The miss detection performance is degraded significantly for multiplexing of large number of sequences. To improve miss detection performance of NB-IoT WUS like sequence, the orthogonal sequence (e.g., Hadamard sequence or cyclic shift of ZC sequence) can be considered as base sequences. For example, Hadamard sequence with length N=256 bits can support 256 wake up IDs (UEs ID/UE groups ID) with miss detection performance shown in Figure 9. In the simulation, length-31 TRS gold sequence is adopted as the baseline. We can see that orthogonal sequence based enhanced NB-IoT WUS sequence outperforms TRS gold sequence based enhanced NB-IoT WUS sequence in miss detection performance for different sequence multiplexing capacity. With the increase of multiplexing capacity, the performance gain of the orthogonal sequence over the gold sequences will get much larger. In contrast to NB-IoT, more frequency resource can be used for transmitting WUS in NR and the miss detection performance can be improved further.