A Novel Joint Precoding and Association Optimization Framework for C-RANs with Restricted Fronthauls


A. Zamani, O. Taghizadeh, A. Schmeink,


        Joint optimization of associations and precoders in wireless communication networks has become a crucial problem,due to the growing density of network infrastructure and users.Furthermore, network operators continue to show interest in improved energy efficiency and less power consumption. Due to the non-convex structure of the joint optimization problem, current methods and solvers struggle to offer satisfactory solutions. In the present paper, we provide a novel approach for joint optimization of the precoders and associations in a cooperative network with limited fronthaul capacity links. The proposed method provides an approximation of the original problem in the form of a mixed integer quadratic program (MIQP), solved via off the shelf numerical solvers. The second contribution of our work is a distributed hybrid association strategy, which serves as an alternative to the centralized MIQP approximation method. The performance of both methods is evaluated, suggesting that the proposed MIQP approximation framework can be used as a benchmark for other heuristic methods,due to its better performance and higher complexity. Meanwhile,the hybrid association strategy is deemed suitable for a distributed implementation in less computationally advanced networks.

BibTEX Reference Entry 

	author = {Alireza Zamani and Omid Taghizadeh and Anke Schmeink},
	title = "A Novel Joint Precoding and Association Optimization Framework for {C-RANs} with Restricted Fronthauls",
	booktitle = "22nd International ITG Workshop on Smart Antennas (WSA 2018)",
	address = {Bochum, Germany},
	month = Mar,
	year = 2018,
	hsb = RWTH-2018-225792,


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