Abstract
The next‐generation radio access network (NG‐RAN) radio access network is divided into two strata: the access stratum, and the non‐access stratum. The Uu radio interface is the interface between the mobile and the NG‐RAN access node. Like 4G base stations, an NG‐RAN node carries resource management and logic control functions and can communicate directly with another node. An NG‐RAN node can be split into an NG‐RAN centralized unit and one or more NG‐RAN distributed unit. The NG‐RAN access node establishes an association with the access and mobility management function (AMF). Several associations are created in order to connect the access node to several AMF functions. The mobility procedures are used to manage the mobile when it is in the connected state or inactive state. The 5G core network provides data transmission services by establishing tunnels between the mobile and a data network.
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