MobiCom 2004, September 26-October 1, 2004, Philadelphia,Pennsylvania, USA, Sponsored by ACM SIGMOBILE
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 MobiCom 2004 Keynote Speech

The Wireless Century
Richard D. Gitlin
Senior Research Vice President [retired]
Bell Laboratories, Lucent Technologies
Vice President, Technology
NEC Labs America [retired]

This talk will project an aggressive vision of the Wireless Century and present some of the research challenges that must be addressed and realized to make this vision a reality.

In the 19th century, the invention of the telegraph and the telephone forever changed how messages moved around the world. In the 20th century, radio, television, computers and the Internet further revolutionized the near-instantaneous processing and transmission of data. The 21st century is poised to usher in an undeniable future of pervasive wireless networking, actually a second Information Age, in which wireless technologies, and their benefits, will be accessible anytime, anywhere --- the Wireless Century of pervasive broadband wireless networking is upon us! This is profound.

Wireless and mobile technology will forever alter how people access information, and has the potential to be much more disruptive than the Internet. Soon, most consumer electronics - from computers to stereos to coffee makers - will wireless network using Wireless LANs [WiFi], Bluetooth, Ultrawideband, and other emerging short-to-medium-range technologies. Almost any piece of consumer electronics will sense the wireless network and automatically configure itself --- these technologies will, rapidly and permanently, weave themselves into all facets of our lives like electricity.

Concurrently, wireless operators and equipment providers are introducing a significant mobile network upgrade -- dubbed 3G, or "Third Generation" -- that is IP-based and will let cell phones and other such devices transmit more data, and do it faster than ever before. These systems have greater range and mobility, but significantly lower speeds than Wireless LANS. 3G systems feature "Smartphones" -- cell phones that gather [e.g., cameras] and display information beyond simply sound - and have garnered much of the buzz surrounding 3G. To provide the best of both worlds, new dual-mode (3G/WiFi) phones are just now being introduced that will provide seamless mobility between the LAN and WAN.

A major challenge to realizing the wireless century will occur as wireless moves beyond 3G HSDPA/HDR, and into the pervasive broadband era of WiMAX and beyond. Here, we will be entering a period of demand imbalance. This will occur because the volume and speed of wireless applications that comprise the world of pervasive broadband wireless networking will grow faster than the core infrastructure technology is able to support ---each time an application is added, the demand for wireless devices grows. On the other hand, with ever-increasing data traffic, congested cells and lack of uniform coverage will become major problems for wireless networks. Innovative solutions, such as novel mesh network architectures that leverage the advantages of the cellular infrastructure, multi-hop WLAN/802.11/WiFi systems, and emerging dual-mode [3G/WiFi] terminal may become the network of choice.

Of course, the "classic" wireless challenges remain: providing rates, reliability, costs, security, and management that exceed wireline capabilities. And yes, there is the issue of power [amazing progress here, finally].

Adaptive Wireless Networking Using Cognitive Radios as a Building Block

D. Raychaudhuri
WINLAB, Rutgers University

This talk presents a discussion of cognitive software-defined radio as a building block for future adaptive wireless networks in which radio nodes collaborate in an ad-hoc manner to share spectrum and create useful network services. A number of proposed cognitive radio methods are introduced, including autonomous agile radios, reactive interference control, spectrum etiquette channel, Internet-based spectrum server and ad-hoc multi-hop collaboration. Preliminary simulation and experimental results are given for example cognitive radio schemes, and their relative complexity and performance are compared. The concept of building adaptive, self-organizing wireless networks using cross-layer PHY/MAC/network collaboration between programmable radio nodes is introduced. Protocol and system design issues for adaptive ad-hoc wireless networks are briefly discussed, and topics for future research in this area are identified in conclusion.


Dipankar Raychaudhuri is Professor, Electrical & Computer Engineering Department and Director, WINLAB (Wireless Information Network Lab) at Rutgers University. As WINLAB's Director, he is responsible for a cooperative industry-university research center with focus on next-generation wireless technologies. WINLAB's current research scope includes topics such as RF/sensor devices, UWB, spectrum management, future 3G and WLAN systems, ad-hoc networks and pervasive computing. He is also the principal investigator for the NSF-funded "ORBIT" open-access wireless networking testbed now under development. He has previously held progressively responsible corporate R&D positions in the telecom/networking industry including: Chief Scientist, Iospan Wireless (2000-01), Assistant General Manager & Dept Head-Systems Architecture, NEC USA C&C Research Laboratories (1993-99) and Head, Broadband Communications Research, Sarnoff Corp (1990-92).

Dr. Raychaudhuri obtained his B.Tech (Hons) from the Indian Institute of Technology, Kharagpur in 1976 and the M.S. and Ph.D degrees from SUNY, Stony Brook in 1978, 79. He is a Fellow of the IEEE.

 Luncheon Speech

Information Technology and its Information theoretic roots

Robert G. Gallager
Professor emeritus, M.I.T.

Information theory, invented in 1948 by Claude Shannon, is an elegant mathematical theory that was originally expected to revolutionize communication technology and, more broadly, our daily lives. The theoretical structure of this field grew rapidly, but there were relatively few important practical applications for about 30 years. More recently, both the basic architecture and the major system components of modern digital communication systems, and especially mobile systems, have evolved directly from information theoretic developments.

We discuss this transition from theory to practice, using personal anecdotes, various landmark events, and a fair amount of speculation. We then discuss the way that basic research and its support in the communication sciences are changing. A critical issue is that basic research moves slowly and unevenly, whereas technology (when the basic ideas are in place) moves at an ever faster and more frenetic pace. We discuss ways of both enhancing basic research and improving its coupling to technology.

New Directions in Mobile Communications Services

Mr. Masaki Yoshikawa
Managing Director, Global Coordination Department
NTT DoCoMo, Inc.

New forms of mobile communication are emerging, permeating every aspect of our society, revitalizing business and personal life, bringing efficiency to businesses and security to our daily life. This presentation will first survey the new trends and new challenges in mobile multimedia applications and technology in Japan, including what one can do today and what one can expect in the future. In this context, this talk will then outline DoCoMo's data communication infrastructure and services, and the current status of i-mode and the 3G FOMA service. We will then describe the future possibilities of mobile communications, and how all of these will change the face of business and personal lives of people.

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