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In this paper, we propose a new Medium Access Control (MAC) protocol for Wireless Sensor Networks (WSNs) called MMSMAC (Multi-Mode Sensor MAC protocol), which can operate and switch among three modes: synchronous, asynchronous, and hybrid, according to the application requirements. In the synchronous mode, MMSMAC organizes the sensor nodes under even and odd clusters. Each sensor node has its own...
There exist numerous routing protocols proposed to allow efficient routing in the network where the end-to-end paths are spontaneously unstable. Such networks are termed as Delay-tolerant-networks (DTNs). The existing famous routing protocols still remain important issues that need to be solved. For example, Epidemic quickly drains the resources of the network; PROPHET causes the unbalanced traffic...
In this paper, a novel interference aware, energy efficient resource allocation scheme based on signal to interference plus noise ratio (SINR) rank restrictions is proposed for beyond next generation mobile networks. The relationship between the choice of base stations (when their ranking and selection is based on SINR) and inter-cell interference is examined. It is observed that lower SINR choices...
Tactical mobile ad hoc networks have a hierarchical organization with soldiers reporting to their group leader and from them to the command center. In such a network, it is important to prioritize the traffic associated with the leaders without starving other essential communication in the network. To support such a feature, we propose a hybrid routing protocol, named as “Rank-aware Tree-based Geographical...
In this paper, a distributed traffic-balancing routing protocol is proposed for multi-sink industrial wireless sensor networks that effectively distributes traffic from sources to sinks. Each node has a gradient field that is used to decide on a neighbor node to reach a sink. The node's gradient index contains (1) the distance cost from source to a respective sink, and (2) traffic information from...
Data dissemination in vehicular ad hoc networks (VANETs) has recently received considerable attention. Due to the unique characteristics of VANET, the implementation of reliable data dissemination among vehicles has encountered many challenges. In this paper, a reliable and efficient data dissemination scheme is presented. Relative locations between neighbor vehicles are predicted to improve delivery...
Currently, there are several wireless access networks available to support mobile users. Furthermore, new services have also emerged and aim to allow such mobile users to access the services from anywhere at any time without interruption while moving across heterogeneous wireless access networks. The new services require internetworking and integrated solutions between existing heterogeneous wireless...
This paper focuses on the performance measurement upon different terrains in 3D wireless sensor networks. We investigate the impacts of traffic load and operation mode in specific 3D terrains based on Durkin¡¦s propagation model. We also investigate the effects of different beacon interval and super frame duration in the IEEE 802.15.4 MAC super frame. Many comprehensive studies are shown by comparing...
The existing energy saving algorithms are implemented only with one kind of Passive Optical Network (PON). However, as far as Ethernet PON (EPON), good performances can not be reached simultaneously in both 10G-EPON and 1G-EPON. 10G-EPON can provide higher throughput and lower delay than 1G-EPON, but it consumes more energy. Therefore, to obtain trade-off performances, we propose a new Energy Saving...
Geographically distributed data centers for the rapid growth of worldwide cloud service bring the demand of massive inter-data center information exchange. Considering the capacity and costs, existing optical networks show their advantages to carry the non-interactive, delay tolerated and bulk inter-data center data. In order not to affect the real-time traffic, these bulk data is usually transferred...
There are kinds of Internet applications such as VoIP, online gaming and video Conferencing which need quality of service guarantees making the performance analysis critical, and the traffic of such applications usually exhibits the properties of self-similarity and heavy tail. In this paper, we use the generalized Stochastically Bounded Burstiness model to characterize the network traffic with self-similar...
Energy consumption in mobile networks, e.g. 3G networks, may be a substantial part of an operator's expenses. A large part of the total energy of the network is consumed by the radio access network. Today operators are saving energy by turning off carriers or cells during periods with low traffic by manually configuring on-off periods. At the same time, operators are seeking to increase cost efficiency...
The emergence of translucency in WDM networks as a trade-off between the low cost of full transparency and high signal quality provided by full opacity has led to immense interest in translucent network design by the research community in recent years. Efficient translucent network design necessitates the judicious choice of regeneration sites and number of regenerators in order to maintain a predefined...
Service providers are experiencing a challenge that is caused by the explosive growth in demand for high-speed connections to and across metropolitan, regional and core networks. Operators are under pressure to increase the capacity of their networks to meet these ever growing requirements. To improve service agility and network efficiency and reduce costs throughout their entire infrastructures,...
In this present work, we propose a scheduling approch for heterougeneous traffic over network. The proposed scheduling not only satiesfies the QoS requirements of the real time flows (class-1) but also continues providing best effort service to non real time flows (class-2). Many scheduling techniques have been proposed to respond to the temporal requirements of real-time jobs (flows). The technique...
This paper investigates the impact of network structure on latency in complex networks under two different routing strategies. The performances of both scale-free networks and random networks are compared and evaluated under the shortest path routing strategy and least cost routing strategy. Our study shows that under the shortest path routing strategy, the scale-free network fares much worse compared...
Opportunistic networks is one of the fast developing research areas in mobile communications. Under opportunistic networks, mobile nodes try to communicate with other nodes without any prior information and knowledge about the network topology. Furthermore, network topologies are dynamic and can rapidly change. In addition, communication under opportunistic networks is erratic, thus routes between...
Traffic volume control is one of the fundamental requirements in traffic generation and transformation. However, due to the complex interactions between the generated traffic and replay environment (delay, packet loss, connection blocking, etc), controlling traffic volume in interactive network traffic replay becomes a challenging problem. In this paper, we present a novel model-based analytical method...
NoC performance largely depends on the underlying deadlock-free and efficient routing algorithm. Selection strategies play a pivotal role in the effectiveness of the routing algorithm by selecting the final output channel when there is more than one possible output link returned by an adaptive routing. In this paper a novel selection strategy, LATEX, is proposed that can be used with any adaptive...
Understanding network latency is important for providing consistent and acceptable levels of servicesin network-based applications. Due to the difficulty of estimating applications' network demands and the difficulty of predicting network load, however, the management of network resources has often been ignored in network-based systems. This paper presents network traffic oscillating behavior that...
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