JPH10271552A - Method for detecting movement of base station in mobile communication system - Google Patents
Method for detecting movement of base station in mobile communication systemInfo
- Publication number
- JPH10271552A JPH10271552A JP9068435A JP6843597A JPH10271552A JP H10271552 A JPH10271552 A JP H10271552A JP 9068435 A JP9068435 A JP 9068435A JP 6843597 A JP6843597 A JP 6843597A JP H10271552 A JPH10271552 A JP H10271552A
- Authority
- JP
- Japan
- Prior art keywords
- base station
- receiving base
- receiving
- transmission
- mobile communication
- 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.)
- Withdrawn
Links
- 238000010295 mobile communication Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 24
- 230000005540 biological transmission Effects 0.000 claims abstract description 49
- 238000005259 measurement Methods 0.000 claims description 15
- 238000004891 communication Methods 0.000 description 16
- 230000005684 electric field Effects 0.000 description 13
- 238000012545 processing Methods 0.000 description 12
- 238000005562 fading Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000001413 cellular effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、移動体通信システ
ムにおいて、移動する送信基地局の移動状態を検出し、
それを用いて周波数帯域を有効利用する移動体通信シス
テムにおける基地局の移動検出方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system for detecting a moving state of a moving transmitting base station.
The present invention relates to a method for detecting movement of a base station in a mobile communication system using the frequency band effectively.
【０００２】[0002]
【従来の技術】従来、このような分野の技術としては、
例えば、次のような文献に記載されるものがあった。 文献１：桑原守二監修“自動車電話”（昭６０−２−２
０）、電子情報通信学会、P.23-25 文献２：進士昌明編著“無線通信の電波伝搬”（平４−
２−２０）、電子情報通信学会、P.96-98 文献３：奥村善久、進士昌明監修“移動通信の基礎”
（昭６１−１０−１）電子情報通信学会、P.62-64 何時でも、どこでも、だれとでも通信することを可能に
する移動体通信システムは、通信の究極的な形態のひと
つであり、近年の自動車電話や携帯電話に代表されるよ
うに、急速に普及しつつある。ところが、普及の増加に
伴いその周波数帯域の不足が懸念されている。自動車電
話や携帯電話等では、自動車電話や携帯電話等の各端末
をマクロセル単位で収容するマクロセルラー方式が採用
されている。マクロセルラー方式では、端末にサービス
を提供する１つの受信基地局のサービスエリアが数キロ
メートルと広いため、移動する端末に対するセルの切り
替えが十分に可能である。一方、ＰＨＳに代表されるマ
イクロセルを用いたマイクロセルラー方式では、１つの
受信基地局のサービスエリアが数百メートルと狭い。よ
って、周波数の有効利用は可能になるが、移動する端末
に対するセルの切り替え成功率が、マクロセルラー方式
に比べて劣る。従って、周波数利用効率とセルの切り替
え成功率の両方を確保するためには、マクロセルとマイ
クロセルを重畳した階層型セルの構成が必要となると共
に、端末の移動状態により、マクロセルとマイクロセル
を適宜切り替える必要がある。2. Description of the Related Art Conventionally, techniques in such a field include:
For example, there is one described in the following literature. Literature 1: "Automobile phone" supervised by Moruji Kuwahara (Showa 60-2-2)
0), Institute of Electronics, Information and Communication Engineers, P.23-25 Literature 2: "A radio propagation of wireless communication", edited by Masaaki Shinji (Hei 4-
2-20) IEICE, P.96-98 Literature 3: Yoshihisa Okumura, Masaaki Shinji “Basics of mobile communication”
(Showa 61-10-1) The Institute of Electronics, Information and Communication Engineers, P.62-64 A mobile communication system that enables anyone to communicate anytime, anywhere, is one of the ultimate forms of communication. It is rapidly spreading, as represented by recent mobile phones and mobile phones. However, with the increase in the spread, there is a concern that the frequency band is insufficient. 2. Description of the Related Art In a mobile phone, a mobile phone, and the like, a macro cellular system in which terminals such as a mobile phone and a mobile phone are accommodated in a macro cell unit is employed. In the macro cellular system, since the service area of one receiving base station that provides a service to a terminal is as large as several kilometers, it is possible to sufficiently switch cells for a moving terminal. On the other hand, in the microcellular system using microcells represented by PHS, the service area of one receiving base station is as small as several hundred meters. Therefore, although the frequency can be effectively used, the success rate of cell switching for a moving terminal is inferior to that of the macro cellular system. Therefore, in order to secure both the frequency utilization efficiency and the cell switching success rate, a hierarchical cell configuration in which a macro cell and a micro cell are superimposed is required, and the macro cell and the micro cell are appropriately changed depending on the moving state of the terminal. Need to switch.
