It is anticipated that integrated sensing and communications (ISAC) would be one of the key enablers of next-generation wireless networks (such as beyond 5G (B5G) and 6G) for supporting a variety of emerging applications. In this paper, we provide a comprehensive review of the recent advances in ISAC systems, with a particular focus on their foundations, system design, networking aspects and ISAC applications. Furthermore, we discuss the corresponding open questions of the above that emerged in each issue. Hence, we commence with the information theory of sensing and communications (S$\&$C), followed by the information-theoretic limits of ISAC systems by shedding light on the fundamental performance metrics. Next, we discuss their clock synchronization and phase offset problems, the associated Pareto-optimal signaling strategies, as well as the associated super-resolution ISAC system design. Moreover, we envision that ISAC ushers in a paradigm shift for the future cellular networks relying on network sensing, transforming the classic cellular architecture, cross-layer resource management methods, and transmission protocols. In ISAC applications, we further highlight the security and privacy issues of wireless sensing. Finally, we close by studying the recent advances in a representative ISAC use case, namely the multi-object multi-task (MOMT) recognition problem using wireless signals.

翻译：可以预见，集成感知与通信（ISAC）将成为支持多种新兴应用的下一代无线网络（如超5G（B5G）和6G）的关键推动技术之一。本文对ISAC系统的最新进展进行了全面综述，特别聚焦于其理论基础、系统设计、组网架构及典型应用。此外，针对上述各方向中涌现的开放性问题展开讨论。我们首先从感知与通信（S&C）的信息论出发，阐明ISAC系统的信息论极限及其基础性能度量指标；继而探讨其时钟同步与相位偏移问题、相应的帕累托最优信号策略，以及超分辨率ISAC系统设计。更进一步，我们预见ISAC将引领未来依赖网络感知的蜂窝网络范式转变，重塑经典蜂窝架构、跨层资源管理方法与传输协议。在ISAC应用层面，着重强调无线感知中的安全与隐私挑战。最后，通过剖析代表性ISAC用例——基于无线信号的多目标多任务（MOMT）识别问题的最新研究，为本文画上句号。