JP3316154B2 - Communication method and communication device - Google Patents
Communication method and communication deviceInfo
- Publication number
- JP3316154B2 JP3316154B2 JP34183196A JP34183196A JP3316154B2 JP 3316154 B2 JP3316154 B2 JP 3316154B2 JP 34183196 A JP34183196 A JP 34183196A JP 34183196 A JP34183196 A JP 34183196A JP 3316154 B2 JP3316154 B2 JP 3316154B2
- Authority
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- Japan
- Prior art keywords
- frequency
- base station
- communication
- electric field
- mobile
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は移動通信システムに
用いて好適な通信方法および通信装置に関し、特に割り
当てられた使用可能周波数資源が少ない小規模基地局
や、使用周波数を自律的に決定する基地局等、同一周波
数における干渉が発生し易い基地局を含む移動通信シス
テムに用いて好適な通信方法および通信装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication method and a communication apparatus suitable for use in a mobile communication system. The present invention relates to a communication method and a communication apparatus suitable for use in a mobile communication system including a base station in which interference at the same frequency easily occurs, such as a station.
【０００２】[0002]
【従来の技術】一般の移動通信システムにおいては、同
一周波数の相互干渉が発生しないように、各基地局に割
り当る周波数が決定される。換言すれば、各基地局の配
置に基づいて、技術者の人為的作業によって周波数割当
が決定されていた。しかし、かかる技術においては、新
たな基地局を設置したり既存の基地局の周波数割当を変
更したりする毎に煩雑な作業が必要になる。また、一部
の基地局における一時的なトラフィック量の増大に対し
て柔軟に対処することも困難である。2. Description of the Related Art In a general mobile communication system, a frequency assigned to each base station is determined so that mutual interference of the same frequency does not occur. In other words, based on the arrangement of each base station, the frequency assignment has been determined by a manual operation of a technician. However, in such a technique, complicated work is required every time a new base station is installed or the frequency allocation of an existing base station is changed. It is also difficult to flexibly cope with a temporary increase in traffic volume in some base stations.
【０００３】このため、小規模基地局等においては、周
辺の状況に応じて、自局が使用可能な周波数を自律的に
決定するものが知られている。この場合、しばしば近傍
の他の基地局と同一の周波数を「使用可能である」と決
定してしまうこともある。このため、移動機は、割り当
てられた周波数を実際に使用する前に、当該周波数の電
界強度を測定し、近傍の基地局で当該周波数が使用され
ていないことを予め確認する必要がある。[0003] For this reason, there is known a small-scale base station or the like that autonomously determines a frequency that can be used by its own station according to the surrounding situation. In this case, the same frequency as another nearby base station is often determined to be “usable”. For this reason, before actually using the allocated frequency, the mobile station needs to measure the electric field strength of the frequency and confirm in advance that the frequency is not used by a nearby base station.
【０００４】[0004]
【発明が解決しようとする課題】しかし、移動機におい
て上述した確認動作が行われたとしても、依然として同
一周波数において干渉が発生する可能性がある。その詳
細を、実施形態に係る図１を流用して説明する。図にお
いて基地局１および基地局２（小規模基地局）は一部に
おいてゾーンが重複している。そして、基地局２におい
ては、基地局１に割り当てられている周波数ｆ1が「使
用可能である」と判定されている。However, even if the above-described confirmation operation is performed in the mobile device, there is still a possibility that interference will still occur at the same frequency. The details will be described with reference to FIG. 1 according to the embodiment. In the figure, the base station 1 and the base station 2 (small base station) partially overlap zones. Then, the base station 2 determines that the frequency f 1 assigned to the base station 1 is “usable”.
【０００５】次に、移動機３が地点Ａにおいて基地局２
のゾーンに在圏し、基地局２の報知チャンネル等を介し
て、「周波数ｆ1が使用可能である」旨が通知される。
そこで、移動機３は周波数ｆ1の電界レベルを測定する
が、地点Ａは基地局１から離れているため、周波数ｆ1
の電界レベルは充分に低い値になる。従って、移動機３
においても「周波数ｆ1は使用可能である」旨が判定さ
れ、周波数ｆ1を用いて基地局２と移動機３との間で通
信が開始される。[0005] Next, the mobile station 3 moves to the base station 2 at the point A.
And the fact that “frequency f 1 is usable” is notified via a broadcast channel or the like of base station 2.
