H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/11
H04J 3/06 (2006.01) H04B 7/14 (2006.01) H04L 7/00 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 1157591
BYTE DATA ACTIVITY COMPRESSION Abstract In a TDMA satellite communications system, the data ports at two different earth stations have their data rates synchronized. The origination port stores the last eight-bit byte of data in each 480-bit packet which is transmitted via the satellite. The last byte is compared with each of the 60 bytes of data in the next channel's worth of information received from the ter- restrial source. If all of the bytes of data in the new channel's worth of information are identical to the last byte of data transmitted from the originating port, no information is transmitted for this data port in the next TDMA frame. The synchronized data port at the receiving earth station expects a channel's Worth of data to be received during the next TDMA frame. The last byte of received data for the recipient data port in the last frame is stored. If no data is received by the recipient data port in the present frame, the data port will infer that the next 60 bytes of data in the channel which would have been received in the present frame are each replications of the stored last byte of data. The receiving port then replicates the last byte of data 60 times and delivers it to the recipient terrestrial receiver connected to the data port. The transmitting data port will continue to not transmit succeeding channel's worth of data for every new channel MA9-80-002 whose bytes are the replication of the last byte stored from the last frame. The recipient data port at the destination earth station will continue to infer that the succeeding channels which are not received from the originating station are in fact replications of the last byte stored from the last received channel, for every TDMA frame which does not contain a transmission from the originating data port. Thus, without the necessity for transmitting control information such as a VAC mask to affirmatively signal the destination data port that byte replication is to be carried out, the destination station will continue to replicate succeeding channels of information for an arbitrary number of TDMA frames. MA-80-002
372425
Barrett B.p.
International Business Machines Corporation
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