Energy Aware Medium Access Control Research Articles

On-Demand Energy Transfer and Energy-Aware Polling-Based MAC for Wireless Powered Sensor Networks.

To improve the performance of the wireless powered sensor network (WPSN), this paper proposes a frequency division duplex (FDD)-based on-demand energy transfer protocol and an energy-aware polling-based medium access control (MAC) protocol, called composite energy and data first (CEDF), by using the numbers of data packets and energy packets to determine polling priorities. The performance of the proposed MAC protocol, i.e., CEDF, along with the on-demand energy transfer protocol was evaluated through simulations, with comparison to the closely related protocols such as the round robin (RR) and data first (DF) polling protocols. Compared with RR and DF, our proposed CEDF performs much better in terms of throughput, data packet loss rate, and delay. Additionally, the doubly near–far problem in WPSNs under our proposed on-demand energy transfer protocol and CEDF was investigated to come up with good solutions to alleviate such a problem.

Energy aware medium access control for CPS-based wireless networks

Cyber physical systems CPSs are an emerging area of research. Medium access control MAC plays a major role in improving the performance of a wireless system involved in CPS. In this paper, we try to refine the process of MAC to increase the performance level of CPS-based wireless networks. Though CPS is a combination of different networks, an attempt had been made to create flexibility in the traditional backoff mechanism. We have implemented an energy efficient backoff methodology called as energy hashed virtual backoff algorithm EHVBA for a CPS-based wireless networks. This algorithm uses energy as one of the parameters in the existing VBA-CS to increase the CPS's efficacy. However there is a need to bring adaptability to the conventional backoff process in wireless networks. The proposed approach is compared with the similar existing approach in a heterogeneous network's environment. Components like MAC efficiency and energy consumption are elevated to a certain percentage comparatively with existing procedure.

Energy-aware adaptive topology adjustment in wireless body area networks

Wireless body area networks (WBANs) represent a key emerging technology to resolve the connection issues on, in or around the human body. One of the most important and challenging issues in WBANs is to maximize the network lifetime. Employing additional relaying node to save energy was considered in the literatures available. Different from the related work, we propose a novel adaptive MAC protocol for WBANs named Network Longevity Enhancement by Energy Aware medium access control Protocol (NLEEAP), which reduces energy consumption without introducing additional devices. The procedures in NLEEAP consist of relay request, relay response and superframe adjustment. The relay operation is initiated when the shortage of a node's residual energy occurs. Once the relay succeeds, NLEEAP smoothly switches the network topology from single-hop to multi-hop. Simulations are conducted and the results show the superiority of NLEEAP in energy efficiency compared with that of existing standard of IEEE 802.15.4.

Towards a classification of energy aware MAC protocols for wireless sensor networks

AbstractPower management is an important issue in wireless sensor networks (WSNs) because wireless sensor nodes are usually battery powered, and an efficient use of the available battery power becomes an important concern specially for those applications where the system is expected to operate for long durations. This necessity for energy efficient operation of a WSN has prompted the development of new protocols in all layers of the communication stack. Provided that, the radio transceiver is the most power consuming component of a typical sensor node, large gains can be achieved at the link layer where the medium access control (MAC) protocol controls the usage of the radio transceiver unit.MAC protocols for sensor networks differ greatly from typical wireless networks access protocols in many issues. MAC protocols for sensor networks must have built‐in power conservation, mobility management, and failure recovery strategies. Furthermore, sensor MAC protocols should make performance trade‐off between latency and throughput for a reduction in energy consumption to maximize the lifetime of the network. This is in general achieved through duty cycling the radio transceiver.Many MAC protocols with different objectives were proposed for wireless sensor networks in the literature. Most of these protocols take into account the energy efficiency as a main objective. There is much more innovative work should be done at the MAC layer to address the hard unsolved problems. In this paper, we first outline and discuss the specific requirements and design trade‐offs of a typical wireless sensor MAC protocol by describing the properties of WSN that affect the design of MAC layer protocols. Then, a typical collection of wireless sensor MAC protocols presented in the literature are surveyed, classified, and described emphasizing their advantages and disadvantages whenever possible. Finally, we present research directions and identify open issues for future medium access research. Copyright © 2009 John Wiley & Sons, Ltd.

Distributed and Energy-Aware MAC for Differentiated Services Wireless Packet Networks: A General Queuing Analytical Framework

We present a novel queuing analytical framework for the performance evaluation of a distributed and energy-aware medium access control (MAC) protocol for wireless packet data networks with service differentiation. Specifically, we consider a node (both buffer-limited and energy-limited) in the network with two different types of traffic, namely, high-priority and low-priority traffic, and model the node as a MAP (Markovian arrival process)/PH (phase-type)/1/K nonpreemptive priority queue. The MAC layer in the node is modeled as a server and a vacation queuing model is used to model the sleep and wakeup mechanism of the server. We study standard exhaustive and number-limited exhaustive vacation models both in multiple vacation case. A setup time for the head-of-line packet in the queue is considered, which abstracts the contention and the back-off mechanism of the MAC protocol in the node. A nonideal wireless channel model is also considered, which enables us to investigate the effects of packet transmission errors on the performance behavior of the system. After obtaining the stationary distribution of the system using the matrix-geometric method, we study the performance indices, such as packet dropping probability, access delay, and queue length distribution, for high-priority packets as well as the energy saving factor at the node. Taking into account the bursty traffic arrival (modeled as MAP) and, therefore, the nonsaturation case for the queuing analysis of the MAC protocol, using phase-type distribution for both the service and the vacation processes, and combining the priority queuing model with the vacation queuing model make the analysis very general and comprehensive. Typical numerical results obtained from the analytical model are presented and validated by extensive simulations. Also, we show how the optimal MAC parameters can be obtained by using numerical optimization