A decentralized spectrum allocation and partitioning scheme for a two-tier macrofemtocell network with downlink beamforming

Sunheui Ryoo, Changhee Joo, Saewoong Bahk

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


This article examines spectrum allocation and partitioning schemes to mitigate cross-tier interference under downlink beamforming environments. The enhanced SIR owing to beamforming allows more femtocells to share their spectrum with the macrocell and accordingly improves overall spectrum efficiency. We first design a simplified centralized scheme as the optimum and then propose a practical decentralized algorithm that determines which femtocells to use the full or partitioned spectrum with acceptable control overhead. To exploit limited information of the received signal strength efficiently, we consider two types of probabilistic femtocell base station (HeNB) selection policies. They are equal selection and interference weighted selection policies, and we drive their outage probabilities for a macrocell user. Through performance evaluation, we demonstrate that the outage probability and the cell capacity in our decentralized scheme are significantly better than those in a conventional cochannel deployment scheme. Furthermore, we show that the cell utility in our proposed scheme is close to that in the centralized scheme and better than that in the spectrum partitioning scheme with a fixed ratio.

Original languageEnglish
Article number160
JournalEurasip Journal on Wireless Communications and Networking
Publication statusPublished - 2012
Externally publishedYes

Bibliographical note

Funding Information:
This study was supported in part by the NRF (National Research Foundation of Korea) grant funded by the Korea government (MEST) (No. 2011-0027517), in part by the MKE (The Ministry of Knowledge Economy), Korea, under the Convergence-ITRC (Convergence Information Technology Research Center) support program (NIPA-2012-H0401-12-1004) supervised by the NIPA (National IT Industry Promotion Agency) and in part by the research programs through National Research Foundation of Korea (NRF), funded by the Ministry of Education, Science, and Technology (No. 2011-0027517 and No. 2011-0008549).

ASJC Scopus subject areas

  • Signal Processing
  • Computer Science Applications
  • Computer Networks and Communications


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