Cell Barred in 5G (NR) systems refers to restricting or prohibiting a mobile device (UE) from accessing a specific cell in the network. This restriction, for various reasons, is also an operational mechanism controlled by the network to manage and control the access of user equipment to a specific cell. The main reasons for turning on Cell Barred (access prohibition) are as follows;
I. ACCESS CONTROL MECHANISMS Cell banning is an access control mechanism implemented by the network to specify which devices can connect to a particular cell and under what conditions.
II.Cell blocking may be triggered by different factors, such as network congestion, maintenance activities, security issues or specific operational policies defined by the network operator. In addition, during maintenance work on a particular cell or when the cell is heavily congested, the network operator may decide to block access to the cell in order to prevent unintended connections and ensure network stability.
III.Cell prohibition types can be applied in different situations in 5G networks, including: access prohibition, re-selection prohibition and access and re-selection prohibition;
* Access prohibition prevents new devices from connecting to a prohibited cell; while reselection prohibition restricts existing connected devices from reselecting a prohibited cell during switching or reselection.
* Timer-based prohibition in cell prohibition typically involves the use of a timer; the network may decide to prohibit terminal (UE) access to the cell for a specific period of time, after which the restriction will be lifted. Timer-based cell barring allows for temporary restrictions, ensuring that terminal devices are barred from the cell only for the necessary time.
IV. Network Management Enhancements Cell blocking is a tool for network operators to dynamically manage and optimize the use of network resources. It helps prevent overloading of specific cells to ensure a balanced distribution of traffic.
V. Terminals (UEs) and Cell Barred When a cell is barred, the network (NG-RAN) communicates the relevant information to the subscribers (UEs) via a system message. Upon receiving the barred information, the terminals (UEs) will comply with the restriction and refrain from attempting to access or reselect an unbarred cell.
Cell Barred for 5G is the temporary restriction or prohibition of user devices from accessing specific cells within the wireless network; this mechanism is used for network management purposes to ensure stability, efficiency and optimal performance of the 5G (NR) network.
