PBGT switching needs to meet the following conditions: (Multiple choice)
A . The receiving level and related parameters of the serving cell and the target cell satisfy the trigger condition (PBGT value and P/N criterion);
B . The serving cell and the target cell must be in the same BSC;
C . The target cell and the serving cell are at the same level;
D . The target cell is sorted in the post-selection queue in front of the serving cell.
Answer: A C D