OFDMA Uplink Support in 5G‑LENA

[Bara Sabbah]

Hello everyone,

I am currently working on my master thesis using the 5G‑LENA. As far as I understand, the current implementation only supports TDMA in the uplink. For my work, I would need to implement OFDMA uplink scheduling.

I would like to ask:

• Is there any ongoing work or plan to add OFDMA uplink support in 5G‑LENA?

• If not, I would greatly appreciate any guidance or recommendations on the most effective and straightforward approach to implementing OFDMA uplink on my own

Any guidance  would be greatly appreciated, and thanks in advance.

Best regards,
Bara Sabbah

[Kent Huns]

Hi Bara,

The functions you mentioned are here. Please read them carefully, and you’ll see AssignULRBG() is the process for RBs allocation.

model/nr-mac-scheduler-ns3.cc

uint8_t

NrMacSchedulerNs3::DoScheduleUlData()

model/nr-mac-scheduler-ofdma.cc

NrMacSchedulerNs3::BeamSymbolMap

NrMacSchedulerOfdma::AssignULRBG()

std::shared_ptr<DciInfoElementTdma>

NrMacSchedulerOfdma::CreateUlDci()

    std::shared_ptr<DciInfoElementTdma> dci =

        std::make_shared<DciInfoElementTdma>(ueInfo->m_rnti,

                                             DciInfoElementTdma::UL,

                                             spoint->m_sym - maxSym,

                                             maxSym,

                                             ueInfo->m_ulMcs,

                                             ueInfo->m_ulRank,

                                             ueInfo->m_ulPrecMats,

                                             tbs,

                                             1,

                                             0,

                                             DciInfoElementTdma::DATA,

                                             GetBwpId(),

                                             GetTpc());

    dci->m_rbgBitmask = std::move(rbgBitmask);

5G-LENA follows Allocation Type 0, so resource blocks are grouped into RBG and the allocation is represented as a bitmap.

First, check if dci->m_rbgbitmask is written as you expect.

https://www.sharetechnote.com/html/5G/5G_ResourceAllocationType.html

Thanks

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[Bara Sabbah]

Hi Kent,

thanks a lot for your response. I checked the functions, and it looks to me like OFDMA in the UL is actually implemented (contrary to what the documentation states). Resources in time (symbols) as well as in frequency (RBGs) appear to be allocated to the UEs.

Am I missing something, or is the documentation simply not up to date?

Best regards,
Bara