In order to enhance the transmission rate, multiple channels and multiple transceivers are employed in wireless mesh networks (WMNs). However, the bandwidth utilization rate is still low, and it is hard to design efficiency MAC. There are mainly three reasons. The first reason is that there are different kinds of nodes in WMN: some nodes are single transceiver and some nodes are multiple transc...

In recent years, several MAC (Medium Access Control) protocols using directional antennas have been proposed for mobile ad hoc networks (MANETs) including our proposed MAC protocol called SWAMP (Smart antennas based Wider-range Access MAC Protocol). These are typically referred to as directional MAC protocols. This paper first summarizes the proposed directional MAC protocols and outlines these...

As wireless sensor network applications are becoming more complex, the need for a versatile medium access control that is able to deliver high data rates is essential. In event-based systems, sensor nodes spend most of their time at sleep state waiting for an event to occur. When an event is detected, sensor nodes experience a short abrupt period of high data contention where the data packets a...

Cognitive radio technology has been developed in recent years to make efficient use of the wireless spectrum especially for opportunistic spectrum access. Cognitive radio technology enables the secondary (cognitive) users to use the unused licensed spectrum of the primary users. Medium Access Control (MAC) protocol plays a vital role in spectrum utilization, primary user’s (PU) interference man...

he ability to communicate with anyone on the planet from anywhere on the planet has been mankind’s dream for a long time. Wireless is the only medium that can enable such untethered communication. With the recent advances in VLSI and wireless technologies, it is now possible to build high-speed wireless systems that are cheap as well as easy to install and operate. However, the wireless medium ...

Ultra wide band (UWB) technology has received increasing recognition in recent years for its potential applications beyond radar technology to communication networks. UWB is a spread spectrum technology that requires careful coordination among communicating nodes to jointly control link power and transmission rates. Here, we present ultra wide band MAC (U-MAC), an adaptive medium access control...

Wireless sensor networks (WSNs) are new generation of wireless networks which have many potential applications and unique challenges. Some of their most important problems are their limited resources, independent and autonomous operation and dynamic topology. Also, maximum of energy consumption into these networks is occurred when data transmission. In recent decade, researchers have been tryin...

Existing wireless MAC standards are known to have fairness problems. In this paper, we ask a more fundamental question: should fairness be a property of medium access, or in other words, are we placing the blame on the right place? We argue that fairness is a property of applications and must be implemented by applications. Medium access control should simply provide mechanisms for application-...

Interference is one of the foremost problems in wireless communication which leads to various unique design challenges for wireless networks. Wireless medium access control (MAC) has to be specifically designed to resolve contention in the presence of interference. As a result, an important technique, the random access protocol, has emerged to address the contention issue. This protocol is the ...

Sensor networks require robust and efficient communication protocols to maximise the network lifetime. Radio irregularity, channel fading and interference results in larger energy consumption and latency for packet transmission over wireless channel. Cooperative multi-input multi-output (MIMO) schemes can combat the fading effects in wireless sensor network (WSN) and can significantly improve t...