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Newsletter: Enhanced Wireless (GSM) Traffic Emulation & Analysis

Welcome to another July 2009 issue of GL's Newsletter providing information and insight into our recently enhanced application TRAU Traffic Emulation and Analysis.Several client server modules have been enhanced that make our TRAU tools extremely useful in wireless simulation and analysis.

Overview:

GSM technology dominates wireless communication. The A-bis interface, between Base Transceiver Station (BTS) and Base Station Controller (BSC) within the GSM network carries voice, data and signaling. The BSC is responsible for the exchanges of messages towards Mobile Switching Center (MSC) and the BTS. To reduce bandwidth requirements on the BTS-BSC and BSC-MSC interface, service providers use transcoders or voice compression technology - known as TRAU, or Transcoder/Rate Adapter Unit. TRAU frames between the BTS and BSC/MSC carry compressed speech, data, and O&M frames over T1 E1 lines.

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GL's T1 E1 Analyzer can be equipped with:


TRAU ToolBox™

TRAU Toolbox™ is a GUI based application that allows user to send/receive TRAU frames containing real time voice traffic using various codecs including GSM, AMR, and EFR. Important features of the application are:

  • A GUI based application
  • Simulates TRAU traffic over Abis and Ater interfaces
  • Perfect for testing backhaul networks
  • Create multiple sessions of uplink or downlink in 8 or 16 Kbps
  • Generate TRAU frames of different codec types like GSM, AMR-NB/WB,EFR etc
  • Traffic types such as speech, digits, and tones can be sent/received within TRAU frames; Insert/playback real time speech
  • Spectral and oscilloscope displays monitor received signals
  • Time alignment for individual TRAU sessions

For comprehensive information on the application, please refer to TRAU Toolbox application web page.


TRAU Traffic Playback

TRAU traffic playback is a simple GUI application to playback TRAU frames on 8kbps and 16kbps streams using "hdl" files i.e. pre captured data using TRAU Protocol Analyzer or Client Server TRAU Record/Playback application. TRAU frames can also be corrupted using bit invert options.

For comprehensive information on the application, please refer to TRAU Traffic Playback web page.


TRAU Record/Playback Client Server

TRAU Record /Playback is a command-line based client server application that allows transmission / reception of TRAU frames in *.hdl file format. This permits remote operation, automation, and multi-site connectivity.

For comprehensive information on the application, please refer to Client Server TRAU Record/Playback Application web page.


TRAU Protocol Analyzer

TRAU Protocol Analyzer can be used to auto detect, decode and analyze full rate and half rate TRAU frames for GSM, AMR-NB/WB, EFR and other codec types as per 3GPP 8.60 and 8.61 specifications. TRAU Packet Data Analysis (PDA) feature in TRAU Protocol Analyzer allows users to extract, process and store the contents of TRAU frames - speech, digits or tones. Summary and detail views of individual TRAU sessions can be seen in PDA. Summary view includes active call graph, TRAU Traffic monitoring options to monitor real time traffic. The Detail view shows the statistics, inband events, wavegraph and the spectral display for the selected call. It can also be configured to trigger and capture calls pertaining only to specific Codec types.

For comprehensive information on the application, please refer to TRAU Protocol Analyzer web page.


TRAU Traffic Emulator & Analyzer - CLI Based

TRAU Traffic Emulator & Analyzer(CLI) is a command-line based client server application, which is similar to TRAU Traffic Emulator & Analyzer - GUI based application. All the features of TRAU Traffic Emulator & Analyzer - GUI based application can be found in this application.

For comprehensive information on the application, please refer to TRAU Traffic Emulator & Analyzer - CLI Based web page.


TRAU Traffic Emulator & Analyzer - GUI Based

TRAU Traffic Emulator & Analyzer is a GUI (Graphic User Interface) based client server application, which can simulate & analyze TRAU/CCU (BTS or BSC end) on GL's T1/E1 cards. This application can be used to test the correctness of received data, by comparing with predefined patterns. Important features of the application are:

  • This is a GUI based application but still client server based
  • Simulates TRAU traffic over Abis and Ater interfaces
  • Test backhaul networks
  • Create multiple sessions of uplinks / downlinks in 8/16 Kbps
  • Allows users to generate TRAU frames of different codec types like GSM, AMR-NB/WB, EFR etc.
  • Traffic source can be sequence numbers, HDL files (containing TRAU frames), flat binary files, and user-defined frames (ASCII HEX strings).
  • On receiving side, the data is compared with predefined patterns; statistics collected on errors
  • Impairments like CRC error, sync error can be applied to the transmitted frames
  • Time alignment also can be specified for individual TRAU sessions

For comprehensive information on the application, please refer to TRAU Traffic Emulator & Analyzer - GUI Based web page.


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