【０００３】上記文献１によれば、電界強度と、送信基
地局（端末）−受信基地局間の距離との関係は、距離が
２０Ｋｍまでは電界強度が距離のログ(Log）スケールに
比例し、距離が２０Ｋｍ以上では距離のリニア(Linear)
スケールに比例することが記載されている。よって、受
信基地局が送信基地局の移動を判別する手段として、あ
る時刻ｔにおける電界強度とある時刻ｔ＋Ｔにおける電
界強度とから、時刻ｔとｔ＋Ｔにおける送信基地局−受
信基地局間の距離ｄ１とｄ２をそれぞれ割り出すことが
可能である。そのため、受信基地局は、送信基地局の速
度Ｖが次の（１）て求められることから、送信基地局の
移動検出をすることができる。 Ｖ＝ abs（ｄ１−ｄ２）／Ｔ ・・・（１） （abs は絶対値演算） また、送信基地局が動いている陸上移動通信において、
受信基地局が送信基地局からの送信信号を受信したとき
の、走行距離に対する受信波は、例えば文献２、及び文
献３に示されている．文献２によれば、受信基地局から
見た送信基地局からの送信信号には、多重波干渉により
搬送波周波数の約半波長周期の定在波が発生し、移動す
る基地局の走行と共に受信レベルはこの定在波の強度に
比例して激しく変動（フェージング）する。そして文献
３より、この変動ピッチの最大周波数ｆD と送信搬送波
の波長λとから、移動速度Ｖは、次の（２）式よって求
められることから、送信基地局の移動検出をすることが
できる。 Ｖ＝ｆD ×λ ・・・（２）According to the above document 1, the relationship between the electric field strength and the distance between the transmitting base station (terminal) and the receiving base station is such that the electric field strength is proportional to the log scale of the distance up to a distance of 20 km. If the distance is 20 km or more, the distance is linear.
It is described that it is proportional to the scale. Therefore, as means for the receiving base station to determine the movement of the transmitting base station, the distance d1 between the transmitting base station and the receiving base station at times t and t + T is calculated based on the electric field strength at a certain time t and the electric field strength at a certain time t + T. It is possible to determine d2 respectively. Therefore, the receiving base station can detect the movement of the transmitting base station because the speed V of the transmitting base station is obtained by the following (1). V = abs (d1-d2) / T (1) (abs is an absolute value calculation) In land mobile communication in which the transmission base station is moving,
When the receiving base station receives a transmission signal from the transmitting base station, the received wave corresponding to the traveling distance is shown in, for example, References 2 and 3. According to Document 2, a standing wave having a half-wave period of a carrier frequency is generated in a transmission signal from a transmission base station as viewed from a reception base station due to multiplex interference, and the reception level is increased with the traveling of the moving base station. Fluctuates drastically (fading) in proportion to the strength of this standing wave. According to Document 3, since the moving speed V is obtained from the maximum frequency f D of the fluctuation pitch and the wavelength λ of the transmission carrier by the following equation (2), the movement of the transmission base station can be detected. . V = f D × λ (2)
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
基地局の移動検出方法では、次のような課題があった。
文献１の方法において、送信基地局が受信基地局を中心
として、円の円周方向に移動したとき等では、該送信基
地局が移動しているにも関わらず電界強度が時間Ｔの間
であまり変化しないという問題点があった。さらに、送
信基地局と受信基地局の距離が遠い場合、あるいは送信
基地局の移動区間が短いときなどにも、電界強度が時間
Ｔの間であまり変化しないという問題点があった。ま
た、文献２、３の方法において、移動速度によって変動
ピッチの最大周波数ｆD は求められるが、推定するデー
タは位相がランダムであるため、リアルタイムに求める
には変動ピッチの最大周波数ｆD を忠実に再現できるく
らいのデータの量（サンプリング周波数は最低搬送波周
波数の数倍から数10倍以上）が必要となり、困難であ
る。本発明は、受信基地局において、送信基地局の送信
信号の強度を測定し、信号強度の高周波成分の一定時間
の変化量を測定し、必要に応じてその変化量の特徴を強
調し、累積し、得られた変化量から送信基地局の移動状
態を判定することにより、送信基地局−受信基地局間の
距離が一定で電界強度が時間Ｔの間であまり変化しない
ときでも、簡単に移動検出を行う移動体通信システムを
実現する。However, the conventional method for detecting the movement of a base station has the following problems.
In the method of Document 1, when the transmitting base station moves in the circumferential direction of the circle around the receiving base station, the electric field intensity is maintained during the time T despite the moving of the transmitting base station. There was a problem that it did not change much. Further, when the distance between the transmitting base station and the receiving base station is long, or when the moving section of the transmitting base station is short, there is a problem that the electric field strength does not change much during the time T. Further, in the methods of Documents 2 and 3, the maximum frequency f D of the variable pitch is obtained depending on the moving speed. However, since the data to be estimated have a random phase, the maximum frequency f D of the variable pitch is faithfully determined in real time. This requires a large amount of data that can be reproduced at a minimum (sampling frequency is several times to several tens times or more of the lowest carrier frequency), which is difficult. The present invention provides a receiving base station that measures the strength of a transmission signal of a transmitting base station, measures the amount of change in the high-frequency component of the signal strength over a certain period of time, emphasizes the characteristics of the amount of change as necessary, and accumulates the characteristics. By determining the moving state of the transmitting base station from the obtained variation, even when the distance between the transmitting base station and the receiving base station is constant and the electric field strength does not change much during the time T, the mobile base station can easily move. A mobile communication system that performs detection is realized.
