Three-Stage DRX Scheduling for Joint Downlink Transmission in C-RAN

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

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

5 Scopus citations


Cloud-RAN (C-RAN) is a promising network architecture to provide 5G broadband services. In C-RAN, the base stations (BSs) are separated as the computation entities (i.e., Baseband Units (BBUs)) and the radio entities (i.e., Remote Radio Heads (RRHs)), where the BBUs are put in a centralized cloud to realize centrally control and the RRH are left at cell sites for signal transmission. With C-RAN, multiple collaborative cells can transmit data to user equipments (UEs) by Joint Transmission (JT) technology to improve network efficiency. On the other hand, 3GPP standard has defined the Discontinuous Reception (DRX) mechanism, which allows UEs to turn off their radio interfaces periodically to save their energy. However, how to cooperate DRX with JT under the C-RAN architecture is still an open issue. Therefore, this letter studies how to optimize UEs' DRX parameters while considering their quality-of-service (QoS) in C-RAN with JT. To solve this problem, we propose an energy-efficient JT scheduling scheme. The main idea of our scheme is to well pair UEs and BSs with the consideration of joint transmission quality and then optimizes DRX parameters to further save energy. Extensive simulation results show that our scheme can improve system throughput, well utilize resource and save UEs' energy consumption.

Original languageEnglish
Article number8847450
Pages (from-to)129-133
Number of pages5
JournalIEEE Wireless Communications Letters
Issue number2
StatePublished - 01 02 2020

Bibliographical note

Publisher Copyright:
© 2012 IEEE.


  • 5G mobile system
  • cloud radio access networks (C-RAN)
  • discontinuous reception (DRX)
  • joint transmission (JT)
  • sleep scheduling


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