Large-scale cloud radio access networks: Fundamental asymptotic analysis

Kyung Jun Choi, Kwang Soon Kim

Research output: Contribution to journalArticlepeer-review


Large-scale cloud radio access network (LS-CRAN) is a highly promising next-generation cellular network architecture whereby many base stations (BSS) equipped with a massive antenna array are connected to a cloud-computing based central processor unit via digital front/backhaul links. This paper studies the asymptotic behavior of downlink (DL) performance of a LS-CRAN. As an asymptotic performance measure, the scaling exponent of the signal-to-interference-plus-noise-ratio (SINR) is derived for interference-free (IF), maximum-ratio transmission (MRT), and zero-forcing (ZF) operations. Our asymptotic analysis reveals four fundamental operating regimes and the performances of both MRT and ZF operations are fundamentally limited by the UL transmit power for estimating user's channel state information, not the DL transmit power. We obtain the conditions that MRT or ZF operation becomes interference-free, i.e., order-optimal. As higher UL transmit power is provided, more users can be associated and the data rate per user can be increased simultaneously while keeping the order-optimality.

Original languageEnglish
Article number8697899
Pages (from-to)85-99
Number of pages15
JournalJournal of Communications and Networks
Issue number2
Publication statusPublished - 2019 Apr

Bibliographical note

Funding Information:
This work was supported in part by ICT R&D program of MSIT/IITP {2014-0-00552, Next Generation WLAN System with High Efficient Performance, and 2018-0-00923, Scalable Spectrum Sensing for Beyond 5G Communication}, and in part by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2014R1A2A2A01007254, NRF-2015K2A3A1000189).

Publisher Copyright:
© 2019 KICS.

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Computer Networks and Communications


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