MobiCom 2003, September 14-19, 2003, San Diego, California, USA, Sponsored by ACM SIGMOBILE
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Welcome to MobiCom 2003!

 Message from the General Chair

David B. Johnson
It is my great pleasure to welcome you to MobiCom 2003, the Ninth Annual International Conference on Mobile Computing and Networking, and to beautiful, sunny San Diego. This year, MobiCom returns for the first time to California, where the first MobiCom was held in Berkeley in 1995. MobiCom has grown substantially since then, from a brand new conference with a strong vision, to the MobiCom of today, firmly established as the premier international forum for research in all areas of mobile computing and wireless and mobile networking at the link layer and above. MobiCom is the place to be in this exciting research area.

This year's MobiCom features a very strong technical program, assembled under the expert leadership of Program Co-Chairs Anthony Joseph and Nitin Vaidya. Together with the Technical Program Committee, they undertook the difficult job of carefully evaluating the large number of submitted papers, considering the merits of each through detailed reviews and discussions at the Program Committee meeting, and selecting a technical program of the highest caliber. I would like to thank Nitin and Anthony for their dedication to putting together this great technical program for the conference, and thank all of the authors for submitting their work to MobiCom. In addition, we are fortunate to have what is sure to be an excellent Keynote Speech by Dr. Paul J. Kolodzy, Director of the Wireless Network Security Center (WiNSeC) at Stevens Institute of Technology. Dr. Kolodzy's previous work also includes serving as Senior Spectrum Policy Advisor and Director of the Spectrum Policy Task Force at the United States FCC, and as a Program Manager at DARPA.

On the two days before the main conference, we have five tutorials on the latest research areas and background topics in mobile computing and networking, presented by experts in the field; Tutorial Co-Chairs Atul Adya and Jean-Pierre Hubaux did an excellent job of selecting this high quality tutorial program. The day after the main conference features six concurrent full-day workshops on emerging topics related to mobile computing and networking, each organized separately; I hope you be able to stay and take advantage of this great opportunity.

On Thursday morning, the conference will feature a lively, informative, and controversial panel discussion on the challenges of a more secure wireless and mobile future; I would like to thank Martha Steenstrup for serving as Panels Chair and Zygmunt Haas for organizing and moderating this panel session. The conference also features a combined research demos and student poster session; David Maltz deserves thanks for the huge job of coordinating the demo session and the space and logistical requirements of each demo, and Nigel Davies and James Kempf did an excellent job, under tight time constraints, of selecting the student posters to be presented at the session.

Local arrangements for the conference were handled with diligence and creativity by Vikram Srinivasan, who deserves thanks for taking care of the great many details involved in a conference of this size. Publicity Co-Chairs Eyal de Lara and Hiroyuki Morikawa did a wonderful job of quickly and efficiently getting the word out about the conference when needed. John Heidemann and Srikanth Krishnamurthy organized and helped to ensure that everything worked smoothly with registration. Finance Chair Ed Knightly managed the conference finances and budgeting process. Thanks also to the staff at ACM, particularly Ginger Ignatoff, Erin Dolan, Maritza Nichols, Adrienne Griscti, Donna Baglio, and Rachael Barish, for their invaluable assistance throughout the process of planning and putting together the conference.

Finally, I would like to thank the following leading edge companies and organizations, whose generous support contributed to the success of MobiCom 2003: Microsoft Research, NTT DoCoMo USA Labs, Nokia, Lucent, Intel, Cal-(IT)2, Wiley, and Kluwer. In these tight economic times, their involvement in MobiCom and their support of the conference is especially appreciated and demonstrates their commitment to the future of mobile computing and networking.

Again, welcome to San Diego and to MobiCom 2003. I hope that you will find the conference informative and enjoyable, that you will take the opportunity to meet new friends and visit with old friends, and that you will have a great stay in San Diego.
David B. Johnson
MobiCom 2003 General Chair

 Message from the Technical Program Chairs

Anthony D. Joseph Nitin H. Vaidya
Welcome to ACM MobiCom 2003, the Ninth Annual International Conference on Mobile Computing and Networking in San Diego, California. Over the years, MobiCom has established itself as the premier conference in mobile computing and wireless networking, and we believe that this year's program is also worthy of this reputation.

As in recent years, MobiCom this year received a large number of excellent submissions, a total of 281 papers. The Technical Program Committee (TPC) used a rigorous three-phase double-blind review process to evaluate the submissions. In a preliminary phase, the TPC removed 23 papers that were clearly unsuitable for MobiCom (e.g., because the topic of the paper was deemed to be outside the scope for MobiCom).

Only TPC members reviewed the remaining 258 papers with a few exceptions. This first review phase was followed by a second round of online discussion of each paper by the paper's three to five member TPC review team. A summary second round review was written and each paper was marked as ACCEPT, DISCUSS, or REJECT. During this round, additional reviews were provided by other TPC members, or by other known experts to help the TPC teams reach a consensus on papers where there were differing opinions. In the cases where consensus could not be reached, the paper was marked DISCUSS. At the end of the second round, 70 papers were on the ACCEPT/DISCUSS list. During this process, the TPC members reviewed an average of 18 papers, and were permitted to select any paper on the REJECT list for inclusion on the DISCUSS list.

On May 31 and June 1, 2003, we held the TPC meeting in Annapolis with 42 members of the TPC out of a possible 52 present, and several others joining via phone conference. All papers in the ACCEPT/DISCUSS categories were treated equally and discussed at length at the meeting. 27 papers were accepted for inclusion in the program. Of these, 15 papers were marked for shepherding by TPC members.

All of this could not have been possible without the hard work of many people, including Keith Sklower at UC Berkeley who set up and maintained the EDAS paper submission server, Erin Dolan at ACM who arranged the TPC meeting, and Lisa Tolles at Sheridan Publishing who helped us assemble these proceedings. We'd also like to thank the program committee and the external reviewers for all their hard work. It has been a privilege to work closely with so many experts. We have been impressed with the amount of time that they volunteered to review, discuss, and shepherd papers. Special thanks to Samir Das, Ed Knightly, and Ram Ramanathan for their help in selecting the award paper from the papers with a student as the primary author.

Finally, all of the authors that submitted papers to MobiCom 2003 deserve recognition for they are the ones that make a conference successful. It was difficult selecting so few papers from so many, and we sincerely hope that the authors whose papers were rejected are able to benefit from the reviewers' comments.

Welcome again to ACM MobiCom 2003. We hope that you will enjoy the conference and your stay in San Diego.
Anthony D. Joseph and Nitin H. Vaidya
MobiCom 2003 Technical Program Chairs

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