User Guide

Chapter 8: Monitoring 16
• cqi is the Channel Quality Indicator reported by the UE, between 0 (bad) and 15 (very
good). If there are several aggregated DL cells, the minimum cqi is displayed.
• ri is the Rank Indicator (number of layers for MIMO). If there are several aggregated DL
cells, the minimum rank indicator is displayed.
• mcs (Modulation Coding Scheme) is the average MCS value used in downlink during the
measurement interval period. More details about MCS range are available in 3GPP TS
36.213
• retx (retransmission) is the number of retransmission sent by UE in Uplink or received by
eNodeB in downlink. This parameter gives indications about the channel quality.
• txok is the number of successfully transmitted transport blocks.
• brate is the average bitrate (at the MAC layer), in bits per second.
Where for uplink:
• snr is the measured Signal to Noise Ratio for the uplink from the PUSCH reference signals
and the SRS.
• puc1 is the measured Signal to Noise Ratio for the last PUCCH1.
• rxko is the number of received uplink transport blocks with CRC errors.
• rxok is the number of received uplink transport blocks without CRC error.
• turbo gives the minimum, average and maximum number of iterations of the turbo decoder.
• phr is the content of the last Power Headroom MAC control element sent by the UE. It is
expressed in dB. Negative values indicate that the UE could not transmit with the required
power.
• pl is the Uplink Path Loss in dB. It is measured from the reported PHR and the measured
uplink power level. It is meaningful only if the RF interface correctly reports the absolute
received power level.
• ta is the Average of the uplink timing advance measured for the UE in TA units.
8.2.2 t spl command
Once UE got attached to the cell, Uplink and Downlink signal levels have a direct impact on
decoding performances. In order to reach full throughput in both ways, TX and RX antenna
gain values must be set correctly (as described in section "TX/RX gain setting") in order to
avoid saturation when set too high or Bler when set too low. The command t spl under eNB
terminal helps to monitor the RX and TX signal power:
(enb) t spl
Press [return] to stop the trace
--TX 1----------- --TX 2----------- dBFS --RX 1----- --RX 2-----
RMS PAPR MAX RMS PAPR MAX SAT RMS MAX RMS MAX
-24.6 17.0 -7.7 -24.6 17.5 -8.3 0 -42.7 -30.4 -42.7 -30.4
-24.6 17.0 -7.7 -24.6 17.5 -8.4 0 -42.7 -30.5 -42.7 -29.7
-24.6 17.0 -7.7 -24.6 17.5 -7.9 0 -42.7 -30.2 -42.7 -29.8
-24.6 17.0 -7.7 -24.6 17.5 -8.4 0 -42.7 -30.4 -42.6 -29.7
-24.6 17.0 -7.7 -24.6 17.5 -8.4 0 -42.7 -30.8 -42.7 -30.2
-24.6 17.0 -7.7 -24.6 17.5 -8.4 0 -42.7 -30.4 -42.7 -30.5
-24.6 17.4 -7.2 -24.6 17.5 -8.3 0 -42.7 -30.7 -42.7 -30.5
TX columns provides information about transmitted signal power.
• TX RMS: stands for transmitted Root-Mean-Square. This is the mean value in dB FS (full
Scale)