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For ad-hoc wireless sensor networks (WSN), multi-hop routing has been adopted in order to save communication power consumption and to increase network lifetimes. In contrast to traditional multi-hop routing, the Opportunistic Routing (OR) protocol provides an alternative and efficient method for exploiting the spatial and temporal characteristics of wireless networks. One of the more important aspects...
Transmission of video and imaging data requires both energy and QoS aware routing in order to ensure efficient usage of the sensors and effective access to the gathered information. In large-scale networks with a large number of sensor nodes, multiple sink nodes should be deployed to increase the manageability of the network and also to reduce the energy dissipation at each node. In this paper we...
Protocol Independent Multicast - sparse mode (PIM-SM) builds a shared distribution tree centred at a Rendezvous Point (RP) and then it builds source specific trees. The RP selection problem is very trivial in PIM-SM because it not only affects the structure of the multicast tree but also affects the performance of multicast. In this paper, we propose an Adaptive Tabu Search based algorithm for RP...
Multicast is one of the key technologies for supporting the multimedia networks services. Based on the concept of the distributed algorithm theory, this paper discusses a multimedia communication model and its corresponding data structure, and also simulates RPM algorithm by using forwarding table, the time line and data packet cache to discuss the algorithm QoS solution.
The transmission of video and imaging data in Wireless Multimedia Sensor Networks (WMSN) requires both energy efficiency and QoS assurance, in order to ensure the efficient use of sensor resources, an Ant Colony Optimization based QoS routing model is proposed to improve the routing protocol of WMSN. Firstly, a routing model for WMSN QoS was presented and then a routing algorithm ACOWMSN was brought...
This paper proposes a solution for throughput and stringent delay problems of VoIP in Ad-Hoc mode of IEEE 802.11 WLAN standards. This paper analyses the behaviour different codecs and schemes of WLAN running on VoIP traffic and draws a conclusion on the performance of network based on the criteria of different QOS parameters. Later the suitability of different routing protocols like AODV, DSR, OLSR...
A new localized quality of service (QoS) routing protocol for wireless sensor networks (WSN) is proposed in this paper. The proposed protocol targets WSN's applications having different types of data traffic. It is based on differentiating QoS requirements according to the data type, which enables to provide several and customized QoS metrics for each traffic category. With each packet, the protocol...
Delivering desired QoS to the applications is one of the most important challenges in next generation networks. Designing efficient queue management in midway nodes leads to improvement in NGN efficiency. This paper presents fair Efficient active Queue Management (EQM) mechanism for congestion avoidance and control in next generation networks. Proposed AQM mechanism uses instantaneous queue length...
Multipath Transport Protocols like Stream Control Transmission Protocol (SCTP) and Multipath TCP (MPTCP) support concurrent usage of multiple paths between the end users. In this paper we investigate the flow division at the source among multiple paths as an optimization problem. We also introduce link-by-link error recovery scheme and compare the system performance when the traditional end-to-end...
In this paper, we discuss the issues of QoS multicast routing in multi-hop Cognitive Radio (CR) networks. The problem of our concern is: given a CR network and a QoS multicast request, how to set up a multicast connection so that the total bandwidth consumption of the multicast is minimized while the QoS requirements are met. We propose a distributed protocol which uses shortest path tree as the multicast...
As wireless communication gains popularity, significant research has been devoted to supporting realtime transmission with stringent Quality of Service (QoS) requirements for wireless applications. At the same time, a wireless hybrid network that integrates a mobile wireless ad hoc network (MANET) and a wireless infrastructure network has been proven to be a better alternative for the next generation...
Wireless Sensor Networks (WSNs) are highly distributed networks consisting of a large number of tiny, low-cost, light-weight wireless nodes deployed to monitor an environment or a system. Each node in a WSN consists of three subsystems: the sensor subsystem which senses the environment, the processing subsystem which performs local computations on the sensed data, and the communication subsystem which...
In a resource constrained wireless sensor network (WSN), communication tasks can be expensive in terms of power consumption. Thus, when good communication is required, a mechanism that can maximize the chances of a successful transmission of information via wireless network is very desirable. The Opportunistic Routing (OR) protocol has been proposed as an alternative and efficient method for exploiting...
Recent technological advances in miniaturization and wireless communication have made Wireless Sensor Networks an active research field. The increasing number of multimedia and real-time applications for Wireless Sensor Networks has led to a growing interest in Quality of Service for this category of networks. In this paper, we propose a QoS-geographic and energy aware routing protocol for Wireless...
This paper presents the summary of a method proposal for designing Quality of Services Models in Networks. The proposal consists of several steps where Real System is defined and specified with the hypothesis and the problem which will be solved by the model; then, the model is defined, taking it into account as a real system abstraction, and ends with the implementation and simulation of the model...
As a new networking topology, Wireless Mesh Networks (WMNs) have advantageous properties in terms of robustness, range extension and density, but also have significant potential disadvantages, which determines some classical load-balancing algorithms are not very suitable for WMNs. In this paper, we propose a novel load-balancing algorithm to improve the networks performance. The new scheme, which...
This paper presents a Model of Quality of Service (QoS) for Next Generation Networks (NGN), that consist of a tower of five defined layers such as the Model Layer of QoS, Control of Admission, QoS in the Routing, QoS in the Signaling, and MAC QoS. In addition, the model raises a method based on the concept of segregation of functions defining two functional networks along with the tasks of QoS. Then,...
In sparse mobile sensor networks, nodes have a small number of neighbors with intermittent connectivity. This paper presents a new networking protocol for this type of network, aimed at maximizing system performance in terms of both delay and reliability. The system is motivated by the observation that many applications on this type of network have two kinds of co-existing data packets: those with...
OLSR is a well-known proactive protocol for wireless networks. Although very efficient by many points, it suffers from the drawbacks of not taking into account QoS metrics such as delay or bandwidth. To overcome this pitfall, some QOLSR (QoS OLSR) solutions have been designed. Nevertheless, they still provide weak performance regarding QoS metrics. In this paper, we introduce a novel and simple neighbor...
The introduction of real time communication has created additional challenges in the wireless networks area with different communication constraints. Sensor nodes spend most of their lifetime functioning as a small router to deliver packets from one node to another until the packet reaches the sink. Since sensor networks represent a new generation of time-critical applications, it is often necessary...
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