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When stricken by a large-scale disaster, the efficiency of disaster response operation is very critical to lifesaving. However, communication systems, such as cellular networks, usually crashed due to various causes making coordination among disorganized disaster responders extremely difficult. Unfortunately, rapid deployment of many existing emergency communication systems relies on a good transportation...
This paper considers a hybrid cellular architecture in which mobiles can communicate with others in their vicinity, e.g. using 802.11 interface, in addition to the base stations of the cellular network. Such an architecture can aid device-to-device communication as well as assist critical tasks of cellular networks such as mobility management, content caching and relaying. In order to enable these...
MANET is formed by mobile nodes that have limited battery and CPU power. Since there are no dedicated routers, every mobile node is expected to route (or relay) packets on behalf of other nodes. This is true irrespective of the routing protocols they use in the network. Due non-deterministic nature of the network topology, some nodes are expected to route more packets than other nodes. Nodes that...
In multi-hop wireless networks, the way the network topology is defined has a strong impact on routing. This paper deals with topology control in cellular networks with relays. Several topology control algorithms taken from ad-hoc networks are adapted to cellular networks. Most of the algorithms considered here are based on proximity graphs. Performance analysis is carried out in a realistic scenario...
In this paper, we evaluate the features and limitations of Tiny OS mote simulator (TOSSIM), the sensor network simulator in TinyOS systems. The focus is on the applicability of TOSSIM for intelligent home research. As a part of the research work, we designed and implemented a simple sensor network that can be used in a virtual intelligent home. Our conclusions are based on the tests performed with...
Aquatic environment monitoring plays an important role in the artificial breeding of marine shellfish. Wireless sensor network (WSN) is an efficient approach for monitoring large-scale coastal beach with densely distributed smart nodes. Combined with a project of aquatic environment monitoring and assessment of marine shellfish in Zhejiang province, China, a new structure of WSN combining network...
Topology control and energy saving is one of the most important challenges in wireless ad hoc sensor networks. There are two approaches for conserve energy in topology control algorithms. First by adjusting a node??s transmission power and second manipulating a node??s state. In this paper, multi-state k-fault tolerant topology control algorithm is presented using clustering technique to manage k...
We study the impact of the distribution of node locations on key properties of wireless networks. In particular, using Monte Carlo simulations we study in detail the behavior of average path length for different distributions and parameters thereof. We also show that distribution of client locations has significant impact on network planning, in particular on combination of base station placement...
This paper proposes adapting dynamic network topology to match changing quality of service requirements in real-time wireless broadband networks. Based on modelling and drive tests, thresholds ensuring the quality of links for specified services are established. A method for matching network topologies according to link quality and capacity to IP services is presented. A service link quality matrix...
The multi-scenario of the topology in the hybrid ad hoc networks is studied and a novel cross layer resource scheduling scheme based on the topology is proposed in this paper. The proposed scheme integrated the attributes both of the new performance evaluation machine link resource check metric (MLRCM) and the topology space with the special multi-scenario. The power consumption of each node can be...
Target tracking application in WSN should solve the problem of target status sharing well. To overcome the shortages of DCTC and cluster-based method, method using connected dominating set based aggregation tree is introduced. According to whether node has the capability of locating, target status information can be shared in aggregation tree by broadcast or unicast. Because of the structure stability...
An infrastructure relay system that transfers information from a base station to a randomly located mobile station (MS) using fixed-location relay stations (RSs) is studied. Transmission rates are derived for serial, parallel, and hybrid relay transmissions, considering the utilization of RSs as a means to extend the dimensionality of a multiple-input-multiple-output (MIMO) transmission. The derived...
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