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Overview of Functional Splits in OAI Raymond Knopp Communication Systems Department EURECOM Unleashing the potential of open-source in the 5G arena

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  • Overview of Functional Splits in OAI

    Raymond Knopp

    Communication Systems Department

    EURECOM

    Unleashing the potential of open-source in the 5G arena

  • Considered RAN Splits in 3GPP evolution

    Fronthaul/Midhaul

    – Lowlatency FH

    – Highlatency FH

    Central Unit

    (CU)

    PDCP

    LTE-PHY

    Radio

    LTE-RLC

    LTE-MAC

    LTE-PHY

    5G-RLC

    5G-MAC

    5G-PHY

    5G-PHY

    Radio

    5G-RLC

    5G-MAC

    5G-PHY

    5G CORE

    Low latency FH Split

    < 20km

    LTE-RLC

    LTE-MAC

    LTE-PHY

    WIFI

    MAC

    WIFI

    PHY

    RRC

    AMF

    High capacity Backhaul Capacity-Limited Backhaul

    AMF MEC

    Overview of OAI Functional Splits

    Distributed

    Unit (DU)

    UDM AUSF

    UPF

    UPF

    htpp://www.eurecom.fr/

  • Small-Cell Forum

    Overview of OAI Functional Splits

    htpp://www.eurecom.fr/

  • Current vRAN Roadmap in OAI

    Overview of OAI Functional Splits

    NFAPI

    NFAPI

    htpp://www.eurecom.fr/

  • OAI splits (NGFI Numbering)

    Overview of OAI Functional Splits

    Current OAI implementation (RRU/RAU/RCC)

    supports either

    • IF5 time-domain fronthaul (> 1 GbE required)

    • IF4.5 split (FFTs) (280 Mbit/s/antenna port

    fronthaul – 20 MHz carrier) per carrier/sector

    • IF1’ = 3GPP F1-U/C under development • IF2 via Cisco open-nfapi

    htpp://www.eurecom.fr/

  • RAN Node Configurations

    Overview of OAI Functional Splits

    htpp://www.eurecom.fr/

  • RAN Node Configurations

    Overview of OAI Functional Splits

    3GPP CU SCF VNF

    3GPP

    F1-C/F1-U

    3GPP DU

    htpp://www.eurecom.fr/

  • RAN Node Configurations

    Overview of OAI Functional Splits

    SCF PNF

    htpp://www.eurecom.fr/

  • OAI FRONTHAUL

    (c) Eurecom 2017

    htpp://www.eurecom.fr/

  • RRU / RAU Negotiation

    (c) Eurecom 2017

    htpp://www.eurecom.fr/

  • RU/RAU Data plane

    (c) Eurecom 2017

    htpp://www.eurecom.fr/

  • RU IF4p5 Procedures in RRU

    (c) Eurecom 2017

    htpp://www.eurecom.fr/

  • RU IF4p5 Procedures (in RAU)

    (c) Eurecom 2017

    htpp://www.eurecom.fr/

  • CU/DU split in OAI (F1-interface)

    Community development

    – with 5GPPP 5GPicture project : UThessaly/EURECOM

    – Chinese partners (China Mobile, BUPT)

    Target OPNFV VCO demonstrator

    – with RedHat/Quortus(vEPC)

    LTE vs. NR

    – F1 is specified for NR and needs to be retrofitted (minor) to

    support LTE

    – OAI will have F1 support for both

    Overview of OAI Functional Splits

    htpp://www.eurecom.fr/

  • Prototype RRU (2.6 GHz/3.5 GHz TDD)

    POE

    Antenna

    10 MHz ref

    1GbE

    5V

    PA/LNA/Switch

    Overview of OAI Functional Splits

    htpp://www.eurecom.fr/

  • QUESTIONS

    Overview of OAI Functional Splits

    htpp://www.eurecom.fr/