TDMA mobile ad-hoc network (MANET) with second order timing and tracking
First Claim
1. A communications system, comprising:
- a plurality of mobile nodes forming a mobile ad-hoc network (MANET) and having a network clock time;
a plurality of wireless communications links connecting the mobile nodes together;
each mobile node comprising a communications device and controller for transmitting and routing data packets wirelessly to other mobile nodes via the wireless communications link using a time division multiple access (TDMA) data transmission, each mobile node communicating at a selected guard time and further comprising a clock circuit having a physical clock time, wherein a clock circuit is operative for for establishing a virtual clock time based on a timing error adjustment obtained from a clock mean value subtracted from the physical clock time, wherein said virtual clock time is processed with the physical clock time to establish a second order internal clock compensation factor as a learned and accumulated value and obtain a virtual clock drift rate that is used to correct any clock timing errors of the physical clock time from the network clock time and reduce the guard time.
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Accused Products
Abstract
A communication system includes a plurality of mobile nodes forming a mobile ad-hoc network (MANET) and having a network clock time. A plurality of wireless communications links connects the mobile nodes together. Each mobile node includes a communications device and controller for transmitting and routing data packets wirelessly to other mobile nodes via the wireless communications link using a Time Division Multiple Access (TDMA) data transmission. Each mobile node includes a clock circuit having a digital clock time. A clock circuit is operative for processing a second order internal clock compensation factor as a learned and accumulated value for establishing a virtual clock time to correct any clock timing errors of the physical clock time from the network clock time.
21 Citations
23 Claims
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1. A communications system, comprising:
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a plurality of mobile nodes forming a mobile ad-hoc network (MANET) and having a network clock time; a plurality of wireless communications links connecting the mobile nodes together; each mobile node comprising a communications device and controller for transmitting and routing data packets wirelessly to other mobile nodes via the wireless communications link using a time division multiple access (TDMA) data transmission, each mobile node communicating at a selected guard time and further comprising a clock circuit having a physical clock time, wherein a clock circuit is operative for for establishing a virtual clock time based on a timing error adjustment obtained from a clock mean value subtracted from the physical clock time, wherein said virtual clock time is processed with the physical clock time to establish a second order internal clock compensation factor as a learned and accumulated value and obtain a virtual clock drift rate that is used to correct any clock timing errors of the physical clock time from the network clock time and reduce the guard time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A mobile ad-hoc network (MANET), comprising:
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a source mobile node, a destination mobile node, and a plurality of neighboring mobile nodes, each mobile node comprising a communications device and controller for transmitting and routing data packets wirelessly to other mobile nodes using a time division multiple access (TDMA) data transmission at a selected guard time; each mobile node further comprising a clock circuit having a physical clock time; and wherein a clock circuit is operative for establishing a virtual clock time based on a timing error adjustment obtained from a clock mean value subtracted from the physical clock time, wherein said virtual clock time is processed with the physical clock time to establish a second order internal clock compensation factor as a learned and accumulated value and obtain a virtual clock drift rate that is used to correct any clock timing errors of the physical clock time from a network clock time and reduce the guard time. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for communicating between mobile nodes within a mobile ad-hoc network (MANET) using a time division multiple access (TDMA) data transmission, comprising:
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transmitting and routing data packets wirelessly to other mobile nodes via wireless communications links at a selected guard time, each mobile node comprising a communications device, controller and a clock circuit having a physical clock time; establishing a virtual clock time based on a timing error adjustment obtained from a clock mean value subtracted from the physical clock time; and processing the virtual clock time with the physical clock time to establish a second order internal clock compensation factor as a learned and accumulated value and obtain a virtual clock drift rate that is used to correct any clock timing errors of the physical clock time from a network clock time to reduce the guard time. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification