替えて通信を継続させ、制御基地局は制御基地局の通信チャネルで通信中の移動局の電波をセル内の各基地局に受信させて各基地局がループ状伝送路に送出する受信品質情報を監視し、受信品質が所定の第2の条件を満たした場合に、最も良好な受信品質の基地局の空き通信チャネルに通信チャネルを切り替えて通信を継続させ、移動局が小セルをまたがって移動する場合には、基地局間でチャネルを切り替えて通信を継続させることを The monitor, when the reception quality satisfies a predetermined first condition, by switching from the communication channel of the base stations communicating to the free communication channel in a communication channel assigned to its own cell allowed to continue communication, when the mobile station moves across cell switches the channel between centralized control station controls the base station to continue communication, the control base station in communication with the communication channel of the control base station the radio wave of the mobile station by receiving the respective base stations in the cell the base station monitors the reception quality information to be transmitted to the loop transmission line, when the reception quality satisfies a predetermined second condition, the best to continue the communication by switching a communication channel in a vacant communication channel of the base station of the Do reception quality, when the mobile station moves across the small cell, that to continue the communication by switching a channel between base station 旨とする。 And effect.

【0015】 [0015]

【作用】本発明のセルラ移動通信方式では、複数の小セルを包含するセルを自己のエリアとする制御基地局と各小セルの基地局をループ状に接続するループ状伝送路を設け、各基地局は通信中の移動局の受信品質情報、自局の識別符号および移動局との通信に使用されている通信チャネルの番号からなる信号をループ状伝送路に送出し、各基地局は上位基地局からの該信号を受信するとともに下位基地局に中継することにより、制御基地局と各基地局とが個別にやりとりする従来の方法に比べて信号授受の回数を減らし、更に複数の制御基地局とこれらを集中的に制御する集中制御局を設けて広いサービスエリアをカバーし、制御基地局は小セルの各基地局がループ状伝送路に送出する通信中の移動局の受信品質情報を監視し、受信品質が小 [Action] In the cellular mobile communication system of the present invention is provided with a loop-shaped transmission line connecting the cell includes a plurality of small cells a base station and control base station each small cell and its area in a loop, each the base station sends the reception quality information the mobile station in communications, a signal consisting of the identification code and number of the communication channel being used for communication with the mobile station of its own station in a loop transmission line, each base station upper which receives the signals from the base station by relaying the lower base station, reduce the number of signals exchanged by the control base station and each base station is compared with the conventional methods to interact individually, further a plurality of control base station and these cover a wide service area by providing a centralized control station which centrally controlled, the control base station the reception quality information the mobile station in communications in which each base station of the small cell is sent to the loop transmission line monitoring, reception quality is small ルの基地局で通信を行うことができない低い受信レベルや急激なレベル変動(移動通信では受信レベルの変動速度は移動速度に比例するため、レベル変動が速いほど、移動局の移動速度が速いことに対応する)等のように所定の第1の条件を満たした場合に、通信を行っている当該基地局の通信チャネルから自己のセルに割り当てられている通信チャネル内の空き通信チャネルに切り替えて通信を継続させることにより、 For low received levels or sudden level variation can not communicate with the base station Le (in mobile communications change rate of the reception level is proportional to the moving speed, the higher the level fluctuation is fast, it moving speed of the mobile station is faster if it meets a predetermined first condition as such the corresponding), the switching from the communication channel of the base stations communicating to the free communication channel in a communication channel assigned to its own cell by continuing the communication,
走行する自動車内で携帯電話を使用する場合や、小セルが連続してうまく接していなかったり、小セルのサービスエリアから少し外れた場合に、小セルの基地局からエリアの広いセルの基地局に通信チャネルを切り替えて通信を可能とし、また制御基地局は制御基地局の通信チャネルで通信中の移動局の電波をセル内の各基地局に受信させて各基地局がループ状伝送路に送出する受信品質情報を監視し、受信品質が小セルの基地局で通信を行うことができる十分な受信レベル等のように所定の第2の条件を満たした場合に、最も良好な受信品質の基地局の空き通信チャネルに通信チャネルを切り替えて通信を継続させることにより、できるだけセル半径の大きな基地局から小さい基地局に通信チャネルを切り替えるようにしている。 If you are using a mobile phone in traveling in a motor vehicle or, or not in contact with well continuously small cell, if a little out of the service area of ​​the small cell, the base station of a large cell of the area from the base station of the small cell to switch the communication channel to enable communication and control base station in a loop transmission line by each base station by receiving the respective base stations in the radio wave of the mobile station in communication with the communication channel of the control base station cell the reception quality information to be sent to the monitoring, when the reception quality satisfies a predetermined second condition as such sufficient reception level that can communicate with the base stations of the small cells, the best reception quality by continuing the communication by switching a communication channel in a vacant communication channel of the base station, and to switch a communication channel from possible cell radius larger base station of a small base station.

