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Low-Complexity Scheduling and Power Adaptation for Coordinated Cloud-Radio Access Networks

Douik, Ahmed and Dahrouj, Hayssam and Al-Naffouri, Tareq Y. and Alouini, Mohamed-Slim (2017) Low-Complexity Scheduling and Power Adaptation for Coordinated Cloud-Radio Access Networks. IEEE Communications Letters, 21 (10). pp. 2298-2301. ISSN 1089-7798.

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In practical wireless systems, the successful implementation of resource allocation techniques strongly depends on the algorithmic complexity. Consider a cloud-radio access network (CRAN), where the central cloud is responsible for scheduling devices to the frames’ radio resources blocks (RRBs) of the single-antenna base-stations (BSs), adjusting the transmit power levels, and for synchronizing the transmit frames across the connected BSs. Previous studies show that the jointly coordinated scheduling and power control problem in the considered CRAN can be solved using an approach that scales exponentially with the number of BSs, devices, and RRBs, which makes the practical implementation infeasible for reasonably sized networks. This paper instead proposes a low-complexity solution to the problem, under the constraints that each device cannot be served by more than one BS but can be served by multiple RRBs within each BS frame, and under the practical assumption that the channel is constant during the duration of each frame. The paper utilizes graph-theoretical based techniques and shows that constructing a single power control graph is sufficient to obtain the optimal solution with a complexity that is independent of the number of RRBs. Simulation results reveal the optimality of the proposed solution for slow-varying channels, and show that the solution performs near-optimal for highly correlated channels.

Item Type:Article
Related URLs:
URLURL TypeDescription
Douik, Ahmed0000-0001-7791-9443
Dahrouj, Hayssam0000-0002-0737-6372
Al-Naffouri, Tareq Y.0000-0001-6955-4720
Alouini, Mohamed-Slim0000-0003-4827-1793
Additional Information:© 2017 IEEE. Manuscript received June 6, 2017; accepted July 2, 2017. Date of publication July 17, 2017; date of current version October 7, 2017. Hayssam Dahrouj would like to thank Effat University in Jeddah, Saudi Arabia, for funding the research reported in this paper through the Research and Consultancy Institute. The associate editor coordinating the review of this paper and approving it for publication was D. W. K. Ng. (Corresponding author: Ahmed Douik.)
Funding AgencyGrant Number
Effat UniversityUNSPECIFIED
Subject Keywords:Joint scheduling and power adaptation, slowvarying channels, complexity reduction
Issue or Number:10
Record Number:CaltechAUTHORS:20170719-165125176
Persistent URL:
Official Citation:A. Douik, H. Dahrouj, T. Y. Al-Naffouri and M. S. Alouini, "Low-Complexity Scheduling and Power Adaptation for Coordinated Cloud-Radio Access Networks," in IEEE Communications Letters, vol. 21, no. 10, pp. 2298-2301, Oct. 2017. doi: 10.1109/LCOMM.2017.2728009
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:79215
Deposited By: Kristin Buxton
Deposited On:20 Jul 2017 19:10
Last Modified:09 Mar 2020 13:18

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