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Author: Kartikeya Tripathi Publisher: ISBN: Category : Languages : en Pages :
Book Description
A Markovian framework is also developed for the powerline domain and is used to present such modifications in the existing protocol for medium access as are shown to produce consistently optimal performance under all conditions of network load.
Author: Kartikeya Tripathi Publisher: ISBN: Category : Languages : en Pages :
Book Description
A Markovian framework is also developed for the powerline domain and is used to present such modifications in the existing protocol for medium access as are shown to produce consistently optimal performance under all conditions of network load.
Author: Publisher: ISBN: Category : Languages : en Pages : 287
Book Description
The past decade has seen an explosive growth in wireless products such as cellular phones and pagers. The zeal with which consumers are using these products and services is a testament to our society's desire to remain in touch while on the move. Computing systems are now reaping the benefits of this quest for mobility. Since their inception in the late 1970's FrE80, GfB79, wireless local area networks have been thrust to the forefront of networking alternatives especially when confronted with difficult or impossible obstacles sometimes associated with wired networks such as routing cables and spontaneous ad hoc LANs. Before a wireless LAN is considered, system capabilities, cost, and limitations must be given due consideration. To gain user acceptance, a wireless LAN must sustain data rates comparable with wired networks, gracefully control the inherently larger number of bit errors, and allow inter-operability with heterogeneous vendor products. Pivotal to network performance, the medium access control (MAC) is the protocol used by all stations within the network to control when each station is allowed to transmit and ultimately determines the degree to which the aforementioned factors satisfy the user. Current wireless LANs are artificially limiting their performance by using a wired LAN MAC model. This 'worst case' model assumes that once the medium suffers a performance degradation, it cannot be improved.
Author: Barry E. Mullins Publisher: ISBN: 9781423579441 Category : Languages : en Pages : 287
Book Description
The past decade has seen an explosive growth in wireless products such as cellular phones and pagers. The zeal with which consumers are using these products and services is a testament to our society's desire to remain in touch while on the move. Computing systems are now reaping the benefits of this quest for mobility. Since their inception in the late 1970's FrE80, GfB79, wireless local area networks have been thrust to the forefront of networking alternatives especially when confronted with difficult or impossible obstacles sometimes associated with wired networks such as routing cables and spontaneous ad hoc LANs. Before a wireless LAN is considered, system capabilities, cost, and limitations must be given due consideration. To gain user acceptance, a wireless LAN must sustain data rates comparable with wired networks, gracefully control the inherently larger number of bit errors, and allow inter-operability with heterogeneous vendor products. Pivotal to network performance, the medium access control (MAC) is the protocol used by all stations within the network to control when each station is allowed to transmit and ultimately determines the degree to which the aforementioned factors satisfy the user. Current wireless LANs are artificially limiting their performance by using a wired LAN MAC model. This 'worst case' model assumes that once the medium suffers a performance degradation, it cannot be improved.
Author: Ping Wang Publisher: Springer Science & Business Media ISBN: 1461466024 Category : Computers Languages : en Pages : 117
Book Description
This brief investigates distributed medium access control (MAC) with QoS provisioning for both single- and multi-hop wireless networks including wireless local area networks (WLANs), wireless ad hoc networks, and wireless mesh networks. For WLANs, an efficient MAC scheme and a call admission control algorithm are presented to provide guaranteed QoS for voice traffic and, at the same time, increase the voice capacity significantly compared with the current WLAN standard. In addition, a novel token-based scheduling scheme is proposed to provide great flexibility and facility to the network service provider for service class management. Also proposed is a novel busy-tone based distributed MAC scheme for wireless ad hoc networks and a collision-free MAC scheme for wireless mesh networks, respectively, taking the different network characteristics into consideration. The proposed schemes enhance the QoS provisioning capability to real-time traffic and, at the same time, significantly improve the system throughput and fairness performance for data traffic, as compared with the most popular IEEE 802.11 MAC scheme.
Author: Halid Hrasnica Publisher: John Wiley & Sons ISBN: 0470857420 Category : Technology & Engineering Languages : en Pages : 290
Book Description
Broadband Powerline Communications: Network Design covers the applications of broadband PLC systems in low-voltage supply networks, a promising candidate for the realization of cost effective solutions for “last mile” communications networks. There are many activities surrounding the development and application of PLC technology in the access area, particularly because of strong interest of new network providers after the deregulation of telecommunications market. Nowadays, there are no existing standards for broadband PLC networks, which use a frequency range up to 30 MHz. This book includes relevant and timely information regarding broadband PLC systems and especially PLC access networks and contributions to the design aspects of broadband PLC access systems and their network components. This book: Offers explanations on how broadband PLC networks are realized, what the important characteristics for the transmission on electrical power grids are, and which implementation solutions have been recently considered for the realization of broadband PLC systems. Considers various system realizations, disturbance scenarios and their impact the transmission in PLC networks, electro-magnetic compatibility, applied modulation schemes, coding, and error handling methods. Pays particular attention to the specifics of the PLC MAC layer and its protocols, as well as the modelling and performance evaluation of broadband PLC networks.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Recent advances in portable computing and wireless technologies are opening up exciting possibilities for the future of wireless mobile networking. More notably, Wireless Local and Personal Area Networks (WLANs and WPANs) technologies are expected to revolutionize the way we live. Given their unprecedented importance, in this dissertation we investigate and suggest new solutions in the context of WLANs and WPANs systems. In the world of WLANs, we study its major representative, namely, the IEEE standard 802.11, while we explore the Bluetooth technology as it is the most prominent solution in the world of WPANs. In the field of Bluetooth, we have identified key issues and made considerable contributions. We have carried out a detailed analytical and simulation analysis of radio interference impact on Bluetooth and proposed ways of mitigating it, such as a novel interference-aware packet segmentation protocol (IBLUES). Moreover, we also introduce an integrated IEEE 802.11 and Bluetooth architecture (BlueStar), which enables efficient information interchange between these two widely used technologies. BlueStar is analyzed in great detail and, among other things, it features a new coexistence method between IEEE 802.11 and Bluetooth which employs a novel combination of carrier sense and adaptive frequency hopping. Next, to handle the inefficiency of the current Bluetooth master/slave communication paradigm, we propose a novel QoS-driven dynamic slot assignment and piconet partitioning algorithms. In the context of IEEE 802.11, we initially investigate advanced MAC-based routing strategies. These strategies, referred to as COPAS (contention-based path selection), are intentionally devised and observed to boost TCP performance over the multi-hop type of IEEE 802.11 ad hoc networks, giventhat TCP is by far the most important and widely used transport protocol in today2s networks. Finally, we design and evaluate a new power control MAC protocol for spatial reusability over ad hoc networks, which is observed to considerably outperform existing MAC protocols. We conclude with some promising future work in the areas of both Bluetooth and IEEE 802.11.
