Low-Power Wake-Up Signal Puncturing for Accurate OFDM Decoding

The patent changes the power parameter from a fixed value to a variable that can take different values (first power parameter and second power parameter). By transmitting wake-up signals at different power levels and comparing the received power to a threshold, the system can determine the number of information bits encoded in the signal. This parameter change enables accurate information bit determination while maintaining low power consumption, as the system only needs to transmit at elevated power briefly for the wake-up indication rather than continuous high-power transmission.

The patent applies preliminary action by determining the puncturing scheme based on power parameters before the actual decoding process. The base station determines the puncturing scheme according to the power parameter of the wake-up signal, and this information is used to configure the resource allocation and puncturing pattern in advance. This preliminary determination simplifies the receiving end's task, as the WTRU can use the pre-determined puncturing scheme information to efficiently decode the signal without needing to perform complex real-time analysis of power variations.

The patent enhances signal detection reliability by introducing power parameter variations into the on-off keyed wake-up signal. Instead of using simple on-off keying, the system modulates the signal with different power levels (first and second power parameters) that correspond to different information bit values. The base station transmits the wake-up signal with power parameters that encode the information bits, and the WTRU detects these power variations to reliably determine the transmitted information. This power-based modulation maintains the low-power efficiency of on-off keying while improving detection reliability through distinguishable power levels.