Impact of retransmission limit on preamble contention in LTE-advanced network

Revak R. Tyagi, Frank Aurzada, Ki Dong Lee, Sang G. Kim, Martin Reisslein

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


LTE-Advanced networks employ random access based on preambles transmitted according to multi-channel slotted Aloha principles. The random access is controlled through a limit W on the number of transmission attempts and a timeout period for uniform backoff after a collision. We model the LTE-Advanced random access system by formulating the equilibrium condition for the ratio of the number of requests successful within the permitted number of transmission attempts to those successful in one attempt. We prove that for W ≤ 8 there is only one equilibrium operating point and for W ≥ 9 there are three operating points if the request load ρ is between load boundaries ρ1 and ρ2. We analytically identify these load boundaries as well as the corresponding system operating points. We analyze the throughput and delay of successful requests at the operating points and validate the analytical results through simulations.

Original languageEnglish (US)
Article number6636064
Pages (from-to)752-765
Number of pages14
JournalIEEE Systems Journal
Issue number3
StatePublished - Sep 1 2015


  • Equilibrium operating points
  • random access system
  • slotted Aloha
  • throughput-delay analysis

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Information Systems
  • Computer Science Applications
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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