[특허]Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system

Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-001/04
출원번호	UP-0622383 (2007-01-11)
등록번호	US-7734260 (2010-06-29)
발명자 / 주소	Tiedemann, Jr., Edward G. Weaver, Jr., Lindsay A. Padovani, Roberto
출원인 / 주소	QUALCOMM Incorporated
대리인 / 주소	Patel, Rupit
인용정보	피인용 횟수 : 0 인용 특허 : 33

초록 ▼

Collisions between messages simultaneously transmitted by multiple spread-spectrum transmitters are reduced by distributing the transmissions over the available resources of the receiver. Each mobile station in a CDMA system uses one or more randomization methods to distribute its transmissions. In the first randomization, the mobile station time-delays its transmissions by a number of chips of the PN code with which it spreads the transmitted signal. In a second randomization, the mobile station randomly selects the PN code. In a third randomization, the mobile station inserts a random delay between successive message transmissions or probes if it does not receive an acknowledgement after a predetermined timeout period. A predetermined number of such transmissions is called a probe sequence. In a fourth randomization, the mobile station inserts a relatively long random delay between successive probe sequences if it does not receive an acknowledgement of any probe in the sequence.

대표청구항 ▼

What is claimed is: 1. A method for reducing interference in a communication channel used by at least one of a plurality of first transceivers to initiate communication with a second transceiver, said method comprising the steps of: selecting, randomly, a first time delay within a predetermined range; transmitting from said at least one first transceiver an access probe at a first power level after said first randomly selected time delay, said first power level being determined on the basis of amount of power at which a signal transmitted from said second transceiver is received; determining whether said access probe has been received at said second transceiver based on reception of an acknowledgement from said second transceiver; if said access probe has not been received, selecting, randomly, a second time delay within said predetermined range; and retransmitting said access probe, after said second randomly selected time delay, from said at least one first transceiver at a power level greater than said first power level. 2. The method of claim 1 further including the step of upon receiving said access probe, transmitting said acknowledgment signal from said second transceiver to said at least one first transceiver. 3. The method of claim 1 wherein said at least one first transceiver is a mobile radio telephone and said second transceiver is a base station. 4. The method of claim 1 wherein said access probe is transmitted using spread-spectrum signal coding. 5. The method of claim 1 wherein said step of transmitting further includes the step of generating said access probe using a spreading code selected from a predefined set of spreading codes. 6. The method of claim 5 wherein each code in said predefined set of codes corresponds to a different access channel. 7. The method of claim 1, wherein the predetermined range is a predetermined number of time slots. 8. The method of claim 7, wherein the first and second time delays are measured as a number of time slots within said predetermined number of time slots. 9. A mobile radio unit for communicating with a base station, comprising: means for selecting, randomly, a first time delay within a predetermined range; means for transmitting an access probe at a first power level after said first randomly selected time delay to said base station, said first power level being determined on the basis of amount of power at which a signal transmitted from said base station is received; means for detecting an acknowledgment signal from said base station; wherein said acknowledgment signal indicating reception of said access probe at said base station; if said access probe has not been received, said means for selecting further for selecting, randomly, a second time delay within said predetermined range; and means for commanding said means for transmitting to retransmit said access probe, after said second randomly selected time delay, at a power level greater than said first power level. 10. The mobile radio unit of claim 9 wherein said means for transmitting includes means for selecting a spreading code corresponding to an access channel used to transmit said access probe. 11. The mobile radio unit of claim 10, wherein the predetermined range is a predetermined number of time slots. 12. The mobile radio unit of claim 11, wherein the first and second time delays are measured as a number of time slots within said predetermined number of time slots. 13. A communications system with minimized access channel interference, comprising: a plurality of mobile radio units, each mobile radio unit including: means for transmitting an access probe initially at a first power level and after a first randomly selected time delay within a predetermined range, and retransmitting said access probe at a power level greater than said first power level and after a second randomly selected time delay within said predetermined range until said access probe is received; means for determining whether said access probe has been received based on reception of an acknowledgment indicating reception of said access probe; at least one base station including: means for receiving transmissions of said access probe during any randomly selected time delays within said predetermined range; means for transmitting said acknowledgment message to the mobile radio unit from which at least one of said access probes is received; wherein said first power level is determined on the basis of amount of power at which a signal transmitted from said at least one base station is received. 14. The system of claim 13 wherein each said mobile radio unit includes means for generating each said access probe using one of a set of access channel codes. 15. The system of claim 14 wherein said set of access channel codes correspond to a range of access channels. 16. The system of claim 14 wherein said mobile station includes means for selecting one of said access channel codes. 17. The system of claim 13, wherein the predetermined range is a predetermined number of time slots. 18. The system of claim 17, wherein the first and second time delays are measured as a number of time slots within said predetermined number of time slots.