【０００５】[0005]
【課題を解決するための手段】前記課題を解決するため
に、本発明のうちの第１の発明は、送信信号を放射する
移動可能な送信基地局と、サービスエリア内の前記送信
基地局に対してサービスを提供する第１の受信基地局
と、前記第１の受信基地局よりも狭いサービスエリア内
の前記送信基地局に対してサービスを提供する第２の受
信基地局と、前記第１の受信基地局と第２の受信基地局
を選択し、この選択した第１の受信基地局または第２の
受信基地局を用いて前記送信基地局に対するサービスの
提供を実行させる受信基地局制御手段とを備えた移動体
通信システムにおいて、つぎの処理を行い、前記第１の
受信基地局または第２の受信基地局の選択を行うように
している。即ち、前記第１の受信基地局、前記第２の受
信基地局または前記受信基地局制御手段により、前記送
信基地局からの送信信号を受信して該送信信号の強度を
測定する信号強度測定処理と、前記強度の測定結果中の
高周波成分を抽出し、該高周波成分の一定時間毎の変化
量を測定する変化量測定処理とを行う。そして前記受信
基地局制御手段により、前記変化量に基づき前記送信基
地局の移動状態を判定し、該判定結果を前記第１の受信
基地局または第２の受信基地局を選択する際の選択基準
として出力する判定処理を行う。According to a first aspect of the present invention, there is provided a mobile transmission base station for radiating a transmission signal and a mobile transmission base station in a service area. A first receiving base station for providing service to the first receiving base station, a second receiving base station for providing service to the transmitting base station in a smaller service area than the first receiving base station, Receiving base station control means for selecting a receiving base station and a second receiving base station, and providing service to the transmitting base station using the selected first receiving base station or second receiving base station In the mobile communication system provided with the above, the following processing is performed to select the first receiving base station or the second receiving base station. That is, the first reception base station, the second reception base station, or the reception base station control means receives a transmission signal from the transmission base station and measures the strength of the transmission signal. And a change amount measuring process of extracting a high frequency component in the intensity measurement result and measuring a change amount of the high frequency component at regular intervals. The receiving base station control means determines the moving state of the transmitting base station based on the amount of change, and determines the determination result based on a selection criterion for selecting the first receiving base station or the second receiving base station. Is performed.
【０００６】第２の発明は、第１の発明における前記変
化量測定処理で得られた変化量の特徴を強調する特徴量
強調処理を行い、前記判定処理で、前記特徴を強調した
変化量に基づき、前記送信基地局の移動状態を判定する
ようにしている。送信基地局が動いている陸上移動通信
等において、受信基地局が送信基地局からの送信信号を
受信したときの、走行距離に対する受信波は、例えば文
献２に示されている。文献２によれば、受信基地局から
見た送信基地局からの送信信号には、多重波干渉により
搬送波周波数の約半波長周期の定在波が発生し、移動す
る基地局の走行と共に受信レベルはこの定在波の強度に
比例して激しく変動（フェージング）する。このとき、
変化量の特徴となるものは、送信基地局が移動している
か否かにより生じるフェージングによる影響（搬送波の
中央値を基準とすると+10[dB] から-30[dB] ）と搬送波
に対するノイズとである。搬送波に対するノイズは送信
基地局が移動しているか否かに関わらず存在するもので
あるが、そのノイズレベルはフェージングによる影響に
比べて小さい。そこで、第１及び第２の発明では、送信
基地局から送信信号を受信する第１及び第２の受信基地
局または受信基地局制御手段において、信号強度測定処
理を行う。信号強度測定処理により、送信基地局から放
射する送信信号の強度が測定される。変化量測定処理に
より、信号強度の測定結果中の高周波成分が抽出され、
該高周波成分の一定時間毎の変化量が測定される。この
高周波成分は、主としてフェージングによる影響であ
る。変化量の特定結果を例えばしきい値で判定すること
で、送信基地局が移動しているかいなかが検出される。
従って、前記課題を解決できるのである。According to a second aspect of the present invention, a feature amount emphasizing process for emphasizing a feature of the change amount obtained in the change amount measuring process according to the first aspect is performed, and in the determination process, the change amount emphasizing the feature is reduced. Based on this, the moving state of the transmission base station is determined. In land mobile communication or the like in which a transmitting base station is moving, a received wave corresponding to a traveling distance when a receiving base station receives a transmission signal from the transmitting base station is disclosed in, for example, Reference 2. According to Document 2, a standing wave having a half-wave period of a carrier frequency is generated in a transmission signal from a transmission base station as viewed from a reception base station due to multiplex interference, and the reception level is increased with the traveling of the moving base station. Fluctuates drastically (fading) in proportion to the strength of this standing wave. At this time,
The characteristics of the amount of change are the effects of fading (+10 [dB] to -30 [dB] with respect to the median value of the carrier) caused by whether the transmitting base station is moving or not, and noise for the carrier. It is. The noise on the carrier exists regardless of whether the transmission base station is moving or not, but the noise level is small compared to the effect of fading. Therefore, in the first and second inventions, the first and second receiving base stations or receiving base station control means for receiving a transmission signal from the transmitting base station perform signal strength measurement processing. By the signal strength measurement processing, the strength of the transmission signal radiated from the transmission base station is measured. By the change amount measurement process, high frequency components in the signal strength measurement result are extracted,
The amount of change of the high-frequency component at regular intervals is measured. This high frequency component is mainly caused by fading. The determination result of the amount of change is determined by, for example, a threshold value, thereby detecting whether or not the transmission base station is moving.
Therefore, the above problem can be solved.
