Jari Nurminen

Jari has over 20 years of experience in software development, test automation and telecommunications. His expertise includes delivering Telecom and ICT solutions to major European carriers. As Chief Technology Officer (CTO), Jari leads the operation for the whole Automatic Test Framework ecosystem and the R&D department at Segron.
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Recent Posts

3 Tips for Improved Telecom Lab Testing

Jan 21, 2020 3:00:00 PM / by Jari Nurminen posted in Automation, Device Testing

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For the best possible results, your test lab needs to make use of the absolute latest in cutting edge technology. Because this is the arena in which you test changes and additions to your network—including new connected devices like the internet of things (IoT)—you need to find a way to replicate existing network conditions as closely as possible. Otherwise, you might test out new service offerings or network adjustments in a lab setting only to find that your service doesn’t work correctly under real life conditions—which could result in costly delays, outages, and potential subscriber churn.

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How To: Regression Testing for MVNO

Jan 2, 2020 3:00:00 PM / by Jari Nurminen posted in 24/7 Regression, End-to-End Testing

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MVNOs (mobile virtual network operators) sometimes get a bad rap. This isn’t entirely without reason: A recent report found that MVNO download speeds across the U.S. are 23% worse than those of their host networks on average. While download speeds for MVNO often could reach the same heights as their host networks, they tended to offer those speeds less consistently, leading to lower “consistent quality scores” in terms of meeting minimum speeds and staying below allowable levels of jitter, latency, and packet loss.

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5 Ways Telecoms Can Increase Test Velocity

Dec 19, 2019 9:00:00 AM / by Jari Nurminen posted in Time to Market, Automation ROI

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Let’s say you’re migrating all of your subscribers to a highly redundant HSS database. You know it’s going to be a long process, but you want to set an ambitious deadline and perform the migration before your next quarterly all-hands meeting. As such, you put together a list of the things that are most likely to cause delays. And what should be at the top of that list? Depending on how your current test operations function, service verification could be your prime suspect.

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Case Study: PCRF Regression Testing

Dec 5, 2019 3:00:00 PM / by Jari Nurminen posted in Customer Experience, 24/7 Regression, Automation ROI

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Way back in the day, if you were on the go and needed to make a phone call, you kept your eyes peeled for the nearest payphone. You would drop in your coins and the operator would connect you to your desired call recipient. After the time you paid for had run out, a live operator would butt in and let you know that in order to extend your call you needed to add more money. Today, the idea of something like this happening during a VoLTE call seems a little bit absurd—but in point of fact it represents a need that all telco operators still grapple with: real-time provisioning of services based on what the user has actually paid for.

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The Pros and Cons of Keyword Based Testing

Dec 3, 2019 3:00:00 PM / by Jari Nurminen posted in Automation, Automation ROI

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Let’s say you have a small system whose functionality you want to test, and you determine that there are five distinct use cases that require verification. As a technically-adept test engineer with a fair amount of programming skill, what do you do? In all likelihood, you simply script up each test case individually, so that for each use case there’s a unique piece of code that needs to run in order to make sure that everything is working smoothly. This makes sense, and as test automation has become more common (in some sectors, anyway), we've seen a lot more people doing just that. For a limited number of test cases, this is probably the smart thing to do. But what happens when it’s not half a dozen use cases that require scripting, but hundreds or thousands?

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How To: Mobility Management

Nov 21, 2019 9:00:00 AM / by Jari Nurminen posted in Customer Experience, End-to-End Testing

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In the US right now, Verizon and T-Mobile are battling it out for who can provide the most extensive LTE coverage. And as of OpenSignal’s 2018 report, the two were in a statistical tie—each was able to provide an LTE signal 93.7% of the time. These are historic highs for the companies, and objectively impressive numbers, but that still means that they’re failing to provide an LTE signal fully one-twentieth of the time. As such, SRVCC (Single Radio Voice Call Continuity) would still be critical to providing high quality of service (QoS). Why? Because right now it’s the standard solution for ensuring mid-call handovers from all-IP LTE networks to circuit-switched call bearer 2G/3G networks.

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Legacy Telephony: the Importance of Backward Compatibility

Nov 12, 2019 9:00:00 AM / by Jari Nurminen posted in Automation, Customer Experience, 24/7 Regression

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Backward compatibility is a noble goal for any communication system. For telecom networks in particular, it's an important part of providing seamless coverage across legacy platforms, which means you can keep customers happy without forcing them to upgrade their service constantly. By placing an emphasis on service in this way, you can help protect revenue over time. That said, ensuring legacy integration can often provide challenges for operators.  

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How To: Enterprise Mobility Testing

Nov 7, 2019 3:00:00 PM / by Jari Nurminen posted in Automation

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One of the most significant ways in which the rise of mobile phones and laptops has changed the business world is encouraging a tremendous increase in mobility. Not only are employees at many businesses able to telecommute more easily than ever before, folks traveling for business are able to stay connected so effectively that it can feel like they’ve never left the office at all. For obvious reasons, this makes life easier and more pleasant for a lot of folks, all while helping to make truly global enterprises more connected than ever. The cost of this increased freedom, however, is a subsequent increase in complexity for telco operators.

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Can Robots Speed Up End-to-End Testing?

Oct 8, 2019 3:00:00 PM / by Jari Nurminen posted in Automation ROI, End-to-End Testing

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End-to-end testing: for many telco operators it’s the holy grail of service verification, but it can also be a slow, laborious process that adversely impacts time to market. Even if you’ve managed to automate your relevant equipment and collect success and failure data from the relevant end-points, you might still find yourself in a position where hard-to-read data and hard-to-program use cases stop your end-to-end tests from running as quickly as you would like. When this happens, you’re in the uncomfortable position of either sacrificing high levels of test coverage by cutting the test off early, or delaying your network migration or device rollout to accommodate slow testing.

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How To: Verifying Roaming Service

Oct 1, 2019 3:00:00 PM / by Jari Nurminen posted in Automation, End-to-End Testing

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One of the top goals that every telecom operator aspires to is consistent service, and a big part of that consistency is tied to how well you can coordinate with other networks to offer high quality roaming service for your customers. Perhaps more so than in the past, users don’t want to comb through a lot of fine print about where their in-network coverage begins and ends—they simply want to be able to use Gmail while they’re out and about in the world without experiencing any glitches or service anomalies.

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