Enhanced access burst for random access channels in TDMA mobile satellite system
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H04B-072/12
출원번호
US-0784873
(1997-01-16)
발명자
/ 주소
Hatzipapafotiou Dimitrios
출원인 / 주소
Lockheed Martin Corporation
대리인 / 주소
Meise
인용정보
피인용 횟수 :
36인용 특허 :
6
초록▼
A spacecraft (12) cellular TDMA communications system (10) includes many user terminals (16), some of which may be movable. The spacecraft repeats transmissions by way of spot beams (20). A user initiates communication by synchronizing to the TDMA slots (210, 212), and transmits an access request si
A spacecraft (12) cellular TDMA communications system (10) includes many user terminals (16), some of which may be movable. The spacecraft repeats transmissions by way of spot beams (20). A user initiates communication by synchronizing to the TDMA slots (210, 212), and transmits an access request signal. The access request signal is transmitted in at least two slots. The first slot contains time and frequency PN synch information, and the second slot contains one of (a) the user terminal's ID code and (b) a code representing the desired type of access. After this message is transmitted and received, the user terminal may transmit the PN synch information on a third slot, followed by the other one of the user terminal's ID code and the access-representative code.
대표청구항▼
[ What is claimed is:] [1.] A spacecraft TDMA cellular communications system, for communicating traffic signals between disparate terrestrial locations by way of successive temporally-interleaved signal bursts, said system comprising:a spacecraft including transmitting and receiving means, and an an
[ What is claimed is:] [1.] A spacecraft TDMA cellular communications system, for communicating traffic signals between disparate terrestrial locations by way of successive temporally-interleaved signal bursts, said system comprising:a spacecraft including transmitting and receiving means, and an antenna arrangement coupled to said transmitting and receiving means, for forming a plurality of spot beams, each of which defines a footprint, which footprints of said spot beams may partially overlap;at least one network control center located in one of said footprints, for transmitting electromagnetic control signals to said spacecraft, and for receiving electromagnetic control signals from said spacecraft, for controlling the timing of said temporal bursts;at least one gateway terrestrial terminal located in one of said footprints, each one of said at least one gateway terrestrial terminal being coupled to a terrestrial communications system, for coupling said terrestrial communications system with said spacecraft communications system, said gateway terrestrial terminal being for transmitting electromagnetic traffic signals to said spacecraft, and for receiving electromagnetic traffic signals from said spacecraft;a plurality of user terrestrial terminals, at least some of said user terrestrial terminals being located in said footprints, each of said user terrestrial terminals being for transmitting electromagnetic signals to said spacecraft, and for receiving electromagnetic signals from said spacecraft, each of said user terrestrial terminals including access request signal generating means for generating access request signals at the inception of a communication by said user terrestrial terminal, and for transmitting said access request signals by way of said electromagnetic signals to a selected a least one of said network control center each of said access request signals including time and frequency synchronization components and also including information components, said synchronization component of said access request signals being transmitted on a first burst of said TDMA, and said information component of said access request signals being transmitted on at least a second burst of said TDMA, later in time than said first burst.
연구과제 타임라인
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이 특허에 인용된 특허 (6)
Sowles Kenneth L. (Chandler AZ) Gregg Ralph C. (Tempe AZ) Olds Keith A. (Mesa AZ), Apparatus for mobile unit acquisition in a satellite communication system and method therefor.
Lautier Alex (Nice FRX) Monrolin Jean L. (La Gaude FRX), Method and system for synchronizing a TDMA communication network comprising a satellite equipped with several directiona.
Wiedeman Robert A. (Los Altos CA) Monte Paul A. (San Jose CA), Satellite communication system that is coupled to a terrestrial communication network and method.
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