 For the purpose of downlink power allocation, the ratio of PDSCH EPRE to DM-RS EPRE (PDM-RS dB]) is given in Table 4.33 for downlink DM-RS associated with PDSCH, which depends on the number of DM-RS CDM groups without data [9]. It can be shown that the New Radio Access Physical Layer Aspects (Part 2) 651 Table 4.33: Ratio of PDSCH EPRE to DM-RS EPRE [9]. Number of DM-RS CDM DM-RS Configuration DM-RS Configuration Groups without Data Type 1 (dB) Type 2 (dB) - 4.77 Table 4.34: PT-RS EPRE to PDSCH EPRE per layer per resource element [9]. EPRE-Ratio PPT-RS Number of PDSCH Layers Reserved Reserved DM-RS power scaling factor applied prior to DM-RS resource mapping is given by BDM-RS PDSCH = 10(-PDM-Rs/20). When the UE is scheduled with a PT-RS port associated with the PDSCH, the ratio of PT- RS EPRE to PDSCH EPRE per layer per resource element for PT-RS port PPT-RS is given by Table 4.34. In that case, the PT-RS power scaling factor BPT-RS is given by BPT-RS = 10 PPT-RS/20); otherwise, it can be assumed that epre-Ratio is set to state "0" in Table 4.34. References 3GPP Specifications [1] 3GPP TS 38.101-1, NR, User Equipment (UE) Radio Transmission and Reception; Part 1: Range 1 Standalone (Release 15), December 2018. [2] 3GPP TS 38.101-2: NR, User Equipment (UE) Radio Transmission and Reception; Part 2: Range 2 Standalone (Release 15), December 2018. 3GPP TS 38.104, NR, Base Station (BS) Radio Transmission and Reception (Release 15), December 2018. 3GPP TS 38.133, NR, Requirements for Support of Radio Resource Management (Release 15), December 2018. 3GPP TS 38.202, NR, Services Provided by the Physical Layer (Release 15), December 2018. [6] 3GPP TS 38.211, NR, Physical Channels and Modulation (Release 15), December 2018. 3GPP specifications can be accessed at the following URL: http://www.3gpp.org/ftp/Specs/archive/. 652 Chapter 4 [7] 3GPP TS 38.212, NR, Multiplexing and Channel Coding (Release 15), December 2018. [8] 3GPP TS 38.213, NR, Physical Layer Procedures for Control (Release 15), December 2018. [9] 3GPP TS 38