ansmission and (2) downlink control channel monitoring. It can be used by the network to quickly release the RRC connection and put the UE in idle mode, which consumes significantly less power. - Relaxed monitoring for cell reselection - Relaxed UE monitoring for cell reselec- tion (as low as once every 24 h), for example, for a stationary UE. Reduced Latency - Reduced system acquisition time using a new resynchronization signal (eMTC only) - This is a new physical Resynchronization Signal (RSS) with dense trans- mission to reduce the synchronization time. 14 Internet of Things Optimization Figure 14.26 Wake-up signal. PDCCH PDCCH Wake-up Paging Wake-up occasion occasion occasion - Improved system information demodulation performance - Acquisition time is reduced based on accumulation of multiple transmissions. - System information update indication - A flag bit in the MIB indicates whether the system information has been updated during the last 24) h. This allows the UE to skip reading system information if it has not been changed. - Scheduling request support via preconfigured random access channel transmission or via multiplexing of scheduling request onto HARQ-ACK (NB-IoT only). Improved Spectral Efficiency - Support for 64-QAM for the downlink data channel (eMTC only) - 64-QAM may be used in the downlink to improve system spectral efficiency; however, there is no increase in the peak data rate. - Flexible starting PRB resource allocation for a 1.4 MHz UE (eMTC only) - A UE can be allocated PRBs outside of a narrowband to improve efficiency. - CRS muting outside bandwidth-limited UE narrowband (eMTC only) - CRS out- side of bandwidth UE narrowband may be muted to reduce inter-cell interference. - Sub-PRB resource allocation (eMTC only) - Resource can be assigned using three or six subcarriers to improve efficiency and reduce the PAPR; p/2-BPSK modula- tion was also introduced. Improved load control with coverage enhancement level based access class bar- ring - UEs are barred from network access in enhanced co