TY - JOUR
T1 - User Association and Resource Allocation in Unified NOMA Enabled Heterogeneous Ultra Dense Networks
AU - Qin, Zhijin
AU - Yue, Xinwei
AU - Liu, Yuanwei
AU - Ding, Zhiguo
AU - Nallanathan, Arumugam
N1 - Publisher Copyright:
© 1979-2012 IEEE.
PY - 2018/6
Y1 - 2018/6
N2 - Heterogeneous ultra dense networks (HUDNs) and non-orthogonal multiple access (NOMA) have been identified as two proposing techniques for 5G mobile communication systems due to their great capabilities to enhance spectrum efficiency. This article investigates the application of NOMA techniques in HUDNs to support massive connectivity in 5G systems. In particular, a unified NOMA framework is proposed, including power-domain NOMA and code-domain NOMA, which can be configured flexibly to serve different application scenarios. As a further advance, unified NOMA framework enabled HUDNs are further investigated, with particular focus on user association and resource allocation. Two case studies are provided for demonstrating the effectiveness of unified NOMA enabled HUDNs. Finally, some main challenges and promising research directions in NOMA enabled HUDNs are identified.
AB - Heterogeneous ultra dense networks (HUDNs) and non-orthogonal multiple access (NOMA) have been identified as two proposing techniques for 5G mobile communication systems due to their great capabilities to enhance spectrum efficiency. This article investigates the application of NOMA techniques in HUDNs to support massive connectivity in 5G systems. In particular, a unified NOMA framework is proposed, including power-domain NOMA and code-domain NOMA, which can be configured flexibly to serve different application scenarios. As a further advance, unified NOMA framework enabled HUDNs are further investigated, with particular focus on user association and resource allocation. Two case studies are provided for demonstrating the effectiveness of unified NOMA enabled HUDNs. Finally, some main challenges and promising research directions in NOMA enabled HUDNs are identified.
UR - http://www.scopus.com/inward/record.url?scp=85048807851&partnerID=8YFLogxK
U2 - 10.1109/MCOM.2018.1700497
DO - 10.1109/MCOM.2018.1700497
M3 - Article
AN - SCOPUS:85048807851
SN - 0163-6804
VL - 56
SP - 86
EP - 96
JO - IEEE Communications Magazine
JF - IEEE Communications Magazine
IS - 6
ER -