[특허]User equipment using combined closed loop/open loop power control

[미국특허] User equipment using combined closed loop/open loop power control 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-001/69 H04B-001/707
출원번호	US-0136239 (2005-05-24)
발명자 / 주소	Zeira,Ariela Ozluturk,Fatih M. Shin,Sung Hyuk
출원인 / 주소	InterDigital Technology Corporation
대리인 / 주소	Volpe and Koenig, P.C.
인용정보	피인용 횟수 : 5 인용 특허 : 21

초록 ▼

At a first communication station, communications from a second communication station are received. The first station transmits power commands based on in part a reception quality of the received communications. From the first communication station, a first communication having a transmission power level in a first time slot is transmitted. At the second communication station, the first communication and the power commands are received. A power level of the first communication as received is measured. A pathloss estimate is determined based on in part the measured received first communication power level and the first communication transmission power level. A transmission power level is set for a second communication in a second time slot from the second station to the first station based on in part the pathloss estimate weighted by a quality factor and the power commands.

대표청구항 ▼

What is claimed is: 1. A method for controlling transmission power levels in a spread spectrum time division duplex communication system having frames with time slots for communication, the method comprising: receiving at a first communication station communications from a second communication station and transmitting from the first station power commands based on in part a reception quality of the received communications; transmitting from the first communication station a first communication having a transmission power level in a first time slot; receiving at the second communication station the first communication and the power commands; measuring a power level of the first communication as received; determining a pathloss estimate based on in part the measured received first communication power level and the first communication transmission power level; and setting a transmission power level for a second communication in a second time slot from the second station to the first station based on in part the pathloss estimate weighted by a quality factor and the power commands. 2. The method of claim 1 wherein the set transmission power level is based on in part a desired received power level at the first station, a closed loop factor and an open loop factor; wherein the closed loop factor is based on in part the received power commands and the open loop factor is based on in part the pathloss estimate weighted by the quality factor. 3. The method of claim 1 wherein the set transmission power level is based on in part a desired received power level at the first station and a combined closed loop/open loop factor; wherein the combined closed loop/open loop factor is based on in part the received power commands and the pathloss estimate weighted by the quality factor. 4. The method of claim 2 wherein the closed loop factor is updated for each received power command. 5. The method of claim 3 wherein the combined factor is updated for each received power command. 6. The method of claim 2 wherein the desired received power level is based on in part a target signal to interference ratio and a measured interference level at the first station. 7. The method of claim 3 wherein the desired received power level is based on in part a target signal to interference ratio and a measured interference level at the first station. 8. The method of claim 1 wherein the first station is a base station and the second station is a user equipment. 9. The method of claim 1 wherein the first station is a user equipment and the second station is a base station. 10. A code division multiple access user equipment for controlling transmission power levels, the user equipment comprising: means for receiving a first communication and power commands; measuring a power level of the first communication as received; determining a pathloss estimate based on in part the measured received first communication power level and a first communication transmission power level; and setting a transmission power level for a second communication based on in part the pathloss estimate weighted by a quality factor and the power commands wherein said quality factor is determined based on in part a number of time slots, D, between a first and a second time slot. 11. The user equipment of claim 10 wherein the set transmission power level is based on in part a desired received power level, a closed loop factor and an open loop factor; wherein the closed loop factor is based on in part the received power commands and the open loop factor is based on in part the pathloss estimate weighted by the quality factor. 12. The user equipment of claim 10 wherein the set transmission power level is based on in part a desired received power level at the first station and a combined closed loop/open loop factor; wherein the combined closed loop/open loop factor is based on in part the received power commands and the pathloss estimate weighted by the quality factor. 13. The user equipment of claim 11 wherein the closed loop factor is updated for each received power command. 14. The user equipment of claim 12 wherein the combined factor is updated for each received power command. 15. The user equipment of claim 11 wherein the desired received power level is based on in part a target signal to interference ratio and a measured interference level. 16. The user equipment of claim 12 wherein the desired received power level is based on in part a target signal to interference ratio and a measured interference level.

