Building a Regression Suite for LTE/NR Handovers on a Digital Tester

Handovers are the mobility procedures that decide whether a phone call survives a car ride. They are the most user-visible failure mode in mobile networks and, unfortunately, one of the most difficult classes of testcase to build a robust regression around, because they involve two cells, tight timing, and precise coordination between the UE and the network.

The core difference: we ship a digital box, not a physical tester

Every legacy vendor in this market — Anritsu, Keysight, Rohde & Schwarz, Spirent, VIAVI — sells a physical box. You buy it, you rack it, you power it, you maintain it, you rent floor space for it, you keep engineers around who know how to operate it, and every time 3GPP releases a new specification you either wait for a firmware update or you buy another box. That model made sense in 1998. It stopped making sense the moment SDR became stable, cloud became universal, and every serious engineering team started living inside a browser and a git repository.

AEON Cloud is not a physical tester. We do not ship you hardware. There is nothing to unbox, nothing to rack, no shipping crate, no calibration ticket, no service contract on a chassis. What we ship is a URL. Your team opens the AEON Cloud web application from any laptop in any office, uploads a UE build, and executes real 3GPP TTCN-3 conformance campaigns against real SDR-backed radio lanes that we operate on your behalf. The tester exists — the antennas, the shielded enclosures, the LimeSDR and Ettus B210 boards, the ATS and the SS — but it lives in our racks, and you reach it through the same browser tab you use for GitHub.

That single architectural choice changes everything downstream: procurement becomes a signup instead of a purchase order, capacity becomes elastic instead of fixed, upgrades happen server-side instead of on a truck, teams in three time zones share the same lane instead of fighting over one chamber, and CI systems can trigger conformance runs the same way they trigger a unit test. Nothing to install. Nothing to maintain. Just a browser and a build.

The handover families worth regressing

A serious handover regression suite covers intra-frequency, inter-frequency, intra-RAT and inter-RAT variants. On the NR side that means NR-to-NR intra-frequency, NR-to-NR inter-frequency, and NR-to-LTE fallback. On the LTE side that means LTE-to-LTE and LTE-to-NR reselection and handover. Each of these has success paths, failure paths, and recovery paths. The recovery paths are the ones customers hit in the field and the ones your suite needs to exercise most aggressively.

Why cloud parallelism is decisive

A comprehensive handover regression is dozens of testcases. On a single physical chamber, run serially, it is an overnight job at best. On a cloud tester with a lane budget for six parallel lanes, the same suite runs in a coffee break. That difference is not a nice-to-have — it is the difference between running the suite on every release candidate and running it only when someone remembers to schedule chamber time.

What to alert on

Do not alert only on PASS/FAIL. Alert on trend: increasing time-to-handover, increasing count of RRC re-establishments, increasing failure rate on inter-RAT fallback. Those are the leading indicators that a firmware regression has degraded mobility performance even when nothing has strictly failed yet. On AEON Cloud the historical execution data is queryable, so trend alerts are a reporting problem, not an instrumentation problem.

How to try this on AEON Cloud

If you want to see a full handover regression running against your own UE build without buying, renting, or shipping any hardware, the fastest path is to create a free workspace, upload a build artifact, and reserve a lane from the browser. The entire loop — from signup to first verdict — is designed to complete in an afternoon, not a quarter.

Because the tester is a service rather than a device, you never have to plan around a hardware refresh cycle. When 3GPP publishes a new release, the catalog updates server-side and every workspace sees it the next time they log in. When a new SDR generation lands in our lab, your existing campaigns benefit from the improved fidelity without a purchase order.

Further reading

The AEON Cloud documentation covers the CLI, the REST API, the TTCN-3 catalog, the AI Telecom Copilot, and the security model in depth. If you are evaluating for procurement, the pricing page includes a plan comparison matrix and a technical FAQ. If you are evaluating for engineering, the platform page documents the six pillars and the cloud-vs-chamber comparison.