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Abstract
In a non-orthogonal multiple access (NOMA) environment, an Internet of Things (IoT) device achieves a high data rate by increasing its transmission power. However, excessively high transmission power can cause an energy outage of an IoT device and have a detrimental effect on the signal-to-interference-plus-noise ratio of neighbor IoT devices. In this paper, we propose a neighbor-aware NOMA scheme (NA-NOMA) where each IoT device determines whether to transmit data to the base station and the transmission power at each time epoch in a distributed manner with the consideration of its energy level and other devices’ transmission powers. To maximize the aggregated data rate of IoT devices while keeping an acceptable average energy outage probability, a constrained stochastic game model is formulated, and the solution of the model is obtained using a best response dynamics-based algorithm. Evaluation results show that NA-NOMA can increase the average data rate up to compared with a probability-based scheme while providing a sufficiently low energy outage probability (e.g., ).
Highlights
Internet of Things (IoT) devices have a limited battery capacity [1], which is one of the characteristic drawbacks of IoT systems
The contributions of this paper are as follows: (1) we optimize the policy on the transmission of IoT devices to maximize the aggregated data rate of IoT devices while keeping an acceptable average energy outage probability under the energy harvesting non-orthogonal multiple access (NOMA) environment; (2) the optimal transmission policy can be achieved with small overhead, and the proposed scheme can achieve the optimal performance in practical systems; (3) we evaluate the proposed scheme under diverse environments, which can give useful guidelines to design energy harvesting and NOMA-based IoT systems
This paper proposes neighbor-aware NOMA scheme (NA-NOMA) where each IoT device considers its energy level and other devices’ transmission powers to decide its transmission policy
Summary
Internet of Things (IoT) devices have a limited battery capacity [1], which is one of the characteristic drawbacks of IoT systems. To overcome this drawback, many researchers have focused on the use of energy harvesting [2,3,4]. BS can retrieve the desired signals using the received power difference and some signal processing techniques (e.g., successive interference cancellation). In the code-domain-based NOMA, different IoT devices use distinct codes, and they are multiplexed over the same frequency. For the power-domain-based NOMA, at the receiver side (i.e., BS), the only simple multiuser detection algorithm such as successive interference cancellation is needed. We consider the power-domain-based NOMA in this paper
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