WO2000031900A1 - Station base et procede ce commande de puissance d'emission - Google Patents
Station base et procede ce commande de puissance d'emission Download PDFInfo
- Publication number
- WO2000031900A1 WO2000031900A1 PCT/JP1999/006501 JP9906501W WO0031900A1 WO 2000031900 A1 WO2000031900 A1 WO 2000031900A1 JP 9906501 W JP9906501 W JP 9906501W WO 0031900 A1 WO0031900 A1 WO 0031900A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transmission power
- base station
- power control
- target quality
- information
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
- H04W52/283—Power depending on the position of the mobile
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/06—TPC algorithms
- H04W52/12—Outer and inner loops
Definitions
- the present invention relates to a base station device having a function of detecting a position of a terminal device in communication and a transmission power control method.
- a method for detecting the position of a communicating terminal device in a base station in a CDMA wireless communication system is disclosed in ⁇ Requirements and Objectives for 3G Mobile Services and System (ARIB) 1998.7.2U, etc. .
- FIG. 1 is a diagram illustrating a wireless communication system including a base station device having a position detection function.
- the base station apparatus 1 detects the position of the terminal apparatus 2 which is performing wireless communication, first, the direction angle of the terminal apparatus 2 with respect to the own station from the arrival direction of the received signal is determined by using the characteristics of the array antenna. Is detected.
- the method of detecting the direction of the terminal device is disclosed in "Introduction to Adaptive Signal Processing Technology Using Array Antenna and High-Resolution Arrival Wave Estimation Course".
- the base station device 1 After detecting the direction angle 0 of the terminal device 2 with respect to the own station, the base station device 1 measures the distance of the terminal device 2 with respect to the own station.
- a method of measuring the distance L between the base station apparatus 1 and the terminal apparatus 2 will be described with reference to FIG. It takes time only for propagation delay until the downlink signal transmitted from the base station apparatus 1 reaches the terminal apparatus 2. Similarly, it takes time for the uplink signal transmitted from the terminal device 2 to reach the base station device 1 due to propagation delay. Also, it takes a device delay ⁇ 5 from the completion of reception of the downlink signal by the terminal device 2 to the start of transmission of the uplink signal. The device delay ⁇ is determined by the processing delay of each unit, timing jitter, etc. What happens.
- the terminal apparatus 2 starts transmitting a downlink signal to the terminal apparatus 2 and then transmits the downlink signal.
- the propagation delay ⁇ can be calculated from the following equation (1).
- the base station apparatus 1 can calculate the distance L between the own station and the terminal apparatus 2 by the following equation (2).
- a multipath environment there are delayed waves that arrive after being reflected on mountains or buildings, etc., in addition to the direct waves that arrive directly from the transmitting side to the receiving side.
- RAKE combining is performed to combine received signals of a direct wave and a delayed wave having different arrival times.
- transmission power control is performed based on the power value of a received signal in order to reduce interference with other stations while maintaining desired reception quality.
- a handover process for shifting to communication with an adjacent base station device is performed.
- the handover processes there is a diversity handover process for simultaneously communicating with a plurality of base station apparatuses (base station apparatus A and base station apparatus B).
- the radio network controller performs a process of combining the received signals of the plurality of base station devices and sending the signals to the exchange.
- transmission power control is performed so that one of the base station apparatuses satisfies the reception quality. Therefore, if the reception quality of any of the base station devices is good, the base station device transmits a command to lower the transmission power to the terminal device in order to reduce interference in the system, and the terminal device transmits the command.
- the base station device A transmits power to the terminal device. Even if a command to increase the power is transmitted, when the base station B transmits a command to lower the transmission power to the terminal, the terminal lowers the transmission power.
- the terminal device lowers the transmission power according to the instruction of the base station device B while the base station device A performs the above-described position detection, the reception power at the base station device A decreases. Therefore, the position detection performance is degraded.
- An object of the present invention is to provide a base station apparatus and a transmission power control method that can accurately detect the position of a terminal apparatus even during diversity handover.
