The security vulnerabilities are becoming the major obstacle to prevent the wide adoption of ultra-reliable and low latency communications (URLLC) in 5G and beyond communications. Current security countermeasures based on cryptographic algorithms have a stringent requirement on the centralized key management as well as computational capabilities of end devices while it may not be feasible for URLLC in 5G and beyond communications. In contrast to cryptographic approaches, friendly jamming (FJ) as a promising physical layer security method can enhance wireless communications security while it has less resource requirement on end devices and it can be applied to the full distribution environment. In order to protect wireless communications, FJ signals are introduced to degrade the decoding ability of eavesdroppers who maliciously wiretap confidential information. This article presents a state-of-the-art survey on FJ schemes to enhance network security for IoT networks with consideration of various emerging wireless technologies and different types of networks. First, we present various secrecy performance metrics and introduce the FJ method. The interference caused by FJ signals on legitimate communication is the major challenge of using FJ schemes. In order to overcome this challenge, we next introduce the integration of FJ schemes with various communication technologies, including beamforming, multiple-input multiple-output, full duplex, and relay selection. In addition, we also integrate FJ schemes with different types of communication networks. Finally, a case study of FJ schemes is illustrated and future research directions of FJ schemes have been outlined.

安全漏洞正成为阻止超可靠和低延迟通信（URLLC）在5G及更高版本通信中广泛采用的主要障碍。当前基于密码算法的安全对策对集中式密钥管理以及终端设备的计算能力有严格的要求，而对于5G和更高通信领域中的URLLC来说可能并不可行。与加密方法相反，友好干扰（FJ）作为一种有前途的物理层安全方法，可以提高无线通信的安全性，同时对终端设备的资源需求更少，并且可以应用于完整的分发环境。为了保护无线通讯，引入FJ信号会降低窃听窃听机密信息的窃听者的解码能力。本文介绍了有关FJ方案的最新技术调查，以提高IoT网络的网络安全性，同时考虑了各种新兴的无线技术和不同类型的网络。首先，我们介绍各种保密性能指标并介绍FJ方法。FJ信号对合法通信造成的干扰是使用FJ方案的主要挑战。为了克服这一挑战，我们接下来介绍FJ方案与各种通信技术的集成，包括波束成形，多输入多输出，全双工和中继选择。此外，我们还将FJ方案与不同类型的通信网络集成在一起。最后，