Subcarrier Assignment and Power Allocation for Preference-Aware Multicast Services in Active Array Aided LTE Networks

Mingli CHU
Qinghai YANG
Kyung Sup KWAK

IEICE TRANSACTIONS on Communications   Vol.E99-B    No.6    pp.1371-1379
Publication Date: 2016/06/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2015EBP3263
Type of Manuscript: PAPER
Category: Antennas and Propagation
active antenna,  multicast services,  video preference,  resource allocation,  

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In this paper, we investigate a preference-aware multicast mechanism in active array aided LTE (Long Term Evolution) networks. An active antenna system can direct vertical beams in different horizontal and vertical directions, so the amount of energy delivered is more concentrated on the target users. The active array provides each multicast group with an individual beam with specific downtilt delivering shared video to all users in the group. For the multicast system, the objective of our proposed resource allocation scheme is to maximize the total throughput, subject to the constraints of power, subcarrier and antenna downtilt, as well as horizontal angles and the vertical half power bandwidth. To solve the problem, individual beams are steered for multicast groups. Furthermore, a novel subcarrier assignment scheme is proposed to enhance the spectrum resource utilization, and the optimal power allocation is obtained by virtue of Lagrangian method. Simulation results demonstrate the throughput and the spectral efficiency enhancement of our proposed scheme over other conditional schemes.