Method and system of frame timing synchronization in TDMA based mobile satellite communication system
First Claim
1. A method of synchronizing a transmitted frame timing in a mobile satellite communication system comprising the steps of:
- receiving a timing reference signal from a satellite;
deriving the time of receiving of said timing reference signal;
adjusting the time of receiving of said timing reference signal based on satellite ephemeris information;
broadcasting a control signal to said system;
receiving said control signal from said system;
deriving the time of receiving of said control signal;
comparing the adjusted time of receiving of said timing reference signal with the time of receiving of said control signal; and
adjusting said transmitted frame timing based on said comparison.
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Accused Products
Abstract
A method and system for synchronizing transmission TDMA frames in a mobile satellite communication system are disclosed herein. The method of synchronizing a transmitted frame timing in a mobile satellite communication system comprises the steps of broadcasting a frame timing offset from a satellite to a mobile terminal having a timer, receiving the frame timing offset information transmitted by the satellite in the mobile terminal, and adjusting the timer in the mobile terminal based on the timing offset information. The system includes a plurality of mobile terminals; a satellite adapted to communicate with each of the mobile terminals, the satellite having a satellite reference frame timing; at least one gateway in communication with the satellite, the gateway having a digital processor, the digital processor including a routine for calculating a frame timing offset; with the gateway transmitting the timing offset to at least one of the mobile terminals, the at least one mobile terminal receiving the timing offset and adjusting the mobile terminal transmit frame timing to compensate for the timing offset.
140 Citations
16 Claims
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1. A method of synchronizing a transmitted frame timing in a mobile satellite communication system comprising the steps of:
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receiving a timing reference signal from a satellite; deriving the time of receiving of said timing reference signal; adjusting the time of receiving of said timing reference signal based on satellite ephemeris information; broadcasting a control signal to said system; receiving said control signal from said system; deriving the time of receiving of said control signal; comparing the adjusted time of receiving of said timing reference signal with the time of receiving of said control signal; and adjusting said transmitted frame timing based on said comparison. - View Dependent Claims (2)
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3. A method of synchronizing a transmitted frame timing in a mobile satellite communication system comprising the steps of:
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broadcasting a frame timing offset from a satellite to mobile terminal having a timer; receiving said frame timing offset information transmitted by said satellite in said mobile terminal; and adjusting said timer in said mobile terminal based on said timing offset information and satellite ephemeris information stored in said mobile terminal.
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4. A method of synchronizing a transmitted frame timing in a mobile satellite communication system comprising the steps of:
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broadcasting a frame timing offset from a gateway terminal to a mobile terminal having a timer; receiving said frame timing offset information transmitted by said gateway in said mobile terminal; and adjusting said timer in said mobile terminal based on said timing offset information and satellite ephemeris information stored in said mobile terminal. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A mobile satellite communication system comprising:
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a plurality of mobile terminals; a satellite adapted to communicate with each of said mobile terminals, said satellite having a satellite reference frame timing; at least one gateway in communication with said satellite, said gateway having a digital processor, said digital processor including a routine for calculating a frame timing offset; said gateway transmitting said timing offset to at least one of said mobile terminals, said at least one mobile terminal receiving said timing offset and adjusting a mobile terminal transmit frame timing to compensate for said timing offset. - View Dependent Claims (15, 16)
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Specification