| dc.description.abstract | Data transmission over wireless networks can be achieved in various ways. Some of these technologies
are feasible in many real life scenarios, but there are many consequences we have to consider
in this field, such as packet loss, quality degradation of radio signal over distance incrementation,
ambient noise, transmission delay and etc. For the low data rate packet transmission, to adapt
and to address IoT is one of the most discussed topics nowadays, especially in terms of transmission
protocol design and the implementation of that design in real life scenarios. Transmitting
packets in low data rate over long distance efficiently is becoming an important issue in this fastpaced
modern world. Although various work has been done individually on low data rate packet
transmission and protocol to achieve longer distance. Our objective is to combine both options
in the same protocol design with diverse form of services.
In this project, we design an embedded solution and implement our own transmission schemes
based on Raspberry Pi micro-controller to send low date rate packets via radio modules that
operating on 868 MHz band to achieve long distance. We embed and implement the design
with low cost and low power components and send real-time services such as GPS co-ordinates,
temperature, image and etc. over wireless network. Then we develop our design to relay the
transmission from the source node to the destination node by using a forwarding node in between
them, which helps us to achieve further distance. These transmission schemes have the ability
to respond to each other with acknowledgements assuring the successful transactions between
the nodes and for the request of retransmissions. In addition, the schemes are developed further
to a new scheme where the retransmission will occur with an adaptive data rate at the end of
the transmission process to ensure the successful transfer of a large file. At the end, we collect
and examine the data on the sender and receiver ends and calculate parameters such as packet
loss rate, transmission delay, etc., by running the tests in di↵erent scenarios and optimising the
experimental results. The results show that with these transmission schemes the packets can be
transmitted to long distance in low data rate and with a small amount of packet loss rate. | nb_NO |