Then, the mobile device 3 measures the electric field level of the frequency f 1 , but since the point A is far from the base station 1, the frequency f 1
Has a sufficiently low electric field level. Therefore, mobile unit 3
Is determined, "frequency f 1 is usable" is determined, and communication between base station 2 and mobile station 3 is started using frequency f 1 .
【０００６】その後、移動機３が地点Ｂに移動すると、
移動機３が基地局１のゾーンにも属することになる。地
点Ｂにおいては、希望波（基地局２からの電波）のレベ
ルは充分に高く、希望波ほどではないが妨害波（基地局
１からの電波）のレベルも高くなっている。かかる状態
においては、移動機３から放射される上り信号が基地局
１のシステムに干渉を与えてしまう可能性がある。Then, when the mobile unit 3 moves to the point B,
The mobile station 3 also belongs to the zone of the base station 1. At the point B, the level of the desired wave (radio wave from the base station 2) is sufficiently high, and the level of the interfering wave (radio wave from the base station 1) is also high, although not as high as the desired wave. In such a state, there is a possibility that the uplink signal radiated from the mobile device 3 may interfere with the system of the base station 1.
【０００７】また、干渉を移動機によって測定するため
の種々の技術が知られているが、現在割り当てられてい
る周波数における同一周波数の干渉を測定する技術は知
られていない。すなわち、公知の種々の技術において
は、干渉の測定は、ゾーン切換やチャンネル切換を行う
場合に切換先の周波数について行われるものであり、既
に通信に供されている周波数に対して干渉の測定を行う
ことは不可能であった。Further, various techniques for measuring interference by a mobile station are known, but techniques for measuring interference of the same frequency at a currently allocated frequency are not known. That is, in various known techniques, the measurement of interference is performed on the frequency of the switching destination when performing zone switching or channel switching, and the interference measurement is performed on the frequency already provided for communication. It was impossible to do.
【０００８】この発明は上述した事情に鑑みてなされた
ものであり、同一周波数における干渉を簡易かつ的確に
検出する通信方法および通信装置を提供することを目的
とする。The present invention has been made in view of the above-mentioned circumstances, and has as its object to provide a communication method and a communication apparatus for easily and accurately detecting interference at the same frequency.
【０００９】[0009]
【課題を解決するための手段】上記課題を解決するため
請求項１記載の構成にあっては、第１の周波数を用いて
通信を行う第１過程と、第２の周波数を用いて通信を行
いつつ、前記第１の周波数における電界強度を測定する
第２過程と、測定した電界強度が所定値以下の場合に、
通信に供される周波数を前記第１の周波数に戻す第３過
程とを有することを特徴とする。According to a first aspect of the present invention, there is provided a communication apparatus comprising: a first step of performing communication using a first frequency; and a first step of performing communication using a second frequency. While performing, the second step of measuring the electric field strength at the first frequency, and when the measured electric field strength is equal to or less than a predetermined value,
A third step of returning the frequency provided for communication to the first frequency.
【００１０】さらに、請求項２記載の構成にあっては、
請求項１記載の通信方法において、前記第１過程におい
て前記第２の周波数の電界強度を測定するとともに、前
記第２過程の実行時間は前記第１過程の実行時間よりも
短いことを特徴とする。Further, in the configuration according to claim 2,
2. The communication method according to claim 1, wherein the electric field intensity of the second frequency is measured in the first step, and an execution time of the second step is shorter than an execution time of the first step. .
【００１１】また、請求項３記載の構成にあっては、第
１のゾーン内で第１の周波数を用いて通信する第１の基
地局と、前記第１のゾーンと一部が重複する第２のゾー
ン内で前記第１の周波数を用いて通信する第２の基地局
とを有する移動通信システムに用いられる通信方法であ
って、前記第１の周波数を用いて、前記第２の基地局
と、前記第２のゾーンに属する移動機とが通信を行う過
程と、前記移動機が、第２の周波数を用いて前記第２の
基地局と通信を行いつつ、前記第１の周波数の電界強度
を測定する過程と、この測定した電界強度が所定値を越
える旨を、前記移動機が前記第２の基地局に通知する過
程と、前記通知に基づいて、前記第２の基地局が前記第
１の周波数の使用を禁止する過程とを有することを特徴
とする。Further, in the configuration according to the third aspect, a first base station that communicates using a first frequency in a first zone and a first base station that partially overlaps the first zone. A communication method used in a mobile communication system having a second base station that communicates using the first frequency within the second zone, wherein the second base station uses the first frequency. And a step in which a mobile station belonging to the second zone communicates with the mobile station. The mobile station communicates with the second base station using a second frequency while receiving an electric field of the first frequency. A step of measuring the strength, a step in which the mobile station notifies the second base station that the measured electric field strength exceeds a predetermined value, and based on the notification, the second base station Prohibiting use of the first frequency.
