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neels, 09/16/2020 12:29 AM


List of Timer numbers

Below is a list of timer numbers used in Osmocom programs.
Many are specified by 3GPP specifications, indicated by a T (like T3103).
There are also various Osmocom specific timers, indicated by an X (like X23).

There are also numerous timer configurations in Osmocom predating introduction of T and X timers, not listed here.

Timers specified by 3GPP

configurable Timer Program Purpose
yes net T7 OsmoBSC inter-BSC/MSC Handover outgoing, BSSMAP HO Required to HO Command timeout
yes net T8 OsmoBSC inter-BSC/MSC Handover outgoing, BSSMAP HO Command to final Clear timeout
yes net T10 OsmoBSC RR Assignment
yes net T101 OsmoBSC inter-BSC/MSC Handover incoming, BSSMAP HO Request to HO Accept
yes net T3101 OsmoBSC RR Immediate Assignment
yes net T3103 OsmoBSC Handover
yes net T3105 OsmoBSC Physical Information
yes net T3107 OsmoBSC (unused)
yes net T3109 OsmoBSC RSL SACCH deactivation
yes net T3111 OsmoBSC Wait time before RSL RF Channel Release
yes net T3113 OsmoBSC Paging
yes net T3115 OsmoBSC (unused)
yes net T3117 OsmoBSC (unused)
yes net T3119 OsmoBSC (unused)
yes net T3122 OsmoBSC Wait time after RR Immediate Assignment Reject
yes net T3141 OsmoBSC (unused)
yes net T3212 OsmoBSC Periodic Location Update timer, sent to MS (1 = 6 minutes)
yes vlr T3212 OsmoMSC Subscriber expiration timeout
yes vlr T3250 OsmoMSC TMSI Reallocation procedure
yes vlr T3260 OsmoMSC Authentication procedure
yes vlr T3270 OsmoMSC Identification procedure
yes T3312 OsmoSGSN Periodic RA Update timer (s)
yes T3313 OsmoSGSN Waiting for paging response timer (s)
yes T3314 OsmoSGSN READY timer. Force to STANDBY on expiry timer (s)
yes T3316 OsmoSGSN AA-Ready timer (s)
yes T3322 OsmoSGSN Detach request -> accept timer (s)
yes T3350 OsmoSGSN Waiting for ATT/RAU/TMSI_COMPL timer (s)
yes T3360 OsmoSGSN Waiting for AUTH/CIPH response timer (s)
yes T3370 OsmoSGSN Waiting for IDENTITY response timer (s)
yes T3385 OsmoSGSN Wait for ACT PDP CTX REQ timer (s)
yes T3386 OsmoSGSN Wait for MODIFY PDP CTX ACK timer (s)
yes T3395 OsmoSGSN Wait for DEACT PDP CTX ACK timer (s)
yes T3397 OsmoSGSN Wait for DEACT AA PDP CTX ACK timer (s)

Timers specific to Osmocom

configurable Timer Program Purpose
yes X1 OsmoBTS Time after which osmo-bts exits if regular ramp down during shut down process does not finish (s)
yes X2 OsmoBTS Time after which osmo-bts exits if requesting transceivers to stop during shut down process does not finish (s)
yes geran X1 OsmoMSC RAN connection Complete Layer 3, Authentication and Ciphering timeout
yes geran X2 OsmoMSC RAN connection release sanity timeout
yes geran X3 OsmoMSC Timeout to find a target BSS after Handover Required
yes utran X1 OsmoMSC RAN connection Complete Layer 3, Authentication and Ciphering timeout
yes utran X2 OsmoMSC RAN connection release sanity timeout
yes utran X3 OsmoMSC Timeout to find a target BSS after Handover Required
yes sgs X1 OsmoMSC RAN connection Complete Layer 3, Authentication and Ciphering timeout
yes sgs X2 OsmoMSC RAN connection release sanity timeout
yes sgs X3 OsmoMSC Timeout to find a target BSS after Handover Required
yes mgw X2 OsmoMSC RTP stream establishing timeout
yes net X4 OsmoBSC OsmoMSC After Clear Request, wait for MSC to Clear Command (sanity)
yes net X5 OsmoBSC Timeout to switch dynamic timeslot PCHAN modes
yes net X6 OsmoBSC Timeout for RSL Channel Activate ACK after sending RSL Channel Activate
yes net X7 OsmoBSC Timeout for RSL IPA CRCX ACK after sending RSL IPA CRCX
yes net X8 OsmoBSC Timeout for RSL IPA MDCX ACK after sending RSL IPA MDCX
yes net X9 OsmoBSC Timeout for availability of MGW endpoint
yes net X10 OsmoMSC Timeout for fully configured MGW endpoint
yes X1001 OsmoSGSN RANAP Release timeout. Wait for RANAP Release Complete. On expiry release Iu connection (s)
yes mgw X2427 from libosmo-mgcp-client: OsmoBSC OsmoMSC timeout for MGCP response from MGW
yes net X3111 OsmoBSC Wait time after lchan was released in error (should be T3111 + 2s)
yes net X3210 OsmoBSC After L3 Complete, wait for MSC to confirm
yes X3314 OsmoSGSN Iu User inactivity timer. On expiry release Iu connection (s)
yes X4222 OsmoHLR GSUP Update Location timeout
yes X3111 OsmoMSC Wait time after lchan was released in error (should be T3111 + 2s)
yes X3210 OsmoMSC After L3 Complete, wait for MSC to confirm
yes X2427 OsmoMSC timeout for MGCP response from MGW

Legacy timer numbers: specific to Osmocom, but were once defined as T timers

configurable Legacy T timer corresponding X timer Software Purpose
yes T999 net X4 OsmoBSC After Clear Request, wait for MSC to Clear Command (sanity)
no T2427001 mgw X2427 libosmo-mgcp-client OsmoBSC OsmoMSC timeout for MGCP response from MGW
yes T993111 net X3111 OsmoBSC Wait time after lchan was released in error (should be T3111 + 2s)
yes T993210 net X3210 OsmoBSC After L3 Complete, wait for MSC to confirm
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