Cross-layer speculative architecture for end systems and gateways in computer networks with lossy links

• Published in: Wireless networks Vol. 16; no. 6; pp. 1621 - 1638
• Main Authors: Bai, Haowei, Lilja, David J., Atiquzzaman, Mohammed
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-08-2010; Springer Nature B.V
• Subjects: Accuracy; Communications Engineering; Computer architecture; Computer Communication Networks; Computer networks; Control algorithms; Corruption; Degradation; Electrical Engineering; Engineering; Internet Protocol; IP (Internet Protocol); IT in Business; Links; Mathematical models; Microprocessors; Middleware; Networks; Performance evaluation; Simulation; Studies; TCP (protocol); TCP-IP; TCP/IP (protocol); Transport; Wireless networks; Network architecture; wireless networks; Transport control protocol (TCP); Speculative execution
• ISSN: 1022-0038; 1572-8196
• DOI: 10.1007/s11276-009-0218-6

The throughput degradation of Transport Control Protocol (TCP)/Internet Protocol (IP) networks over lossy links due to the coexistence of congestion losses and link corruption losses is very similar to the degradation of processor performance (i.e., cycle per instruction) due to control hazards in computer design. First, two types of loss events in networks with lossy links are analogous to two possibilities of a branching result in computers (taken vs. not taken). Secondly, both problems result in performance degradations in their applications, i.e., penalties (in clock cycles) in a processor, and throughput degradation (in bits per second) in a TCP/IP network. This has motivated us to apply speculative techniques (i.e., speculating on the outcome of branch predictions), used to overcome control dependencies in a processor, for throughput improvements when lossy links are involved in TCP/IP connections. The
objective
of this paper is to propose a cross-layer network architecture to improve the network throughput over lossy links. The system consists of protocol-level speculation based algorithms at transport layer, and protocol enhancements at middleware and network layers that provide control and performance parameters to transport layer functions. Simulation results show that, compared with prior research, our proposed system is effective in improving network throughput over lossy links, capable of handling incorrect speculations, fair for other competing flows, backward compatible with legacy networks, and relatively easy to implement.