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

[Tomcsányi D. <do...@to...>]

Hi Pham,

Hm, that is weird. In that case I guess we need to wait until Ben or someone else chimes in with their opinion.
I use a software called srsUE which is partially based on openLTE and experience the same kind of "late"s, so if there is a fix for that it would be great.

Cheers,
Domi

> 2017. nov. 9. dátummal, 19:51 időpontban V Pham <lc...@ou...> írta:
> 
> Hi Domi.
> 
> I am aware of the importance of CPU and PC power, and like you said, in general, SDR related SWs do need a lot of CPU power. 
> 
> However I have used the same laptop with i7 cpu to successfully run OAI, and achieved much higher data traffic throughput than in the case of OpenLTE.
> 
> I believe there may be some logical issues with the openLTE code causing all these L's and Late DL/UL subframes from MAC to PHY. 
> 
> More discussions on this topic is appreciated
> 
> Fra: Tomcsányi, Domonkos <do...@to...>
> Sendt: 9. november 2017 19:19
> Til: V Pham
> Emne: Re: [Openlte-discuss] Late DL/UL subframes and L's
>  
> Hi,
> 
> This is usually related to not enough powerful hardware.
> 
> Cheers, 
> Domi
> 
> 
> 
> 2017. nov. 9. dátummal, 10:34 időpontban V Pham <lc...@ou... <mailto:lc...@ou...>> írta:
> 
>> 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 <http://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 <http://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
>> 
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