【0016】 [0016]

【実施例】以下、図面を用いて本発明の実施例を説明する。 EXAMPLES Hereinafter, the embodiments of the present invention will be described with reference to the drawings.

【0017】図1は、本発明の一実施例に係わるセルラ移動通信方式の説明図である。 [0017] Figure 1 is an illustration of a cellular mobile communication system according to an embodiment of the present invention. 同図において、14は集中制御局、15は制御基地局、16は制御基地局のセル、17〜20は基地局、21〜24は各基地局の小セル、25はセル内の各基地局を経て制御基地局に帰ってくるループ伝送路、26は集中制御局と制御基地局間の伝送路、27は集中制御局と他の制御基地局間の伝送路、28は集中制御局と図に現われていない制御基地局間の伝送路である。 In the figure, 14 is the central control station 15 control the base station, the cell of the control base station 16, 17 to 20 base stations, 21 to 24 small cells of each base station, 25 each base station in the cell loop transmission path coming back to the control base station via a transmission path between 26 and central control station controlling the base station, transmission path between the central control station and other control base station 27, figures and the central control station 28 a transmission path between appeared not control the base station to the. 各基地局にはその小セルエリア内のトラヒックに応じて1つまたは複数の通信チャネルが、 One or more communication channels to each base station according to the traffic of the small cell area,
また、制御基地局にもセルエリア内のトラヒックに応じて1つまたは複数の通信チャネルが割り当てられている。 Also, one or more communication channels according to the traffic in the cell area to control the base station are allocated.

【0018】各基地局17〜20は通信中の移動局の受信品質情報、自局の識別符号および移動局との通信に使用している通信チャネルの番号からなる信号をループ伝送路25に送出し、他の基地局はこの信号を受信するとともに中継し、信号の送出元基地局に対して隣接または近接する予め決められた基地局は、信号中の通信チャネルを受信して通信品質をモニタする。 The reception quality information of each base station 17-20 mobile station in communications, transmits the identification code and the signal formed from that number of communication channels used for communication with the mobile station of its own station to the loop transmission line 25 and, other base station relays which receives this signal, the base station to a predetermined adjacent or close to the delivery source base station signals, monitors the communication quality by receiving a communication channel in the signal to. 制御基地局15は中継される信号を監視し、送出元基地局とこれに隣接または近接する予め決められた基地局の信号が小セルの基地局で通信できない受信品質の劣下や急激なレベル変動の検出を示したときには、自局に割り当てられている通信チャネルの空き通信チャネルに切り替えて通信を継続させる(図2で詳述する)。 Control base station 15 monitors the signal to be relayed, the delivery source base station and this adjacent or close to pre-signal-determined base station degradation under or sudden level of reception quality can not communicate with the base station of the small cell when showing the detection of the variation, to continue the communication by switching the idle communication channel of the communication channel allocated to the own station (detailed in FIG. 2).

【0019】また、制御基地局15は、自局の通信チャネルで通信中の移動局の電波をセル16の内の各基地局17〜20に受信させて該移動局の受信品質情報、自局の識別符号および移動局との通信に使用されている通信チャネルの番号からなる信号をループ伝送路25に送出させ、基地局で通信できる十分な受信品質を検出したときに、通信チャネルを最も良好な受信品質の基地局の空き通信チャネルに切り替えて通信を継続させる(図3で詳述する)。 Further, the control base station 15, the reception quality information by receiving the mobile station radio waves of the mobile station in communication with each base station 17-20 of the cells 16 in the communication channel of the local station, the local station identification code and the signal consisting of number of the communication channel being used for communication with the mobile station is sent to the loop transmission line 25, when detecting a sufficient reception quality that can communicate with the base station, best communication channel to continue the communication by switching the idle communication channel of the base station of the Do reception quality (detailed in Figure 3).

