Rethinking Mobile Telephony with the IMP

Abstract

The recent widespread deployment of wireless LAN technology raises the question of how a mobile telephony system might instead be architected to use wireless LAN access points and the Internet to achieve similar services. In this paper, we examine an end-to-end architecture for mobile telephony, with a strong focus on endpoint issues. We have designed, implemented, and have experience using devices we call Internet Mobile Phones or IMPs. The IMP system provides encrypted wireless voice communication over 802.11B LANs. IMPs run Linux on a lightweight single-board computer running customized voice over IP software; data is encrypted with 128-bit Blowfish. The paper reports on our design decisions and the resulting implementation of the IMPs, with sufficient detail to reproduce the devices. We report our experiences with using them for several months in a laboratory environment, and close with proposals for future experiments to investigate scale and extensibility.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2011
Accession Number
ADA535263

Entities

People

  • G. Wai
  • J. M. Smith
  • M. Deyoung
  • N. Henke

Organizations

  • University of Pennsylvania

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Coding
  • Computer Programming
  • Computer Programs
  • Computers
  • Computing System Architectures
  • Cryptography
  • Mobile Devices
  • Mobile Phones
  • Network Architecture
  • Network Protocols
  • Operating Systems
  • Security Protocols
  • Telephone Systems
  • Transport Protocols
  • User Interface
  • Voice Communications
  • Voice Over Internet Protocol

Fields of Study

  • Computer science

Readers

  • Computer Networking