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 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 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. During a handover, it is the network (MME or source eNB) that decides which cell to handover to.
What is a cell LTE?
LTE stands for Long Term Evolution and is sometimes referred to as 4G LTE. It’s a standard for wireless data transmission that allows you to download your favorite music, websites, and video really fast—much faster than you could with the previous technology, 3G. Play video.
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 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 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 SIB2 in 5G?
5G NR system information in general is discussed in detail in the post 5G NR:System Information. SIB2 contains cell re-selection information common for intra-frequency, inter-frequency and/or inter-RAT cell re-selections (i.e. applicable for more than one type of cell re-selection but not necessarily all).
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).
Is VoLTE analog or digital?
Voice over LTE (VoLTE) is a digital packet technology that uses 4G LTE networks to route voice traffic and transmit data. This voice service is the standard for high-speed wireless communications in devices such as smart phones, data terminals, IoT devices and wearables.
How does PLMN selection and reselection work in UMTS?
During PLMN selection and reselection, based on the list of allowed PLMN types and a list of PLMN identities in priority order, the particular PLMN may be selected either automatically or manually. The UE will select a PLMN when it registers at power-on or re-registers after leaving connected mode.
How does the UE select a cell from a PLMN?
If there is no registered PLMN stored in the USIM, the UE selects and attempts registration on other PLMNs using either the automatic mode or the manual mode. Once the UE has selected a PLMN, the cell selection procedure will be performed in order to select a suitable cell of that PLMN to camp on.
How does UE camp on a suitable cell?
For normal service, the UE has to camp on a suitable cell, tune to that cell’s control channel (s) so that the UE can: Identify to which service area as specified by NAS that the serving cell belongs. Initiate call setup for outgoing calls or other actions from the UE. Qqualmeas：Measured cell quality value.
When does the UE move to a new cell?
Normal update is performed when the UE moves in a cell belonging to a new LA or RA. The UE reads the LAI and the RAI in the system information and detects that one or both of the received area identities differ from the ones stored on the USIM.
