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Wireless network is based on packet switching concept and is capable of handling various types of applications. The challenge is to attain a better Quality of Service (QoS) for the like applications of real time and non-real time in an intriguing environment with varying bit rate, unexpected channel lay off. The intention of QoS provision is to afford the opted services for the users while utilizing...
The self-organizing wireless Mobile Ad-hoc Networks are characterized by the routing protocols they employ and the wireless technology used by the nodes in those networks. Process of route formation in MANETs is based only on the decision of network layer; resulting in network prone to congestion and degraded performance. Constraints imposed by MAC sub-layer and PHY layer go unnoticed with conventional...
In this paper, we propose a cross layer optimization technique for video transmission in multi-radio Wireless Mesh Networks (WMNs). WMNs are used as back haul to connect various networks such as Wi-Fi, Wi-MAX etc. to the internet. The presence of multiple radios in this networks increases the capacity but introduces an interference. Thus, designing a better routing metric to find optimal path is an...
Mobile Ad Hoc Networks (MANETs) are a self organizing and adaptive wireless networks. Currently MANETs possess an advanced challenge in providing Quality of Service( QoS) support for real time application data streaming through the network. These applications are delay sensitive and get affected due to congestion in the network. Thus, performance degrades due to high data loss, frequent link breakage...
Modern wireless devices, which implement the 802.11b standard, utilizes multiple transmission rates in order to accommodate a varied range of channel conditions. Many rate adaptation algorithms proposed, utilizes the multi data rate, primarily according to the current channel quality. Most algorithms do not consider congestion around the network and proper determinant to identify it. In multi rate...
To enhance the QoS performance in saturated multihop adhoc networks, it is essential to have cooperative algorithms for MAC layer contention resolution and TCP layer congestion control. This paper proposes a cross layer approach that modifies the back off mechanism and congestion control technique using Fibonacci sequence. Due to the golden section property of Fibonacci sequence, contention and congestion...
Wireless multimedia sensor networks consist of thousands of sensor nodes and one or more sink nodes which are distributed in a geographical area to gather information about physical phenomenon of interest. Nowadays modern motes have many sensors running in them and they sense different physical quantities such as temperature, pressure, light etc. When these sensor nodes are used for monitoring mission...
In this paper we introduce a novel cross layer design between MAC and physical layers. Our novel design is based on controlling the adaptive modulation and coding (AMC) transmission mode at the physical layer according to the queue length of finite buffer at the data link layer and each transmission mode of AMC. The aim is optimizing system performance over a wireless link, preserving the important...
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