이 특허에 인용된 특허 (33)

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Vancraeynest Jan P. (White Plains NY), Clock acquisition in a spread spectrum system.
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Stengel Robert E. (Fort Lauderdale) Davenport Roger A. (Fort Lauderdale FL), Communication system capable of adjusting transmit power of a subscriber unit.
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Gilhousen Klein S. (San Diego CA) Padovani Roberto (San Diego CA) Wheatly ; III Charles E. (Del Mar CA), Diversity receiver in a CDMA cellular telephone system.
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Un Chong K. (Seoul KRX) Ryu Seung M. (Chungnam KRX) Lee Chong R. (Seoul KRX), Local area network system utiliziing a code division multiple access method.
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Kaman Richard A. (Lake Zurich IL) Felix Kenneth A. (Crystal Lake IL) Smanski Philip J. (Palatine IL) Haug John R. (Mount Prospect IL), Method and apparatus for automatically attempting to seize a radio channel in a multichannel communication system.
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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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Buchenhorner Michael J. (Coral Gables FL) Ghomeshi Mohammad M. (Ft. Lauderdale FL) Shapiro Steven C. (Lake Worth FL), Method and apparatus for establishing a communication link.
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Schmidt Werner (Roscommon IEX), Method and apparatus for handing-over a radio connection from one radio cell to another radio cell of a digital radio tr.
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Procter Lee M. (Elgin IL) Jayapalan Jay P. (Buffalo Grove IL), Method and apparatus for multiplexing control information into a user signal stream of a CDMA cellular system.
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Ozluturk Faith M. ; Lomp Gary R., Method of controlling initial power ramp-up in CDMA systems by using short codes.
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Borup Gottlob (Gravinge DKX) Pedersen Flemming H. (Soto Del Res ESX), Method of coupling a data transmitter unit to a signal line and apparatus for performing the invention.
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Hunt V. Bruce (2070-B Liberty Park Ave. Menlo Park CA 94025), Multipoint packet data communication system using random access and collision detection techniques.
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Grau ; Jr. Juan (San Mateo CA) Messenger Brian S. (San Jose CA), Radio communication system using spread spectrum techniques.
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Malek Charles J. (Crystal Lake IL) McDonald James A. (Buffalo Grove IL), Signal overlap detection in a communication system.
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Paneth Eric (San Diego CA) Handzel Mark J. (San Diego CA) Morley Steven A. (San Diego CA) Avis Graham M. (San Diego CA), Subscriber RF telephone system for providing multiple speech and/or data signals simultaneously over either a single or.
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Gilhousen Klein S. (San Diego CA) Jacobs Irwin M. (La Jolla CA) Padovani Roberto (San Diego CA) Weaver ; Jr. Lindsay A. (San Diego CA) Viterbi Andrew J. (La Jolla CA), System and method for generating signal waveforms in a CDMA cellular telephone system.
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Gilhousen Klein S. (San Diego CA) Jacobs Irwin M. (La Jolla CA) Padovani Roberto (San Diego CA) Weaver ; Jr. Lindsay A. (San Diego CA) Wheatley ; III Charles E. (Del Mar CA) Viterbi Andrew J. (La Jol, System and method for generating signal waveforms in a CDMA cellular telephone system.
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Balogh, Dan Anthony; Burgess, John K.; Cheng, Terry Si-Fong; Huang, Ching Yao; Yu, Shawn S., System and method for variably delaying access requests in wireless communications system.
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Haruyama Hideaki (Yokohama JPX) Kobayashi Hiroshi (Tokyo JPX), System for adjusting signal transmission timing to prevent signal collisions.
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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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연합인증

Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system 원문보기

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Apparatus and method for reducing message collision between mobile stations simultaneously accessing a base station in a CDMA cellular communications system 원문보기

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