JPH0774727A - Transmission power control system for spread spectrum communication - Google Patents
Transmission power control system for spread spectrum communicationInfo
- Publication number
- JPH0774727A JPH0774727A JP5220339A JP22033993A JPH0774727A JP H0774727 A JPH0774727 A JP H0774727A JP 5220339 A JP5220339 A JP 5220339A JP 22033993 A JP22033993 A JP 22033993A JP H0774727 A JPH0774727 A JP H0774727A
- Authority
- JP
- Japan
- Prior art keywords
- transmission power
- base station
- mobile station
- power
- transmission
- 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
Landscapes
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、スペクトラム拡散通信
用送信電力制御方式に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission power control system for spread spectrum communication.
【０００２】[0002]
【従来の技術】以下、図面を参照しながら従来のスペク
トラム拡散通信用送信電力制御方式について説明を行
う。図２は従来のスペクトラム拡散通信用送信電力制御
方式のブロック図である。図２において、１は移動局か
らの多重化された基地局における受信信号、２は基地局
受信機、３は通信中の移動局に対する基地局逆拡散部、
４は基地局逆拡散出力電力測定装置、５は送信電力制御
用コマンド発生部、６は基地局拡散部、７は基地局送信
機、８は移動局受信機、９は移動局逆拡散部、１０は送
信電力調整装置、１１は移動局拡散部、１２は移動局送
信機である。2. Description of the Related Art A conventional transmission power control system for spread spectrum communication will be described below with reference to the drawings. FIG. 2 is a block diagram of a conventional transmission power control method for spread spectrum communication. In FIG. 2, 1 is a received signal from a mobile station at a multiplexed base station, 2 is a base station receiver, 3 is a base station despreading unit for a mobile station in communication,
4 is a base station despreading output power measuring device, 5 is a transmission power control command generator, 6 is a base station spreading unit, 7 is a base station transmitter, 8 is a mobile station receiver, 9 is a mobile station despreading unit, Reference numeral 10 is a transmission power adjusting device, 11 is a mobile station spreading unit, and 12 is a mobile station transmitter.
【０００３】このような構成要素からなる従来のスペク
トラム拡散通信用送信電力制御方式について、以下その
動作を説明する。基地局において移動局からの多重化さ
れた受信信号１を基地局受信機２により受信する。そし
てその信号に対して、基地局逆拡散部３において通信中
の一つの移動局に対応した逆拡散を行い、その移動局か
らの信号のみを抽出する。基地局逆拡散出力電力測定装
置４はその電力を測定し、送信電力制御用コマンド発生
部５においてその情報をコマンドとして発生させる。そ
してそのコマンド信号を、通信中の一つの移動局に対応
して基地局拡散部６で拡散し、基地局送信機７によりそ
の移動局へ送信する。The operation of the conventional transmission power control system for spread spectrum communication, which is composed of such components, will be described below. The base station receiver 2 receives the multiplexed reception signal 1 from the mobile station at the base station. Then, the base station despreading unit 3 despreads the signal corresponding to one mobile station in communication, and extracts only the signal from the mobile station. The base station despreading output power measuring device 4 measures the power and causes the transmission power control command generator 5 to generate the information as a command. Then, the command signal is spread by the base station spreading unit 6 corresponding to one mobile station in communication, and is transmitted to the mobile station by the base station transmitter 7.
【０００４】移動局においては、移動局受信機８におい
て基地局からの信号を受信し、その信号に対して移動局
逆拡散部９により逆拡散し、前述のコマンドを抽出す
る。そして送信電力調整装置１０において、そのコマン
ドにある基地局での受信電力が所望する値より小さい場
合は、移動局送信機１１の送信電力を大きくする方向
に、また所望する値より大きい場合は、移動局送信機１
１の送信電力を小さくする方向に送信電力調整装置１０
により移動局送信機１１の送信電力を調整し、移動局か
らの信号の基地局での受信電力が所望された値になるよ
う制御する。In the mobile station, the mobile station receiver 8 receives a signal from the base station, and the mobile station despreader 9 despreads the signal to extract the above-mentioned command. Then, in the transmission power adjusting apparatus 10, when the received power at the base station in the command is smaller than the desired value, the transmission power of the mobile station transmitter 11 is increased, and when the received power is larger than the desired value, Mobile station transmitter 1
Transmission power adjusting apparatus 10 in the direction of decreasing the transmission power of 1
The transmission power of the mobile station transmitter 11 is adjusted to control the reception power of the signal from the mobile station at the base station to a desired value.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記し
た従来のスペクトラム拡散通信用送信電力制御方式で
は、基地局での受信電力測定時から、それにもとづいて
制御された移動局の送信信号が基地局に到達するまでの
間のパス損失の変動により通信品質が劣化するととも
に、一つの基地局と同時に通信する移動局の数が増える
と、その分基地局は拡散部、逆拡散部を増やす必要があ
り、基地局の装置が大規模になるという問題点を有して
いた。However, in the above-mentioned conventional transmission power control method for spread spectrum communication, the transmission signal of the mobile station controlled based on the reception power measurement at the base station is transmitted to the base station. When the number of mobile stations communicating at the same time with one base station increases as the communication quality deteriorates due to fluctuations in the path loss until reaching the base station, the base station needs to increase the spreading unit and despreading unit accordingly. However, there is a problem that the device of the base station becomes large-scale.
