Hierarchical cache design for enhancing TCP over heterogeneous networks with wired and wireless links

Abstract

In this paper, we propose a two-layer hierarchical cache architecture for enhancing TCP performance over heterogeneous networks with both wired and wireless links. A new network-layer protocol, called New Snoop, is designed. The main idea is to cache the unacknowledged packets at both Mobile Switch Center (MSC) and Base Station (BS), thus forming a two-layer cache hierarchy. If a packet is lost due to transmission errors in wireless link, the BS takes the responsibility to recover the loss. When a handoff occurs during a TCP connection session, the packets cached in MSC can help to minimize the latency of retransmissions due to temporal disconnection. Simulation results show that using New Snoop is significantly more robust in dealing with unreliable wireless links and handoffs as compared with the Snoop scheme as well as other existing TCP enhancements.