What is T3412 timer?
Periodic TAU The value of timer T3412 is sent by the network to the UE in the ATTACH ACCEPT message and can be sent in the TRACKING AREA UPDATE ACCEPT message. The UE shall apply this value in all tracking areas of the list of tracking areas assigned to the UE, until a new value is received.
What tau timer?
The time τ (tau) is referred to as the “time constant” and can be used (as in this case) to indicate how rapidly an exponential function decays. Here: t is time (generally t > 0 in control engineering)
What is tracking area update in LTE?
The LTE UE detects a change to a new TA (Tracking Area) by decoding the TAI (Tracking Area Identity) broadcast on the serving cell that it has just selected. This is done by comparing this value with the list of TAI that the UE has registered in the network.
What is Tai in LTE?
Tracking Area Identity. The Tracking Area identity is the identity used to identify tracking areas. The Tracking Area Identity is constructed from the MCC (Mobile Country Code), MNC (Mobile Network Code) and TAC (Tracking Area Code).
What is tau 4g?
Tracking Area Update(TAU) in LTE is similar to a Location Area Update/Routing Area Update in GSM and WCDMA. There are 3 kinds of Tracking Area Update.
What is LTE time advance?
LTE: Timing Advance and Time Alignment Timer. Timing advance is a negative offset, at the UE, between the start of a received downlink subframe and a transmitted uplink subframe. This offset at the UE is necessary to ensure that the downlink and uplink subframes are synchronised at the eNodeB.
What is ECGI in LTE?
ECGI : It indicates the E-UTRAN cell global identifier. MCC: It indicates the country code of the mobile subscriber. MNC: Its indicates the code of network used by the mobile subscriber. Cell Identity: It is of 28 bits. The former 20 bits indicate the eNodeB ID, and the latter 8 bits indicate the cell ID.
What is tau and Rau?
Folks familiar with EUTRAN might recognise TAU as Tracking Area Update, while RAU is Routing Area Update in GERAN/UTRAN (UMTS). Periodic tracking area updating is used to periodically notify the availability of the UE to the network.
What is tau in 5G?
Abstract: In Long Term Evolution (LTE) and future 5 th Generation (5G) wireless networks, the two procedures that are essential to track and locate mobile User Equipments (UEs) within the network are known as Tracking Area Update (TAU) and Paging.
Why timing advance is used?
Timing Advance is significant for privacy and communications security, as its combination with other variables can allow GSM localization to find the device’s position and track the mobile phone user. TA is also used to adjust transmission power in space-division multiple access systems.
What is normal timing advance?
Most stock street engines call for 6 to 8 degrees of initial advance, but this is not set in stone. Engines with longer duration camshafts and other modifications often demand more initial timing.
What is CGI in LTE?
Cell Global Identity (CGI) is a globally unique identifier for a Base Transceiver Station in mobile phone networks. It consists of four parts: Mobile Country Code (MCC), Mobile Network Code (MNC), Location Area Code (LAC) and Cell Identification (CI).
What is Rau in LTE?
RAU stands for Routing Area Update in LTE system. It mentions RAU procedure without S-GW change and with S-GW change.
How does LTE timing advance work?
In LTE, when UE wish to establish RRC connection with eNB, it transmits a Random Access Preamble, eNB estimates the transmission timing of the terminal based on this. Now eNB transmits a Random Access Response which consists of timing advance command, based on that UE adjusts the terminal transmit timing.
What is LTE timing advance?
What is the t3412 timer?
If there is ISR.. If ISR is activated, the UE shall keep both the periodic tracking area update timer (timer T3412) and the periodic route ing area update timer (timer T3 3 12). The two separate timers run in the UE for updating MME and SGSN independently.
How to stop the timer t3423 when Emm-registered?
The UE shall initiate the tracking area updat ing procedure and stop the timer T3423 when it enters state EMM-REGISTERED.NORMAL-SERVICE before timer T3423 expires. After expiry of timer T3423 the UE shall set its TIN to ” P-TMSI “.
What is the duration after t3324 timer expiry?
The duration after T3324 Timer expiry and the next pTAU instance is the HIBERNATE period. Note: The UE/Device is not reachable by a Mobile Terminated message/SMS during the PSM/Hibernate state.
Why is the mobile reachable timer greater than t3412?
If the UE is not attached for emergency bearer services, the mobile reachable timer shall be longer than T3412. In this case , by default, the mobile reachable timer is 4 minutes greater than T3412.