JP3366857B2 - Wireless relay device - Google Patents
Wireless relay deviceInfo
- Publication number
- JP3366857B2 JP3366857B2 JP14828298A JP14828298A JP3366857B2 JP 3366857 B2 JP3366857 B2 JP 3366857B2 JP 14828298 A JP14828298 A JP 14828298A JP 14828298 A JP14828298 A JP 14828298A JP 3366857 B2 JP3366857 B2 JP 3366857B2
- Authority
- JP
- Japan
- Prior art keywords
- base station
- electric field
- downlink
- amplifier
- uplink
- 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 - Fee Related
Links
Landscapes
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、自動車無線などの
移動通信システムにおける不感地対策用無線中継装置に
関するものである。
【０００２】
【従来の技術】自動車電話システムでは、無線を使うた
め、必然的にトンネルや地下街等に電波の届かない不感
地が存在する。そして、この不感地でも自動車電話サー
ビスができるように、現在、無線中継装置の設置が大幅
に増加している。現在までは、無線中継装置の設置数量
が少ないが、今後、増加するにしたがって以下のような
問題が発生する。
【０００３】図３は本発明を適用しようとする無線中継
装置の配置例を示す。図において、１は基地局（Ｂ
Ｓ）、２は基地局１の無線ゾーン、斜線で示した３，３
−１〜３−ｎは不感地、４，４−１〜４−ｎは各不感地
に設置される無線中継装置である。
【０００４】不感地３の中の移動機からの電波を無線中
継装置４で受け、増幅して無線中継装置４のアンテナか
ら基地局１へ送出する。基地局１では、基地局用アンテ
ナで受信し、復調し、信号の送受が行なわれる。
【０００５】例として、無線中継装置４と基地局１が相
互通信するときの無線中継装置４から基地局１への上り
回線の条件について説明する。無線中継装置４のゲイン
（利得）をＧ、雑音指数をＦとし、基地局１の受信信号
レベルをＣ、雑音をＮとし、基地局１と無線中継装置４
間の伝搬損失をＬとする。
【０００６】図４は各信号のレベルの説明図である。図
４（Ａ）は基地局１の受信レベルＣを示す。無線中継装
置４からの上り信号は伝搬損失Ｌだけ低下して基地局１
に受信信号レベルＣで到達する。基地局１での雑音Ｎ
は、次式のように、熱雑音Ｎ0とその他の雑音Ｎx の和
である。
【数１】Ｎ＝Ｎ0 ＋Ｎx
【０００７】基地局１では、受信レベルＣと雑音Ｎの比
（差）ｘ i （ｉは、配置された無線中継器４の数）があ
る値ｘ以上の時、次式で示すように通信が可能であると
する。
【数２】Ｃ−Ｎ＝ｘ i ≧ｘ
【０００８】今、通信が可能となっている時、又その他
の雑音Ｎ xi （ｉは、配置された無線中継器４の数）が無
線中継装置４からの雑音とすると、基地局１での受信信
号レベルＣの中の雑音Ｎは次式で示される。
【数３】Ｎ＝Ｎ0 ＋Ｎx1
但し、Ｎx1は無線中継装置４が１台の時の無線中継装置
４のノイズである。すなわち、通信可能な条件、Ｃ−Ｎ
＝ｘ1 ≧ｘを満足している。
【０００９】図４（Ｂ），（Ｃ）は無線中継装置４が２
台及び複数台（ｍ）のときの受信レベルである。このよ
うに、同一伝搬損失Ｌである無線中継装置が他にある
と、無線中継装置の雑音が基地局に相加される。すなわ
ち、無線中継装置の数が増加していくと、次式のよう
に、基地局の受信雑音（Ｎ）が増加していくことにな
る。
【数４】Ｎ＝Ｎ0 ＋Ｎx1＋Ｎx2＋……＋Ｎxm
【００１０】
【発明が解決しようとする課題】上述のように、無線中
継装置の数が増加しても、Ｃ−Ｎ＝ｘm ≧ｘであれば通
信は可能であるが、無線中継装置４が基地局１に近い所
に設置されると、基地局１は大きな雑音を受信すること
になる。無線中継装置は、伝搬損失Ｌである無線ゾーン
２の周辺部に設置されても使用可能なように考えてい
る。しかし、無線中継装置が基地局１から無線ゾーン２
の半径の１／１０の距離に設置されると、伝搬損失は、
３〜４乗則なので、３０〜４０ｄＢ低減する。
【００１１】すなわち、１台の無線中継装置が無線ゾー
ン２の半径の１／１０の距離の所に設置されるだけで３
０〜４０ｄＢの雑音増加となり、これはゾーン周辺の無
線中継装置の数の１，０００〜１０，０００台に相当す
ることになる。さらに、１／１００の距離であれば、６
０〜８０ｄＢの伝搬損失低下となり、ゾーン周辺の無線
中継装置の数として１，０００，０００台〜１００，０
００，０００台に相当する。
【００１２】このような雑音の増加に打ちかつため、周
辺の無線中継装置の出力を上げる工夫も考えられるが、
周辺で使用する移動機の出力には上限があるので、出力
