Wireless Emulation

Wireless Emulation : US Patent 7,231,330 

A wireless Emulation with and RF Fading that is capable of recreating “Drive Test” environments. This IP facilitates the development and testing of mobile phones.  The ‘330 Ppatent enables phone and mobile application designers to recreate an RF and infrastructure conditions found in 3G/4G deployments .

Main Features found in the patent also in the ETSI Specification for 3GPP/LTE and others:

  • Fading and terrain emulation (PDF)
  • Networking simulation at different delays and bandwidths
  • Automated tools for testing and validation of mobile, audio applications, and performance of new mobility protocols

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Standard Specifications

ETSIThe ‘330 Patent reads on The ETSI World Class Standard for 3GPP :

  • 3GPP/ETSI 136 508, (PDF)
  • 3GPP/ETSI TS 36 141 (PDF) and others related to testing the UT (Unit under Test)
    • A list of test cases are shown 8.2.1, 8.2.2, 8.2.3, 8.2.4, and many others
  • ETSI 137 976  (PDF) showing the work plan for MIMO OTA Testing and Fading
    • As such, MIMO throughput is defined as f function of Transmitted TBS and Number of ACKS divided by time.
    • SNR also provides a way to bested with AWGN and no fading
    • Testing of MIMO handset under co-channel interference  SNR = P/Pi  where Pi is the interference
    • The components of the solution presented in the ETSI 137 97 specification are:
      • An Anechoic Chamber
      • System Simulator (Network Emulator)
      • N channel RF emulator with OTA channel generation Features
      • N antenna elements connected
      • Channel model for each case as per specification

Key Concepts in the ‘330 Patent

  • Wirelessly Communicates, as ruled by Judge More, Wireless Means without Wires and hence the patent applies under the presence or use of radiated tests. Radiated tests are crucial for MIMO Testing. However, conducted testing can be shown to be equivalent to radiated testing in most cases.
  • By changing the RSSI parameters, signal strength as a function of Path Loss or Log(x) of the power received by the mobile terminal. This can be emulated in many ways as used in 3GPP in wheat’s called Emulation Profile (html)
  • The patent covers playback of RSSI database with fading models that may also include BER (Bit Error Rate) values to simulate propagation and RSSI changes for the mobile terminal plus a particle fading profile
  • Wireless Emulation of a back end network that uses IP-based or Packet Data communications where registration using Mobile IP or a similar protocol is used to initiate a mobile terminal.
  • Playback of RSSI is widely used in the industry while conducting MT and MO calls.
  • The tests used by the patent are NOT related to Total Radiated Power (although you may test it as well) or other similar Antenna-only tests. The emulator is design to test performance during “DRIVE TESTING” conditions

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