中国邮电高校学报(英文)

• Wireless • 上一篇    下一篇

Pseudo-handover based subchannel and power adaptation scheme for interference mitigation in OFDMA two-tier femtocell networks

李宏佳1,胡丹2,许晓东2   

  1. Wireless Technology Innovation Institute, Key Laboratory of Universal Wireless Communication, Ministry of Education,Beijing University of Posts and Telecommunications, Beijing 100876, China
  • 收稿日期:2010-11-01 修回日期:2011-04-06 出版日期:2011-06-30 发布日期:2011-06-13
  • 通讯作者: 李宏佳 E-mail:prince.lhj@gmail.com
  • 基金资助:

    北京市科委自然科学基金;中芬合作项目;国家自然科学基金“异构IP网络中基于多目标决策理论的资源优化技术研究”

Pseudo-handover based subchannel and power adaptation scheme for interference mitigation in OFDMA two-tier femtocell networks

  1. Wireless Technology Innovation Institute, Key Laboratory of Universal Wireless Communication, Ministry of Education,Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2010-11-01 Revised:2011-04-06 Online:2011-06-30 Published:2011-06-13
  • Contact: Hong-Jia LI E-mail:prince.lhj@gmail.com
  • Supported by:

    Key Project of Beijing Municipal Science & Technology Commission;International Cooperation and Exchanges Project

摘要:

In the two-tier femtocell network, a central macrocell is underlaid with a large number of shorter range femtocell hotspots, which is preferably in the universal frequency reuse mode. This kind of new network architecture brings about urgent challenges to the schemes of interference management and the radio resource allocation. Motivated by these challenges, three contributions are made in this paper: 1) A novel joint subchannel and power allocation problem for orthogonal frequency division multiple access (OFDMA) downlink based femtocells is formulated on the premise of minimizing radiated interference of every Femto base station. 2) The pseudo-handover based scheduling information exchange method is proposed to exchange the co-tier and cross-tier information, and thus avoid the collision interference. 3) An iterative scheme of power control and subchannel is proposed to solve the formulated problem in contribution 1), which is an NP-complete problem. Through simulations and comparisons with four other schemes, better performance in reducing interference and improving the spectrum efficiency is achieved by the proposed scheme.

关键词:

femtocell, OFDMA, interference mitigation, resource management, power control

Abstract:

In the two-tier femtocell network, a central macrocell is underlaid with a large number of shorter range femtocell hotspots, which is preferably in the universal frequency reuse mode. This kind of new network architecture brings about urgent challenges to the schemes of interference management and the radio resource allocation. Motivated by these challenges, three contributions are made in this paper: 1) A novel joint subchannel and power allocation problem for orthogonal frequency division multiple access (OFDMA) downlink based femtocells is formulated on the premise of minimizing radiated interference of every Femto base station. 2) The pseudo-handover based scheduling information exchange method is proposed to exchange the co-tier and cross-tier information, and thus avoid the collision interference. 3) An iterative scheme of power control and subchannel is proposed to solve the formulated problem in contribution 1), which is an NP-complete problem. Through simulations and comparisons with four other schemes, better performance in reducing interference and improving the spectrum efficiency is achieved by the proposed scheme.

Key words:

femtocell, OFDMA, interference mitigation, resource management, power control