Operation Mode FDD/TDD

[Daniel Rodrigues de Luna]

Hi all,

I faced a problem regarding the operation mode (FDD) in 5G-LENA. I am trying to simulate the 3GPP band n28 (FDD), which operates in uplink at 703 MHz – 748 MHz and downlink at 758 MHz – 803 MHz.

I created 2 CCs with 1 BWPs each, one for downlink and another for uplink with operation modes "DL|DL|DL|DL|DL|DL|DL|DL|DL|DL|" and "UL|UL|UL|UL|UL|UL|UL|UL|UL|UL|", respectively, following what the Release 15 says. Howerver, I got the message (attached).

As far as I understand, the uplink signalling should be made at the uplink BWP, and the downlink signalling should be made at the DL BWP. However, it needs a slot in the opposite direction to deal with the crtl traffic in the first BWP of each CC. Is my evaluation is correct? If so, is there a workaround? Could I solve this problem if I just set 1 CC with 2 BWPs?

Note that if the UL BWP has em DL slot and DL BWP has a UL slot, I am not simulation a fully FDD system. 

Thanks for any help with this. Best regards

[Katerina Koutlia]

Hi Daniel,

Yes you are right, you will solve this problem by configuring 1 CC and 2 BWPs and link these 2 BWPs.

You can have a look at the examples cttc-lte-ca-demo and cttc-nr-notching where FDD is also configured.

Notice that the linking of the 2 BWPs must be done both at gnb and ue side:

// Link the two FDD BWPs:

          nrHelper->GetBwpManagerGnb (enbNetDev.Get (i))->SetOutputLink (1, 0);
...

// Set the UE routing:
      for (uint32_t i = 0; i < ueNetDev.GetN (); i++)
        {
          nrHelper->GetBwpManagerUe (ueNetDev.Get (i))->SetOutputLink (0, 1);
        }

BR,

Kat

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[Daniel Rodrigues de Luna]

Hi Kat,

Thank you for your answer and for your time.

Regards,