が弱くて移動機が使用できないという問題があり、無線
ゾーンが実効的に縮まるという欠点がある。
【００１３】従来の問題点を詳細に説明したように、本
発明の目的は、無線中継装置の設置数が多くなったと
き、無線中継装置の設置場所の如何にかかわらず、自動
車電話システムの回線品質や回線レベルに影響を与えな
い無線中継装置を提供することにある。
【００１４】
【課題を解決するための手段】この目的を達成するため
に、本発明の無線中継装置は、移動通信システムにおけ
る不感地に配置され、基地局からの下り回線電波を下り
中継増幅して前記不感地内の移動局に対して放射する下
り増幅系と、該不感地内の移動局からの上り回線電波を
上り中継増幅して前記基地局に対して放射する上り増幅
系とを備えた無線中継装置であって、前記下り増幅系の
前記下り中継増幅器の前段に挿入接続された第１の可変
減衰器と、前記上り増幅系の前記上り中継増幅器の後段
に挿入接続された第２の可変減衰器と、前記下り増幅系
に、前記基地局から継続的又は断続的に送られてくる下
りチャネルの受信電界を測定して該基地局からの伝搬損
失を求める受信電界検出手段と、該受信電界検出手段に
よって求められた前記伝搬損失に応じて前記第１および
第２の可変減衰器の減衰量を設定する制御手段とを備
え、前記受信電界検出手段は、前記基地局から送られて
くる下りチャネル信号を一括して検知し、その最大値よ
り１チャネル当たりの受信電界を測定して前記基地局か
らの伝搬損失を求めるように構成されている。
【００１５】
【発明の実施の形態】図１は本発明の実施例を示すブロ
ック図である。図において、１は基地局（ＢＳ）、５は
移動局（ＭＳ）、１１は基地局向アンテナ、１２は移動
局向アンテナ、１３は基地局向用共用器、１４は移動局
向用共用器、１５は下り信号可変減衰器、１６は上り信
号可変減衰器、１７は下り信号増幅器、１８は上り信号
増幅器、１９は下り信号モニタ器、２０は受信電界検出
器、２１は制御部である。
【００１６】基地局１から送出された下り回線無線電波
は、無線中継装置４の基地局向アンテナ１１で受信し、
共用器１３を通り、可変減衰器１５で信号の減衰を受
け、モニタ器１９で受信したレベルに比例した信号に２
分配され、一方は受信電界検出器２０に入力し、他方は
下り増幅器１９に入力して、微小信号を増幅し、移動局
向共用器１４を通り、アンテナ１２から不感地に放射す
る。
【００１７】不感地の移動機５から送出された上り回線
電波は、アンテナ１２で受信し、共用器１４を通り、増
幅器１８で増幅され、可変減衰器１６で減衰し、基地局
共用器１３を通り、アンテナ１１より基地局１に対して
放射される。
【００１８】下り可変減衰器１５の役目は、増幅器１７
の入力側に接続されているが、基地局１と無線中継装置
の距離が近くなって伝搬損失が減った時、当初予定の伝
搬損失まで増加させるためである。この時、下り増幅器
１７の出力は変わらない。もし、減衰器１５を出力側に
入れると、入力が大となったとき、増幅器１７の歪が増
加するので好ましくない。
【００１９】一方、上り系については増幅器１８の出力
側に可変減衰器１６挿入接続されているが、これは基地
局１との距離が近くなって伝搬損失が低下すれば、その
分出力レベルを減らしてもよいからである。当然、雑音
は低減する。
【００２０】一般に、ブースタ（無線中継装置）を設置
する時、回線設計に応じてブースタのゲイン等を設定す
るが、可変減衰器の設定がわずらわしいこと、又、上り
系の可変減衰器１６の接続位置には関係ないことから問
題もある。例えば、増幅器の入力側に可変減衰器を入れ
ると、出力側に入れた時と比較して、信号レベルは変わ
らないが、雑音が増加する。即ち、次式によって説明さ
れる。
出力レベル＝中継増幅器利得−減衰量
雑音レベル（減衰器をＡＭＰの入力側に入れた時）＝
中継増幅器利得＋増幅器の入力換算熱雑音
雑音レベル（減衰器をＡＭＰの出力側に入れた時）＝
中継増幅器利得−減衰量＋増幅器の入力換算熱雑音
故に、雑音レベル＞雑音レベルとなる。
【００２１】図１に示した本発明の実施例の動作につい
て説明する。モニタ器１９によって受信レベルに比例し
た電界を検出し、受信電界検出器２０で受信レベルを測
定し、制御部２１に測定結果を通知し、基地局１からの
距離を判定し、無線中継装置の利得が最適値になるよう
に制御部２１から可変減衰器１５，１６へ制御信号を送
出する。可変減衰器１５と１６の減衰量は通常は等しく
する。モニタ１９の接続位置は、下り本線上にあればよ
く、受信レベル測定アルゴリズムが変わるだけで本質的
には同じである。
【００２２】入力の電界を測定するには以下の方法によ
る。
（１）第１の方法：通常の自動車電話システムでは、止
り木チャネルといわれる在圏セル検索用等の常時、送信
が継続されている下りチャネルがあるので、そのチャネ
ルの受信電界を専用受信機で測定すれば伝搬損失が判明
する。
【００２３】上記の第１の方法は受信電界測定は正確で
あるが、個別チャネル用（専用）受信機を使用するため
装置の価格が高くなる。そのため、安価な方法として次
の第２の方法を以下に示す。
（２）第２の方法：下りチャネルは、通常、チャネル数