- the purpose of this is to set the same target quality for all base stations to be subjected to diversity handover in transmission power control at the time of position detection during diversity handover, and to set the base station during diversity handover to the base station during diversity handover. This is achieved by reducing the quality degradation and fluctuation of the received signal due to transmission power control from the station device.
- FIG. 1 is an explanatory diagram for explaining position detection of a terminal device
- FIG. 2 is a slot diagram for explaining the position detection of the terminal device
- FIG. 3 is a diagram showing a system configuration of a base station device, a mobile station device, and a wireless network controller according to an embodiment of the present invention.
- FIG. 4 is a block diagram showing a configuration of a base station apparatus according to an embodiment of the present invention.
- FIG. 5 is a professional diagram showing a configuration of a mobile station apparatus communicating with the base station apparatus shown in FIG. Diagram, and
- FIG. 6 is a diagram showing the relationship between the power of the preceding wave and the delayed wave and time.
- FIG. 3 shows a base station apparatus (Base Station), a mobile station apparatus (Mobile Station) which is a communication terminal apparatus, and a radio network controller (Radio Network Controller) for controlling the base station apparatus according to the embodiment of the present invention.
- FIG. 2 is a block diagram showing the configuration of FIG.
- the mobile station device 103 is in a diversity handover state in which it simultaneously communicates with the base station device a 101 and the base station device b 102.
- a case is considered in which position detection is performed for mobile station device 103 from base station device a 101.
- the base station device a 101 and the base station device b 102 notify the radio network controller 104 that the mobile station device 103 has entered the diversified handover state.
- the wireless network controller 104 sends data to be transmitted to the mobile station device 103 to the base station device a 101 and the base station device b 102.
- the base station device a 101 spreads the data to the mobile station device 103 with the spreading code A and transmits it.
- the base station device b 102 transmits the data to the mobile station device 103 with the spreading code B.
- the signal from base station apparatus a 101 is despread with spreading code A
- the signal from base station apparatus b 102 is despread with spreading code B.
- the mobile station device 103 spreads the data with the spreading code C and transmits the data.
- the received signal is despread with the spreading code C and sent to the wireless network controller 104.
- the base station apparatus b 102 also despreads the received signal with the spreading code C and sends it to the wireless network controller 104.
- Wireless network The controller 104 combines or selects signals from both base station devices and sends them to the network.
- base station apparatus a 101 and base station apparatus b 102 independently control reception quality so as not to be excessively improved. That is, the mobile station apparatus 103 controls to increase the transmission power only when the transmission power control commands from the base station apparatus a 101 and the base station apparatus b 102 are both “increase”. In such a case, when any one of the base station apparatuses instructs to lower the power, the mobile station apparatus 103 lowers the transmission power. Therefore, if the position of the mobile station device 103 is detected by the base station device a 101, the position detection performance becomes unstable.
- the base station device a 101 and the base station device b 102 notify the wireless network controller 104 that the mobile station device 103 is in a diversity handover state.
- the wireless network controller changes the target quality (eg, level) of the transmission power control so that it is sufficient for position detection, and transmits the information to the base station apparatus a 101 and the base station apparatus b 102. Notify that.
- FIG. 4 is a block diagram showing a configuration of the base station apparatus according to the embodiment of the present invention.
- FIG. 5 is a block diagram showing a configuration of a mobile station device that communicates with the base station device shown in FIG.
- a CD MA Code Division Multiple Access
- the reception RF units 215 to 217 amplify the signals received by the antennas 221 to 214, respectively, convert the signals to an intermediate frequency or baseband frequency, perform quadrature detection, Output to Matched Fill 218 to 220.
- the matched filters 218 to 220 perform despreading by multiplying the output signals of the reception RF units 215 to 217 by a unique spreading code, and the delay profile measurement circuit 230 and the selection are performed. Output to circuits 2 27 to 2 29.
- the delay profile measurement circuit 230 measures the delay profile (received power at a predetermined time) of the matched filter 218 to 220 and outputs the measurement result to the timing detection circuit 222.
- FIG. 6 is a diagram illustrating an example of a measurement result of the delay profile.
- the horizontal axis is time
- the vertical axis is power.
