What is T3412 timer?
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 is T3402 timer in LTE?
Timer (EPS Mobile Management – UE Side)
| TIMER NUM. | TIMER VALUE | STATE |
|---|---|---|
| T3402 | Default 12 min. NOTE 1 | EMM DEREGISTERED EMM REGISTERED |
| T3410 | 15s | EMMREGISTEREDINITIATED |
| T3411 | 10s | EMM DEREGISTERED. ATTEMPTING TO-ATTACH EMM REGISTERED. ATTEMPTING TO-UPDATE |
| T3412 | Default 54 min. NOTE 2 NOTE 5 | EMM REGISTERED |
What is periodic TAU in LTE?
Periodic TAU
Periodic tracking area updating is used to periodically notify the availability of the UE to the network. The procedure is controlled in the UE by the periodic tracking area update timer (timer T3412).
What is tau procedure?
A TAU procedure is initiated when a UE enters a new TA that is not in the list of TAIs allocated by the MME at the time of the UE’s attach, or when the TAU timer expires. The EMM Case 5 presented in this document is related to the periodic TAU procedure performed by a UE upon expiration of the TAU timer.
What is 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) V0 is the initial value (see “specific cases” below).
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 tracking area update?
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 EPS bearer in LTE?
On the other hand, an EPS bearer is a pipe through which IP packets are delivered over the LTE network, i.e., between a UE and a P-GW (UE – eNB – S- GW – P-GW). A UE can have multiple EPS bearers concurrently. So, different EPS bearers are identified by their EPS bearer ID, which is allocated by an MME.
What is tau handover?
Handover with TAU. Figure 1 shows a handover procedure performed when UE in Connected state moves to a TA that it is not registered to. When the UE initially attached the network, MME selected TA1 and TA2 for the UE, and sent a TAI list = {TAI=1, TAI=2}, as included in the Attach Accept message.
What is S1 handover in LTE?
An S1 handover is a fallback for scenarios where X2 interface is not available. As the name suggests, S1 handovers take place over the S1-interface. The MME and the SGW are involved during the handover procedure.
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 LAC and TAC in LTE?
The Location Area Code/Tracking Area Code, abbreviated as LAC/TAC, is an identifier of the location area within an MNO’s network. This part of the code can be represented using hexadecimal values with a length of two octets. The served area of a cellular radio network is usually divided into location areas.
How many eNodeB are in a TAC?
Tracking Area Codes (TACs) or TAs: it is group of eNodeBs in one small area with maximum number of 100 eNodeBs.
How many Enodeb are in a TAC?
What is a tracking area code?
What is difference between radio bearer and EPS bearer?
EPS bearer is a combination of several sub bearers which are E-RAB bearer, Radio bearer, S1 bearer, S5 bearer and S8 bearer: E-RAB bearer: transports the packets of an EPS bearer between UE and SGW. Radio bearer: transports the packets of an EPS bearer between UE and eNodeB.
How many EPS bearers are used in LTE?
There are two types of EPS Bearer. One is ‘Default EPS Bearer’ and the other one is ‘Dedicated EPS Bearer’.
What is S1 and X2 handover in LTE?
LTE networks prefer using the X2 interface for performing inter eNodeB handovers. An S1 handover is a fallback for scenarios where X2 interface is not available. As the name suggests, S1 handovers take place over the S1-interface. The MME and the SGW are involved during the handover procedure.
What is S1 and X2 handover?
What is X2 handover?
The X2 handover procedure is performed without Evolved Packet Core (EPC) involvement, i.e. preparation messages are directly exchanged between the S-eNB and T-eNB. The release of the resources at the source. side during the handover completion phase is triggered by the T-eNB.
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.
Is TAC same as LAC?
Both the LAC and TAC share the same concept of providing the location code of a base station set. The only difference between LAC and TAC is that the LAC is the terminology used in GSM/UMTS while the TAC is the terminology used in LTE.
What is Tai in 5G?
Tracking Area identity (TAI): It is used to identify tracking areas. The TAI is constructed from the PLMN identity the tracking area belongs to and the TAC (Tracking Area Code) of the Tracking Area.
What is Tai in 4g?
What is LTE call flow?
The LTE call flow navigates over the elements of the network going through certain steps in order to complete its end-to-end signaling from the user equipment (UE) all the way to the rest of the network components.