name: T3370
full_form: Timer for identification procedure supervision
context: The following abnormal cases can be identified: a) Lower layer failure Upon detection of a lower layer failure before the IDENTITY RESPONSE is received, the network shall abort any ongoing GMM procedure. b) Expiry of timer T3370 The identification procedure is supervised by the network by the timer T3370. The network shall, on the first expiry of the timer T3370, retransmit the IDENTITY REQUEST message and reset and restart the timer T3370. This retransmission is repeated four times, i.e. on the fifth expiry of timer T3370, the network shall abort the identification procedure and any ongoing GMM procedure. c) Collision of an identification procedure with a GPRS attach procedure If the network receives an ATTACH REQUEST message before the ongoing identification procedure has been completed and no GPRS attach procedure is pending on the network (i.e. no ATTACH ACCEPT/REJECT message has still to be sent as an answer to an ATTACH REQUEST message), the network shall proceed with the GPRS attach procedure. d) Collision of an identification procedure with a GPRS attach procedure when the identification procedure has been caused by a GPRS attach procedure If the network receives an ATTACH REQUEST message before the ongoing identification procedure has been completed and a GPRS attach procedure is pending (i.e. an ATTACH ACCEPT/REJECT message has to be sent as an answer to an earlier ATTACH REQUEST message), then: - If one or more of the information elements in the ATTACH REQUEST message differs from the ones received within the previous ATTACH REQUEST message, the network shall proceed with the GPRS attach procedure; or - If the information elements do not differ, then the network shall not treat any further this new ATTACH REQUEST. d1) Collision of an identification procedure with an MS initiated GPRS detach procedure GPRS detach containing cause "power off": If the network receives a DETACH REQUEST message before the ongoing identification procedure has been completed, the network shall abort the identification procedure and shall progress the GPRS detach procedure. GPRS detach containing other causes than "power off": If the network receives a DETACH REQUEST message before the ongoing identification procedure has been completed, the network shall complete the identification procedure and shall respond to the GPRS detach procedure as described in subclause 4.7.4. e) Collision of an identification procedure with a routing area updating procedure If the network receives a ROUTING AREA UPDATE REQUEST message before the ongoing identification procedure has been completed, the network shall progress both procedures. f) Collision of an identification procedure with a service request procedure If the network receives a SERVICE REQUEST message before the ongoing identification procedure has been completed, the network shall progress both procedures. Figure 4.7.8/1 3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ] : Identification procedure
description: T3370 is a timer used by the network to supervise the identification procedure in mobile communication networks, as specified in 3GPP TS 24.008. It ensures that the identification process does not exceed a certain time limit and triggers retransmission of the IDENTITY REQUEST message if necessary.
explanation: T3370 is classified as a Timer because it is specifically used for timing purposes within the network, controlling how long an identification procedure can take before it is either completed or aborted. This aligns with the definition of timers in telecommunications, which are mechanisms to measure time intervals and trigger actions based on these measurements.
section_title: 4.7.8.4 Abnormal cases on the network side
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