の上限値が決まっている。又、時間的に使用されないチ
ャネルもあるので、一括して検出すれば、その最大値
が、全チャネル受信した時である。従って、ある一定時
間測定して最大値を得たとき、下りチャネル相当分を割
り出せば、１チャネル当たりの受信入力値が測定でき
る。
【００２４】図２は本発明の実施例の一部である上り増
幅系の他の構成例図である。中継増幅装置が高出力用の
場合等、可変減衰器３５を切替方式で行う場合を示す。
図の３４，３６は切替器であり、ｎ個の固定減衰器３５
−１〜３５−ｎを切替える。
【００２５】可変減衰器３２はアナログ又はディジタル
制御のどちらでもよい。この可変減衰器３２の目的は、
出力の雑音レベルを増加させない（入力換算雑音は同
じ）ような位置に実装している。雑音を増加させず、更
に出力歪も抑える可変減衰器の位置と減衰量は、個々の
無線中継装置の性能によって異なるが、通常、この位置
に挿入することにより、１０〜１５ｄＢの可変量が得ら
れる。
【００２６】
【発明の効果】以上、詳細に説明したように、本発明を
実施することにより、無線中継装置を設置する場所がゾ
ーン内のどんな場所であっても最適なゲインを設定し、
かつ、雑音を増加させないため、数多くの無線中継装置
をシステム妨害なしに設置できるという極めて実用的な
効果が得られる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio relay device for a blind spot in a mobile communication system such as a car radio system. 2. Description of the Related Art In a car telephone system, since radio waves are used, there is inevitably a dead zone where radio waves cannot reach a tunnel or an underground shopping mall. At present, the installation of wireless relay devices is increasing significantly so that car telephone services can be provided even in this blind spot. Up to now, the number of wireless relay devices installed is small, but the following problems will occur as the number increases in the future. FIG. 3 shows an arrangement example of a radio relay apparatus to which the present invention is applied. In the figure, 1 is a base station (B
S), 2 is a wireless zone of the base station 1 and 3, 3 shown by oblique lines
Reference numerals 3-1 to 3-n denote blind spots, and reference numerals 4,4-1 to 4-n denote wireless relay devices installed in the blind spots. [0004] Radio waves from a mobile station in the blind spot 3 are received by the radio relay device 4, amplified, and transmitted from the antenna of the radio relay device 4 to the base station 1. In the base station 1, the signal is received by the base station antenna, demodulated, and transmitted and received. [0005] As an example, a description will be given of conditions for an uplink from the radio relay apparatus 4 to the base station 1 when the radio relay apparatus 4 and the base station 1 communicate with each other. The gain (gain) of the wireless relay device 4 is G, the noise figure is F, the received signal level of the base station 1 is C, and the noise is N.
