quirements for each band such as PSD limitation or occupied channel bandwidth (OCB), defined as the bandwidth containing 99% of the signal power, which falls between 80% and 100% of the nominal channel bandwidth. Channel bandwidths below 5 MHz are not included in this study. The study further targets the design of channel access procedures for frequency bands based on coexistence and regu- latory considerations applicable to the band. The study includes identification of procedures for technology-neutral channel access for frequency bands that may become available sub- ject to new regulations. If the absence of a Wi-Fi system cannot be guaranteed in sub- 7 GHz band where NR-U is operating, the baseline assumption is that NR-U operating bandwidth is an integer multiple of 20 MHz. The following physical layer procedures may be impacted as a result of the study for NR-U: HARQ operation; configured grant support in NR-U; and channel access mechanisms. For the latter, LTE-based LAA LBT mechanism is used as the baseline. The study may further encompass enhancement of the baseline LBT mechanism; techniques to cope with directional antennas/transmissions: receiver-assisted LBT; on-demand receiver-assisted LBT, for example, receiver-assisted LBT enabled only when needed; and techniques to enhance spatial reuse, preamble detection, and enhance- ments to baseline LBT mechanism above 7 GHz. The citizens broadband radio service can potentially lower the barrier to entry for non-traditional wireless carriers. The limited propagation characteristics of the 3.5 GHz spectrum facilitate indoor and floor-by-floor deployment options that could compete with the existing Wi-Fi networks. Due to the significantly lower cost of PALs compared to licensed spectrum costs, private operators now have access to 150 MHz of spectrum on every floor. This may allow enterprise applications, industrial Internet of things, and densely populated venues. Trials are already happening in the industrial IoT and smart home areas. PALs fit the need for loca