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Two key components contribute to task completion time: execution cost and communication cost. The communication cost is induced by data transfers from one task to another residing on separate nodes. To reduce communication cost, interdependent tasks are allocated to closely located nodes. However, once tasks are allocated, nodes can move within a Grid. The node mobility within a Grid can increase...
Ad hoc networks are useful for providing communication support where no fixed infrastructure exists or the deployment of a fixed infrastructure is not economically profitable, and movement of communicating parties are allowed. Due to the dynamic topology, developing better routing protocol became a challenging task. The Dynamic Source Routing (DSR) protocol is a simple and efficient routing protocol...
Ad hoc networks (AHNs) include mobile nodes with limited communication resources on which the path selection is usually made according to a best effort strategy. Today, AHNs are facing a new challenge: a resources reservation mechanism oriented quality of service. The importance of this challenge makes this issue focused by several researchers. In this paper we propose a flexible QoS reservation mechanism...
Mobile Ad hoc Networks (MANET) are wireless networks consisting of a collection of mobile nodes with no fixed infrastructure. Due to their decentralized, self-configuring and dynamic nature, MANETs offer many advantages and are easy to install. But with this dynamic topology, mobile ad hoc networks have some challenges like the design of an efficient routing protocol. An example for this challenge...
One of the most critical problems in multihop wireless networks is the fair allocation of bandwidth among different nodes. Although there are significant researches on the fairness issues in single-hop wireless networks, research on multihop fairness rarely found in the literature. A user in multi-hop network, besides the contention with other nodes to obtain the channel in physical layer, must find...
Wireless mesh networks (WMNs) are developing as a potential solution for growing wireless applications. As the area is new, there are many basic issues still to be solved. This article investigates applicability of the ad-hoc routing protocols and the suitability of existing routing metrics for WMNs. AODV is enhanced by proposing a new hybrid routing metric. The results show that selected path is...
Due to technology or policy constraints, communications across network domains usually require the intervention of gateways, and their proper deployment is crucial to the overall performance. In this paper, we study the problem of placing static gateways in mobile DTNs consisting of multiple domains. Given a limited gateway budget, the problem is to select deployment locations to optimize certain...
We consider a simple ad-hoc cognitive scenario with two data up-links, one licensed to use the spectral resource (primary) and the other unlicensed (secondary or cognitive). It is assumed that the cognitive link accesses the channel only when the channel is sensed idle. An ON-OFF channel model is used for the primary link, where traffic statistical characteristics are taken into account. A closed-form...
We consider the use of a novel load balancing-aware routing algorithm for multipath wireless sensor networks. Focusing on solutions that minimize end-to-end delay, we optimize resource usage in mobile nodes. An analytical model is provided for flow-level multipath routing design; we then proceed to simplify the model for more practicality while retaining much of the original functionality. The practical...
This paper studies the problem of congestion control and scheduling in ad hoc wireless networks that have to support a mixture of best-effort and real-time traffic. Optimization and stochastic network theory have been successful in designing architectures for fair resource allocation to meet long-term throughput demands. However, to the best of our knowledge, strict packet delay deadlines were not...
In ad hoc networks, when the load is heavy, the performance of on-demand routing protocols, such as DSR protocol, will suffer large degradation. For instance, the absence of balanced distribution of network flow among nodes in the whole network is highly prone to producing heavy-load key nodes. This results in fast energy consumption of these key nodes, and finally decreasing the survival time of...
Congestion, the major reason for a link break is caused due to excessive load on the network, further leads to failure of nodes and topology change in the ad-hoc network. Transferring load of congested route to less congested routes improves overall network performance. Adhoc On-Demand Multipath Distance Vector (AOMDV) selects a path with a lower hop count and discards routes with higher hop count...
After decades of wired communication, the wireless communication has replaced them in the recent past. Due to the large bandwidth of wireless communication, it is used for multimedia applications. The wireless multimedia network has gained tremendous importance in recent years due to its wide applications. It is unreliable because of network parameter constraints such as bandwidth, buffer, delay,...
We propose a game-theoretic framework for quality-of-service (QoS) aware resource competition among coexisting wireless links in mobile wireless networks. The senders of wireless links use the constant transmit power and then the wireless resources of interest is characterized by time-slot length. Multiple wireless links will use the limited wireless resources through a time-slot competition game...
The standard way to handle frequent transmission errors over wireless links is to use a link-layer automatic retransmission mechanisms. However, multiple retransmissions per link along an n-hop path leads to significant channel usage inefficiency and poor end-to-end performance. We propose a novel cooperative diversity based multi-copy relaying (CDMR) scheme for wireless mesh networks. CDMR improves...
Inefficient resource management may cause problems of reliability of service in shared medium wireless networks. Resources include bandwidth, processor cycles and buffers. Excessive competition for these resources can cause severe packet collision rates, compound network congestion, or even result in starvation of some nodes. In such a situation, data transmission is subject to very long delays and...
Battery energy limitation is one of the main challenges in the mobile ad hoc networks. Several hardware and software based techniques have been proposed in this field. Energy aware task scheduling is one of the software methods where the scheduling policy aims at optimizing the energy. Most of the previous work have achieved significant energy savings for individual mobile nodes but did not consider...
Nodes in ad hoc networks can be unfairly burdened to support many packet-relaying functions, resulting in excessive loads on these hot spots. This load on nodes appears in two major aspects: traffic and power consumption. Unbalanced traffic may lead to more delay, packet dropping, and decreasing packet delivery ratio (PDR). Unbalanced energy consumption leads to node failure, network partitioning...
The quality of service, in networks, aims at improving communication behavior under a correct data transmission and an optimal use of resources. It is the degree of users' satisfaction of services that a communication system provides. In this connection, the quality of service in multi-hop networks, including MANETs, poses various problems than in wired networks. It requires that the network complies...
The performance of networks is generally estimated through characteristic indices such as delivery ratio, latency, delay, jitter and loss. Such indices depend on network parameters such as TTL, buffer size, time and load which are at times highly correlated. Factors impacting network measurements include cross traffic, architectures of intermediate nodes, complex interaction of hardware resources...
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