Tag Archive: '2015 opnet projects'

Study on impact of Vertical Sectorization on mobility and existing MRO performance

Mobility robustness optimization (MRO) is one of the Self Organizing Network (SON) features that automatically adjusts network mobility configurations by detecting problems and correcting handover (HO) parameters. The existing MRO operation is based on stationary network deployment assumption where handover error statistics are continuously monitored between cell-pair borders as long as the cells shape and neighbor relationships are maintained. In the […]

VoIP Opnet Source Code

130-320-GHz CMOS Harmonic Down-Converters Around and Above the Cutoff Frequency

We present an analytical model, design, and measurement results on fundamental, harmonic, and subharmonic down conversion mixing approaches in 65-nm CMOS around and above the transistor cutoff frequency fmax, targeting submillimeter-wave operation. Analytical expressions for the mixing approaches are derived and compared with the simulation and measurement results. To investigate how to improve the performance […]

d2-LBDR: Distance-driven routing to handle permanent failures in 2D mesh NoCs

With the advent of deep sub-micron technology, fault-tolerant solutions are needed to keep many-core chips operative. In NoCs, Logic Based Distributed Routing (LBDR) proved to be a flexible routing framework for 2D meshes with link and router faults. However, to provide full coverage, LBDR requires a module named FORKS which replicates some messages. This imposes […]

Evaluation of cognitive radio for mission-critical and time-critical WSAN in industrial environments under interference

The evaluation of Cognitive Radio (CR) for Wireless Sensor and Actuator Networks (WSANs) in industrial wireless automation applications is presented in this contribution. Current wireless solutions do not ensure enough performance for hard real-time and reliability requirements, based on time-critical data traffic. These industrial applications are characterized by harsh environments, where the robustness of wireless […]

An area packet scheduler to mitigate coexistence issues in a WPAN/WLAN based hetergeneous network

Energy constrained devices, operating on short-range wireless networking standards such as IEEE802.15.4 and IEEE802.11x, are expected to be deployed for the IoT (Internet of Things) applications. However, co-located deployment of such devices based on different standards using the same 2.4 GHz license free Industrial, Scientific and Medical (ISM) spectrum, introduces coexistence issues, specifically intra-and inter […]

Impacts of sub hub on connectivity of IEEE 802.15.4 in healthcare environments

In this paper, we consider IEEE 802.15.4 based wireless body area sensor networks(WBASN) in the healthcare environment. Connectivity is a critical constraint in the healthcare environment. In particular, disconnection from a sensor hub is a significant problem that leads to sensor node orphaning. To address this, we propose to use a sub hub designed to […]

A distributed energy efficient packet transmission algorithm for the IEEE802.11 WLAN

IEEE802.11 based WLAN networks are considered to be the default broadband access network supporting a range of traffic sources. In this paper a dual parameter based cost function is proposed which can be used to determine the transmission data rate for a transmitting WLAN device in order to maximize the energy efficiency of an infrastructure […]

SDN and ForCES based optimal network topology discovery

Software-defined Networking proposes an alternative paradigm on network programmability based on the separation of control and forwarding planes. Discovering network elements in a dynamic and optimized fashion, able to cope with the ever-growing network traffic, is a key requirement for SDN networks, in order to ensure a data center’s robustness and manageability. OpenFlow’s approach for […]

An Information-Centric Communication Infrastructure for Real-Time State Estimation of Active Distribution Networks

The evolution toward emerging active distribution networks (ADNs) can be realized via a real-time state estimation (RTSE) application facilitated by the use of phasor measurement units (PMUs). A critical challenge in deploying PMU-based RTSE applications at large scale is the lack of a scalable and flexible communication infrastructure for the timely (i.e., sub-second) delivery of […]

  • 1
  • 2