【０００６】本発明は上記課題を解決し、従来より簡易
な装置で従来より良好な通信品質をシステムに与えるこ
とができるスペクトラム拡散通信用送信電力制御方式を
提供することを目的としている。An object of the present invention is to solve the above problems and to provide a transmission power control system for spread spectrum communication which can provide a system with better communication quality than before with a device simpler than before.
【０００７】[0007]
【課題を解決するための手段】本発明は上記目的を達成
するために、伝送方式としてＴＤＤ（Time DivisionDup
lex）を用い、移動局における受信時の受信電力を測定
し、それにもとづいて移動局の送信時の所望される送信
電力を、基地局と移動局の間の送信時のパス損失を考慮
に入れて予測することにより、移動局の送信電力制御を
行うようにしたものである。In order to achieve the above object, the present invention uses TDD (Time Division Dup) as a transmission method.
lex) is used to measure the received power at the time of reception at the mobile station, and based on this, the desired transmission power at the time of transmission at the mobile station is taken into consideration by considering the path loss at the time of transmission between the base station and the mobile station. The transmission power of the mobile station is controlled by predicting the transmission power.
【０００８】[0008]
【作用】本発明は上記した構成により、移動局の送信電
力を所望される値に制御するための基地局側における処
理を不要とし、基地局と移動局との間の信号の伝搬遅延
時間中のパス損失の変動を補償することができる。With the above-described structure, the present invention eliminates the need for processing on the base station side for controlling the transmission power of the mobile station to a desired value, and during the propagation delay time of the signal between the base station and the mobile station. The fluctuation of the path loss can be compensated.
【０００９】[0009]
【実施例】以下、本発明の一実施例について、図面を参
照しながら説明を行う。図１は本実施例のスペクトラム
拡散通信用送信電力制御方式のブロック図である。図１
において、８は移動局受信機、９は移動局逆拡散部、１
３は移動局電力測定装置、１４はパス損失予測装置、１
０は送信電力調整装置、１１は移動局拡散部、１２は移
動局送信機、１５はアンテナをＴＤＤのタイミングによ
り送信用または受信用に切り替えるアンテナ切り替え装
置である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a transmission power control method for spread spectrum communication according to this embodiment. Figure 1
, 8 is a mobile station receiver, 9 is a mobile station despreader, 1
3 is a mobile station power measuring device, 14 is a path loss prediction device, 1
Reference numeral 0 is a transmission power adjusting device, 11 is a mobile station spreading unit, 12 is a mobile station transmitter, and 15 is an antenna switching device that switches an antenna for transmission or reception according to the timing of TDD.
【００１０】このような構成要素からなるスペクトラム
拡散通信用送信電力制御方式について、以下その動作を
説明する。アンテナ切り替え装置１５が受信用のとき、
基地局からの信号を移動局受信機８により受信し、移動
局電力測定装置１３においてその受信電力を測定する。The operation of the transmission power control system for spread spectrum communication composed of such components will be described below. When the antenna switching device 15 is for reception,
The mobile station receiver 8 receives a signal from the base station, and the mobile station power measuring device 13 measures the received power.
【００１１】ところで、ＴＤＤのフレーム周期に対して
基地局と移動局の間のパス損失の変動は大変ゆるやかで
あり、直線的である。また伝送方式としてＴＤＤを用い
た場合、送受信が同一周波数を用いたＴＤＤの１フレー
ムにおける上りチャンネルと下りチャンネルのパス損失
はほぼ等しい。By the way, the variation of the path loss between the base station and the mobile station with respect to the TDD frame period is very gentle and linear. When TDD is used as the transmission method, the path loss of the uplink channel and the downlink channel in one frame of TDD using the same frequency for transmission and reception is almost equal.
