JPH02192231A - Transmission power control system - Google Patents
Transmission power control systemInfo
- Publication number
- JPH02192231A JPH02192231A JP1011735A JP1173589A JPH02192231A JP H02192231 A JPH02192231 A JP H02192231A JP 1011735 A JP1011735 A JP 1011735A JP 1173589 A JP1173589 A JP 1173589A JP H02192231 A JPH02192231 A JP H02192231A
- Authority
- JP
- Japan
- Prior art keywords
- desired wave
- transmission power
- station
- reception level
- wave
- 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.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 38
- 238000005259 measurement Methods 0.000 claims abstract description 3
- 238000004891 communication Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
この発明は基地局と移動局との間の通信媒体として無線
電波を使用する移動無線通信方式において、効率的に無
線チャネルを使用することを目的とした送信電力の制御
方式に関するものである。[Detailed Description of the Invention] "Industrial Application Field" This invention aims to efficiently use radio channels in a mobile radio communication system that uses radio waves as a communication medium between a base station and a mobile station. This is related to the intended transmission power control method.
「従来の技術」
一般に移動無線通信の分野では、限られた資源である電
波を有効に使用するために、それぞれの基地局の無線ゾ
ーンを可能な限り小さくし、同一の無線チャネルをある
距離以上離れた基地局間で繰り返して使用する方法が用
いられる。現在サービスが行われている自動車電話等に
おいては、この面的なチャンネルの繰り返し利用によっ
て高いチャネル利用率を実現している。"Prior Art" In general, in the field of mobile radio communications, in order to effectively use radio waves, which are a limited resource, the radio zone of each base station is made as small as possible, and the same radio channel is spread over a certain distance. A method is used in which base stations are repeatedly used between distant base stations. In the car phones and the like currently in service, a high channel usage rate is achieved by repeatedly using channels across the area.
この間約チャネル利用率をさらに改善する技術として、
送信電力制御がある。送信電力制御の基本は、必要以上
の電力放射を抑圧し他の無線ゾーンに及ぼす干渉電力を
低減させることである。ある無線ゾーンにおいて、周辺
ゾーンからの干渉波レベルが低下すれば、システム全体
に使用が許可されている無線チャネル数を増やさなくと
も、その無線ゾーンにおける使用可能無線チャネル数が
増加することになり、結果として無線ゾーン当たりの収
容可能移動局数が増大する。従来、このような送信電力
制御を行うために、基地局と移動局の相互で、互いに受
信する相手局の電波のレベルを測定し、その測定したレ
ベルを相互に通知しあうことによって、送信局が相手局
の状態をモニタしていた。この場合、送信局では相手局
の受信レベルが所要の通信品質を満たすレベル以上であ
れば、その所要値に至るまで送信電力を低下させる制御
を実行する。この結果、基地局あるいは移動局で放射す
る電力が低減され、周辺の無線ゾーンに与える干渉電力
量を低下させることが可能になる。During this time, as a technology to further improve the channel utilization rate,
There is transmission power control. The basis of transmission power control is to suppress power emission that is more than necessary and to reduce interference power exerted on other wireless zones. If the level of interference waves from surrounding zones decreases in a certain wireless zone, the number of usable wireless channels in that wireless zone will increase without increasing the number of wireless channels that are permitted to be used in the entire system. As a result, the number of mobile stations that can be accommodated per wireless zone increases. Conventionally, in order to perform such transmission power control, a base station and a mobile station measure the level of the radio waves of the other station that they receive from each other, and notify each other of the measured levels. was monitoring the status of the other station. In this case, if the reception level of the other station is equal to or higher than the level that satisfies the required communication quality, the transmitting station executes control to reduce the transmission power until it reaches the required value. As a result, the power radiated by the base station or mobile station is reduced, making it possible to reduce the amount of interference power imparted to surrounding wireless zones.
