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Using hybrid selection schemes to support QoS when providing multihop wireless Internet access to mobile ad hoc networks

Using hybrid selection schemes to support QoS when providing...

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International Conference on Quality of Service in Heterogeneous Wired/Wireless Networks (QSHINE)

作者： H. Ammari H. El-Rewini Mobile Computing and Parallel Processing Laboratory Computer Science and Engineering Department Southern Methodist University Dallas TX USA

The quality of service (QoS) of wireless Internet access that could be provided to multihop wireless networks, so-called mobile ad hoc networks (MANETs), is highly dependent on the quality of the design of the intermediate facility that will integrate MANET and the Internet. This facility is equipped with a hybrid mechanism being able to fulfill the working requirements of MANET and the Internet so that it can connect to either one of these orthogonal network architectures. The architecture that we propose in order to provide MANET nodes with Internet access utilizes fixed gateways (or access points) and exploits the mobility capability of additional mobile ones. Since Internet access to MANET nodes is provided through mobile gateways, the quality of such service depends on the selection procedure used by MANET nodes to choose the most convenient mobile gateways and register with. In this paper, we suggest to use a hybrid criterion based on the weighted sum of the Euclidean distance between MANET nodes and mobile gateways, and the load of mobile gateways, defined as the number of MANET nodes currently registered with them. Moreover, the sum of the weights is normalized to one, where each weight measures the level of interest of the corresponding criterion in the hybrid one. Simulation results show that the hybrid criterion has an impact on the quality of wireless Internet access service depending on the level of interest assigned to each of the Euclidean distance and load criteria in the weighted sum.

关键词： Spread spectrum communication IP networks mobile ad hoc networks Quality of service Web and internet services Routing protocols Euclidean distance Access protocols mobile computing Computer networks

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Integration of mobile ad hoc networks and the Internet using mobile gateways

Integration of mobile ad hoc networks and the Internet using...

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International Symposium on parallel and Distributed processing (IPDPS)

作者： H. Ammari H. El-Rewini Mobile Computing and Parallel Processing Laboratory Computer Science and Engineering Department School of Engineering Southern Methodist University Dallas TX USA Mobile Computing and Parallel Processing Lab Computer Science and Engineering Department School of Engineering Southern Methodist University Dallas TX USA

Summary form only given. mobile ad hoc networks (MANET) and the Internet exhibit differences in their network architecture. These differences concern the various sorts of assumptions imposed not only on the structure and topology of the underlying networks, but also on communication patterns of mobile nodes in both networks. Integrating MANET and the Internet into a hybrid network is a challenging problem due to these differences. We propose a three-layer approach that uses both mobile IP and dynamic destination-sequenced distance vector (DSDV) to integrate these two types of networks into a hybrid environment, in order to provide MANET nodes with Internet connectivity and access to the Internet resources. Our approach is based on the use of mobile gateways as an interface between MANET and the Internet. These mobile gateways can use mobile IP when they communicate with the Internet and DSDV when they interact with MANET. We also show the results of several simulation experiments that were conducted to study the integrated environment.

关键词： mobile ad hoc networks IP networks Internet mobile computing Computer networks mobile communication Routing protocols Concurrent computing parallel processing Computer science

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A multicast protocol for mobile ad hoc networks using location information

A multicast protocol for mobile ad hoc networks using locati...

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Workshop on Applications and Services in Wireless Networks, ASWN

作者： H. Ammari H. El-Rewini Mobile Computing and Parallel Processing Laboratory Computer Science and Engineering Department School of Engineering Southern Methodist University Dallas TX USA

Multicasting is a one-to-many process by wbich a node can send the same packet to a subset of nodes, called multicast group, which have already registered to the same multicast group address. The goal of this paper is to propose a multicast algorithm for mobile ad hoc networks using location information, where a multicast group is definro with respect to a specific network space area, called millticost domain. A mohile ad hoc network (MANET) is a set of nodes that agrero upon fonning a spontaneous, temporar y network so that they can communicate over wireless Iinks despite the lack of any centraIized administration and any fonn or infrastructure. The proposed algorithm benefits from the location-oriented service offered by a glohal positioning system (GPS), which provides MANET nodes (or nodes for short) with their location information when needed. Moreover, the protocol makes use of the Vorono; diagram properties in order to multicast a packet in a selective manner towards its target multicast dOmain, where ouly a small subset of nodes is involved in the forwarding process. These nodes, called authorized forwarders, are identified from the *** Voronoi graph that a multicast source node or an authorized forwarder constructs based on the location infonnation of its neighborhood as well as the target multicast domain. The analysis bas shown that fhe protocol helps minimize the transmission overhead, which would be caused during the forwarding of a multicast packet, while guaranteeing convergence and correctness. Compared to other existing location-based multicast protocols, the proposed one yields more reduction of transmission overhead and perfonns correctly even with particular MANET topologies. Keywords - Multicasting, mobile ad hoc networks, locationbased service, Voronoi diagmms, global positioning system.

关键词： Multicast protocols mobile ad hoc networks Routing protocols Multicast algorithms Network topology mobile computing Computer networks Concurrent computing parallel processing Laboratories

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