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Timer (RRC)
Following table is from 36.331 7.3 Timers (Informative)
Timer
T300
T301
T302
T303
T304
T305
T310
T311
T320
T321
Start
Stop
At expiry
Transmission of RRCConnectionRequest Reception of RRCConnectionSetup or Perform the actions
RRCConnectionReject message, cell as specified in
re-selection and upon abortion of
5.3.3.6
connection establishment by upper
layers
Transmission of
Reception of
Go to RRC_IDLE
RRCConnectionReestabilshmentRequest RRCConnectionReestablishment or
RRCConnectionReestablishmentReject
message as well as when the
selected cell becomes unsuitable
Reception of RRCConnectionReject
Upon entering RRC_CONNECTED and Inform upper layers
while performing RRC connection
upon cell re-selection
about barring
establishment
alleviation as
specified in 5.3.3.7
Access barred while performing RRC
Upon entering RRC_CONNECTED and Inform upper layers
connection establishment for mobile
upon cell re-selection
about barring
originating calls
alleviation as
specified in 5.3.3.7
Reception of
Criterion for successful completion of In case of cell
RRCConnectionReconfiguration
handover to EUTRA or cell change
change order from
message including the MobilityControl order is met (the criterion is specified E-UTRA or intra
Info or reception of
in the target RAT in case of interE-UTRA handover,
MobilityFromEUTRACommand message RAT)
initiate the
including CellChangeOrder
RRCconnection reestablishment
procedure; In case
of handover to
E-UTRA, perform the
actions defined in
the specifications
applicable for the
source RAT.
Access barred while performing
Upon entering RRC_CONNECTED and Inform upper layers
RRCconnection establishment for
upon cell re-selection
about barring
mobile originating signalling
alleviation as
specified in 5.3.3.7
Upon detecting physical layer problems Upon receiving N311 consecutive in- If security is not
i.e. upon receiving N310 consecutive
sync indications from lower layers,
activated: go to
out-of-sync indications from lower
upon triggering the handover
RRC_IDLE
layers
procedure and upon initiating the
connection re-establishment
else: initiate the
procedure
connection reestablishment
procedure
Upon initiating the RRCconnection
Selection of a suitable E-UTRA cell or Enter RRC_IDLE
reestablishmentmprocedure
a cell using another RAT.
Upon receiving t320 or upon cell
Upon entering RRC_CONNECTED,
Discard the cell
(re)selection to E-UTRA from another when PLMN selection is performed on reselection priority
RAT with validity time configured for
request by NAS, or upon cell
information provided
dedicated priorities (in which case the (re)selection to another RAT (in
by dedicated
remaining validity time is applied).
which case the timer is carried on to signalling.
the other RAT).
Upon receiving measConfig including a Upon acquiring the information
Initiate the
reportConfig with the purpose set to
needed to set all fields of cellGlobalId measurement
reportCGI
for the requested cell, upon receiving reporting procedure,
measConfig that includes removal of stop performing the
the reportConfig with the purpose set related
to reportCGI
measurements and
remove the
corresponding
measId
23-06-2021, 23:41