이 특허에 인용된 특허 (21) 인용/피인용 타임라인 분석

Soliman Samir S., Accurate open loop power control in a code division multiple access communication system.
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Lomp Gary R., Adjusting a transmitter power level for a spread spectrum transmitter.
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Haartsen, Jacobus Cornelis; Mattisson, Sven, Automatic power control in uncoordinated frequency-hopping radio systems.
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Ramesh, Rajaram; Wang, Yi-Pin Eric, Channel estimates in a CDMA system using power control bits.
상세보기
Zeira, Ariela; Ozluturk, Faith M.; Shin, Sung-Hyuk, Combined closed loop/open loop power control in a time division duplex communication system.
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Zeira, Ariela; Ozluturk, Fiath M.; Shin, Sung-Hyuk, Combined closed loop/open loop power control in a time division duplex communication system.
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Bringby Daniel,SEX ; Lundborg Tomas,SEX, Initial transmit power determination in a radiocommunication system.
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Soliman Samir S., Load monitoring and management in a CDMA wireless communication system.
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Prescott Tobin A., Method and apparatus for adaptive closed loop power control using open loop measurements.
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Gilhousen Klein S. (San Diego CA) Padovani Roberto (San Diego CA) Wheatley ; III Charles E. (Del Mar CA), Method and apparatus for controlling transmission power in a CDMA cellular mobile telephone system.
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Tao Chen ; Jack M. Holtzman ; Keith Saints ; Charles E. Wheatley, III ; Fuyun Ling ; Nagabhushana Sindhushayana, Method and apparatus for controlling transmission power in a potentially transmission gated or capped communication system.
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Hakkinen Hannu,FIX, Method and apparatus for controlling transmission power of a radio transmitter.
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Fredrik Gunnarsson SE; Jonas Blom SE; Fredrik Gustafsson SE, Method and system for quality-based power control in cellular communications systems.
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Chuah Mooi Choo, Method for establishment of the power level for uplink data transmission in a multiple access system for communications networks.
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Hottinen Ari,FIX ; Keskitalo Ilkka,FIX ; Kiema Arto,FIX ; Jolma Petri,FIX ; Kuhn Ingo,FIX ; Savusalo Jari,FIX ; Uola Risto,FIX ; Siira Anne,GBX ; Karkkainen Ari,FIX, Method for estimating received power and a receiver.
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Ivanov Kolio (Munich DEX) Metzner Norbert (Treuchtlingen DEX), Method for transmission power control of a mobile station.
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Mallinckrodt Albert Jack, Power control of an integrated cellular communications system.
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McDavid William T. (Allen TX) Bryce William W. (Dallas TX), Power leveling telemetry system.
상세보기
Paul E. Bender ; Roberto Padovani, Synchronization of forward link base station power levels during handoff between base station sectors in a mobile radio communication system.
상세보기
Zeira, Ariela; Shin, Sung-Hyuk; Dick, Steven G., User equipment employing a time division duplex technique.
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Zeira, Ariela; Shin, Sung-Hyuk, User equipment utilizing weighted open loop power control.
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이 특허를 인용한 특허 (5) 인용/피인용 타임라인 분석

Sutskover, Ilan; Ben-Eli, David, Method and apparatus to vary power level of training signal.
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Jones, Alan E.; Anderson, Nicholas W., Method and arrangement for noise variance and SIR estimation.
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Dominique, Francis; Kong, Hongwel; Nabhane, Walid E., Method of estimating a current channel condition in a wireless communications network.
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Lim, Lysander; Pehlke, David; Khoury, John; Leung, Vincent, Power control scheme for a power amplifier.
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Thomsen, Axel; Wang, Zhongda; Wong, Sai Chu; Huang, Yunteng, Providing automatic power control for a power amplifier.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] User equipment using combined closed loop/open loop power control 원문보기