Abstract:

This thesis focuses on the scheme of multiple clients accessing in geosynchronous satellite, analyzes the advantage and disadvantage of time division multiple access (TDMA), comes up with an improving access algorithm named free access/priority demand multiple access (FA/PDMA)based on TDMA to ensure the fairness when multiple clients accessing internet is demanded. The existing multiple access algorithm is optimized to guarantee the clients’ accessing delay and end-to-end delay when traffic packets increasing. In addition, a handoff algorithm between satellites when clients moving quickly is proposed. Finally the proposed algorithm is compared with the TDMA algorithm by using OPNET to construct internet platforms. Simulation results demonstrate the priority of FA/PDMA, draw the conclusion of the instantaneity access and effectively handoff in the case of big time delay.