「発明が解決しようとする課題」
ところが、この方式の場合、受信局においては送信局の
発する希望波の受信レベルのみを測定し、送信局に通知
している。したがって、受信レベルに応じて送信電力を
制御していった時、同じ無線チャネルを使用している周
辺無線ゾーンからの干渉波が存在すると、希望波の受信
レベルとしては通信品質を満足するレベルてあっても干
渉によって所要の通信品質を維持できない状況が発生し
うる。つまり、第４図に示すように、送信電力制御によ
って所要の通信品質を満たす希望波対干渉波電力比を維
持できない事象が発生する七いう欠点を有していた。第
４図では、Ｂの送信電力制御後の受信レベルにおいて、
破線で示した部分は本来希望波対干渉波電力比を所要の
値に維持するためには必要な電力であり、過剰に制御し
て抑圧した差分を示したものである。従来は、このよう
な事象の発生に対応するため、通信中の無線チャネルの
希望波対干渉波電力比を測定し、この比が所要値を下１
−５た場合には使用中の無線チャネルの再割当を行う等
の制御が必要であった。``Problems to be Solved by the Invention'' However, in this method, the receiving station only measures the reception level of the desired wave emitted by the transmitting station and notifies the transmitting station. Therefore, when controlling the transmission power according to the reception level, if there are interference waves from surrounding wireless zones using the same wireless channel, the reception level of the desired signal may be at a level that satisfies the communication quality. Even if there is, a situation may occur in which the required communication quality cannot be maintained due to interference. In other words, as shown in FIG. 4, there is a drawback that an event occurs in which the power ratio of desired waves to interference waves that satisfies the required communication quality cannot be maintained through transmission power control. In FIG. 4, at the reception level after B's transmission power control,
The portion shown by the broken line is the power originally required to maintain the desired wave to interference wave power ratio at a required value, and represents the difference suppressed by excessive control. Conventionally, in order to deal with the occurrence of such an event, the power ratio of the desired wave to the interference wave of the wireless channel during communication was measured, and this ratio was lowered by 1
-5, it was necessary to take control such as reallocating the wireless channels in use.
この発明の目的は従来技術の欠点である希望波対干渉波
電力比が所要値を下回ることがある点を解決した送信電
力制御方式を提供することである。An object of the present invention is to provide a transmission power control method that solves the drawback of the prior art in that the power ratio of desired waves to interference waves sometimes falls below a required value.
１課題を解決するための手段」
この発明は受信局側で希望波の受信レベルに加え、他局
からの干渉波の受信レベルまたは希望波と干渉波の受信
レベルの相対比の測定を行い、この二つの受信情報を送
信局に通知することによって、干渉波が存在する場合に
は希望波対干渉波電力比が所要値を下回らないように送
信電力を制御することを最も主要な特徴とする。すなわ
ち、従来の技術では、希望波の受信レベルのみに着目し
て通信品質が維持できる受信レベルに至るまで送信電力
を制御していたのに対し、この発明においては希望波の
受信レベルの所要値かまたは希望波対干渉波電力比の所
要値かいずれか先に限界に達するまで送信電力を制御す
るようにした点が異なる。1. Means for Solving Problem 1" This invention measures, in addition to the reception level of the desired wave, the reception level of interference waves from other stations or the relative ratio of the reception levels of the desired wave and interference waves on the receiving station side, The main feature is that by notifying the transmitting station of these two pieces of received information, when interference waves exist, the transmission power is controlled so that the power ratio of desired waves to interference waves does not fall below the required value. . In other words, in the conventional technology, the transmission power was controlled by focusing only on the reception level of the desired wave until it reached the reception level at which communication quality could be maintained, whereas in this invention, the required value of the reception level of the desired wave was controlled. The difference is that the transmission power is controlled until the limit is reached, whichever occurs first, or the required value of the desired wave to interference wave power ratio.
「実施例」
ここでは、基地局と移動局の相互において、受信する希
望波の受信レベルと希望波と干渉波の受信レベル相対比
（以下、希望波対干渉波電力比とする）を測定し、相互
に相手局に通知する場合を例に実施例を説明する。もし
、干渉波の受信レベルの絶対値を通信中に測定可能であ
れば、基地局、移動局の相互で希望波と干渉波の受信レ
ベルの値（絶対値）を通知しあうことで、以下に述べる
方法と同様な送信電力制御が可能になる。"Example" Here, the reception level of the received desired wave and the relative reception level ratio of the desired wave and interference wave (hereinafter referred to as desired wave to interference wave power ratio) are measured between the base station and the mobile station. An embodiment will be described using an example in which the two stations mutually notify the other station. If it is possible to measure the absolute value of the reception level of the interference wave during communication, the base station and mobile station can notify each other of the reception level value (absolute value) of the desired wave and the interference wave, as follows. This enables transmission power control similar to the method described in .
