Integrated Sensing and Communications for 6G: Prospects and Challenges of Using THz Radios

The integrated sensing and communication (ISAC), which will power the future sixth generation (6G) of mobile communication, is anticipated to offer smarter and varied services. The functions of communication and sensing can be integrated because they contain some similarities, but conflicts and differences need to be resolved. The terahertz (THz) band, due to its special characteristics, can combine both communication and sensing capabilities. This article delves into the current trends, prospects, and challenges of ISAC utilizing THz radios. We outline the functions and advantages of THz radios for communication and sensing processes in the context of ISAC. Then, a generic system framework of ISAC in the THz band is given, and the integrated evolution of the communication and sensing functions of ISAC is described. Finally, an outlook on ISAC is given with the hope that THz technology will help realize a ubiquitous, smarter, and more reliable ISAC system in the near future.