Section: 9.8 Demodulation reference signals
Content: Demodulation reference signals associated with PSSCH, PSCCH, PSDCH, and PSBCH transmission shall be transmitted according to PUSCH in clause 5.5.2.1 with the following exceptions: - The parameters in Tables 9.8-1, 9.8-2, and 9.8-3 shall be used. - The term PUSCH shall be replaced by PSSCH, PSCCH, PSDCH or PSBCH, depending on the physical channel to which the reference signal is associated. - Antenna ports are given by Table 9.2-1. - The set of physical resource blocks used in the mapping process shall be identical to the corresponding PSSCH/PSCCH/PSDCH/PSBCH transmission. - The index in the mapping process in clause 5.5.2.1.2 corresponding to the case where higher-layer parameter ul-DMRS-IFDMA is not set shall be identical to that for the corresponding PSSCH/PSCCH/PSDCH/PSBCH transmission. - For sidelink transmission modes 3 and 4 on the PSSCH and PSCCH, the mapping shall use and for the first slot in the subframe and and for the second slot in the subframe. - For sidelink transmission modes 3 and 4 on the PSBCH, the mapping shall use and for the first slot in the subframe and for the second slot in the subframe. - For sidelink transmission modes 1 and 2, the pseudo-random sequence generator in clause 5.5.1.3 shall be initialized at the start of each slot fulfilling . For sidelink transmission modes 3 and 4 the pseudo-random sequence generator in clause 5.5.1.3 shall be initialized at the start of each slot fulfilling . - For sidelink transmission modes 3 and 4 on the PSCCH, the cyclic shift to be applied for all DM-RS in a subframe shall be chosen according to clause 14.2.1 of [4]. - For sidelink transmission modes 1and 2 and sidelink discovery, the quantity in clause 5.5.2.1.1 takes the values and for sidelink transmission modes 3and 4, the quantity in clause 5.5.2.1.1 takes the values for PSSCH and for PSBCH. - For sidelink transmission modes 3 and 4, the quantity equals the decimal representation of CRC on the PSCCH transmitted in the same subframe as the PSSCH according to with and given by clause 5.1.1 in [3]. Table 9.8-1: Reference signal parameters for PSSCH. Table 9.8-2: Reference signal parameters for PSCCH. Table 9.8-3: Reference signal parameters for PSDCH and PSBCH.