Call Admission Control for Wireless Broadband Networks ab 32.9 € als Taschenbuch: Overview and proposals for radio resource management optimization for wireless broadband networks. Aus dem Bereich: Bücher, Wissenschaft, Technik,
Call Admission Control for Wireless Broadband Networks ab 32.9 EURO Overview and proposals for radio resource management optimization for wireless broadband networks
There exist many regions in the world where wired infrastructures are difficult to deploy for geographical or economic reasons. Thus, the need for the Wireless Broadband Networks (WBNs) has emerged as an alternative for last-mile Internet access. One of the clear examples of WBNs is WiMAX. To handle a heterogeneous traffic load in a multiservice WBN such as WiMAX, it is important to find a resource management mechanism -such as Call Admission Control (CAC)- that can efficiently allocate resources to different subscribers and applications. This book demonstrates what WiMAX is, and provides a detailed review about the proposed CAC polices presented in the literature. Moreover it proposes a WBN CAC framework which is formulated as an optimization problem with a certain objective function where the demands of both WBN service providers and subscribers are taken into account. Simulation results show that the proposed CAC framework can meet the expectations of both service providers and subscribers. This framework can assure reasonable fairness while achieving better performance in terms of revenue and utility when compared with the constrained CAC approaches presented in the literature.
Mobile communication is an integrated part of our daily lives. It surrounds us, and provides a ubiquitous communication channel even for the most demanding multimedia services. The focus of mobile communication shifts from voice to mobile broadband data services. Mobile operators are introducing novel techniques, such as High Speed Packet Data (HSXPA) and UMTS LTE (Long Term Evolution), to serve more traffic on the radio interface. Radio cells are also getting smaller, so mobile operators can achieve higher level of spatial reuse of the radio channels, too. Besides transmission speed, the quality of the connection is also a very important aspect, which might turn the balance in the competition among operators. The topic of my dissertation is finding the right balance between the quantity and the quality in mobile networks, by focusing on three main aspects: 1.) Tracking mobile user movements in cellular mobile wireless networks, 2.) A Ring based Call Admission Control algorithm and Ring Based Mobility management algorithm, 3.) The performance evaluation of Anycast Based Micro-mobility Management
The consumption of media has changed with increased penetration of broadband and mobile networks. Today, media streaming is used broadly in various applications and is also being widely used to create new business models such as Video or Media on Demand. Due to the real-time requirements in streaming, overload prevention is vital to guarantee an uninterrupted play of the media. Unfortunately, client demands for media services are highly variable and required server capacities are therefore hard to predict. Admission control is used to accept or deny incoming service requests in order to avoid overload, but existing media streaming software includes only limited support for admission control by allowing for pre-defined static rules. While in media streaming the bottleneck resource (CPU, disk I/O, etc.) might change over time, such rules define thresholds concerning the utilization of only a single resource: the bandwidth. This work introduces a method for adaptive admission control in the presence of multiple scarce resources, which allows predictive rejections of service requests to reserve capacity for future requests with higher revenues in order to maximize overall profit.
Most experts believe that WiMAX technology is a preliminary step to develop Fourth Generation networks known as 4G technologies. It has not only succeeded in the utilization of several of the latest telecommunication techniques in the form of unique practical standards, but also paved the way for the quantitative and qualitative developments of high-speed broadband access. IEEE 802.16 Standard introduces several advantages, and one of them is the support for Quality of Services (QoS) at the Media Access Control (MAC) level. For these purposes, the standard defines several scheduling classes at MAC layer to treat service flow in a different way, depending on QoS requirements. In this thesis, we have proposed a new QoS framework for Point-to-Multi Point (PMP) 802.16 systems operating in Time Division Duplexing (TDD) mode over a WirelessMAN-OFDM physical layer. The proposed framework consists of a Call Admission Control (CAC) module and a scheduling scheme for the uplink traffic as well as a simple frame allocation scheme.
The need to support ubiquitous connectivity with higher data rate for mobile computers and communication devices are fuelling a growing interest in broadband wireless access (BWA) networks. WiMAX(Worldwide Interoperability for Microwave Access ), a technology based on IEEE 802.16 is a standard for Wireless Metropolitan Area Networks (Wireless MAN) which aims to provide broadband access in the last mile with QoS (Quality of Service) guarantees for heterogeneous class of services with different QoS requirements. The QoS requirements are given in terms of bandwidth, latency, jitter, reliability etc. Although IEEE 802.16 standard defined the QoS parameters, they do not specify how these QoS parameters are satisfied and it is an open issue for research. This book analyses the design of Adaptive Call Admission Control (CAC) scheme for QoS provisioning in IEEE 802.16 based WiMAX networks. This book will be helpful to post graduate students and especially to those who want to continue research in call admission control aspect of WiMAX networks and other cellular based networks.
Supporting diverse applications with various Quality-of-Service guarantees in ATM-based broadband networks requires the design of a proper bandwidth control mechanism at the switch nodes. We proposed in this work a new adaptive approach to the bandwidth control and developed an Adaptive Bandwidth Scheduling Scheme, called CABS . Our scheme uses the laxity of cells and a combination of four priority types: space priority, time priority, cell loss priority and rate regulation . The novel concept facilitates achieving the desired design goals while enabling the flexible control and the lower complexity. The CABS scheme has further advantages, including isolation, fair and adaptive distribution of bandwidth. In order to give a complete solution, an integrated concept was proposed for bandwidth management, connection admission control and flow control. Several simulations were made to exemplify the service guarantees and other advantageous properties provided by the CABS scheme for the single node case and for a network configuration.
OFDMA is used on the downlink of broadband wireless access networks such as Worldwide Interoperability for Microwave Access (WiMAX) and Long Term Evolution (LTE) as it is able to offer substantial advantages such as combating channel impairments and supporting higher data rates. This book's focus is on the development of practical resource allocation schemes for the OFDMA downlink. Imperfect Channel State Information (CSI), the limited capacity of the dedicated link used for CSI feedback, and the presence of a Connection Admission Control (CAC) unit are issues that are considered in this book to develop practical schemes.