Abstract
Non-orthogonal multiple access is an essential promising solution to support large-scale connectivity required by massive machine-type communication scenario defined in the fifth generation (5G) mobile communication system. In this article, we study the problem of energy minimization in non-orthogonal multiple access–based massive machine-type communication network. Focusing on the massive machine-type communication scenario and assisted by grouping method, we propose an uplink cooperative non-orthogonal multiple access scheme with two phases, transmission phase and cooperation phase, for one uplink cooperative transmission period. Based on uplink cooperative non-orthogonal multiple access, the machine-type communication device with better channel condition and more residual energy will be selected as a group head, which acts as a relay assisting other machine-type communication devices to communicate. In the transmission phase, machine-type communication devices transmit data to the group head. Then, the group head transmits the received data with its own data to base station in the cooperation phase. Because the massive machine-type communication devices are low-cost dominant with limited battery, based on uplink cooperative non-orthogonal multiple access, we propose a joint time and power allocation algorithm to minimize the system energy consumption. Furthermore, the proposed joint time and power allocation algorithm includes dynamic group head selection and fractional transmit time allocation algorithms. Simulation results show that the proposed solution for uplink cooperative non-orthogonal multiple access–based massive machine-type communication network outperforms other schemes.
Highlights
The deployment scenarios of the fifth generation (5G) system are grouped into three general categories: enhanced mobile broadband, ultra-reliable and low latency communications, and massive machine-type communications
The main contributions of this article are summarized as follows: 1. Exploiting the characteristic of NOMA technique that multiple machine-type communication devices (MTCDs) share the same subcarrier at the same time with different power levels, we propose an uplink cooperative nonorthogonal multiple access (UC-NOMA) scheme for massive machine-type communications (mMTC) networks
The system model based uplink NOMA is described in section ‘‘System model.’’ The proposed dynamic group head selection and fractional transmission time allocation scheme are introduced in section ‘‘Joint Time and Power Allocation in UC-NOMA.’’ Section ‘‘Performance evaluations’’ provides the performance simulation results and section ‘‘Conclusion’’ concludes the article
Summary
The deployment scenarios of the fifth generation (5G) system are grouped into three general categories: enhanced mobile broadband, ultra-reliable and low latency communications, and massive machine-type communications (mMTC). Based on UC-NOMA, we propose a joint time and power allocation (JTPA) algorithm to minimize the system energy consumption, including dynamic group head selection and fractional transmit time allocation algorithms. 3. Based on UC-NOMA, we propose the JTPA algorithm to minimize the energy consumption and prolong the lifetime of massive MTCDs. The dynamic group head selection and fractional transmission time allocation schemes are designed. The system model based uplink NOMA is described in section ‘‘System model.’’ The proposed dynamic group head selection and fractional transmission time allocation scheme are introduced in section ‘‘Joint Time and Power Allocation in UC-NOMA.’’ Section ‘‘Performance evaluations’’ provides the performance simulation results and section ‘‘Conclusion’’ concludes the article
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
