[특허]Skywave adaptable network transceiver apparatus and method using a stable probe and traffic protocol

Skywave adaptable network transceiver apparatus and method using a stable probe and traffic protocol 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04J-001/00 H04J-004/00 H04B-017/00
출원번호	US-0993495 (1992-12-18)
발명자 / 주소	Weddle Daniel O. (Plano TX) Young C. David (Richardson TX)
출원인 / 주소	Rockwell International Corporation (Seal Beach CA 02)
인용정보	피인용 횟수 : 66 인용 특허 : 0

초록 ▼

In the skywave adaptable communication network, the time required to initiate communications between two transceivers can often be an important factor where the propagation characteristics of signals at various frequencies may vary drastically with time. The present invention not only improves upon known prior art by accepting the first frequency that it hears as a communication frequency when two nodes are attempting to communicate from a known list of probe and default frequencies to be transmitted at known times, it uses an “announce and do”protocol to establish initial link-up and to change traffic frequencies or other system parameters once link-up has occurred to obtain coordination between both communicating nodes in a network of communicating nodes. The announce and do protocol requires multiple frequency announcements but the multi-frequency can be traffic frequency and a probe frequency or it can be multiple traffic frequencies whereby there is another communicating channel besides the channel which is involved in the changed system parameters. Once link-up has occurred, the probe signals are used to allow the system to then adaptively change the traffic frequencies to obtain better quality traffic signals, as these better quality probe signals are received, analyzed and compared with the quality of the present working frequency signals.

대표청구항 ▼

A network of identical transceiver nodes for relaying traffic messages from node where each node can communicate with multiple predetermined neighbor nodes on a time multiplexed basis with separate time slots for transmitting each of said neighbor nodes intermixed with further separate time slots for receiving from said neighbor nodes, each of said nodes having a unique identification assigned thereto and each of said nodes comprising, in combination: list means for causing initially transmitted probe signals to any given neighbor node to be at a base carrier frequency ascertained in accordance with a predetermined list of frequencies and a given frequency-time algorithm; preamble means for generating a network-unique signature synchronization preamble based upon a unique identification assigned to an intended receiving node in the preamble, wherein a receiving node can establish synchronization preparatory to receiving data; data supplying means for providing control and traffic data to be transmitted; probe transmission means, connected to said list means, and data supplying means and said preamble means, for normally transmitting, as a probe signal, a first predetermined duration preamble and then a first predetermined number of control data bits in one of first and second portions of a transmit time slot where said first predetermined duration preamble is of a duration sufficient to resolve uncertainties in the time of arrival of the beginning of a probe on a given probe carrier frequency, to enable recognition, by a given receiving neighbor node, of the presence of a probe and the beginning of a data portion following the preamble; traffic transmission means, connected to said list means, and said data supplying means and said preamble means, for normally transmitting, as a traffic signal after a condition of link-up has been recognized by a node, a second predetermined duration preamble and then a second predetermined number of data bits in the other of said first and second portions of the transmit time slot, the second duration preamble being substantially less in duration than said first duration preamble while being sufficient to resolve uncertainties in the time of arrival after approximate time of arrival has been measured and stored for a given traffic carrier frequency, to enable the recognition, by a given receiving neighbor node, of the presence of a traffic preamble and the beginning of data following the preamble; receiving and measuring means for receiving probe transmissions of different base probe carrier frequencies and measuring the quality and time of reception, relative to a reference, of the receiving transmissions; and means, connected to said data supplying means, for informing a given neighbor node of a carrier frequency to be used for future traffic preamble and data portions.

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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

Skywave adaptable network transceiver apparatus and method using a stable probe and traffic protocol 원문보기

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Skywave adaptable network transceiver apparatus and method using a stable probe and traffic protocol 원문보기

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