【００１２】また、請求項４記載の構成にあっては、第
１の周波数を用いて通信を行い、第２の周波数を用いて
通信を行いつつ、前記第１の周波数における電界強度を
測定し、測定した電界強度が所定値以下の場合に、通信
に供される周波数を前記第１の周波数に戻すことを特徴
とする。Further, in the configuration according to the fourth aspect, the communication is performed using the first frequency and the communication is performed using the second frequency, and the electric field strength at the first frequency is measured. When the measured electric field strength is equal to or less than a predetermined value, the frequency used for communication is returned to the first frequency.
【００１３】[0013]
１．実施形態の構成 次に、本発明の一実施形態の構成を図２を参照し説明す
る。図において基地局２には、移動機３に各種信号を送
信する送信機２１と、移動機３から送信された信号を受
信する受信機２２とが設けられている。２３は処理制御
部であり、送信機２１、受信機２２、その他基地局設備
全体を制御する。２４はタイマ回路であり、処理制御部
２３に対して必要に応じてタイマ割り込みを発生させ
る。２５は記憶回路であり、処理制御部２３で実行され
る制御プログラムを格納するプログラムメモリと、該制
御プログラムで使用されるワーキングメモリとから構成
されている。1. Configuration of Embodiment Next, a configuration of an embodiment of the present invention will be described with reference to FIG. In the figure, a base station 2 is provided with a transmitter 21 for transmitting various signals to the mobile device 3 and a receiver 22 for receiving a signal transmitted from the mobile device 3. A processing control unit 23 controls the transmitter 21, the receiver 22, and the entire base station equipment. Reference numeral 24 denotes a timer circuit which causes the processing control unit 23 to generate a timer interrupt as necessary. Reference numeral 25 denotes a storage circuit, which includes a program memory for storing a control program executed by the processing control unit 23, and a working memory used in the control program.
【００１４】同様に、移動機３は、基地局２等の基地局
に各種信号を送信する送信機３１と、基地局から送信さ
れた信号を受信する受信機３２と、移動機全体を制御す
る処理制御部３３と、処理制御部３３に対して必要に応
じてタイマ割り込みを発生させるタイマ回路３４と、プ
ログラムメモリとワーキングメモリとを含む記憶回路３
５とから構成されている。なお、受信機３２は受信周波
数の電界強度測定器も内臓している。Similarly, the mobile station 3 controls a transmitter 31 for transmitting various signals to a base station such as the base station 2, a receiver 32 for receiving a signal transmitted from the base station, and the entire mobile station. A processing control unit 33, a timer circuit 34 for generating a timer interrupt to the processing control unit 33 as necessary, and a storage circuit 3 including a program memory and a working memory.
And 5. Note that the receiver 32 also has a built-in electric field strength measuring device for the reception frequency.
【００１５】２．実施形態の動作 (１)周波数の報知 次に、本実施形態の動作を説明する。基地局２は、在圏
する移動機に対して、報知チャンネルを介して、移動機
に新規に割当可能な複数の周波数を定期的に報知する。
そして、各移動機においては、これら報知された周波数
（以下、周波数リストという）が記憶回路３５に記憶さ
れる。このように、記憶回路３５内の周波数リストは、
最新のものに逐次更新される。2. Operation of Embodiment (1) Notification of Frequency Next, the operation of this embodiment will be described. The base station 2 periodically broadcasts a plurality of frequencies that can be newly allocated to the mobile station to a mobile station located therein via a broadcast channel.
Then, in each mobile device, these notified frequencies (hereinafter, referred to as frequency lists) are stored in the storage circuit 35. Thus, the frequency list in the storage circuit 35 is
It is updated sequentially to the latest one.