まず、受信局側において通信中に希望波対干渉波電力比
を測定する手段が必要である。この手段としては、たと
えばビート現象を利用した測定手段が適用可能である。First, a means for measuring the desired wave to interference wave power ratio during communication is required on the receiving station side. As this means, for example, a measuring means using a beat phenomenon can be applied.
この手段の簡単な動作原理は以下である。すなわち、同
一チャネルを使用する電波の干渉が発生した場合、受信
される合成波の包絡線が希望波と干渉波のレベル差に応
じた変動量で振動する、いわゆるビートを発生すること
が一触に知られている。前記ビート現象を利用した測定
手段とはこの包路線の変動量を検出することで希望波対
干渉波電力比を測定するものである。The simple operating principle of this means is as follows. In other words, when interference occurs between radio waves using the same channel, the envelope of the received composite wave oscillates with an amount of variation depending on the level difference between the desired wave and the interference wave, which is likely to cause a so-called beat. known to. The measuring means using the beat phenomenon measures the desired wave to interference wave power ratio by detecting the amount of variation in this envelope.
その他、様々な手段が適用可能であるが、いかなる手段
を利用するかは、この発明の効果に本質的に影響を与え
るものではない、以下では簡単のため、前記ビート検出
形の希望波対干渉波電力比の測定を行うものとしてこの
発明の詳細な説明する。Various other means can be applied, but the effect of the present invention is not essentially affected by which means is used. The present invention will be described in detail as a method for measuring wave power ratio.
第１図および第２図はこの発明を実施するための基地局
装置および移動局装置の構成例である。FIG. 1 and FIG. 2 are configuration examples of a base station device and a mobile station device for implementing the present invention.
第１図の基地局装置は、最も簡単な例として送信機と受
信機を一対向で備えた構成を示している。The base station device in FIG. 1 shows, as the simplest example, a configuration in which a transmitter and a receiver are arranged in pairs.
通常の自動車電話基地局等では、無線ゾーンのトラヒツ
クに応じて、複数の送受信機を備えるのが普通であるが
、この発明の実施例としてはなんら変わるところはない
、また、ディジタル変調を用いた場合には、時分割多重
を用いることが可能になり、一対の送受信機で複数のチ
ャネルを扱うことになるが、この場合も後に述べるよう
にこの発明をそのまま適用することが可能である。Ordinary car phone base stations, etc. are usually equipped with multiple transmitters and receivers depending on the traffic in the wireless zone, but there is no difference in the embodiment of this invention. In this case, it becomes possible to use time division multiplexing, and a pair of transceivers handles a plurality of channels. In this case as well, the present invention can be applied as is, as will be described later.
まず、第１図では固定網からの下り回線ｌの信号はイン
ターフェース回路２を経て、更に変調・周波数変換部３
を経て、高周波増幅器４に導かれる。さらに、高周波増
幅器４の出力はアンテナ共用器５を経て、アンテナ６が
ら空間に放射される。First, in FIG. 1, the downlink l signal from the fixed network passes through the interface circuit 2, and then the modulation/frequency conversion section 3.
The signal is then guided to a high frequency amplifier 4. Further, the output of the high frequency amplifier 4 passes through the antenna duplexer 5 and is radiated into space through the antenna 6.
一方、移動局からの上り信号はアンテナ６で受信された
後は、アンテナ共用器５で分離され、受信部７に導かれ
る。受信部７でベースバンド信号に復調された信号はさ
らに、インターフェース回路２を経て、上り回線８を経
由して固定網に送出される。一方、この発明を実施する
ためには、高周波増幅器４の利得を制御する必要があり
、それは制御線９を用いて制御部１０から制御する。ま
た、受信波のレベルはレベル検出器１１により受信部７
から制御部１０へ導かれる。さらに、希望波対干渉波電
力比の情報は受信部７からビート検出器１２を経て制御
部１０へ導かれる。その他、第１図の基地局装置は、制
御部１０に付随する記憶部１３と複数の周波数から任意
の無線チャネルを選択可能とするためのチャネル設定に
必要な周波数シンセサイザ１４を備えた構成とする。た
だし、周波数シンセサイザ１４は、この発明の実施には
本質的には関わりはない。On the other hand, after the uplink signal from the mobile station is received by the antenna 6, it is separated by the antenna duplexer 5 and guided to the receiving section 7. The signal demodulated into a baseband signal by the receiving unit 7 is further transmitted to the fixed network via the interface circuit 2 and uplink 8. On the other hand, in order to implement the present invention, it is necessary to control the gain of the high frequency amplifier 4, and this is controlled from the control section 10 using the control line 9. Further, the level of the received wave is determined by the level detector 11 at the receiving section 7.
