System level evaluation of UL and DL interference in OFDMA mobile broadband networks

David Halls, AR Nix, MA Beach

Research output: Contribution to conferenceConference Abstract

13 Citations (Scopus)
593 Downloads (Pure)

Abstract

This paper presents results from a novel OFDMA multi-cell mobile broadband system level simulator. The tool is used to statistically characterize uplink and downlink inter-cell interference. Without suitable interference management, multi-billion dollar networks can collapse under the strain of heavy traffic loads. Fully loaded interference studies cannot be performed on the network until it has been fully deployed. As such, interference analysis and management must be accurately performed pre-deployment using detailed network simulators. System level simulation is a highly computationally intensive procedure. This paper discusses the simulator architecture (and steps taken to reduce computational complexity) and then demonstrates the impact of inter-cell interference in OFDMA networks. In an interference limited scenario the results demonstrate that it is the frame-to-frame fluctuations in interference, and not the received signal level, that dominate inaccuracies in the Channel Quality Index (CQI) prediction. CQI is used in the fast link-adaptation process to select the MCS mode for each user on a frame-byframe basis. Results show that incorrect Modulation and Coding Scheme (MCS) modes are chosen up to 40% of the time when the CQI is delayed by 3 frames and the user is interference limited. Perfect MCS selection is then shown to improve user throughput by up to 50%.
Original languageEnglish
Publication statusPublished - Mar 2011

Bibliographical note

Additional information: With accompanying conference presentation

Sponsorship: The work of David Halls was supported in part by the Engineering Physics Research Council (EPSRC) of UK and in part by Motorola UK.

Terms of use: Copyright © 2011 IEEE. Reprinted with permission, from DE Halls/AR Nix/MA Beach, paper title 'System level evaluation of UL and DL interference in OFDMA mobile broadband networks', IEEE WCNC 2011, March 2011.

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Name of Conference: Wireless Communications and Networking Conference
Venue of Conference: Quintana-roo, Mexico

Keywords

  • cellular
  • WiMAX
  • mobile broadband
  • MIMO
  • system level evaulation
  • interference characterization

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