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Functional Split of Zero-Forcing Based Massive MIMO for Fronthaul Load Reduction

Huang, Yezi LU ; Lu, Chenguang; Berg, Miguel LU and Odling, Per LU (2018) In IEEE Access 6. p.6350-6359
Abstract

The evolution towards centralized radio access network (C-RAN) for 5G is driven by the need for improved network performance and reduced total-cost-of-ownership (TCO). In CRAN, physically separated remote radio units (RRUs) and baseband units (BBUs) are connected via fronthaul (FH) links, which are capacity constrained. When base-station antennas are upgraded to support massive MIMO techniques, an intra PHY split between RRU and BBU becomes favorable to avoid the dramatic rate growth on the FH links. In this paper, we present a new uplink functional split alternative that decomposes the massive MIMO processing, on the basis of zero-forcing (ZF) equalization, into two phases: dimension-reduction phase and interference cancellation phase,... (More)

The evolution towards centralized radio access network (C-RAN) for 5G is driven by the need for improved network performance and reduced total-cost-of-ownership (TCO). In CRAN, physically separated remote radio units (RRUs) and baseband units (BBUs) are connected via fronthaul (FH) links, which are capacity constrained. When base-station antennas are upgraded to support massive MIMO techniques, an intra PHY split between RRU and BBU becomes favorable to avoid the dramatic rate growth on the FH links. In this paper, we present a new uplink functional split alternative that decomposes the massive MIMO processing, on the basis of zero-forcing (ZF) equalization, into two phases: dimension-reduction phase and interference cancellation phase, which are implemented in RRU and BBU respectively. Compared with the traditional C-RAN architecture having all baseband processing in the BBU, the new scheme largely alleviates the FH load by reducing the number of FH streams to be equal to the number of MIMO user layers. Compared with an existing split that places all MIMO processing in RRU, the new scheme reduces the RRU complexity without compromising the post-processing performances.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
dimension reduction, Fronthaul, functional split, massive MIMO, zero-forcing
in
IEEE Access
volume
6
pages
6350 - 6359
publisher
IEEE--Institute of Electrical and Electronics Engineers Inc.
external identifiers
  • scopus:85040032285
ISSN
2169-3536
DOI
10.1109/ACCESS.2017.2788451
language
English
LU publication?
yes
id
d69e764d-2160-4f4c-a004-1ffbcab1606f
date added to LUP
2018-01-15 10:14:20
date last changed
2019-03-19 03:47:32
@article{d69e764d-2160-4f4c-a004-1ffbcab1606f,
  abstract     = {<p>The evolution towards centralized radio access network (C-RAN) for 5G is driven by the need for improved network performance and reduced total-cost-of-ownership (TCO). In CRAN, physically separated remote radio units (RRUs) and baseband units (BBUs) are connected via fronthaul (FH) links, which are capacity constrained. When base-station antennas are upgraded to support massive MIMO techniques, an intra PHY split between RRU and BBU becomes favorable to avoid the dramatic rate growth on the FH links. In this paper, we present a new uplink functional split alternative that decomposes the massive MIMO processing, on the basis of zero-forcing (ZF) equalization, into two phases: dimension-reduction phase and interference cancellation phase, which are implemented in RRU and BBU respectively. Compared with the traditional C-RAN architecture having all baseband processing in the BBU, the new scheme largely alleviates the FH load by reducing the number of FH streams to be equal to the number of MIMO user layers. Compared with an existing split that places all MIMO processing in RRU, the new scheme reduces the RRU complexity without compromising the post-processing performances.</p>},
  author       = {Huang, Yezi and Lu, Chenguang and Berg, Miguel and Odling, Per},
  issn         = {2169-3536},
  keyword      = {dimension reduction,Fronthaul,functional split,massive MIMO,zero-forcing},
  language     = {eng},
  pages        = {6350--6359},
  publisher    = {IEEE--Institute of Electrical and Electronics Engineers Inc.},
  series       = {IEEE Access},
  title        = {Functional Split of Zero-Forcing Based Massive MIMO for Fronthaul Load Reduction},
  url          = {http://dx.doi.org/10.1109/ACCESS.2017.2788451},
  volume       = {6},
  year         = {2018},
}