【０００７】[0007]
【発明の実施の形態】図２は、本発明の実施形態を示す
移動体通信システムの構成図である。この移動体通信シ
ステムは、サービスエリアの広いマクロセルとサービス
エリアの狭いマイクロセルとを重畳した階層型セル構成
を用い、自動車電話や携帯電話等の移動可能な送信基地
局１に対してサービスを提供し、通話路を設定する。マ
クロセル１０には、第１の受信基地局であるマクロセル
受信基地局１１が配備されている。マイクロセル２０に
は、第２の受信基地局であるマイクロセル受信基地局２
１が配置されている。マクロセル２０がマイクロセル１
０の領域をカバーするようになっている。この通信シス
テムには、さらに、外部との交換機能を有するととも
に、受信基地局１１，２１を選択して送信基地局１に対
するサービスを提供させる機能を有する受信基地局制御
部３０が設けられている。図３は、図２の受信基地局制
御部３０の要部の構成ブロック図である。受信基地局制
御部３０は、アンテナ３１を備えている。アンテナ３１
には、信号強度測定部３２が接続され、該信号強度測定
部３２の出力側には、変化量測定部３３が接続されてい
る。変化量測定部３３の出力側には、特徴量強調部３４
が接続され、該特徴量強調部３４の出力側には、移動状
態判定部３５が接続されている。これら、信号強度測定
部３２〜移動状態判定部３５は、受信基地局１１または
２１を選択しその選択した受信基地局によって送信基地
局１に対するサービスを提供させる受信基地制御手段を
構成するものである。FIG. 2 is a configuration diagram of a mobile communication system showing an embodiment of the present invention. This mobile communication system provides a service to a mobile transmission base station 1 such as a mobile phone or a mobile phone by using a hierarchical cell configuration in which a macro cell having a wide service area and a micro cell having a narrow service area are superimposed. And set the communication path. The macro cell 10 is provided with a macro cell receiving base station 11 which is a first receiving base station. The microcell 20 includes a microcell receiving base station 2 which is a second receiving base station.
1 is arranged. Macro cell 20 is micro cell 1
0 is covered. The communication system further includes a receiving base station control unit 30 having a function of exchanging with the outside and a function of selecting the receiving base stations 11 and 21 and providing a service to the transmitting base station 1. . FIG. 3 is a configuration block diagram of a main part of the reception base station control unit 30 of FIG. The receiving base station control unit 30 includes an antenna 31. Antenna 31
Is connected to a signal strength measuring section 32, and an output side of the signal strength measuring section 32 is connected to a variation measuring section 33. On the output side of the change amount measuring unit 33, a feature amount emphasizing unit 34
Is connected to the output side of the feature amount emphasizing unit 34, and a moving state determining unit 35 is connected to the output side. The signal strength measuring unit 32 to the moving state determining unit 35 constitute a receiving base control unit for selecting the receiving base station 11 or 21 and providing the service to the transmitting base station 1 by the selected receiving base station. .
【０００８】図１は、本発明の実施形態を示す移動体通
信システムにおける基地局の移動検出方法のフローチャ
ートであり、この図１を参照しつつ、図２の移動体通信
システムの動作を説明する。送信基地局１は送信信号を
放射し、その送信信号がアンテナ３１を介して信号強度
測定部３２に与えられる。図１のステップＳ１の信号強
度測定処理において、信号強度測定部３２は、送信信号
における搬送波信号を受信して検波し、検波した信号の
強度を測定する。この信号の強度の瞬時値は、例えば一
定時間Ｔ［ｓ］ごと平均化されて、変化量測定部３３へ
出力される。ステップＳ２の変化量測定処理において、
変化量測定部３３は、信号強度測定部３２で時間Ｔ
［ｓ］毎に測定された信号強度信号Ｒ（ｎ×Ｔ）に対し
て、例えば次の（３）のような差分処理や（４）のハイ
パスフィルタ処理を行って変化量を測定する。ここで、
ｎは受信強度信号のサンプル回数（n=1 〜N ) とする。
ハイパスフィルタ処理によって高周波成分が抽出され
る。 Ｒ（ｔ＋ｎ×Ｔ）−Ｒ（ｔ＋（ｎ−１）×Ｔ） ・・・（３） ΣＲ（ｔ＋（ｎ＋ｍ）×Ｔ）×ｃ（ｔ＋（ｎ＋ｍ）×Ｔ） ・・・（４） 但し、Σの範囲はｍ＝１〜Ｍ、及び係数ｃ（ｔ＋（ｎ＋
ｍ）×Ｔ）はハイパスフィルタとなる値とする。処理し
た値は、特徴量強調部３４に入力される。FIG. 1 is a flowchart of a method for detecting movement of a base station in a mobile communication system according to an embodiment of the present invention. The operation of the mobile communication system of FIG. 2 will be described with reference to FIG. . The transmission base station 1 radiates a transmission signal, and the transmission signal is provided to the signal strength measurement unit 32 via the antenna 31. In the signal strength measurement process in step S1 of FIG. 1, the signal strength measurement unit 32 receives and detects the carrier signal in the transmission signal, and measures the strength of the detected signal. The instantaneous value of the signal intensity is averaged for, for example, a predetermined time T [s] and output to the change amount measurement unit 33. In the change amount measurement process of step S2,
The change amount measuring section 33 uses the time T
The amount of change is measured by performing, for example, the following difference processing (3) or high-pass filter processing (4) on the signal strength signal R (n × T) measured for each [s]. here,
n is the number of samples of the reception intensity signal (n = 1 to N).
