de B. An intrafrequency hard handover is also possible in the case where an SHO is not possible. Usually an intrafrequency handover is used as the 'last chance' in the case where an SHO is not possible. If neither an SHO nor an intrasystem hard handover is possible, but there are measurement reports confirming that a neighbour cell Ec/10 is stronger than a serving cell, a forced RRC connection release takes place. In the case of a lack of WCDMA coverage, poor Ec/10, quality deterioration reports from the outer loop power control function or high transmit power from either the UE or WBTS, interfrequency or intersystem handover is triggered. The interfrequency and intersystem handovers require measurements on another frequency band. If the UE is not designed with a dual receiver the needed performing measurements require compressed mode. In compressed mode the continuous transmission of the WCDMA is interrupted and transmission gaps are used to perform measurements on another frequency band. If a neighbouring cell is found and decision criteria are fulfilled the interfrequency or intersystem handover is performed. Also FDD (frequency division duplex)/TDD (time division duplex), TDD/FDD and TDD/TDD are specified (TR 25.922), but as they are not implemented in existing networks they are not covered in this chapter. Different Types of WCDMA Handovers FDD soft/softer handover (intrasystem intrafrequency HO) FDD interfrequency (intrasystem interfrequency HO) FDD/TDD handover (intersystem HO) TDD/FDD handover TDD/TDD handover Handover WCDMA-GSM (intersystem HO) Handover GSM-WCDMA (intersystem HO) A specific (soft) handover situation is a crossing of an RNC border, when serving RNC resources need to be relocated. Soft Handover Soft handover (SHO) is a situation where the UE is connected to two or more sectors simultaneously. A definition to separate soft handover from softer handover can be that soft handover is a situation where the UE is simultaneously connected to two or more sectors from different NodeBs. The NodeBs p