RPL'NİN GÜVENİLİR VE DÜŞÜK GÜCE SAHİP HAREKETLİLİK DESTEĞİ İÇİN YENİDEN TASARLANMASI
Özet
With the development of wireless sensor networking technologies, its application areas have also increased rapidly. However, this increase has not been able to use its true potential since the used protocols have not been standardized. To address this problem, the 6LoWPAN (IPv6 over Lowpower Wireless Personal Area Network) adaptation layer developed by the IETF (Internet Engineering Task Force) has enabled wireless sensor networks to work in the IPv6 infrastructure. The same workgroup has developed the RPL (IPv6 Routing Protocol for Low Power and Lossy Networks), an IPv6 compatible routing protocol. The study carried out within the scope of the thesis deals with the mobility which is one of the fundamental shortcomings of the RPL protocol.
Mobility is a basic but comprehensive problem in wireless sensor networks. In applications that require high packet transmission rates, such as home and industrial automation or patient tracking, mobility reduces packet transmission and makes it difficult to meet application requirements.
In order to avoid this problem, the RPL protocol has been given mobility ability within the scope of the thesis. To manage the mobility, a fast hand off algorithm under the name of Phoenix has been designed. The goal of the design has been to reduce the energy consumption while increasing the packet transmission rate by making a rapid transition between parent nodes independently from the application layer.
The designed algorithm is implemented on Contiki, one of the wireless sensor network operating systems. In order to examine the performance of the algorithm, comparative simulations and field tests were performed in various scenarios. The comparisons were made by using the standard Contiki RPL protocol and the RPL protocol which uses increased number of control messages. Simulation and field tests have shown that the Phoenix algorithm improves the packet transmission rate and energy conservation by reducing the hand off delay.
