US 9,814,030 B2
Method and apparatus for transmitting or receiving reference signal in wireless communication system
Hanjun Park, Anyang-si (KR); Kijun Kim, Anyang-si (KR); and Jonghyun Park, Anyang-si (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Appl. No. 14/431,223
Filed by LG ELECTRONICS INC., Seoul (KR)
PCT Filed Sep. 27, 2013, PCT No. PCT/KR2013/008678
§ 371(c)(1), (2) Date Mar. 25, 2015,
PCT Pub. No. WO2014/051374, PCT Pub. Date Apr. 3, 2014.
Claims priority of provisional application 61/706,132, filed on Sep. 27, 2012.
Prior Publication US 2015/0257132 A1, Sep. 10, 2015
Int. Cl. H04W 72/04 (2009.01); H04B 7/06 (2006.01); H04L 5/00 (2006.01); H04L 27/26 (2006.01)
CPC H04W 72/042 (2013.01) [H04B 7/068 (2013.01); H04B 7/0684 (2013.01); H04L 5/0048 (2013.01); H04L 5/0053 (2013.01); H04L 27/2601 (2013.01); H04W 72/0446 (2013.01); H04L 27/2602 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for transmitting a channel state information reference signal (CSI-RS) in a specific downlink subframe having an extended cyclic prefix (CP) in a wireless communication system, the method comprising:
generating, by a base station, a CSI-RS sequence for an additional CSI-RS and mapping the generated CSI-RS sequence to CSI-RS complex-valued modulation symbols; and
mapping, by the base station, the CSI-RS complex-valued modulation symbols to a first CSI-RS resource element (RE) mapping pattern set composed of a plurality of CSI-RS RE mapping patterns and a second CSI-RS RE mapping pattern set composed of a plurality of CSI-RS RE mapping patterns; and
transmitting, by the base station to a user equipment (UE), the CSI-RS complex-valued modulation symbols mapped to the first and second CSI-RS RE mapping pattern sets as the additional CSI-RS using more than eight antenna ports when a specific downlink control information format is configured,
wherein the CSI-RS RE mapping patterns are composed of REs to which CSI-RS complex-valued modulation symbols are mapped,
wherein the first CSI-RS RE mapping pattern set is positioned in fifth and sixth orthogonal frequency division multiplexing (OFDM) symbols of each slot of a physical resource block (PRB) pair in the subframe,
wherein each CSI-RS RE mapping pattern of the first CSI-RS RE mapping pattern set includes REs with 2 consecutive OFDM symbol indices from among REs with specific subcarrier indices k of each slot, the specific subcarrier indices k corresponding to 0, 2, 3, 5, 6, 8, 9 and 11 in a first slot and to 0, 1, 3, 4, 6, 7, 9 and 10 in a second slot,
wherein the second CSI-RS RE mapping pattern set is positioned in fifth and sixth OFDM symbols of each slot of a PRB pair in the subframe, and
wherein each CSI-RS RE mapping pattern of the second CSI-RS RE mapping pattern set includes REs with 2 consecutive OFDM symbol indices from among REs with specific subcarrier indices k of each slot, the specific subcarrier indices k corresponding to 1, 4, 7 and 10 in a first slot and to 2, 5, 8 and 11 in a second slot.