PROTOCOLS FOR HIGH-EFFICIENCY WIRELESS NETWORKS
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1 PROTOCOLS FOR HIGH-EFFICIENCY WIRELESS NETWORKS
2 PROTOCOLS FOR HIGH-EFFICIENCY WIRELESS NETWORKS by Alessandro Andreadis Giovanni Giambene KLUWER ACADEMIC PUBLISHERS NEW YORK, BOSTON, DORDRECHT, LONDON, MOSCOW
3 ebook ISBN: Print ISBN: Kluwer Academic Publishers New York, Boston, Dordrecht, London, Moscow Print 2003 Kluwer Academic Publishers Dordrecht All rights reserved No part of this ebook may be reproduced or transmitted in any form or by any means, electronic, mechanical, recording, or otherwise, without written consent from the Publisher Created in the United States of America Visit Kluwer Online at: and Kluwer's ebookstore at:
4 Acknowledgments: The authors wish to thank Prof. Giuliano Benelli for his continuous help and encouragement.
5 Table of contents PREFACE XI PART I: MOBILE COMMUNICATIONS SYSTEMS AND TECHNOLOGIES CHAPTER 1: MULTIPLE ACCESS TECHNIQUES FOR WIRELESS SYSTEMS FREQUENCY DIVISION MULTIPLE ACCESS (FDMA) TIME DIVISION MULTIPLE ACCESS (TDMA) RESOURCE REUSE WITH TDMA AND FDMA CODE DIVISION MULTIPLE ACCESS (CDMA) DS-CDMA spreading process Basic considerations on the capacity of DS-CDMA systems 13 CHAPTER 2: THE GLOBAL SYSTEM FOR MOBILE COMMUNICATIONS INTRODUCTION TO GSM Base station sub-system Network sub-system GPRS TYPICAL PROCEDURES GSM STANDARD EVOLUTION GPRS NETWORK ARCHITECTURE GSM-GPRS AIR INTERFACE: DETAILS ON PHYSICAL LAYER EDGE AND E-GPRS RADIO RESOURCE MANAGEMENT CONCEPTS QOS ISSUES IN THE GPRS SYSTEM GPRS SERVICES GPRS tunneling protocol architecture GPRS protocol stack CHAPTER 3: 3G MOBILE SYSTEMS UMTS TRAFFIC CLASSES UMTS ARCHITECTURE DESCRIPTION UTRAN RESOURCES UMTS AIR INTERFACE: CHARACTERISTICS OF THE PHYSICAL LAYER UTRA-FDD physical layer characteristics Mapping of transport channels onto physical channels UTRA-TDD physical layer characteristics VOICE SERVICE IN UMTS NEW SERVICE CONCEPTS SUPPORTED BY UMTS UMTS RELEASES DIFFERENCES
6 viii Protocols for High-Efficiency Wireless Networks Release '99 Release 4 Release 5 CHAPTER 4:SATELLITE COMMUNICATIONS 4.1 BASIC CONSIDERATIONS ON SATELLITE COMMUNICATIONS Satellite orbit types Frequency bands and signal attenuation Satellite network telecommunication architectures 4.2 DIFFERENT TYPES OF MOBILE SATELLITE SYSTEMS Satellite UMTS Future satellite system protocols for high-capacity transmissions 4.3 OVERVIEW OF PROPOSED MOBILE SATELLITE SYSTEMS CHAPTER 5:MOBILE COMMUNICATIONS BEYOND 3G REVIEW ON NEW ACCESS TECHNOLOGIES 4G VIEW FROM EU RESEARCH PROJECTS PART II: SCHEDULING TECHNIQUES, ACCESS SCHEMES AND MOBILE INTERNET PROTOCOLS FOR WIRELESS COMMUNICATION SYSTEMS CHAPTER 1: GENERAL CONCEPTS ON RADIO RESOURCE MANAGEMENT CHAPTER 2:TRAFFIC MODELS VOICE SOURCES VIDEO SOURCES WEB BROWSING SOURCES SELF-SIMILAR TRAFFIC SOURCES DATA TRAFFIC SOURCES CHANNEL MODELS CHAPTER 3:RRM IN GPRS DESCRIPTION OF LAYER 2 PROTOCOLS OF GPRS MEDIUM ACCESS MODES TERMINAL STATES AND TRANSFER MODES ACCESS TECHNIQUES P-persistent access procedure One- and two-phase access procedures Queuing and polling procedures Paging procedure A detailed example of a one-phase access procedure 3.5 GPRS PERFORMANCE EVALUATION CHAPTER 4: RRM IN WCDMA
