[srslte-users] Reagrding Ideal eNB Metrics

[Saimanoj Katta]

Hi all,

I am using the srsLTE eNB code with USRP X310 to connect to a commercial
EPC and COTS UE. I was looking at this link
<https://github.com/srsLTE/srsLTE_docs/blob/master/srslte_user_manuals/source/srsenb/source/2_enb_getstarted.rst>
where the following metrics are given as an example:

RACH:  tti=3381, preamble=3, offset=1, temp_crnti=0x46
User 0x46 connected

------DL------------------------------UL----------------------------------
rnti  cqi    ri   mcs  brate   bler   snr   phr   mcs  brate   bler    bsr
46   14.1   2.0  25.1  28.4M   0.8%  24.8   0.0  23.1  9.60M   2.2%   140k
46   14.8   2.0  26.6  30.7M     0%  24.9   0.0  23.2  9.92M     0%   140k
46   14.7   2.0  26.3  30.1M   0.8%  24.9   0.0  23.1  9.90M     0%   140k
46   14.8   2.0  26.5  30.6M     0%  24.9   0.0  23.1  9.90M     0%   140k
46   15.0   2.0  26.7  30.9M     0%  24.8   0.0  23.1  9.83M     0%   140k
46   14.5   2.0  26.1  30.0M     0%  24.9   0.0  23.1  9.88M     0%   140k
46   14.8   2.0  26.3  30.3M     0%  24.8   0.0  23.1  9.84M     0%   140k
46   14.7   2.0  26.4  30.4M     0%  24.9   0.0  23.1  9.89M     0%   140k
46   14.7   2.0  26.4  30.4M     0%  24.9   0.0  23.2  9.91M     0%   140k
46   14.7   2.0  26.3  30.4M     0%  24.9   0.0  23.1  9.87M     0%   140k
46   14.8   2.0  26.4  30.4M     0%  24.9   0.0  23.1  9.88M     0%   140k

In my case, these are the values:
ri=0 (My Rx antenna and Rx/Tx antenna are perpendicular to each other)
mcs(DL)= tends to be around 0.1 ( I read this is generated automatically,
so I can't tweak them, based on the radio conditions)
brate=tends to be around 100 (In my understanding, bit rate depends on MCS
and/or channel coding rate)
bler is fine in both UL/DL.
snr is 6-15
phr 21-24
mcs(UL)= 1-12
brate= 1k- 22k
bsr=0

I also tried changing the rx_gain and tx_gain.These values are no where
close to mine. How do I change/fine tune parameters so as to get similar
ones and form a stable connection. I have attached my eNB log file and the
metrics file as reference. Any leads/suggestions will be appreciated.

Regards,
Saimanoj
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