【００１６】(２)通信等 次に、通信等の具体的な動作を図４，５を参照し説明す
る。まず、基地局２においては、図４のステップＳＰ１
０１が実行される。ここでは基地局２において全チャン
ネル測定が行われ、使用可能な周波数が判定されるとと
もに記憶回路２５に記憶される。そして、記憶された周
波数リスト中から、運用周波数ｆUSE、および予備運用
周波数ｆTMPが選択される。ここでは、一例として、運
用周波数ｆUSEとして周波数ｆ1、予備運用周波数ｆTMP
として周波数ｆ2が選択されたこととする。(2) Communication etc. Next, specific operations such as communication will be described with reference to FIGS. First, in the base station 2, step SP1 of FIG.
01 is executed. Here, the base station 2 measures all channels, determines usable frequencies, and stores them in the storage circuit 25. Then, the operating frequency f USE and the standby operating frequency f TMP are selected from the stored frequency list. Here, as an example, as the operation frequency f USE , the frequency f 1 , the preliminary operation frequency f TMP
And the frequency f 2 is selected as.
【００１７】この後、移動機３が在圏すると、処理がス
テップＳＰ１０２に進む。このとき、運用周波数ｆUSE
＝ｆ1、および予備運用周波数ｆTMP＝ｆ2が基地局２か
ら移動機３に通知される。移動機３では、ステップＳＰ
１として、通知された運用周波数ｆUSE、および予備運
用周波数ｆTMPが記憶回路３５に記憶される。これを受
けて、移動機３はステップＳＰ２に移行し、ステップＳ
Ｐ１０３に移行した基地局２との間で運用周波数ｆUSE
＝ｆ1を用いて通信が行われる。Thereafter, when the mobile device 3 is located, the process proceeds to step SP102. At this time, the operating frequency f USE
= F 1 and the standby frequency f TMP = f 2 are notified from the base station 2 to the mobile station 3. In the mobile device 3, the step SP
As 1, the notified operating frequency f USE and spare operating frequency f TMP are stored in the storage circuit 35. In response to this, the mobile station 3 proceeds to step SP2 and proceeds to step S2.
The operating frequency f USE between the base station 2 that has shifted to P103
= Communication is performed by using the f 1.
【００１８】ところで、タイマ回路２４は、所定時間毎
に処理制御部２３にタイマ割り込みを発生させる。タイ
マ割り込みが発生すると、基地局２の処理はステップＳ
Ｐ１０４に進む。ここでは、運用周波数ｆUSEと予備運
用周波数のｆTMPとを入れ替える旨が、移動機３に通知
される。The timer circuit 24 causes the processing control unit 23 to generate a timer interrupt every predetermined time. When a timer interrupt occurs, the processing of the base station 2 proceeds to step S
Proceed to P104. Here, the mobile device 3 is notified that the operating frequency f USE and the spare operating frequency f TMP are to be exchanged.
【００１９】移動機３への通知が送信されると、基地局
２における処理は直ちに次のステップＳＰ１０５へ移
り、運用周波数ｆUSEと、予備運用周波数のｆTMPとが入
れ換えられる。すなわち、運用周波数ｆUSE＝ｆ2、予備
運用周波数ｆTMP＝ｆ1に設定されることになる。移動機
３にあっては、ステップＳＰ３において基地局２からの
運用周波数切り替え通知を受信するとステップＳＰ６に
移行し、通信に用いている運用周波数ｆUSEが、先の予
備運用周波数のｆTMPすなわち周波数ｆ2に変更される。When the notification to the mobile station 3 is transmitted, the processing in the base station 2 immediately proceeds to the next step SP105, where the operating frequency f USE and the spare operating frequency f TMP are exchanged. That is, the operating frequency f USE = f 2 and the spare operating frequency f TMP = f 1 are set. In the mobile station 3, upon receiving the operating frequency switching notification from the base station 2 in step SP3, the process proceeds to step SP6, where the operating frequency f USE used for communication is set to f TMP of the previous standby operating frequency, that is, the frequency. It is changed to f 2.