High-frequency components are extracted by high-pass filtering. R (t + n × T) −R (t + (n−1) × T) (3) ΣR (t + (n + m) × T) × c (t + (n + m) × T) (4) , Σ ranges from m = 1 to M and the coefficient c (t + (n +
m) × T) is a value that becomes a high-pass filter. The processed value is input to the feature amount emphasizing unit 34.
【０００９】ステップＳ３の特徴量強調処理において、
特徴量強調部３４は、変化量測定部３３で測定した変化
量を、フェージングが主となって起こる変化量とノイズ
が主となって起こる変化量とを区別するために重み付け
を行う。ノイズが主となって起こる変化量はフェージン
グが主となって起こる変化量より小さい。従って、例え
ばノイズが主となって起こる変化量の大きさを１或いは
１以下になるような正規化を行い、その正規化した値を
非線形の特性（正規化した値のα乗を取る）の重み付け
をする。このことにより、フェージングが主となって起
こる変化量が、ノイズが主となって起こる変化量より大
きく強調される。ステップＳ４において、移動状態判定
部３５は、特徴量強調部３４で変化量を強調した値に対
してしきい値制御を行う。ステップＳ５において、しき
い値をβthとしたとき、しきい値を超えた回数ａ＝ａ＋
１と、しきい値制御回数ｂ＝ｂ＋１のカウントを行う。
ここで、移動状態判定部３５は、ステップＳ４を次のよ
うに行ってもよい。即ち、特徴量強調部３４で変化量を
強調した値を累積した値を用いて、しきい値制御を行
う。ただし、特徴量強調部３４で変化量を強調した値を
累積する回数をγとする。しきい値をβthとしたとき、
γ回累積した変化量がしきい値βthを超えた回数ａ＝ａ
＋１と、しきい値制御回数ｂ＝ｂ＋１のカウントを行
う。このことにより、しきい値制御の回数を減らすこと
が可能となるため、制御構成が簡単となる。In the feature amount emphasizing process in step S3,
The feature amount emphasizing unit 34 weights the amount of change measured by the amount of change measuring unit 33 to distinguish the amount of change mainly caused by fading from the amount of change mainly caused by noise. The amount of change mainly caused by noise is smaller than the amount of change mainly caused by fading. Therefore, for example, normalization is performed so that the amount of change mainly caused by noise becomes 1 or less than 1, and the normalized value is set to a non-linear characteristic (taking the normalized value to the power of α). Give weight. As a result, the amount of change mainly caused by fading is emphasized more than the amount of change mainly caused by noise. In step S <b> 4, the moving state determination unit 35 performs threshold value control on the value whose change amount is emphasized by the feature amount emphasis unit 34. In step S5, assuming that the threshold is βth, the number of times the threshold is exceeded a = a +
1 and the number of threshold control times b = b + 1 are counted.
Here, the moving state determination unit 35 may perform step S4 as follows. That is, threshold value control is performed using a value obtained by accumulating values in which the amount of change is emphasized by the feature amount emphasizing unit 34. Here, the number of times of accumulating the value in which the change amount is emphasized by the feature amount emphasizing unit 34 is set to γ. When the threshold is βth,
Number of times that the change amount accumulated γ times exceeds the threshold βth a = a
+1 and the number of threshold control times b = b + 1 are counted. This makes it possible to reduce the number of times of threshold control, thereby simplifying the control configuration.
【００１０】図１のステップＳ５において、しきい値制
御回数がｂ＝ｂthとなったら、しきい値を超えた割合ｃ
＝ａ／ｂを計算する。しきい値を超えた割合ｃがｃ＞ｃ
thならば移動と判定し、ｃ≦ｃthなら停止と判断する。
このとき、送信基地局１がマイクロセル受信基地局２１
と通信していた場合には、ステップＳ５で停止と判断し
たときに、そのままステップＳ１からの処理を継続す
る。移動と判断した場合には、送信基地局１との通信を
マイクロセル受信基地局２１からマクロセル受信基地局
１１へ移す。この際、送信基地局１との通信をマイクロ
セル受信基地局２１からマクロセル受信基地局１１へ移
すトリガ信号を出力する。これと同時に、電界強度の変
化（電界強度−距離特性またはレベル交差回数、フェー
ドデュレーション）、電力スペクトルの広がり幅、送信
タイミングのずれ・伝搬遅延の差など等の移動速度を割
り出せるもので、送信基地局１の移動状態を確認した上
で、通信をマイクロセル受信基地局２１からマクロセル
受信基地局１１へ移してもよい。In step S5 of FIG. 1, if the threshold control count becomes b = bth, the ratio c exceeding the threshold
= A / b is calculated. The ratio c exceeding the threshold is c> c
If it is th, it is determined to be moving, and if c ≦ cth, it is determined to be stopped.
At this time, the transmitting base station 1
If it is determined that the communication is stopped in step S5, the processing from step S1 is continued. If it is determined that the mobile base station has moved, the communication with the transmitting base station 1 is transferred from the micro cell receiving base station 21 to the macro cell receiving base station 11. At this time, a trigger signal for transferring communication with the transmitting base station 1 from the microcell receiving base station 21 to the macrocell receiving base station 11 is output. At the same time, it is possible to determine a moving speed such as a change in electric field strength (electric field strength-distance characteristics or the number of level crossings, fade duration), a spread width of a power spectrum, a shift in transmission timing, a difference in propagation delay, and the like. After confirming the moving state of the station 1, the communication may be transferred from the microcell receiving base station 21 to the macrocell receiving base station 11.
