LTE RRC Timers

Timer

Start

Stop

At expiry

T300

NOTE1

Transmission of RRCConnectionRequest or RRCConnectionResumeRequest

Reception of RRCConnectionSetup, RRCConnectionReject or RRCConnectionResume message, cell re-selection and upon abortion of connection establishment by upper layers

Perform the actions as specified in 5.3.3.6

T301

NOTE1

Transmission of RRCConnectionReestabilshmentRequest

Reception of RRCConnectionReestablishment or RRCConnectionReestablishmentReject message as well as when the selected cell becomes unsuitable

Go to RRC_IDLE

T302

Reception of RRCConnectionReject while performing RRC connection establishment

Upon entering RRC_CONNECTED and upon cell re-selection

Inform upper layers about barring alleviation as specified in 5.3.3.7

T303

Access barred while performing RRC connection establishment for mobile originating calls

Upon entering RRC_CONNECTED and upon cell re-selection

Inform upper layers about barring alleviation as specified in 5.3.3.7

T304

Reception of RRCConnectionReconfiguration message including the MobilityControl Info or

reception of MobilityFromEUTRACommand message including CellChangeOrder

Criterion for successful completion of handover within E-UTRA, handover to E-UTRA 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.

T305

Access barred while performing RRC connection establishment for mobile originating signalling

Upon entering RRC_CONNECTED and upon cell re-selection

Inform upper layers about barring alleviation as specified in 5.3.3.7

T306

Access barred while performing RRC connection establishment for mobile originating CS fallback.

Upon entering RRC_CONNECTED and upon cell re-selection

Inform upper layers about barring alleviation as specified in 5.3.3.7

T307

Reception of RRCConnectionReconfiguration message including MobilityControlInfoSCG

Successful completion of random access on the PSCell, upon initiating re-establishment and upon SCG release

Inform E-UTRAN about the SCG change failure by initiating the SCG failure information procedure as specified in 5.6.13.

T308

Access barred due to ACDC while performing RRC connection establishment subject to ACDC

Upon entering RRC_CONNECTED and upon cell re-selection

Inform upper layers about barring alleviation for ACDC as specified in 5.3.3.7

T310

NOTE1

NOTE2

Upon detecting physical layer problems for the PCell i.e. upon receiving N310 consecutive out-of-sync indications from lower layers

Upon receiving N311 consecutive in-sync indications from lower layers for the PCell, upon triggering the handover procedure and upon initiating the connection re-establishment procedure

If security is not activated: go to RRC_IDLE else: initiate the connection re-establishment procedure

T311

NOTE1

Upon initiating the RRC connection re-establishment procedure

Selection of a suitable E-UTRA cell or a cell using another RAT.

Enter RRC_IDLE

T312

NOTE2

Upon triggering a measurement report for a measurement identity for which T312 has been configured, while T310 is running

Upon receiving N311 consecutive in-sync indications from lower layers, upon triggering the handover procedure, upon initiating the connection re-establishment procedure, and upon the expiry of T310

If security is not activated: go to RRC_IDLE else: initiate the connection re-establishment procedure

T313

NOTE2

Upon detecting physical layer problems for the PSCell i.e. upon receiving N313 consecutive out-of-sync indications from lower layers

Upon receiving N314 consecutive in-sync indications from lower layers for the PSCell, upon initiating the connection re-establishment procedure, upon SCG release and upon receiving RRCConnectionReconfiguration including MobilityControlInfoSCG

Inform E-UTRAN about the SCG radio link failure by initiating the SCG failure information procedure as specified in 5.6.13.

T320

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).

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.

T321

Upon receiving measConfig including a reportConfig with the purpose set to reportCGI

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

Initiate the measurement reporting procedure, stop performing the related measurements and remove the corresponding measId

T322

Upon receiving redirectedCarrierOffsetDedicated included in RedirectedCarrierInfo

Upon entering RRC_CONNECTED, when PLMN selection is performed on request by NAS, or upon cell (re)selection to another RAT.

