What is measurement report in LTE?
Measurement Reports in 4G LTE are a way for a UE (“User Equipment”) or the mobile terminal to keep track of different signal strength measurements and report to the eNodeB if certain conditions are met. These conditions as reported as Measurement Reports assist the eNodeB in making handover decisions.
What is CQI Reporting in LTE?
The LTE CQI stands for Channel Quality Information. It basically includes CQI, PMI,RI components. The requirement for each of these components depend on transmission mode. All transmission modes need UE to provide CQI feedback. As mentioned in the figure, LTE CQI reports can be aperiodic or periodic.
What is 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 A3 event in LTE?
Event A3. The LTE Event A3 is triggered when a neighbouring cell becomes better than the serving cell by an offset. The offset can be either positive or negative.
What is a good SNR value in LTE?
Generally, a signal with an SNR value of 20 dB or more is recommended for data networks where as an SNR value of 25 dB or more is recommended for networks that use voice applications.
What is offset and hysteresis in LTE?
Offset: this parameter is for serving cell should be better than neighbour cells before going to send measurement report, ensure that serving cell power should be good than neighbours. Hysteresis: this is for Neighboring cell should be better than serving.
What is periodic and aperiodic CQI reporting in LTE?
There are two types of CQI transmission : Periodic and Aperiodic. Periodic CQI : CQI is transmitted periodically with a certain interval specified by higher layer message(e.g, RRC Connection Reconfiguration, RRC Connection Setup). Aperiodic CQI : CQI is transmitted by a special trigger (e.g, DCI0, RACH Response).
What is a good CQI value in LTE?
In HSDPA, the CQI value ranges from 0 ~ 30. 30 indicates the best channel quality and 0,1 indicates the poorest channel quality. Depending which value UE reports, network transmit data with different transport block size.
What is performance measurement reporting?
The Performance Measurement Reporting System (PMRS) is designed to fill the DHE’s statutory obligation to “promote accountability for effective management and stewardship of public funds and to achieve and demonstrate measurable educational outcomes” (MGL, Chapter 15a, Section 7).
What is A5 event in LTE?
LTE Measurement Report Trigger (EVENT for Measurement Report)
| Event Type | Description |
|---|---|
| Event A4 | Neighbour becomes better than threshold |
| Event A5 | Serving becomes worse than threshold1 and neighbour becomes better than threshold2 |
| Event A6 | Neighbour become offset better than S Cell (This event is introduced in Release 10 for CA) |
What is A4 measurement in LTE?
What is A1 event in LTE?
LTE Event A1 is triggered when the serving cell becomes better than a threshold.
How is CQI calculated in LTE?
CQI (Channel Quality Indication) – Instead of expressing the CQI as a received signal quality, the CQI expressed as a data rate that terminal (UE) can support under the actual radio conditions. SINR is used for calculating CQI. In LTE, CQI has only 15 codes. MCS parameter is assigned based on the CQI value.
How SNR is calculated in LTE?
Suppose, LTE signal is 5MHz of bandwidth, with QPSK modulation and Code rate of 1/3. From SNR table, corresponding required SNR is -1dB. Suppose, NF of LTE receiver chain is around 5dB. Now if you increase the modulation to be 16QAM with code rate of 2/3, the required SNR becomes 11.3dB (as per table in SNR section).
What is measurement gap in LTE?
Typical LTE gap length is 6 ms which accommodates 5 ms measurement time (PSS and SSS are transmitted once every 5 ms) and RF re-tuning time of 0.5 ms before and after the measurement gap. The measurement gap repeats with a periodicity of either 40 ms or 80 ms.
What is TM3 and TM4 in LTE?
What we normally call ‘Diversity’ is called ‘TM2’. What we call ‘MIMO’ but no feedback from UE is called ‘TM3’. MIMO and UE feedback from UE (CQI, PMI, RI) is called ‘TM4’. A good summary of each Transmission Mode can be as following table from 36.213.
What is rank index in LTE?
Rank indicator is one of the channel state information parameter. Reported by UE and indicates how favorable are channel conditions for MIMO. For example, If UE reports it as 4, it means UE has favorable channel conditions to receive DL data upto 4 layers.
How is CQI calculated?
What is the reason for poor CQI in LTE?
b) If low CQI values are found after a CQI report is obtained, then downlink interference might be the cause of low throughput. a) Run a report for BLER in the cells identified. The BLER should be smaller or equal than 10%. If the value is larger, then, there is an indication of bad RF environment.
What are 5 performance measures?
There are five specific types of measures that have been identified, defined and will be applied throughout Iowa state government: input, output, efficiency, quality and outcome.
How do you do performance reporting?
How to create a performance report
- Organize your data. Collaborate with teams to collect the relevant data you need for your report.
- Follow a template.
- Write the report.
- Proofread before sharing.
- Monitor continuously.
What is A3 event?
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 the TTI in LTE?
TTI, Transmission Time Interval, is a parameter in UMTS (and other digital telecommunication networks) related to encapsulation of data from higher layers into frames for transmission on the radio link layer. TTI refers to the duration of a transmission on the radio link.
Why do we need a measurement gap?
The UE needs measurement gaps to perform measurements when it cannot measure the target carrier frequency while simultaneously transmitting/receiving on the serving cell. In the case of LTE, the UE needs measurement gaps in order to perform inter-frequency and inter-RAT measurements.