Channel Selection HARQ Feedback in LTE-Advanced

Author

Berggren, Fredrik ; Liu, Jianghua

Author_Institution

Huawei Technol. Sweden AB, Kista, Sweden

fYear

2012

fDate

6-9 May 2012

Firstpage

1

Lastpage

6

Abstract

LTE-Advanced supports carrier aggregation which implies that ACK/NACK information bits for multiple downlink carriers are fed back in the uplink. One method for HARQ feedback with multiple ACK/NACK bits is channel selection, wherein ACK/NACK information is encoded by the joint selection of a channel (transmit sequence) and a QPSK symbol. We give a signal design for mapping ACK/NACK information to the channels and modulation symbols, in order to minimize and equalize the ACK-to-NACK and NACK-to-ACK error probabilities. It is shown how the performance depends on the set of channels assigned to a given ACK/NACK bit.

Keywords

Long Term Evolution; automatic repeat request; encoding; error statistics; quadrature phase shift keying; ACK-to-NACK error probability; ACK/NACK information bits; LTE-advanced; Long Term Evolution; NACK-to-ACK error probability; QPSK symbol; carrier aggregation; channel selection HARQ feedback; encoding; modulation symbols; multiple downlink carriers; Downlink; Error probability; OFDM; Phase shift keying; Signal design; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference (VTC Spring), 2012 IEEE 75th

Conference_Location

Yokohama

ISSN

1550-2252

Print_ISBN

978-1-4673-0989-9

Electronic_ISBN

1550-2252

Type

conf

DOI

10.1109/VETECS.2012.6240077

Filename

6240077