  Extreme crowding of electromagnetic spectrum in recent years has led to the
challenges in designing sensing and communications systems. Both systems
require a broad range of bandwidth, thus resulting in competing interests in
exploiting the spectrum. Efficient spectrum and hardware utilization have led
to the emergence of integrated sensing and communications (ISAC) systems, which
have recently emerged as a candidate 6G technology. In particular, we provide
potential techniques, namely the opportunistic ISAC and optimized ISAC.
Rate-splitting multiple access (RSMA) is highlighted as an optimized ISAC
technique for LEO-ISAC systems due to its effectiveness in simultaneously
managing interference and enabling better communication-sensing trade-off
performance.
