Description
How can the CQI (Chanel Quality Identifier) from UE and coresponding 3GPP specified mapping to Modulation and TBS be tested?
CQI (Chanel Quality Identifier) report from UE and coresponding mapping of Modulation and TBS tests on CMW500 / CMW290
Resolution:
- Setup the LTE Signaling cell to a high RS EPRE level so that there is a good reception level on the UE.
- Configure "CQI-PMI-RI" and "Follo2 CQI (TM1..9)" as scheduling type.
- To follow the 3GPP modulation sceem and TBS size mapping tabel that corresponse with the reported CQI value from the UE Table-Mod /TBSI has to be set to "Acc. to 3GPP"".
- Enable UE Measurement Report
- Switch the LTE Signaling Cell
- After UE has attached press "Connect" softkey to establish a connection
- Start LTE RX Measrument and select "CQI Reporting" via the Select View soft key
When the signal quality is good the UE will report CQI = 15 and will use maximum TBS and highest supported Modulation:
When the the signal quality went down (reduction of RS EPRE level) the UE will report lower CQI value and CMW reduced TBS and downgrade the used Modulation:
