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This paper presents a time division multiple access MAC protocol that is specifically designed for applications requiring periodic sensing of the sensor field. Numerical analysis is conducted to investigate the optimum transmission scheduling based on the signal to interference-noise-ratio (SINR) for ground level propagation model applied on wireless chain topology. The optimised transmission schedule...
The abundance of unlicensed frequency resources in the mm-Wave frequency range, especially round 60 GHz bands, have a great potential to fulfill the increasing demands of high speed wireless applications. In mm-Wave wireless communication systems, directional transmission technologies become an inherent feature to compensate the high pathloss. The frame aggregation scheme is designed to maximize network...
Wireless Body Area Network (WBAN) consists of a set of sensor nodes deployed on or implanted in the body and these nodes send sensed physiological data to the personal assistant. Some of these sensor nodes can be located far from the personal assistant or due to body posture the link between the node and the personal assistant is obstructed and so require an intermediate node to help relay their data...
In recent years, the use of multi-channel MAC protocols in the Wireless Sensor Networks has attracted the attention of many researchers. In this paper, we analyze the different techniques that are used in multi-channel MAC protocols proposed for WSNs. These protocols often use either a centralized or a distributed manner to select and allocate channels. We present HMC-MAC, a Hybrid Multi-Channel MAC...
While underwater acoustic sensor networks (UWSN) are still considered to be in their development phase, professional users are starting to understand their future potential. For example, large areas encircling offshore oil installations need to be environmentally supervised. UWSNs consisting of a large number of sensor nodes can present a viable solution to this challenge. One way to build such networks...
Ad hoc networks suffer from unfairness when multiple flows exist in the same interference region. The unfair channel distribution among competing flows is due to the random exponential back off algorithm used by the IEEE 802.11 Medium Access Control (MAC) protocol. The protocol can lead to unfair channel utilization among different flows, as some of the nodes may capture the channel for a long period...
In Wireless Sensor Network MAC protocol designs, end to end latency is a field that many researches often focus on. RMAC, as a synchronizing MAC protocol, shows great advantage in reducing end to end latency than other MAC protocols. However, the performance of RMAC degenerates when encountered with interference hotspots. In this paper, we present an enhanced MAC protocol called SRMAC, which is derived...
The emergence of high-density wireless local area network (WLAN) deployments in recent years is a testament to the insatiable demands for wireless broadband services. The increased density of WLAN deployments brings with it the potential of increased capacity, extended coverage, and exciting new applications. However, the corresponding increase in contention and interference can significantly degrade...
Directional antennas have the potential to enhance the performance of wireless networks. However, exploiting their capabilities requires channel access schemes specifically designed for this purpose. Among the numerous applications of sensor networks, roadside and highway monitoring can benefit from the use of directional antennas due to increased communication ranges between the sensor nodes, reduction...
In wireless sensor network research, simulation is one of the most important approaches to evaluate system or protocol performance. The accuracy of estimated results depends on selected simulation parameters. In existing analysis on wireless sensor network, simple interference models are used in simulations, which only take interference signals from nodes in a particular range into account. Based...
Much of the focus in dynamic spectrum access has been on detection of primary users prior to channel occupation by secondary users as well as expediently vacating channels in the event that primary users reappear. These efforts are necessary, though reactionary in nature. We propose that, in addition to these efforts, the topology of the secondary network be optimized in order to proactively minimize...
The acknowledgment strategy has great potential to increase the TCP throughput when it runs over 802.11 MAC protocol. In particular, TCP acknowledgments carry out an extensive number of medium accesses as they compete in the same route as data packets for media. As the load increases, the well-known hidden terminal effects caused by interference between ACK and data packets in MAC layer can degrade...
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