###### Abstract
The Ministry has a great interest in generating more state income from the telecommunications sector, which accounted for 5.17% of the total Indonesian gross domestic product (GDP) in 2019 [3]. The current formula for calculating Indonesian spectrum usage fees is determined by the three following main parameters: the frequency band, the country's economic parameters, and the nationwide population. The formula has been applied since 2010, primarily to calculate fees for the usage of 2G, 3G, and 4G network spectrums. As 2G, 3G, and 4G are intended to only provide data communication services, the current formula simply takes into account the population size without considering the area, whether in residential, commercial, or industrial zones. Previous studies on spectrum usage fees may be found in [4; 5; 6], which look at how such fees are calculated for service operators (2G/3G) in Taiwan and Indonesia. These countries' formulas differ based on various factors, including rivalry among service providers, geographic location, population, bandwidth, and expected government income from spectrum usage fees, among others. However, these studies have not discussed a spectrum usage fee that uses technology to access an mmWave frequency band with extensive bandwidth and a limited distance. In other studies [7; 8; 9; 10], the authors only compare different pricing methods for private LTE and 5G networks using Finland as an example country, but with a narrowband bandwidth (10 MHz) and mid-band frequency (3.5 GHz). The present study only discusses spectrum usage fees for technologies that use mid-band frequencies (3.5 GHz) with limited bandwidth (10 MHz) and the national population. In contrast, 5G will be optimally used with a minimum bandwidth of around 100 MHz mmWave as a use case for industrial areas with a limited coverage area and limited population. The current formula does not work well for calculating 5G-mmWave private network spectrum usage fees. Because the spectrum usage fee is proportional to the large bandwidth and uses the national population, the current formula would result in an excessive price when applied to 5G-mmWave private networks (26-28 GHz), which require a bandwidth of about 100 MHz. From a technical perspective, the deployment cost is increased as a transmitter station for 5G-mmWave private networks covers a very small area or has limited coverage and may only serve a specific population. In the end, such a condition may endanger the financial balance of the 5G-mmWave private network service operator. However, there is a potential advantage to using 5G-mmWave as a private network in industrial areas. Private networks rely on 5G-mmWave to provide more limited coverage, providing an ideal technological platform for a factory's operation and production line. Service operators may utilize such an opportunity to create a 5G-mmWave private network, making it a new source of state income. This state income will also help increase the output of the national economy over the next few years [11]. For this reason, Indonesia needs a new formula for spectrum usage fees that would result in a more financially acceptable and affordable 5G-mmWave private network service operator. This paper proposes a new formula for calculating the spectrum usage fee for mmWave spectrum implementation in industrial areas. The main basis for developing the proposed new formula is by adopting the Indonesia Industry Readiness Index 4.0 (INDI 4.0) score for five industrial sectors prioritized in Indonesia. After considering this factor, we also take into account the number of workers in the industry and combine them with the ITU-R SM.2012-5 (06/2016) framework. We test the proposal by applying the new formula to the Jakarta industrial area, assuming that 5G-mmWave would be deployed as a private network serving two industrial areas: Pulogadung and Kawasan Berikat Nusantara (KBN). It is found that the proposed new formula is advantageous in that the fee would always be lower than that given by the current formula.