Coordinated Multipoint ( CoMP ) Transmission Design for Cloud-RANs with Limited Fronthaul Capacity Constraints

In this paper, we consider the coordinated multipoint (CoMP) transmission design for the downlink cloud radio access network (Cloud-RAN). Our design aims to optimize the set of remote radio heads (RRHs) serving each user and the precoding and transmission power to minimize the total transmission power while maintaining the fronthaul capacity and users' quality-of-service (QoS) constraints. The fronthaul capacity constraint involves a nonconvex and discontinuous function that renders the optimal exhaustive search method unaffordable for large networks. To address this challenge, we propose two low-complexity algorithms. The first pricing-based algorithm solves the underlying problem through iteratively tackling a related pricing problem while appropriately updating the pricing parameter. In the second iterative linear-relaxed algorithm, we directly address the fronthaul constraint function by iteratively approximating it with a suitable linear form using a conjugate function and solving the corresponding convex problem. For performance evaluation, we also compare our proposed algorithms with two existing algorithms in the literature. Finally, extensive numerical results are presented, which illustrate the convergence of our proposed algorithms and confirm that our algorithms significantly outperform the state-of-the-art existing algorithms.

[1]  Bjorn Ottersten,et al.  Optimal Downlink Beamforming Using Semidefinite Optimization , 2014 .

[2]  Dong In Kim,et al.  Interference management in OFDMA femtocell networks: issues and approaches , 2012, IEEE Wireless Communications.

[3]  Shlomo Shamai,et al.  Fronthaul Compression and Precoding Design for C-RANs Over Ergodic Fading Channels , 2014, IEEE Transactions on Vehicular Technology.

[4]  Zhongding Lei,et al.  Coordinated Multipoint Transmission with Limited Backhaul Data Transfer , 2013, IEEE Transactions on Wireless Communications.

[5]  David L Donoho,et al.  Compressed sensing , 2006, IEEE Transactions on Information Theory.

[6]  Mamoru Sawahashi,et al.  Coordinated multipoint transmission/reception techniques for LTE-advanced [Coordinated and Distributed MIMO] , 2010, IEEE Wireless Communications.

[7]  Ross D. Murch,et al.  A transmit preprocessing technique for multiuser MIMO systems using a decomposition approach , 2004, IEEE Transactions on Wireless Communications.

[8]  Zhisheng Niu,et al.  Joint Scheduling and Dynamic Clustering in Downlink Cellular Networks , 2011, 2011 IEEE Global Telecommunications Conference - GLOBECOM 2011.

[9]  Dusit Niyato,et al.  Radio Resource Management in Multi-Tier Cellular Wireless Networks: Hossain/Radio , 2013 .

[10]  Ekram Hossain,et al.  Radio Resource Management in Multi-Tier Cellular Wireless Networks , 2013 .

[11]  Julien Mairal,et al.  Optimization with Sparsity-Inducing Penalties , 2011, Found. Trends Mach. Learn..

[12]  Shlomo Shamai,et al.  Robust and Efficient Distributed Compression for Cloud Radio Access Networks , 2012, IEEE Transactions on Vehicular Technology.

[13]  Xiaojun Yuan,et al.  Dynamic Nested Clustering for Parallel PHY-Layer Processing in Cloud-RANs , 2016, IEEE Transactions on Wireless Communications.

[14]  Rui Zhang,et al.  Downlink and Uplink Energy Minimization Through User Association and Beamforming in C-RAN , 2014, IEEE Transactions on Wireless Communications.

[15]  Yong Cheng,et al.  Joint Network Optimization and Downlink Beamforming for CoMP Transmissions Using Mixed Integer Conic Programming , 2013, IEEE Transactions on Signal Processing.

[16]  Daniel Pérez Palomar,et al.  Rank-Constrained Separable Semidefinite Programming With Applications to Optimal Beamforming , 2010, IEEE Transactions on Signal Processing.

[17]  Vincent K. N. Lau,et al.  Joint Power and Antenna Selection Optimization in Large Cloud Radio Access Networks , 2013, IEEE Transactions on Signal Processing.

[18]  Stephen P. Boyd,et al.  Disciplined Convex Programming , 2006 .

[19]  Lars Thiele,et al.  Coordinated multipoint: Concepts, performance, and field trial results , 2011, IEEE Communications Magazine.

[20]  Wei Yu,et al.  Sparse Beamforming and User-Centric Clustering for Downlink Cloud Radio Access Network , 2014, IEEE Access.

[21]  Emmanuel J. Candès,et al.  Near-Optimal Signal Recovery From Random Projections: Universal Encoding Strategies? , 2004, IEEE Transactions on Information Theory.

[22]  Robert W. Heath,et al.  Cooperative Algorithms for MIMO Interference Channels , 2010, IEEE Transactions on Vehicular Technology.

[23]  Gerhard Fettweis,et al.  Uplink CoMP under a Constrained Backhaul and Imperfect Channel Knowledge , 2010, IEEE Transactions on Wireless Communications.

[24]  Sangkyu Park,et al.  Before/after precoded massive MIMO in cloud radio access networks , 2013, 2013 IEEE International Conference on Communications Workshops (ICC).

[25]  Sampath Rangarajan,et al.  The case for re-configurable backhaul in cloud-RAN based small cell networks , 2013, 2013 Proceedings IEEE INFOCOM.

[26]  Long Bao Le,et al.  Joint coordinated beamforming and admission control for fronthaul constrained cloud-RANs , 2014, 2014 IEEE Global Communications Conference.

[27]  Long Bao Le,et al.  Energy-efficient coordinated transmission for Cloud-RANs: Algorithm design and trade-off , 2014, 2014 48th Annual Conference on Information Sciences and Systems (CISS).

[28]  Shlomo Shamai,et al.  Robust Layered Transmission and Compression for Distributed Uplink Reception in Cloud Radio Access Networks , 2014, IEEE Transactions on Vehicular Technology.

[29]  Yuanming Shi,et al.  Group Sparse Beamforming for Green Cloud-RAN , 2013, IEEE Transactions on Wireless Communications.

[30]  L. C. Godara,et al.  Handbook of Antennas in Wireless Communications , 2001 .

[31]  Wei Yu,et al.  An introduction to convex optimization for communications and signal processing , 2006, IEEE Journal on Selected Areas in Communications.

[32]  Zhi-Quan Luo,et al.  Semidefinite Relaxation of Quadratic Optimization Problems , 2010, IEEE Signal Processing Magazine.

[33]  Jinsong Wu,et al.  Green wireless communications: from concept to reality [Industry Perspectives] , 2012, IEEE Wireless Communications.

[34]  Nicholas I. M. Gould,et al.  On the Complexity of Steepest Descent, Newton's and Regularized Newton's Methods for Nonconvex Unconstrained Optimization Problems , 2010, SIAM J. Optim..

[35]  Robert W. Heath,et al.  Spectral Efficiency of Dynamic Coordinated Beamforming: A Stochastic Geometry Approach , 2015, IEEE Transactions on Wireless Communications.

[36]  Khaled Ben Letaief,et al.  A joint-channel diagonalization for multiuser MIMO antenna systems , 2003, IEEE Trans. Wirel. Commun..

[37]  Tho Le-Ngoc,et al.  Enabling 5G mobile wireless technologies , 2015, EURASIP Journal on Wireless Communications and Networking.

[38]  Michael S. Berger,et al.  Evaluation of energy and cost savings in mobile Cloud RAN , 2013 .