CodeMP: Network coded multipath to support TCP in disruptive MANETs

Abstract

TCP over Mobile Ad-hoc Networks (MANETs) is challenging due to frequent route breaks, high random errors, and DATA-ACK interference. Network coded multipath approaches have been shown in several previous studies to be an effective transmission paradigms in disruptive networks. However, most of the previous studies either have no adaptive redundancy control or rely on theoretical models that require knowledge at all relays of the entire network state. In this paper, we propose a network coded multipath scheme for conventional TCP-CodeMP-that adapts to frequent link changes in MANET and requires no explicit control messages. The scheme exploits multiple-path redundancy and maintains total transparency to transport layer protocols. The proposed coding scheme is based on three components: (1) random linear coding scheme with adjustable redundancy, (2) multipath routing, (3) ACK Piggy coding. Simulation results show that in a 3-hop static scenario, the proposed multipath scheme improves TCP flows goodput by 70% compared to our previous single-path scheme. In an extreme MANET scenario where two TCP sessions co-exists and nodes are moving as fast as 25 m/s with up to 40% packet error rate (an environment in which regular TCP collapses completely), CodeMP achieves at least 700Kbps aggregate TCP goodput, with a Jain's fairness index of 0.99.

Network-coded internet-friendly transport protocol

“…Wu et al 14 are interested in network coding for wireless multicast. Li et al 15 integrated network coding into multipath TCP to boost the overall goodput, while Chen et al 16 proposed a network-coded multipath protocol to support TCP in disruptive MANETs. Montpetit and Medard 17 reviewed recent networking developments that will help create the next-generation social television and suggested using network coding to improve the quality of experience.…”

Network Coding for Severe Packet Reordering in Multihop Wireless Networks

“…Besides these, there are other approaches to address the TCP performance problem in coded networks. Reference [15] proposes a network coded multipath scheme called CodeMP to improve TCP performance in disruptive MANETs. CodeMP uses ACK Piggy coding to mitigate self-interference due to contention for a shared wireless channel between TCP data and its ACKs.…”

Content distribution in VANETs

“…Naturally, the LTE connection can itself be noisy and lossy, causing problems with TCP window mechanism. A possible solution is to use network coding to strengthen the connection (via adaptive redundancy) and make it more robust to losses [7].…”