7 Protocols for High-Efficiency Wireless Networks ix ADOPTED MODELS DETAILED DESCRIPTION OF THE PROPOSED RRM SCHEME SIMULATION RESULTS CHAPTER 5: RRM IN UTRA-TDD RADIO INTERFACE PROTOCOL ARCHITECTURE: DETAILS TRANSPORT AND PHYSICAL CHANNELS Spreading for downlink and uplink physical channels Multiplexing, channel coding and interleaving 5.3 MAC LAYER MAC services and functions 5.4 RLC SERVICES AND FUNCTIONS 5.5 RESOURCE MANAGEMENT FOR DSCH Resource allocation and UE identification on DSCH DSCH model in UTRAN 5.6 PERFORMANCE EVALUATION FOR PACKET TRAFFIC OVER UTRA-TDD Study assumptions The proposed RRM scheme Simulation results CHAPTER 6:RRM IN WIRELESS MICROCELLULAR SYSTEMS ATB-P PROTOCOL DESCRIPTION ATB-P PERFORMANCE EVALUATION CHAPTER 7: RRM IN LEO-MSSS CHAPTER 8: ANALYTICAL METHODS FOR RRM ANALYSIS AND FINAL CONSIDERATIONS ON RRM TECHNIQUES THE CLASSICAL PRMA PROTOCOL IN LEO-MSSS PRMA WITH HINDERING STATES (PRMA-HS) MODIFIED PRMA (MPRMA) DRAMA PROTOCOL PERFORMANCE COMPARISONS STABILITY STUDY OF PACKET ACCESS SCHEMES ANALYSIS OF ROUND ROBIN TRAFFIC SCHEDULING 2-MMPP TRAFFIC DELAY ANALYSIS LESSONS LEARNED ON RRM STRATEGIES CHAPTER 9: A FIRST SOLUTION TOWARDS THE MOBILE INTERNET: THE WAP PROTOCOL INTRODUCTION TO WAP WAP ARCHITECTURE WAP PROTOCOL STACK Bearers for WAP on the air interface 9.4 TOOLS AND APPLICATIONS FOR WAP CHAPTER 10: THE MOBILE INTERNET 10.1 IP AND MOBILITY
8 x Protocols for High-Efficiency Wireless Networks Mobile IP Micro-mobility and the Cellular IP approach 10.2 WIRELESS TCP Mechanisms for improving wireless TCP performance on errorprone channels REFERENCES BOOK INDEX End-to-end approach Split-connection approach Link layer approach A final comparison
9 Preface Radio transmissions have opened new frontiers allowing the exchange of information with remote units. From the first applications of telegraphy and radio broadcast, wireless transmissions have obtained a great success with the widespread diffusion of mobile communications. We live in the communication era, where any kind of information must be easy accessible to any user at any time. Mobile communication systems are the technical support that allows the realization of such concepts. With the term mobile communications we embrace a set of technologies for radio transmissions, network protocols, mobile terminals and network elements. The widespread diffusion of wireless communications is making national borders irrelevant in the design, delivery and billing of services, thus requiring international coordination of standardization efforts in order to evolve regional systems towards global ones. Parallel to the evolution of radio-mobile systems, we assist to the massive diffusion of Internet network and contents, thus allowing many users on the earth to be interconnected and to exchange any kind of information, data, images and so on. Hence, there is a quick convergence of mobile communications and Internet, i.e., mobile computing (see Fig. 1).
10 xii Protocols for High-Efficiency Wireless Networks The first cellular systems became operational at the beginning of 1980 (first-generation, 1G). They employed analog techniques and rapidly diffused with each country having its own system. A first evolution was achieved 10 years later by the adoption of digital standards (secondgeneration, 2G). Presently, we are assisting to the deployment of thirdgeneration mobile cellular systems (3G) that under umbrella recommendations collect at least three different standards. They are intended to provide the users with high bit-rate transmissions so as to allow a fast access to the Internet and, in general, multimedia transmissions on the move [i],[ii]. In some European countries and in Japan the widespread diffusion of mobile communications has reached the point to surpass the number of wired phones. This is an important achievement that significantly highlights the diffusion of mobile communication systems.
