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UE Side Timers in LTE

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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

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

T306
Start : Access barred while performing RRC connection establishment for mobile originating CS fallback. Stop: Upon entering RRC_CONNECTED and upon cell re-selection
Expiry: Inform upper layers about barring alleviation

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

T325
Start: Timer (re)started upon receiving RRCConnectionReject message with deprioritisationTimer.
Expiry: Stop deprioritisation of all frequencies or E-UTRA signalled by RRCConnectionReject.

T330
Start: Upon receiving LoggedMeasurementConfiguration message
Stop: Upon log volume exceeding the suitable UE memory, upon initiating the release of LoggedMeasurementConfiguration procedure
Expiry: release VarLogMeasConfig

T340
Start: Upon transmitting UEAssistanceInformation message with powerPrefIndication set to normal
Stop: Upon initiating the connection re-establishment procedure
Expiry: No action.

References

3GPP TS 36.331
posted Jan 15, 2014 by Sheetal Chauhan

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