Transmission of urgent messages in telemetry system
First Claim
1. A system comprising:
- a plurality of transmitters, each of which is for transmitting intermittently;
(a) routine transmissions, at first time intervals, and (b) urgent transmissions, in response to urgency, at transmission opportunities at second time intervals;
wherein each of said plurality of transmitters is for transmitting independently of any receiver for receiving any of said transmissions and independently of any of said plurality of transmitters, anda receiver for holding, simultaneously for each of said plurality of transmitters, data indicative of;
an expected time of at least one future transmission opportunity.
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Accused Products
Abstract
A radio transmission system including many radio transmitters using frequency hopping carriers to intermittently transmit very short messages indicative of status of stimuli associated with the transmitters. The transmitters transmit transmissions independently of a receiver receiving the transmissions and independent of each other. In operation, radio transmitters transmit messages at varying frequencies at time intervals that can be varied as well. The frequency and time intervals are varied according to patterns that can be determined individually for each transmitter. A receiver holds data indicative of the future transmission frequency and time for each transmitter and updates the data based on the time and the content of the received messages. In addition, a simple method is provided to generate a very large number of orthogonal frequency-time hopping sequences that are individual for each transmitter and based on the transmitter ID. The problem of transmission of urgent messages is solved by transmitting urgent transmissions at transmission opportunities having precise time and frequencies that, advantageously, are in relations with the routine transmissions. The problem of power-up synchronization in such system is solved by rapidly transmitting, at transmission opportunities, a sequence of synchronization transmissions that carry information about the time and the frequency of a future routine transmission.
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Citations
29 Claims
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1. A system comprising:
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a plurality of transmitters, each of which is for transmitting intermittently;
(a) routine transmissions, at first time intervals, and (b) urgent transmissions, in response to urgency, at transmission opportunities at second time intervals;
wherein each of said plurality of transmitters is for transmitting independently of any receiver for receiving any of said transmissions and independently of any of said plurality of transmitters, anda receiver for holding, simultaneously for each of said plurality of transmitters, data indicative of;
an expected time of at least one future transmission opportunity. - View Dependent Claims (2, 3, 4, 5)
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6. A method comprising:
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transmitting intermittently, by each of a plurality of transmitters;
(a) routine transmissions, at first time intervals, and (b) urgent transmissions, in response to urgency, at transmission opportunities at second time intervals;
wherein said transmissions are independent of any receiver for receiving any of said transmissions and independent of any of said plurality of transmitters, andholding, in a receiver, simultaneously for each of said plurality of transmitters, data indicative of;
an expected time of at least one future transmission opportunity. - View Dependent Claims (7, 8, 9, 10)
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11. A receiver comprising:
logic for holding, simultaneously for each plurality of transmission opportunities, data indicative of an expected time of at least one future transmission opportunity, wherein each said plurality of transmission opportunities is for a different one of a plurality of transmitters, and wherein each of said plurality of transmitters is for transmitting intermittently (a) routine transmissions, at time intervals, and (b) urgent transmissions, in response to urgency, at at least one of said transmission opportunities, wherein each of said plurality of transmitters is for transmitting independently of any receiver for receiving any of said transmissions and independently of any other of said plurality of transmitters. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A plurality of transmitters, each of which comprises:
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a circuit for transmitting intermittently;
(a) routine transmissions, at first time intervals, and (b) urgent transmissions, in response to urgency, at transmission opportunities at second time intervals, andwherein each of said plurality of transmitters is for transmitting independently of any receiver for receiving any of said transmissions and independently of any other of said plurality of transmitters. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A transmitter comprising:
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a circuit for transmitting intermittently and at various transmission frequencies;
(a) routine transmissions, at first time intervals, and (b) urgent transmissions, in response to urgency, at transmission opportunities at second time intervals, andlogic for controlling frequency and time for said transmission opportunities and said routine transmissions independently of any receiver for receiving any of said transmissions. - View Dependent Claims (26, 27, 28, 29)
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Specification