Optimal Overlay Cognitive Spectrum Access with F-ALOHA in Macro-Femto Heterogeneous Networks

Lu Yang, S. H. Song, Khaled B. Letaief

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The 5th generation (5G) wireless networks are conceived in the form of heterogeneous networks (HetNets), where small cells are deployed over the conventional macrocell networks to improve the spectral efficiency. In HetNets, the interference between different tiers is the main bottleneck for achieving high spectral efficiency. Many spectrum access schemes have been proposed to manage the cross-tier interference. Unfortunately, the optimal spectrum access scheme remains unknown. In this paper, we propose an F-ALOHA based cognitive spectrum access scheme for macro-femto HetNets, where the femtocells can access the idle macro-tier spectrum with a certain probability. Therefore, besides the degrees of freedom from the conventional spectrum deployment and co-tier spectrum access, the proposed scheme obtains a new degree of freedom from cross-tier spectrum access for interference management and spectral efficiency optimization. Simulation results will show that the proposed scheme outperforms existing F-ALOHA based spectrum access schemes in terms of the area spectral efficiency (ASE). More importantly, it is observed that the maximum ASE is achieved when the number of active links per unit area, which governs the interference level, reaches a certain value. The advantage of the proposed scheme comes from its ability to offload the traffic between two tiers through the cross-tier spectrum access probability, which flexibly manages the cross-tier interference.

Original languageEnglish
Article number7294683
Pages (from-to)1323-1335
Number of pages13
JournalIEEE Transactions on Wireless Communications
Volume15
Issue number2
DOIs
Publication statusPublished - 1 Feb 2016
Externally publishedYes

Fingerprint

Heterogeneous networks
Heterogeneous Networks
Overlay
Macros
Spectral Efficiency
Interference
Femtocell
Wireless networks
Degree of freedom
Wireless Networks
High Efficiency
Traffic
Unknown
Unit
Optimization
Cell

Keywords

  • Area spectral efficiency
  • downlink
  • F-ALOHA
  • macro-femto HetNets
  • spectrum access

ASJC Scopus subject areas

  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Optimal Overlay Cognitive Spectrum Access with F-ALOHA in Macro-Femto Heterogeneous Networks. / Yang, Lu; Song, S. H.; Letaief, Khaled B.

In: IEEE Transactions on Wireless Communications, Vol. 15, No. 2, 7294683, 01.02.2016, p. 1323-1335.

Research output: Contribution to journalArticle

@article{46b3fffa9e404cb9ac95bd3b906e0953,
title = "Optimal Overlay Cognitive Spectrum Access with F-ALOHA in Macro-Femto Heterogeneous Networks",
abstract = "The 5th generation (5G) wireless networks are conceived in the form of heterogeneous networks (HetNets), where small cells are deployed over the conventional macrocell networks to improve the spectral efficiency. In HetNets, the interference between different tiers is the main bottleneck for achieving high spectral efficiency. Many spectrum access schemes have been proposed to manage the cross-tier interference. Unfortunately, the optimal spectrum access scheme remains unknown. In this paper, we propose an F-ALOHA based cognitive spectrum access scheme for macro-femto HetNets, where the femtocells can access the idle macro-tier spectrum with a certain probability. Therefore, besides the degrees of freedom from the conventional spectrum deployment and co-tier spectrum access, the proposed scheme obtains a new degree of freedom from cross-tier spectrum access for interference management and spectral efficiency optimization. Simulation results will show that the proposed scheme outperforms existing F-ALOHA based spectrum access schemes in terms of the area spectral efficiency (ASE). More importantly, it is observed that the maximum ASE is achieved when the number of active links per unit area, which governs the interference level, reaches a certain value. The advantage of the proposed scheme comes from its ability to offload the traffic between two tiers through the cross-tier spectrum access probability, which flexibly manages the cross-tier interference.",
keywords = "Area spectral efficiency, downlink, F-ALOHA, macro-femto HetNets, spectrum access",
author = "Lu Yang and Song, {S. H.} and Letaief, {Khaled B.}",
year = "2016",
month = "2",
day = "1",
doi = "10.1109/TWC.2015.2488654",
language = "English",
volume = "15",
pages = "1323--1335",
journal = "IEEE Transactions on Wireless Communications",
issn = "1536-1276",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "2",

}

TY - JOUR

T1 - Optimal Overlay Cognitive Spectrum Access with F-ALOHA in Macro-Femto Heterogeneous Networks

AU - Yang, Lu

AU - Song, S. H.

AU - Letaief, Khaled B.

PY - 2016/2/1

Y1 - 2016/2/1

N2 - The 5th generation (5G) wireless networks are conceived in the form of heterogeneous networks (HetNets), where small cells are deployed over the conventional macrocell networks to improve the spectral efficiency. In HetNets, the interference between different tiers is the main bottleneck for achieving high spectral efficiency. Many spectrum access schemes have been proposed to manage the cross-tier interference. Unfortunately, the optimal spectrum access scheme remains unknown. In this paper, we propose an F-ALOHA based cognitive spectrum access scheme for macro-femto HetNets, where the femtocells can access the idle macro-tier spectrum with a certain probability. Therefore, besides the degrees of freedom from the conventional spectrum deployment and co-tier spectrum access, the proposed scheme obtains a new degree of freedom from cross-tier spectrum access for interference management and spectral efficiency optimization. Simulation results will show that the proposed scheme outperforms existing F-ALOHA based spectrum access schemes in terms of the area spectral efficiency (ASE). More importantly, it is observed that the maximum ASE is achieved when the number of active links per unit area, which governs the interference level, reaches a certain value. The advantage of the proposed scheme comes from its ability to offload the traffic between two tiers through the cross-tier spectrum access probability, which flexibly manages the cross-tier interference.

AB - The 5th generation (5G) wireless networks are conceived in the form of heterogeneous networks (HetNets), where small cells are deployed over the conventional macrocell networks to improve the spectral efficiency. In HetNets, the interference between different tiers is the main bottleneck for achieving high spectral efficiency. Many spectrum access schemes have been proposed to manage the cross-tier interference. Unfortunately, the optimal spectrum access scheme remains unknown. In this paper, we propose an F-ALOHA based cognitive spectrum access scheme for macro-femto HetNets, where the femtocells can access the idle macro-tier spectrum with a certain probability. Therefore, besides the degrees of freedom from the conventional spectrum deployment and co-tier spectrum access, the proposed scheme obtains a new degree of freedom from cross-tier spectrum access for interference management and spectral efficiency optimization. Simulation results will show that the proposed scheme outperforms existing F-ALOHA based spectrum access schemes in terms of the area spectral efficiency (ASE). More importantly, it is observed that the maximum ASE is achieved when the number of active links per unit area, which governs the interference level, reaches a certain value. The advantage of the proposed scheme comes from its ability to offload the traffic between two tiers through the cross-tier spectrum access probability, which flexibly manages the cross-tier interference.

KW - Area spectral efficiency

KW - downlink

KW - F-ALOHA

KW - macro-femto HetNets

KW - spectrum access

UR - http://www.scopus.com/inward/record.url?scp=84962175840&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84962175840&partnerID=8YFLogxK

U2 - 10.1109/TWC.2015.2488654

DO - 10.1109/TWC.2015.2488654

M3 - Article

VL - 15

SP - 1323

EP - 1335

JO - IEEE Transactions on Wireless Communications

JF - IEEE Transactions on Wireless Communications

SN - 1536-1276

IS - 2

M1 - 7294683

ER -