【0020】図2は本発明の一実施例の第1の動作を説明する図であって、29,30は各移動地点における移動局を、31,32は移動局と通信の相手方の基地局の関係を示す線、33,34は移動局の移動経路を示す線である。 [0020] Figure 2 is a diagram illustrating a first operation of one embodiment of the present invention, 29 and 30 the mobile station in the mobile point, the base station of the other party of the communication with the mobile station 31, 32 line indicating the relationship, 33 and 34 is a line indicating a movement path of the mobile station. 今、移動局29が、小セル21内にいて基地局17の通信チャネルで通信を行いながら、矢印33で示すように移動して基地局17の小セルエリアから出たとすると、基地局17、隣接する基地局18、近接する基地局20では十分な通信品質が得られないため、これらの基地局からループ伝送路25に送出された信号は小セルの基地局で通信できない受信品質であることを示す。 Now, the mobile station 29, while performing communication in the communication channel of the base station 17 are in the small cell 21, when exiting from the small cell area of ​​the base station 17 moves as indicated by arrow 33, the base station 17, adjacent base station 18, a sufficient communication quality in the base station 20 to close is not obtained, it sends signals from these base stations to the loop transmission line 25 is a reception quality that can not communicate with the base station of the small cell It is shown.
これを検出した制御基地局15は、自局に割り当てられている通信チャネルの空き通信チャネル番号をループ伝送路25を介して基地局17から移動局30に通知させて通信中チャネル切り替えを行い、通信の継続を可能となる。 This control base station 15 which was detected, and notifies the allowed communication in the channel switched to the mobile station 30 to idle communication channel number of the communication channels allocated to the own station from the base station 17 via the loop transmission line 25, it is possible to continue the communication. また、移動局29が自動車に乗り高速に移動する場合、基地局17、隣接する基地局18、近接する基地局20では急激なレベル変動を検出するため、これらの基地局からループ伝送路25に送出された信号は小セルの基地局で対応できないレベル変動であることを示す。 Also, when the mobile station 29 moves at a high speed ride in an automobile, the base station 17, base station 18 adjacent to detect a sudden level change in the base station 20 adjacent to the loop transmission line 25 from these base stations the sent signal indicates that a not cope level variation at the base station of the small cell.
これを検出した制御基地局15は上記と同様の通信中チャネル切り替えを行い、通信の継続を可能とする。 Control base station detects this 15 performs similar communications in the channel switching as described above, to allow the continuation of the communication. さらに、移動局30が引き続き34で示すように移動して、 Furthermore, by moving as indicated by the mobile station 30 continues 34,
隣の制御基地局のセルに移動する場合は集中制御局14 Central control station 14 when moving to the cell of the control base station of the neighboring
が制御基地局15と隣の制御基地局間で通信中チャネル切り替えを行って通信を継続させる。 There is continuing communication by communicating in the channel switch between the control base station 15 and the adjacent control base station.

【0021】図3は本発明の一実施例の第2の動作を説明する図であって、35〜37は各移動地点における移動局を、38〜40は移動局と通信の相手方の基地局の関係を示す線、41,42は移動局の移動経路を示す線である。 FIG. 3 is a diagram for explaining a second operation of the embodiment of the present invention, 35 to 37 to the mobile station in the mobile point 38-40 base station of the other party of the communication with the mobile station line indicating the relationship, 41 and 42 is a line indicating a movement path of the mobile station. 今、移動局35が、セル16内にいて制御基地局15の通信チャネルで通信を行いながら41で示すように移動して基地局17の小セルエリアに入ったとすると、基地局17では十分な通信品質が得られるため、基地局17からループ伝送路25に送出された信号は小セルの基地局で通信できる受信品質であって、他の基地局18〜20からループ伝送路25に送出された信号よりも良好な受信品質であることを示す。 Now, the mobile station 35, when entered by moving as indicated at 41 while communicating with the communication channel of the control base station 15 are in the cell 16 to the small cell area of ​​the base station 17, sufficient in the base station 17 since the communication quality is obtained, the sent signal from the base station 17 to the loop transmission line 25 is a reception quality that can communicate at the base station of the small cell, transmitted from other base stations 18 to 20 to the loop transmission line 25 than signal indicating a good reception quality. これを検出した制御基地局15は、基地局17に割り当てられている通信チャネルの空き通信チャネル番号を報告するようにループ伝送路25を介して基地局17に指示する。 Control base station 15 detects this instructs the base station 17 via the loop transmission line 25 to report idle communication channel number of the communication channel assigned to the base station 17. 報告を受けた制御基地局15は、移動局36にこれを通知して通信中チャネル切り替えを行い、小セルの基地局17で通信を継続させる。 Control base station 15 having received the report, and notifies to the communication in the channel switch it to the mobile station 36, to continue the communication with the base station 17 of the small cell. なお、移動局35が、例えば自動車電話であって高速に移動する場合、基地局17〜20では急激なレベル変動を検出するため、ループ伝送路25に送出された信号は小セルの基地局で対応できないレベル変動であることを示すことから、制御基地局15はそのまま通信を自局で継続させる。 The mobile station 35, for example, when moving a car phone in a high speed, to detect a sudden level change in the base station 17 to 20, that a signal sent out on the loop transmission line 25 at the base station of the small cell since indicating the level variation can not support, the control base station 15 continues the communication with the own station as it is. さらに、移動局36が引き続き42で示すように隣の基地局18のセルに移動する場合、基地局17と基地局18間で通信中チャネル切り替えを行って通信を継続させる。 Furthermore, when the mobile station 36 moves to the cell of the base station 18 of the next, as subsequently shown at 42, to continue the communication by communicating in channel switching between base station 17 and base station 18.