from there to the control section 10. Furthermore, information on the desired wave to interference wave power ratio is guided from the receiving section 7 to the control section 10 via the beat detector 12. In addition, the base station device in FIG. 1 is configured to include a storage unit 13 attached to the control unit 10 and a frequency synthesizer 14 necessary for channel setting to enable selection of an arbitrary radio channel from a plurality of frequencies. . However, the frequency synthesizer 14 is not essentially involved in implementing the present invention.
一方の第２図の移動局の構成は、受信器２６、送信器２
７とダイヤルキー２８を備えることの他は基地局装置と
同様の構成となる。すなわち、この発明を実施するにあ
たり基地局と移動局の構成に本質的な機能の違いはない
。On the other hand, the configuration of the mobile station in FIG. 2 includes a receiver 26, a transmitter 2
7 and a dial key 28, the configuration is similar to that of the base station device. That is, when implementing the present invention, there is no essential difference in function between the configurations of a base station and a mobile station.
通常、この発明による送信電力の制御は通信を開始した
後、一定の期間が経過し、受信レベルと希望波対干渉波
電力比の平均的な値が求まった時に起動される。また、
通信中は、常時受信状態を監視し、その状態に変化が生
じた場合には制御を再起動する０通信中に制御信号を基
地局と移動局の相互で送受信することは、たとえば音声
がアナログ変調されている場合でも、音声帯域の外の帯
域を使用して伝送する方式が実用に供されておりなんら
問題はない、もちろん、音声をディジタル変調で伝送す
る場合は、制御情報として送信電力を制御するための伝
送容量を考慮してチャネル設計を行えばよい、すなわち
、制御情報の送受は既存技術で実現あるいは実施されて
おりここでは説明を省略する。Normally, the transmission power control according to the present invention is started when a certain period of time has elapsed after communication has started and the average value of the reception level and the desired wave to interference wave power ratio has been determined. Also,
During communication, the reception status is constantly monitored, and if there is a change in the status, the control is restarted.0 Sending and receiving control signals between the base station and the mobile station during communication is difficult, for example, when audio is analog. Even if the audio is modulated, there is no problem as transmission methods using bands outside the audio band are in practical use.Of course, when audio is transmitted using digital modulation, the transmission power is used as control information. Channel design may be performed taking into account the transmission capacity for control; that is, the transmission and reception of control information is realized or implemented using existing technology and will not be described here.
つぎに、必要な情報の伝達と制御の実行方法であるが、
重要な点は、希望波の受信レベルの所要値かまたは希望
波対干渉波電力比の所要値かいずれか先に限界に達する
まで送信電力を制御することであるから、以下の方法が
考えられる。Next, how to convey the necessary information and carry out control.
The important point is to control the transmission power until either the required value of the desired signal reception level or the required value of the desired signal to interference signal power ratio reaches the limit first, so the following method can be considered. .
■受信局側で、希望波の受信レベルと希望波対干渉波電
力比の測定結果から、可能な送信電力の低減量を求め、
送信側へ通知する。■At the receiving station, calculate the amount of possible reduction in transmission power from the measurement results of the received level of the desired wave and the desired wave to interference wave power ratio,
Notify the sender.
■受信側では、希望波の受信レベルと希望波対干渉波電
力比の双方を送信局へ通知し送信局において、制御すべ
き送信電力量を決定する。(2) On the receiving side, both the received level of the desired wave and the desired wave to interference wave power ratio are notified to the transmitting station, and the transmitting station determines the amount of transmission power to be controlled.
