QoS for IP-Based Satellite Network: Cross Layer Design
Sastri L. Kota, G. Giambene · 24th AIAA International Communications Satellite Systems Conference · 2006
As demand for communication connectivity anytime, anywhere, and any way increases, heterogeneous network design trend will grow faster supporting seamless integration of satellite/wired and wireless networks. Satellite communication plays a significant role in supporting next generation IP-based communication network through heterogeneous infrastructure for broadband and mobile applications. To deploy state-of-the-art satellite technologies and supporting media rich applications provisioning an end- to-end Quality of Service (QoS) and mobility must be addressed. Study of satellite communications constraints like attenuation, propagation delays, fading is very critical to support user service level agreements. Adaptive resource management, advanced modulation and coding techniques and congestion control algorithms must be developed. Transport protocols need to address the impact on end-to-end system performance due to lower layer protocols and their interaction. End-to-end QoS models and cross-layer protocol optimization must be investigated. In this paper we propose an end-to-end QoS protocol model emphasizing cross-layer optimization. In particular, we consider joint optimization of TCP and lower layer in geostationary network architecture assuming transport protocol enhancements such as TCP Reno, SACK, Westwood, and Hybla. At the physical layer modulations and coding considered include BPSK and QPSK; and Convolution Coder/Viterbi decoder. Our simulation results demonstrate that the interaction/adaptation at the physical layer improve the TCP goodput at the transport layer. Future research includes impact analysis of multimedia applications performance due to lower layer protocol selections.