Technical feasibility of direct satellite connection to terrestrial communication equipment and service provision in Iran

Document Type : Original Article

Authors
1 Satellite Communication Group, Faculty of Communications Technology, ICT Research Institute, Tehran, Iran
2 Radio Communication Group, Faculty of Communications Technology, ICT Research Institute, Tehran, Iran
Abstract
Direct satellite-to-Device is an efficient solution for complete coverage and enabling access, especially in areas outside the coverage of terrestrial telecommunications systems. Given the importance of this technology, the provision of experimental services, technical development, standardization, etc., is being carried out rapidly.

Therefore, analyzing and examining its various dimensions is necessary to adopt an appropriate approach to dealing with this technology in the country. In the meantime, identifying satellite systems that have the ability to provide this service within the territorial limits of Iran and assessing the technical feasibility of its exploitation is of particular importance, which is examined in this article. In this regard, seven satellite systems were initially considered. By considering the technical specifications of each of these systems, a comprehensive analysis and review of the link budget in a single satellite mode for providing two types of services (narrow band and broadband) was presented.

Then, by comparing the performance results of 7 satellite systems and based on the complementary analyses conducted for the city of Tehran, satellite systems suitable for providing this type of service were introduced and technical considerations such as the carrier-to-noise ratio (CNR) and the effect of increasing the number of satellites on increasing the number of accessible points were evaluated.
Keywords
Subjects