【0022】以上の説明では、制御基地局として基地局とは独立した局の場合で説明したが、いづれかの基地局が制御基地局の役割を果たす場合にも本発明は適用可能である。 [0022] In the above description, the base station as a control base station described in the case of independent stations, the present invention play a role in Izure of base station control base station is applicable.

【0023】 [0023]

【発明の効果】以上説明したように、本発明によれば、 As described in the foregoing, according to the present invention,
サービスエリア内において、広いセル内の小セルがうまく連続して接していなかったり、少し小セルのサービスエリアから外れても、小セルの基地局から広いセルの基地局に通信チャネルを切り替えて通信を可能とさせることから、移動速度にかかわらず品質の良いサービスを提供することが可能であり、小セル化が進められることから周波数の有効利用が図れる。 In the service area, or not in contact with the small cells in the wide cell well continuously, be outside the service area of ​​a little small cells, by switching a communication channel to the base station of the wide cell from the base station of the small cell communication from be capable of, it is possible to provide a good service quality regardless of the moving speed, can be effectively utilized frequency from the cell downsizing is advanced. さらに、広いセルで通信中にセル内の小セルの基地局で対応できる受信品質情報を検出したときは、通信チャネルを当該基地局の空き通信チャネルに切り替えて通信を継続させるので、すなわちできるだけセル半径の大きい基地局から小さい基地局に通信チャネルを切り替えることから周波数の有効利用が図られ、大容量のシステムを実現することができる。 Furthermore, when detecting the reception quality information can be dealt with a base station of the small cells in the cell during communication in a wide cell, the communication channel so to continue the communication by switching the idle communication channels in the base station, i.e. possible cell frequency from switching the communication channel in small base stations from the large radius of the base station effective use is achieved, it is possible to realize a large capacity system.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の一実施例に係わるセルラ移動通信方式の説明図である。 1 is an illustration of a cellular mobile communication system according to an embodiment of the present invention.

【図2】図1に示すセルラ移動通信方式の第1の動作を示す説明図である。 FIG. 2 is an explanatory diagram showing a first operation of the cellular mobile communication system shown in FIG.

【図3】図1に示すセルラ移動通信方式の第2の動作を示す説明図である。 3 is an explanatory diagram showing a second operation of the cellular mobile communication system shown in FIG.

【図4】従来のセルラ移動通信方式の説明図である。 4 is an explanatory diagram of a conventional cellular mobile communication system.

【符号の説明】 14 集中制御局 15 制御基地局 16 セル 17,18,19,20 基地局 21,22,23,24 小セル 25 ループ状伝送路 [Description of Reference Numerals] 14 central control station 15 controls the base station 16 cells 17, 18, 19, 20 base station 21, 22, 23, 24 small cells 25 looped transmission path