【００２０】一方、移動機３が基地局２からの運用周波
数切り替え通知を受信できない場合は、移動機３の運用
周波数は変更されない。しかし、基地局２の運用周波数
はステップＳＰ１０５で既に変わってしまっているた
め、移動機３は基地局と通信できずに、ステップＳＰ４
において通信断の状態となる。この通信断の状態になる
と、移動機３における処理は、次のステップＳＰ５に移
行する。ここでは、移動機３内の記憶回路３５に記載さ
れていた運用予備周波数が順に検索される。On the other hand, when the mobile station 3 cannot receive the operating frequency switching notification from the base station 2, the operating frequency of the mobile station 3 is not changed. However, since the operating frequency of the base station 2 has already been changed in step SP105, the mobile station 3 cannot communicate with the base station, and
In this case, the communication is disconnected. When the communication is disconnected, the process in the mobile device 3 proceeds to the next step SP5. Here, the operation spare frequency described in the storage circuit 35 in the mobile device 3 is sequentially searched.
【００２１】次に、ステップＳＰ６においては、この検
索結果に基づいて、通信に供される運用周波数ｆ
USEが、予備運用周波数のｆTMPすなわち周波数ｆ2に変
更され、予備運用周波数ｆTMPは先の運用周波数ｆUSEす
なわち周波数ｆ1に変更される。このように、移動機３
が万一基地局２の運用予備周波数切り替え通知を受信で
きなかった場合においても、通信断の状態をを短時間に
抑えることが可能である。Next, in step SP6, based on the search result, the operating frequency f
USE is changed to f TMP or frequency f 2 of the preliminary operating frequency, the preliminary operating frequency f TMP is changed to the operating frequency f USE i.e. the frequency f 1 Former. Thus, the mobile device 3
However, even if the operation standby frequency switching notification of the base station 2 cannot be received, it is possible to suppress the state of communication interruption in a short time.
【００２２】以後、移動機３に関してはステップＳＰ７
で、基地局２に関してはステップＳＰ１０６において、
新たに設定された運用数端数ｆUSE＝ｆ2を用いて相互に
通信が行われる。この時、移動機３において通話中でな
ければ、処理はステップＳＰ８に進み、ｆTMP＝ｆ1の電
界強度が測定され、予備運用周波数ｆTMPが基地局２ま
たは周辺の他の基地局で使用中であるか否か、すなわち
電界強度が所定内であったか否かが、判定される。この
結果は、次のステップＳＰ９において、基地局２に通知
される。Thereafter, the mobile station 3 is set to step SP7.
Then, regarding the base station 2, in step SP106,
Mutual communication is performed using the newly set operation number fraction f USE = f 2. At this time, if the mobile station 3 is not busy, the process proceeds to step SP8, where the electric field strength of f TMP = f 1 is measured, and the standby frequency f TMP is used by the base station 2 or another base station in the vicinity. It is determined whether or not the current is in the middle, that is, whether or not the electric field strength is within a predetermined range. This result is reported to the base station 2 in the next step SP9.
【００２３】さて、基地局２に移動機３からの測定結果
が報告されると、処理はステップＳＰ１０７に進む。こ
こで「使用中である」との報告が届くと処理はステップ
ＳＰ１０８に移る。ここで、記憶回路２５の周波数リス
トに変更が加わり、干渉有りと判定された当該予備運用
周波数ｆTMPは、以後使用が禁止される（図３（ａ）参
照）。その後、ステップＳＰ１０１の過程を経て、ｆ
TMPは記憶回路２５に記憶された周波数リストから選択
された別の周波数に置き換えられる。そして、運用周波
数ｆUSEは、タイマによる割り込みが発生するまでその
まま用いられる。When the measurement result from the mobile station 3 is reported to the base station 2, the processing proceeds to step SP107. Here, when the report “in use” arrives, the process proceeds to step SP108. Here, the frequency list of the storage circuit 25 is changed, and the reserve operation frequency f TMP determined to have interference is prohibited from being used thereafter (see FIG. 3A). After that, through the process of step SP101, f
TMP is replaced with another frequency selected from the frequency list stored in the storage circuit 25. Then, the operating frequency f USE is used as it is until an interruption by the timer occurs.
【００２４】一方、ステップ１０７で「使用中ではな
い」と判定されると、処理は処理はステップＳＰ１０９
に進み、運用周波数ｆUSEと予備運用周波数ｆTMPとを入
れ替える旨が移動機３に通知される。そして、移動機３
および基地局２において各々ステップＳＰ１２およびス
テップＳＰ１１０が実行されると、両者の運用周波数ｆ
USEと予備運用周波数ｆTMPとが入れ換えられる。すなわ
ち、運用周波数ｆUSEは周波数ｆ1、予備運用周波数ｆ
TMPは周波数ｆ2に設定される。On the other hand, in step 107, the message "
Is determined to be "Yes", the processing proceeds to step SP109.
