What is attach request in LTE?

The Attach message is sent in the Initial UE message to the MME over the S1AP interface. The "Attach Request" is embedded in the Initial UE Message. The message also includes the PDN Connectivity Request message. The Tracking Area Identify (TAI) and E-UTRAN Cell Global Identifier (ECGI) are also included.

Besides, what is attach in LTE?

Attach procedure may trigger one or multiple Dedicated Bearer Establishment procedures to establish dedicated EPS bearer for that UE. During the LTE Initial Attach procedure, the Mobile Equipment Identity is obtained from the UE. The MME operator may check the Mobile Equipment Identity with EIR.

Also Know, what is Guti in LTE? In LTE, the GUTI is the Globally Unique Temporary ID, and identifies the mobile device to the LTE network. By allocating a temporary ID to the device, the MME maintains the security of the IMSI (International Mobile Subscriber Identification) when transmitting over radio interface.

Herein, what is LTE service request?

A Service Request is a procedure an UE executes when it is in Idle mode and needs to establish the bearers to send data or it needs to send signaling to the MME. The UE Triggered Service Request procedure is outlined in Figure 17.8.

How does eNodeB selects MME?

eNodeB selects an available MME to serve the UE, based typically on network topology and the location of the UE within the network, so that the best MME is selected, e.g. to reduce the probability that the MME is changed. The DNS may provide more than one MME address (candidate set) from which the eNB can select a MME.

Related Question Answers

What is modify bearer request?

LTE: Modify EPS Bearer Context Request

· The purpose of the EPS bearer context modification procedure is to modify an EPS bearer context with a specific QoS and TFT. · This procedure is initiated by the network, but it may also be initiated as part of the UE requested bearer resource allocation/modification procedure.

What is data radio bearer in LTE?

Bearer is just a virtual concept. It defines how the UE data/signaling are treated when it travels across the network. Network might treat some data in a special way and treat others normally. Radio Bearer Types.

What is NAS message in LTE?

Non-access stratum (NAS) is a functional layer in the UMTS and LTE wireless telecom protocol stacks between the core network and user equipment. Examples of NAS messages include Update or Attach messages, Authentication Messages, Service Requests and so forth.

What is RRC reconfiguration in LTE?

RRC CONNECTION RECONFIGURATION message is the command to modify an RRC connection. The purpose of this procedure is, · To establish/modify/release Radio Bearers. · To perform Handover. · To setup/modify/release Measurements.

What is PDN connectivity request in LTE?

LTE: PDN Connectivity Request

The PDN connectivity procedure is used by the UE to request the setup of a default EPS bearer to a PDN. If the UE is in EMM-IDLE mode, the Service Request procedure is performed before the PDN Connectivity procedure can be initiated.

What is SGW and PGW in LTE?

MME vs PGW vs SGW in LTE | MME,PGW,SGW functions in LTE. MME stands for Mobility Management Entity, PGW stands for PDN gateway and SGW stands for Serving Gateway. The figure depicts LTE EPS architecture. In the figure, UE refers to User Equipment. It is the mobile phone device used to access the LTE network.

What is initial context setup in LTE?

Initial UE Message contains an Attach Request and PDN Connectivity Request. The message contains UE specific information like the PLMN and Tracking Area. The MME allocates 211 as the MME-UE-S1AP-ID for the session. The UE and the Network mutually authenticate each other. This is followed by setting up encryption.

What is IMS call flow?

The calling IMS subscriber is currently roaming outside the home network. The called user is registered in the home network. The caller and the called user require resource reservation before the call can be setup.

What is Gummei?

However, a GUMMEI (Globally Unique MME Identifier), combination of a PLMN ID and an MMEI, is used when identifying an MME outside of the network of the operator (e.g. when “C” is operating the networks of “A” and “B” LTE operators, and “C” needs to identify an MME in “A” LTE network).

What is the PLMN in LTE?

A PLMN is identified by a globally unique PLMN code, which consists of a MCC (Mobile Country Code) and MNC (Mobile Network Code). Hence, it is a five- to six-digit number identifying a country, and a mobile network operator in that country, usually represented in the form 001-01 or 001–001.

How do I read my IMSI number?

Finding the SIM number in Settings

1. Open your Apps list and tap on Settings. Scroll to the bottom of the menu and press About.
2. Tap Status. On some phones like HTCs, this may be called 'Phone Identity'.
3. Tap IMEI Information.
4. Your SIM number will show as either the 'IMSI' number, or the 'ICCID number'.

What is Guti in 5g?

5G Global Unique Temporary Identifier [5G – GUTI] is a core network temporary identifier and allocated by Access and Mobility Management function [AMF] to the UE. GUTI is 80 bits long core network identifier. It is consist of major three network identities PLMN + AMF ID + TMSI.

What is the IMSI number?

An International Mobile Subscriber Identity (IMSI) is a unique number associated with all Global System for Mobile Communications (GSM) and Universal Mobile Telecommunications System (UMTS) network mobile phone users used for identifying a GSM subscriber.

What is Plmn in 5g?

The PLMN area is the geographical area in which a PLMN provides communication services according to the specifications to mobile users. In the PLMN area, the mobile user can set up calls to a user of a terminating network. Terminating network users can also set up calls to the PLMN.

What is the function of MME in LTE?

According to LTE University, LTE MME is responsible for initiating paging and authentication of the mobile device. MME retains location information at the tracking area level for each user and then selects the appropriate gateway during the initial registration process.

What is Sgsn MME?

It not only supports all 3GPP access types (GSM, WCDMA and LTE) as well as non-3GPP accesses (Wi-Fi and CDMA), being the central network function for mobility and session management, Ericsson SGSN-MME provides superior scalability and performance.

How does MME selects SGW?

Following the PGW selection, the MME query the DNS Server to select an available SGW to serve the UE using the TAC, which in most cases is based on network topology and the location of the UE within the network, so that the best SGW is selected.

What is MME pool in LTE?

An MME pool area is an area through which the mobile can move without a change of serving MME. Every pool area is controlled by one or more MMEs, while every base station is connected to all the MMEs in a pool area by means of the S1-MME interface. Pool areas can also overlap.

What is MME in mobile network?

The mobility management entity (MME), which presents a key control node for the LTE access network, manages UE access network and mobility, as well as establishing the bearer path for UE's. The MME also controls mobility between LTE and 2G/3G access networks.

What is UE context release in LTE?

This message is sent by the MME to request the release of the UE-associated S1-logical connection over the S1 interface.