In this project, we set up a mesh network testbed with nine desktops and three laptops. We install on desktop two Atheros radio cards and one wispy device to implement a flexibility test environment for mesh network, multi-radios network and measurement based network experiments. Each laptop has one Atheros PCMCIA radio card, which can implement the mobile situation for network measurement. The...

In this paper, we present a network flow based approach for network selection for secondary users in cognitive radio networks. Most approaches in the current literature on cognitive radio do not consider network selection. We present a network flow framework for network selection. We show that our approach can enable re-assignment of networks to secondary users and also re-assignment of channel...

Wireless sensor network contain hundreds of sensor nodes. These sensor nodes uses radio signal using communication. A wireless sensor node is well found with radio transceiver, sensor device and power component. A wireless sensor network is made up of sensor, embedded techniques, distributed information mechanism. Wireless sensor network is much versatile as compared to traditional wireless net...

This paper presents a comparative study between results of a single channel multihop wireless network testbed and the network simulators ns-2 and ns-3. We explore how well these simulators reflect reality with their standard empirical radio modeling capabilities. The environment studied is a corridor causing wave-guiding propagation phenomena of radio waves, which challenges the radio models us...

The expected number of transmission (ETX) represents a routing metric that considers the highly variable link qualities for a specific radio in Wireless Sensor Networks (WSNs). To adapt to these differences, radio diversity is a recently explored solution for WSNs. In this paper, we propose an energy balancing metric which explores the diversity in link qualities present at different radios. Th...

In this paper, based on the analyzed emerging challenges encountered by the future radio network, we focus on several candidate techniques targeting at a more spectrum-efficient and cost-effective solution. Among them, spectrum management is one special topic covering fields of technique, regulation and politics. We point out the high tendency of spectrum liberation in terms of spectrum allocat...

Radio system evolution is moving towards total convergence to achieve: multi-services, multi-standards, multi-bands, reconfigurable and reprogrammable systems. Such systems are based on cognitive radio technology, by giving more intelligence to radio system devices, in order to facilitate the administration and to ensure the network selfoptimization. Several protocols are used such as Network M...

This article adopts the assumption that different wireless access technologies (e.g., UMTS, HIPERLAN2, and DVB-T) can be cooperating components of a composite radio infrastructure. The coordinated management of services and network in this heterogeneous context is a complex task. This article presents a service and network resource management platform for wireless systems that operate in a comp...

In second and third generation cellular networks the rollout of base stations needs to be conscientiously prepared, because their radio configuration should match with the coverage provided by existing cells in their neighborhood. The detailed radio planning for every new cell requires considerable human resources and time. This paper proposes a framework for 3G Long Term Evolution (LTE) that c...

In this paper, we present the simulation results of the comparative investigation of the performance of the wireless sensor network routing protocols based on different routing objective: energy-aware routing using PROWLER and RMASE. Our simulation results indicate that the energy-aware routing objective increases the network lifetime for the Adaptive Tree, Constrained Flooding and Real-Time ro...