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Plant automation and control are mission-critical applications and require timely and reliable data delivery, which is difficult to provide using a wireless technology. This is especially more difficult in industrial environments with harsh radio conditions. In this paper we present a dynamic and distributed topology control algorithm for Wireless Sensor Networks for use in performance critical environments...
Ever increasing demand for more bandwidth over the Internet has lead to the development of many new technologies and architectures. Among these, Hybrid of Wireless and Optical networks have become increasingly important because of their “mobility” and “flexibility” in the wireless part and “robustness” and “high capacity”...
Current trends in applications, services and socializing increase demands for network infrastructures, capable of supporting real-time traffic and Quality of Service (QoS). In this work, we aim at improving the inherently stringent wireless multi-hop network structure, based on the notion of inverse Topology Control (iTC). Taking into account socially-induced network churn operations, we focus on...
Doing research on mobile ad hoc network (MANET) security involves several constraints, some of which are wireless environment's attributes, such as bandwidth and delay, and the correctness of network topology. Testing and evaluating using real wireless devices are costly and somehow impractical, so many tools have been developed in order to create media by which researchers can deeply investigate...
A micro-power wireless communication method for local detection and control, which has been awarded two invention patents by State Intellectual Property Office of the People's Republic of China(Patent No. : ZL200510041064.7 ; No : ZL200710162785.2), includes forming star topological dynamic tree structure by setting relay with each node using micro-power to emit and receive signal, using time delay...
Against large overhead of routing discovery and change of topology in Wireless Mesh network, a new node-disjoint multi-path routing algorithm of wireless Mesh network - NDOUTE is proposed. This algorithm is based on AOMDV, introducing the source route ideas of DSR. The new addition of “source routing sequence” and “broadcasting node table” in RREQ, RREP packet avoids the reverse routing loop, provides...
Intrinsic restrictions of sensor nodes and unreliable nature of wireless communication direct the designers to develop power efficient and resource utilizing protocols for wireless sensor networks (WSNs). Different types of energy-efficient protocols have been proposed based on different topologies. In this paper we address the issue of logical topology of WSNs in conserving energy and efficient utilization...
When supporting both voice and TCP in a wireless multihop network, there are two conflicting goals: to protect the VoIP traffic, and to completely utilize the remaining capacity for TCP. We investigate the interaction between these two popular categories of traffic and find that conventional solution approaches, such as enhanced TCP variants, priority queues, bandwidth limitation, and traffic shaping...
The advanced wireless technologies make vehicle-to-vehicle communication possible. However, vehicular network has a limitation in terms of network topology rapidly change, which causes discontinuous connection. To support seamless connection, horizontal and vertical handovers are required. The good handover mechanism should take network parameters, user requirements, and application QoS into account...
In a mobile cellular network, both new originating calls and handoff calls can be dropped at any time in the midst of a conversation when a user enters in a dead spot. Because of this, there is always some discrepancy between traffic originated by the mobile station (MS) and that of received by the base station (BS). A probability model is used in this paper to evaluate this discrepancy considering...
We first propose a discrete-time Markov queueing model for a wireless lossy butterfly network which employs opportunistic network coding and dynamic buffer allocation at the bottlenecked relay node. Unlike earlier studies - which assume two or more static buffers at the relay, one for each packet flow - we propose that the relay dynamically allocate buffer space to incoming packets without assuming...
Data caching is one of the attractive techniques that can increase the efficiency of data access in wireless multi-hop ad hoc networks. However, it is still a challenging task to achieve an optimal trade-off between the total traffic cost and average access delay by properly selecting cache nodes, i.e. cache placement. In this paper, we address the problem of cache placement in wireless multi-hop...
Choosing strategic locations to optimally place gateways prior to network deployment in wireless mesh networks (WMNs) can alleviate a number of performance related problems; it can also lead to better handling of network scalability. Existing solutions that address the optimal gateway placement problem differ mainly in terms of the set of constraints that the placed gateways has to satisfy; the resulting...
Many existing routing protocols for wireless mesh networks (WMNs) are based on minimal hop counts and cannot fit WMNs because they did not take into account congestions in networks. Although other multipath routing protocols use node- or link-disjoint routes, they are still based on minimal hop counts and may even cause extra congestion into networks. This is because a node-disjoint path may contain...
Backhaul network plays a significant role to interconnect access points and further connect them to gateway nodes. A failure sustainable wireless backhaul topology is proposed to ensure undisrupted telecommunication services even in the presence of occasional node or link failures. Furthermore, a new control message, called reverse notification, is proposed to improve the performance of coordinated...
Ad hoc routing protocols like DSR, AODV, and OLSR have been studied under many simulation tools in many literatures recent years. The evaluation results in these literatures are mostly obtained under the wireless channel model with constant coverage and attenuation, and usually studied under particular scenarios. This lead to a consequence that the simulation result isn't consistent with the actual...
This paper considers the problem of routing packets across a multi-hop wireless network while ensuring throughput optimality. One of the main challenges in the design of throughput optimal routing policies is identifying appropriate and universal Lyapunov functions with negative expected drift. The few well-known throughput optimal routing policies in the literature are constructed using simple quadratic...
The mobile wireless metropolitan area network (WMAN) architecture imposes a demanding reliable transmission requirement on both base station and mobile station to provide continuously bi-directional services. The transmitter will functionally allocate a buffer for outbound traffic, and thus naturally provide reliable transmission by using the acknowledgement scheme and the automatic repeat request...
Nowadays public Internet access in residential areas is provided via fixed legacy wired infrastructure. Alternately, this paper analyzes a low cost, easy-to-install 802.11s wireless mesh based solution to ensure the transition to a network operating in a wireless environment. The presented simulations for the considered scenario take into account the quality of service provided to the end consumer,...
Peer-to-Peer (P2P) video streaming services on the Internet have gained increasing popularity during the past few years. However, many problems still need to be addressed before it can be widely deployed in the wireless environment. The existing P2P overlay network architecture hides the underlying network topology, assuming channel quality is always in perfect condition. This works well for the Internet-based...
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