This paper presents the design procedure of the NS-3 script for WLAN that is organized according to the hierarchical manner of TCP/IP model. We configure all layers by using NS-3 model objects and set and modify the values used by objects to investigate the effects of MAC parameters (access mechanism, CWmin, CWmax and retry limit) on the performance metrics viz. packet delivery ratio, packet lost ratio, aggregated throughput, and average delay. The simulation results show that RTS/CTS access mechanism outperforms basic access mechanism in saturated state, whereas the MAC parameters have no significant impact on network performance in non-saturated state. A higher value of CWmin improves the aggregated throughput in expense of average delay. The tradeoff relationships among the performance metrics are also observed in results for the optimal values of MAC parameters. Our design procedure represents a good guideline for new NS-3 users to design and modify script and results greatly benefit the network design and management.

The concept of smart classroom has been around for quite a long time and a lot of work still in progress to facilitate teaching-learning environment in more productive and intuitive way. This SMARTness did not limit itself into a single classroom, rather it extended itself to make the whole institute campus smart by automating facilities and access to individual entity. This move gained much pace by the introduction of the concept of Internet of Things (IoT). IoT is not a new concept, but it actually formalized a process where an Object itself has ability to sense its environment, act (optionally) according to sensed data, and finally and more importantly, communicate this data to a remote entity over a network. This way an Object becomes a smart entity which can literally be applied to any field or context that is only limited by the imagination. Smart campus, smart city, smart classroom, and much more Machine-to-Machine (M2M) applications are examples of IoT. In this paper, IoT enabled smart campus environment was explored based on existing literatures and different applications. Then current state of a university campus in Bangladesh, Hajee Mohammad Danesh Science and Technology University (HSTU), was explored and finally, possibility and opportunity of applying IoT enabled smart classroom, laboratory, library, and buildings for the context of HSTU was investigated and necessary recommendations were suggested in order to avail the smartness in HSTU university campus.

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