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1. (WO2013117231) METHOD AND APPARATUS FOR TRANSMITTING A REFERENCE SIGNAL IN A COMMUNICATION SYSTEM

Pub. No.:    WO/2013/117231    International Application No.:    PCT/EP2012/052250
Publication Date: Fri Aug 16 01:59:59 CEST 2013 International Filing Date: Sat Feb 11 00:59:59 CET 2012
IPC: H04L 5/00
Applicants: NOKIA SOLUTIONS AND NETWORKS OY
PAJUKOSKI, Kari Pekka
HOOLI, Kari Juhani
TIIROLA, Esa Tapani
KINNUNEN, Pasi Eino Tapio
NISSILÄ, Mauri Johannes
Inventors: PAJUKOSKI, Kari Pekka
HOOLI, Kari Juhani
TIIROLA, Esa Tapani
KINNUNEN, Pasi Eino Tapio
NISSILÄ, Mauri Johannes
Title: METHOD AND APPARATUS FOR TRANSMITTING A REFERENCE SIGNAL IN A COMMUNICATION SYSTEM
Abstract:
A method for reference signal transmission is disclosed, wherein a demodulation reference signal DMRS and a sounding reference signal SRS is transmitted in a same time domain resource from a user terminal to an LTE base station. A single reference signal sequence is used both for demodulation and detection of a data channel, and for channel sounding, such that a reference signal sequence part used for the demodulation and detection of the data channel is in a power offset compared to a reference signal sequence part used for the channel sounding. Code division multiplexing is applied on a reference signal sequence by using a cyclic shift of a whole length of the sequence. The cyclic shift is selected such that reference signal sequences allocated to the different user terminals are orthogonal over a minimum allocation granularity of the data channel.