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CQI Reporting Imperfections and their Consequences in LTE Networks

Authors:
Kari Aho
Olli Alanen
Jorma Kaikkonen

Keywords: Link adaptation, BLER target

Abstract:
In modern wireless networks, the signal quality in wireless channel is estimated based on the channel quality measurements. The measurement results are used to select appropriate modulation and coding scheme for each transmission. The target of the link adaptation is to reach the desired block error rate operation point. Operation point and system performance could potentially be compromised by non-consistent / biased channel quality indicator reporting caused by, e.g., differently calibrated user equipments or hardware inaccuracies. This paper evaluates the extent of that phenomenon through different combinations of traffic types, bias settings and system loads by the means of fully dynamic system simulations. The in-depth results verified that on the system level the performance is not significantly impacted by reporting imperfections. Long term evolution is used as an example technology in this study, but the same concepts are applicable to other wireless technologies also.

Pages: 241 to 245

Copyright: Copyright (c) IARIA, 2011

Publication date: January 23, 2011

Published in: conference

ISSN: 2308-4413

ISBN: 978-1-61208-113-7

Location: St. Maarten, The Netherlands Antilles

Dates: from January 23, 2011 to January 28, 2011