Dynamic Transfer Mode (DTM) is a ring based MAN technology that provides a channel abstraction with a dynamically adjustable capacity. TCP is a reliable end to end transport protocol capable of adjusting its rate. The primary goal of this work is investigate the coupling of dynamically allocating bandwidth to TCP flows with the affect this has on the congestion control mechanism of TCP. In part...

Network simulator (ns-3) is a reputed simulation platform for performance evaluation of cellular networks. In this work, we explore the use ns-3 tracking successful handovers (HO) and handover failures consequent impact on 4G LTE network throughput with aim discovering new analytical relations about HOs methods to optimize resulting throughput. Decreased cell sizes in newer generation networks ...

The Internet of Things (IoT) paradigm gains more importance each day, as the number and variety connected devices grows. To answer specific needs IoT, many wireless network standards have been developed. An example is LoRaWide Area Network (LoRaWAN), which has gained popularity thanks to affordable costs its gateways, well wide range, low energy consumption flexibility. Considering challenges t...

The Berkeley’s ns-2 simulator was, for a long time, one of the most popular open-source simulation tools. Although the new tool in the ns family, the ns-3, replaced it in the above ranking, the simplicity of the ns-2, with its flexibility and ability to operate at higher levels of abstraction caused the simulator to remain in use. This paper presents our enhancements to the mapping of incoming ...

Optimizing sensor networks involves addressing a wide range of issues steaming from limited energy reserves, computation power, communication capabilities, and self-managing sensor nodes. The ns-2 simulation environment is a flexible tool for network engineers to investigate how various protocols perform with different configurations and topologies. This paper describes how we extended the ns-2...

It is shown that a non-square ( N S ) 2'"+'-ary quadrature amplitude modulation (QAM) can be decomposed into a single-parity-check (SPC) block encoder and a memoryless modulator in such a way that the inherent block encoder has a recursive nature. When concatenated with a forward-error-correcting (FEC) code, iterative demodulation and decoding of the FEC code and the inherent SPC code of NS-2'"...

Wireless and mobile experiments in the real world are not easily or accurately repeatable, reducing the use of such experiments for validation. Most challenges are due to the complications and subtleties of physical movement and wireless propagation, making the system highly variable. Moreover, mobile and distributed applications are characterized by decentralized goals and control, with high l...