What is CQI Reporting in LTE?
The CQI indicates the highest modulation and the code rate at which the block error rate (BLER) of the channel being ana- lyzed does not exceed 10 %. Index 0 indicates that the UE has not received any usable LTE signals and that the channel is inoperable. The CQI report for the UE has a wide variety of settings.
What is CSI LTE process?
CSI stands for Channel Status Information. As the name implies, it is a kind of indicator how good or bad the channel is at a specific time.
How does LTE PMI work?
LTE PMI. The LTE UE use PMI information to signal preferred set of weights to be applied during the precoding process. UE does this in order to maximize the downlink S/N ratio. Based on following configurations one out of 4 is used by LTE UE.
In which type of CQI feedback mode the UE reports CQI PMI and RI with reporting periods configured by the higher layer on the Pucch?
Periodic reporting
Periodic reporting: the UE reports CQI, PMI, and RI with reporting periods configured by the higher layer. PUCCH is used for this.
What is a good CQI value in LTE?
1) Current Communication Channel Quality is this-and-that.. In HSDPA, the CQI value ranges from 0 ~ 30. 30 indicates the best channel quality and 0,1 indicates the poorest channel quality.
How is CQI measured 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 can I improve my CQI LTE?
Transition to Higher CQI layer Consider two LTE layers, for instance L800 and L1800 with same bandwidth. In this case, L800 will have a higher coverage as it is a lower frequency. So, the user count on L800 will be higher compared to L1800.
What is CSI signal?
In wireless communications, channel state information (CSI) refers to known channel properties of a communication link. This information describes how a signal propagates from the transmitter to the receiver and represents the combined effect of, for example, scattering, fading, and power decay with distance.
What is PMI and RI in LTE?
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. Adaption Feedback for 3GPP UMTS/LTE.
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.
How many CQI indices are defined in LTE?
15 codes
In LTE, CQI has only 15 codes. MCS parameter is assigned based on the CQI value.
What is CQI range in LTE?
between 0 and 15
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.