Скачать с ютуб 5G Call flow - 1st part - Part of 5G course - link is in description в хорошем качестве

5G Call flow - 1st part - Part of 5G course - link is in description

**Complete course of 5G is available at- https://www.itelcotech.com/learningpa... 5G: Initial access and Registration procedure UE needs to register with the network to receive services, to enable mobility tracking and reachability. In a case when UE powers ON, it needs to determine the public land mobile network (PLMN) it has to register with. · Initial access consists of cell search and acquisition to first allow a UE to synchronize with the target cell. Primary sync signal (PSS) and Secondary sync signal (SSS) helps to establish DL sync. · Master Information Block (MIB) from NR helps UE to acquire the information needed to access the network. · System information block (SIB) in DL includes configurations for the UE such as cell selection & re-selection, random access parameters, PLMN identity and access class barring list. Once all criterions are met, cell is selected by UE. · Initial access from UE to NR starts from Random Access procedure. NR decodes the preamble and UL sync is performed. · Radio resource control (RRC) is setup and then an initial NAS message establish a signaling connection between UE and AMF. Attached figure depicts further interactions among network functions in the 5GC.