T300:
Start: Transmission of RRCConnectionRequest
Stop: Reception of RRCConnectionSetup or RRCConnectionReject message, cell re-selection and upon abortion of connection establishment by upper layers
Expiry: Reset MAC and Mac configuration. Inform upper layers about the failure
T301:
Start: Transmission of RRCConnectionReestabilshmentRequest
Stop: Reception of RRCConnectionReestablishment or RRCConnectionReestablishmentReject message as well as when the selected cell becomes unsuitable
Expiry: Go to RRC_IDLE
T302:
Start: Reception of RRCConnectionReject while performing RRC connection establishment
Stop: Upon entering RRC_CONNECTED and upon cell re-selection
Expiry: Inform upper layers about barring alleviation as specified in 5.3.3.7
T303:
Start: Access barred while performing RRC connection establishment for mobile originating calls
Stop: Upon entering RRC_CONNECTED and upon cell re-selection
Expiry: Inform upper layers
T304:
Start: reception of MobilityFromEUTRACommand message including CellChangeOrder
Stop: Reception of RRCConnectionReconfiguration message including the MobilityControl Info or Criterion 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)
Expiry: 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.
T305:
Start: Access barred while performing RRC connection establishment for mobile originating signalling
Stop: Upon entering RRC_CONNECTED and upon cell re-selection
Expiry: Inform upper layers
T310
Start: Upon detecting physical layer problems i.e. upon receiving N310 consecutive out-of-sync indications from lower layers
Stop: Upon receiving N311 consecutive in-sync indications from lower layers, upon triggering the handover procedure and upon initiating the connection re-establishment procedure
Expiry: If security is not activated: go to RRC_IDLE else: initiate the connection re-establishment procedure
T311
Start: Upon initiating the RRC connection re-establishment procedure
Stop: Selection of a suitable E-UTRA cell or a cell using another RAT.
Expiry: Enter RRC_IDLE
T320
Start: Upon 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).
Stop: 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).
Expiry: Discard the cell reselection priority information provided by dedicated signalling.
T321
Start: Upon receiving measConfig including a reportConfig with the purpose set to reportCGI
Stop: Upon 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 reportCGI
Expiry: Initiate the measurement reporting procedure, stop performing the related measurements and remove the corresponding measId
RRC Constants:
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
For more details refer TS 36.331 7.3 Timers