Characterizing radio resource allocation for 3G networks

Feng Qian, Zhaoguang Wang, Alexandre Gerber, Z. Morley Mao, Subhabrata Sen, Oliver Spatscheck

Research output: Chapter in Book/Report/Conference proceedingConference contribution

191 Scopus citations


3G cellular data networks have recently witnessed explosive growth. In this work, we focus on UMTS, one of the most popular 3G mobile communication technologies. Our work is the first to accurately infer, for any UMTS network, the state machine (both transitions and timer values) that guides the radio resource allocation policy through a light-weight probing scheme. We systematically characterize the impact of operational state machine settings by analyzing traces collected from a commercial UMTS network, and pinpoint the inefficiencies caused by the interplay between smartphone applications and the state machine behavior. Besides basic characterizations, we explore the optimal state machine settings in terms of several critical timer values evaluated using real network traces. Our findings suggest that the fundamental limitation of the current state machine design is its static nature of treating all traffic according to the same inactivity timers, making it difficult to balance tradeoffs among radio resource usage efficiency, network management overhead, device radio energy consumption, and performance. To the best of our knowledge, our work is the first empirical study that employs real cellular traces to investigate the optimality of UMTS state machine configurations. Our analysis also demonstrates that traffic patterns impose significant impact on radio resource and energy consumption. In particular, We propose a simple improvement that reduces YouTube streaming energy by 80% by leveraging an existing feature called fast dormancy supported by the 3GPP specifications.

Original languageEnglish (US)
Title of host publicationIMC'10 - Proceedings of the 2010 ACM Internet Measurement Conference
Number of pages14
StatePublished - Dec 1 2010
Externally publishedYes
Event10th Internet Measurement Conference, IMC'10 - Melbourne, VIC, Australia
Duration: Nov 1 2010Nov 3 2010

Publication series

NameProceedings of the ACM SIGCOMM Internet Measurement Conference, IMC


Other10th Internet Measurement Conference, IMC'10
CityMelbourne, VIC


  • 3G Networks
  • Inactivity timers
  • Multimedia streaming
  • RRC state machine
  • Smartphones
  • Tail effects
  • UMTS

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