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This article is presented by:
Professor Randy H. Katz
Computer Science Division
University of California, Berkeley
Berkeley, CA 94720-1776
1996

CS 294-7: Challenges of Mobile
Computing

Research Issues in
Mobile Computing
Wireless Communications
Quality of connectivity
Bandwidth limitations
Mobility
Location transparency
Location dependency
Portability
Power limitations
Display, processing, storage limitations
Classes of
Mobile Devices
Display Only
InfoPad model: limited portable processing
Constrained to operation within prepared infrastructure,
like a cordless phone
Advantages with respect to power consumption, upgrade
path, lightweight, impact of lost/broken/stolen device
Laptop Computer
Thinkpad model: significant portable processing,
operates independently of wireless infrastructure
Disadvantages: power consumption, expensive,
significant loss exposure, typically greater than 5 pounds
Personal Digital Assistant
Somewhere between these extremes
Wireless Communications
Harsh communications environment:
Lower bandwidth/higher latency:
good enough for videoconferencing?
Higher error rates
More frequent disconnection
Performance depends on density of nearby users but inherent
scalability of cellular/frequency reuse architecture helps
Connection/Disconnection
Network failure is common
Autonomous operation is highly desirable
Caching is a good idea, e.g., web cache
Asynchronous/spool-oriented applications, like mail or printing
Trickle back data when bandwidth is available
Disconnected file systems: CODA (CMU), Ficus (UCLA)
For more information about this article,please follow the link:
http://googleurl?sa=t&source=web&cd=1&ve...rkeley.edu%2F randy%2FCourses%2FCS294.S96%2FMobiComp.pdf&ei=TfuzTOjAIJLovQOdhMnGCg&usg=AFQjCNG0wvArUXvdYrJOcQVc-pcsUok51Q

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ARCHITECTURE, CHALLENGES AND RESEARCH ISSUES ON MOBILE COMPUTING

Abstract

With the advent of the Internet and the plurality and variety of fancy applications it brought with it, the demand for more advanced services on cellular phones increasingly becoming urgent. Unfortunately, so far the introduction of new enabling technologies did not succeed in boosting new services. The adoption of Internet services has shown to be more difficult due to the difference between the Internet and the mobile telecommunication system. The goal of this paper is to examine the characteristics of the mobile system and to clarify the constraints that are imposed on existing mobile services. The paper will also investigate successively the enabling technologies and the improvements they brought. Most importantly, the paper will identify their limitations and capture the fundamental requirements for future mobile service architectures namely openness, separation of service logic and content, multi-domain services, personalization, Personal Area Network (PAN)-based services and collaborative services. The paper also explains the analysis of current mobile service architecture such as voice communication; supplementary services with intelligent network, enabling services on SIM with SIM application tool kit, text services with short message service, internet services with WAP and dynamic applications on mobile phones with J2ME.
Further our paper gives information on challenges of mobile Computing which includes harsh communications, connections, bandwidth and Heterogeneous networks. Under research issues seamless connectivity over multiple Overlays, scalable mobile processing, wireless communications, mobility and portability are discussed.