I have one question in LTE.
How we will know whether HARQ use is Chase Combining or Incremental Combining in MAC layer during RLC ACK/NACK?
In logs or in parameter dump?
As for example oss command or something like that…
Because chase combining will increase too much retx and bler and incremental too has some types where only retransmitted packets should be used to reduce bler.
But how can we indentify either in logs, kpi or oss command?
I feel Layer 2 is more interesting than Layer 3, as everything is deal by MAC as transporter to lower and upper layer where in RF we rarely see.
Obviously RRC is main connection, but MAC is main transporter to both layer lower and uper.
And MAC is toughest part to study. And understand.
Every protocol is important, but MAC is toughest part.
Protocol industry doesn’t give importance to RF Optimisation, because we are associated with lower and uper layer knowledge.
Layer 2 is kind of bouncher to us and we stuck there.
As RF is left with no scope.
If Huawei, then getting into Ericsson is tough.
If Ericsson, geting into other vendors is tough.
UE testing sees a good future as 3gpp won’t change.