[1] A. Pastukh, V. Tikhvinskiy, O. Mironova, and V. Akhmediarov, “Analysis of the possibility to use hybrid satellite-terrestrial systems (direct-to-device) in the IMT bands of terrestrial cellular networks,” in Proc. Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO), pp. 1–6, 2024.
[2] L. Liu, Y. Li, H. Li, J. Yang, W. Liu, J. Lan, Y. Wang, J. Li, J. Wu, Q. Wu, and J. Liu, “Democratizing direct-to-cell low Earth orbit satellite networks,” in Proc. 21st USENIX Symposium on Networked Systems Design and Implementation (NSDI ’24), pp. 791–808, 2024.
[3] ITU, Measuring Digital Development: Facts and Figures 2022, 2022. [Online]. Available: https://www.itu.int/itu-d/reports/statistics/facts-figures-2022/
[4] L. Goldman, L. Palerm, and S. Piot, “SpaceX and T-Mobile focus on direct satellite-to-smartphone to improve mobile coverage in remote areas,” Analysys Mason, pp. 1–5, 2022. [Online]. Available: https://www.analysysmason.com/contentassets/d8d18fb0ac374c94b37e7d4424f50000/analysys_mason_spacex_tmobile_satellites_aug2022_rma18.pdf
[5] O. B. Yahia, Z. Garroussi, B. Sansò, J.-F. Frigon, S. Martel, A. Lesage-Landry, and G. K. Kurt, “A scalable architecture for future regenerative satellite payloads,” arXiv preprint arXiv:2407.06075, pp. 1–5, 2024.
[6] A. Pastukh, V. Tikhvinskiy, S. Dymkova, and O. Varlamov, “Challenges of using the L-band and S-band for direct-to-cellular satellite 5G-6G NTN systems,” Technologies, vol. 11, no. 4, pp. 1–18, 2023.
[7] A. Pastukh, E. Deviyatkin, A. Savochkin, and V. Tikhvinskiy, “Interference analysis of UWB devices to the satellite services in the 7240–8240 MHz frequency band,” Synchroinfo Journal, vol. 8, no. 3, pp. 2–6, 2022.
[8] D. Chivanov and S. Dymkova, “Impact of 5G network performance on users loyalty,” Synchroinfo Journal, vol. 10, no. 1, pp. 39–52, 2024.
[9] S. Dymkova, “Applicability of 5G subscriber equipment and global navigation satellite systems,” Synchroinfo Journal, vol. 7, no. 5, pp. 36–48, 2021.
[10] A. Pastukh, V. Tikhvinskiy, E. Devyatkin, and A. Kulakayeva, “Sharing studies between 5G IoT networks and fixed service in the 6425–7125 MHz band with Monte Carlo simulation analysis,” Sensors, vol. 22, no. 4, pp. 1–14, 2022.
[11] A. Pastukh, V. Tikhvinskiy, E. Devyatkin, and A. Kostin, “Interference analysis of 5G NR base stations to fixed satellite service bent-pipe transponders in the 6425–7125 MHz frequency band,” Sensors, vol. 23, no. 1, pp. 1–19, 2023.
[12] A. Pastukh, V. Tikhvinskiy, and E. Devyatkin, “Exploring interference issues in the case of n25 band implementation for 5G/LTE direct-to-device NTN services,” Sensors, vol. 24, no. 4, pp. 1–16, 2024.
[13] B. Daneshmand, “Comparative analysis of the concept of creation and development of 5G/IMT-2020 networks in Russia, China, USA and Europe,” T-Comm, vol. 15, no. 6, pp. 20–32, 2021.
[14] K. L. Jones and A. L. Allison, The Great Convergence and the Future of Satellite-Enabled Direct-to-Device, Aerospace Corporation, 2023. [Online]. Available: https://csps.aerospace.org/sites/default/files/2023-09/Jones_Allison_GreatConvergence_20230919.pdf
[15] N. K. Bhola, “Future spectrum studies for WRC-2027 based on outcomes of WRC-23,” 2024. [Online]. Available: https://iafi.in/learnings-from-wrc23-conference/presentation/4NKBhola.pdf
[16] Y. He, Y. Xiao, S. Zhang, M. Jia, and Z. Li, “Direct-to-smartphone for 6G NTN: Technical routes, challenges, and key technologies,” IEEE Network, vol. 38, no. 4, pp. 128–135, 2024.
[17] Global Satellite Operators Association, Satellite Direct-to-Device Connectivity: Bringing Connectivity to Everyone, Everywhere, Anytime, Nov. 2, 2023. [Online]. Available: https://gsoasatellite.com/wp-content/uploads/GSOA-D2D-Paper.pdf
[18] D. Tuzi, E. F. Aguilar, T. Delamotte, G. Karabulut-Kurt, and A. Knopp, “Distributed approach to satellite direct-to-cell connectivity in 6G non-terrestrial networks,” IEEE Wireless Communications, vol. 30, no. 6, pp. 28–34, 2023.
[19] S. Boumard, I. Moilanen, M. Lasanen, T. Suihko, and M. H. Hoyhtya, “A technical comparison of six satellite systems: Suitability for direct-to-device satellite access,” in Proc. 9th World Forum on Internet of Things (WF-IoT), pp. 1–6, 2023.
[20] Federal Communications Commission, DA 24-756, Washington, DC, USA, Aug. 2, 2024. [Online]. Available: https://docs.fcc.gov/public/attachments/DA-24-756A1.pdf
[21] “SpaceX Starlink has 227 direct to cellphone capable satellites,” NextBigFuture, Oct. 7, 2024. [Online]. Available: https://www.nextbigfuture.com/2024/10/spacex-starlink-has-227-direct-to-cellphone-capable-satellites.html
[22] A. Aguilar, P. Butler, J. Collins, and M. Guerster, “Tradespace exploration of the next generation communication satellites,” American Institute of Aeronautics and Astronautics (AIAA), pp. 1–30, 2019.
[23] Federal Communications Commission, DA 24-222, Washington, DC, USA, Mar. 8, 2024. [Online]. Available: https://docs.fcc.gov/public/attachments/DA-24-222A1.pdf
[24] M. Fuentes et al., “5G new radio evaluation against IMT-2020 key performance indicators,” IEEE Access, vol. 8, pp. 100880–110896, 2020.
[25] 3GPP, Physical Layer Procedures for Data (Release 17), 3GPP TS 38.214, 2022.
[26] Z. Xu, Y. Gao, G. Chen, R. Fernandez, V. Basavarajappa, and R. Tafazolli, “Enhancement of satellite-to-phone link budget by using distributed beamforming,” IEEE Vehicular Technology Magazine, vol. 18, no. 4, pp. 85–93, 2023.
[27] Z. Xu, G. Chen, R. Fernandez, Y. Gao, and R. Tafazolli, “Enhancement of direct LEO satellite-to-smartphone communications by distributed beamforming,” IEEE Transactions on Vehicular Technology, vol. 73, no. 8, pp. 11543–11555, 2024.
[28] V. Akan, “Design of polyrod antenna having isoflux radiation characteristic for satellite communication systems,” International Advanced Researches and Engineering Journal, vol. 4, no. 3, pp. 226–232, 2020.
[29] “Which is the cause of ‘scan losses’ in a linear phased antenna array?,” Electronics Stack Exchange, May 17, 2021. [Online]. Available: https://electronics.stackexchange.com/questions/565542/which-is-the-cause-of-scan-losses-in-a-linear-phased-antenna-array
[30] ITU-R, “Propagation data required for the design systems in the land mobile-satellite service,” Recommendation ITU-R P.681-11, 2019.
[31] D. Wang, C. Sun, X. Wang, L. Liu, and B. Wang, “5G integrated user downlink adaptive transmission scheme for low Earth orbit satellite Internet access network,” Mobile Networks and Applications, vol. 28, no. 4, pp. 1553–1564, 2023.
[32] S. Marin, “Interference relationships between point-to-multipoint stations at about 28 GHz authorized by area license,” 2000. [Online]. Available: https://www.ieee802.org/16/tg2_orig/contrib/802162c-00_12.pdf
 
 
 
 
Volume 5, Issue 2
March 2026
Pages 123-135

  • Receive Date 21 January 2025
  • Revise Date 13 April 2025
  • Accept Date 22 July 2025