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The use of wireless technology to communicate has spread to a variety of devices. Traditional solutions based on the well known IEEE 802.11 struggle to cope with a large number of contending nodes. The need to improve throughput and meet QoS requirements has driven the quest for more elaborated channel access mechanisms. The main contribution of this work is to propose a fair and fast channel access...
Wireless networking enhanced with multiple transmitting channels has been considered to improve the utilization of the electromagnetic spectrum and to provide ways to accommodation the growing demand for connectivity. In this scenario, the use of a common control channel to coordinate the stations and networking resources is usually employed. This work evaluates the control channel capacity and its...
The radio spectrum is a finite resource and the current spectrum licensing model has led to a fenomenon known as spectrum scarcity. Several approaches have been presented in order to improve the effectiveness of spectrum utilization. This works main contribution is is to present an approach to opportunistic spectrum sensing and allocation focused on maximizing spectrum usage while minimizing communication...
The current spectrum allocation model aims to avoid interferences in licensed spectrum communications without further concerns regarding spectrum usage. Because the radio spectrum is a finite resource, several approaches have been presented in order to improve the effectiveness of its utilization. The main contribution of this work is to present an opportunistic approach to spectrum sensing and allocation...
The growing demand for mobile wireless access has stimulated the emergence of new communication technologies. Opportunistic Spectrum Access (OSA) is viewed as a promising alternative to overcome the problems caused by static spectrum assignment. Opportunistic access allows dynamic mapping of the transmission needs and communication opportunities. However, performing this task efficiently is not trivial...
This work presents a packet aggregation mechanism tailored for real time applications over wireless network environments. In the core of the proposed mechanism lies an elaborated packet holding time estimation. This estimation is used to allow for packet aggregation along a multihop path. The proposed mechanism was evaluated and compared with another prominent packet aggregation scheme. The simulation...
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