Optimal remote radio head selection for cloud radio access networks  

作　　者：Chunguo LI Kang SONG Dongming WANG Fu-Chun ZHENG Luxi YANG 

机构地区：[1]National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China [2]School of Electronic and Information Engineering,Qingdao University, Qingdao 266071, China

出　　处：《Science China(Information Sciences)》2016年第10期206-217,共12页中国科学（信息科学）（英文版）

基　　金：supported by National Basic Research Program of China (973) (Grant Nos. 2012CB316004, 2013CB336600);National Natural Science Foundation of China (Grant Nos. 61372101, 61221002);National High Technology Research and Development Program of China (863) (Grant Nos. 2014AA012104);Fundamental Research Funds for the Central Universities and the Open Research Fund of Key Lab of Broadband Wireless Communications and Sensor Network Technologies (NJUPT), Ministry of Education (Grant No. NYKL201502);Funding of Supporting Excellent Young Professors for Teaching and Research in Southeast University.

摘　　要：The cloud radio access network （C-RAN） promises significant gain to the data rate over the LTE- advarmed by transferring the burdensome baseband signal processing from the remote radio heads （RRHs） to the baseband unit via the front-haul. However, scalable improvement of the overall throughput may not be maintained due to limited front-haul capacity. In this paper, we study the throughput maximization problem by selecting the active RRHs. In particular, we develop an optimum algorithm which selects a subset of active RRHs that maximize the system throughput under the front-haul constraint. In addition, the asymptotically optimum number of RRHs is derived in closed-form for low and high signal-to-noise ratio （SNR） regimes. It is demonstrated that the proposed RRH selection scheme outperforms any other existing schemes with substan- tial gain of achievable throughput for any given number of RRHs and any predetermined front-haul capacity constraints.The cloud radio access network （C-RAN） promises significant gain to the data rate over the LTE- advarmed by transferring the burdensome baseband signal processing from the remote radio heads （RRHs） to the baseband unit via the front-haul. However, scalable improvement of the overall throughput may not be maintained due to limited front-haul capacity. In this paper, we study the throughput maximization problem by selecting the active RRHs. In particular, we develop an optimum algorithm which selects a subset of active RRHs that maximize the system throughput under the front-haul constraint. In addition, the asymptotically optimum number of RRHs is derived in closed-form for low and high signal-to-noise ratio （SNR） regimes. It is demonstrated that the proposed RRH selection scheme outperforms any other existing schemes with substan- tial gain of achievable throughput for any given number of RRHs and any predetermined front-haul capacity constraints.

关 键 词：cloud radio access network （C-RAN） baseband unit （BBU） front-haul remote radio head （RRH） 

分 类 号：TN92[电子电信—通信与信息系统]