- FIG. 6 shows that a direct wave signal of power ⁇ arrives at time t0 and a delayed wave signal of power P1 arrives at time t1.
- the timing detection circuit 222 detects the time at which the signal arrived from the delay profile, and selects the arrival time information of the fastest reception path among the detected times to the selection circuits 222 to 229 and the position detection circuit 222. Output.
- the selection circuits 227 to 229 respectively output the output signals of the matched filters 218 to 220 at the arrival time of the fastest signal based on the information output from the timing detection circuit 222. Output to the estimation circuit 2 2 1.
- the direction-of-arrival estimation circuit 221 estimates the direction of arrival of the received signal from the output signals of the selection circuits 227 to 229, detects the direction angle of the mobile station apparatus with respect to the own station, and calculates the direction angle of the detected direction angle. The information is output to the position detection circuit 222.
- the position detection circuit 224 measures the propagation delay from the information on the arrival time of the fastest signal and the timing offset information, and calculates the distance between the own station and the mobile station apparatus. Then, position detection circuit 222 outputs terminal position information indicating the distance and direction angle between the own station and the mobile station apparatus to a central control station (not shown).
- Antenna duplexer 202 is for using the same antenna for transmission and reception, outputs the signal received by antenna 201 to reception RF section 203, and transmits RF section 210.
- the transmission signal output from 1 is sent to antenna 201.
- the reception RF section 203 amplifies the reception signal input from the antenna duplexer 202, converts the frequency to an intermediate frequency or a baseband frequency, and outputs it to the matched filter 204.
- the matched filter 204 performs despreading by multiplying the output signal of the reception RF section 203 by a unique spreading code, and outputs the result to the delay profile measurement circuit 225 and the selection circuit 226.
- the delay profile measurement circuit 225 measures the delay profile of the output signal of the matched filter 204 and outputs the measurement result to the timing detection circuit 231.
- the timing detection circuit 231 detects the time at which the signal exists from the delay profile, and outputs information of the detected time to the selection circuit 226.
- the selection circuit 222 outputs the output signal of the matched filter 204 to the channel estimation circuits 205 and 206. Specifically, the leading wave is sent to the channel estimation circuit 205, and the delayed wave is sent to the channel estimation circuit 206.
- the channel estimation circuits 205 and 206 estimate phase and amplitude fluctuations due to fading of the received signal. Then, in the RAKE combining circuit 207, the time of the leading wave and the time of the delayed wave are adjusted, and for the leading wave, fluctuations in the phase and amplitude of the fading estimated by the channel estimation circuit 205 are compensated for. Is the phase estimated by the channel estimation circuit 206. To compensate for fluctuations in the phase and amplitude of the signal.
- RAKE combining circuit 207 RAKE combines the corrected signals to perform demodulation, outputs the data portion to a central control station (not shown), and outputs a power control command to transmission RF section 211.
- the RAKE combining circuit 207 performs the RAKE combining by adding the reception data compensated as described above to obtain a received signal.
- the channel estimation values from the channel estimation circuits 205 and 206 are also output to the transmission power control circuit 208.
- the multiplexing circuit 209 multiplexes the transmission power control command calculated by the transmission power control circuit 208 and the transmission signal.
- the modulation circuit 210 performs primary modulation and spread modulation such as QPSK modulation on the result.
- the transmission RF section 211 performs quadrature modulation, frequency conversion, amplification processing, and the like. The power is controlled for amplification based on the received transmission power control command. This radio signal is transmitted from antenna 201 through antenna duplexer 202.
- Antenna duplexer 302 is for using the same antenna for transmission and reception, outputs the signal received by antenna 301 to reception RF sections 303a and 303b, and outputs the signal received from transmission RF section 313.
- the transmission signal is sent to the antenna 301.
- Reception RF sections 303a and 303b amplify the reception signal input from antenna duplexer 302, convert the frequency to an intermediate frequency or baseband frequency, and output them to matched filters 304a and 304b, respectively.
- the matched filters 304a and 304b despread by multiplying the output signals of the reception RF sections 303a and 303b by a unique spreading code, respectively, and provide a delay profile measurement circuit 307 and selection circuits 305a and 305b.
