Fixed Timers

7/28/2019 Fixed Timers

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Timer NameDescription Value

T100 RADIO-LINK-TIMEOUT

Detects the presence of the radio link by detectingSACCH frames every 480 ms.

4 SACCH

multiframes. That

is 1.92 seconds ifthe SACCH is

completely absent.

T200 Data link

timer

Used for re-transmission on the data link. The

value varies depending on the message type.155 ms for FACCH

T301 Alerting

(ringing) timer

Timer used to limit the amount of time a user has

to answer a call.20 seconds

T303 Mobility

Management

connection timer

Time the network waits after sending a CMSERVICE REQUEST until receiving a response.

This occurs before initiating call clearing

procedures towards the MS.

10 seconds

T305 Release

timer

Time the network waits after transmitting a

DISCONNECT message until receiving a

RELEASE message.10 seconds

T306 In-band

tones release timer

Time the network waits after transmitting a

DISCONNECT message while in-bandtones/announcements are provided, until receiving

a RELEASE message.

10 seconds

T308 Releasetimer

Time the network waits after sending a RELEASE

message until receiving a RELEASE COMPLETE

message. This occurs before re-transmitting theRELEASE or releasing the Mobility Management

connection.

10 seconds

T310 Call

proceeding timer

Time the network waits after receiving a CALL

CONFIRMED message until receiving a

ALERTING, CONNECT, or DISCONNECTmessage before initiating clearing procedurestowards the MS.

10 seconds

T313 Connect

acknowledge timer

Time the network waits after transmitting aCONNECT message until receiving the

CONNECT ACKNOWLEDGE message before

performing clearing procedures with the MS.

10 seconds


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T323 Modify

complete timer

Time the network waits after sending a MODIFY

message during call mode changes, until receiving

a MODIFY COMPLETE or MODIFY REJECTmessage before initiating call clearing procedures.

10 seconds

T3101 Immediate

assignment timer

Time the network waits after sending theIMMEDIATE ASSIGNMENT or IMMEDIATE

ASSIGNMENT EXTENDED message until the

main signalling link is established before releasingthe newly allocated channels.

1 second

T3103 Handover

timer

Time the network waits after transmitting aHANDOVER COMMAND message until

receiving HANDOVER COMPLETE orHANDOVER FAILURE or the MS re-establishesthe call before the old channels are released. If the

timer expires and the network has not received a

correctly decoded L2 (format A or B) or TCHframe, then the newly allocated channels are

released.

2 seconds

T3105 Physicalinformation

repetition timer

Time the network waits after sending the

PHYSICAL INFORMATION message until

receiving a correctly decoded L2 (format A or B)

or TCH frame. This occur before re-transmitting

the PHYSICAL INFORMATION message orreleasing the newly allocated channels.

50 ms

T3107 Channel

assignment timer

Time the network waits after transmitting an

ASSIGNMENT COMMAND message untilreceiving the ASSESSMENT FAILURE message

or the MS re-establishes the call before releasing

the old and the new channels.

3 seconds

T3109 Signalling

disconnection

timer

Time the network waits after sending the

CHANNEL RELEASE message before

disconnecting the signalling link.

5 seconds

T3111 Channel

deactivation afterdisconnection

timer

Time the network waits after disconnecting thesignalling link before deactivating the channel.

500 ms


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T3113 Pagingtimer

Time the network waits after transmitting the

PAGING REQUEST message until receiving the

PAGING RESPONSE message. This occursbefore re-transmitting the PAGING REQUEST (if

the maximum number of re-transmissions have not

been exceeded).

5 seconds

T3212 Locationupdate timer

The location update timer is set to zero, periodic

location update by the MS are disabled. If the MScamps to the BCH and decodes a new MCC or

MNC from the one it last camped on, it should

perform a location update.

zero = infinite time

T3250 TMSIreallocation timer

Time the network waits after sending the TMSI

REALLOCATION COMMAND until receiving

TMSI REALLOCATION COMPLETE. Thisoccurs before aborting the procedure and releasing

the Radio Resource connection.

5 seconds

T3260

Authenticationresponse timer

Time the network waits after an

AUTHENTICATION REQUEST until receiving

AUTHENTICATION RESPONSE. This occursbefore aborting the procedure and releasing the

Radio Resource connection.

5 seconds

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Fixed Timers