How is CQI calculated?
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 does UE measure CQI?
The Channel Quality Indicator (CQI) contains information sent from a UE to the eNode-B to indicate a suitable downlink transmission data rate, i.e., a Modulation and Coding Scheme (MCS) value. CQI is a 4-bit integer and is based on the observed signal-to-interference-plus-noise ratio (SINR) at the UE.
What is CQI index?
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 a good CQI value?
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. Depending which value UE reports, network transmit data with different transport block size.
What is CQI Reporting in LTE?
CQI stands for Channel Quality Indicator. As the name implies, it is an indicator carrying the information on how good/bad the communication channel quality is. This CQI is for HSDPA. (LTE also has CQI for its own purpose).
What is MCS and CQI?
MCS is the modulation and coding scheme that the eNB and UE agreed on. The CQI is a 4-bit integer and is based on the received signal-to-interference-plus-noise ratio (SINR) at the User Equipment (UE) .
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.
What is PMI and RI?
What is a good CQI value in LTE?
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.
How is MCS calculated?
MCS (Modulation and Coding Scheme) defines how many useful bits can be transmitted per Resource Element (RE). MCS depends on radio link quality. And vice versa the worse radio conditions the lower MCS and the less useful data can be transmitted. In other words MCS depends on error probability.
What is PMI RI?
What is Continuous Quality Improvement CQI?
Continuous Quality Improvement (CQI) is a quality management process that encourages all health care team members to continuously ask the questions, “How are we doing?” and “Can we do it better?” (Edwards, 2008). To address these questions, a practice needs structured clinical and administrative data.
What is CQI and how does UE calculate it?
How does UE calculate CQI value? CQI stands for Channel Quality Indicator. As the name implies, it is an indicator carrying the information on how good/bad the communication channel quality is. This CQI is for HSDPA.
What is CQI in a CSI report?
Refer to CSI Overview page if you are not familiar with big picture of the CSI report. CQI stands for Channel Quality Indicator. As the name implies, it is an indicator carrying the information on how good/bad the communication channel quality is. This CQI is for HSDPA. (LTE also has CQI for its own purpose).
What if UE report low CQI even when channel quality is poor?
What if network sends a large transport block even though UE reports low CQI, it is highly probable that UE failed to decode it (cause CRC error on UE side) and UE send NACK to network and the network have to retransmit it which in turn cause waste of radio resources. What if UE report high CQI even when the real channel quality is poor?