Author: Publisher: ISBN: 9780738180076 Category : Local area networks (Computer networks) Languages : en Pages : 2699
Book Description
Abstract: This revision specifies technical corrections and clarifications to IEEE Std 802.11 for wireless local area networks (WLANS) as well as enhancements to the existing medium access control (MAC) and physical layer (PHY) functions. It also incorporates Amendments 1 to 10 published in 2008 to 2011. Keywords: 2.4 GHz, 3650 MHz, 4.9 GHz, 5 GHz, 5.9 GHz, advanced encryption standard, AES, carrier sense multiple access/collision avoidance, CCMP, channel switching, Counter mode with Cipher-block chaining Message authentication code Protocol, confidentiality, CSMA/CA, DFS, direct link, dynamic frequency selection, E911, emergency alert system, emergency services, forwarding, generic advertisement service, high throughput, IEEE 802.11, interface, international roaming, interworking, interworking with external networks, LAN, local area network, MAC, measurement, medium access control, media-independent handover, medium access controller, mesh, MIH, MIMO, MIMO-OFDM, multi-hop, multiple input multiple output, network advertisement, network discovery, network management, network selection, off-channel direct link, path-selection, PHY, physical layer, power saving, QoS, quality of service, PHY, physical layer, QoS mapping, radio, radio frequency, RF, radio resource, radio management, SSP, SSPN, subscriber service provider, temporal key integrity protocol, TKIP, TPC, transmit power control, tunneled direct link setup, wireless access in vehicular environments, wireless LAN, wireless local area network, WLAN, wireless network management, zero-knowledge proof.
Author: Jia Hu Publisher: ISBN: Category : Languages : en Pages :
Book Description
In order to efficiently utilize the scarce wireless resource as well as keep up with the ever-increasing demand for Quality-of-Service (QoS) of multimedia applications, wireless networks are undergoing rapid development and dramatic changes in the underlying technologies and protocols. The Medium Access Control (MAC) protocol, which coordinates the channel access and data transmission of wireless stations, plays a pivotal role in wireless networks. Performance modelling and analysis has been and continues to be of great theoretical and practical importance in the design and development of wireless networks. This research is devoted to developing efficient and cost-effective analytical tools for the performance analysis and enhancement of MAC protocols in Wireless Local Area Networks (WLANs) under heterogeneous multimedia traffic. To support the MAC-layer QoS in WLANs, the IEEE 802.11e Enhanced Distributed Channel Access (EDCA) protocol has proposed three QoS differentiation schemes in terms of Arbitrary Inter-Frame Space (AIFS), Contention Window (CW), and Transmission Opportunity (TXOP). This research starts with the development of new analytical models for the TXOP scheme specified in the EDCA protocol under Poisson traffic. A dynamic TXOP scheme is then proposed to adjust the TXOP limits according to the status of the transmission queue. Theoretical analysis and simulation experiments show that the proposed dynamic scheme largely improves the performance of TXOP. To evaluate the TXOP scheme in the presence of ii heterogeneous traffic, a versatile analytical model is developed to capture the traffic heterogeneity and model the features of burst transmission. The performance results highlight the importance of taking into account the heterogeneous traffic for the accurate evaluation of the TXOP scheme in wireless multimedia networks. To obtain a thorough and deep understanding of the performance attributes of the EDCA protocol, a comprehensive analytical model is then proposed to accommodate the integration of the three QoS schemes of EDCA in terms of AIFS, CW, and TXOP under Poisson traffic. The performance results show that the TXOP scheme can not only support service differentiation but also improve the network performance, whereas the AIFS and CW schemes provide QoS differentiation only. Moreover, the results demonstrate that the MAC buffer size has considerable impact on the QoS performance of EDCA under Poisson traffic. To investigate the performance of EDCA in wireless multimedia networks, an analytical model is further developed for EDCA under heterogeneous traffic. The performance results demonstrate the significant effects of heterogeneous traffic on the total delay and frame losses of EDCA with different buffer sizes. Finally, an efficient admission control scheme is presented for the IEEE 802.11e WLANs based on analytical modelling and a game-theoretical approach. The admission control scheme can maintain the system operation at an optimal point where the utility of the Access Point (AP) is maximized with the QoS constraints of various users.
Author: Kartikeya Tripathi
Author: Kartikeya Tripathi
Author: 
Author: Barry E. Mullins
Author: Ping Wang
Author: Halid Hrasnica
Author: John Griffin
Author: 
Author: 
Author: Halid Hrasnica
Author: Jia Hu