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Performance Analysis of User Selected Subband Channel Quality Indicator Feedback Scheme of LTE

Donthi, Sushruth N and Mehta, Neelesh B (2010) Performance Analysis of User Selected Subband Channel Quality Indicator Feedback Scheme of LTE. In: IEEE Global Telecommunications Conference (GLOBECOM 2010), DEC 06-10, 2010, Miami, FL.

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Frequency-domain scheduling and rate adaptation have helped next generation orthogonal frequency division multiple access (OFDMA) based wireless cellular systems such as Long Term Evolution (LTE) achieve significantly higher spectral efficiencies. To overcome the severe uplink feedback bandwidth constraints, LTE uses several techniques to reduce the feedback required by a frequency-domain scheduler about the channel state information of all subcarriers of all users. In this paper, we analyze the throughput achieved by the User Selected Subband feedback scheme of LTE. In it, a user feeds back only the indices of the best M subbands and a single 4-bit estimate of the average rate achievable over all selected M subbands. In addition, we compare the performance with the subband-level feedback scheme of LTE, and highlight the role of the scheduler by comparing the performances of the unfair greedy scheduler and the proportional fair (PF) scheduler. Our analysis sheds several insights into the working of the feedback reduction techniques used in LTE.

Item Type: Conference Paper
Series.: IEEE Global Telecommunications Conference (Globecom)
Publisher: IEEE
Additional Information: Copyright 2010 IEEE. Personal use of this material is permitted.However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 06 Apr 2011 09:14
Last Modified: 06 Apr 2011 09:14
URI: http://eprints.iisc.ac.in/id/eprint/36612

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