Claims (1)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 各々複数の小セルを包含するセルを自己のエリアとする複数の制御基地局と、複数の制御基地局を集中的に制御する集中制御局と、各セル内における複数の小セルにそれぞれ設けられた複数の基地局と、各セルにおける複数の基地局および制御基地局をループ状に接続するループ状伝送路とを設け、各基地局は通信中の移動局の受信品質情報、自局の識別符号および移動局との通信に使用している通信チャネルの番号からなる信号をループ状伝送路に送出し、各基地局はループ状伝送路に接続されている上記基地局からの該信号を受信するとともに下位基地局に中継し、制御基地局は各基地局がループ状伝送路に送出する通信中の移動局の受信品質情報を監視して、受信品質が所定の第1の条件を満たした場合に、通信を行って 1. A plurality of control base station the cell including each a plurality of small cells and its area, a plurality of small and centralized control station, within each cell to centrally control a plurality of control base stations a plurality of base stations respectively provided, and a loop-shaped transmission line connecting a plurality of base stations and controls the base station in a loop in each cell is provided to the cell, the reception quality information of each base station is the mobile station in communication , a signal consisting of number of the communication channel used for communication with the own station identification code and the mobile station sends to the loop transmission line, each base station from the base station connected to the loop transmission line and relayed to the lower base station which receives the said signal, the control base station monitors the reception quality information the mobile station in communications in which each base station is sent to the loop transmission line, a first reception quality of a predetermined if it meets the conditions, performs communication いる当該基地局の通信チャネルから自己のセルに割り当てられている通信チャネル内の空き通信チャネルに切り替えて通信を継続させ、移動局がセルをまたがって移動する場合には、集中制御局が制御基地局間でチャネルを切り替えて通信を継続させ、制御基地局は制御基地局の通信チャネルで通信中の移動局の電波をセル内の各基地局に受信させて各基地局がループ状伝送路に送出する受信品質情報を監視し、受信品質が所定の第2の条件を満たした場合に、最も良好な受信品質の基地局の空き通信チャネルに通信チャネルを切り替えて通信を継続させ、移動局が小セルをまたがって移動する場合には、基地局間でチャネルを切り替えて通信を継続させることを特徴とするセルラ移動通信方式。 Switch from the communication channel of the base station being in idle communication channel in a communication channel assigned to its own cells allowed to continue communication, when the mobile station moves across cells, the centralized control station controlling base switch the channel to continue communication between the stations, the control base station in a loop transmission line by each base station by receiving the respective base stations in the radio wave of the mobile station in communication with the communication channel of the control base station cell the reception quality information to be sent to the monitoring, when the reception quality satisfies a predetermined second condition, to continue the communication by switching a communication channel best reception free communication channel of the base station of the quality, the mobile station when moving across the small cells is a cellular mobile communication system, characterized in that to continue the communication by switching a channel between base station.
JP21216991A 1991-08-23 1991-08-23 Cellular mobile communication system Expired - Lifetime JP2946492B2 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07193852A (en) * 1993-12-27 1995-07-28 Nec Corp Ring network communication equipment
JPH07193853A (en) * 1993-12-27 1995-07-28 Nec Commun Syst Ltd Communication channel changeover method and system for mobile communication
US5651683A (en) * 1994-06-06 1997-07-29 Kansei Corporation Structure for connector arrangement for vehicles
US6831904B1 (en) 1999-07-28 2004-12-14 Ntt Docomo, Inc. Cluster structured mobile communication system base station, cluster control station, line control station and mobile station
KR100842523B1 (en) * 2006-11-21 2008-07-01 삼성전자주식회사 Radio resource management technique for cellular systems using wireline relay stations
US9758953B2 (en) 2012-03-21 2017-09-12 Bradley Fixtures Corporation Basin and hand drying system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07193852A (en) * 1993-12-27 1995-07-28 Nec Corp Ring network communication equipment
JPH07193853A (en) * 1993-12-27 1995-07-28 Nec Commun Syst Ltd Communication channel changeover method and system for mobile communication
US5651683A (en) * 1994-06-06 1997-07-29 Kansei Corporation Structure for connector arrangement for vehicles
US6831904B1 (en) 1999-07-28 2004-12-14 Ntt Docomo, Inc. Cluster structured mobile communication system base station, cluster control station, line control station and mobile station
KR100842523B1 (en) * 2006-11-21 2008-07-01 삼성전자주식회사 Radio resource management technique for cellular systems using wireline relay stations
US7969940B2 (en) 2006-11-21 2011-06-28 Samsung Electronics Co., Ltd. Method and system for assigning radio resources in cellular system using wired relay stations
US9758953B2 (en) 2012-03-21 2017-09-12 Bradley Fixtures Corporation Basin and hand drying system

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