Let L be the propagation loss between them. FIG. 4 is an explanatory diagram of the level of each signal. FIG. 4A shows the reception level C of the base station 1. The uplink signal from the wireless relay device 4 decreases by the propagation loss L and
At the received signal level C. Noise N at base station 1
Is the sum of thermal noise N 0 and other noise N x as in the following equation. In Equation 1] N = N 0 + N x [0007] The base station 1, the ratio (difference) x i of the reception level C and the noise N (i is arranged number of radio repeaters 4) is the value x or At this time, it is assumed that communication is possible as shown by the following equation. [Number 2] C-N = x i ≧ x [0008] Now, when that is the communication is enabled, and other noise N xi (i is the number of positioned radio repeater 4) is the wireless relay device 4, the noise N in the received signal level C at the base station 1 is expressed by the following equation. Equation 3] N = N 0 + N x1 However, N x1 wireless relay device 4 is a noise of the radio relay device 4 when one. That is, the condition for communication, C-N
= X 1 ≧ x. FIGS. 4 (B) and 4 (C) show the case where the
This is the reception level when there are two or more units (m). As described above, when there is another wireless relay device having the same propagation loss L, the noise of the wireless relay device is added to the base station. That is, as the number of wireless relay devices increases, the reception noise (N) of the base station increases as in the following equation. N = N 0 + N x1 + N x2 +... + N xm As described above, even if the number of radio relay devices increases, C−N = x If m ≧ x, communication is possible, but if the wireless relay device 4 is installed near the base station 1, the base station 1 will receive large noise. The wireless relay device is considered to be usable even if it is installed around the wireless zone 2 where the propagation loss is L. However, if the wireless relay device is
When installed at a distance of 1/10 of the radius of
Since it is a 3-4 power rule, it is reduced by 30-40 dB. That is, if only one wireless relay device is installed at a distance of 1/10 of the radius of the wireless zone 2, 3
The noise increases by 0 to 40 dB, which corresponds to 1,000 to 10,000 wireless relay devices around the zone. Furthermore, if the distance is 1/100, 6
The propagation loss is reduced by 0 to 80 dB, and the number of wireless relay devices around the zone is 1,000,000 to 100,0.
Equivalent to 00,000 units. To overcome such an increase in noise, it is conceivable to increase the output of a nearby wireless relay device.
