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What is reselection in telecom?

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 cell selection and reselection?

Cell selection is a process when mobile is switched on. An UE (User Equipment) measure nearby rat-cell and select a suitable rat-cell before entering cell reselection. UE performs cell reselection to aim better quality cell by re-measuring nearby rat-cell.

What is cell reselection in LTE?

Cell Re selection is a procedure used to change the cell after the UE is camped on a cell and stays in the Idle mode. This procedure is used to let the UE get camped on a cell which has the best radio conditions among all the other cells on which the UE is allowed to camp on.

What is cell reselection GSM?

Inter-system cell reselection between WCDMA and GSM enables the user equipment in idle mode to choose a new cell of another system to camp on, thus providing service availability when WCDMA coverage fades out.

What is SIB1 in LTE?

SIB1 contains cell access related information (e.g. a PLMN identity list, tracking area code, cell identity, etc.), information for cell selection (e.g. minimum required Rx level in the cell and offset), p-Max, frequency band indicator, scheduling information, TDD configuration, SI-window length and system information …

What is 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 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 idle mode in LTE?

In idle mode, the UE performs cell reselection to access the cell with the best radio signal quality. The network provides the UE a white list of neighboring cells that the UE needs to consider in measurements for possible cell reselection.

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.

How does LTE stuff work?

The LTE network is based on Internet Protocol (IP) standards, the kind that delivers Web pages to your computer, and adds voice data to the transmission streams [source: 4G Americas]. It uses a schematic called OFDMA, or Orthogonal Frequency Division Multiple Access, which is similar to the OFDM approach in WiMAX.

What is LTE call flow?

With Long Term Evolution (LTE) comes a myriad of new and exciting attributes. One of these is the LTE call flow itself. In fact, call flow and signaling is unique for LTE, and is driven by 3GPP standards. Call flow is how signaling and sessions are created across an LTE network.

What is X2 handover?

Intra-LTE (Intra-MME/SGW) handover using the X2 interface is used to handover a UE from a source eNodeB (S-eNB) to a target eNodeB (T-eNB) using the X2 interface when the Mobility Management Entity (MME) and Serving Gateway (SGW) are unchanged.

When to make a cell reselection from 2G to 3G?

After that the UE makes a cell reselection from 2G to 3G. This is the new mapping table default 1). This parameter is hidden and it can not be tuned measurements as often as possible.

What are the criteria for cell reselection for LTE?

These criteria for cell selection as well as cell reselection for LTE are specified in [3]. It is further illustrated by a description of the two procedures: In the initial cell selection procedure, as described in the previous sections, no knowledge about RF channels carrying an E-UTRA signal is available at the UE.

When to use s in cell reselection procedure?

S is the criterion defined to decide if the cell is still suitable . This criterion is fulfilled when the cell selection receive level is is computed based on the Equation below: is the measured receive level value for this cell, i.e. the Reference Signal Received Power (RSRP).

How does UE Use Radio resources in serving cells?

So UE has to release the radio connection (in serving cell) and use the target cell info provided in the RRC Reconfiguration (if any, else UE needs to do full scan) to camp and further request for the radio resources in target cells.