Fronthaul-constrained cloud radio access networks: Insights and challenges

Mugen Peng, Chonggang Wang, Vincent Lau, H. Vincent Poor

Research output: Contribution to journalArticle

245 Scopus citations

Abstract

As a promising paradigm for fifth generation wireless communication systems, cloud radio access networks (C-RANs) have been shown to reduce both capital and operating expenditures, as well as to provide high spectral efficiency (SE) and energy efficiency (EE). The fronthaul in such networks, defined as the transmission link between the baseband unit and the remote radio head, requires a high capacity, but is often constrained. This article comprehensively surveys recent advances in fronthaul-constrained CRANs, including system architectures and key techniques. Particularly, major issues relating to the impact of the constrained fronthaul on SE/EE and quality of service for users, including compression and quantization, large-scale coordinated processing and clustering, and resource allocation optimization, are discussed together with corresponding potential solutions. Open issues in terms of software-defined networking, network function virtualization, and partial centralization are also identified.

Original languageEnglish (US)
Article number7096298
Pages (from-to)152-160
Number of pages9
JournalIEEE Wireless Communications
Volume22
Issue number2
DOIs
StatePublished - Apr 1 2015

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering

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