Since there is an upper limit on the output of a mobile device used in the vicinity, there is a problem that the output is weak and the mobile device cannot be used, and there is a drawback that the wireless zone is effectively reduced. As described in detail in the related art, an object of the present invention is to provide a circuit for a mobile telephone system when the number of wireless relay devices increases, regardless of the location of the wireless relay device. An object of the present invention is to provide a wireless relay device that does not affect the quality or the line level. [0014] In order to achieve this object,
A wireless relay device of the present invention is disposed in a blind spot in a mobile communication system, and downstream relay amplifies a downlink radio wave from a base station and radiates it to a mobile station in the blind spot. a wireless relay device including an uplink amplification system uplink radio waves from the mobile station in the shadow area and uplink relay amplification emits to the base station, in front of the downlink relay amplifier of the downlink amplification system a first variable attenuator which is inserted and connected, the second variable attenuator inserted connected to a subsequent stage of the uplink relay amplifier upstream amplification system, before Symbol downstream amplification system, continuously or from the base station A receiving electric field detecting means for measuring a receiving electric field of a downlink channel intermittently transmitted to obtain a propagation loss from the base station; and Second variable attenuator Bei and control means for setting the amount of attenuation
For example, pre-Symbol received field detecting means, the propagation loss from the downlink channel signal transmitted from the base station to collectively detected, the base station measures the received electric field of 1 channel per than its maximum value It is configured to ask. FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 1 is a base station (BS), 5 is a mobile station (MS), 11 is an antenna for a base station, 12 is an antenna for a mobile station, 13 is a duplexer for a base station, and 14 is a duplexer for a mobile station. , 15 is a variable downstream signal attenuator, 16 is a variable upstream signal attenuator, 17 is a downstream signal amplifier, 18 is a upstream signal amplifier, 19 is a downstream signal monitor, 20 is a reception electric field detector, and 21 is a control unit. The downlink radio wave transmitted from the base station 1 is received by the base station antenna 11 of the radio relay device 4,
After passing through the duplexer 13, the signal is attenuated by the variable attenuator 15 and converted into a signal proportional to the level received by the monitor 19.
One is input to the reception electric field detector 20 and the other is input to the down amplifier 19 to amplify a small signal, pass through the duplexer 14 for mobile station, and radiate it from the antenna 12 to a blind spot. The uplink radio wave transmitted from the mobile station 5 in the blind spot is received by the antenna 12, passed through the duplexer 14, amplified by the amplifier 18, attenuated by the variable attenuator 16, and transmitted to the base station duplexer 13. As a result, it is radiated from the antenna 11 to the base station 1. The function of the downstream variable attenuator 15 is the function of the amplifier 17.
The reason for this is that when the distance between the base station 1 and the wireless relay device is short and the propagation loss is reduced, the propagation loss is initially increased. At this time, the output of the downstream amplifier 17 does not change. If the attenuator 15 is put on the output side, when the input becomes large, the distortion of the amplifier 17 increases, which is not preferable. On the other hand, in the upstream system, the variable attenuator 16 is inserted and connected to the output side of the amplifier 18. If the distance from the base station 1 is short and the propagation loss is reduced, the output level is reduced accordingly. This is because it may be reduced. Of course, noise is reduced. Generally, when a booster (wireless repeater) is installed, the gain and the like of the booster are set in accordance with the line design. However, the setting of the variable attenuator is troublesome, and the connection of the upstream variable attenuator 16 is required. There is a problem because it is not related to the position. For example, when a variable attenuator is provided on the input side of the amplifier, the signal level does not change but noise increases as compared with when the variable attenuator is provided on the output side. That is, it is described by the following equation. Output level = relay amplifier gain−attenuation noise level (when the attenuator is put on the input side of AMP) =
Relay amplifier gain + thermal noise level converted to input of amplifier (when attenuator is placed on output side of AMP) =
The noise level> noise level because of the gain of the relay amplifier−attenuation + the thermal noise converted to the input of the amplifier. The operation of the embodiment of the present invention shown in FIG. 1 will be described. The electric field proportional to the reception level is detected by the monitor 19, the reception level is measured by the reception electric field detector 20, the measurement result is notified to the control unit 21, the distance from the base station 1 is determined, The control unit 21 sends a control signal to the variable attenuators 15 and 16 so that the gain becomes an optimum value. The attenuations of the variable attenuators 15 and 16 are usually equal. The connection position of the monitor 19 only needs to be on the downstream main line, and is essentially the same except that the reception level measurement algorithm is changed. The following method is used to measure the input electric field. (1) First method: In a normal car telephone system, there is a downlink channel, which is called a perch channel, which is always used for searching for a serving cell, and is continuously transmitted. The measurement will determine the propagation loss. Although the first method described above is accurate in measuring the received electric field, the use of a dedicated channel (dedicated) receiver increases the cost of the apparatus. Therefore, the following second method is shown below as an inexpensive method. (2) Second method: For downlink channels, the upper limit of the number of channels is usually determined. Also, some channels are not used temporally, so if they are detected collectively, the maximum value is when all channels are received. Therefore, when the maximum value is obtained during a certain period of time and the maximum value is obtained, the reception input value per channel can be measured by calculating the amount corresponding to the downlink channel. FIG. 2 is a diagram showing another configuration example of the upstream amplification system which is a part of the embodiment of the present invention. A case where the variable attenuator 35 is performed by a switching method, such as a case where the relay amplifying device is for high output, is shown.