【００１１】送信基地局１が、マクロセル受信基地局１
１と通信していた場合に、ステップＳ５で移動と判断し
たときには、そのままステップＳ１からの処理を継続す
る。停止と判断した場合には、送信基地局１との通信を
マクロセル受信基地局１１からマイクロセル受信基地局
２１へ移す。この際、送信基地局１との通信をマクロセ
ル受信基地局１１からマイクロセル受信基地局２１へ移
すトリガ信号を出力する。これと同時に、電界強度の変
化（電界強度−距離特性またはレベル交差回数、フェー
ドデュレーション）、電力スペクトルの広がり幅、送信
タイミングのずれ・伝搬遅延の差など等の移動速度を割
り出せるもので、送信基地局１の移動状態を確認した上
で、通信をマクロセル受信基地局１１からマイクロセル
受信基地局２１へ移してもよい。以上のように、本実施
形態では、送信基地局１の送信信号の強度を測定し、信
号強度の高周波成分の一定時間毎の変化量を測定、変化
量の特徴を強調し送信局の移動状態を判定するので、送
信基地局１と受信基地局１１，２１との間の距離が同一
で電界強度が時間Ｔの間であまり変化しないときでも、
簡単に移動検出を行うことが可能である。また、送信基
地局１の移動検出データを基に、受信基地局１１，２１
へトリガを与えて選択し、送信基地局１が移動している
ときはマクロセル１０で通信させ、停止しているときは
マイクロセル２０に通信を移すので、マクロセル１０と
マイクロセル２０の有効利用を図ることが可能である。[0011] The transmitting base station 1 is the macro cell receiving base station 1
If it is determined in step S5 that the mobile device 1 has moved, the process from step S1 is continued. If it is determined to stop, the communication with the transmitting base station 1 is transferred from the macro cell receiving base station 11 to the micro cell receiving base station 21. At this time, a trigger signal for transferring communication with the transmitting base station 1 from the macro cell receiving base station 11 to the micro cell receiving base station 21 is output. At the same time, it is possible to determine a moving speed such as a change in electric field strength (electric field strength-distance characteristics or the number of level crossings, fade duration), a spread width of a power spectrum, a shift in transmission timing, a difference in propagation delay, and the like. After confirming the moving state of the station 1, the communication may be transferred from the macro cell receiving base station 11 to the micro cell receiving base station 21. As described above, in the present embodiment, the strength of the transmission signal of the transmission base station 1 is measured, the amount of change in the high-frequency component of the signal strength at regular intervals is measured, and the characteristics of the amount of change are emphasized to determine the moving state of the transmission station. Therefore, even when the distance between the transmitting base station 1 and the receiving base stations 11 and 21 is the same and the electric field strength does not change much during the time T,
It is possible to easily detect movement. Also, based on the movement detection data of the transmitting base station 1, the receiving base stations 11, 21
When the transmitting base station 1 is moving, communication is performed in the macro cell 10 and when the transmitting base station 1 is stopped, communication is transferred to the micro cell 20, so that the macro cell 10 and the micro cell 20 can be effectively used. It is possible to plan.
【００１２】なお、本発明は、上記実施形態に限定され
ず種々の変形が可能である。その変形例としては、例え
ば次のようなものがある。 （ａ） 上記実施形態は、受信基地局制御手段を構成す
る信号強度測定部３２を、受信基地局制御部３０に設け
ているが、これをマクロセル受信基地局１１とマイクロ
セル受信基地局２１の両方に設け、信号強度を測定して
受信基地局制御部３０へ伝送するようにしてもよい。こ
のようにすると、送信基地局１の放射する送信信号を高
速に測定できることから、精度の高い受信ができ、移動
検出がより確実になる。また、受信基地局制御手段を構
成する信号強度測定部３２と変化量測定部３３と特徴量
強調部３４とを、受信基地局制御部３０に設けている
が、信号強度測定部３２と変化量測定部３３、または信
号強度測定部３２と変化量測定部３３と特徴量強調部３
４とをマクロセル受信基地局１１とマイクロセル受信基
地局２１の両方に設け、信号強度を測定して受信基地局
制御部３０へ伝送するようにしてもよい。このようにす
ると、受信基地局制御部３０の処理の負荷が軽減される
ので、移動状態判定部３５の処理数を増やすことが可能
となる。 （ｂ） マクロセル１０とマイクロセル２０の組み合わ
せで説明したが、本発明は、マクロセル１０とピコセ
ル、マイクロセル２０とピコセルなど、サービスエリア
の大きいものと小さいものが組み合わされたセル構成の
場合には、上記実施形態と同様に適用可能である。 （ｃ） 上記実施形態では、送信基地局１に対して通話
路を設定するサービスを想定して説明しているが他のサ
ービスを行う場合も、同様の処理にて行うことにより、
周波数帯域を有効に利用できる。The present invention is not limited to the above embodiment, but can be variously modified. For example, there are the following modifications. (A) In the above embodiment, the signal strength measuring section 32 constituting the receiving base station control means is provided in the receiving base station control section 30. The signal strength measuring section 32 is provided for the macro cell receiving base station 11 and the micro cell receiving base station 21. The signal strength may be measured and transmitted to the reception base station control unit 30. In this way, the transmission signal radiated by the transmission base station 1 can be measured at high speed, so that highly accurate reception can be performed and movement detection can be more reliably performed. Further, the signal strength measuring unit 32, the variation measuring unit 33, and the feature value emphasizing unit 34 constituting the receiving base station control means are provided in the receiving base station control unit 30, but the signal strength measuring unit 32 and the variation Measuring unit 33, or signal intensity measuring unit 32, change amount measuring unit 33, and feature amount emphasizing unit 3
4 may be provided in both the macro cell receiving base station 11 and the micro cell receiving base station 21, and the signal strength may be measured and transmitted to the receiving base station control unit 30. By doing so, the processing load of the receiving base station control unit 30 is reduced, and the number of processes of the moving state determination unit 35 can be increased. (B) Although the description has been given of the combination of the macro cell 10 and the micro cell 20, the present invention is applied to the case of a cell configuration in which the large and small service areas such as the macro cell 10 and the pico cell and the micro cell 20 and the pico cell are combined. , Can be applied similarly to the above embodiment. (C) In the above embodiment, the description has been made assuming a service for setting a communication path for the transmission base station 1. However, when performing other services, the same processing is performed.
