Tier‐aware joint subchannel and power allocation in uplink OFDMA heterogeneous networks. Issue 5 (19th December 2018)

• Record Type: Journal Article
• Authors: Rajabi, Hamed; Rasti, Mehdi; Pedram, Hossein; Yousefpour, Rohollah
• Is Part Of: Transactions on emerging telecommunications technologies. Volume 30:Issue 5(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-12-19
• Subjects: Telecommunication -- Periodicals; 384.05
• DOI: 10.1002/ett.3553
• Languages: English
• ISSNs: 2161-5748

Abstract

Abstract: We study the problem of tier‐aware subchannel and power allocation in the uplink of a two‐tier orthogonal frequency‐division multiple access heterogeneous network. We formulate the joint subchannel and power allocation problem in the macro‐tier as an optimization problem that is aware of the existence of the femto‐tier and aims to maximize the sum of tolerable interference caused by femto‐tier on its allocated subchannel(s) subject to the minimum data rate requirements of the macrocell user equipments (MUEs). The resource allocation problem for the macro‐tier is an NP‐hard mixed‐integer nonlinear programming (MINLP) problem. To address it, we reformulate and transform it to a tractable mixed‐integer linear programming (MILP) problem, which is optimally addressed with polynomial‐time complexity. We formulate the joint subchannel and power allocation problem in the femto‐tier as an optimization problem that is aware of the existence of the macro‐tier and aims to maximize the sum rate of the femtocell user equipments subject to the maximum tolerable interference caused to the MUEs. To address this MINLP problem, we transform it to a MILP problem through a linear approximation, which is solved optimally by IBM CPLEX solver. In addition, we develop a distributed and efficient algorithm that addresses this optimization problem suboptimally with a lower computational complexity. Numerical results show that our proposed algorithms outperform the existing algorithms in terms of network sum rate. Abstract : We consider the interaction between the macro‐tier and the femto‐tier and the interdependency between the joint subchannel and power allocation decision of one‐tier and other one. We optimally solve the joint subchannel and power allocation problem for uplink of macro‐tier to maximize the sum of tolerable interference of the MUEs. We address the joint subchannel and power allocation problem for the uplink of femto‐tier by using piecewise‐linear approximation without relaxing the integrality of subchannel allocation variables.