LTE Uplink Interference Files

LTE system performance is highly limited by inter-cell interference, the superposition of the interfering signals from the users of all the neighboring cells transmitting on the same physical resources. The newly-defined orthogonal LTE uplink has changed the inter-cell interference characteristics completely:

  • by being highly time and frequency selective 
  • often being dominated by few users
  • changing with cell load and user traffic
  • depending on cell layout, user positions and movements
  • depending on RRM algorithms like scheduling, power control

This selective and dynamic interference, causing unexpected behavior, must not be neglected anymore in LTE field trials and performance testing e.g.  by using constant interference power or by using White Gaussian Noise as interference sources.

Nomor Research has, in cooperation with its partners, developed a cost-effective method for generating realistic uplink inter-cell interference signals. The uplink inter-cell interference signal of a multi-cell LTE network is reproduced in a realistic manner by comprehensive system level simulation and is generated physically by an off-the-shelf signal generator. 

The following interference files are available:

  1. Standard file package - free of charge
    6 3GPP recommended [Appendix A, 36.814] base line scenarios for VoIP and full buffer traffic with 70% cell load (transmit frequency 2 GHz, bandwidths 5/10/20 MHz)

  2. Extended file package - fixed price
    License for 30 additional scenarios (different transmit frequencies, bandwidths, cell sizes, cell loads, user speed etc.)
     
  3. Customized interference files - price per scenario
    Fully-customized inter-cell interference files for specific network deployments and configurations

Simulation is based on agreed 3GPP and NGMN simulation methodology that has been defined by the industry as being representative of future LTE networks and are widely used in research and standardization. Simulation results, though vendor-independent in terms of implementation, have been calibrated with tier-1 vendors’ system-level simulations published in 3GPP standardization.

The following signal generator hardware is supported:

If you are interested in licensing the uplink interference files please fill out the contact form.