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Because the wireless sensor network (WSN) has the characteristics of dynamic change of network topology, wireless link interference, and many-to-one, it is easy to cause congestion in wireless sensor networks. Analyzing the current congestion detection algorithms, Aiming at the characteristics of wireless sensor networks with limited data source, proposed congestion control algorithm based on a small...
The Internet is everywhere, now everyone has at least one device which is connected to some kind of computer network. Not only wired but wireless communication technologies have become part of everyday life, as well. Because of the dynamic evolution of the WiFi services, majority of the enterprises and higher education institutions have a sort of own wireless infrastructure on their sites or campuses...
Wireless Sensor Network (WSN) is comprised of small and low-cost sensors deployed in a particular region in order to monitor a phenomena. In this paper, we have addressed some problems, which have significant effects on the performance of WSNs while computing the path from source to the base station. Although in the literature, many MAC protocols for WSNs have been proposed based on QoS to save the...
In an emergency situation, the information availability, reliability, security and delay of its delivery are critical to the success of rescue operations. The use of wireless sensor networks (WSN) in this type of applications allows having an almost real situation about the supervised area by collecting relevant information. This paper proposes a new Framework Ad-M-QoS-DS (Adaptive Management of QoS...
Wireless sensor networks (WSN) are highly distributed self-organized systems, the associated research being growing at a tremendous pace, and targeting various application domains. The successful implementation of such networks is dependent on the enabling technologies (such as digital electronics and wireless communications), as well as the provisioning of Quality of Service (QoS) and various security...
Wireless Sensor Networks (WSNs) comprise of groups of tiny sensor nodes that are deployed for collaborative missions such as environmental monitoring, target tracking and surveillance. Due to the miniature size of the nodes, they are typically deployed in large numbers and communicate via multiple hops through a wireless shared communication channel. The successful implementation of such networks...
In this paper, based on requirements of wireless Mesh network Multi-service and high speed, Is proposed based on more access control technology and the QoS control technology of new wireless resource allocation methods of the upward, To better solve the uplink bandwidths business concurrently, And both to delay and bandwidth requirements, improving the bandwidth of the system. Finally, simulation...
It is difficult to provide QoS guarantees for streams in wireless network based on IEEE802.11 DCF because of limited bandwidth. Taking CBR traffic as example, we studied the traffic performance with different parameters in this paper. The results show that for an overloaded network, the traffic with longer packet size has greater throughput. Since the MAC layer performs the same competitive algorithm,...
IEEE 802.15.4 is the emerging next generation wireless standard designed for low-rate wireless personal area networks (LR-WPAN), which suit wireless sensor networks applications. It attempts to provide a low cost, low power and short range wireless networking. The QoS is more challenging in heterogeneous wireless sensors networks, where a diverse mixture of sensors for monitoring temperature, pressure,...
Wireless Sensor Networks (WSNs) are composed of autonomous and resource-constrained (power, sensing, radios, and processors) nodes. These networks are conceived to have a large number of nodes working on monitoring phenomena. A major challenge for theses networks is to provide solutions that maximize quality of service (QoS) requirements, such as coverage and data routing, and minimize the energy...
Wireless Sensor Networks (WSN) now advance into areas where new scenarios and applications require WSNs to meet certain Quality of Service (QoS) requirements. To tackle these challenges, a routing approach has to consider limited energy supply of sensor nodes, dynamic network conditions as well as node mobility. This paper presents QoS-AODV6E, a routing scheme based on the Ad-hoc On-Demand Distance...
Cognitive Wireless Network (CWN) is expected as one of the most efficient transmission methods to solve today's wireless problems like the lack of wireless bands or the efficient usage of limited wireless resources. However, CWN have not established effective transmission methods considered with QoS or upper layers protocols yet. In this paper, selective transmission control method in cognitive wireless...
Cognitive Radio (CR) seems to be a promising solution to the radio spectrum congestion problem by opportunistic uses of the spectral holes to achieve efficient use of the frequency resource by allowing the coexistence of licensed (primary) and unlicensed (secondary) users in the same bandwidth. According to the cooperative wireless communication (CWC) concept the active nodes may increase their effective...
Object tracking is one of the fundamental applications in Wireless Sensor Networks (WSNs). To detect and track the appearance and movement of malicious object(s), a number of sensors are usually deployed randomly in the area of interest specially for hostile application scenarios. Following random deployment strategy, the resulting WSNs conform to Poisson or Gaussian distribution, depending on specific...
One fundamental issue in the sensor networks is the coverage problem, which we would like to determine whether a region of interest is sufficiently covered by a given set of sensors. It can be considered as a measure of the quality of service (QoS) in the sensor networks. There are several efforts that design efficient algorithms to compute coverage; however, they have not considered the presence...
The following topics are dealt with: mobile ad-hoc network; sensor network; data management; network management; routing; localization; power awareness; energy efficiency; performance evaluation; QoS; MAC; coding application; network security; network privacy; target tracking; and performance enhancement.
Intelligent Transportation system (ITS) using wireless and mobile ad-hoc sensor network has inspired many autonomous applications. Vehicular Ad-hoc network (VANET) is an emerging technology where vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communicate wirelessly using dedicated short-range communication band. In sensor based VANET (S-VANET) issues like response time, data aging, bandwidth,...
This paper is to solve the problem of route resources waste in flow-based QoS routing protocol for WSN. Competition for limited resources will rose when there are two or more real time data flows between same source node and destination node, Variable ??port?? is set to identify different real time data flows before, which also leads to waste of route resources. Thus we set a time variable called...
Mobile ad hoc networks (MANETs) are dynamic mobile networks that can be formed in the absence of any pre-existing communication infrastructure. MANETs are vulnerable to jamming attack due to their salient characteristics. The objective of a jammer is to interfere with legitimate wireless communications, and to degrade the overall QoS of the network. In this paper, we propose a new method to react...
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