Analysis and optimization of interference nulling in downlink multi-antenna HetNets with offloading

Yueping Wu, Ying Cui, Bruno Clercks

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Heterogeneous networks (HetNets) with offloading is considered as an effective way to meet the high data rate demand of future wireless service. However, the offloaded users suffer from strong inter-tier interference, which reduces the benefits of offloading and is one of the main limiting factors of the system performance. In this paper, we investigate the use of an interference nulling (IN) beamforming scheme to improve the system performance by carefully managing the inter-tier interference to the offloaded users in downlink two-tier HetNets with multi-antenna base stations. Utilizing tools from stochastic geometry, we derive a tractable expression for the rate coverage probability of the IN scheme. Then, we optimize the design parameter, i.e., the degrees of freedom that can be used for IN, to maximize the rate coverage probability. Specifically, in the asymptotic scenario where the rate threshold is small, by studying the order behavior of the rate coverage probability, we characterize the optimal design parameter. For the general scenario, we show some properties of the optimal design parameter. Finally, by numerical simulations, we show the IN scheme can outperform both the simple offloading scheme without interference management and the almost blank subframes scheme in 3GPP LTE, especially in large antenna regime.

Original languageEnglish
Title of host publication2015 IEEE International Conference on Communications, ICC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2457-2462
Number of pages6
Volume2015-September
ISBN (Electronic)9781467364324
DOIs
Publication statusPublished - 2015 Sep 9
EventIEEE International Conference on Communications, ICC 2015 - London, United Kingdom
Duration: 2015 Jun 82015 Jun 12

Other

OtherIEEE International Conference on Communications, ICC 2015
CountryUnited Kingdom
CityLondon
Period15/6/815/6/12

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications

Fingerprint Dive into the research topics of 'Analysis and optimization of interference nulling in downlink multi-antenna HetNets with offloading'. Together they form a unique fingerprint.

  • Cite this

    Wu, Y., Cui, Y., & Clercks, B. (2015). Analysis and optimization of interference nulling in downlink multi-antenna HetNets with offloading. In 2015 IEEE International Conference on Communications, ICC 2015 (Vol. 2015-September, pp. 2457-2462). [7248693] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICC.2015.7248693