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The handoff decision among heterogeneous wireless networks is a very important issue for integrating WLANs and cellular networks. Such networks exhibit different characteristics with respect to bandwidth, latency, power, and their charge model as well. In this paper, we present extensive numerical simulations of a novel vertical handover mechanism, which we proposed recently. We compare our mechanism...
This paper introduces a novel architecture for mobile communication networks with guaranteed quality of service. For comparison purposes, performance upperbounds of the whole system are derived subsequently. Their numerical evaluation in real-life simulation scenarios shows that our proposal significantly outperforms the state-of-the-art IEEE 802.11 technology in random topologies with varying traffic...
The adaptive network selection, efficient resource management, call admission control (CAC) strategies in mobile WiMAX must consider the characteristic of multi-rate to reduce the call blocking probability (CBP) and call dropping probability (CDP). In this paper, we propose a hierarchical network selection strategy (HNSS) based on grey relational analysis (GRA) to switch to the proper base station...
The next generation cellular wireless network is expected to provide a broad range of multimedia services, where the traffic asymmetry between uplink and downlink is significant. The code division multiple access system with time division duplex mode (TDD-CDMA), adopting unbalanced slot allocation between uplink and downlink, is a good solution for this traffic asymmetry. Here a QoS adaptive multimedia...
One of the basic problems in maritime tactical networks is how to maximize the quality of service (QoS) achieved by critical traffic while dealing with mobile and limited-capacity links. This paper describes an evaluation of the resource reservation service (RRS), a distributed admission control protocol designed to guarantee end-to-end bandwidth for critical traffic in the maritime environment. The...
An ad hoc network is a collection of wireless mobile nodes dynamically forming a temporary network without the use of any existing network infrastructure or centralized administration. A number of routing protocols like dynamic source routing (DSR), ad hoc on-demand distance vector routing (AODV), destination-sequenced distance-vector (DSDV) and temporally ordered routing algorithm (TORA) have been...
Due to the bandwidth constraint and dynamic topology of mobile ad hoc networks, supporting QoS becomes a multi-constrained QoS routing problem for mobile ad hoc networks. This paper proposes an improved ant colony QoS routing algorithm (IAQR) for ad hoc networks. The IAQR algorithm introduces a routing modeling with four QoS constrained requirements associated with nodes or links, and defines four...
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