LTE Device Testing

AMARI Callbox Series for lte device testing

Bring your LTE device tests into the lab.

Develop and debug LTE modems, smartphones, routers and connected products with the AMARI Callbox Series. Configure an eNodeB, EPC and IMS in one platform, then follow the device from network attach to data traffic and voice calls.

LTE FDD and TDD · Carrier aggregation · MIMO · VoLTE · Mobility

Discuss your LTE test setup

Start with a working LTE connection.

Attach and data connectivity

Check cell selection, authentication, LTE attach and default bearer establishment. Configure subscriber credentials and APNs, then run IPv4 or IPv6 traffic between the device and your application.

FDD and TDD configurations

Select the LTE band, carrier bandwidth and duplex mode supported by your device and Callbox hardware. Start from a supplied configuration and change one parameter at a time to reproduce the network conditions you need.

Build your LTE test plan.

Carrier aggregation and throughput

Configure primary and secondary LTE cells, check the band combinations reported by the device and observe secondary-cell activation. Compare uplink and downlink traffic across supported carrier combinations.

MIMO and radio behaviour

Explore supported LTE transmission modes and 2x2 or 4x4 MIMO configurations. Inspect CQI reports, modulation, retransmissions and throughput while changing the radio setup. Antenna paths and available layers depend on the chosen model.

VoLTE and IMS services

Use the embedded IMS for registration, VoLTE calls and SMS testing. Start with an audio loopback call and review SIP alongside LTE signalling to investigate call setup and release.

Mobility and connection recovery

Configure neighbouring cells and exercise reselection, handover and recovery after coverage loss. Intra-eNodeB handover uses multiple cells within one RAN instance; inter-eNodeB scenarios need two RAN instances.

Network sharing and dual SIM

Test LTE MOCN configurations with multiple PLMNs. For DSDS or DSDA devices, use suitable separate network configurations and SIM credentials to investigate paging, calls and data activity across the subscriptions.

Feature and regression testing

Extend validation to CMAS alerts, aperiodic CSI reporting and device behaviour under configured error cases. Save the scenario and repeat it after firmware changes, comparing signalling and application results.

Configure, inspect and automate.

Prepare a baseline

Use the supplied configuration files to establish a known working connection. Keep a copy, adapt the radio and core settings, and record the software version and device firmware.

Find the cause in the logs

Inspect RRC and NAS messages, radio statistics and IMS signalling in the WebGUI. Correlate the protocol exchanges with the failed connection, data transfer or call.

Repeat the same scenario

Use the WebSocket API to control supported network parameters, retrieve statistics and coordinate repeatable test sequences with your device and traffic tools.

Choose the resources your test needs.

Size the setup around the complete test: simultaneous cells, carrier aggregation, MIMO and any LTE/NR combination.

Model	Suggested use
AMARI Callbox Mini	Single-cell LTE development. An example configuration is one 20 MHz LTE cell with 2x2 MIMO.
AMARI Callbox Classic	LTE-focused multi-cell and carrier-aggregation tests. An example configuration is three 20 MHz LTE cells with 2x2 MIMO.
AMARI Callbox Advanced	LTE tests requiring additional antenna resources, including 4x4 MIMO, or a combined LTE and NR test plan.
AMARI Callbox Ultimate	More radio resources for multi-carrier LTE, mobility and mixed LTE/NR configurations.
AMARI Callbox Extreme	Larger test configurations combining multiple carriers, antenna paths and technologies.
AMARI Callbox Elite	Two eNB/gNB instances and up to two core networks for separate-network and inter-node scenarios, including dual-SIM tests.

The examples are alternative configurations, not capacities that can be added together. A single-cell Mini does not provide multi-cell carrier aggregation or handover on its own. Compare Callbox configurations.

Hardware, software and test setup.

Included in the platform

The Callbox combines LTE RAN, EPC, IMS, protocol logging and remote APIs. Five test SIM cards are supplied; configure the matching subscriber credentials for your device.

RF and measurement setup

Connect through a conducted RF path with suitable attenuation, or a controlled radiated setup. Add the RF accessories your device needs and an external power analyser if current or energy measurements are part of the test.

Resources for advanced tests

Match carrier aggregation and MIMO to the UE capabilities and available radio resources. Inter-eNodeB testing requires two Callboxes or the two RAN instances of a Callbox Elite.

Three ways to start.

Illustrative lab setups to adapt to your device and test plan.

Example A · LTE connection and application

LTE device + test SIM + single-cell Callbox configuration. Check attach and IP connectivity, run your application, then vary APN and radio settings while reviewing the logs.

Example B · Carrier aggregation and firmware comparison

CA-capable device + compatible multi-cell Callbox + suitable RF connections. Establish a single-carrier baseline, add a supported secondary carrier and compare throughput and signalling across firmware versions.

Example C · VoLTE and mobility

VoLTE-capable device + test SIM + IMS-enabled multi-cell setup. Establish an audio loopback call, trigger the selected handover procedure and inspect call continuity, SIP and RRC messages.

Before you configure your lab.

Can I test LTE-M, NB-IoT or satellite connectivity?

See IoT device testing for LTE-M and NB-IoT, and NTN device testing for satellite and LTE direct-to-cell scenarios.

Can the same setup support a move to 5G?

The Callbox range also supports NR. Select the bandwidth, antenna paths and simultaneous cells needed for 5G SA or NSA device testing; NSA requires both LTE and NR resources.

Tell us what your LTE device needs to do.

Share your device model, bands, carrier combinations, MIMO requirements and target scenarios. Our team can match a Callbox configuration to your connectivity, voice, mobility and automation needs.