TCP gateway for satellite-based Internet service accommodating multiple subscribers

Satellite-based Internet is one of attractive access media because it can be deployed even in inconvenient locations. However, it is a problem that TCP throughput is degraded by the large propagation delay in the satellite link. We previously proposed to introduce an intermediate gateway only in the carrier side premises to accelerate TCP throughput and confirmed its effectiveness in case of no network congestion. In order to accommodate many subscribers, it is also required to avoid network congestion caused by the extremely asymmetry of the access link. In this paper we describe the new TCP gateway taking account of multiple subscribers accommodated by a shared satellite access link. We also confirmed that the new gateway can accelerate TCP throughput more than 8 times avoiding network congestion.