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Author: Publisher: ISBN: Category : Languages : en Pages : 81
Book Description
As wireless technology becomes increasingly pervasive, there is a need for decentralized medium access control (MAC) protocols that satisfy user requirements at an acceptable cost of complexity and energ consumption. Hardware improvements have provided for multi-channel transceivers and leveraging this benefit necessitates further work in higher layer protocols. As devices get smaller leading to large networks formed of tiny sensor motes, the allocation of available channels without a central authority and their subsequent arbitration is a challenging task. In our work, we address this by first devising a channel allocation protocol (DCA) that ensures interference-free communication. We then propose a multi-channel MAC, C-MAC that enables energy efficient data transfer without tradeoffs in latency or throughput, and allows nodes to remain in their low-power sleep period for the maximum possible time. Apart from sensor networks, we have also analyzed the case for wireless local area networks (WLANs) that are the default providers of community and enterprise level internet connectivity. A judicious choice of the operational channel based on current network conditions can greatly improve performance in randomly deployed or hotspot areas. Our analytical estimation of interference allows each access point (AP) to independently arrive at the best channel, thus resulting in fewer re-transmissions due to neighboring traffic. For all the proposed schemes, a thorough performance evaluation has been undertaken and results reveal major improvement in performance for both WLAN and sensor networks, thus proving the viability of multi-channel communication models.
Author: Publisher: ISBN: Category : Languages : en Pages : 81
Book Description
As wireless technology becomes increasingly pervasive, there is a need for decentralized medium access control (MAC) protocols that satisfy user requirements at an acceptable cost of complexity and energ consumption. Hardware improvements have provided for multi-channel transceivers and leveraging this benefit necessitates further work in higher layer protocols. As devices get smaller leading to large networks formed of tiny sensor motes, the allocation of available channels without a central authority and their subsequent arbitration is a challenging task. In our work, we address this by first devising a channel allocation protocol (DCA) that ensures interference-free communication. We then propose a multi-channel MAC, C-MAC that enables energy efficient data transfer without tradeoffs in latency or throughput, and allows nodes to remain in their low-power sleep period for the maximum possible time. Apart from sensor networks, we have also analyzed the case for wireless local area networks (WLANs) that are the default providers of community and enterprise level internet connectivity. A judicious choice of the operational channel based on current network conditions can greatly improve performance in randomly deployed or hotspot areas. Our analytical estimation of interference allows each access point (AP) to independently arrive at the best channel, thus resulting in fewer re-transmissions due to neighboring traffic. For all the proposed schemes, a thorough performance evaluation has been undertaken and results reveal major improvement in performance for both WLAN and sensor networks, thus proving the viability of multi-channel communication models.
Author: Yuhan Moon Publisher: ISBN: Category : Ad hoc networks (Computer networks) Languages : en Pages : 151
Book Description
Today, many wireless networks are single-channel systems. However, as the interest in wireless services increases, the contention by nodes to occupy the medium is more intense and interference worsens. One direction with the potential to increase system throughput is multi-channel systems. Multi-channel systems have been shown to reduce collisions and increase concurrency thus producing better bandwidth usage. However, the well-known hidden- and exposed-terminal problems inherited from single-channel systems remain, and a new channel selection problem is introduced. In this dissertation, Multi-channel medium access control (MAC) protocols are proposed for mobile ad hoc networks (MANETs) for nodes equipped with a single half-duplex transceiver, using more sophisticated physical layer technologies. These include code division multiple access (CDMA), orthogonal frequency division multiple access (OFDMA), and diversity. CDMA increases channel reuse, while OFDMA enables communication by multiple users in parallel. There is a challenge to using each technology in MANETs, where there is no fixed infrastructure or centralized control. CDMA suffers from the near-far problem, while OFDMA requires channel synchronization to decode the signal. As a result CDMA and OFDMA are not yet widely used. Cooperative (diversity) mechanisms provide vital information to facilitate communication set-up between source-destination node pairs and help overcome limitations of physical layer technologies in MANETs. In this dissertation, the Cooperative CDMA-based Multi-channel MAC (CCM-MAC) protocol uses CDMA to enable concurrent transmissions on each channel. The Power-controlled CDMA-based Multi-channel MAC (PCC-MAC) protocol uses transmission power control at each node and mitigates collisions of control packets on the control channel by using different sizes of the spreading factor to have different processing gains for the control signals. The Cooperative Dual-access Multi-channel MAC (CDM-MAC) protocol combines the use of OFDMA and CDMA and minimizes channel interference by a resolvable balanced incomplete block design (BIBD). In each protocol, cooperating nodes help reduce the incidence of the multi-channel hidden- and exposed-terminal and help address the near-far problem of CDMA by supplying information. Simulation results show that each of the proposed protocols achieve significantly better system performance when compared to IEEE 802.11, other multi-channel protocols, and another protocol CDMA-based.
