What is LTE threshold?
The Threshold-RSRP IE specifies the linear average of reference signal power across the specified bandwidth. This is the most important item UE has to measure for cell selection, re-selection and handover. -120dbm (dB – milliwatt) is the threshold for losing signal on LTE when measured with RSRP.
What are the measurement events in LTE?
LTE Measurement Report Trigger (EVENT for Measurement Report)
| Event Type | Description |
|---|---|
| Event A2 | Serving becomes worse than threshold |
| Event A3 | Neighbour becomes offset better than serving |
| Event A4 | Neighbour becomes better than threshold |
| Event A5 | Serving becomes worse than threshold1 and neighbour becomes better than threshold2 |
What is a measurement report?
Measuring Report means the document indicating the item being measured and its identification data, values measured and calculated, date, time and place of measurement, measuring devices used, full names and positions of employees who performed and/or witnessed the measuring.
What is a B1 measurement in 5g?
Event B1 (Inter RAT neighbour becomes better than threshold) Event B1 can be used for inter-RAT handover procedures which does not depend upon the coverage of the serving cell. For example, in load balancing feature take the decision to move a UE away from NR due to load conditions rather than radio conditions.
What is A4 event in LTE?
Event A4. The LTE Event A4 is triggered when a neighbouring cell becomes better than a threshold. MEASneigh + Oneigh,freq + Oneigh,cell – Hyst > Threshold. Triggering of the event is subsequently cancelled when the following condition is true: MEASneigh + Oneigh,freq + Oneigh,cell + Hyst
How should measurements be reported?
Starting with the first nonzero digit on the left, count this digit and all remaining digits to the right. This is the number of significant figures in the measurement unless the last digit is a trailing zero lying to the left of the decimal point.
What is measurement gap in 5G?
Meas Gap Lengths (MGL): 1.5 ms, 3 ms, 3.5 ms, 4 ms, 5.5 ms and 6 ms. Meas Gap Repetition Period (MGRP): 20 ms, 40 ms, 80 ms and 160 ms.
What is L3 filtering in LTE?
L3 filtering can be done in linear domain or decibel (dB) domain. A hard handover algorithm based on the downlink RSS and CIR measurements along with linear and dB domain L3 filtering has been studied by using a dynamic system level simulator for a 3GPP UTRAN LTE recommended scenario.
What is PMI and RI?
PMI stands for Pre-coding Matrix Indicator, and RI is Rank Indicator. These three values are computed on the fly in LTE systems and used to try to optimize resource allocation among the various user end devices (UEs) that are requesting service.
What is A3 offset in LTE?
Event A3 is defined as a triggering event when a neighbour cell becomes an offset better than the serving cell. The UE creates a measurement report, populates the triggering details and sends the message to the serving cell.
What is B1 event?
LTE Event B1 The LTE Event B1 is triggered when a neighbouring inter-system cell becomes better than a threshold. The event is triggered when the following condition is true: MEASneigh + Oneigh,freq – Hyst > Threshold.
What is the use of A1 A2 and A3 event?
Measurment Event
| Event Type | Description |
|---|---|
| Event A1 | Serving becomes better than threshold |
| Event A2 | Serving becomes worse than threshold |
| Event A3 | Neighbour becomes amount of offset better than PCell/PSCell |
| Event A4 | Neighbour becomes better than threshold |
How do you measure data accuracy?
How to measure accuracy and precision
- Average value = sum of data / number of measurements.
- Absolute deviation = measured value – average value.
- Average deviation = sum of absolute deviations / number of measurements.
- Absolute error = measured value – actual value.
- Relative error = absolute error / measured value.
How do you write measurement uncertainty?
Uncertainties are almost always quoted to one significant digit (example: ±0.05 s). If the uncertainty starts with a one, some scientists quote the uncertainty to two significant digits (example: ±0.0012 kg). Always round the experimental measurement or result to the same decimal place as the uncertainty.
How many significant figures did you use in reporting your measurements?
Solutions
| Rule | Examples |
|---|---|
| 1. All nonzero digits in a measurement are significant. | 237 has three significant figures. 1.897 has four significant figures. |
| 2. Zeros that appear between other nonzero digits (middle zeros) are always significant. | 39,004 has five significant figures. 5.02 has three significant figures. |
What is the difference between A3 and A4 and A5 threshold?
It will setup measurement gap. A3 : Neighbour becomes offset better than serving. It will trigger Intra-LTE handover A4 : Neighbour becomes better than threshold. A5 : Serving becomes worse than threshold1 and neighbour becomes better than threshold2.
What is a measurement report trigger in LTE?
LTE Measurement Report Trigger (EVENT for Measurement Report) One of the most important step for Handover is Measurement Report from UE before the handover. Network make a decision on whether it will let UE handover or not, based on the measurement value from UE.
What triggers measurement report?
Simply put, Measurement Report is triggered by whether the measured value crosses (goes higher or goes lower) a certain target value. The target value can be set by one of two methods.
What is the predefined measurement report type called?
These predefined measurement report type is called “Event”. What kind of “event” a UE has to report is specified by RRC Connection Reconfiguration message as follows (shown in red). +-rrcConnectionReconfiguration ::= SEQUENCE