Cellular Network Infrastructure

h1. List of Timer numbers

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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.

h2. 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) |

h2. Timers specific to Osmocom

|_.configurable|_.Timer|_.Program|_.Purpose|

| yes | bts X1 | [[OsmoBTS:]] | Time after which osmo-bts exits if regular ramp down during shut down process does not finish (s) |

| yes | bts X2 | [[OsmoBTS:]] | Time after which osmo-bts exits if requesting transceivers to stop during shut down process does not finish (s)|

| yes | mgw X2 | [[OsmoMSC:]] | RTP stream establishing timeout |

| 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 | net X4 | [[OsmoBSC:]] | 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 | [[OsmoBSC:]] | Timeout for fully configured MGW endpoint |

| yes | net X11 | [[OsmoBSC:]] | Timeout for Perform Location Response from SMLC |

| yes | net X12 | [[OsmoBSC:]] | Timeout for obtaining TA in BSC after BSSLAP TA Request |

| yes | X12 | [[OsmoSMLC:]] | Timeout for BSSLAP TA Response from BSC |

| yes | net X13 | [[OsmoBSC:]] | Timeout for RR Channel Mode Modify ACK (BSC <-> MS)|

| yes | net X14 | [[OsmoBSC:]] | Timeout for RSL Channel Mode Modify ACK (BSC <-> BTS)|

| yes | abis X15 | [[OsmoBTS:]] | Time to wait between Channel Activation and dispatching a cached early Immediate Assignment|

| yes | net X16 | [[OsmoBSC:]] | Granularity for all_allocated:* rate counters: amount of milliseconds that one counter increment represents. See also X17, X18 |

| yes | net X17 | [[OsmoBSC:]] | Rounding threshold for all_allocated:* rate counters: round up to the next counter increment after this many milliseconds. If set to half of X16 (or 0), employ the usual round() behavior: round up after half of a granularity period. If set to 1, behave like ceil(): already increment the counter immediately when all channels are allocated. If set >= X16, behave like floor(): only increment after a full X16 period of all channels being ccupied. See also X16, X18 |

| yes | net X18 | [[OsmoBSC:]] | Forget-sum period for all_allocated:* rate counters: after this amount of idle time, forget internally cumulated time remainders. Zero to always keep remainders. See also X16, X17. |

| yes | X19 | [[OsmoUPF:]] | PFCP Heartbeat Request period, how long to wait between issuing requests |

| yes | X20 | [[OsmoUPF:]] | PFCP Heartbeat Response timeout, the time after which to regard a non-responding peer as disconnected |

| yes | X21 | [[OsmoUPF:]] | PFCP peer graceful shutdown timeout, how long to keep the peer's state after a peer requested graceful shutdown |

| yes | X22 | [[OsmoUPF:]] | PFCP request timeout, how long after a missing response to retransmit a PFCP request |

| yes | X23 | [[OsmoUPF:]] | Number of PFCP request retransmission attempts |

| yes | X24 | [[OsmoUPF:]] | PFCP response timeout, how long to keep a response, in case its same request is retransmitted by the peer |

| yes | net X25 | [[OsmoBSC:]] | Timeout for initial user data after an MSC initiated an SCCP connection to the BSS |

| yes | pfcp X26 | [[OsmoHNBGW:]] | Idle time between attempts of PFCP Association Setup (CPF) |

| yes | net X27 | [[OsmoBSC:]] | Time after which to release an lchan when not receiving L1 Info in MEAS RES |

| yes | net X28 | [[OsmoBSC:]] | Wait time before trying to recover a BORKEN timeslot ("WIP":https://gerrit.osmocom.org/c/osmo-bsc/+/30252) |

| yes | cmap X31 | [[OsmoHNBGW:]] | Timeout for discarding a partially released context map (RUA <-> SCCP) |

| yes | nft X32 | [[OsmoUPF:]] | How long to collect nft rulesets before flushing in batch |

| yes | nft X33 | [[OsmoUPF:]] | When surpassing this string length of combined nft rulesets, flush early |

| yes | X1001 | [[OsmoSGSN:]] | RANAP Release timeout. Wait for RANAP Release Complete. On expiry release Iu connection (s) |

| yes | mgw X2427 | from [[OsmoMGW:|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 |

h3. 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 | [[OsmoMGW:|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 |