To the operating frequency fUSEAnd the preliminary operating frequency fTMPAnd enter
The mobile device 3 is notified of the replacement. And mobile device 3
And at the base station 2 at step SP12 and step
When step SP110 is executed, both operating frequencies f
USEAnd the preliminary operating frequency fTMPIs replaced. Sand
And operating frequency fUSEIs the frequency f1, Preliminary operation frequency f
TMPIs the frequency fTwoIs set to
【００２５】ここで、新たな運用周波数ｆUSEである周
波数ｆ1は、直前に実行されたステップＳＰ８〜１０の
処理において干渉の無かった旨が判明しているのである
から、通信に供される周波数としてきわめて安全であ
る。以後、タイマによる割り込みが発生するまで、周波
数ｆ1が運用周波数ｆUSEとしてそのまま用いられる。こ
の後、上述したのと同様の動作が繰り返される。Here, the frequency f 1, which is the new operating frequency f USE , is used for communication since it is known that there is no interference in the processing of steps SP 8 to SP executed immediately before. Very safe as a frequency. Thereafter, the frequency f 1 is used as it is as the operating frequency f USE until an interrupt is generated by the timer. Thereafter, the same operation as described above is repeated.
【００２６】なお、本発明は上記実施形態に限定される
ものではなく、種々の変形が可能である。例えば、上記
実施形態においては運用周波数ｆUSEが「運用周波数の
軸」として主として使用され、予備運用周波数ｆTMPは
一時的に使用された。しかし、図３(b)に示すように、
特に軸となる周波数を定めることなく運用周波数を変遷
させてもよい。Note that the present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above embodiment, the operating frequency f USE is mainly used as the “axis of the operating frequency”, and the spare operating frequency f TMP is temporarily used. However, as shown in FIG.
In particular, the operating frequency may be changed without defining the axis frequency.
【００２７】[0027]
【発明の効果】以上説明したようにこの発明によれば、
第２の周波数を用いて通信を行いつつ、第１の周波数に
おける電界強度を測定し、測定した電界強度が所定値以
下の場合に、通信に供される周波数を第１の周波数に戻
すから、第１の周波数における干渉を簡易かつ的確に検
出することができる。As described above, according to the present invention,
While performing communication using the second frequency, the electric field strength at the first frequency is measured, and when the measured electric field strength is equal to or less than a predetermined value, the frequency provided for communication is returned to the first frequency. The interference at the first frequency can be easily and accurately detected.
【図１】一実施形態の動作説明図である。FIG. 1 is an operation explanatory diagram of one embodiment.
【図２】上記実施形態における基地局２および移動機３
のブロック図である。FIG. 2 shows a base station 2 and a mobile station 3 in the embodiment.
It is a block diagram of.
【図３】一実施形態および変形例の動作説明図である。FIG. 3 is an operation explanatory diagram of one embodiment and a modified example.
【図４】処理制御部２３および処理制御部３３内で実行
される処理プログラムのフローチャートである。FIG. 4 is a flowchart of a processing program executed in the processing control unit 23 and the processing control unit 33;
【図５】処理制御部２３および処理制御部３３内で実行
される処理プログラムのフローチャートである。FIG. 5 is a flowchart of a processing program executed in the processing control unit 23 and the processing control unit 33;
１ 基地局（第１の基地局） ２ 基地局（第２の基地局） ３ 移動機 ２１ 送信機 ２２ 受信機 ２３ 処理制御部 ２４ タイマ回路 ２５ 記憶回路 ３１ 送信機 ３２ 受信機 ３３ 処理制御部 ３４ タイマ回路 ３５ 記憶回路 Reference Signs List 1 base station (first base station) 2 base station (second base station) 3 mobile station 21 transmitter 22 receiver 23 processing control unit 24 timer circuit 25 storage circuit 31 transmitter 32 receiver 33 processing control unit 34 Timer circuit 35 Storage circuit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 柿沼 和彦 東京都港区虎ノ門二丁目10番１号 エ ヌ・ティ・ティ移動通信網株式会社内 (56)参考文献 特開 平９−168182（ＪＰ，Ａ) 特開 平７−67169（ＪＰ，Ａ) 特開 平３−89636（ＪＰ，Ａ) 特開 平４−213931（ＪＰ，Ａ) 特公 昭61−32857（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) H04B 7/26 H04B 1/74 H04B 17/00 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kazuhiko Kakinuma 2-10-1 Toranomon, Minato-ku, Tokyo Inside NTT Mobile Communication Network Co., Ltd. (56) References JP-A-9-168182 (JP) JP-A-7-67169 (JP, A) JP-A-3-89636 (JP, A) JP-A-4-213931 (JP, A) JP-B-61-32857 (JP, B2) (58) Field surveyed (Int. Cl. 7 , DB name) H04B 7/26 H04B 1/74 H04B 17/00
Claims (4)
程と、 第２の周波数を用いて通信を行いつつ、前記第１の周波
数における電界強度を測定する第２過程と、 測定した電界強度が所定値以下の場合に、通信に供され
る周波数を前記第１の周波数に戻す第３過程とを有する
ことを特徴とする通信方法。1. A first step of performing communication using a first frequency, and a second step of measuring electric field strength at the first frequency while performing communication using a second frequency. A third step of returning the frequency provided for communication to the first frequency when the electric field strength is equal to or less than a predetermined value.