この発明の実施にあたってはいずれの方法を用いてもよ
い、また、原則として、−旦最適制御を行った後に、送
信電力を上げなければならないのは、干渉波がない時に
、希望波レベルが所要値を下回った時とすることが望ま
しい、つまり、通信中に、干渉波が増加し希望波対干渉
波電力比が所要値を下回った場合には、従来の技術で述
べたような無線チャネルの再割当を行うことが望ましい
。Any method may be used to implement this invention, and as a general rule, the reason why it is necessary to increase the transmission power after performing optimal control is to increase the desired signal level when there is no interference wave. In other words, when the interference waves increase during communication and the desired wave to interference wave power ratio falls below the required value, the radio channel It is desirable to perform reallocation.
第３ＴＩ！Ｊにこの発明の結果、最適に制御された状態
の受信レベルの様子を示す、干渉波が存在する場合には
、過剰に送信電力を下げることなく、常に最適な状態が
維持される。3rd TI! As a result of the present invention, when there is an interference wave that indicates the reception level in an optimally controlled state, the optimal state is always maintained without excessively lowering the transmission power.
以上−つの周波数で１回線を保持する無線チャネル構成
を例に実施例を示した。一つの周波数を時分割で使用し
、複数の回線を多重化した場合にも、この発明はそのま
ま適用可能である。この場合、先の例と異なるのは基地
局側の制御である。The embodiment has been described by taking as an example a radio channel configuration in which one line is maintained at three frequencies. The present invention can be applied as is even when one frequency is used in a time-division manner and multiple lines are multiplexed. In this case, the difference from the previous example is the control on the base station side.
基地局側では、複数の移動局からのそれぞれ異なる受信
情報を基に、時分割チャネルスロット毎に最適送信電力
制御を行うことになる。それぞれのスロット毎に考えれ
ば、実現原理はなんら先の例と変わるところはない。The base station side performs optimal transmission power control for each time-division channel slot based on different received information from a plurality of mobile stations. If we consider each slot individually, the implementation principle is no different from the previous example.
「発明の効果」
以上説明したように、この発明では希望波の受信レベル
の所要値かまたは希望波対干渉波電力比の所要値かいず
れか先に限界に達するまで送信電力を制御することによ
って、干渉波が存在する場合には過剰に送信電力を低減
することを防ぎ、常に無線チャネルの使用効率を最大と
するように送信電力の制御が実行されるという利点があ
る。"Effects of the Invention" As explained above, in this invention, the transmission power is controlled until the required value of the reception level of the desired wave or the required value of the power ratio of the desired wave to interference wave, whichever comes first, is reached. This method has the advantage of preventing excessive reduction in transmission power when interference waves exist, and controlling transmission power so as to always maximize radio channel usage efficiency.
第１図はこの発明による基地局の構成図、第２図はこの
発明による移動局の構成図、第３図はこの発明による送
信電力制御を行った場合の受信レベルを示す図、第４図
は従来技術による送信電力制御を行った場合の受信レベ
ルを示す図である。
特許出願人 日本電信電話株式会社FIG. 1 is a block diagram of a base station according to the present invention, FIG. 2 is a block diagram of a mobile station according to the present invention, FIG. 3 is a diagram showing the reception level when transmitting power control is performed according to the present invention, and FIG. FIG. 2 is a diagram showing the reception level when transmitting power control is performed according to the prior art. Patent applicant Nippon Telegraph and Telephone Corporation
Claims (2)
を行う移動無線通信方式において、基地局と移動局の双
方またはいずれか一方の局が、相手局から受信する希望
波と相手局以外から受信する干渉波の受信レベルまたは
その相対比を測定する手段と、前記測定した希望波と干
渉波の受信レベルまたはその相対比を相手局に通知する
手段と、前記測定した希望波と干渉波の受信レベルまた
はその相対比を通知された局が前記通知された相対比ま
たは通知された受信レベルから求めた相対比に基づき送
信電力を制御する手段とを備えたことを特徴とする送信
電力制御方式。(1) In a mobile radio communication system in which communication is performed between a base station and a mobile station using radio waves, both the base station and the mobile station, or either one of them, communicates with the desired wave received from the other station. means for measuring the reception level or relative ratio of interference waves received from sources other than the partner station; means for notifying the partner station of the reception level or the relative ratio thereof of the measured desired wave and interference wave; and the measured desired wave. and means for a station notified of the received level of interference waves or their relative ratio to control transmission power based on the notified relative ratio or the relative ratio determined from the notified received level. Transmission power control method.
