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 periodic aperiodic CSI reporting?
Periodic reporting: the UE reports CQI, PMI, and RI with reporting periods configured by the higher layer. PUCCH is used for this. Aperiodic reporting: can be used to provide large and more detail reporting in a single reporting instance via PUSCH. Report Timing is triggered by DCI.
What is CQI PMI RI in LTE?
CQI is Channel Quality Indicator. 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.
Which channel carries CQI information to Enodeb?
Which Physical Channel Carriers CQI Value? CQI is carried by PUCCH or PUSCH depending on the situation as follows. Regarding CQI report period and configuration, refer to CQI, PMI, RI Reporting Configuration part. We have two different tables as shown below defined in 36.213.
How is CQI measured?
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.
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 LTE CRI?
CSI-RS Resource Indicator. This is used by LTE-Advanced and 5G devices to indicate the preferred beam, i.e. as part of FD-MIMO and Massive MIMO.
What is rank indicator 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 can I improve my CQI LTE?
The easiest way is to give a higher priority to L1800 and that will shift most of the UEs in L1800 coverage away from L800. This will ensure better CQI for users and thus a better throughput.
What is DCI in LTE?
DCI stands for Downlink Control Information. There are various DCI formats used in LTE in PDCCH. The DCI format is nothing but a predefined format in which the downlink control information is packed/formed and transmitted in PDCCH.
What is CQI range in LTE?
Channel Quality Indicator. In the LTE system, the CQI is used by the mobile to indicate the channel quality to the eNB. The CQI reported value is between 0 and 15. This indicates the level of modulation and coding the UE could operate.
What is good CQI in LTE?
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