Timers in LTE

LTE UE Timers:

TimerStartStopAt expiry
T300Transmission of RRCConnectionRequest Reception of RRCConnectionSetup or RRCConnectionReject message, cell re-selection and upon abortion of connection establishment by upper layersReset MAC and Mac configuration. Inform upper layers about the failure 
T301Transmission of RRCConnectionReestabilshmentRequestReception of RRCConnectionReestablishment or RRCConnectionReestablishmentReject message as well as when the selected cell becomes unsuitableGo to RRC_IDLE
T302Reception of RRCConnectionReject while performing RRC connection establishmentUpon entering RRC_CONNECTED and upon cell re-selectionInform upper layers
T303Access barred while performing RRC connection establishment for mobile originating callsUpon entering RRC_CONNECTED and upon cell re-selectionInform upper layers 
T304Reception of RRCConnectionReconfiguration message including the MobilityControl Info orCriterion for successful completion of handover to EUTRA or cell change order is met (the criterion is specified in the target RAT in case of inter-RAT)In case of cell change order from E-UTRA or intra E-UTRA handover, initiate the RRC connection re-establishment procedure; In case of handover to E-UTRA, perform the actions defined in the specifications applicable for the source RAT.
reception of MobilityFromEUTRACommand message including CellChangeOrder
T305Access barred while performing RRC connection establishment for mobile originating signallingUpon entering RRC_CONNECTED and upon cell re-selection Inform upper layers 
T310Upon detecting physical layer problems i.e. upon receiving N310 consecutive out-of-sync indications from lower layersUpon receiving N311 consecutive in-sync indications from lower layers, upon triggering the handover procedure and upon initiating the connection re-establishment procedureIf security is not activated: go to RRC_IDLE else: initiate the connection re-establishment procedure 
T311Upon initiating the RRC connection re-establishment procedureSelection of a suitable E-UTRA cell or a cell using another RAT.Enter RRC_IDLE
T320Upon receiving t320 or upon cell (re)selection to E-UTRA from another RAT with validity time configured for dedicated priorities (in which case the remaining validity time is applied).Upon entering RRC_CONNECTED, when PLMN selection is performed on request by NAS, or upon cell (re)selection to another RAT (in which case the timer is carried on to the other RAT).Discard the cell reselection priority information provided by dedicated signalling.
T321Upon receiving measConfig including a reportConfig with the purpose set to reportCGIUpon acquiring the information needed to set all fields of cellGlobalId for the requested cell, upon receiving measConfig that includes removal of the reportConfig with the purpose set to reportCGIInitiate the measurement reporting procedure, stop performing the related measurements and remove the corresponding measId


LTE UE Constants:

Constant
Usage
N310
Maximum number of consecutive "out-of-sync" indications received from lower layers. Value in whole number
N311
Maximum number of consecutive "in-sync" indications received from lower layers. Value in whole number


Taken from 3GPP TS 36.331

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