【００１２】したがって、既知の基地局の送信電力と移
動局電力測定装置１３における基地局からの受信電力の
測定値とから見積もられるパス損失は、その時点におけ
る上りチャンネルのパス損失とほぼ等しいと考えられ
る。そこで数フレームにわたる基地局からの受信電力の
測定値と既知の基地局の送信電力から、ＴＤＤフレーム
の送信時における上りチャンネルのパス損失をパス損失
予測装置１４において予測し、それにもとづいて、その
時点での移動局の送信電力において基地局での受信電力
が所望される値になるように送信電力調整装置１０によ
り移動局送信機１１の送信電力を調整し、送信電力の制
御を行う。Therefore, it is considered that the path loss estimated from the known transmission power of the base station and the measured value of the reception power from the base station in the mobile station power measuring device 13 is almost equal to the path loss of the upstream channel at that time. To be Therefore, the path loss predicting device 14 predicts the path loss of the uplink channel at the time of transmitting the TDD frame from the measured values of the received power from the base station over several frames and the transmission power of the known base station, and based on that, based on that, In the transmission power of the mobile station, the transmission power of the mobile station transmitter 11 is adjusted by the transmission power adjusting device 10 so that the reception power of the base station becomes a desired value, and the transmission power is controlled.
【００１３】[0013]
【発明の効果】以上のように本発明によれば、移動局の
送信電力を所望される値に制御するための基地局側にお
ける処理を不要とし、基地局と移動局との間の信号の伝
搬遅延時間中のパス損失の変動を補償できるので、従来
より簡易な装置で従来より良好な通信品質をシステムに
与えることができる。As described above, according to the present invention, the processing on the base station side for controlling the transmission power of the mobile station to a desired value is unnecessary, and the signal between the base station and the mobile station Since the fluctuation of the path loss during the propagation delay time can be compensated, the communication quality better than the conventional one can be given to the system with a simpler device than the conventional one.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の一実施例におけるスペクトラム拡散通
信用送信電力制御方式の構成を示すブロック図FIG. 1 is a block diagram showing a configuration of a transmission power control system for spread spectrum communication according to an embodiment of the present invention.
【図２】従来のスペクトラム拡散通信用送信電力制御方
式の構成を示すブロック図FIG. 2 is a block diagram showing a configuration of a conventional transmission power control system for spread spectrum communication.
１ 移動局からの多重化された基地局における受信信
号 ２ 基地局受信機 ３ 通信中の移動局に対する基地局逆拡散部 ４ 基地局逆拡散出力電力測定装置 ５ 送信電力制御用コマンド発生部 ６ 基地局拡散部 ７ 基地局送信機 ８ 移動局受信機 ９ 移動局逆拡散部 １０ 送信電力調整装置 １１ 移動局拡散部 １２ 移動局送信機 １３ 移動局電力測定装置 １４ パス損失予測装置 １５ アンテナをＴＤＤのタイミングにより送信用また
は受信用に切り替えるアンテナ切り替え装置1 reception signal at a multiplexed base station from a mobile station 2 base station receiver 3 base station despreading unit for a mobile station in communication 4 base station despreading output power measuring device 5 transmission power control command generation unit 6 base Station spreading unit 7 Base station transmitter 8 Mobile station receiver 9 Mobile station despreading unit 10 Transmission power adjusting device 11 Mobile station spreading unit 12 Mobile station transmitter 13 Mobile station power measuring device 14 Path loss prediction device 15 Antenna of TDD Antenna switching device for switching between transmission and reception depending on timing
Claims (1)
ex）のタイミングにより送信用または受信用に切り替え
るアンテナ切り替え装置と、ＴＤＤの受信時に受信され
た信号の受信電力を測定する受信電力測定装置と、受信
電力の複数の測定値と既知の基地局の送信電力とから、
通信中の基地局と移動局の間の送信時のパス損失を予測
するパス損失予測装置と、所望される基地局での受信電
力と予測されたパス損失から移動局の送信電力を決定し
調整する送信電力調整装置と、それらと接続された送信
機と受信機とを備え、移動局において予測される通信中
の基地局と移動局の間の送信時のパス損失とから、所望
される基地局での受信電力が得られるように移動局の送
信電力を調整し、送信電力制御を行うように構成したス
ペクトラム拡散通信用送信電力制御方式。1. A TDD (Time Division Dupl) antenna is used.
