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In Ad Hoc technology, a mobile node is characterized by a limited battery power. Therefore, the energy consumption becomes an important challenge that must be taken into account when designing a new Ad Hoc routing protocol. An efficient routing protocol should also consider a high level of Quality of Service (QoS) such as the end-to-end delay and the bandwidth as the applications do not have the same...
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...
Cognitive Radio (CR) presents a new approach to wireless spectrum utilization. A big number of Routing Protocols for Cognitive Radio Ad Hoc Networks (CRAHNs) have been proposed to increase the efficiency of spectrum utilization. These protocols don't maintain the QoS mechanisms. Many revisions are done to the CRAHN protocols to meet QoS challenges focused on bandwidth, end to end delay, total packets...
The increase in number of users in Wireless Mesh Networks (WMNs) setups consequently represents an upsurge in numbers of services. Services such as internet, e-commerce, audio streaming, Voice over Internet Protocol (VoIP), Video on Demand (VoD), file and printer sharing among others will be clogged and ran over WMNs. This further leads to poor Quality of Service (QoS). Quick and timely discovery...
Nowadays Vehicular Ad hoc Networks is one of the most promising application areas of the wireless networks, able to organize without predefined infrastructure. In particular, the transmission of video data in the ad-hoc represents a major issue due to the immense enrichment by the video information of the quality of experience perceived by the user and knowledge of the environment in many applications...
Ad hoc wireless networks are influence embarrassed because nodes function through restricted battery energy. Therefore, Energy expenditure is central propose of new ad hoc routing protocols. To propose such protocols we contain to give the impression of being missing from the conventional minimum hop routing schemes. Moreover, limited-energy property makes together nodes and network lifetime surrounded...
Mobile ad hoc networks (MANETs) are temporary networks which are formed for a specific purpose. They are infrastructureless, autonomous and entirely distributed systems where different wireless mobile nodes are capable of arbitrary movement and power switching without breaking the network connectivity since it is physically possible. In these networks, nodes must operate both as hosts and as routers...
Mobile networks in the military tactical domain, include a range of radio networks with very diverse characteristics and which may be employed differently from operation to operation. When interconnecting networks with dissimilar characteristics (e.g. capacity, range, mobility) a difficult trade-off is to fully utilize the diverse network characteristics while minimizing the cost. To support the ever...
We present in this paper a multi-layer scheme for QoS Management in MANETs. Our proposal is to combine multiple communication protocols of different layers, to provide an adapted QoS to a different traffic classes. Protocols are modified to improve their awareness of the quality of service, so that new extensions with QoS support are developed. We model QoS service at routing layer, via a QoS extension...
We propose a QoS supporting ad hoc network scheme which employs a hybrid approach utilizing both TDMA and 802.11 DCF and present performance evaluation results of the scheme. In the scheme, TDMA period provides contention free transmissions for QoS flows, and DCF period is used to provide contention-based access for best effort or low priority flows. We evaluate the proposed scheme for various numbers...
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...
Usage of wireless networks is rising in popularity. In this setting different kinds of networks for indoor environments, such as Ad-Hoc, IEEE 802.11b (Wi-Fi) and Wireless Distribution System (WDS) has been developed. In this paper, an analysis of Quality of Service (QoS) has been made for each network in order to verify the values of bit rate, delay, jitter and packet loss. For performance comparison...
When some wireless networks are formed only for a particular purpose, they are the Mobile Ad-hoc Networks (MANETs). They do not depend on any access point for communication; they self-organize, and change topology dynamically. A routing protocol is necessary to help a node discover the routes to other nodes of the network and enable its communication with them. Each routing protocol tends to find...
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...
Adhoc network design goal is to provide internet access anytime characterized by lack of infrastructure and absence of base station, mobility and heterogeneity which require a dynamic efficient routing protocol. We proposed a delay energy aware routing protocol called as reactive congestion aware multipath routing protocol-RCRP aim to select the route based on energy reduction rate and packet delivery...
The paper proposes an adaptive, distributed admission control scheme for the execution of VBR video sessions over ad hoc networks with heterogeneous video and HTTP traffic. The key idea of the proposed scheme is the use of probabilistic radial basis classifiers, which are specialized types of neural networks. Firstly, the admission control function is defined analytically. Afterwards, the neural network...
We propose a QoS supporting ad hoc network protocol which employs a hybrid approach utilizing both TDMA and 802.11 DCF. TDMA period provides contention free transmissions for QoS flows, and DCF period is used to provide contention-based access for best effort or low priority flows. TDMA time slots are assigned on admission basis in a distributed manner by utilizing network routing information and...
Mobile Ad Hoc Networks (MANETs) also called mesh networks, consist of a large number of mobile nodes that communicate with each other in the absence of any fixed infrastructure or centralized administration. The principle characteristics of MANET are the dynamic topology and the limited battery power of mobile nodes. The discharge of the battery causes many problems such as the loss of the packets...
Cognitive Radio Ad-Hoc Network (CRAHN) is an emerging class of mobile ad hoc networks that provides each network node with a list of available channels. It is expected that the available routing protocols and metrics for traditional ad-hoc networks are not suitable for CRAHN in the environment of topology changes and different level of user mobility interference situations. Therefore, to achieve more...
In Mobile Ad Hoc Networks (MANET), delays and bandwidth limitations of the wireless network system adversely affect the performance of the Voice over IP (VoIP). The calls setup time and the voice Quality of service (QoS) of VoIP calls depend on the routing protocol, the mobility model, and the number of hops between the call parties. Number of research efforts used to study the performance metrics...
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