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A mobile ad hoc network (MANET) consists of a group of communicating hosts that form an arbitrary network topology by means of any of several wireless communication media. MANET communications represent a diversification in communication technology necessary to solve the stringent end-to-end requirements of QoS-based communication networks. Of the many challenges in this complex distributed system,...
Quality of Service (QoS) routing is known to be an NP-hard problem in case of two or more additive constraints and several exact algorithms and heuristics have been proposed to address this issue. In this work, we consider a particular two-Constrained Quality of Service Routing Problem where one constraint is superlative and the other is comparative. We consider the superlative constraint to represent...
The rapid evolution of telecoms industry is accompanied by a huge increase of energy consumption of mobile networks, which forces the operators to exploit the potential of new techniques to save energy. In this paper, we propose a novel deployment strategy which is able to adapt itself to the spatial variation of the traffic by enhancing the cell radius in the low traffic areas, while the target quality...
Mobile ad hoc networks are self organizing multi-hop wireless networks with no fixed infrastructure. All the users in these networks are mobile. The mobiles communicate either directly or via other nodes of the network by establishing routes. The mobility of nodes causes the existing links to be break frequently. So if we can predict future movement, the resources reservation can be made before be...
SIP (Session Initiation Protocol) is standardized by Internet Engineering Task Force (IETF) as a signaling and control functionality for multimedia services (video and audio). However, SIP is a text-based protocol with messages usually exceeding several hundred bytes in size, thus causing high call set-up latency over low bit-rate links. As a consequence, SIP suffers from undesirable delay which is...
TCP, the facto standard used in today's Internet, has been found to perform poorly in Mobile Ad Hoc Networks (MANETs). This is exacerbated by contention with increasing UDP-based high priority multimedia traffic and the class differentiation introduced in current QoS protocols, which results into TCP starvation and increased spurious timeouts. In this paper, we propose a cross-layer TCP enhancement...
Wireless ad hoc networks are a type of wireless network that can be easily created without the need of network infrastructure or central administration. Unfortunately, wireless ad hoc networks suffer from some limitations related to the bandwidth leakage. So a proper data flow mechanism should be used to save the bandwidth consumption. So we proposed an XCAST based routing protocol (P-XCAST) to be...
Routing is a challenging task in mobile adhoc network due to nodal mobility, unstable links and limited resources. Swarm intelligence, as demonstrated by biological swarm, such as ant colony has found to be a attractive technique for routing in MANET. However existing swarm intelligence based routing protocols find an optimal path by considering only one or two route selection metrics, such as hop...
The cross-layer design approach is an important concept in mobile ad-hoc networks which is adopted to solve several open issues. It aims to overcome MANET performance problems by allowing protocols belonging to different layers to cooperate and share network status information while still maintaining separated layers. While cross-layer model could enhance the performance of the applications and achieve...
IP telephony over mobile ad hoc networks is a topic of emerging interest in the research arena as one of the paths toward the fixed-mobile convergence in telecommunications networks. To investigate the performance characteristics of this service, we propose a complete system architecture, which includes a MAC protocol, a routing protocol, and the treatment of voice packets. The telephone system is...
DiffServ offers an attractive solution to quality of service (QoS) for mobile ad-hoc networks (MANET)s since the overhead of alternative flow based QoS metrics and signaling is not required. However, within prioritized classes and in the presence of dynamically forming bottlenecks, DiffServ can lead to brittle failure modes in which all flows are highly penalized and subsequently fail rather than...
Quality-of-service (QoS) signaling protocols for mobile ad hoc networks (MANETs) are highly vulnerable to attacks. In particular, a class of denial-of-service (DoS) attacks can severely cripple network performance with relatively little effort expended by the attacker. We propose a distributed QoS signaling protocol that is resistant to a large class of DoS attacks. The key elements of the scheme...
Multicast routing protocols proposed for mobile ad hoc networks have certain limitations. Most of these protocols try to discover the route on-demand by flooding route request messages, which results in increased end-to-end latency and also consumes considerable amount of network bandwidth. These limitations make protocols not suitable for real-time multimedia communication. In this paper, we have...
This paper presents a new approach of integrating prioritized admission control into QoS routing to achieve load balancing and avoid bandwidth fragmentation in mobile ad hoc networks (MANETs). As a crucial part of this new approach, the prioritized admission control algorithm is defined to give preference to high-bandwidth connections. An algorithm named bandwidth upper bound with dynamic dropping...
Ad-hoc networks are flexible, self-configurable, easy and fast to deploy. Research has been done mainly in the area of routing and for isolated ad-hoc networks. Some efforts are on the way to connect ad-hoc networks to the Internet. It is however important to support QoS aware multimedia applications in this environment. Therefore, a QoS architecture for ad-hoc networks is necessary that can interwork...
In a bilateral teleoperated system, the signal transmissions between the operator and the slave manipulators have different QoS requirements in comparison to traditional network traffic. Running teleoperated systems over wireless networks poses more challenges in comparison to wired networks. The media streams involved differentiate themselves from other media types in that they require both reliable...
The quality of service (QoS) routing has been receiving increasingly intensive attention in the mobile ad hoc networks (MANETs) fields, but it is difficult to solve the problem for the nature of MANETs such as performance constraints and dynamic network topology. In order to increase the probability of success in finding QoS feasible paths and reduce average cost in flooding path discovery scheme...
We propose the prioritized binary countdown (PBC) scheme for effective quality of service (QoS) supports in mobile ad hoc networks. We evaluate the performance of PBC, IEEE 802.11,802.11e, and two extensions to 802.11e in terms of their differentiation capability, throughput, delay, discarding ratio, blocking rate, and collision rate. Our simulation results show that PBC has considerably higher throughput...
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