Which of the following descriptions regarding the analysis of the reasons for the weak coverage of the drive test are correct? (Multiple choice)

Which of the following descriptions regarding the analysis of the reasons for the weak coverage of the drive test are correct? (Multiple choice)
A . Port switch parameter configuration, resulting in the inability to switch between questions in time
B . Problems between devices: abnormal working status of the device, AAU hardware failure, etc.
C . Congestion of port transmission resources
D . The port may be due to environmental reasons, such as building shelter

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Answer: ABD