What is reselection LTE?
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 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)
What is cell search in LTE?
Cell searching is a procedure in which a UE achieves time and frequency synchronization with a cell, obtains the physical cell identifier (PCI), and learns the signal quality and other information about the cell based on the PCI. A UE performs cell search on all frequencies before selecting or re-selecting to a cell.
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.
What is cell reselection in 5g?
Cell reselection identifies the cell that the UE should camp on. It is based on cell reselection criteria which involves measurements of the serving and neighboring cells. SIB1 together with SIB2-5 are sent over the air so that the UE get proper parameters to do correct cell selection and reselection decisions.
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 MIB and SIB?
System information is broadcast using a Master Information Block (MIB) and a series of System Information Blocks (SIB). General importance of MIB and SIB 1 for LTE in pictorial format. UE starts by reading the MIB and this provides sufficient information to read SIB 1.
How many SIBs are there in LTE?
As the functionalities of LTE evolves and start interplay with other radio technologies (e.g, wlan, V2X, NR etc), the list of SIB is getting longer and longer. We first started with around 12 SIBs and now (as of Jan 2020. Release 15), the largest SIB Type number is SIB24.
What is PSS and SSS in 5G?
PSS stands for Primary Synchronization Signal, SSS stands for Secondary Synchronization Signal and ESS stands for Extended Synchronization Signal. Radio frame in 5G-TF is 10ms in duration. It has total 100 slots or 50 subframes. Each subframe consists of two consecutive slots.
What is Inter RAT handover in LTE?
Inter RAT Handover (Target) Handover from an E-UTRAN to a different RAT. The procedure for when a UE is entering the E-UTRAN cell. Intra eNB Handover (Source) Handover from one sector to another managed by the same eNB.
What is the difference between MIB and SIB in LTE?
Static part is called as MIB and is transmitted using BCH and carried by PBCH once every 40ms. Dynamic part is called as SIB and is mapped on RRC SI messages(SI-1,2,3,4,5,6,7,8,9,10,11) over DL-SCH and transmitted using PDSCH at periodic intervals. SI-1 transmitted every 80ms, SI-2 every 160ms and SI-3 every 320 ms.
Where does s _ intrasearch ( SiB3 ) send in UE?
If S_intrasearch (SIB3) is sent in the serving cell and S_servingCell (Srxlev) > S_instrasearch, UE may choose to not perform intra-frequency measurement
What happens if s _ nonintrasearch is sent in serving cell?
If S_nonintrasearch(SIB3) is sent in the serving cell and S_servingCell(Srxlev) > S_nonintrasearch, UE may choose not to perform the neighbor cell measurement
Which is the highest priority for LTE SiB4?
(These priorities can be specified in LTE SIB4,5,6,7 and RRC Connection Release). Priority 0 indicate the lowest priority and 7 indicate the highest priority. The priority cannot be same for WCDMA and LTE, meaning that it must be set differently for different RAT.
When to use srxlev and threshxhigh on LTE?
ThreshXHigh: The threshold used in the UE to reselect a frequency whose priority is higher than the current camped frequency.If the user has to move from a low priority LTE frequency band to higher priority LTE then the neighbor/ target LTE must have the Srxlev>ThreshXHigh. Settings 12/14
https://www.youtube.com/watch?v=gI3OvLdgW_I