[srslte-users] Bug with PUSCH (Collision) in srsENB

[Andre Puschmann]

Thanks for reporting this. We'll look into it.

On 16/11/18 9:58, Ilshat Shaidullin wrote:
> Hello SRS Team,
> 
> I've noticed strange behavior in srsENB. It occurs when I connect 2 UEs. 
> I've attached log files (info level for phy, mac and rrc).
>  
> Let the 1st UE be A and the 2nd UE be B. 
> [FirstExample.log] I successfully connect A with rnti=0x46. Then I try
> to connect B with rnti=0x47. But after eNB sends RRCConnectionSetup all
> UL transmissions of B are always KO (though SNR is good). B can be
> successfully connected only with next rnti (0x48).  
> 
> [SecondExample.log] I successfully connect B with rnti=0x46. Then I
> successfully connect A with rnti=0x47. But as soon as A is connected, 
> B's UL transmissions are always KO (though SNR is good). So after some
> time B will perform RACH and connect with new rnti. Only after that B's
> UL transmissions will be OK.
> 
> 
> I think that in the examples above when eNB sends DCI Format 0 for B, A
> mistakenly uses it and performs UL transmission too. This may happen
> because C-RNTI values are close to each other. If I change C-RNTI
> allocation method ( replace "last_rnti++"  with "last_rnti += 10" in MAC
> ) I don't observe this issue.
> 
> What can cause such strange behavior?
> 
> 
> Best regards,
> Ilshat 
> 
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