Hi,
If Both ENBs are in sync over the GPS or any other resources then UE will successfully perform rach to the target cell using dedicated preamble received in mobility control info.
But question is maximum how many times UE will do rach to the target cell nothing but how many times UE will do preamble transmission, it depends on the IE preambleTransMax
present in RACH-ConfigCommon
as a part of MobilityControlInfo
.
So UE initially will try with preambleInitialReceivedTargetPower
if it fails to receive RAR(MSG2) then UE will try again with power = preambleInitialReceivedTargetPower
+ delta_preamble + (preamble_trans_counter - 1) * PowerRampingStep
.
where,
delta_preamble based on preamble format (0 for 0 preamble format)and
0 < preamble_trans_counter <= preambleTransMax
These all parameters will be present in RACH-ConfigCommon
in SIB2 and mobilitycontrolinfo