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GSM Timers Timer Name
Description
Value
T100 RADIO-LINK- Detects the presence of the radio link by detecting SACCH TIMEOUT frames every 480 ms.
4 SACCH multiframes. That is 1.92 seconds if the 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 CM SERVICE REQUEST until receiving receiving a response. This occurs before initiating call clearing procedures towards the MS.
10 seconds
Time the network waits after transmitting a DISCONNECT T305 Release timer message until receiving a RELEASE message.
10 seconds
Time the network waits after transmitting a DISCONNECT T306 In-band tones message while in-band tones/announcements are provided, until 10 seconds release timer receiving a RELEASE message. Time the network waits after sending a RELEASE message until receiving a RELEASE COMPLETE message. This occurs before T308 Release timer 10 seconds re-transmitting re-transmitting the RELEASE or releasing the Mobility Management connection. T310 Call proceeding timer
Time the network waits after receiving a CALL CONFIRMED CONFIRMED message until receiving a ALERTING, ALERTING, CONNECT, or DISCONNECT DISCONNECT message before initiating clearing p rocedures towards the MS.
10 seconds
Time the network waits after transmitting a CONNECT message T313 Connect until receiving the CONNECT ACKNOWLEDGE ACKNOWLEDGE message before 10 seconds acknowledge timer performing clearing procedures with the MS. T323 Modify complete timer
Time the network waits after sending a MODIFY message during call mode changes, until receiving a MODIFY COMPLETE COMPLETE or 10 seconds MODIFY REJECT message before initiating call clearing procedures.
Time the network waits after sending the IMMEDIATE IMMEDIATE T3101 Immediate ASSIGNMENT ASSIGNMENT or IMMEDIATE IMMEDIATE ASSIGNME ASSIGNMENT NT EXTENDED EXTENDED assignment timer message until the main signalling link is established before releasing the newly allocated channels.
1 second
T3103 Handover timer
Time the network waits after transmitting a HANDOVER COMMAND message until receiving HANDOVER COMPLETE or HANDOVER FAILURE or the MS re-establishes the call 2 seconds 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 TCH frame, then the newly allocated channels are released.
T3105 Physical information repetition timer
Time the network waits after sending the PHYSICAL PHYSICAL INFORMATION INFORMATION message until receiving a correctly decoded L 2 (format A or B) or TCH frame. This occur before re-transmitting 50 ms the PHYSICAL INFORMATION INFORMATION message or releasing the newly allocated channels.
Timer Name
T3107 Channel assignment timer
Description
Time the network waits after transmitting an ASSIGNMENT COMMAND message until receiving the ASSESSMENT FAILURE message or the MS re-establishes the call before releasing the old and the new channels.
Value
3 seconds
T3109 Signaling Time the network waits after sending the CHANNEL RELEASE 5 seconds disconnection timer message before disconnecting the signalling link. T3111 Channel Time the network waits after disconnecting the signalling link deactivation after before deactivating the channel. disconnection timer
500 ms
Time the network waits after transmitting the PAGING REQUEST message until receiving the PAGING RESPONSE T3113 Paging timer message. This occurs before re-transmitting the PAGING REQUEST (if the maximum number of re-transmissions have not been exceeded).
5 seconds
T3212 Location update timer
The location update timer is set to zero, periodic location update by the MS are disabled. If the MS camps to the BCH and zero = infinite time decodes a new MCC or MNC from the one it last camped on, it should perform a location update.
T3250 TMSI reallocation timer
Time the network waits after sending the TMSI REALLOCATION COMMAND until receiving TMSI REALLOCATION COMPLETE. 5 seconds This occurs before aborting the procedure and releasing the Radio Resource connection.
T3260 Authentication response timer
Time the network waits after an AUTHENTICATION REQUEST until receiving AUTHENTICATION RESPONSE. This occurs 5 seconds before aborting the procedure and releasing the Radio Resource connection.
