8.5.4 Physical channel establishment criteria in CELL_DCH state

25.3313GPPProtocol specificationRadio Resource Control (RRC)Release 17TS

When a physical dedicated channel establishment on the downlink frequency associated with the primary uplink frequency is initiated by the UE, the UE shall start a timer T312 and wait for layer 1 to indicate N312 "in sync" indications. On receiving N312 "in sync" indications on the downlink frequency associated with the primary uplink frequency, the physical channel is considered established on the downlink frequency associated with the primary uplink frequency and the timer T312 is stopped and reset.

For 1.28Mcps TDD, when physical dedicated channel(s) are not configured, if a physical shared channel establishment is initiated by the UE, the UE shall start a timer T312 and wait for layer 1 to indicate N312 "in sync" indications. On receiving N312 "in sync" indications, the physical channel is considered established and the timer T312 is stopped and reset.

If the timer T312 expires before the physical channel is established on the downlink frequency associated with the primary uplink frequency, the UE shall consider this as a "physical channel failure".

NOTE: The criteria defined in this subclause only apply in case the UE performs synchronisation procedure A (FDD only).

NOTE: The physical shared channel defined in this subclause are HS-PDSCH, HS-SCCH or E-AGCH. (1.28 Mcps TDD only).