Tag Archive: 'opnet simulation'

Energy-Efficient Scheduling Mechanism for Indoor Wireless Sensor Networks

Energy efficiency is one of the most critical issues in wireless sensor networks, since the sensor nodes are usually battery powered. These energy-constrained sensor nodes are usually densely distributed in indoor environments, which leads to spatially correlated sensor data and low network efficiency. Thus, one way to improve energy efficiency is to reduce the redundancy […]

MD2-NFV: The case for multi-domain distributed network functions virtualization

Motivated by the vision of Network Functions Virtualisation (NFV) spanning different administrativedomains, this position paper makes the case for multi-domain, distributed NFV (MD2-NFV). To this end, we present MD2-NFV as a natural evolution of the NFV paradigm to deliver a distributed deployment of Virtualized Network Functions (VNFs) as a service. By means of three motivating use case […]

On Availability-Performability Tradeoff in Wireless Mesh Networks

It is understood from past decade of research that a wireless multi-hop network can achieve maximum network throughput only when its nodes operate at a minimum common transmission power level that ensures network connectivity (availability). This point of optimality where maximum availability and throughput is guaranteed in an interference-optimal network has been the basis of numerous design […]

Future Directions in Cable Networks, Services and Management

This chapter describes cloud, virtualization, software-defined networking (SDN), and self-managed concepts, architectures, and their building blocks, as possible future directions for multiple-system operator (MSO) networks and services. Cloud computing technologies are emerging as infrastructure services for provisioning computing and storage resources on demand in a simple and uniform way. Cloud-based virtualization allows for easy upgrade and migration […]

Social-Aware Stateless Routingin Pocket Switched Networks

Existing social-aware routing protocols for packet switched networks make use of the information about the social structure of the network deduced by state information of nodes (e.g., history of past encounters) to optimize routing. Although these approaches are shown to have superior performance to social-oblivious, stateless routing protocols (BinarySW, Epidemic), the improvement comes at the cost of […]

BRACER: A Distributed Broadcast Protocol in Multi-Hop Cognitive Radio Ad Hoc Networks with Collision Avoidance

Broadcast is an important operation in wireless ad hoc networks where control information is usually propagated as broadcasts for the realization of most networking protocols. In traditional ad hoc networks, since the spectrum availability is uniform, broadcasts are delivered via a common channel which can be heard by all users in a network. However, in […]

Design and Evaluation of the Optimal Cache Allocation for Content-Centric Networking

Content-Centric Networking (CCN) is a promising framework to rebuild the Internet’s forwarding substrate around the concept of content. CCN advocates ubiquitous in-network caching to enhance content delivery, and thus each router has storage space to cache frequently requested content. In this work, we focus on the cache allocation problem, namely, how to distribute the cache capacity […]

Overarching Control of Flexi Grid Optical Networks: Interworking of GMPLS and OpenFlow Domains

Optical transport networks provide transport, multiplexing, routing, management, supervision, and survivability of optical channels. Within a flexible dense wavelength division multiplexing grid, the optical spectrum can be allocated in multiples of a width granularity, depending on the client signal rate and modulation format. A control plane (CP) can be used for efficient and dynamic provisioning […]

An Evolutionary Game Theory-Based Approach to Cooperation in VANETs Under Different Network Conditions

Vehicular Ad hoc NETworks (VANETs) belong to a class of complex networks due to constant addition and deletion of nodes. Stimulating cooperation in these networks is a research challenge due to this uncertainty. The reason is that the node behavior is highly influenced by the neighborhood structure. Game theory has been significantly used to model ad hoc […]

Analytical model of multihop IEEE 802.15.4 for lossy medium

Wireless sensor networks (WSN) are used in many fields such as industrial control, building automation, environmental monitoring, etc. IEEE 802.15.4 standard defines the features of MAC layer and physical layer for WSN. Many analytical models studied the performance of the multihop IEEE 802.15.4 networks under the assumption of ideal wireless channel, and they did not […]