Link Level Performance Assessment of Reliability-Based HARQ Schemes in LTE

Author

Woltering, Matthias ; Wubben, Dirk ; Dekorsy, Armin ; Braun, Volker ; Doetsch, Uwe

Author_Institution

Univ. of Bremen, Bremen, Germany

fYear

2014

fDate

18-21 May 2014

Firstpage

1

Lastpage

5

Abstract

This paper discusses two approaches of reliability-based HARQ, adapting the packet size of a retransmission in a 3GPP Long Term Evolution (LTE) system. We focus on the adaptation of the retransmission size in terms of physical resources by using information 1) of the channel, namely the signal-to-noise ratio (SNR) or 2) reliability information from the decoder output, taking the overall transmission into account. Both approaches will be compared to the HARQ system used in LTE in terms of throughput performance. Link level simulations will be performed with single bit feedback and 2 bit multilevel ACK/NAK. This work takes realistic impairments such as channel estimation, signal-to-noise ratio (SNR) estimation and implementation of a Turbo en- and decoder into regard.

Keywords

3G mobile communication; Long Term Evolution; automatic repeat request; channel estimation; codecs; telecommunication network reliability; turbo codes; 3GPP Long Term Evolution system; HARQ system; LTE system; SNR estimation; channel estimation; decoder output; hybrid automatic repeat request; link level performance assessment; multilevel ACK-NAK; packet size; physical resources; reliability information; reliability-based HARQ schemes; retransmission size; signal-to-noise ratio; turbo decoder; turbo encoder; Decoding; Delays; Error probability; Reliability; Signal to noise ratio; Throughput; Uplink;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference (VTC Spring), 2014 IEEE 79th

Conference_Location

Seoul

Type

conf

DOI

10.1109/VTCSpring.2014.7022973

Filename

7022973