## 2 Methodology  
This review paper adopts the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) methodology to systematically collect, analyze, and synthesize the existing literature on AI-enabled 6G Internet of Things (IoT). The PRISMA methodology is widely recognized for its systematic approach to conducting comprehensive literature reviews, particularly in fields with broad topics and structured research questions, similar to the scope of this review. The process begins with identifying relevant studies from academic databases like SCOPUS and other reputable sources, utilizing keywords such as \"AI\", \"6G\", \"Internet of Things\", and \"AI in IoT\" to gather pertinent literature. The search results include 38 papers and 5 book chapters on AI, 40 papers and 3 book chapters on 6G, 18 papers \begin{table}
\begin{tabular}{p{113.8 pt} p{113.8 pt}} \hline
**Technology** & **Features** \\ \hline First-Generation Technology (1G) & Analog, voice-only, limited coverage, large phones, low capacity \\ \hline Second-Generation Technology (2G) & Digital, text messaging (SMS), improved voice quality, better security, limited data services \\ \hline Third-Generation Technology (3G) & Higher data rates, mobile internet, video calling, better coverage, multimedia messaging (MMS), location-based services \\ \hline Fourth-Generation Technology (4G) & Mobile broadband, high data rates (up to 1 Gbps), seamless handovers, HD streaming, VoIP, improved spectral efficiency, reduced latency \\ \hline Fifth-Generation Technology (5G) & Ultra-fast data (up to 10 Gbps), massive device connectivity (IoT), network slicing, low latency (1 ms), enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLCs), massive machine-type communications (mMTCs) \\ \hline Sixth-Generation Technology (6G) & Terabit data rates, satellite integration, advanced AI for network management, ubiquitous connectivity, tactile internet, enhanced security, energy efficiency, holographic communication, integrated sensing and communication (ISAC) \\ \hline \end{tabular}
\end{table} 
Table 1: 1G to 6G network and their features. Figure 1: A road map from 1G to 6G network [4]. and 4 book chapters on the Internet of Things, and 14 papers and 5 book chapters on AI in IoT. Next, records are screened to remove duplicates and assess titles and abstracts, resulting in 100 papers and 15 book chapters after duplicates are removed, and 85 papers and 13 book chapters are screened. Full-text articles are then evaluated for eligibility, with 40 papers and 10 book chapters assessed, and 8 papers and 2 book chapters excluded, with the reasons documented. Finally, the studies that meet the eligibility criteria are included in the qualitative synthesis, resulting in 32 papers and 8 book chapters. Figure 2 illustrates the selection process, and is included to provide a visual representation of the methodology. This includes the number of studies identified, screened, excluded, and included at each stage of the review process. In this phase, retrieved studies are screened based on predefined inclusion and exclusion criteria. Inclusion criteria prioritize studies that specifically address AI applications in the context of 6G IoT technologies, covering opportunities, key technologies, challenges, and future directions. Exclusion criteria filter out studies that are not directly related to the primary focus or lack relevance to the thematic scope. Selected studies undergo a thorough eligibility assessment to ensure they meet the defined criteria and contribute substantively to the review objectives. Relevant data from eligible studies are extracted and organized to facilitate detailed analysis and synthesis. The included studies are critically appraised to assess their methodological quality and relevance to the review's objectives.