Overhead reduction in system for intermittent transmission
First Claim
1. A system comprising:
- a plurality of transmitters each of which, when operative, transmits independently of any other of said plurality of transmitters and independently of any equipment for receiving from any of said plurality of transmitters, and includes, in transmitters, less than an entire transmitter identification; and
a receiver for;
(a) holding, simultaneously for each plurality of transmitters, data indicative of an expected time and an expected frequency of at least one future transmission, wherein each said plurality of transmission is transmitted by different one of said plurality of transmitters, and wherein, transmission frequency and time between transmission are controlled according to a time-frequency pattern that is different for each of said plurality of transmitters; and
(b) identifying at least one of said plurality of transmitters based on said time-frequency pattern.
0 Assignments
0 Petitions
Accused Products
Abstract
A radio transmission telemetry system includes many battery-operated radio transmitters to intermittently transmit very short messages indicative or status of sensors associated with the transmitters and a receiver to collect data from the sensors. The transmitters transmit very short messages separated by long time intervals independently of any receiver capable of receiving from any of the transmitters. Each transmitter varies the frequency for each transmission and the time between transmissions according to a sequence that is unique and based on the transmitter ID code. The receiver holds information about the expected time and the expected frequency of the future transmissions for each transmitter. The receiver identifies each source of transmissions based on its unique variations of the transmission time and frequency, thus eliminating the necessity to include any information about the transmitter ID code in the transmitted messages.
119 Citations
24 Claims
-
1. A system comprising:
-
a plurality of transmitters each of which, when operative, transmits independently of any other of said plurality of transmitters and independently of any equipment for receiving from any of said plurality of transmitters, and includes, in transmitters, less than an entire transmitter identification; and
a receiver for;
(a) holding, simultaneously for each plurality of transmitters, data indicative of an expected time and an expected frequency of at least one future transmission, wherein each said plurality of transmission is transmitted by different one of said plurality of transmitters, and wherein, transmission frequency and time between transmission are controlled according to a time-frequency pattern that is different for each of said plurality of transmitters; and
(b) identifying at least one of said plurality of transmitters based on said time-frequency pattern. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method comprising:
-
transmitting by each of a plurality of transmitter independently of any equipment for receiving from any of said plurality of transmitters and independently of any other of said plurality of transmitters, and including, in a plurality of transmission, less than an entire transmitter identification; and
holding, in a receiver, simultaneously for each plurality of transmissions, data indicative of an expected time and an expected frequency of at least one future transmission, wherein each said plurality of transmission is transmitted by difference one of said plurality of transmitters, and wherein;
transmission frequency and time between transmission are controlled according to a time-frequency pattern that is different for each of said plurality of transmitters; and
identifying at least one of said plurality of transmitters based on said time-frequency pattern. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
13. A receiver comprising:
-
logic for holding, simultaneously for each plurality of transmissions, data indicative of an expected time and an expected frequency of at least one future transmission, wherein each said plurality of transmissions is transmitted by different one of a plurality of transmitters, and wherein each of said plurality of transmitters, when operative, transmits independently of any other of said plurality of transmitters and independently of any equipment for receiving from any of said plurality of transmitters, and wherein, transmission frequency and time between transmissions are controlled according to a time-frequency pattern that is different for each of said plurality of transmitters; and
logic for identifying at least one of said plurality of transmitters on said time-frequency pattern. - View Dependent Claims (14, 15)
-
-
16. A plurality of telemetry transmitters, each of which comprises:
-
a circuit for transmitting intermittently, at various transmission frequencies, independently of any other of said plurality of transmitters, and independently of any apparatus for receiving from any of said plurality of transmitters; and
logic for controlling transmission frequency and time between transmissions according to a frequency-time pattern that is different for each of said plurality of transmitters;
wherein, in operation, each of a plurality of transmissions comprises less than an entire transmitter identification. - View Dependent Claims (17, 18, 19, 20)
-
-
21. A telemetry transmitter comprising:
-
a circuit that, in operation, transmits intermittently transmissions, at various transmission frequencies, independently of any apparatus for receiving any of said transmissions, and logic for controlling transmission frequency and time between transmissions based on a predetermined frequency-time pattern dependent on a transmitter identification code or a number associated with said identification code, wherein each of a plurality of said transmission comprises less than the entire said transmitter identification code. - View Dependent Claims (22, 23, 24)
-
Specification