、希望波と干渉波の受信レベルまたは希望波の受信レベ
ルと希望波と干渉波の相対比を測定し、その測定結果を
相手局に通知し、相手局では前記通知された希望波の受
信レベルと、通知された相対比または通知された受信レ
ベルから求めた相対比とに基づき送信電力を制御するこ
とを特徴とする送信電力制御方式。(2) Both the base station and the mobile station, or either one of them, measures the reception level of the desired wave and the interference wave, or the reception level of the desired wave and the relative ratio of the desired wave and the interference wave, and transmits the measurement results to the other party. Transmission power is transmitted to the station, and the other station controls the transmission power based on the notified reception level of the desired wave and the notified relative ratio or the relative ratio obtained from the notified reception level. control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1011735A JPH02192231A (en) | 1989-01-19 | 1989-01-19 | Transmission power control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1011735A JPH02192231A (en) | 1989-01-19 | 1989-01-19 | Transmission power control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02192231A true JPH02192231A (en) | 1990-07-30 |
Family
ID=11786292
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1011735A Pending JPH02192231A (en) | 1989-01-19 | 1989-01-19 | Transmission power control system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02192231A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5710981A (en) * | 1995-05-23 | 1998-01-20 | Ericsson Inc. | Portable radio power control device and method using incrementally degraded received signals |
| US5960005A (en) * | 1995-12-25 | 1999-09-28 | Fujitsu Limited | Method and device for two-way communication network |
| JP2007504703A (en) * | 2003-09-02 | 2007-03-01 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Adaptive power control mechanism in WLAN |
| US7577435B2 (en) | 1997-04-24 | 2009-08-18 | Ntt Mobile Communications Network, Inc. | Method and system for mobile communications |
| JP2010087636A (en) * | 2008-09-29 | 2010-04-15 | Kyocera Corp | Mobile communication system, base station apparatus and beat suppression method |
| JP2010087635A (en) * | 2008-09-29 | 2010-04-15 | Kyocera Corp | Mobile communication system, base station apparatus and beat suppression method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60172838A (en) * | 1984-02-15 | 1985-09-06 | Nippon Telegr & Teleph Corp <Ntt> | Mobile communication system |
| JPS6361516A (en) * | 1986-09-01 | 1988-03-17 | Victor Co Of Japan Ltd | Radio communication equipment |
| JPS6412626A (en) * | 1987-07-06 | 1989-01-17 | Nippon Telegraph & Telephone | Mobile communication system |
-
1989
- 1989-01-19 JP JP1011735A patent/JPH02192231A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60172838A (en) * | 1984-02-15 | 1985-09-06 | Nippon Telegr & Teleph Corp <Ntt> | Mobile communication system |
| JPS6361516A (en) * | 1986-09-01 | 1988-03-17 | Victor Co Of Japan Ltd | Radio communication equipment |
| JPS6412626A (en) * | 1987-07-06 | 1989-01-17 | Nippon Telegraph & Telephone | Mobile communication system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5710981A (en) * | 1995-05-23 | 1998-01-20 | Ericsson Inc. | Portable radio power control device and method using incrementally degraded received signals |
| US5960005A (en) * | 1995-12-25 | 1999-09-28 | Fujitsu Limited | Method and device for two-way communication network |
| US7577435B2 (en) | 1997-04-24 | 2009-08-18 | Ntt Mobile Communications Network, Inc. | Method and system for mobile communications |
| US7630716B2 (en) | 1997-04-24 | 2009-12-08 | Ntt Docomo, Inc. | Method and system for mobile communications |
| JP2007504703A (en) * | 2003-09-02 | 2007-03-01 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Adaptive power control mechanism in WLAN |
| JP2010087636A (en) * | 2008-09-29 | 2010-04-15 | Kyocera Corp | Mobile communication system, base station apparatus and beat suppression method |
| JP2010087635A (en) * | 2008-09-29 | 2010-04-15 | Kyocera Corp | Mobile communication system, base station apparatus and beat suppression method |
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