5G-LEO - OpenAirInterface™ extension for #5g #satellite links


Objectives-5G-LEO aims to accelerate the development of OAI as an open-source tool allowing the exchange & comparison of 5G NTN results by the SatCom community & facilitating the collaboration in R&D activities. The extended OAI software library is seen as an important instrument to develop early prototypes for validating key 5G NTN design aspects & providing prompt feedback to the 3GPP standardization process. The main objectives of the 5G-LEO project are the following:

Review the reference scenarios & use cases identified for NR-NTN system deployments by 3GPP & selection of a 5G LEO baseline scenario to be implemented & verified with the extended OAI library.

Identification of the fundamental gaps & changes needed in the code base for properly extending OAI for the 5G LEO baseline scenario.

Implementation of the required OAI code adaptations for the different layers of the 3GPP protocol stack to support 5G LEO & closely following the developments in 3GPP standardization for 5G-NTN within Rel-17 & Rel-18.

Set-up an end-to-end 5G LEO demonstrator in the lab for experimental validation of the OAI extension for the 5G-LEO baseline scenario.

Benefits- 5G-LEO helps the prototyping of and experimentation with 5G LEO communication networks closely following the 3GPP Work Item on NTN and thus supporting the evolution of the 5G New Radio standard regarding NTN.

Features-The 5G-LEO solution is characterised:
An important concept of 5G-LEO is to evolve an existing open-source software implementation platform, the OpenAirInterface™, which has a very considerable supporting community.

The main feature of the 5G-LEO platform is that it enables end-to-end testing & performance verification of 5G direct access adapted to Low Earth Orbit satellite systems using an emulator environment;

Further important features include the mitigation of satellite RF impairments of the 5G signal as part of the implementation, in combination with the handling of considerable Doppler shift & handover rates through the compensation at the different layers of the protocol stack at the 5G NR UE & gNB.

System Architecture-The base-band processing of the OAi open-source software stack for gNB & UEs is performed on standard multi-core PCs, which are connected to commercial SDR transceivers, USRPs from National Instruments.

On the network side the IF interface between 1 & 6 GHz is connected to the satellite-enabled channel emulator that is capable to emulate LEO satellites. On the UE side the IF interfaces are connected to the channel emulator as well. The functionalities are tested for real-time effects (timing relationships in radio layer, effects by hardware configuration, performance evaluation regarding RF effects like large Doppler shift, delay drifts etc.). The setup with gNB, UEs & 5G CN OAI is designed for later operation over real satellite links.

For details https://lnkd.in/gf-wDJpp

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