の電界強度を測定するとともに、前記第２過程の実行時
間は前記第１過程の実行時間よりも短いことを特徴とす
る請求項１記載の通信方法。2. The method according to claim 1, wherein in the first step, the electric field intensity of the second frequency is measured, and an execution time of the second step is shorter than an execution time of the first step. Communication method.
通信する第１の基地局と、前記第１のゾーンと一部が重
複する第２のゾーン内で前記第１の周波数を用いて通信
する第２の基地局とを有する移動通信システムに用いら
れる通信方法であって、 前記第１の周波数を用いて、前記第２の基地局と、前記
第２のゾーンに属する移動機とが通信を行う過程と、 前記移動機が、第２の周波数を用いて前記第２の基地局
と通信を行いつつ、前記第１の周波数の電界強度を測定
する過程と、 この測定した電界強度が所定値を越える旨を、前記移動
機が前記第２の基地局に通知する過程と、 前記通知に基づいて、前記第２の基地局が前記第１の周
波数の使用を禁止する過程とを有することを特徴とする
通信方法。3. A first base station that communicates using a first frequency in a first zone, and a first base station that communicates in a second zone that partially overlaps the first zone. A communication method used in a mobile communication system having a second base station that performs communication by using the first base station, wherein the mobile station belongs to the second base station using the first frequency. And the mobile station communicates with the second base station using a second frequency while measuring the electric field strength of the first frequency, and the measured electric field A step in which the mobile station notifies the second base station that the strength exceeds a predetermined value; and a step in which the second base station prohibits use of the first frequency based on the notification. A communication method comprising:
数における電界強度を測定し、 測定した電界強度が所定値以下の場合に、通信に供され
る周波数を前記第１の周波数に戻すことを特徴とする通
信装置。4. A method of performing communication using a first frequency and measuring an electric field strength at the first frequency while performing communication using a second frequency, wherein the measured electric field strength is equal to or less than a predetermined value. A communication device for returning a frequency used for communication to the first frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34183196A JP3316154B2 (en) | 1996-12-20 | 1996-12-20 | Communication method and communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34183196A JP3316154B2 (en) | 1996-12-20 | 1996-12-20 | Communication method and communication device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10190553A JPH10190553A (en) | 1998-07-21 |
| JP3316154B2 true JP3316154B2 (en) | 2002-08-19 |
Family
ID=18349095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34183196A Expired - Lifetime JP3316154B2 (en) | 1996-12-20 | 1996-12-20 | Communication method and communication device |
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| Country | Link |
|---|---|
| JP (1) | JP3316154B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8412274B2 (en) | 2006-06-08 | 2013-04-02 | Hitachi Kokusai Electric Inc. | Wireless base station device |
| US8682332B2 (en) * | 2008-02-26 | 2014-03-25 | Qualcomm Incorporated | Efficient frequency assignment for mobile devices in coexisting wireless communication systems |
| US9810242B2 (en) | 2013-05-31 | 2017-11-07 | Eaton Corporation | Hydraulic system and method for reducing boom bounce with counter-balance protection |
-
1996
- 1996-12-20 JP JP34183196A patent/JP3316154B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10190553A (en) | 1998-07-21 |
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