NDLI: Optimising energy efficiency of non-orthogonal multiple access for wireless backhaul in heterogeneous cloud radio access network

Content Provider	IET Digital Library
Author	Vien, Quoc Tuan Le, Tuan Anh Barn, Balbir Phan, Ca V.
Abstract	The downlink problem of a cloud-based central station (CCS) to multiple base stations (BSs) in a heterogeneous cloud radio access network (HCRAN) sharing the same time and frequency resources is studied. The authors adopt nonorthogonal multiple access (NOMA) and propose power allocation for the wireless downlink in the HCRAN. Taking into account practical channel modelling with power consumptions at BSs of different cell types (e.g. macrocell, micro-cell etc.) and backhauling power, they analyse the energy efficiency (EE) of the practical HCRAN utilising NOMA. Simulation results indicate that the proposed NOMA for the HCRAN outperforms the conventional orthogonal frequency division multiple access scheme in terms of providing higher EE of up to four times. Interestingly, the results reveal a fact that the EE of the NOMA varies as a quasi-concave function. An optimisation problem is accordingly introduced to find the optimal number of BSs that maximises the EE of the HCRAN. It is shown that, with a low power supply at the CCS, a double number of micro BSs can be served providing an improved EE of up to 1.6 times compared with the macro BSs and remote radio heads, while they achieve the same EE performance with high-power CCS.
Starting Page	2516
Ending Page	2524
Page Count	9
ISSN	17518628
Volume Number	10
e-ISSN	17518636
Issue Number	Issue 18, Dec (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/10/18
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2016.0247
Journal	IET Communications
Publisher Date	2016-12-15
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Cellular Radio Channel Modelling Cloud Computing Cloud-based Central Station Concave Programming Energy Conservation HCRAN EE Maximisation Heterogeneous Cellular Network Heterogeneous Cloud Radio Access Network High-power CCS Mobile Radio System Multi-access System Multiple Access Communication Multiple Base Station NOMA Approach Nonorthogonal Multiple Access Energy Efficiency Optimisation Optimisation Technique Power Allocation Power Consumption Quasiconcave Function Radio Access Network Radio Access System Resource Sharing Telecommunication Power Management Wireless Backhaul Wireless Channel Wireless Downlink
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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