UL to OL ? what does it mean ?
HO from outer zone to inner zone can fail because :
– your settings are wrong (what are your settings ?)
– the inner zone is “congested” (ho failure due to congestion)
– cross sector : the inner zone is actually located in another sector 🙂
– hardware problems : the Rx or Tx path in the BTS is faulty on the inner zone TRX.