Packet Loss Differentiation of TCP over Mobile Ad Hoc Network Using Queue Usage Estimation
the main deficiency of standard TCP and all existing variations in ad hoc mobile network arises in its inability to classify packet losses. Conventional TCP diagnoses all losses due to congestion since noncongestion losses are rare and ignorable in wired network. However, these losses are generated frequently in MANET due to signal attenuation, interference and nodes mobility. In order to prevent TCP form invoking congestion control over noncongestion loss and vice versa, Packet loss classification with high accuracy is desirable. This paper proposes an end-to-end sender-side approach which aims to classify congestion loss, wireless channel loss and link failure loss using queue usage estimation. Relative One-way Trip Time is key factor in calculating queue usage. Packet losses with queue usage rate greater than predefined threshold is always interpreted as congestion loss no matter how loss recognized. However, queue usage less than threshold signify presence of non-congestion losses. Non-congestion loss which recognized by three duplicate ack labels loss due to wireless channel error since it is indication of route existence between communicating end point that duplicate ACKs moved along. However Non-congestion loss which recognized after retransmission timer expiration has been probably due to link failure. Different approaches efficiency are evaluatedbased on loss classifications accuracy under different conditions such as various flow numbers, various wireless loss rates and variable speed for nodes. Simulations illustrate that obtained accuracy of enhanced scheme is the highest among proposed methods.
loss classification MANET
Mohammad Amin Kheirandish Fard Sasan Karamizadeh Mohammad Aflaki
Department of Computer system and Communication, Universiti Teknotogi Malaysia Faculty of engineering, Multi Media University, Cyberjaya, Selangor, Malaysia
国际会议
西安
英文
606-610
2011-05-27（万方平台首次上网日期，不代表论文的发表时间）