Dig deeper into the topic of mobile computing infrastructure. These leads come from the references of the original papers.

First works & Good background. 
1. Roy Want, Andy Hopper, Veronica Falco, and Jonathan Gibbons. The Active Badge location system.ACM Transactions on Information Systems, 10(1):91{102, January 1992. 
2. Mark Weiser. The computer for the twenty-first century. Scientific American, pages 94-100, September 1991.
3. Adaptive Protocols for Information Dissemination in Wireless Sensor Networks (1999)   Joanna Kulik, Wendi Rabiner, and Hari Balakrishnan MIT

 

This looks more and more like routing issues in Ad-hoc networks. 
1. Gianni Di Caro and Marco Dorigo. AntNet: A Mobile Agents Approach to Adaptive Routing . Technical Report 97-12, IRIDIA, Unlversite ' Librede BruxeIles , 1997.
2. Sze-Yao Ni, Yu-Chee Tseng, Yuh-Shyan Chen, and Jang-Ping Sheu. The Broadcast Storm Problem in a Mobile Ad Hoc Network. I n Proceedings of the Fifth Annual ACM/IEEE Interatlonal Conferenee on Mobile Computing and Networking (MobiCom'99), Seattle , WA, 1999.
3. S. E. Czerwinski, B. Y. Zhao, T. D. Hodes, A. D. Joseph, and R. H. Katz. An architecture for a secure service discovery service. In Proceedings of the ACM/IEEE International Conference on Mobile Computing and Networking, pages 24–35, Seattle, WA, USA, Aug. 1999. ACM.
4. W. R. Heinzelman, J. Kulik, and H. Balakrishnan. Adaptive protocols for information dissemination in wireless sensor networks. In Proceedings of the ACM/IEEE International Conference on Mobile Computing and Networking, pages 174–185, Seattle, WA, USA, Aug. 1999. ACM.

Providing data from mobile devices to the rest of the network
1. Mike Esler, Jeffrey Hightower, Tom Anderson, and Gaetano Borrielo. Next century challenges: Data-centric networking for invisible computing. In Fifth ACM Conference on Mobile Computing and Networking (MobiCom 99), Seattle, WA, USA, August 1999.
2. Jun Rekimoto and Masanori Saitoh. Augmented surfaces: A spatially continuous work space for hybrid computing environments. In CHI'99 Proceedings, Pittsburg, PA, USA, May 1999.

PDA web browser. 
1. Fox, A. and Brewer, E. Reducing WWW Latency and Bandwidth Requirements via Real-Time Distillation, in Proceedings of the Fifth International World Wide Web Conference, World Wide Web Consortium (Paris, France, 1996)
2. Zenel, B., and Duchamp, D. A General Purpose Proxy Filtering Mechanism Applied to the Mobile Environment in Proceedings of MOBICOM (1997), ACM Press, 248-259

* citations

New measure of temporal and apatial locatity. 
1. N. Davies, K. Cheverst, K. Mitchell, and A. Friday. Caches in the air: Disseminating information in the guide system. In Proceedings of the 2nd IEEE Workshop on Mobile Computing Systems and Applications (WMCSA '99), pages 11{19, New Orleans, USA, February 1999.
2. T. Ye, H.-A. Jacobsen, and R. Katz. Mobile awareness in a wide area wireless network of info-stations. In Proceedings of the Fourth International Conference on Mobile Computing and Networking (MobiCom '98), pages 109{120, Dallas, TX, USA, 1998.
3. Experiences of Developing and Deploying a ContextAware Tourist Guide: The GUIDE Project (2000) Keith Cheverst, Nigel Davies, Keith Mitchell, Adrian Friday

Hierarchy. 
1. W. Adjie-Winoto. A Self-configuring resolver architecture for resource discovery and routing in device networks. Master's thesis, Electrical Engineering and Computer Science, Massa-chusetts Institute of Technology, May, 2000.
2. N. Sturtevant, N. Tang, and L. Zhang. The Information Dis-covery Graph: Towards a Scalable Multimedia Resource Directory. Proceedings of the IEEE workshop on internet applications (WIAPP)'99, July, 1999.

 

Info stations
Mine, Mine, Mine: Information Theory, Infostation Networks, and
Resource Sharing

The Ninja Architecture for Robust Internet-Scale Systems and Services (2000)
Steven D. Gribble, Matt Welsh, Rob von Behren, Eric A. Brewer, David Culler,

The PARCTAB Ubiquitous Computing Experiment Roy Want, Bill N. Schilit, Norman I. Adams, Rich Gold, Karin Petersen, David Goldberg, John R. Ellis and Mark Weiser. Technical Report CSL-95-1, Xerox Palo Alto Research Center, March 1995.