arXiv:2610.21617v1 Announce Type: new Abstract: The synchronization signal block (SSB) is designed to synchronize a capable user-equipment (UE) with the base-station (BS) in recent cellular networks. However, the same SSB cannot be utilized by a narrowband, low-complexity, and low-power internet of things (IoT) device for synchronization. To address this limitation, this paper proposes a dual-purpose SSB (DP-SSB) to enable low-complexity IoT synchronization using the existing SSB, while ensuring uninterrupted conventional UE operation. Specifically, selected demodulation reference signal (DMRS) symbols are contiguously mapped to some physical resource blocks (PRBs) in the second and fourth symbols of the DP-SSB. These DMRS symbols are further optimized using a receiver-aware least square (LS) approach to impose a distinct time-domain structure at the output of the IoT front-end. At the IoT receiver, a reduced-rate observation of the DP-SSB is obtained after narrowband filtering and decimation that is exploited for energy detection and sequential time-frequency (TF) synchronization. For the UE, primary synchronization signal (PSS) and secondary synchronization signal (SSS)-based synchronization is preserved, while the effect of relocated DMRS on the channel estimation and physical broadcast channel (PBCH) reception is assessed. The performance of the proposed DP-SSB is evaluated in terms of detection probability, TF synchronization accuracy, IoT receiver computational complexity, and UE-side PBCH decoding. Simulation results validate the analytical detection characterization and demonstrate reliable low-power IoT synchronization performance compared with the benchmark synchronization schemes while maintaining conventional UE operation.