- the delay profile measurement circuit 307 measures the delay profile of the output signals of the matched filters 304a and 304b, and compares the measurement result with the timing detection circuit 30. Output to 8.
- the timing detection circuit 308 detects the time at which the signal exists from the delay profile, and outputs information of the detected time to the selection circuits 305a and 305b, respectively.
- the selection circuits 305a and 305b output the output signals of the matched filters 304a and 304b, respectively, to the channel estimation circuits 306a and 306b. Specifically, the leading wave is sent to the channel estimation circuit 303a, and the delayed wave is sent to the channel estimation circuit 310.
- the channel estimating circuits 300a and 360b estimate the phase and amplitude fluctuations due to fading of the received signal, respectively.
- the RAKE combining circuit 309 the time of the leading wave and the time of the delayed wave are adjusted, and for the leading wave, fluctuations in the phase and amplitude of the fading estimated by the channel estimation circuit 306a are compensated for, and For the extension, the fluctuation of the phase and amplitude of the fading estimated by the channel estimator 306b is compensated.
- the RAKE combining circuit 309 combines the corrected signals with RAKE and performs demodulation, outputs the data portion to a central control station (not shown), and transmits a power control command to the RF section 3. 1 Output to 3. Further, the RAKE combining circuit 309 performs the RAKE combining by adding the reception data compensated as described above to obtain a received signal.
- the channel estimation values from the channel estimation circuits 310 a and 300 b are also output to the transmission power control circuit 310.
- the multiplexing circuit 311 multiplexes the transmission power control command calculated by the transmission power control circuit 310 and the transmission signal.
- the modulation circuit 312 performs primary modulation and spread modulation such as QPSK modulation on the result.
- the transmission RF section 313 performs quadrature modulation, frequency conversion, amplification processing, and the like. For amplification, the power is controlled based on the received transmission power control command.
- This radio signal is transmitted from the antenna 301 through the antenna duplexer 302.
- the radio network controller instructs the mobile station apparatus to change all the base station apparatuses to be subjected to the diversity handover so as to increase the target quality of the transmission power control.
- This change instruction is input to the transmission power control circuit 208 of the base station device as the target quality.
- Each base station device performs transmission power control based on the changed target quality.
- the transmission power control method measures, for example, the desired wave power (S) and the interference wave power (I) in the received signal, and if the ratio (SIR) is lower than the target quality, the transmission power is increased.
- a power control command is generated, and if the ratio is higher than the target quality, a transmission power control command to reduce the transmission power is generated.
- the target quality of transmission power control is changed as appropriate for services that require urgency, services that require a certain degree of accuracy, and other special services. For example, for services that require urgency such as emergency calls (emergency calls) and services that require accuracy such as diversity handover, the target quality is higher, and urgency is not required. Is controlled not to be too high. By performing such control, it is possible to perform position detection in accordance with the required accuracy, and to reduce interference signals to other base station devices.
- a signal received by the antenna 211 is amplified by the reception RF unit 215 and frequency-converted to an intermediate frequency or a baseband frequency.
- the output signal of the reception RF section 215 is despread with a unique spreading code in the matched filter 218 and output to the delay profile measurement circuit 230 and the selection circuit 227.
- the signal received by the antenna 213 is amplified by the reception RF section 216 and frequency-converted to an intermediate frequency or a baseband frequency.
- the output signal of the reception RF unit 216 is despread with a unique spreading code in the matched filter 219, Output to the delay profile measurement circuit 230 and the selection circuit 228.
- the signal received by antenna 214 is amplified by reception RF section 217 and frequency-converted to an intermediate frequency or baseband frequency.
- the output signal of reception RF section 217 is despread by matched filter 220 with a unique spreading code, and output to delay profile measurement circuit 230 and selection circuit 229.
- the delay profile measuring circuit 230 measures the delay profile of the output signal of the matched filter 218 to 220, and the timing detecting circuit 222 detects the arrival time of each received signal. Information on the arrival time of the fastest signal (preceding wave) among them is output to the selection circuits 22 2 to 229 and the position detection circuit 224.
