GSM Timers Mobile Side
This page covers timers used in GSM on mobile side which include T3110, T3112, T3114, T3122, T3128, T3130, T3142, T3148, T3164, T3204, T3206, T3208, T3210, T3220, T3222, T3224 and T3232.
| Timer | Function/value |
|---|---|
| T3110 | This timer is used to delay the channel de-activation after the receipt channel release message.
It allows time for complete dis-connection of the signaling link. The value of this timer is set such that two times DISC frame can be transmitted when mobile does not receive any answer from the network side. |
| T3112 | The timer is used by a VGCS mobile when receiving segmented RP-Data message on the SACCH. The timer is started when receiving the first segment of a segmented RP-Data message for a group call that the MS is a member of, for which no previous segment has been received. It is stopped in the following situations: -The MS receives the complete RP-Data message -The MS discards the message as a result of timer T3114 expiring for some other message -The MS deletes the segment(s) (with SMS reference number n) because it has received a segment with a SMS reference number which is more than 4 higher (modulo 16) than that of the message corresponding to this timer -The MS changes its channel -The voice group call is cleared. The value of the timer is 20 seconds. |
| T3114 | The timer is used by a VGCS mobile when receiving a complete RP-Data message on the SACCH
that is not the next in sequence message that is to be sent to the upper layer. It is stopped in the following situations: -The MS delivers the RP-Data message to the upper layer -The MS changes its channel -The voice group call is cleared. The value of the timer is 10 seconds. |
| T3122 | This timer is used during random access or during dedicated channel assignment while in packet
transfer mode, after the receipt of immediate assign reject. Its value is given by the network and conveyed in above message. |
| T3128 |
This timer is started when the mobile station starts the uplink(UL) investigation procedure when UL
is busy. It stops at the receipt of first UL free message. When it expires, UL investigation procedure is aborted. This timer value is about 1 second. |
| T3130 | This timer is started after sending the first UPLINK ACCESS message during a VGCS uplink
access procedure, or sending the first PRIORITY UPLINK REQUEST message during a VGCS
priority uplink request procedure. It is stopped at receipt of a VGCS UPLINK GRANT message. It may be started a maximum of 3 times. On expiry of timer T3130 for the third time a rejection of the uplink request is indicated to the upper layers. The value of this timer is set to 5 seconds. |
| T3142 | The timer is used during packet access on CCCH and during packet access while in
dedicated mode. It is started after the receipt of an IMMEDIATE ASSIGNMENT REJECT or a DTM REJECT message. The timer value is provided by network either in immediate assign reject or using DTM reject message. |
| T3148 | This timer is used during DTM establishment in dedicated mode. It is started after sending a DTM REQUEST message during a packet access procedure while in dedicated mode. It is stopped at the receipt of one of the following messages: -DTM ASSIGNMENT COMMAND; PACKET ASSIGNMENT; -DTM REJECT; -ASSIGNMENT COMMAND; -HANDOVER COMMAND. The packet access procedure is aborted when it expires. The timer value is 4 sec. |
| T3164 | Used for packet access procedure using CCCH.
It starts when mobile receives immediate assignment message. It stops when RLC/MAC block is transmitted on assigned TBF. when it expires, the mobile station returns to IDLE mode. The timer value is 5 sec. |
| T3204 | This timer is used by a mobile station with non-GSM capabilities. The timer is started after
sending the first CHANNEL REQUEST during a packet access procedure. The CHANNEL
REQUEST was sent requesting a single block packet access and the purpose of the packet access
procedure is to send a PACKET PAUSE message. It is stopped at the receipt of an IMMEDIATE ASSIGNMENT message granting a single block period on an assigned packet uplink resource. The packet access procedure is aborted when the timer expires. Value-1 second. |
| T3206 | The timer is used by a VGCS mobile when receiving segmented notifications on the NCH. The
timer is started when receiving a segment of a segmented notification for a group call that the MS
is a member for which no previous segment has been received. It is stopped in the following situations: - The MS receives the second segment - The MS joins another call - The value of NLN changes - The MS reselects to another cell. The value of the timer is 5 second. |
| T3208 | The timer is used by a VGCS mobile when receiving segmented notifications on the FACCH. The
timer is started when receiving the first segment of a segmented notification for a group call that
the MS is a member for which no previous segment has been received. It is stopped in the following situations: - The MS receives the complete message - The MS joins another call - The MS performs Handover to another cell The value of the timer is 1 second. |
| T3210 | The timer is used by a VGCS mobile when receiving segmented notifications on the PCH. The timer is started when receiving the first segment of a segmented notification for a group call that the MS is a member for which no previous segment has been received. It is stopped in the following situations: - The MS receives the complete message - The MS leaves Idle mode - Notifications for another group call are received on the PCH The value of the timer is 5 seconds. |
| T3220 | The timer is used by an MBMS capable mobile station when receiving pre-notification of an
MBMS session. The timer is started when receiving a PAGING REQUEST message containing an MBMS pre-notification that the mobile station shall receive. It is stopped at the receipt of a PAGING REQUEST message containing a notification of the same session as when starting this timer, or if any other RR procedure on CCCH not related to MBMS is triggered or a notification is received for a higher priority session while the timer is running. At expiry, the mobile station returns to DRX mode unless it is engaged in any other MBMS session and then stays in broadcast/multicast receive mode. The value of the timer is 46 s. |
| T3222 | An instance of the timer may be used by an MBMS capable mobile station in dedicated mode
during the notification of MBMS. An instance of this timer may be started at the receipt of an
MBMS ANNOUNCEMENT message when in dedicated mode. The instance of this timer is stopped when the mobile enters packet idle mode. At expiry of an instance of this timer, the mobile station discards the MBMS related information stored upon receipt of the corresponding MBMS ANNOUNCEMENT message. |
| T3224 | The timer start at on receipt of a VGCS_UPLINK_GRANT message aimed to another mobile
station. It is stopped when the mobile station received an UPLINK BUSY message. At expiry, the mobile station shall follow the same procedures as for expiry of timer T3130. The value of the timer is 1 s. |
| T3232 | The timer is used to control the length of the non-DRX mode period in which the mobile station is
acquiring an ETWS Primary Notification message. It is started on receipt of a first PAGING REQUEST TYPE 1 message containing a valid segment of an ETWS Primary Notification message. It is stopped in the following situations: - The mobile station receives the complete ETWS Primary Notification message - Upon initiating cell reselection or connection establishment procedures The timer is restarted if the mobile station receives an indication of a new ETWS Primary Notification message prior to acquiring a complete ETWS Primary Notification message. At expiry the mobile station shall discard all segments of the partially received ETWS Primary Notification message and re-enter DRX mode. Timer value-5 seconds. |
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