The frequency band can be used effectively.
【００１３】[0013]
【発明の効果】以上詳細に説明したように、第１及び第
２の発明によれば、送信基地局の送信信号の強度を測定
し、信号強度の高周波成分の一定時間毎の変化量を測定
し、変化量に基づいて送信局の移動状態を判定するの
で、送信基地局と第１及び第２受信基地局との間の距離
が同一で電界強度がほとんど変化しないときでも、簡単
に移動検出を行うことが可能である。そして、送信基地
局の移動検出データを基に、第１または第２の受信基地
局を選択してサービスを提供させるので、周波数帯域を
有効利用できる。As described above in detail, according to the first and second aspects of the present invention, the strength of the transmission signal of the transmitting base station is measured, and the amount of change in the high-frequency component of the signal strength at regular intervals is measured. Since the moving state of the transmitting station is determined based on the amount of change, even when the distance between the transmitting base station and the first and second receiving base stations is the same and the electric field strength hardly changes, the movement can be easily detected. It is possible to do. Then, based on the movement detection data of the transmitting base station, the first or second receiving base station is selected to provide the service, so that the frequency band can be used effectively.
【図１】本発明の実施形態を示す移動体通信システムに
おける基地局の移動検出方法のフローチャートである。FIG. 1 is a flowchart of a method for detecting movement of a base station in a mobile communication system according to an embodiment of the present invention.
【図２】本発明の実施形態を示す移動体通信システムの
構成図である。FIG. 2 is a configuration diagram of a mobile communication system showing an embodiment of the present invention.
【図３】図２の受信基地局制御部３０の要部の構成ブロ
ック図である。FIG. 3 is a configuration block diagram of a main part of a reception base station control unit 30 of FIG. 2;
１ 送信基地局 １０ マクロセル １１ マクロセル受信基地局 ２０ マイクロセル ２１ マイクロセル受信基地局 ３０ 受信基地局制御部 ３１ アンテナ ３２ 信号強度測定部 ３３ 変化量測定部 ３４ 特徴量強調部 ３５ 移動状態判定部 Ｓ１ 信号強度測定処理 Ｓ２ 変化量測定処理 Ｓ３ 特徴量強調処理 Ｓ４，Ｓ５ 判定処理 Reference Signs List 1 transmitting base station 10 macrocell 11 macrocell receiving base station 20 microcell 21 microcell receiving base station 30 receiving base station control unit 31 antenna 32 signal strength measuring unit 33 change amount measuring unit 34 feature amount emphasizing unit 35 moving state determining unit S1 signal Intensity measurement processing S2 Change amount measurement processing S3 Feature enhancement processing S4, S5 Judgment processing
Claims (2)
局と、 サービスエリア内の前記送信基地局に対してサービスを
提供する第１の受信基地局と、 前記第１の受信基地局よりも狭いサービスエリア内の前
記送信基地局に対してサービスを提供する第２の受信基
地局と、 前記第１の受信基地局と第２の受信基地局を選択し、こ
の選択した第１の受信基地局または第２の受信基地局を
用いて前記送信基地局に対するサービスの提供を実行さ
せる受信基地局制御手段とを備えた移動体通信システム
において、 前記第１の受信基地局、前記第２の受信基地局または前
記受信基地局制御手段により、 前記送信基地局からの送信信号を受信して該送信信号の
強度を測定する信号強度測定処理と、 前記強度の測定結果中の高周波成分を抽出し、該高周波
成分の一定時間毎の変化量を測定する変化量測定処理と
を行い、 前記受信基地局制御手段により、 前記変化量に基づき前記送信基地局の移動状態を判定
し、該判定結果を前記第１の受信基地局または第２の受
信基地局を選択する際の選択基準として出力する判定処
理を行うことを特徴とする移動体通信システムにおける
基地局の移動検出方法。1. A mobile transmission base station that radiates a transmission signal, a first reception base station that provides service to the transmission base station in a service area, Selecting a second receiving base station that provides service to the transmitting base station in a narrow service area, the first receiving base station and a second receiving base station, and selecting the selected first receiving base A mobile communication system comprising: a base station or a second receiving base station, and a receiving base station control means for executing provision of a service to the transmitting base station. The first receiving base station, the second receiving By a base station or the receiving base station control means, a signal strength measurement process of receiving a transmission signal from the transmission base station and measuring the strength of the transmission signal, and extracting a high-frequency component in the strength measurement result, The high frequency And performing a change amount measurement process of measuring a change amount of the component at predetermined time intervals. The receiving base station control means determines a moving state of the transmission base station based on the change amount, and determines the determination result as the first And performing a determination process of outputting as a selection criterion when selecting the receiving base station or the second receiving base station of the base station in the mobile communication system.
