Which of the following are possible causes of NRDUCELL unavailability? (Choose All that Apply)

The NRDUCELL is a logical object representing a 5G cell in the Distributed Unit (DU). Its availability depends on the successful setup and operation of all underlying physical and logical resources. A fault in the RF module (A) or the Baseband Processing (BBP) unit (B) constitutes a critical hardware failure. Insufficient CPRI bandwidth (C) prevents the transport link between the DU and the Radio Unit (RU) from supporting the cell. A clock exception (D) disrupts the synchronization essential for network operation. A failure in any of these components will prevent the cell from becoming operational.

There are no incorrect options. Each choice represents a fundamental dependency for cell operation. A failure in the radio hardware, baseband hardware, transport link, or synchronization system is a valid and common cause for a cell to be unavailable.

1. Huawei Technologies Co., Ltd. (2022). 5G RAN Troubleshooting Guide. Section on "Cell Setup Failures." This guide details the end-to-end process of cell setup and lists common failure points, including hardware, transport, and synchronization.

2. Huawei Technologies Co., Ltd. (2022). Base Station Alarm/Event Reference. Description for ALM-29952 NR DU Cell Unavailable. The documentation for this specific alarm lists hardware faults (BBP, RRU/AAU), transmission link faults (CPRI/eCPRI), and clock failures as primary causes.