Additionally, a respective range of scheduling information may be configured for each of the broadcast PDSCH and the unicast PDSCH, whereby control information overhead for decoding of the broadcast PDSCH may be reduced. For example, the broadcast PDSCH may be fixed to a low modulation order considering a UE of a low SNR, or the range is indicated to be limited to relatively low modulation orders. For example, since 256 QAM or more is not suitable for the broadcast PDSCH, 256 QAM or more is not indicated to control information. As a result, control information overhead for modulation order may be reduced.

Meanwhile, DM-RS configuration types 1 and 2 are defined in the recent NR system. The DM-RS configuration type 1 is multiplexed into comb 2 (that is, RPF=2), and the DM-RS configuration type 2 is multiplexed into comb 3 (that is, RPF=3). Also, OCC is applied to each type, whereby 2 ports may be allocated to each symbol. In this case, comb 2 means that two DM-RS sequences are multiplexed into a frequency axis in a unit of 2 REs, and comb 3 means that two DM-RS sequences are multiplexed into a frequency axis in a unit of 3 REs.

In this case, as the broadcast PDSCH is limited to low-rank transmission such as rank 1, it is not required to define many DM-RS ports. Therefore, DM-RS of the broadcast PDSCH is limited to DM-RS configuration 1. Alternatively, DM-RS of the broadcast PDSCH is limited to 1 symbol front loaded DM-RS of DM-RS configuration 2 having less DM-RS ports.