11 Protocols for High-Efficiency Wireless Networks xiii The unique capabilities of new cellular systems are expected to provide users with integrated multimedia applications. Small, powerful, application-enabled devices will bring mobility needs together with the desire for data and information. Networks will be based on the IP protocol [iii], including the support of Quality of Service (QoS) for differentiated traffic classes. The air interface still represents the system bottleneck, by limiting the available user bit-rate due to both spectrum availability and radio propagation impairments. At present, some mobile terminals have integrated a Java Virtual Machine, an important step towards the mobile computing and the support of typical Internet applications. In fact, the Java language permits the development of platform-independent applications. Another powerful tool for the realization of new applications and services is represented by the extensible Markup Language (XML) and related technologies. In fact, XML can be used to design Web pages that can be adapted to different Internet access devices and technologies (e.g., mobile terminals with small displays, Personal Digital Assistants, common personal computes, etc.) by using the characteristics of the HyperText Transfer Protocol (HTTP). In fact, an Internet server can be equipped with an adaptation engine that recognizes the access technology according to suitable fields in the HTTP packet header; hence, different translation rules can be used to adapt the XML contents [iv]. However, the expected diffusion of new applications and multimedia services can be only reached trough a novel system design that takes into account all the communication aspects from the application layer to the physical one, according to the OSI standard reference model. This approach is particularly effective for the air interface. In fact, a user application cannot be designed without accounting for the limited bandwidth, error resilience and reduced display sizes on mobile terminals. In addition to this, the performance of the transport layer protocol (TCP) must be evaluated in the presence of air interface resource constraints and the related traffic must be suitably managed to avoid that transmission delays or channel impairments negatively affect the TCP throughput. Moreover, the network layer must account for user mobility and the consequent re-routing of information when a user changes its cell. The frequency of handoff procedures among adjacent
12 xiv Protocols for High-Efficiency Wireless Networks cells will be exacerbated in future 3G micro-cellular systems. Hence, the handoff process needs to be particularly optimized to avoid the loss of information during handoffs. Finally, the medium access control layer must be able to integrate the support of different traffic classes, guaranteeing ad hoc QoS levels, fairness among users and high utilization of radio resources. All these aspects call for solutions suitably developed for the air interface [v]. Therefore, the focus of this book is on the optimization of the protocols at different layers in order to achieve simultaneously the maximum utilization of radio resources and the maximum satisfaction of users, two aspects typically in contrast. This book will cover different wireless communication scenarios and, in particular: 2.5G and 3G mobile communication systems (i.e., GPRS, UTRA-FDD and UTRA-TDD); 4G broadband wireless access systems (e.g., HIPERLAN/2); mobile satellite systems. A complete review of such systems is carried out in PART I. Then, PART II will first focus on both the performance evaluation of different resource management techniques for the above mentioned air interfaces and, then, will address the protocols at network and transport layers to allow the mobile access to the Internet (i.e., TCP/IP and WAP). Hence, we will consider the impact on the throughput of cellular systems due to both the user mobility and the transmission of data packets on error-prone channels. References [i] M. Zeng, A. Annamalai, V. K. Bhargava, Recent Advances in Cellular Wireless Communications, IEEE Comm. Mag., pp , September [ii] Ojanpera and R. Prasad. Wideband CDMA for Third Generation Mobile Communications. Artech House, October [iii] T. Robles, A. Kadelka, H, Velayos, A. Lappetelainen, A. Kassler, H. Li, D. Mandato, J. Ojala, B. Wegmann, QoS Support for an All-IP System Beyond 3G, IEEE Comm. Mag., pp , August 2001.
13 Protocols for High-Efficiency Wireless Networks xv [iv] [v] Network Working Group, Hypertext Transfer Protocol - HTTP/1.1, (Web page) URL: June M. N. Moustafa, I. Habib, M. Naghshineh, M. Guizani, QoS- Enabled Broadband Mobile Access to Wireline Networks, IEEE Comm. Mag., Vol. 40, No. 4, pp , April 2002.
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