Enhanced scheduling schemes with energy conservation for dynamic point selection in cloud radio access networks

Ching Kuo Hsu, Jia Ming Liang*, Kun Ru Wu, Jen-Jee Chen, Yu-Chee Tseng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In 5G mobile communications, Cloud-RAN (C-RAN) (Camps-Mur et al. in IEEE Commun Mag 57:99–105, 2019) is proposed to provide broadband services. It separates computation entities, i.e., baseband units (BBUs), from base stations and puts all BBUs in a centralized cloud. Existing researches have investigated how to enhance user equipments (UEs) to receive data from multiple collaborative cells by leveraging the dynamic point selection(DPS) technology. Collaborative transmission may cause higher energy consumption for UEs. Although 3GPP has defined the discontinuous reception (DRX) mechanism by regulating UEs to turn off their radio interfaces in a periodical manner, how to well coordinate DRX with DPS under the C-RAN architecture is still left as an open issue. This paper is the first one addressing this resource optimization problem in C-RAN with DPS, which asks how to optimize DRX parameters of UEs by considering their quality-of-service (QoS). We prove this problem to be NP-complete, and then propose two effective and efficient DPS solutions, called serving-ratio(SR) scheme and cost-aware (CA) scheme. SR serves UEs based on a special ‘serving ratio’ to ensure UEs receiving continuous subframes, especially for those in cell intersections. On the other hand, CA exploits the strategies of minimal scheduling costs to balance energy and throughput efficiency in a perspective way. Extensive simulation results validate that our schemes can successfully achieve higher system throughput, provide better resource utilization, and serve more UEs while guaranteeing their QoS and saving considerable energy as compared to existing schemes.

Original languageEnglish
Pages (from-to)1519-1534
Number of pages16
JournalWireless Networks
Volume26
Issue number2
DOIs
StatePublished - Feb 2020

Keywords

  • 5G
  • Cloud radio access network (C-RAN)
  • Discontinuous reception (DRX)
  • Dynamic point selection (DPS)
  • Power saving
  • Sleep scheduling

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