Joint Design of Fronthaul and Access Links for C-RAN With Wireless Fronthauling

Seok Hwan Park, Kyoung Jae Lee, Changick Song, Inkyu Lee

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

This letter studies a joint design of fronthaul and radio access links for a cloud radio access network (C-RAN) with wireless fronthauling, where a baseband unit (BBU) controls a number of remote radio heads (RRHs) via wireless fronthaul links to communicate with user equipments. We first review a basic approach based on a single cell concept, whereby the RRHs operate as decode-and-forward (DF) relays. Then, a cooperative transmission from the RRHs based on decompress-and-forward (DCF) relaying is proposed, which is a standard concept in C-RAN. For both strategies, a problem of jointly optimizing the BBU and RRH operations is tackled with the goal of maximizing the weighted sum-rate subject to the BBU and per-RRH power constraints. For each formulated problem, an iterative algorithm is derived that achieves a sequence of monotonically nondecreasing objective values at each iteration. It is confirmed via numerical results that the DCF-based cooperative scheme significantly outperforms the DF-based single-cell approach.

Original languageEnglish
Pages (from-to)1657-1661
Number of pages5
JournalIEEE Signal Processing Letters
Volume23
Issue number11
DOIs
Publication statusPublished - 2016 Nov

Keywords

  • C-RAN
  • compress-and-forward
  • decode-and-forward
  • wireless fronthaul

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering
  • Applied Mathematics

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