[-16.6] [-18] [-10] TDD [-22] [-12] TDD [-24] [-28] Time [s] UE may turn power on UE shuts power off Figure 5.2 UE out-of-synch handling. Qout and Qin thresholds are for reference only [1]. Figure 5.2 illustrates the DPCH power level and the shutting off and on, where the re- quirements for the UE from Refs. [1,2] are that: The UTRA Transmission System The UE shall not shut its transmitter off before point B. The UE shall shut its transmitter off before point C, which is Toff = [200] ms after point B. The UE shall not turn its transmitter on between points C and E. The UE may turn its transmitter on after point E. 5.3.5 Transmit ON/OFF Power Transmit OFF power state occurs when the UE does not transmit, except during UL DTX mode (see Figure 5.3). We define this parameter as the maximum output transmit power within the channel bandwidth when the transmitter is OFF. The requirement for transmit OFF power shall be better than -56 dBm for FDD and -65 dBm for TDD, de- fined as an averaged power within at least one time slot duration measured with a RRC filter response having a roll off factor a = 0.22 and a bandwidth equal to the chip rate. Up-Link DPDCH Up-Link DPCCH Average ON Power Average ON Power 50 us Minimum -50 dBm Power 50 us OFF Power 50 chips Transmission period OFF Power 96 chips 96chips Figure 5.3 Transmit ON/OFF template. The time mask for transmit ON/OFF defines the UE ramping time allowed between transmit OFF power and transmit ON power. This scenario may include the RACH, CPCH or UL slotted mode. We define ON power as one of the following cases [1]: first preamble of RACH: open loop accuracy; during preamble ramping of the RACH and compressed mode: accuracy depending on size of the power step; power step to maximum power: maximum power accuracy. Specifications in Ref. [1] describes power control events in Transport Format Combina- tion (TFC) and compressed modes. The UMTS Network and Radio Access Technology 5.3.5.1 BS Transmit OFF Power (TDD) When the BS does not transmit, it remains in transmit off p