Prabhavat, Sumet

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Prabhavat, Sumet
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Prabhavat, S.
Prapawat, Sumet
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sumet.pr@kmitl.ac.th

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    Item type:Publication,
    Global-Scale Flow Routing for Load-Balancing in In-Band Software-Defined MANET
    (2025-01-01)
    Thongthavorn, Thananop
    ;
    Prabhavat, Sumet
    Mobile Ad Hoc Networks (MANETs) typically operate with limited resources; therefore, achieving better load distribution among mobile nodes can significantly enhance network performance by improving resource utilization. In distributed load-balancing protocols, a lack of global network topology information causes source nodes to make load-balancing routing decisions without awareness of other active paths. As a result, overlapping paths from different source nodes tend to be formed, increasing network congestion and packet collision probability, which ultimately degrades network performance. A Software-Defined MANET (SD-MANET) is a promising solution to this problem since the controller can make a routing decision for source nodes based on up-to-date network topology snapshots. In this paper, we propose a global-scale flow routing algorithm based on an in-band SD-MANET architecture. Once the controller aggregates local network data into a global topology view, it can identify a path that avoids using any nodes currently serving as a relay in other active paths. The controller then establishes or switches the active flow to the new route depending on the current network situation. Simulation results show that our proposed work can effectively reduce the number of overlapping paths, resulting in lower load balancing errors and a higher packet delivery ratio.
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    A new explicit congestion notification scheme for satellite IP networks
    (2016-11-01)
    Utsumi, Satoshi
    ;
    Zabir, Salahuddin Muhammad Salim
    ;
    Prabhavat, Sumet
    Longer transmission delay and higher link errors affect data communication performance over satellite links. The problem gets compounded in case a congestion occurs in the corresponding data path. Taking preventive measures before a congestion actually occurs can help in avoiding such situations. Irrespective of the network characteristics, Explicit Congestion Notification (ECN) either through ICMP messages or through marking packets aims to achieve this objective. However, use of ICMP messages for explicit congestion notification leads to vulnerability to attacks by malicious hosts. On the other hand, use of conventional marking schemes that mark data packets in the forward direction can be slow as they have to traverse the satellite links. In this manuscript, we propose a new mechanism of ECN for an even faster notification of an incipient congestion over satellite IP networks. Our proposal, Mark-Reverse ECN, marks packets corresponding to acknowledgement (ACK) segments in the reverse direction to the sender. This leads to a reduction of the latency between detection and actual notification. As such, our mechanism leads to a more accurate and effective approach to congestion control. In addition, our proposed mechanism is free from vulnerability to malicious attacks. We also develop a new analytical model for Mark-Reverse ECN on TCP Reno for performance prediction and validation of simulation outcomes. Simulation results show that our proposed mechanism (i) leads to up to 25% improvement of TCP performance, (ii) reduces packet loss at the congested router by down to about 0% and (iii) helps to improve the performance of conventional TCP when deployed together.
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    Item type:Publication,
    Low overhead localized routing in mobile Ad Hoc networks
    (2019-01-01)
    Prabhavat, Sumet
    ;
    Narongkhachavana, Worrawat
    ;
    Thongthavorn, Thananop
    ;
    Phankaew, Chanakan
    Mobile Opportunistic Networks (OppNets) are infrastructure-less networks consisting of wireless mobile nodes and have been a focus of research for years. OppNets can be scaled up to support rapid growth of wireless devices and technologies, especially smartphones and tablets. Mobile Ad Hoc Networks (MANETs), one of OppNets technologies, have a high potential to be used for facilitating an extension for the Internet and a backup communication platform in disaster situation. However, a connection disruption due to node mobility and unreliable wireless links is possible to trigger a flooding operation of route repair process. This results in transmission delay and packet loss. The flooding of routing packets is an expensive operation cost in MANETs which affects network reliability and wastes limited resources such as network bandwidth and node energy. These are obstacles to practical implementation of MANETs in real-world environment. In this paper, we propose Low Overhead Localized Flooding (LOLF), an efficient overhead reduction routing extension based on Query Localization (QL) routing protocol. The purpose of this work is to control the propagation of routing packets in the route discovery and route repair mechanisms while incurring only a small increase in the size of control information in the packet. Simulation results from extensive experiments show that our proposed method can reduce overall routing overhead, energy consumption, and end-to-end delay without sacrificing the packet delivery ratio compared to existing protocols.
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    Item type:Publication,
    On load distribution over multipath networks
    (2012-01-01)
    Prabhavat, Sumet
    ;
    Nishiyama, Hiroki
    ;
    Ansari, Nirwan
    ;
    Kato, Nei
    Efficient utilization of network resources, provided by multiple interfaces available on today devices, is critical in facilitating parallel connections through multiple paths. Load distribution strategies in using multiple interfaces for simultaneous data transmission have been studied. This paper presents a thorough literature review of various existing load distribution models, and classifies them in terms of their key functionalities such as traffic splitting and path selection. Based on a number of significant criteria such as the ability to balance load and to maintain packet ordering, along with several other issues, which affect network performance perceived by users, we analyze various examples of existing models, and then compare and identify their exhibited advantages as well as shortcomings. © 2012 IEEE.