Backscatter-based integrated sensing and communication (B-ISAC) elevates passive tags into information-bearing scatterers, offering an ultra-low-power path toward dual-function wireless systems. However, this promise is fundamentally undermined by a cascaded backscattering link that suffers from severe double fading and is exquisitely sensitive to geometric misalignment. This article tackles this geometric bottleneck by integrating movable antenna systems (MAS) at the transceiver side. MAS provides real-time, controllable spatial degrees of freedom through sub-wavelength antenna repositioning, enabling active reconfiguration of the cascaded channel without modifying passive tags or consuming additional spectrum. We position this solution within a unified ISAC-backscatter communication-B-ISAC evolution, describe the resulting MAS-assisted B-ISAC architecture and operating principles, and demonstrate its system-level gains through comparative analysis and numerical results. Finally, we showcase the potential of this geometry-adaptive paradigm across key IoT application scenarios, pointing toward future motion-aware wireless networks.

翻译：基于背向散射的集成传感与通信（B-ISAC）将无源标签提升为承载信息的散射体，为实现双功能无线系统提供了一条超低功耗路径。然而，这一前景因级联背向散射链路而受到根本性制约：该链路遭受严重的双重衰落，并对几何失准极为敏感。本文通过在收发端集成可移动天线系统（MAS）来解决这一几何瓶颈。MAS通过亚波长级天线重定位提供实时、可控的空间自由度，从而能够在无需修改无源标签或消耗额外频谱的情况下，主动重构级联信道。我们将该解决方案置于统一的ISAC-背向散射通信-B-ISAC演进框架中定位，阐述了由此产生的MAS辅助B-ISAC架构与工作原理，并通过对比分析与数值结果证明了其系统级增益。最后，我们在关键物联网应用场景中展示了这种几何自适应范式的潜力，为未来运动感知无线网络指明了方向。