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2G, 3G and 4G Core testing

2G, 3G and 4G Core testing

Polystar Solver offers simulator products for load generation, stress and feature testing for Mobile Core (CS-, PS-, EPC- and IMS-Core) with voice and data together with signalling. Solver supports 2G, 3G and 4G Core testing for next generation telecommunications networks.

Customers would use simulators
Would you risk to run services in live network without a proven test program? Verify the services before going live

What is in for you?
Faster to market, better quality, proven interoperability, minimize downtime or any major problem in the network.

Why to implement VoLTE?
Explosive demand combined with increasing price pressure and competition from OTT players are driving the evolution to LTE, which opens up new business opportunities for operators and helps them improve the customer experience.

What are the key advantages of VoLTE?
VoLTE supports higher spectral efficiency, OPEX savings from consolidation and optimization, better voice call quality, and new opportunities for more sophisticated voice-based services.

What are the main approaches to implementing VoLTE?
Operators can implement full IMS VoLTE and multimedia (VoLTE with SRVCC), start with CSFB for voice and IMS for multimedia, or rely on CSFB over the longer term and target LTE for data (like most operators will do in the first implementation round).

Supported interfaces:    Iu-CS, Iu-PS, A, Ater, Gb, SIP/SIP-I/SIP-T(Mb, Gm), ISUP, S1-U, S1-MME, S11, SGi..

Voice codec support:    AMR, AMR-WB, G711 A/?-Law, G729A(B), G.723.1(A), G722, GSM-HR, GSM-FR, GSM-EFR, iLBC

PESQ – results available according to ITU standard P.826

POLQA – for wideband codecs on LTE

Hand-overs (intra/inter-system handover): Payload transition during handover

SMS – support for large number of SMS:  Calls and SMS supported at the same time

1G and 10G interface support (10s to 10Ks of ports supported)

VoLTE - critcal and complex
Most VoLTE implemenations are built with several vendors

Many components and networks involved:  Existing legacy network
New or existing IMS

Solver Operator Case Study

Operator with existing 2G and 3G networks builds 4G (multivendor)

Only data service for first year in 4G – Voice handled with CSFB to 2G/3G:
Early tests with few handsets gives indications of network quality
Implementation of IMS to enable VoLTE
Many small issues to resolve during the implemenatation of IMS

Implementation of SRVCC – Upgrades of EPC and  2G/3G core nodes
Test with Solver simulating few hundred UE
Issues found and resolved

Polystar provided tools and services to verify functionality of VoLTE and SRVCC
 Functional tests in implementation phase
Load test to verify VoLTE and SRVCC under load

 Quality & configuration challenges founded and resolved!

Conclusions from Case study
The use of handsets to test did not find all issues
Solver with just 100 simulated UE found several more config and other issues
Modifications in both legacy and new networks needed
The time for the implementation phase was drastically reduced
Services launched succesfully
New findings for fine tuning services found in load testing

Tested, verfied and planned = Quality network by Polystar Solver

VoLTE testing with Solver

IMS and MGW testing
Simulating the complete EPC and users connecting from the LTE network
Testing capacity and functionality of IMS.


EPC testing / System verification
Simulating UEs and eNodeB.
Making VoLTE calls over dedicated or default bearer.
Verify functionality and capacity.


SRVCC testing
Simulating UEs, eNodeBs, NodeBs, RNC, BTS and BSC.
Verify HO from LTE connected UE to UMTS/GSM according to SRVCC.


VoLTE Callflows in IMS

VoLTE System test


VoLTE + SRVCC System testing


System testing VoLTE
Solver simulates Radio Acess and UE to put MGW, MSC and EPC under test to verify VoLTE calls and SRVCC HO.
Test scenarios are built in small building blocks and put together in simulations.
Each simulation shares components like UE information.
Execution order within simulations and number of actions from each sub simulation is easily configured by the user.
Real life scenarios or needed mixes of traffic are easily configured and executed.


Typical Simulation Scenarios
 VoLTE – VoLTE call
VoLTE – 2G/3G Call
VoLTE call with SRVCC HO


Select Mobiles for simulation
Register in IMS
Call from (group) A to (group) B
Define Codecs, Voice payload, Call length etc


Collect statistics, errors and Voice quality measurements


Solver platforms and capacity

Solver Lite
100 simulated users
Feature testing

1000´s of simulated users
Load and Feature testing

Solver High Capacity
Load testing
500k simulated subscribers
 400 CallAttempsPerSecond,
90000 simulated RTP streams,
1 PESQ measurement per second

Solver Server Physical Dimensions:
- Height: 2x1U
- Width: 19”
- Depth: 28”


Ease of Use and Flexibility
User defines and executes simulations with GUI or CLI
All functions are the same in GUI and CLI
Automation is easily done via CLI or API to Solver
 Trace function built in for Quick trouble shooting

Solver benefits

Leading solution for Voice services
Legacy 2G/3G & 4G VoLTE in one

 Ease of use
Installation in one day
No tool experts needed
Fast set up of new simulations

Low cost of ownership
Smart support reduces costs
Less time and money spent on training