It is shown that, particularly for terrestrial cellular telephony, the interference-suppression feature of CDMA (code division multiple access) can result in a many-fold increase in capacity over analog and even over competing digital techniques. A single-cell system, such as a hubbed satellite network, is addressed, and the basic expression for capacity is developed. The corresponding expressions for a multiple-cell system are derived. and the distribution on the number of users supportable per cell is determined. It is concluded that properly augmented and power-controlled multiple-cell CDMA promises a quantum increase in current cellular capacity. >

On the capacity of a cellular CDMA system

Praise for the Third Edition: "This is one of the best books available. Its excellent organizational structure allows quick reference to specific models and its clear presentation . . . solidifies the understanding of the concepts being presented."IIE Transactions on Operations EngineeringThoroughly revised and expanded to reflect the latest developments in the field, Fundamentals of Queueing Theory, Fourth Edition continues to present the basic statistical principles that are necessary to analyze the probabilistic nature of queues. Rather than presenting a narrow focus on the subject, this update illustrates the wide-reaching, fundamental concepts in queueing theory and its applications to diverse areas such as computer science, engineering, business, and operations research.This update takes a numerical approach to understanding and making probable estimations relating to queues, with a comprehensive outline of simple and more advanced queueing models. Newly featured topics of the Fourth Edition include:Retrial queuesApproximations for queueing networksNumerical inversion of transformsDetermining the appropriate number of servers to balance quality and cost of serviceEach chapter provides a self-contained presentation of key concepts and formulae, allowing readers to work with each section independently, while a summary table at the end of the book outlines the types of queues that have been discussed and their results. In addition, two new appendices have been added, discussing transforms and generating functions as well as the fundamentals of differential and difference equations. New examples are now included along with problems that incorporate QtsPlus software, which is freely available via the book's related Web site.With its accessible style and wealth of real-world examples, Fundamentals of Queueing Theory, Fourth Edition is an ideal book for courses on queueing theory at the upper-undergraduate and graduate levels. It is also a valuable resource for researchers and practitioners who analyze congestion in the fields of telecommunications, transportation, aviation, and management science.

Fundamentals of Queueing Theory

Information Theory and Reliable Communication

This document provides updates to IEEE Std 802.16's MIB for the MAC, PHY and asso- ciated management procedures in order to accommodate recent extensions to the standard.

IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed Broadband Wireless Access Systems Draft Amendment: Management Information Base Extensions

Ultra Wideband Signals and Systems in Communication Engineering

Mobile network operators urgently need to scalable and reliable mobility management solutions to cope with the explosive increase of the mobile users and internet traffic Although the network-based PMIPv6 protocol is considered the favorable solution to solve the problems of host-based MIP protocol, these protocols are based on centralized mobility management CMM scheme Current mobility solutions posing several challenges due to heavily centralized architecture Furthermore, the future 5G networks are based on flat infrastructures to reduce the load in the network core The distributed mobility management DMM scheme is introduced recently to overcome the problems of CMM Additionally, to maintain the heterogeneity of future wireless networks, IEEE 80221 Media Independent Handover (MIH) framework identifies the structure and services to provide seamless handover in heterogeneous networks In this paper, we develop an efficient network-based fully DMM scheme based on the cross layer design of layer 2 MIH and layer 3 PMIPv6 protocols The proposed approach removes any central anchor node in the network infrastructure and also eliminates any layer 2 and layer 3 signaling between the mobile node and the access networks The numerical evaluation shows that the efficient approach gives enhance handover performance in terms of signaling cost, handover latency, and packet loss

/pdf/fully-distributed-mobility-management-scheme-for-future-4tbe2q0ajl.pdf

Fully distributed mobility management scheme for future heterogeneous wireless networks

The development of a computational platform of a communication network for an automation system using the precepts of IEC 61850 has become a great trend in substation automation systems (SASs) research. Recent developments in wireless communication technologies, especially the IEEE802.11 have enabled cost-effective remote control systems with a capability of monitoring, control and protection in the real-time operating conditions of substations. The message delay and throughput in substation automation while using the WLAN and smart grid must satisfy the standard requirements specified in the IEC 61850-5. In this paper, the end-to-end (ETE) delay of IEC 61850-based messages and operating time of the over current protection using the WLAN-based communication network has been evaluated using Opnet Modeler Edition 18.0.

IEC 61850-based WLAN peer-to-peer feeder protection improvement in smart grid substation automation system

We present the Websim project, a simulation environment for self-developed simulation tools. It provides Web and distributed features for a simulation model or library created using the C/C++ language. Websim is implemented using CGI and Javascript technologies. It can be accessed on any platform (Unix, PC or Mac) using a standard Web browser. With this simulation environment, an easier and faster integration of simulation and visualization techniques and tools into the Internet will be supported. The possibilities and problems of these techniques are discussed.

A prototype of Web-based simulation environment: using CGI and Javascript

This paper deals with the transmission of digital data in ATM like format over a noisy wireless channel affected by burst of errors. It evaluates and compares go-back-N (GBN) and selective repeat (SR) for non-real time traffic over the wireless portion of the network for variable packet size and fixed packet size, and the effect of packet loss and check-sum error percentages on the throughput. Results show that SR-ARQ achieves better throughput under a wide variety of error rate conditions than GBN-ARQ.

Data link control layer performance for variable packet size and fixed packet size (wireless ATM packet)

Multimedia traffic is expected to be included in the next generation of wireless networks. As in wireline networks, the wireless network must also be capable of providing guaranteed quality-of-service (QoS) over the lifetime of mobile connections. In this paper, a bandwidth reservation scheme incorporating a user mobility prediction is proposed to manage the QoS of the networks. The mobility prediction scheme is developed based on the aggregate history of mobile users. Based on the mobility prediction, bandwidth is reserved to guarantee the uninterrupted handoff process. Simulation results demonstrate that the proposed scheme can guarantee the required QoS requirements in terms of handoff call dropping probability and new call blocking probability while maintaining efficient bandwidth utilization.

Borhanuddin Mohd Ali

Papers

Fully distributed mobility management scheme for future heterogeneous wireless networks

IEC 61850-based WLAN peer-to-peer feeder protection improvement in smart grid substation automation system

A prototype of Web-based simulation environment: using CGI and Javascript

Data link control layer performance for variable packet size and fixed packet size (wireless ATM packet)

Aggregate History of User Mobility Pattern for QoS Provisioning in Multimedia Wireless Networks