Method and apparatus for doppler based multiple access communication control
First Claim
Patent Images
1. A Doppler-Based Multiple Access (DBMA) protocol method for use in a Low Earth Orbit (LEO) satellite system composed of satellites that transpond, in real time or near real time, transmissions received in an uplink frequency band, said protocol method comprising the steps of:
- at a central station, assigning a plurality of receiver units to transceivers which from time to time transmit data to the central station;
detecting at the central station whether a number of transmissions from the transceivers is near maximum capacity of the central station;
adjusting at the central station windows of eligibility for transmissions by the transceivers to insure near maximum capacity and broadcasting the windows of eligibility to the transceivers; and
at each transceiver, observing a Doppler frequency shift of a LEO satellite and controlling transmissions from the transceiver according to the window of eligibility broadcast from the central station for the transceiver.
3 Assignments
0 Petitions
Accused Products
Abstract
A single, simple but multi-moded protocol for implementation on different data transportation Low Earth Orbit (LEO) systems uses a Doppler-Based Multiple Access (DBMA) system to assign transmission times for responding transceivers. The Doppler frequency shift observed at the transceivers is used to control transmissions from them such that the system is at its maximum capacity limit at all times.
-
Citations
14 Claims
-
1. A Doppler-Based Multiple Access (DBMA) protocol method for use in a Low Earth Orbit (LEO) satellite system composed of satellites that transpond, in real time or near real time, transmissions received in an uplink frequency band, said protocol method comprising the steps of:
-
at a central station, assigning a plurality of receiver units to transceivers which from time to time transmit data to the central station; detecting at the central station whether a number of transmissions from the transceivers is near maximum capacity of the central station; adjusting at the central station windows of eligibility for transmissions by the transceivers to insure near maximum capacity and broadcasting the windows of eligibility to the transceivers; and at each transceiver, observing a Doppler frequency shift of a LEO satellite and controlling transmissions from the transceiver according to the window of eligibility broadcast from the central station for the transceiver. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A Low Earth Orbit (LEO) satellite communication system implementing a Doppler-Based Multiple Access (DBMA) protocol method comprising:
-
a plurality of LEO satellites that transpond, in real time or near real time, transmissions received in an uplink frequency band; a central station having a plurality of receiver units assigned to transceivers which from time to time transmit data to the central station, said central station detecting whether a number of transmissions from the transceivers is near maximum capacity of the central station and adjusting windows of eligibility for transmissions by the transceivers to insure near maximum capacity and broadcasting the windows of eligibility to the transceivers; and a plurality of transceivers which communicate with the central station via the LEO satellites, each transceiver observing a Doppler frequency shift of a LEO satellite and controlling transmissions from the transceiver according to the window of eligibility broadcast from the central station for the transceiver. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
Specification