In the figure, reference numerals 34 and 36 denote switching devices, and n fixed attenuators 35 are provided.
-1 to 35-n are switched. Variable attenuator 32 may be either analog or digitally controlled. The purpose of this variable attenuator 32 is
It is mounted at a position where the noise level of the output is not increased (the input conversion noise is the same). The position and attenuation of the variable attenuator, which does not increase noise and further suppresses output distortion, differ depending on the performance of each wireless relay device, but usually, by inserting at this position, a variable amount of 10 to 15 dB can be obtained. Can be As described in detail above, by implementing the present invention, the optimum gain can be set regardless of where the wireless relay device is installed in the zone.
In addition, since the noise is not increased, an extremely practical effect that many wireless relay devices can be installed without system interference is obtained.
【図面の簡単な説明】
【図１】本発明の実施例を示すブロック図である。
【図２】本発明の実施例の一部を示すブロック図であ
る。
【図３】本発明を適用しようとするシステム配置図であ
る。
【図４】各信号のレベル説明図である。
【符号の説明】
１ 基地局
２ 無線ゾーン
３，３−１〜３−ｎ 不感地
４，４−１〜４−ｎ 無線中継装置
５ 移動機
１１，１２ アンテナ
１３，１４ 共用器
１５，１６，３２，３５ 可変減衰器
１７，１８ 増幅器
１９ 下り信号モニタ器
２０ 受信電界検出器
２１ 制御部
３１，３３ 増幅器
３５−１，３５−ｎ 固定減衰器
３４，３６ 切替器BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 is a block diagram showing a part of the embodiment of the present invention. FIG. 3 is a system layout diagram to which the present invention is applied. FIG. 4 is an explanatory diagram of the level of each signal. [Description of Signs] 1 Base station 2 Wireless zone 3, 3-1 to 3-n Dead area 4, 4-1 to 4-n Wireless relay device 5 Mobile device 11, 12 Antenna 13, 14 Duplexer 15, 16, 32, 35 Variable attenuator 17, 18 Amplifier 19 Downstream signal monitor 20 Received electric field detector 21 Control unit 31, 33 Amplifier 35-1, 35-n Fixed attenuator 34, 36 Switch
フロントページの続き (72)発明者 加賀屋 範行 東京都中野区東中野三丁目14番20号 国 際電気株式会社内 (72)発明者 内田 貴 東京都中野区東中野三丁目14番20号 国 際電気株式会社内 (72)発明者 藤沢 和弘 東京都中野区東中野三丁目14番20号 国 際電気株式会社内 (72)発明者 伊藤 和人 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 (72)発明者 福家 裕 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５−129984（ＪＰ，Ａ) 特開 平５−235819（ＪＰ，Ａ) 特開 平９−148865（ＪＰ，Ａ) 特開 平10−22895（ＪＰ，Ａ) 特開 昭63−306727（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H04B 7/14 - 7/22 H04B 7/24 - 7/26 H04Q 7/00 - 7/38 Continued on the front page (72) Inventor Noriyuki Kagaya 3-14-20 Higashinakano, Nakano-ku, Tokyo International Electric Company, Ltd. (72) Inventor Takashi Uchida 3-14-20 Higashinakano, Nakano-ku, Tokyo International Electric Stock In-company (72) Inventor Kazuhiro Fujisawa 3--14-20 Higashi-Nakano, Nakano-ku, Tokyo International Electric Co., Ltd. (72) Inventor Kazuto Ito 2-1-1 Toranomon, Minato-ku, Tokyo (72) Inventor Hiroshi Fukuya 2-10-1, Toranomon, Minato-ku, Tokyo NTT Mobile Communication Network Co., Ltd. (56) References JP-A-5-129984 (JP) JP-A-5-235819 (JP, A) JP-A-9-148865 (JP, A) JP-A-10-22895 (JP, A) JP-A-63-306727 (JP, A) (58) Field surveyed (Int.Cl. 7 , DB name) H04B 7/ 14-7/22 H04B 7/ 24-7/26 H04Q 7 /00-7/38
Claims (1)
され、基地局からの下り回線電波を下り中継増幅して前
記不感地内の移動局に対して放射する下り増幅系と、該
不感地内の移動局からの上り回線電波を上り中継増幅し
て前記基地局に対して放射する上り増幅系とを備えた無
線中継装置において、 前記下り増幅系の前記下り中継増幅器の前段に挿入接続
された第１の可変減衰器と、前記上り増幅系の前記上り
中継増幅器の後段に挿入接続された第２の可変減衰器
と、前記下り増幅系に前記基地局から継続的又は断続的
に送られてくる下りチャネルの受信電界を測定して該基
地局からの伝搬損失を求める受信電界検出手段と、該受
信電界検出手段によって求められた前記伝搬損失に応じ
て前記第１および第２の可変減衰器の減衰量を設定する
制御手段とを備え、 前記受信電界検出手段は前記基地局から送られてくる下
りチャネル信号を一括して検知し、その最大値より１チ
ャネル当たりの受信電界を測定して前記基地局からの伝
搬損失を求めるように構成されたことを特徴とする無線
中継装置。 (57) [Claim 1] A downlink amplifier which is arranged in a blind spot in a mobile communication system and relays and amplifies a downlink radio wave from a base station and radiates it to a mobile station in the blind spot. And a radio relay apparatus comprising an uplink amplification system that uplink-amplifies and radiates an uplink radio wave from a mobile station in the blind area and radiates it to the base station, wherein the downlink amplification amplifier of the downlink amplification system includes: A first variable attenuator inserted and connected at the front stage, a second variable attenuator inserted and connected at the rear stage of the uplink relay amplifier of the upstream amplification system, and a continuous or Intermittent
The received electric field of the downlink channel sent to the
Receiving electric field detecting means for obtaining a propagation loss from a base station;
According to the propagation loss determined by the transmission electric field detection means.
To set the attenuation of the first and second variable attenuators
Control means, and the reception electric field detection means includes a
Channel signals are detected at once, and one channel is detected from the maximum value.
The received electric field per channel is measured and transmitted from the base station.
Radio characterized in that it is configured to determine the transport loss
Relay device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14828298A JP3366857B2 (en) | 1998-05-14 | 1998-05-14 | Wireless relay device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14828298A JP3366857B2 (en) | 1998-05-14 | 1998-05-14 | Wireless relay device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11331054A JPH11331054A (en) | 1999-11-30 |
| JP3366857B2 true JP3366857B2 (en) | 2003-01-14 |
Family
ID=15449288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14828298A Expired - Fee Related JP3366857B2 (en) | 1998-05-14 | 1998-05-14 | Wireless relay device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3366857B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010110880A (en) * | 2000-06-09 | 2001-12-15 | 배준진 | Shut-down method using general radio frequency repeater by inside attenuator |
| KR100416338B1 (en) * | 2001-05-23 | 2004-01-31 | (주)맥서스테크놀로지스 | Device for monitoring a repeater by measurement of field strength |
| US7355993B2 (en) | 2002-06-27 | 2008-04-08 | Adkins Keith L | Method and apparatus for forward link gain control in a power controlled repeater |
| KR20040041209A (en) * | 2002-11-08 | 2004-05-17 | 에스케이 텔레콤주식회사 | Repeater using reductor for mobile communication system |
| DE10342190A1 (en) * | 2003-09-12 | 2005-04-07 | Vodafone Holding Gmbh | Method and system for exploiting cooperative diversity in wireless relay circuits |
| KR100736757B1 (en) | 2006-06-22 | 2007-07-09 | 주식회사알에프윈도우 | Transmission / reception over-input blocking device in mobile communication relay device and method |
| JP4938713B2 (en) * | 2008-03-31 | 2012-05-23 | 日本放送協会 | One-seg signal radiation device |
-
1998
- 1998-05-14 JP JP14828298A patent/JP3366857B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11331054A (en) | 1999-11-30 |
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