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Boosting fronthaul capacity: Global optimization of power sharing for centralized radio access network

Boosting fronthaul capacity: Global optimization of power sharing for centralized radio access network
Boosting fronthaul capacity: Global optimization of power sharing for centralized radio access network
The limited fronthaul capacity imposes a challenge on the uplink of centralized radio access network (C-RAN). We propose to boost the fronthaul capacity of massive multiple-input multiple-output (MIMO) aided C-RAN by globally optimizing the power sharing between channel estimation and data transmission both for the user equipments (UEs) and the remote radio units (RRUs). Intuitively, allocating more power to the channel estimation will result in more accurate channel estimates, which increases the achievable throughput. However, increasing the power allocated to the pilot training will reduce the power assigned to data transmission, which reduces the achievable throughput. In order to optimize the powers allocated to the pilot training and to the data transmission of both the UEs and the RRUs, we assign a specific power sharing factor to each of them and derive an asymptotic closed-form expression of the signal-to-interference-plus-noise for the massive MIMO aided C-RAN consisting of both the UE-to-RRU links and the RRU-to-baseband unit (BBU) links. We then exploit the C-RAN architecture's central computing and control capability for jointly optimizing the UEs' power sharing factors and the RRUs' power sharing factors aiming for maximizing the fronthaul capacity. Our simulation results show that the fronthaul capacity is significantly boosted by the proposed global optimization of the power sharing between channel estimation and data transmission both for the UEs and for their host RRUs.
0018-9545
1916-1929
Zhang, Jiankang
6add829f-d955-40ca-8214-27a039defc8a
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Guo, Xinying
4c93cc91-7ace-4d5d-989c-ff2803355fd1
Shi, Jia
592123d1-83e1-46ea-a158-619bb74a72d8
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Zhang, Jiankang
6add829f-d955-40ca-8214-27a039defc8a
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Guo, Xinying
4c93cc91-7ace-4d5d-989c-ff2803355fd1
Shi, Jia
592123d1-83e1-46ea-a158-619bb74a72d8
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Zhang, Jiankang, Chen, Sheng, Guo, Xinying, Shi, Jia and Hanzo, Lajos (2019) Boosting fronthaul capacity: Global optimization of power sharing for centralized radio access network. IEEE Transactions on Vehicular Technology, 68 (2), 1916-1929. (doi:10.1109/TVT.2018.2890640).

Record type: Article

Abstract

The limited fronthaul capacity imposes a challenge on the uplink of centralized radio access network (C-RAN). We propose to boost the fronthaul capacity of massive multiple-input multiple-output (MIMO) aided C-RAN by globally optimizing the power sharing between channel estimation and data transmission both for the user equipments (UEs) and the remote radio units (RRUs). Intuitively, allocating more power to the channel estimation will result in more accurate channel estimates, which increases the achievable throughput. However, increasing the power allocated to the pilot training will reduce the power assigned to data transmission, which reduces the achievable throughput. In order to optimize the powers allocated to the pilot training and to the data transmission of both the UEs and the RRUs, we assign a specific power sharing factor to each of them and derive an asymptotic closed-form expression of the signal-to-interference-plus-noise for the massive MIMO aided C-RAN consisting of both the UE-to-RRU links and the RRU-to-baseband unit (BBU) links. We then exploit the C-RAN architecture's central computing and control capability for jointly optimizing the UEs' power sharing factors and the RRUs' power sharing factors aiming for maximizing the fronthaul capacity. Our simulation results show that the fronthaul capacity is significantly boosted by the proposed global optimization of the power sharing between channel estimation and data transmission both for the UEs and for their host RRUs.

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FronthaulManu_accepted_v - Accepted Manuscript
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More information

Accepted/In Press date: 29 December 2018
e-pub ahead of print date: 1 January 2019
Published date: 12 February 2019

Identifiers

Local EPrints ID: 427104
URI: http://eprints.soton.ac.uk/id/eprint/427104
ISSN: 0018-9545
PURE UUID: 6689ea2c-beff-4c61-b3df-6e3919dee899
ORCID for Jiankang Zhang: ORCID iD orcid.org/0000-0001-5316-1711
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

Catalogue record

Date deposited: 03 Jan 2019 10:27
Last modified: 18 Feb 2021 17:13

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