Release redirectedCarrierOffsetDedicated.

T325

Timer (re)started upon receiving RRCConnectionReject message with deprioritisationTimer.

 

Stop deprioritisation of all frequencies or E-UTRA signalled by RRCConnectionReject.

T330

Upon receiving LoggedMeasurementConfiguration message

Upon log volume exceeding the suitable UE memory, upon initiating the release of LoggedMeasurementConfiguration procedure

Perform the actions specified in 5.6.6.4

T340

NOTE2

Upon transmitting UEAssistanceInformation message with powerPrefIndication set to normal

Upon initiating the connection re-establishment procedure

No action.

T341

NOTE2

Upon transmitting UEAssistanceInformation message with bw-Preference.

Upon resuming an RRC connection or upon initiating the connection re-establishment procedure

No action.

T342

NOTE2

Upon transmitting DelayBudgetReport message.

Upon initiating the connection re-establishment and connection resume procedures

No action.

T350

Upon entering RRC_IDLE if t350 has been received in wlan-OffloadInfo.

Upon entering RRC_CONNECTED, or upon cell reselection.

Perform the actions specified in 5.6.12.4.

T351

Reception of RRCConnectionReconfiguration message including the associationTimer in WLAN-MobilityConfig.

Upon successful connection to WLAN, upon WLAN connection failure, upon leaving RRC_CONNECTED, upon triggering the handover procedure, or upon initiating the connection re-establishment procedure.

Perform WLAN Connection Status Reporting specified in 5.6.15.2.

T360

Upon performing the redistribution target selection as specified in TS 36.304 [4].

Upon entering RRC_CONNECTED, upon receiving a Paging message including redistributionIndication; upon reselecting a cell not belonging to the redistribution target.

Stop considering a frequency or cell to be redistribution target, and perform the redistribution target selection if the condition specified in TS 36.304 [4] is met.

T370

Upon receiving SL-DiscConfig including a discSysInfoToReportConfig set to setup.

Upon initiating the transmission of SidelinkUEInformation including discSysInfoReportFreqList, upon receiving SL-DiscConfig including discSysInfoToReportConfig set to release, upon handover and re-establishment.

Release discSysInfoToReportConfig.

T314

NOTE2

Upon early detecting physical layer problems for the PCell i.e. upon receiving N310 consecutive "early-out-of-sync" indications from lower layers.

Upon receiving N311 consecutive in-sync indications from lower layers for the PCell, upon triggering the handover procedure and upon initiating the connection re-establishment procedure

Initiate the UE Assistance Information procedure to report early detection of physical layer problems in accordance with 5.6.10.

T315

NOTE2

Upon detecting physical layer improvements of the PCell i.e. upon receiving N311 consecutive "early-in-sync" indications from lower layers.

Upon receiving N310 consecutive "early-out-of-sync" indications from lower layers for the PCell.

Initiate the UE Assistance Information procedure to report detection of physical layer improvements in accordance with 5.6.10.

T343

NOTE2

Upon transmitting UEAssistanceInformation message with RLM-Report including earlyOutOfSync.

Upon initiating the connection re-establishment procedure

No action.

T344

NOTE2

Upon transmitting UEAssistanceInformation message with RLM-Report including earlyInSync.

Upon initiating the connection re-establishment procedure

No action.

NOTE1: Only the timers marked with "NOTE1" are applicable to NB-IoT.

NOTE2: The behaviour as specified in 7.3.2 applies.

 

 

Constant

Usage

N310

Maximum number of consecutive "out-of-sync" or "early-out-of-sync" indications for the PCell received from lower layers

N311

Maximum number of consecutive "in-sync" or "early-in-sync" indications for the PCell received from lower layers

N313

Maximum number of consecutive "out-of-sync" indications for the PSCell received from lower layers

N314

Maximum number of consecutive "in-sync" indications for the PSCell received from lower layers

 

Source: 3GPP 36.331, for latest update please visit 3GPP official file location 

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