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Significant throughput degradation of multihop path communication in wireless mesh network is one of the major problems in wireless communication. The main reason for the lack of bandwidth is channel interference, which is caused by contention for the shared channel between wireless nodes. The natural approach to overcome this problem is exploiting the availability of multiple channels multiple interfaces...
The IEEE 802.11e technology is receiving much interest due to the enhancements offered to wireless local area networks in terms of QoS. Other application fields for this technology are wireless ad-hoc networks, wireless mesh networks and vehicular ad-hoc networks. In the literature, most of the research works available focusing on the IEEE 802.11e technology offer simulation results alone, being hard...
State-of-the-art hardware based techniques achieve high performance and maximize efficiency of packet classification applications. The predominant example of these, ternary content addressable memory (TCAM) based packet classification systems can achieve much higher throughput than software-based techniques. However, they suffer from high power consumption due to the highly parallel architecture and...
We propose and evaluate a novel improvement to a previously published, unreliable covert channel based on the network traffic of multiplayer, first person shooter online games (FPSCC). Covert channels typically embed themselves within pre-existing (overt) data transmissions in order to carry hidden messages. FPSCC encodes covert bits as slight, yet continuous, variations of a player's character's...
Optimized link state routing (OLSR) protocol is a table-driven proactive routing protocol for wireless mobile ad hoc networks. The key idea behind this protocol is to reduce the control message overheads by marking subset of neighbors as multi-point relays (MPRs). In this paper, we discuss problems of OLSR or other routing protocols that are due to mobility of nodes. We integrate our solutions to...
Handover solutions ensuring seamless connectivity and high user-perceived quality of service for a given application context are essential for multi-mode wireless devices in heterogeneous wireless network environments. A critical handover step, the network selection decision, is automatically and transparently made in the user's terminal, aiming to keep the user ??always best connected??. We propose...
Maximizing network throughput is one of the main objectives in wireless multi-hop networks. However, small link bandwidth and severe interference become two great obstacles in network throughput improvement. Single route always encounters great congestion, especially for multiple flows with the same source and destination. Multi-path routing can solve the bandwidth shortage issue to some extent, but...
A multi-channel MAC is a promising approach for improving network throughput by multiplexing transmissions over orthogonal channels. Molecular MAC has recently adopted this approach by proposing to modify the standard IEEE 802.11 DCF. It requires role and channel assignment to nodes: some of them use a static channel while others dynamically switch to neighbor channels on-demand. To assign roles and...
This paper addresses the power control problem in wireless multiple access communication systems with a multi-packet reception (MPR) channel. Driven by advances in signal processing and multiuser detection (MUD) technologies such as UWB and MIMO, it has become possible for a wireless node to simultaneously receive several packets from other transmitters. In this case, the receiver node can determine...
The demand for multimedia services is increasing and users expect rich services at high quality levels, even while on the move and connected via different wireless networks. This paper proposes a novel signal strength-based adaptive multimedia delivery mechanism (SAMMy) that makes use of the IEEE 802.11k standard when dynamically adjusting multimedia delivery based on estimated signal strength and...
This paper presents an implementation based study of multi-channel medium access control protocols in hardware constrained wireless sensor network (WSN) nodes with 802.15.4 radio. In the network architecture presented, each sensor node has a single radio transceiver that can be tuned to any of the available sixteen non-overlapping channels. The simplest way to select data channel is to use a common...
Multi-path routing is a valuable on-line technique to deal with unpredictable and variable traffic patters, mostly for intra-domain TE, multi-homing, wireless mesh networks, metropolitan access networks, and has been shown efficient for a large spectrum of future traffic scenarios. In this paper we analyze the performance of MIRTO, TEXCP and TRUMP, three recently proposed multi-path routing algorithms...
Due to the ignorance of the relation between different collisions, traditional medium access control protocols cant achieve their anticipated collision resolution results. This paper proposes a novel way to distribute MAC accesses in MANETs based on collision classification approach and modified backoff schemes. The idea is to avoid cross collisions through dynamically allocated elementary windows...
Over the years, a considerable research effort has been applied to the design of ad hoc network routing protocols. However, there is still a lack of understanding of the subtle interactions between routing protocols and lower layers in the protocol stack. In this paper, the instability which may arise when reactive routing protocols interact with the IEEE 802.11 MAC protocol is investigated. In particular,...
We propose a new cross-layer mechanism, referred to as route-control, for mobile ad-hoc networks (MANETs). This mechanism, which works in the network and transport layers, aims at enhancing the performance of MANETs' reliable transport protocols. The main idea behind the proposed mechanism is to notify the sender when the packets of a Transport layer flow change their route. We show that the sender...
With today's widespread deployment of wireless technologies, it is often the case that a single communication device can select from a variety of access networks. At the same time, there is an ongoing trend towards integration of multiple network interfaces into end-hosts, such as cell phones with HSDPA, Bluetooth and WLAN. By using multiple Internet connections concurrently, network applications...
The high-speed WLAN is standardized by the IEEE 802.11 task group n. For wireless access in vehicular environments, it is standardized as IEEE 802.11p which is based on 802.11n. Devices for wireless communication based on 802.11n draft are widely spreading in the world market now, but there is no report available which discusses the performance of such 802.11n devices. In this poster, we introduce...
The self-organizing and decentralized features of wireless mobile ad hoc networks make them suitable for a wide variety of applications. In this paper, we explore their use in rescue and relief applications in emergency situations. We propose to study the efficiency of some routing and MAC protocols under the client-server architecture. The presence of dynamic and adaptive routing and MAC protocols...
This study considers a highway wireless sensor network that is deployed along major highways as an infrastructure for supporting a wide range of traffic monitoring operations. Contrary to other low data rate wireless sensor networks, the highway sensor network is expected to carry rich media (e.g., video) with high throughput and low latency requirements. While line power is potentially available...
In this work, we study a link-weighted and distance-constrained channel assignment problem in multi-channel mesh networks with stationary router nodes, such as community wireless networks. A good channel assignment is given as the one which can minimize interference of each link from its neighboring links and subsequently improve the network throughput. In response to it, we introduce an interference...
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