- the selection circuits 222 to 229 based on the information output from the timing detection circuit 222, the output signal of the matched filter 218 to 220 at the arrival time of the fastest signal arrives. Output to the estimating circuit 22 1.
- the direction-of-arrival estimation circuit 221 the direction of arrival of the received signal is estimated based on the output signals of the selection circuits 227 to 229, and the direction angle of the mobile station apparatus with respect to the own station is detected and detected.
- the information of the directional angle is output to the position detection circuit 224.
- the position detection circuit 222 the propagation delay is measured from the information on the arrival time of the fastest signal and the timing offset information, and the distance between the own station and the mobile station device is calculated. Then, terminal position information indicating the distance and the direction angle between the own station and the mobile station device is output to the wireless network controller.
- the process of simultaneously instructing the target quality for transmission power control from the radio network controller to the base station apparatus to be subjected to diversity handover that is, the same value for all base station apparatuses to be subjected to diversity handover.
- the position can be correctly detected even during diversity handover, and the interference signal to other base station devices can be reduced. Therefore, during diversity handover where reception quality is unstable, Even so, the transmission power can be controlled to a level at which the position can be detected without any trouble.
- the present invention is not limited to only such a situation. By changing the instructions from the control station that controls the station equipment in various ways, it can be applied to the case where the operation of the transmission power control is changed under a specific situation or when providing a specific service. it can.
- control is performed so that the target quality is higher for services that require urgency, and not so high for services that do not have urgency and are less accurate.
- transmission power control according to such required accuracy, it is possible to reduce interference signals to other base station apparatuses.
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
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- Radio Transmission System (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99972808A EP1052791A1 (en) | 1998-11-26 | 1999-11-22 | Base station and method of transmission power control |
AU11856/00A AU743060B2 (en) | 1998-11-26 | 1999-11-22 | Base station and method of transmission power control |
BR9907263-7A BR9907263A (pt) | 1998-11-26 | 1999-11-22 | Aparelho de estação de base e processo de controle de potência de transmissão |
CA002319166A CA2319166C (en) | 1998-11-26 | 1999-11-22 | Base station and method of transmission power control method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10/336112 | 1998-11-26 | ||
JP33611298A JP3589879B2 (ja) | 1998-11-26 | 1998-11-26 | 無線基地局装置及び送信電力制御方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000031900A1 true WO2000031900A1 (fr) | 2000-06-02 |
Family
ID=18295823
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/006501 WO2000031900A1 (fr) | 1998-11-26 | 1999-11-22 | Station base et procede ce commande de puissance d'emission |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1052791A1 (ja) |
JP (1) | JP3589879B2 (ja) |
KR (1) | KR100371726B1 (ja) |
CN (1) | CN1136676C (ja) |
AU (1) | AU743060B2 (ja) |
BR (1) | BR9907263A (ja) |
CA (1) | CA2319166C (ja) |
