US 11,956,047 B2
Methods for adapting density of demodulation reference signals
Lars Lindbom, Karlstad (SE); Mattias Frenne, Uppsala (SE); Martin Hessler, Linköping (SE); and Karl Werner, Segeltorp (SE)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed on Jan. 20, 2022, as Appl. No. 17/579,781.
Application 17/579,781 is a continuation of application No. 17/112,455, filed on Dec. 4, 2020, granted, now 11,233,555.
Application 17/112,455 is a continuation of application No. 16/308,203, granted, now 10,879,986, previously published as PCT/EP2017/075700, filed on Oct. 9, 2017.
Claims priority of provisional application 62/406,753, filed on Oct. 11, 2016.
Prior Publication US 2022/0149916 A1, May 12, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H04B 7/06 (2006.01); H04L 5/00 (2006.01); H04L 5/10 (2006.01); H04L 25/02 (2006.01); H04B 7/0413 (2017.01)
CPC H04B 7/0684 (2013.01) [H04L 5/0016 (2013.01); H04L 5/0023 (2013.01); H04L 5/0051 (2013.01); H04L 5/0092 (2013.01); H04L 5/10 (2013.01); H04L 25/0224 (2013.01); H04B 7/0413 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method, in a first wireless node, the method comprising:
selecting a set of one or more reference signal antenna ports for use in transmitting data to or receiving data from one or more other wireless nodes in a given transmit time interval, from a plurality of sets of reference signal antenna ports that are available for use, wherein the plurality of sets of reference signal antenna ports have different reference signal densities in a frequency dimension; and
sending a message to a second wireless node indicating a reference signal assignment to the second wireless node, wherein the message includes an indication of the selected set of reference signal antenna ports.