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Title: Joint user association and resource allocation in virtualized wireless networks
Authors: Parsaeefard, Saeedeh
Dawadi, Rajesh
Derakhshani, Mahsa
Le-Ngoc, Tho
Issue Date: 2016
Publisher: © IEEE
Citation: PARSAEEFARD, S. ... et al, 2016. Joint user-association and resource-allocation in virtualized wireless networks. IEEE Access, 4, pp.2738-2750
Abstract: this paper, we consider the down-link dynamic resource allocation in multi-cell virtualized wireless networks (VWNs) to support the users of different service providers (slices) within a specific region by a set of base stations (BSs) through orthogonal frequency division multiple access (OFDMA). In particular, we develop a joint BS assignment, sub-carrier, and power allocation algorithm to maximize the network sum rate, while satisfying the minimum required rate of each slice. Under the assumption that each user at each transmission instance can connect to no more than one BS, we introduce the user-association factor to represent the joint sub-carrier and BS assignment as the optimization variable vector in the problem formulation. Sub-carrier reuse is allowed in different cells, but not within one cell. As the proposed optimization problem is inherently non-convex and NP-hard, by applying the successive convex approximation (SCA) and complementary geometric programming (CGP), we develop an efficient two-step iterative approach with low computational complexity to solve the proposed problem. For a given problem, Step 1 derives the optimum user-association and subsequently, and for an obtained user-association, Step 2 finds the optimum power allocation. Simulation results demonstrate that the proposed iterative algorithm outperforms the traditional approach in which each user is assigned to the BS with the largest average value of signal strength, and then, joint sub-carrier and power allocation is obtained for the assigned users of each cell. Simulation results reveal a coverage improvement, offered by the proposed approach, of 57% and 71% for uniform and non-uniform users distribution, respectively, leading to higher spectrum efficiency for VWN.
Description: © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Sponsor: This work was supported in part by the Natural Sciences and Engineering Research Council of Canada (NSERC), Huawei Technologies Canada, and Prompt Quebec, via a Collaborative Research and Development Grant.
Version: Accepted for publication
DOI: 10.1109/ACCESS.2016.2560218
URI: https://dspace.lboro.ac.uk/2134/22941
Publisher Link: http://dx.doi.org/10.1109/ACCESS.2016.2560218
ISSN: 2169-3536
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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