Joint Sub-Channel Assignment and Power Allocation in Heterogeneous Networks: An Efficient Optimization Method

This letter is concerned with joint sub-channel and power allocation in a heterogeneous network. We consider the uplink of a co-channel framework where a macrocell shares the orthogonal frequency division multiple access (OFDMA) sub-channels with a number of small cells (SCs). We maximize the weight...

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Published in:IEEE communications letters Vol. 20; no. 12; pp. 2490 - 2493
Main Authors: Khamidehi, Behzad, Rahmati, Ali, Sabbaghian, Maryam
Format: Journal Article
Language:English
Published: New York IEEE 01.12.2016
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Approximation
D.C. programming
Frequency division multiple access
Heterogeneous networks
Interference
Linear programming
Mathematical analysis
Mixed integer
mixed integer non-linear problem
OFDMA heterogeneous networks
Optimization
Programming
resource allocation
Resource management
Uplink
User satisfaction
ISSN:1089-7798, 1558-2558
Online Access:Get full text
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Abstract This letter is concerned with joint sub-channel and power allocation in a heterogeneous network. We consider the uplink of a co-channel framework where a macrocell shares the orthogonal frequency division multiple access (OFDMA) sub-channels with a number of small cells (SCs). We maximize the weighted sum-rate of the OFDMA SC network, while a target constraint on the cross-tier interference and a minimum data rate requirement for the high data rate SC users are satisfied. The optimization problem is a highly non-convex mixed integer non-linear problem. We first reformulate the problem into a more mathematically tractable form. Then, we relax the integer variables by adding a penalty term to the objective function. Finally, we rewrite the objective function as the difference of two concave (D.C.) functions and solve this problem using the successive convex approximation method. We show that our method outperforms the state-of-the-art schemes.
AbstractList This letter is concerned with joint sub-channel and power allocation in a heterogeneous network. We consider the uplink of a co-channel framework where a macrocell shares the orthogonal frequency division multiple access (OFDMA) sub-channels with a number of small cells (SCs). We maximize the weighted sum-rate of the OFDMA SC network, while a target constraint on the cross-tier interference and a minimum data rate requirement for the high data rate SC users are satisfied. The optimization problem is a highly non-convex mixed integer non-linear problem. We first reformulate the problem into a more mathematically tractable form. Then, we relax the integer variables by adding a penalty term to the objective function. Finally, we rewrite the objective function as the difference of two concave (D.C.) functions and solve this problem using the successive convex approximation method. We show that our method outperforms the state-of-the-art schemes.
Author Khamidehi, Behzad
Rahmati, Ali
Sabbaghian, Maryam
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  givenname: Ali
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  givenname: Maryam
  surname: Sabbaghian
  fullname: Sabbaghian, Maryam
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  organization: Sch. of Electr. & Comput. Eng., Univ. of Tehran, Tehran, Iran
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Cites_doi 10.1017/CBO9780511804441
10.1109/JSAC.2011.110613
10.1109/TWC.2014.2324588
10.1109/TCOMM.2014.2328574
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10.1109/TWC.2015.2432753
10.1109/WCL.2014.032814.130888
10.1109/TWC.2015.2512919
10.1109/TWC.2013.111313.130645
10.1109/TSP.2010.2078811
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SubjectTerms Approximation
D.C. programming
Frequency division multiple access
Heterogeneous networks
Interference
Linear programming
Mathematical analysis
Mixed integer
mixed integer non-linear problem
OFDMA heterogeneous networks
Optimization
Programming
resource allocation
Resource management
Uplink
User satisfaction
Title Joint Sub-Channel Assignment and Power Allocation in Heterogeneous Networks: An Efficient Optimization Method
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https://www.proquest.com/docview/1848269974
Volume 20
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