Table 5.

Future research direction comparative analysis with existing literature.

Description of future research direction	Abir et al. (2020)	Ahmed et al. (2018)	Marques et al. (2019)	Somasundaram and Thirugnanam (2020)	Baker et al. (2017)	our survey paper
Edge architecture in H-IoT	No	No	No	No	No	Yes
Cryptography with edge and fog computing	Yes	No	No	No	No	Yes
Sensors & actuator Integration in H-IoT	No	No	No	No	No	Yes
Dew Computing in H-IoT	No	No	No	No	No	Yes
Blockchain based H-IoT	Yes	Yes	Yes	Yes	Yes	Yes
Machine Learning in H-IoT	No	No	Yes	No	Yes	Yes
Digital Twin in H-IoT	No	No	No	No	No	Yes
Unified network Integration framework	No	No	Yes	No	No	Yes
Context aware accessibility	No	Yes	Yes	No	No	Yes