Optimization of the energy-efficient relay-based massive IoT network

Tiejun Lv*, Zhipeng Lin, Pingmu Huang, Jie Zeng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

To meet the requirements of high energy efficiency (EE) and large system capacity for the fifth-generation Internet of Things (IoT), the use of massive multiple-input multiple-output technology has been launched in the massive IoT (mIoT) network, where a large number of devices are connected and scheduled simultaneously. This paper considers the energy-efficient design of a multipair decode-and-forward relay-based IoT network, in which multiple sources simultaneously transmit their information to the corresponding destinations via a relay equipped with a large array. In order to obtain an accurate yet tractable expression of the EE, first, a closed-form expression of the EE is derived under an idealized simplifying assumption, in which the location of each device is known by the network. Then, an exact integral-based expression of the EE is derived under the assumption that the devices are randomly scattered following a uniform distribution and transmit power of the relay is equally shared among the destination devices. Furthermore, a simple yet efficient lower bound of the EE is obtained. Based on this, finally, a low-complexity energy-efficient resource allocation strategy of the mIoT network is proposed under the specific quality-of-service constraint. The proposed strategy determines the near-optimal number of relay antennas, the near-optimal transmit power at the relay, and near-optimal density of active mIoT device pairs in a given coverage area. Numerical results demonstrate the accuracy of the performance analysis and the efficiency of the proposed algorithms.

Original languageEnglish
Pages (from-to)3043-3058
Number of pages16
JournalIEEE Internet of Things Journal
Volume5
Issue number4
DOIs
Publication statusPublished - Aug 2018
Externally publishedYes

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Lv, T., Lin, Z., Huang, P., & Zeng, J. (2018). Optimization of the energy-efficient relay-based massive IoT network. IEEE Internet of Things Journal, 5(4), 3043-3058. https://doi.org/10.1109/JIOT.2018.2829827