Multichannel media access control (MAC) protocols have been widely considered for future mobile ad hoc networks and various wireless data networks. However, ALOHA-based protocols have been extensively studied in current researches for their simplicities both in design and analysis. To cope with co-existing multiple systems under the cognitive radio (CR) paradigm, we introduce the cognition capa...

Underwater Acoustic Wireless Sensor Network (UAWSN) uses acoustic signals to transmit data. Acoustic signals in underwater environment have high bit error rate, long propagation delay and limited bandwidth. Another constraint in UWASN is energy. Due to these constraints, design of energy and bandwidth efficient and propagation delay aware MAC protocol is a great challenge in UWASN. Underwater s...

In this paper, we propose a hybrid medium access control protocol (H-MAC) for wireless sensor networks. It is based on the IEEE 802.11’s power saving mechanism (PSM) and slotted aloha, and utilizes multiple slots dynamically to improve performance. Existing MAC protocols for sensor networks reduce energy consumptions by introducing variation in an active/sleep mechanism. But they may not provid...

In this paper cluster-based hybrid MAC (CB-HMAC) protocol, based on IEEE 802.15.4 is proposed for smart home networks. The CB-HMAC specially designed short packet transmission in a dense network environment. Simulation results show that the more energy-efficient than other medium access control (MAC) protocols without sacrificing much delay and throughput.

In this paper, we present a class of collision-free medium access control (MAC) protocols based on the request-to-send/object-to-send/clearto-send (ROC) scheme. ROC-based protocols can solve a number of problems in ad hoc mobile wireless networks. They also enable multicast transmissions, variable-radius transmissions, low-power mobile devices, and MAC-layer supports for QoS guarantees.

The application of directional antennas in the mobile devices of wireless ad hoc networks has the potential to increase the network connectivity and capacity. However, new solutions for medium access control (MAC) are needed. This paper provides a survey and overview of recently proposed MAC protocols for this scenario. We summarize problems specific to this setup and categorize proposed protoc...

Cognitive radio represents an efficient way to utilize the available spectrum in Wireless networks by offering the unlicensed users (Secondary users) the opportunity to use an available spectrum for the licensed users (Primary users) when they are not active. In this paper, some cognitive MAC protocols are discussed with a brief introduction to Multi Channel MAC protocols.

Ultra-wideband (UWB) is an appealing transmission technology for short-range, bandwidth demanded wireless communications. With the data rate of several hundred megabits per second, UWB demonstrates great potential in supporting multimedia streams such as high-definition television (HDTV), voice over Internet Protocol (VoIP), and console gaming in office or home networks, known as the wireless p...

Underwater Acoustic Sensor Networks (UWASNs) has gain a widespread recognition recently due to some technological breakthrough, and thus, beginning a new era of research in the industry with potential for vast applications that are important to our livelihood. Despite all these potentials, deploying a reliable UWASNs based systems still remain very far from perfect and there are only limited ex...

In this paper, we propose TB-MAC (Threshold-Based MAC), which has been designed to consider various network traffic conditions while providing energy efficiency in a wireless sensor networks. Existing MAC protocols for sensor networks attempt to solve the energy consumption problem caused by idle listening using an active/sleep duty cycle. Since there are various traffic conditions, however, th...