Author: Hongyi Wu Publisher: Nova Publishers ISBN: 9781600219443 Category : Computers Languages : en Pages : 662
Book Description
Wireless technologies and applications are becoming one of the fastest growing and most promising areas in recent years. To accommodate data transmission by multiple stations sharing the scarce wireless bandwidth, a medium access control (MAC) protocol plays a crucial role in scheduling packet transmission fairly and efficiently. The emerging wireless networks, such as ad-hoc networks, sensor networks or mesh networks, are mostly multi-hop based and in distributed manner, which brings a lot of problems and challenges in designing fine-tuned MAC protocols tailored for modern wireless network. In this book, the authors give complete and in-depth overviews to the classic medium access control algorithms and the related protocols, as well as their applications in various wireless data networks especially the most successful Wireless Local Area Networks (WLAN). The book consists of three major parts. Part I of this book, including Chapters 1-7, is emphasising on the fundamentals of medium access control algorithms and protocols. Chapter 1 provides an introduction to the wireless networks, such as overview of wireless networks, problems and challenges of the wireless networks, and the classifications of MAC protocols as well as the performance metrics. Chapter 2 introduces important collision resolution algorithms applied in medium access controls, for example, the splitting algorithm and the backoff algorithm. Chapter 3 reviews the hybrid access control algorithms that combine both contention and allocation schemes. A series of important collision avoidance schemes are introduced in Chapters 4-7 respectively, with a specific design goal covered in each chapter. Chapter 4 focuses on the multi-channel MAC protocols for collision avoidance; Chapter 5 introduces the concepts of power control and power management in medium access control and how they can be applied in MAC protocol design; Chapter 6 presents how to provide Quality-of- Service (QoS) to multimedia wireless networks, in either centralised or distributed manner; and Chapter 7 explains how the smart antennas can be applied in the medium access control to provide high channel throughput and low packet collision.
Author: Hoi-Sheung Wilson So Publisher: ISBN: 9780542826597 Category : Languages : en Pages : 216
Book Description
In summary, through analysis, simulation, and experiments, we show that it is possible to increase throughput of an ad hoc wireless network by using multiple channels efficiently even though each node can only use one channel at a time.
Author: Divya Sardana Publisher: ISBN: Category : Languages : en Pages : 81
Book Description
Ad hoc networks have become a popular type of wireless network in the present world. In order to match with the increasing demand of ad hoc networks, a lot of research is being done towards solving the issues related to the design of ad hoc networks. The design of a Medium Access Control (MAC) protocol for ad hoc networks is one such issue. Traditional MAC protocols involve the use of a single channel as the wireless medium. However, throughput of a single channel MAC degrades as the node traffic in the system increases. One of the interesting approaches towards alleviating this problem is the use of more than one channel as the underlying medium. The use of multiple channels allows more than one communication to take place simultaneously thereby improving the throughput of the system. Multiple channels have been mostly used in the literature by assigning one of the channels as the control channel used only for control packet transfer and the rest of the channels as data channels used for Data packet transfer. Using such an approach towards designing a multi-channel MAC protocol leads to a poor utilization of the available bandwidth. In this thesis, we propose a multi-channel MAC protocol called as Control-channel Reuse based Multi-channel MAC (CRM-MAC) which aims at improving the overall bandwidth utilization. We illustrate the efficacy of our protocol through elaborate simulations.
Author: Musa Aykut Canbolat Publisher: ISBN: Category : Electronic dissertations Languages : en Pages : 74
Book Description
Although IEEE 802.11a/b/g standards allow use of multiple channels, only a single channel is popularly used, due to the lack of efficient protocols that enable use of Multiple Channels. There are some papers challenging this problem. Some of them have requirements that will increase the cost, like requirement of multiple transceivers. Some others address the problem with single transceivers, but are very hard to be employed in highly mobile Ad Hoc networks due to network-wide synchronization requirements. In this Thesis, multiple channel use in a wireless network with single transceiver nodes is addressed, and attempted to be solved with a new efficient Ad Hoc network MAC protocol, which intends to remove the requirement of network-wide synchronization.
Author: Asimakis E. Tzamaloukas Publisher: ISBN: Category : Computer network protocols Languages : en Pages : 314
Book Description
This thesis focuses on the medium access control (MAC) layer. Many MAC protocols for wireless networks proposed or implemented to date are based on collision-avoidance handshakes between sender and receiver. The key objective of collision-avoidance handshakes is reducing or eliminating the collision of data packets from a source at any given receiver due to interference from packets from other sources. In the vast majority of these protocols, including the IEEE 802.11 standard, the handshake is sender-initiated, in that the sender asks the receiver for permission to transmit using a short control packet, and transmits only after the receiver sends a short clear-to-send notification. There are two main objectives in this work: analyze the effect of reversing the collision-avoidance handshake as a way to improve the performance of MAC protocols under any conditions in the network, and design MAC protocols that provide correct floor acquisition without carrier sensing or code pre-assignment. We show that receiver-initiated collision-avoidance MAC protocols not only outperform any sender-initiated ones, but also guarantee collision-free data transmission and seamless support for mobility by using simple, low-cost wireless radios. We study the effect of persistent carrier sensing in receiver- as well as sender-initiated MAC protocols. We extend our work to multi-channel radios and introduce novel collision-avoidance MAC protocols that eliminate the need for carrier sensing and code pre-assignment, and improve the utilization of the medium in the presence of unicast, multicast and broadcast traffic.
Author: Raphael Rom Publisher: Springer Science & Business Media ISBN: 1461234026 Category : Technology & Engineering Languages : en Pages : 179
Book Description
Computer communication networks have come of age. Today, there is hardly any professional, particularly in engineering, that has not been the user of such a network. This proliferation requires the thorough understanding of the behavior of networks by those who are responsible for their operation as well as by those whose task it is to design such networks. This is probably the reason for the large number of books, monographs, and articles treating relevant issues, problems, and solutions in this field. Among all computer network architectures, those based on broadcast mul tiple access channels stand out in their uniqueness. These networks appear naturally in environments requiring user mobility where the use of any fixed wiring is impossible and a wireless channel is the only available option. Because of their desirable characteristics multiple access networks are now used even in environments where a wired point-to-point network could have been installed. The understanding of the operation of multiple access network through their performance analysis is the focus of this book.
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Author: 
Author: Yuhan Moon
Author: Hongyi Wu
Author: 
Author: Hoi-Sheung Wilson So
Author: Venkatesh Rajendran
Author: Divya Sardana
Author: Musa Aykut Canbolat
Author: Asimakis E. Tzamaloukas
Author: Raphael Rom