During the road test, it was found that the level of the A cell has reached -115dBm, but it cannot be switched to a neighboring area B. Which of the following reasons and processing methods are correct? (Multiple choice)

During the road test, it was found that the level of the A cell has reached -115dBm, but it cannot be switched to a neighboring area B. Which of the following reasons and processing methods are correct? (Multiple choice)
A . There is no neighbor relationship configured with B
B . Is the other party the same frequency or different frequency; if the same frequency, the A4 related parameters may be misconfigured.
C . The neighboring area B level is also very low
D . Neighbor B has hardware failure or power failure

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Answer: ACD