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The Hierarchical Optimized Link State Routing (HOLSR) protocol was designed to improve scalability of heterogeneous Mobile Ad-Hoc Networks (MANETs). HOLSR is derived from the OLSR protocol and implements Multipoint Relay (MPR) nodes as a flooding mechanism for distributing control information. Unlike OLSR, nodes are organized in clusters and implement Hierarchical Topology Control (HTC) messages for...
Wireless Mesh Networks aim to provide high-bandwidth broadband connections to a large community and thus, should be able to accommodate a large number of users accessing the Internet. Due to high estimated traffic volume in Wireless Mesh Networks, scalability and fault tolerance become important requirements in algorithm design. We propose a Failure Recovery Mechanism (FRM) for the channel assignment...
In this paper, we try to reduce the amount of control traffic of the optimized link state routing protocol (OLSR). OLSR is a proactive routing protocol for mobile ad-hoc networks (MANETs). OLSR is known well as a low control traffic routing protocol, since it adopts multipoint relays (MPRs). MPRs concept significantly reduces the number of broadcast messages during the flooding process. Although MPR...
In order to facilitate communication among the active stations on a mobile ad-hoc network (MANET), a routing protocol is used to discover routes between stations. It plays an important role for the overall performance of a MANET. There are factors such as mobility, network size, network load, bandwidth, and signal strength affecting the performance of routing protocols. This paper aims to study the...
In this work we present a model to simulate high traffic load using Manet. The Manet topology is studied in three different scenarios with different loads and the minimal capacities for wireless connection between cluster heads, among nodes with corresponding cluster heads, and the minimal capacity for a node to become a cluster head is attained in order to assure the network function. The problem...
This paper studies the connectivity of large cooperative ad hoc networks. Unlike existing work where all nodes are assumed to transmit cooperatively, the cooperative network we consider is realistic as we assume that not all nodes are willing to collaborate when relaying other nodes' traffic. For such selfish, cooperative network, we use stochastic geometry and percolation theory to analyze the connectivity...
While the problem of greedy behavior at the MAC layer has been widely explored in the context of wireless local area networks, its study for multi-hop wireless networks still almost an unexplored and unexplained problem. Indeed, in a wireless local area network, an access point mostly forwards packets sent by wireless nodes over the wired link. In this case, a greedy node can easily get more bandwidth...
Routing in mobile ad hoc networks (MANETs) is central to their proper functioning. Mobility in such networks makes the routing a real challenging task. Routes validity plays a central leveraging mission to enhance network performances. Forwarding through incorrect routes not only results in traffic wandering inside the network without ever being able to be delivered to their ultimate destinations...
Certificate validation based on PKIX protocols does not work well under the particular conditions found in a MANET: Episodic connectivity and low bandwidth. We propose an overlay network of validation proxy servers which exploit cooperative caching of recent validation results. The proxy overlay improves the availability of the validation service and reduces the network traffic. The design employs...
The challenges of optimal flooding of network control messages in mobile ad-hoc network (MANET) have been well studied in the literature [2]-[10] and [12]-[19]. A particular case of this problem is encountered in MANET routing protocols, which need to distribute routing control information to all member nodes as efficiently as possible. While both proactive and reactive MANET routing protocols exist,...
In this paper, we modify and extend epidemic routing used in intermittent networks such as delay tolerant networks (DTNs). In particular, we propose to include immunity-based information disseminated in the reverse direction once messages get delivered to their destination. There are many variants of epidemic routing that are intended to result in better resource utilization by reducing the number...
To support energy-efficient routing, accurate state information about energy level should be available. But due to bandwidth constraints, communication costs, high loss rate and the dynamic topology of MANETs, collecting and maintaining up-to-date state information is a non-trivial task. In this work, we use Optimized Link State Routing (OLSR) as the underlying routing protocol and focus on residual...
This paper explores the power saving technique for multi-hop ad-hoc wireless networks that reduces energy consumption without significantly diminishing the capacity or connectivity of the network. EEN (Energy Efficient Network) builds on the corrective observation of Power saving network when a region of multi shared-channel wireless network has a sufficient density of nodes, only a small number of...
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