特徴を強調する特徴量強調処理を行い、 前記判定処理では、前記特徴を強調した変化量に基づ
き、前記送信基地局の移動状態を判定することを特徴と
する請求項１記載の移動体通信システムにおける基地局
の移動検出方法。2. A feature amount emphasizing process for emphasizing a feature of the change amount obtained in the change amount measuring process, wherein the determination process includes a moving state of the transmission base station based on the change amount emphasizing the feature. 2. The method for detecting movement of a base station in a mobile communication system according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9068435A JPH10271552A (en) | 1997-03-21 | 1997-03-21 | Method for detecting movement of base station in mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9068435A JPH10271552A (en) | 1997-03-21 | 1997-03-21 | Method for detecting movement of base station in mobile communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10271552A true JPH10271552A (en) | 1998-10-09 |
Family
ID=13373634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9068435A Withdrawn JPH10271552A (en) | 1997-03-21 | 1997-03-21 | Method for detecting movement of base station in mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10271552A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009119857A1 (en) * | 2008-03-28 | 2009-10-01 | 京セラ株式会社 | Wireless communication system, mobile station, base station, and wireless communication method |
| WO2014167749A1 (en) * | 2013-04-10 | 2014-10-16 | 三菱電機株式会社 | Reception device, and reception method |
-
1997
- 1997-03-21 JP JP9068435A patent/JPH10271552A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009119857A1 (en) * | 2008-03-28 | 2009-10-01 | 京セラ株式会社 | Wireless communication system, mobile station, base station, and wireless communication method |
| KR101103185B1 (en) | 2008-03-28 | 2012-01-04 | 쿄세라 코포레이션 | Wireless communication system, mobile station, base station, and wireless communication method |
| US8213407B2 (en) | 2008-03-28 | 2012-07-03 | Kyocera Corporation | Wireless communication system, mobile station, base station, and wireless communication method |
| JP5118192B2 (en) * | 2008-03-28 | 2013-01-16 | 京セラ株式会社 | Wireless communication system, mobile station, base station, wireless communication method |
| WO2014167749A1 (en) * | 2013-04-10 | 2014-10-16 | 三菱電機株式会社 | Reception device, and reception method |
| JP5897207B2 (en) * | 2013-04-10 | 2016-03-30 | 三菱電機株式会社 | Receiving apparatus and receiving method |
| US9383437B2 (en) | 2013-04-10 | 2016-07-05 | Mitsubishi Electric Corporation | Reception device and reception method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Kawabata et al. | Estimating velocity using diversity reception | |
| US7483704B2 (en) | Base station and communication method | |
| FI102023B (en) | Method for forming the load target and radio system | |
| KR20000022979A (en) | Method and apparatus for estimating pilot coverages | |
| JPH11505385A (en) | Method for improving reliability of handover and call establishment and cellular radio system | |
| US8145204B2 (en) | Communication terminal out of range determination method, wireless communication system switching method and communication terminal | |
| KR100360178B1 (en) | Radio communication apparatus and radio communication system | |
| US6529496B1 (en) | TSTD transmitter for limiting transmission power of antenna and controlling method thereof for base station in mobile communication system | |
| CN1233379A (en) | Method and receiver for determining terminal velocity | |
| US20090318179A1 (en) | Transmitted power control method and mobile terminal device | |
| Rasheed et al. | Spectrum sensing for cognitive vehicular networks over composite fading | |
| Santucci et al. | A general analysis of signal strength handover algorithms with cochannel interference | |
| JP3360053B2 (en) | Mobile communication terminal | |
| JP2000349704A (en) | Wireless communication device, transmission power control method in wireless communication device, and recording medium | |
| US7398099B2 (en) | System and method for speed indication through transmit power control commands | |
| JPH10271552A (en) | Method for detecting movement of base station in mobile communication system | |
| US6067049A (en) | Reception apparatus | |
| JPH1169418A (en) | Movement detection method for base station | |
| Yan et al. | A study of received signal-level distribution in wideband transmissions in mobile communications | |
| Yang et al. | A wireless LAN measurement method based on RSSI and FER | |
| JPH11252628A (en) | Mobile speed detection method for mobile base station and mobile communication method | |
| Samimi et al. | An approximate analytical framework for performance analysis of equal gain combining technique over independent Nakagami, Rician and Weibull fading channels | |
| McGuffin | Mobile radio power distribution in shadowing and variable range | |
| McGuire et al. | A robust fuzzy logic handoff algorithm | |
| KR0171001B1 (en) | How to maintain a fixed forward cell size |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20040601 |