The Torrent 7200 WTS (WiMAX Test System) is designed to comprehensively test 802.16e base stations, and builds on the foundation established by the Torrent 7100 which was the world's first system for testing ASN gateways and CSNs. It provides an entire WiMAX ecosystem which surrounds the base station and can then be used to perform functional testing, load, capacity, and performance testing. Although an entire WiMAX ecosystem is provided, components can be swapped out for commercial counterparts if desired; for example although we supply an ASN gateway, you could use your own, but then still user our CSN. The Torrent 7200 is based on scalable-OFDMA and is available in two general varients; one which actually tests the airlink and one which bypasses it entirely for cases in which MAC rather than MAC/PHY testing is of interest. Key Benefits Faster time to market Reduced development and test effort Interoperability confidence Performance and capacity confidence Subscriber QoE / QoS assurance Key WiMAX Features 802.16e MAC Testing 802.16e PHY Testing Live Airlink Testing Drive Test Capability Serial Baseband Interface RF Interface at 2.5GHz, 3.3GHz, 3.5GHz, and 3.8GHz ASN Profile A and C support Client Mobile IP (CMIP) Support Proxy Mobile IP (PMIP) Support Network Entry Auth/Reauth: EAP-MD5, EAP-TLS, EAP-TTLS, EAP-SIM, EAP-AKA, MSCHAPv2 Initial Service Flow Activation Network Exit Full Dataplane Support (IP CS) R6 Handover R4/R6 Mixed Mobility Handover R3 Relocation (with Auth Relocation) Uncontrolled Handover Multi-target Handover Full Tracing (R3/R4/R6) Dynamic Key Distribution Idle Mode Entry Paging Location Update Idle Mode Exit Reauthentication RRM (11/07)

The Torrent 7200 is available in two models. The first varient is the Torrent 7220 and it provides a platform for real time testing of the 802.16e MAC, including OFDMA framing. One of the key aspects of this architecture is that OFDMA frames are sent by the MAC layer to the PHY layer in accordance with the Intel OFDMA PHY SAP. In this case the PHY layer is actually a type of 802.16e "cross-over" that we've termed the Virtual PHY. In particular, when the base station sends a downlink subframe, it will tell the MS side that it has received that same downlink subframe, and visa-versa.

So, in the architecutre above, we have MTS-7200 authenticlly simulates very large numbers of mobiles and conversing with the Virtual PHY. Next, there is the BS under test, or our own BS-7200 (e.g. for testing handovers or mobile stations adhering to the Intel PHY SAP spec).

Further upstream, the ASN-7100 simulates an ASN Gateway which can be useful for testing CSNs or testing R4/R6 mobility. Similarily, the CSN-7100 can simulate a CSN Node for ASN Gateway testing. Finally, the NTS-7100 provides a convenient aggregation of network servers (MMS, PoC, WAP, HTTP, FTP, SMTP, etc.).

Not shown for clarity is the CS-7200 which is the central controller for the system which is Linux based. This server automatically configures, starts, and directs the traffic servers in the system to run tests as directed by the user through the UI-7200 GUI.

The Torrent 7240 communicates directly with the base station (or base stations) using live air or coax, thus the key difference is the PHY which has the following specifications.

PHY Specifications

Parameter	Specification
Frequency Bands	2.5GHz, 3.3GHz, 3.5GHz, and 3.8Ghz
Channel Bandwidth	5MHz, 7MHz, and 10MHz
Air Interface	IEEE 802.16e-2005 / S-OFDMA
Duplex Mode	TDD, H-FDD
Modulation and Coding	64-QAM (Coding rates 2/3 and 3/4), 16-QAM (Coding rates 1/2 and 3/4), and QPSK Coding rates 1/2 and 3/4)
Baseband to RF Interface (2H08)	Serial Copper, Optical Fiber
Security	AES and PKMv2
QoS	Unsolicited Grant Service (UGS), Real-time Polling Service (rtPS), Extended Real-time Polling Service (ertPS), Non-real-time Polling Service (nrtPS), and Best Effort (BE)
Capacity	1,000 SS/channel

Availability: The 7240 will be available beginning next month (May 2008).

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 aroudn the system under test is authentically simulated, compelex tests such as inter-ASN gateway handover with ensuing R3 relocation and authenticator relocation can be performed -- all with concurrent data path continuity testing.

Commercial Hardware and Software
Because our systems run primarily on Linux, off-the-shelf PC hardware can be used. Thus the Torrent solution rides both the PC hardware power curve and the Linux operating system power curve. As a convenience, Mobile Metrics certified hardware platforms may be used if desired.

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 bs <asn1>
parallel:
      http_get url http://test.mobilemetrics.net
      handover bs <asn2>
parend
detach


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 7200 features a simple installation process and intuitive multi-user GUI. And it does not require programming knowledge to operate.

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:

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.

Full Messaging Control
All control and data messages and their associated message flows may easily be modified by the end user using oru patent-pending filtering layer. This allows a virtually limitless number of error scenarios or unusual messages flows to be tested.

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.

To register for a free online demo, please click here, otherwise for further technical information, or specifications, please contact Mobile Metrics sales.