733 research outputs found
A Survey on Congestion Control and Scheduling for Multipath TCP: Machine Learning vs Classical Approaches
Multipath TCP (MPTCP) has been widely used as an efficient way for
communication in many applications. Data centers, smartphones, and network
operators use MPTCP to balance the traffic in a network efficiently. MPTCP is
an extension of TCP (Transmission Control Protocol), which provides multiple
paths, leading to higher throughput and low latency. Although MPTCP has shown
better performance than TCP in many applications, it has its own challenges.
The network can become congested due to heavy traffic in the multiple paths
(subflows) if the subflow rates are not determined correctly. Moreover,
communication latency can occur if the packets are not scheduled correctly
between the subflows. This paper reviews techniques to solve the
above-mentioned problems based on two main approaches; non data-driven
(classical) and data-driven (Machine Learning) approaches. This paper compares
these two approaches and highlights their strengths and weaknesses with a view
to motivating future researchers in this exciting area of machine learning for
communications. This paper also provides details on the simulation of MPTCP and
its implementations in real environments.Comment: 13 pages, 7 figure
Reducing Transport Latency for Short Flows with Multipath TCP
Multipath TCP (MPTCP) has been an emerging transport protocol that provides network resilience to failures and improves throughput by splitting a data stream into multiple subflows across all the available multiple paths. While MPTCP is generally beneficial for throughput-sensitive large flows with large number of subflows, it may be harmful for latency-sensitive small flows. MPTCP assigns each subflow a congestion window, making short flows susceptible to timeout when a flow only contains a few packets. This condition becomes even worse when the paths have heterogeneous characteristics as packet reordering occurs and the slow paths can be used with MPTCP, causing the increased end-to-end delay and the lower application Goodput. Thus, it is important to choose the appropriate subflows for each MPTCP connection to achieve the good performance. However, the subflows in MPTCP are determined before a connection is established, and they usually remain unchanged during the lifetime of that connection. To address this issue, we propose DMPTCP, which dynamically adjusts the subflows according to application workloads. Specifically, DMPTCP first utilizes the idea of TCP modeling to estimate the latency on the path under scheduling and the data amount sent on the other paths simultaneously, and then decides the set of subflows to be used for certain application periodically with the goal of reducing completion time for short flows and achieving a higher throughput for long flows. We implement DMPTCP in a Linux server and conduct extensive experiments both in NS3 and in Linux testbed to validate its effectiveness. Our evaluation shows that DMPTCP decreases the completion time by over 46.55% compared to conventional MPTCP for short flows while increases the Goodput up to 21.3% for long-lived flows
A Performance Analysis Model of TCP over Multiple Heterogeneous Paths for 5G Mobile Services
Driven by the primary requirement of emerging 5G mobile services, the demand
for concurrent multipath transfer (CMT) is still prominent. Yet, multipath
transport protocols are not widely adopted and TCP-based CMT schemes will still
be in dominant position in 5G. However, the performance of TCP flow transferred
over multiple heterogeneous paths is prone to the link quality asymmetry, the
extent of which was revealed to be significant by our field investigation. In
this paper, we present a performance analysis model for TCP over multiple
heterogeneous paths in 5G scenarios, where both bandwidth and delay asymmetry
are taken into consideration. The evaluation adopting parameters from field
investigation shows that the proposed model can achieve high accuracy in
practical environments. Some interesting inferences can be drawn from the
proposed model, such as the dominant factor that affect the performance of TCP
over heterogeneous networks, and the criteria of determining the appropriate
number of links to be used under different circumstances of path heterogeneity.
Thus, the proposed model can provide a guidance to the design of TCP-based CMT
solutions for 5G mobile services
Reducing Transport Latency for Short Flows with Multipath TCP
Multipath TCP (MPTCP) has been an emerging transport protocol that provides network resilience to failures and improves throughput by splitting a data stream into multiple subflows across all the available multiple paths. While MPTCP is generally beneficial for throughput-sensitive large flows with large number of subflows, it may be harmful for latency-sensitive small flows. MPTCP assigns each subflow a congestion window, making short flows susceptible to timeout when a flow only contains a few packets. This condition becomes even worse when the paths have heterogeneous characteristics as packet reordering occurs and the slow paths can be used with MPTCP, causing the increased end-to-end delay and the lower application Goodput. Thus, it is important to choose the appropriate subflows for each MPTCP connection to achieve the good performance. However, the subflows in MPTCP are determined before a connection is established, and they usually remain unchanged during the lifetime of that connection. To address this issue, we propose DMPTCP, which dynamically adjusts the subflows according to application workloads. Specifically, DMPTCP first utilizes the idea of TCP modeling to estimate the latency on the path under scheduling and the data amount sent on the other paths simultaneously, and then decides the set of subflows to be used for certain application periodically with the goal of reducing completion time for short flows and achieving a higher throughput for long flows. We implement DMPTCP in a Linux server and conduct extensive experiments both in NS3 and in Linux testbed to validate its effectiveness. Our evaluation shows that DMPTCP decreases the completion time by over 46.55% compared to conventional MPTCP for short flows while increases the Goodput up to 21.3% for long-lived flows
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