ex) an antenna switching device that switches between transmission and reception depending on the timing, a reception power measurement device that measures reception power of a signal received at the time of receiving a TDD, a plurality of measured values of reception power and a known base station. From the transmission power,
A path loss prediction device that predicts the path loss at the time of transmission between the base station and the mobile station that are in communication, and determines and adjusts the transmission power of the mobile station from the received power at the desired base station and the predicted path loss. A transmission power adjusting device, a transmitter and a receiver connected to the transmission power adjusting device, and from a path loss at the time of transmission between a base station in communication predicted in the mobile station and the mobile station, a desired base A transmission power control method for spread spectrum communication that is configured to adjust the transmission power of a mobile station so that the reception power at the station can be obtained and control the transmission power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5220339A JPH0774727A (en) | 1993-09-06 | 1993-09-06 | Transmission power control system for spread spectrum communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5220339A JPH0774727A (en) | 1993-09-06 | 1993-09-06 | Transmission power control system for spread spectrum communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0774727A true JPH0774727A (en) | 1995-03-17 |
Family
ID=16749603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5220339A Pending JPH0774727A (en) | 1993-09-06 | 1993-09-06 | Transmission power control system for spread spectrum communication |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0774727A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999016189A1 (en) * | 1996-03-22 | 1999-04-01 | Matsushita Electric Industrial Co., Ltd. | Mobile communication equipment |
| KR19990080086A (en) * | 1998-04-13 | 1999-11-05 | 김영환 | Receiving output measuring device using base station transmit power |
| US6097947A (en) * | 1997-04-22 | 2000-08-01 | Nec Corporation | Method for detecting failure mobile station in cellular mobile communication network through transmission power control |
| US6496700B1 (en) | 1996-04-04 | 2002-12-17 | At&T Wireless Services, Inc. | Method for determining organization parameters in a wireless communication system |
| KR100401217B1 (en) * | 1999-03-22 | 2003-10-10 | 인터디지탈 테크날러지 코포레이션 | Outer loop/weighted open loop power control in a time division duplex communication system |
| US8068842B2 (en) | 1999-09-30 | 2011-11-29 | Qualcomm Incorporated | Idle mode handling in a hybrid GSM/CDMA network |
| US8767878B2 (en) | 2000-03-21 | 2014-07-01 | Intel Corporation | Weighted open loop power control transmitter |
| US8842711B2 (en) | 2000-03-22 | 2014-09-23 | Intel Corporation | User equipment for controlling transmission power levels |
-
1993
- 1993-09-06 JP JP5220339A patent/JPH0774727A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999016189A1 (en) * | 1996-03-22 | 1999-04-01 | Matsushita Electric Industrial Co., Ltd. | Mobile communication equipment |
| US6496700B1 (en) | 1996-04-04 | 2002-12-17 | At&T Wireless Services, Inc. | Method for determining organization parameters in a wireless communication system |
| US7043254B2 (en) | 1996-04-04 | 2006-05-09 | Cingular Wireless Ii, Llc | Method for determining organization parameters in a wireless communication system |
| US6097947A (en) * | 1997-04-22 | 2000-08-01 | Nec Corporation | Method for detecting failure mobile station in cellular mobile communication network through transmission power control |
| US6490257B1 (en) | 1997-09-19 | 2002-12-03 | Matsushita Electric Industrial Co., Ltd. | Mobile station apparatus and its transmission power method in wireless communication system |
| KR19990080086A (en) * | 1998-04-13 | 1999-11-05 | 김영환 | Receiving output measuring device using base station transmit power |
| KR100401219B1 (en) * | 1999-03-22 | 2003-10-10 | 인터디지탈 테크날러지 코포레이션 | Weighted open loop power control in a time division duplex communication system |
| KR100401217B1 (en) * | 1999-03-22 | 2003-10-10 | 인터디지탈 테크날러지 코포레이션 | Outer loop/weighted open loop power control in a time division duplex communication system |
| CN101094018A (en) * | 1999-03-22 | 2007-12-26 | 交互数字技术公司 | Combined closed loop/open loop power control in a time division duplex communication system |
| SG157965A1 (en) * | 1999-03-22 | 2010-01-29 | Interdigital Tech Corp | Outer loop/weighted open loop power control in a time division duplex communication system |
| CN101094018B (en) * | 1999-03-22 | 2014-08-13 | 英特尔公司 | Combined closed loop/open loop power control in a time division duplex communication system |
| US8068842B2 (en) | 1999-09-30 | 2011-11-29 | Qualcomm Incorporated | Idle mode handling in a hybrid GSM/CDMA network |
| US8767878B2 (en) | 2000-03-21 | 2014-07-01 | Intel Corporation | Weighted open loop power control transmitter |
| US8842711B2 (en) | 2000-03-22 | 2014-09-23 | Intel Corporation | User equipment for controlling transmission power levels |
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