Timer
|
Start
|
Stop
|
At Expiry
|
Recommended Value
|
T300
|
This timer is started when the UE sends
RRCConnectionRequest.
|
Reception of RRCConnectionSetup or
RRCConnectionReject
message, cell re-selection and upon
abortion of connection
establishment by
upper layers
|
the UE directly
enters the RRC_IDLE state
|
200ms
|
T301
|
This timer is started when the UE sends
an RRC Connection Reestablishment Request message
|
The timer is stopped if the UE receives
an RRC Connection
Reestablishment or RRC Connection
Reestablishment Reject message. The timer is also stopped if the selected
cell becomes an unsuitable cell.
|
the UE enters the
RRC_IDLE mode.
|
200ms
|
T302
|
Reception of RRCConnectionReject while
performing RRC connection establishment
|
This timer is stopped when the UE
enters the RRC_CONNECTED
mode or performs
cell reselection
|
Informs upper
Layers
|
4s
|
T303
|
Starts when access is barred while
performing RRC CONNECTION ESTABLISHMENT for MO(Mobile Originating) calls
|
Upon entering
RRC_CONNECTED and upon cell re-selection
|
Informs upper
Layers
|
|
T304
|
Starts at the Receipt of RRC CONNECTION
RECONFIGURATION message along with
Mobility Control Info OR at the receipt of mobility from EUTRA command
message including
CELL CHANGE ORDER
|
Criterion for successful completion of
handover to EUTRA or cell Change order is met (the criterion is specifiedin
the target RAT incase of inter-RAT)
|
In case of cell change order from
E-UTRA or intra
E-UTRA handover,initiate
theRRCconnectionreestablishment
procedure; Incase of handover toEUTRA,
perform the actions defined in
thespecificationsapplicable
forthe source RAT
|
For EUTRAN: 500ms for
GERAN: 8000ms
|
T305
|
Access barred while performing
RRCconnectionestablishment for mobile originating signalling
|
Upon entering
RRC_CONNECTEDand upon cell re-selection
|
Informs upper
Layers
|
|
T310
|
Upon detecting physical layer
problemsi.e. upon receiving
N310
consecutiveout-of-sync indications from lowerlayers
|
Upon receiving N311 consecutive in-sync
indications from lower
layers,upon triggering the handover procedure
and upon initiating
the connection
re-establishment procedure
|
the UE enters the RRC_IDLE mode if the
security
mode is not activated. If the security
mode is
activated, the UE initiates an RRC
connection
reestablishment
procedure.
|
1000ms
|
T311
|
Upon initiating the RRC connection
re-establishment
procedure
|
the UE selects an
E-UTRAN or inter-RAT cell to camp on.
|
the UE enters the
RRC_IDLE mode
|
1000ms
|
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 signaling
|
|
T321
|
starts upon receipt of measConfig
including a
reportConfig with the purpose set to
reportCGI
|
Stops at either of following cases:
1. Upon acquiring the information
needed to set all fields of
Global CellId for the requested cell
2. upon receipt of measConfig that
includes removal of the
reportConfig with the purpose set to
reportCGI
|
At expiry initiates the measurement
reporting
procedure, stop performing the related
measurements and remove the
corresponding
measID
|
|
Tuesday, 22 July 2014
LTE Timers
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