Throughput Improvement of MPTCP by Selective Bicasting with Cross-Layer Control in Wireless Environment
Masami Fukuyama, Nariyoshi Yamai, Satoshi Ohzahata, Naoya Kitagawa · 2018
A mobile device equipped with multiple wireless network interfaces has capability to improve throughput and availability by means of Multipath TCP (MPTCP) communication with alternating the primary (active) interface according to the current wireless network condition. To realize this ability, we proposed MPTCP selective bicasting which bicasts only retransmission request packets and retransmission packets. However, this method as a problem that it would not improve throughput so much when the condition of wireless communication deteriorates since it bicasts packets only after the transport layer detects packet losses. In this paper, we propose a method to improve throughput which bicasts packets before the transport layer detects packet losses by means of cross-layer control. Based on the frame loss rate in the data link layer, this method sends dropping packets via the alternative interface earlier than the previous method. Simulation results shows that the proposed method improves throughput without sending so many packets via the alternative interface.