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12) End-to-end system testing of
Mavenir O-DU with MTI mobile O-RU
(remote testing)

Companies Participating
in this Scenario

Mavenir provided the software of the LTE O-CU/O-DU, and Polaris EPC emulator and Oneplus-6T test UE

MTI provided the hardware and software of the LTE O-RU

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Testbed setup

The connection details of the hardware in the lab are in the network topology diagram below.

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Device Under Test
HW Kontron server (O-DU)+ SW Mavenir

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Dell R740 server (O-CU)+ SW Mavenir

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  • CU Software
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  • Platform
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  • Server
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  • Mavenir DU SW functional specification:
  • DU covers all the functional blocks of High-PHY module
    as per the O-RAN spec such as
  • Scrambling
  • Modulation
  • Layer mapping
  • Precoding
  • RE mapping

Test scenarios introduction

O-DU + O-RU using
ITU-T G.8275.1 profile (LLS-C3)

The purpose of this test is to validate that both the Mavenir O-CU/O-DU and MTI O-RU are
synchronizing from a common PRTC using the ITU-T G.8275.1 profile.

Radio Layer 3 C-Plane establishment
and Initial Radio U-plane data transfer

The purpose of this test is to validate the essential radio operation of Radio Layer C-Plane establishment
and initial Radio U-plane data transfer on a system level with the integration of O-DU and O-RU from
different vendors.

Radio U-plane downlink
data transfer (Downlink throughput performance)

The purpose of this test is to validate key radio operation after Radio Layer C-Plane establishment
and initial Radio U-plane data transfer, the Radio U-plane data transfer including Downlink throughput
performance on a system level with the integration of O-DU and O-RU from different vendors.

Radio U-plane uplink data transfer
(Uplink throughput performance)

The purpose of this test is to validate key radio operation after Radio Layer 3 C-Plane establishment and
initial Radio U-plane data transfer, the Radio U-plane data transfer including Uplink throughput
performance on a system level with the integration of O-DU and O-RU from different vendors.

Radio U-plane data transfer
(bidirectional throughput performance)

The purpose of this test is to validate key radio operation after Radio Layer 3 C-Plane
establishment and initial Radio U-plane data transfer, the Radio U-plane data transfer
including bi-directional throughput performance on a system level with the integration
of O-DU and O-RU from different vendors.

Delay Management #1
Minimum fronthaul latency

The purpose of this test is to validate that correct timing is achieved on the air interface
regardless of the actual fronthaul latency and O-RU processing time.

Delay Management #3
Normal fronthaul latency

The purpose of this test is to validate that correct timing is achieved on the air
interface regardless of the actual fronthaul latency and O-RU processing time.

Testing Results/Summary

In the tests, MTI O-RU connects over O-RAN Fronthaul 7-2x split (CAT A) to Mavenir O-DU/O-CU. The first scenario focuses on O-DU running as Slave Clock and a PTP Master Clock device connects to Mavenir O-DU/O-CU and the stimulus for the O-DU (DUT). Retrieved sync status of the O-DU is inline with the O-RAN standards.

Most of the Mavenir tests are focused on the C/U-Plane establishment and the End-to-End traffic test. From the pcap captured on fronthaul and the screenshots of the Real UE logs, the layer 3 C-plane establishment is successful and the measured throughout is the same as the generated traffic for both downlink and uplink.

Benefits for the Industry

  • The End-to-End interoperability of O-RU/O-CU/O-DU validated with MTI and Mavenir solution.
  • The multivendor solution validated in the case of O-RAN Fronthaul 7-2x split (CAT A).