[Openlte-discuss] Late DL/UL subframes and L's

[V P. <lc...@ou...>]

Hi all

I have done a lot of tests on OpenLTE lately, and experienced very poor performance on data traffic. Even just sending ping packets are difficult.

What I observe is:

1)  There are a lot of "error phy LTE_fdd_enb_phy.cc Late DL/UL subframe from MAC..." in the debug window.

2) There are a lot of L's in the application window.

I believe these errors are the reason for the poor performance on data traffic, is this correct? And my question is what are the reason for 1) and 2), and are they related in anyway to each other?

"Late DL subframe" is due late scheduling for DL packets from MAC to PHY, but what is actually "Late UL subframe"? From the source code, i.e. LTE_fdd_enb_phy.cc, the "Late UL subrame" is occuring inside the handle_phy_schedule function, which handles downlink traffic, is this correct?

Hope someone can shed light on these questions.

Best regards

Pham