Performance Analysis of TCP/IP/Q-Persistence ARQ over Satellite links

There are two general approaches to improve TCP performance in a lossy network. The first approach is to use a split-connection protocol, which provides packet recovery at the gateways. The second approach is to enhance both the physical and link layer's reliability. Automatic repeat request (ARQ) is commonly used at the link layer of wireless networks to enhance TCP performance. However, the combined TCP and ARQ approach leads to a protocol interaction problem because of the greater variability in round-trip time due to ARQ retransmission. One way to mitigate this interaction is to use a
Q
-persistent ARQ scheme, which limits the number of retransmissions to a maximum of q times, and thus places a maximum delay bound on packet delivery time. In this paper, we examine the performance of TCP with proposed g-persistent ARQ, using emulation to validate our analytical results.