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The VST-TDMA access protocol has shown to have many advantages over existing protocols in centralized (star) wireless network architectures. As most data-link layer protocols, it does not have a recovery feature as data integrity is supervised by the connection-oriented transport protocols. Nevertheless, VST-TDMA possesses the flexibility to easily incorporate a retransmission feature that allows...
Time division multiple access (TDMA) schemes are intensively being the main solution to provide predictability and timeliness in data communication systems requiring real-time operation. In this paper we investigate the problem of low efficiency and channel utilization, common to the TDMA algorithms. As a solution, we propose a general slot stealing version of TDMA, able to significantly increase...
Wireless Sensor Network (WSN) has been widely used in many important areas. MAC protocols have a significant effect on the function of WSN. This paper introduced various important MAC protocols, analyzed the fundamental mechanism of each MAC protocol in details, and compared the characteristics and performances of each MAC protocol. Finally, the future research strategies and trends of MAC protocols...
Plant automation and control are mission-critical applications and require timely and reliable data delivery, which is difficult to provide using a wireless technology. This is especially more difficult in industrial environments with harsh radio conditions. In this paper we present a dynamic and distributed topology control algorithm for Wireless Sensor Networks for use in performance critical environments...
Millimeter-wave communication is an advantageous frequency range because it is unlicensed and it is viable for high-throughput short-range transmission applications. This work focuses on an energy-efficient Medium Access Control (MAC) protocol for very-high-throughput millimeter-wave (mm-wave) wireless sensor communication networks (VHT-MSCNs) based on a hybrid multiple access technique.
We focus on a new class of home networking applications that enable wireless communication between multimedia devices using the WiMedia MAC protocol. Applications like streaming video from DVD players to HDTVs, generate high data rates and can easily saturate the bandwidth even at the rates provided by UWB transmissions. Thus we need to enhance the MAC layer to improve bandwidth utilization and efficiently...
Social ad-hoc networks can be composed of a large number of tiny, wireless, battery-powered nodes, and exhibit arbitrary mobility. We aim to enable the execution of distributed applications that depend on capturing network dynamics across large-scale social ad-hoc networks. Conservation of the nodes' fixed energy budget is the chief concern in all design decisions, and necessitates that wireless communication...
This paper proposes a technique for topology control (TC) of wireless nodes to meet Quality of Service (QoS) requirements between source and destination node pairs. The nodes are assumed to use a TDMA (Time Division Multiple Access) based MAC (Medium Access Control) layer. Given a set of QoS requirements, a set of wireless nodes and their initial positions, the goal is to find a topology of the nodes...
Wireless Body Sensor Networks (WBSNs) have recently received a lot of research interests due to their wide applications in healthcare, security, sports and entertainment. Accurate WBSNs localization is a fundamental problem to be overcome to enable the development of effective location-aware applications. This paper introduces and investigates the performance of WBSN localization algorithms using...
Wireless sensor networks (WSN) are considered the sensing technology of the future. A major problem for many sensor network applications is determining the most efficient way of conserving the energy of the power source. Thus Medium Access Control (MAC) is introduced to solve the problem. In this paper we give an analysis of some characters of WSN and give a short introduction of some recent typical...
In this paper, the TDMA dynamic allocation of protocol - slot ALOHA algorithm is the basic concept, the whole design use the GPS to provide accurate real-time clock for the whole system, combine wireless communication module to build a wireless network, and apply to UAVs communications. The whole system achieves the various nodes (UAV) real-time communication between a low collision rate and high...
Low-cost non-intrusive wireless sensor network is ideal for high-fidelity data center monitoring and helping improve energy efficiency. However, the stringent quality of service (QoS) requirements such as real-time data delivery together with the dynamic nature of low-power wireless communication render traditional MAC protocols inapplicable to high-fidelity data center sensing networks. In this paper,...
The wireless communication technologies, such as wireless sensor network, can bring great economic benefits to industrial plants. But the open channel and multi-hop network topology will influence its real-time and reliable performance. Funneling effect is a kind of congestion caused by the wireless hop-by-hop and many-to-one networks. IEEE802.15.4 is a wireless personal area network standard that...
This paper presents a novel hierarchical and grid based reconfigurable optical-wireless network (GROW-Net) architecture. GROW-Net supports scalable and flexible integration of a large scale wireless mesh network in a municipal environment. Under the GROW-Net architecture, a joint evolution strategy is proposed to allow graceful upgrades in both optical backbone and wireless mesh network. To alleviate...
Wireless body area networks (WBANs) enable placement of tiny biomedical sensors on or inside the human body to monitor vital body signs. The IEEE 802.15.6 task group is developing a standard to optimize WBAN performance by defining the physical layer (PHY) and media access control (MAC) layer specifications. In this paper an energy efficient MAC protocol (BodyMAC) is proposed. It uses flexible bandwidth...
Due to lack of inexpensive infrastructure rural communities suffer from inadequate Internet access, which is gradually widening the digital division between town and countryside, resulting in degrading both social communication and business advancements. In order to examine the feasibility of constructing a community mesh network using partial off-the-shelf hardware and software components, our research...
This paper presents a comparative study of existing real-time MAC layer protocols for wireless sensor networks. Then, a new real-Time MAC protocol is presented that is based on a general purpose MAC protocol, called S-MAC. While medium access strategy in S-MAC is based on contention and back-off schemes, protocol proposed in this paper uses feedback approach as a medium access strategy. As a result...
Cognitive radio technology is widely accepted as an efficient approach to solve the problem that the wireless spectrum has been getting scarcer and scarcer due to the rapid growth in the ubiquitous wireless applications. Several cognitive medium access control (MAC) protocols have been proposed for the secondary users (non-licensed users) to take advantage of the vacant channels whenever they are...
The last few decades have seen considerable research progress in microelectronics and integrated circuits, system-on-chip design, wireless communication, and sensor technology. This progress has enabled the seamless integration of autonomous wireless sensor nodes around a human body to create a Body Sensor Network (BSN). The development of a proactive and ambulatory BSN induces a number of enormous...
In this paper we evaluate an algorithm to distributing resources provided by the access point at the MAC layer in wireless networks. We consider a TDMA/FDD-based mechanism. System model is designed and tested for a wireless ATM networks architecture. In fact, the QoS characterising ATM technology provides the ability to well transmit multiple traffic types and treat every one according to some generic...
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