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In this paper, an accurate analytical performance study of a multi-channel network is derived, based on the probability theory. Especially, we mathematically model the performance of a multi-channel network, such as a wireless or an optical WDM network, assuming both the collisions over the multiple channels and the destination conflicts. The receiver collisions phenomenon is extensively studied,...
In-band full-duplex radio technology enables simultaneous transmission and reception, which may double the throughput of half-duplex radio in one-to-one communication. Unfortunately, medium access control (MAC) protocols for the half-duplex radio hardly make use of the potential capacity of the full-duplex radio since simultaneous transmission and reception is limited when the receiver has no data...
Typically Underwater Sensor Networks (UWSNs) consist of sensor nodes that use acoustic signal for data transmission. Due to the nature of the environment where these networks are deployed, there is a need to implement a reliable, energy efficient, and propagation-delay aware MAC protocol. In this paper, the common factors affecting the performance of three contention-based MAC protocols for underwater...
The purpose of this amendment is to improve the IEEE 802.11(TM) wireless local area network (WLAN) user experience by providing significantly higher basic service set (BSS) throughput for existing WLAN application areas and to enable new market segments for operation below 6 GHz including distribution of multiple multimedia/data streams.
Distributed TDMA medium access protocol plays an important role in stabilizing the throughput under various network states. The major challenge of implementing such protocol lies in the difficulty of slot assignment. Previous works provide a variety of mechanisms to implement the collision-free slot assignment. However, when network topology changes frequently, existing approaches suffer from low...
Due to the agility and low-cost, small Unmanned Aerial Vehicle (UAV) has recently captured great attention of academia and industry. However, since the capability limitation of single device, an ad hoc network formed by small UAVs is very promising. But compared to ordinary ad hoc networks, because of the unmanned characteristic and the diversity of missions, the protocols of UAV ad hoc networks require...
Broadband signal transmission through communication channels in home environments is one of the interesting topics in the field of intelligent buildings. Building designers are interested in transferring multimedia content with minimum cost, energy consumption, and acceptable quality. Limitations and drawbacks of existing transmission systems such as coaxial cable, wireless transmission, etc., have...
Traffic safety and efficiency are the most important motivations for the rapid development of vehicular ad hoc network (VANET) technology. VANET is considered to provide the unified platform and solutions for the intelligent transportation system (ITS). In this paper, a novel method named spectrum penetration is proposed to improve the throughput of multi-channel MAC for VANET. Meanwhile, it can overcome...
This paper proposes a new Reverse Direction (RD) Medium Access Control (MAC) protocol to improve the throughput and energy efficiency of IEEE 802.11 Wireless Local Area Networks (WLANs). The proposed protocol allows a source device to transmit a burst of data frames to the intended destination device in a single channel access opportunity. After the successful reception of each data frame, the destination...
In this paper we propose a Multichannel based X-MAC protocol (MX-MAC) with the objective of eliminating hidden node problem of existing asynchronous X-MAC protocol, as well as reducing average packet delay. To address the hidden terminal problems, multi channel enables a receiver to send a preamble with next receiver ID on the control channel to notify its neighbors that an ongoing reception is in...
In this paper, an analytical framework is developed to study the performance of opportunistic channel bonding in IEEE 802.11 WLANs. Specifically, we consider a WLAN operating on multiple channels shared by both legacy users and IEEE 802.11ac users with channel bonding capability. By capturing the opportunistic channel bonding from the IEEE 802.11ac users in the primary channel and the random access...
Underwater sensor networks play a great role in research areas by gathering knowledge about the inaccessible parts of the underwater. The sensory nodes in the network aid us by performing real time data acquisition which is needed to forecast different natural calamities. However communication in underwater with high success rate is quiet challenging because of the nature of the environment. Due to...
In this paper, we present an efficient medium access control (MAC) protocol based on IEEE 802.11 DCF, which minimizes the unfairness problem of two way vehicle ad hoc networks. Geographically highly dynamic topology in vehicle ad hoc networks lead to unfairness problem. Unfairness problem has two aspects: higher velocity vehicles cannot transmit a minimum number of packets and lower velocity vehicles...
In this paper, we introduce a new scheme called Mutual Preamble Detection (MPD) to reduce the collision recovery time in broadband power line communication (BB-PLC) networks. Although latest BB- PLC products deliver a physical layer data rate of over 1000 Mbps, this is not efficiently translated into the medium access control (MAC) layer throughput due to several factors, including the long time intervals...
Energy in MAC protocols becomes an important research issue because sensor nodes are mostly take their power from batteries that are not easily to be recharged. The aim of this paper is to improve MAC protocol in underwater sensor networks by enhancing the performance of ALOHA protocol, which considered as one of the most popular MAC protocols. This work proposed a method for preserving the energy...
Wireless Nano sensor Networks (WNSNs) are enabling advanced nanotechnology applications in the medical, industrial, biomedical, military, and environmental fields. Nano-devices communicate in the Terahertz band and provide a very large transmission bit-rate at the cost of high propagation delay resulting in a short communication distance due to Terahertz band peculiarities. Thus, classical MAC protocols...
Modelling data flow in wireless networks is a complicated task, since network dynamics are frequently unpredictable. The situation is even harder in the case of Wireless Sensor Networks (WSNs). Thus, many researchers instead of modelling the microscopic behavior of each single node, they choose to model traffic flow macroscopically. Fluid dynamic principles provide researchers with a powerful tool...
The number of devices enhanced with wireless communication capabilities is increasing at a fast pace. Such increase has exacerbated the quest for efficient medium access control protocols. In fact, the possibility of providing concurrent access to multiple channels, thus increasing throughput and reducing channel access delays, has been widely investigated. Among the alternatives for providing multi-channel...
The fragmentation and aggregation (F&A) algorithm improves the throughput while ensuring the reliability in the MAC layer. To determining the optimal fragment size is a key issue of effectively operating the F&A algorithm. In this paper, the proposed method selects the optimal fragmented frame size and uses aggregation scheme based on various channel conditions. As a result the throughput...
The full duplex communication is a spotlighted technology as a most promising solution that can solve channel capacity problem in wireless network. In the future, the device to device(D2D) communication can be considered to reduce the load of network. Furthermore, the centralized network have advantages in collision ratio. For these reasons, we propose a novel centralized full duplex MAC protocol...
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