SDCCH HO : it occurs during a SDCCH communication (or SDCCH phase). When the BSC detects a HO (PBGT or EMERGENCY), it triggers a HO to establish a SDCCH on a neighbor cell.
DIRECTED RETRY : the SDCCH phase has ended and the call is in the Queue. If while in the queue, a HO is detected, the TCH ill be establish in a neighbor cell.
FORCED DIRECTED RETRY : While in the queue, if RXLEV “capture” conditions are met on a neighbor cell, the TCH qill be establish on the neighbor cell.