# Efficient Secure Routing Mechanisms for the Low-Powered IoT Network: A Literature Review
## 10 Existing Literature  
Many researchers have proposed their novel work in the domain of WSN-IoT. Table 5 shows the contributions of the recent work conducted by several researchers. The table states the contribution of their work and the limitations in terms of the research gaps of the specific research. The table identifies the research gaps, which helps spot the regions where further research and development must be conducted. The most significant research gaps are in the context of security, implementation, real-time processing, and evaluation. These gaps can provide future areas of work in this domain.  
\begin{table}
\begin{tabular}{c c c c} \hline \hline \multicolumn{1}{c}{**Sr.no**} & \multicolumn{1}{c}{**Author Name and Year**} & \multicolumn{1}{c}{**Contribution**} & \multicolumn{1}{c}{**Research Gaps**} \\ \hline \multirow{3}{*}{1} & [PERSON] et al., 2020 [103] & The technique has a low computing load and is very attractive for producing coverage maps that can be used for the optimum distribution of network resources. & The evaluation of output connectivity protocol requirements for satellite-based WSN-IoT simulations in virtual environments is lacking. \\ \hline \multirow{3}{*}{2} & [PERSON] et al., 2019 [91] & The algorithm considers residual energy, initial energy, and the cluster heads’ desired value to select the following cluster heads for the network that fit WSN-IoT applications to maximize throughput, lifetime, and residual energy. & Does not consider further CH selection parameters in a mobile node network that continually changes its role. \\ \hline \multirow{3}{*}{3} & [PERSON] et al., 2019 [92] & Capable of collecting real-time data from an IoT-aided production device and creating a Design Thinking (DT) model that essentially represents the actual system’s real situation. & Other essential features of DT are the lack of experimentation and optimization to forecast future positions or results. \\ \hline \multirow{3}{*}{4} & [PERSON] et al., 2020 [93] & The system is suitable for measurements of vibrations or earthquake events. The simulation results show that the EECDS-SGETRot mode offers the best products for a better version of the monitoring network and nodes that sinks can reach. \\ \hline \multirow{3}{*}{5} & [PERSON] et al., 2020 [94] & The design reduces the amount of energy used by wireless sensors. The method is also helpful for determining the architectural location of sensors in WSNs, the total number of sensors required, and reliability. & The design contains some drawbacks and does not function on data in real-time. \\ \hline \multirow{3}{*}{6} & [PERSON] \& [PERSON], 2020 [95] & Framework architecture for implementation patterns of relay nodes and load balancing between them to increase the network lifespan. This strengthens the deployment pattern of relay nodes for the sensor network. & The different network measurement criteria, such as network lifetime, overhead transmission costs, average electricity usage, and adequate overall area coverage, are still unknown. \\ \hline \multirow{3}{*}{7} & \multirow{3}{*}{[PERSON] et al., 2020 [90]} & A new security mechanism, “Metric-based Routing Protocol for Low-power and Lossy Networks (RPL) Trustworthiness Scheme (MRTS),” is introduced to address the RPL vulnerabilities. Furthermore, the simulations indicate that MRTS is far more effective regarding energy consumption, packet delivery ratio, changes in node rank, and throughput. \\ \hline \hline \end{tabular}
\end{table}
Table 5: Current work conducted in the domain of WSN-IoT and the research gaps.