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OpenAirInterface Tutorials

Are you looking for a flexible, open source 5G network emulator to study cellular networks? In this short tutorial, I will explain to you an open source emulator called oai. It is built with very basic radio components and PCs you can buy in the supermarket, so it is easy and convenient for students to start working in the next generation cellular system world. • Forget about simulators, even though they are pretty accurate If you plan to prototype a fully compliant 5G proof of concept is better to avoid any abstraction model of the cellular system, even though it is accurate, to reduce the time to the market from the prototype to the final design. • What is openairinterface? And Why is it interesting? Openarinterface is the commoditization of 3gpp radio systems and open source. Today is feasible to put fully compliant 4G or 5G entities such as eNB, gNBs, EPC and UEs into computers you can buy in the supermarket. Additionally, you can exploit CRAN experiments with functional splits standardized by NGFI, Small Cells Forum, and 3GPP associations. OAI wants to be a disruptive technology to challenge radio systems that vendors are planning to deploy with operators all over the world. • What is it the state of the art? There are some proprietary companies that offer 5g network emulators. From my perspective the best one is Keysight. They support release 15 real-time emulations with both, standalone a non-standalone use cases, complex 3D propagation channel models, handover, mmWaves and was selected by Qualcomm technologies to test 5G chips. That is amazing but, equipment is too expensive. The second option is Spirent that supports standalone a non-standalone use cases, handover, mmWaves, commercial off the shelf and up to 100 UEs, but it is expensive as well. Other solutions are Nettest that supports only standalone use case and commercial off the shelf User Ends. Valid8 that supports handover, the non-standalone use case. Viavi tm500 that supports mmWaves, handover, and commercial off the shelf hardware. The New York University build a 5g network emulator using national instruments hardware that supports mmWaves and founded Millilabs. Finally, Rohde Schwarz supports mmWaves using the CMW100, CMW500,CMP200, SMW200A and ATS1000 equipment. • What is the objective of this channel? The objective of this channel is to reduce frustration when people start working in openairinterface. OAI have good tools to visualize signals and channels such as the T-Tracer, the software oscilloscope (XFORMS), digital signals (gtkwave), network protocol analyzers such as Wireshark or ITTI analyzer and more, which help us to understand the system behavior. If you do not have a basic understanding of the protocol stack of the cellular network, you might go to study those concepts first. Sometimes, we could be tempted to run main emulators or unitary simulators without considering basic knowledge, however, that is not a good idea because oai tools may be not as intuitive as we expected. Finally, because of oai is built by a big community of operators, universities and vendors, there is not a document that explains in detail all the functions available. So, the learning curve is hard at the beginning, but time to time people will get familiar. Finally, do not forget that oai evolves to fast. At this moment oai is focused on working hard in the next generation of cellular network technology (New Radio and mmWaves) and probably some 4G developments will remain experimental.