we already know, this is the operation intended to cover a special area, with beams transmitted during a time interval in a predetermined way Physical channels and signals for the initial access procedure For these purposes, devices in idle mode will use the signals in the SS block. For connected devices, beam management is based on a Channel State Information Reference Signal (CSI-RS) in the downlink and Sounding Reference Signals (SRS) in the uplink. This also indicates that those signals must support beam sweeping, and the beam report will contain the measurement results from them. Multi-beam operations and FDM Working in a multi-beaming scenario as we are currently doing can potentially force a device to receive and transmit simultaneously in two different spatial directions. For Release 15, devices will not be mandated to support this operation, since typical device implementation at first will have a single panel. From a device point of view, it cannot, for instance, measure SS blocks on one beam and then receive the PBCH on a different beam. Note that this is only from the device's point of view. From a gNB point of view, nothing prevents it from transmitting on two different devices simultaneously in different spatial directions if it supports it. So far, we have covered the initial access procedure and its relationship with beam sweeping and beam management. Now, we will observe the role of some physical channels and synchronization signals in the initial access procedure. Physical channels and signals for the initial access procedure We have covered the general aspects of the initial access procedure. In this section, we will be discussing the details of how the SS blocks and the PRACH are defined. The channels that define SS block are the Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS), and they are placed at the PBCH. These downlink signals are the only ones that are periodically transmitted in NR. Note that they can be turned off by the network thanks to NR's ultra-lea