Joint Load Balancing and Interference Mitigation in 5G Heterogeneous Networks

We study the problem of joint load balancing and interference mitigation in heterogeneous networks in which massive multiple-input multiple-output macro cell base station (BS) equipped with a large number of antennas, overlaid with wireless self-backhauled small cells (SCs), is assumed. Self-backhau...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2017-09, Vol.16 (9), p.6032-6046
Main Authors: Trung Kien Vu, Bennis, Mehdi, Samarakoon, Sumudu, Debbah, Merouane, Latva-aho, Matti
Format: Article
Language:English
Subjects:
5G mobile communication
Engineering Sciences
full-duplex
imperfect CSI
Interference
Load management
Massive MIMO
MIMO
mm-wave communications
non-convex optimization
random matrix theory
self-backhaul
Transmitting antennas
ultra dense small cells
Wireless communication
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Summary:We study the problem of joint load balancing and interference mitigation in heterogeneous networks in which massive multiple-input multiple-output macro cell base station (BS) equipped with a large number of antennas, overlaid with wireless self-backhauled small cells (SCs), is assumed. Self-backhauled SC BSs with full-duplex communication employing regular antenna arrays serve both macro users and SC users by using the wireless backhaul from macro BS in the same frequency band. We formulate the joint load balancing and interference mitigation problem as a network utility maximization subject to wireless backhaul constraints. Subsequently, leveraging the framework of stochastic optimization, the problem is decoupled into dynamic scheduling of macro cell users, backhaul provisioning of SCs, and offloading macro cell users to SCs as a function of interference and backhaul links. Via numerical results, we show the performance gains of our proposed framework under the impact of SCs density, number of BS antennas, and transmit power levels at low and high frequency bands. It is shown that our proposed approach achieves a 5.6 times gain in terms of cell-edge performance as compared with the closed-access baseline in ultra-dense networks with 350 SC BSs per km 2 .
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2017.2718504