Cooperation and coordination in cognitive networks with packet retransmission

Marco Levorato, Osvaldo Simeone, Urbashi Mitra, Michele Zorzi

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

8 Scopus citations


The cognitive framework, which fosters an efficient use of the channel resource by granting access to smart and adaptive terminals, has been recently integrated with the cooperative paradigm. Accordingly, following a spectrum-leasing approach, licensed (primary) users may let unlicensed (secondary) users access the owned bandwidth in exchange for an increased performance via cooperation. Nevertheless, assuming that secondary transmission is limited to idle primary slots, as the traffic from the primary sources increases, implementation of spectrum leasing via cooperation becomes more challenging. In fact, the opportunities for secondary transmission reduce and the secondary users may find spectrum leasing not advantageous. In this paper, a solution is proposed that exploits fading temporal correlation and retransmission-based error control in order to increase secondary throughput even in high primary traffic conditions. Focusing on a simple network with a primary and a secondary source transmitting to a common destination, it is shown that the primary source may actively leave part of its channel resource to the secondary source without significant performance loss while greatly improving secondary throughput.

Original languageEnglish (US)
Title of host publication2009 IEEE Information Theory Workshop, ITW 2009
Number of pages5
StatePublished - Dec 7 2009
Event2009 IEEE Information Theory Workshop, ITW 2009 - Taormina, Sicily, Italy
Duration: Oct 11 2009Oct 16 2009

Publication series

Name2009 IEEE Information Theory Workshop, ITW 2009


Other2009 IEEE Information Theory Workshop, ITW 2009
CityTaormina, Sicily

All Science Journal Classification (ASJC) codes

  • Computational Theory and Mathematics
  • Computer Networks and Communications
  • Information Systems
  • Electrical and Electronic Engineering


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