US 11,811,688 B2
Reduced density channel state information reference signal
Siva Muruganathan, Stittsville (CA); Mattias Frenne, Uppsala (SE); Shiwei Gao, Nepean (CA); and Robert Mark Harrison, Grapevine, TX (US)
Assigned to Telefonaktiebolaget LM Ericsson (Publ), Stockholm (SE)
Appl. No. 16/088,348
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Mar. 30, 2017, PCT No. PCT/SE2017/050307
§ 371(c)(1), (2) Date Sep. 25, 2018,
PCT Pub. No. WO2017/171617, PCT Pub. Date Oct. 5, 2017.
Claims priority of provisional application 62/317,063, filed on Apr. 1, 2016.
Prior Publication US 2020/0304258 A1, Sep. 24, 2020
Int. Cl. H04L 5/00 (2006.01)
CPC H04L 5/0048 (2013.01) [H04L 5/0007 (2013.01); H04L 5/0057 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for use in a network node of transmitting channel state information reference signals (CSI-RS), the method comprising:
transmitting a number M of CSI-RS ports to one or more wireless devices, wherein a fraction of the M ports are transmitted over a first physical resource block (PRB) and a remaining fraction of the M ports are transmitted over a second PRB;
M being equal to twenty-eight;
the first PRB including resource elements, the resource elements of the first PRB including at least four groups of aggregated CSI-RS resources, each of the at least four groups including four resource elements, and each of the at least four groups carrying four antenna ports; and
the second PRB including resource elements, the resource elements of the second PRB including at least three groups of aggregated CSI-RS resources, each of the at least three groups including four resource elements, and each of the at least three groups carrying four antenna ports.