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Author: search.filters.author.Prabhavat, SumetSubject: search.filters.subject.MANETs

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    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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    Integration of MANET with In-Band SDN Controller
    (2021-01-01)
    Thongthavorn, Thananop
    ;
    Prabhavat, Sumet
    Mobile Ad Hoc Networks (MANETs) are Infrastructureless mobile networks that can be formed with a group of wireless devices. To establish communication, MANETs require a routing protocol to discover an end-to-end route under uncertain network topology due to node mobility. The traditional reactive routing protocol discovers the shortest route using only the node’s local information and keeps utilizing the route until it collapses. This kind of method might not conform to the recent network condition. In this paper, we propose an SDN- based routing protocol for MANETs. By assigning a node in the network to act as an SDN controller, the route discovery action will be centralized. Since the SDN controller is not designed to support multi-hop wireless communication, we additionally design a mechanism to maintain connectivity between the controller and mobile nodes. The controller utilizes link-state information of every node to decide a route upon request. The simulation result shows that the proposed protocol overcomes the aforementioned routing problem. The generated route requests are decreased which indicating an increase in route stability, resulting in a better packet delivery ratio.
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    Adaptive gateway discovery for load distribution in hybrid wireless networks
    (2018-07-02)
    Thongthavorn, Thananop
    ;
    Narongkhachavana, Worrawat
    ;
    Namuduri, Kamesh
    ;
    Prabhavat, Sumet
    Mobile Ad hoc Networks (MANETs) have a limitation in information transmission capability since nodes in the network cannot communicate with any nodes in another network. Hybrid Wireless Networks (HWNs) is proposed for connecting MANETs to another network through gateway nodes that act as a bridge between the networks. Limited energy resource to HWNs is a challenging issue. If a source node selects a gateway and a route to it without considering the available energy of relay nodes, the probability of route breakage may increase leading to network instability and network partition problem. In order to mitigate these problems, an effective load balancing algorithm should be applied to HWNs. In this paper, we propose an adaptive gateway discovery algorithm aimed to create a well-balanced network. We also propose using a directional flooding technique to alleviate the drawback of load balancing information flood. Simulation results show that our protocol distributes the workload to mobile nodes more evenly. As a result, our protocol further extends the network lifetime without sacrificing the network performance when compared to the existing protocols.