Title :
Random access for a multibeam satellite with dynamic transponder switching
Author :
Wu, Cheng-Shong ; Li, Victor O K
Author_Institution :
Dept. of Electr. Eng. Syst., Univ. of Southern California, Los Angeles, CA, USA
Abstract :
A multibeam satellite communications network serving multiple zones with S-Aloha random-access uplinks and dynamically switched transponders in the downlinks is studied. The overhead of switching transponders between zones may degrade the performance of the system significantly. Two different strategies are introduced and studied. In the Guard Time strategy, each slot time is equal to the packet transmission time plus the transponder switching time, allowing the transponder to be pointed to a new zone at the beginning of each slot. In the Idle Waiting strategy, each slot time is equal to the packet transmission time. If a transponder is switched to a new zone, it will take k slot time, where k is the smallest integer greater than the switching time divided by the slot time. The throughputs of these two strategies are analyzed and compared.<>
Keywords :
multi-access systems; packet switching; protocols; satellite relay systems; Guard Time strategy; Idle Waiting strategy; S-Aloha random-access uplinks; dynamic transponder switching; dynamically switched transponders; multibeam satellite communications network; multiple zones; packet transmission time; slot time; transponder switching time; Artificial satellites; Communication networks; Communication switching; Degradation; Downlink; Dynamic scheduling; Packet switching; Throughput; Time division multiple access; Transponders;
Conference_Titel :
INFOCOM '88. Networks: Evolution or Revolution, Proceedings. Seventh Annual Joint Conference of the IEEE Computer and Communcations Societies, IEEE
Conference_Location :
New Orleans, LA, USA
Print_ISBN :
0-8186-0833-1
DOI :
10.1109/INFCOM.1988.13019
