Outage behavior with delay and CSIT

Dinesh Rajan, Ashutosh Sabharwal, Behnaam Aazhang

Research output: Contribution to journalConference articlepeer-review

9 Scopus citations


In this paper, we demonstrate that the packet outage probability for fading channels can be significantly reduced by exploiting queuing delay and transmitter channel information. Queuing delay gain is conceptually similar to delay diversity, but at a packet time-scale instead of symbol time-scale. First, we compute a lower bound on outage probability assuming full channel state information at the transmitter (CSIT). We then construct simple outage minimizing transmission policies which adapt the rate and power of the transmitted signal based jointly on buffer occupancy and channel conditions. We demonstrate that the rate of decrease of outage with increasing transmitter channel information is higher for larger delays. We also address the closely coupled problem of designing a practical feedback channel which supplies the CSIT.

Original languageEnglish (US)
Pages (from-to)578-582
Number of pages5
JournalIEEE International Conference on Communications
StatePublished - 2004
Event2004 IEEE International Conference on Communications - Paris, France
Duration: Jun 20 2004Jun 24 2004

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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