WO (1) | WO2000031900A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100396272B1 (ko) * | 2000-10-11 | 2003-09-02 | 삼성전자주식회사 | 이동통신시스템에서 물리 하향 공유 채널의 전송 안테나어레이를 위한 통신 수행 장치 및 방법 |
KR100538024B1 (ko) * | 2002-11-08 | 2005-12-20 | 한국전자통신연구원 | 무선 송수신 시스템 및 그 송수신 방법 |
US8116675B2 (en) | 2007-10-24 | 2012-02-14 | Samsung Electronics Co., Ltd. | Method and apparatus for handover based on dynamic beamforming scheme |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2000307489A (ja) * | 1999-04-23 | 2000-11-02 | Matsushita Electric Ind Co Ltd | 無線受信装置及び受信タイミング検出方法 |
JP3479836B2 (ja) | 2000-09-18 | 2003-12-15 | 日本電気株式会社 | Cdma受信装置 |
EP1632057B1 (en) * | 2003-06-06 | 2014-07-23 | Meshnetworks, Inc. | Mac protocol for accurately computing the position of wireless devices inside buildings |
JP4519606B2 (ja) * | 2004-11-05 | 2010-08-04 | 株式会社エヌ・ティ・ティ・ドコモ | 基地局および移動通信システム並びに送信電力制御方法 |
CN1997195B (zh) * | 2006-01-06 | 2010-05-12 | 中兴通讯股份有限公司 | 蜂窝式移动通讯系统及该系统专用测量报告处理方法 |
KR100829860B1 (ko) | 2006-09-27 | 2008-05-19 | 한국전자통신연구원 | Atc를 포함하는 위성/이동통신 시스템에서 핸드오버를고려한 전력제어 방법 |
JP2008219781A (ja) * | 2007-03-07 | 2008-09-18 | Sanyo Electric Co Ltd | 無線基地局及び無線基地局における受信方法 |
KR101744996B1 (ko) | 2011-08-11 | 2017-06-08 | 현대자동차주식회사 | 차량의 센터 플로어 판넬 어셈블리 |
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SE506759C2 (sv) * | 1996-09-30 | 1998-02-09 | Ericsson Telefon Ab L M | Anordning och förfarande för att lokalisera en mobilstation i ett cellulärt mobiltelefonsystem |
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1998
- 1998-11-26 JP JP33611298A patent/JP3589879B2/ja not_active Expired - Fee Related
-
1999
- 1999-11-22 KR KR10-2000-7008090A patent/KR100371726B1/ko not_active IP Right Cessation
- 1999-11-22 EP EP99972808A patent/EP1052791A1/en not_active Withdrawn
- 1999-11-22 WO PCT/JP1999/006501 patent/WO2000031900A1/ja not_active Application Discontinuation
- 1999-11-22 CA CA002319166A patent/CA2319166C/en not_active Expired - Fee Related
- 1999-11-22 BR BR9907263-7A patent/BR9907263A/pt not_active IP Right Cessation
- 1999-11-22 CN CNB998022748A patent/CN1136676C/zh not_active Expired - Fee Related
- 1999-11-22 AU AU11856/00A patent/AU743060B2/en not_active Ceased
Patent Citations (5)
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EP0680160A2 (en) * | 1994-04-27 | 1995-11-02 | Ntt Mobile Communications Network Inc. | Method and apparatus for transmission power control of a mobile station during soft handoff in a CDMA system |
JPH0819035A (ja) * | 1994-06-29 | 1996-01-19 | Nippon Telegr & Teleph Corp <Ntt> | 位置検出システム |
JPH08116306A (ja) * | 1994-10-14 | 1996-05-07 | N T T Ido Tsushinmo Kk | 送信電力制御方法 |
EP0809365A1 (en) * | 1996-05-22 | 1997-11-26 | Ntt Mobile Communications Network Inc. | Scheme for controlling transmission powers during soft handover in a cdma mobile communication system |
JPH1013922A (ja) * | 1996-06-21 | 1998-01-16 | Nec Corp | リバースチャネル送信電力制御方式 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100396272B1 (ko) * | 2000-10-11 | 2003-09-02 | 삼성전자주식회사 | 이동통신시스템에서 물리 하향 공유 채널의 전송 안테나어레이를 위한 통신 수행 장치 및 방법 |
KR100538024B1 (ko) * | 2002-11-08 | 2005-12-20 | 한국전자통신연구원 | 무선 송수신 시스템 및 그 송수신 방법 |
US8116675B2 (en) | 2007-10-24 | 2012-02-14 | Samsung Electronics Co., Ltd. | Method and apparatus for handover based on dynamic beamforming scheme |
Also Published As
Publication number | Publication date |
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AU1185600A (en) | 2000-06-13 |
CA2319166A1 (en) | 2000-06-02 |
KR100371726B1 (ko) | 2003-02-07 |
BR9907263A (pt) | 2000-11-14 |
EP1052791A1 (en) | 2000-11-15 |
JP3589879B2 (ja) | 2004-11-17 |
CA2319166C (en) | 2005-02-22 |
AU743060B2 (en) | 2002-01-17 |
KR20010034353A (ko) | 2001-04-25 |
CN1136676C (zh) | 2004-01-28 |
JP2000165321A (ja) | 2000-06-16 |
CN1288618A (zh) | 2001-03-21 |
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