LTE EPC Testing

The 6100 represents the state of the art when it comes to LTE EPC testing. Whether you're designing new LTE equipment or wanting to make sure your network is rock solid, the 6100 has you covered.

Because the 6100 can emulate the EPC for you, you can surround your node or nodes under test and perform both functional and perfomrance testing.

Solution: The Torrent 6100
VoLTE Testing

The latest version of the 6100 features comprehensive Voice over LTE support, and with it you can easily set up a single mobile to mobile call or run VoLTE traffic and examine various system performance indicators in real time from delay and latency to a MOS estimate that factors in airlink delay and latency.

Easily combine all of that simultaneously with high bandwidth data traffic in the background, and make sure your EPC performs the way you expect it to.

Solution: The Torrent 6100
SMS Testing

The latest addition to the 6100 is SMS functional and load testing of mobile originated and mobile terminated SMS.

With it tens of thousands of messages per second can be sent to your SMSC under test, or you can use ours and test your MSC/VLR or HLR.

Both functional and load testing are supported, including various error scenarios.

Solution: The Torrent 6100


The Torrent 6100 LTE EPC Test System is a flexible and realistic platform that allows for testing of 4G LTE evolved packet core (EPC) network elements together or in various combinations. It is a turn key solution for functional and load testing of of Serving Gateway (SGW), PDN Gateway (PGW), Mobility Management Entity (MME), and AAA network elements, and allows you to verify their performance under stress while at the same time ensuring that end-subscriber QoE requirements are met. Beyond this, the Torrent 6100 can also emulate SGSNs and GGSNs, allowing for 3G core network testing. 

With many years of field proven technology inherited from its Torrent series counterparts, the Linux based Torrent 6100 packs numerous innovations of its own, including very highly configurable control plane messages suitable for customizations of various kinds or for negative test case evaluation. 

The Torrent 6100 emulates all network elements in real time as realistically as possible, so that the tests you run in the lab give you confidence that your equipment is ready to go live. It's like a debugger for your 4G LTE EPC network that lets you set up and analyze basic call scenarios:

Torrent 6100 GUI with S1 Handover

Then run highly complex parallel call profiles that scale linearly to stress even the largest networks. For example, in with the latest version of the 6100, one can generate over 10K attachs per second on just a single 2U server, while many thousands of data streams are running concurrently over the user plane at 10GE saturating rates:

And this traffic can be scaled linearly to the level desired just by adding additional hardware, with each 2U server delivering 20Gbps of sustained traffic.

Torrent 6100 LTE Test System Architecture

As shown above, the Torrent 6100 consists of a suite of subsystems that work together in a unified manner to provide a realistic, high performance, lineraly-scalable LTE core network test solution which supports both IPv4 and IPv6 for mobiles and network nodes.

The CS-6100 is the central controller for the system which is Java/Linux based. This central controller, automatically configures, starts, and directs the traffic servers in the system to run tests as directed by the user through a GUI interface.

The MTS-6100 traffic server authentically simulates 1 to 5M+ UEs and thousands of enhanced NodeBs (eNBs) on a Linux machine. The MME-6100 simulates the Mobility Management Entity, or alternatively can be replaced with the MME under test. Similarly the SGW-6100 and PGW-6100 simulate the Serving Gateway and PDN Gateways respectively, and like the MME-6100 may be replaced with their counterparts under test as desired. Finally, the NTS-6100 provides a convenient aggregation of network servers (MMS, HTTP, FTP, SMTP, DHCP, PoC, WAP, etc.) as well as acting as a PCRF, CGF, and Radius Server.

Torrent 6100 LTE Test System Architecture

One of the latest features in the system is support for high speed streaming of many different types of popular traffic types including YouTube, Netflix, Facebook, Pandora, and the like, and for doing so at very high rates and with very low packet loss even at those rates. As can be seen above, this is accomplished by the addition of a new Stream Traffic Server (STS) component to the system. This new element of the system works in lock step with the control plane to allow mobiles to stream these new traffic types with very high precision; that is, packet transmission rates, and interarrival times are very authentic compared to how such streams appear in the field (in those respects).

