6G wireless System
▶ Introduction

The remarkable upsurge of Internet of everything (IoE)-based smart applications has paved the way for the evolution of existing wireless networks. The term IoE refers to bringing together things, data, people, and process, via emerging technologies to offer a wide variety of smart services [1]. The emerging IoE services include autonomous connected vehicles, brain-computer interfaces, extended reality (XR), flying vehicles, and haptics [2]-[4]. These services are mostly based on ultra-high reliability, high data rates, unmanned mobility management, and long-distance communication. Fifth-generation (5G) wireless networks are envisioned to enable a wide variety of smart IoE-based services. The 5G targeted tactile network is accessed via different approaches, such as simultaneous use of unlicensed and licensed bands, intelligent spectrum management, and 5G new radio, to enable different smart applications [5]-[8]. However, 5G has several inherent limitations and difficulties to completely fulfill its target goals until now. The development of different data-centric, automated processes are proving to exceed the capabilities defined by key performance indicators of 5G [9]. For instance, several applications, such as haptics, telemedicine, and connected autonomous vehicles, are intended to use long packets with ultra-high reliability and high data rates. Such applications violate the notion of generally using short packets for ultra-reliable low-latency communication (URLLC) in 5G [2]. The next generation of virtual and augmented reality-based applications, such as holographic teleportation will require microsecond-level latency and Tbps-level data rates [10]. Such a type of requirements seem difficult to be fulfilled by 5G networks. Furthermore, the 5G connectivity density of 106/km2 [11] might not be able to meet the growing demands of next-generation smart industries. Therefore, sixth-generation (6G) wireless systems must be developed. Fig. 1 presents an overview of 6G wireless system and illustrates its key requirements in terms of capacity, uplink data rate, downlink data rate, localization precision, reliability in terms of frame error rate, latency, jitter, and energy per bit [12].

Fig. 1: Overview of 6G wireless systems [13]

▶ Research Issues

  • Artificial Intelligence-based adaptive transceivers
  • Intelligent cell-les architecture
  • Intelligent wireless energy harvesting
  • Decentralized and secure business models
  • Distributed security models
  • Reconfigurable smart reflecting surfaces-enabled 6G

  • ▶ References

    1. The internet of everything (ioe). [Online, Accessed June 17, 2020]. [Online]. Available: https://www.bbvaopenmind.com/en/ technology/digital-world/the-internet-of-everything-ioe/
    2. W. Saad, M. Bennis, and M. Chen, “A vision of 6G wireless systems: Applications, trends, technologies, and open research problems,” IEEE Network, vol. 34, no. 3, May/June 2020.
    3. K. David and H. Berndt, “6G vision and requirements: Is there any need for beyond 5g-” IEEE Vehicular Technology Magazine, vol. 13, no. 3, pp. 72-80, September 2018.
    4. K. B. Letaief, W. Chen, Y. Shi, J. Zhang, and Y.-J. A. Zhang, “The roadmap to 6G: Ai empowered wireless networks,” IEEE Communications Magazine, vol. 57, no. 8, pp. 84-90, August 2019.
    5. F. Hu, B. Chen, and K. Zhu, “Full spectrum sharing in cognitive radio networks toward 5G: A survey,” IEEE Access, vol. 6, pp. 15 754-15 776, February 2018.
    6. M. Agiwal, A. Roy, and N. Saxena, “Next generation 5G wireless networks: A comprehensive survey,” IEEE Communications Surveys & Tutorials, vol. 18, no. 3, pp. 1617-1655, February 2016.
    7. S. Li, L. Da Xu, and S. Zhao, “5G internet of things: A survey,” Journal of Industrial Information Integration, vol. 10, pp. 1-9, June 2018.
    8. S. A. A. Shah, E. Ahmed, M. Imran, and S. Zeadally, “5G for vehicular communications,” IEEE Communications Magazine, vol. 56, no. 1, pp. 111-117, January 2018.
    9. M. Giordani, M. Polese, M. Mezzavilla, S. Rangan, and M. Zorzi, “Toward 6G networks: Use cases and technologies,” IEEE Communications Magazine, vol. 58, no. 3, pp. 55-61, March 2020.
    10. I. Akyildiz, A. Kak, and S. Nie, “6G and beyond: The future of wireless communications systems,” To appear, IEEE Access, 2020.
    11. H. You, “Key parameters for 5G mobile communications [itu-r wp 5d standardization status]. kt,” 2015
    12. E. C. Strinati, S. Barbarossa, J. L. Gonzalez-Jimenez, D. Ktenas, N. Cassiau, L. Maret, and C. Dehos, “6G: The next frontier: From holographic messaging to artificial intelligence using subterahertz and visible light communication,” IEEE Vehicular Technology Magazine, vol. 14, no. 3, pp. 42-50, August 2019
    13. Latif U. Khan, Ibrar Yaqoob, Muhammad Imran, Zhu Han, Choong Seon Hong, "6G Wireless Systems: A Vision, Architectural Elements, and Future Directions," IEEE Access, DOI:10.1109/ACCESS.2020.3015289.

    ▶ Achievements

    1. 1. Latif U. Khan, Ibrar Yaqoob, Muhammad Imran, Zhu Han, Choong Seon Hong, "6G Wireless Systems: A Vision, Architectural Elements, and Future Directions," IEEE Access, DOI:10.1109/ACCESS.2020.3015289.