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Mobile Information Systems
Volume 2016 (2016), Article ID 3973287, 9 pages
Research Article

On Novel Access and Scheduling Schemes for IoT Communications

China Telecom Beijing Information Science and Technology Innovation Park, Southern Zone of Future Science and Technology City, Beiqijia Town, Changping District, Beijing 102209, China

Received 17 June 2016; Revised 2 November 2016; Accepted 10 November 2016

Academic Editor: Jose M. Barcelo-Ordinas

Copyright © 2016 Zheng Jiang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The Internet of Things (IoT) is expected to foster the development of 5G wireless networks and requires the efficient support for a large number of simultaneous short message communications. To address these challenges, some existing works utilize new waveform and multiuser superposition transmission schemes to improve the capacity of IoT communication. In this paper, we will investigate the spatial degree of freedom of IoT devices based on their distribution, then extend the multiuser shared access (MUSA) which is one of the typical MUST schemes to spatial domain, and propose two novel schemes, that is, the preconfigured access scheme and the joint spatial and code domain scheduling scheme, to enhance IoT communication. The results indicate that the proposed schemes can reduce the collision rate dramatically during the IoT random access procedure and improve the performance of IoT communication obviously. Based on the simulation results, it is also shown that the proposed scheduling scheme can achieve the similar performance to the corresponding brute-force scheduling but with lower complexity.