Torrent 6100 Product Data Sheet
   Torrent 6100 LTS Product Brief (PDF)


LTE Interfaces Supported
  • S11 - The MME to SGW Interface
  • S1-U - The ENB to SGW Interface
  • S1-MME - The ENB to MME Interface (S1AP)
  • NAS - The UE to MME Interface
  • S5 - The SGW to PGW Interface
  • S8 - PLMN Varient of S5
  • SGi - The PDN / Internet Interface
  • Gx - The PGW to PCRF Interface
  • Gxc - The SGW to vPCRF Interface
  • Rx - The IMS to PCRF Interface
LTE Nodes Emulated
  • Mobility Management Entity (MME)
  • Enhanced NodeB (ENB)
  • Serving Gateway (SGW)
  • PDN Gateway (PGW)
  • User Equipment (UE)
  • Policy Charging and Rules Function (PCRF)
  • Policy and Charging Enforcement Function (PCEF)
3G Interfaces Supported
  • Gn - From the SGSN to GGSN
  • Gi - The PDN / Internet Interface
  • Ga - The GGSN to CGF Interface
3G Nodes Emulated
  • Serving GPRS Support Node (SGSN)
  • Gateway GPRS Support Node (GGSN)
  • Charging Gateway Function (CGF)
  • Radius AAA Server
Core Network Elements That May Be Tested
  • Mobility Management Entity (MME)
  • Enhanced NodeB (ENB)
  • Serving Gateway (SGW)
  • PDN Gateway (PGW)
  • Policy Charging and Rules Function (PCRF)
  • Policy and Charging Enforcement Function (PCEF)
  • Charging Gateway Function (CGF)
  • Gateway GPRS Support Node (GGSN)



Key System Features

Realistic Mobile Simulation
A central feature of the system is that it is realistic, and simulates mobiles and the application data traffic that they generate as precisely as possible. In particualr, mobiles are stateful and have their own network stacks built-in. 

Realistic Network Simulation
Because the entire network around the system under test is authentically simulated, complex call scenarios can easily be created. This kind of test bed realism has allowed our users to recreate field issues that otherwise were not reproducible in the lab [i.e. this has been the case with our other Torrent products which use very similar technology]. 

Linux Based
All of our systems are Linux based and the Torrent 6100 is no exception. This provides our users with a state of the art operating system, that they are almost invariably familiar with. 

High Speed Dataplane Architecture
The Torrent 6100 was designed from the ground up for very high data plane throughput. In the latest release, we've achieved our goal of allowing for line rate streaming of arbitrary traffic types, inlcuding video and voice at near line rates and with hardly any loss. With our ability to stream linearly, and also to generate complex control plane traffic this provides for rather comprehensive stress for the system under test. 

Highly Parallel Simulation
Parallelism is supported on numerous levels. Typically, parallelism is created when more than one test case is executed at the same time during a test suite of by hand. However, parallelism can be extended down to the individual mobile subscriber as illustrated in the following mobile script:

attach enb enb1
        http_get url
        handover enb enb2

Full Automation Support
Test cases may be fully automated and allow the end user to interact with the system under test via ssh, telent, ftp, etc. through an Expect style interface. 

Linear Scalability
Any traffic profile can be scaled linearly by simply adding more computing hardware, and this can be accomplished wihout having to rewrite or otherwise modify test cases. 

Ease of Use
The Torrent 6100 features a simple installation process and intuitive multi-user GUI. And it does not require programming knowledge to operate. Thus the learning curve is rather minimal - the philosophy being we want you to concentrate on your work, and not on how to run the test system.
QoE Characterization
A key aspect of the system is that it allows the end subscriber's experience to be characterized through a number of key performance indicators (KPIs). For each KPI, the system tracks not only the mean and standard deviation, but a complete high resolution histogram as shown below for MMS: 


MMS Histogram

Histograms are particularly useful for studying the effect of background traffic on interactive traffic, especially under heavy loads. 

QoS You Can See and Hear
A unique feature of the system is that it allows any PC to connect to one of the simulated mobiles and relay all of its traffic through it. In this way, the performance of streaming media applications such as YouTube can be subjectively evaluated under different traffic conditions. 

Detailed Hierarchical Statistics
Hundreds of statistics are captured by the system on both the MTS and NTS and they are organized in a hierarchical manner to allow both the big picture and the finer details to be seen more clearly. These statistics may be examined in real time by test cases, or they may be exported in build via CSV file to Excel. Additionally KPIs may be graphed dynamically. 

Configurable Messaging
The structure and content of messages can be configured via XML templates which may be edited via the GUI.
Network Service Assurance
While the Torrent system was originally designed for lab use, it may also be used to perform in-service networkmonitoring. For example, network entry, handover and data path functionality can be spot-checked periodically and an alarm raised if failures are detected. 

Extensive Dataplane Support
Dataplane functionality is seamlessly and naturally integrated into the system. Each mobile directly supports: IP, TCP, UDP, HTTP, WAP, MMS, PTT (PoC), SIP, RTP, RTCP, FTP, SMTP, POP3, ICMP, DHCP, and DNS. This in addition to the new STS based streaming capabilities that allow for streaming modern, popular traffic types like YouTube and Netflix. 


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