What is LTE IRAT?

What is LTE IRAT?

IRAT stands for Inter Radio Access Technology. RAT can be either GSM,CDMA,WiMAX,LTE,TD-SCDMA or any other wireless technology used to provide air interface to mobile to obtain various services(voice,email,internet,VOIP).

What is cell reselection GSM?

Cell re-selection procedure is the process by which UE/Mobile finds the suitable cell to camp on. This is applied to any mobile supporting GSM or CDMA or HSPA or any other network. It should be noted that path loss between Mobile and BTS/eNode must be less than threshold set by the operator(of that PLMN).

What is cell reselection in 5G?

In 5G, Cell reselection can be based upon a cell level and beam level measurements. When the gNB transmits multiple beams, a UE is required to generate a cell level measurement from one or more beam level measurements.

What is cell selection?

When you power on the mobile device, in most case the device is under a circumstance where it sees many base station (eNode B) around it. For this UE goes through a specific decision making process to pick up a specific base station (cell) to register, this specific decision making process is called ‘Cell Selection’.

What is reselection in telecom?

Cell Reselection is a kind of mechanism to change cell after UE is camped on a cell and stay in IDLE mode. This is to let UE get connected to cell which has the best condition among all the cells to which the UE is allowed to camp on.

What is the difference between cell reselection and handover?

While handover controls the mobility of UE in Connected (EMM-Registered, ECM-Connected and RRC-Connected) state, cell reselection controls the same while in Idle (EMM-Registered, ECM-Idle and RRC-Idle) state.

Which system information are used in idle mode?

The system information block type 1 contains NAS system information to be used by UEs in idle mode. The system information block type 2 contains the URA identity and information for periodic cell and URA update.

What is SIB3 LTE?

The SystemInformationBlockType3 (SIB3) contains cell re-selection information common for intra-frequency, inter-frequency and/or inter-RAT cell re-selection (i.e. applicable for more than one type of cell re-selection but not necessarily all)

How cell selection happens in LTE?

Initial Cell Selection At each carrier frequency, UE searches for the strongest cell only. If the UE finds a Suitable Cell, it selects that cell to camp on. If the UE fails to find a Suitable Cell, it selects an Acceptable Cell to camp on.

What is reselection LTE?

What is LTE Handover?

Abstract: Handover in LTE occurs when a device moves from the cell coverage serving it towards another; a process where the user established session must not be interrupted due to this cell change.

What is the difference between Handover and redirection in LTE?

In Handover procedure, target cell allocates all the required radio resources (Radio bearers and dedicated PRACH resource) upfront for the UE to move seamlessly. UE stays in connected mode during this procedure. In Redirection procedure, target cell will not be allocating any radio resources upfront.