Link Quality Based Hierarchical Routing Algorithm for 6LoWPANINTRODUCTIONWireless Sensor Network (WSN) is one of the fastest growing areas in the networking world today. To convert the WSN from Personal Area Network (PAN) to Low Power Personal Area Network (LoWPAN), the IEEE 802.15.4 standard was introduced. However, future WSNs would consist of thousands of nodes, and these networks could be connected to others via the Internet. Therefore, IPv6 over LoWPAN (6LoWPAN) is defined by the Internet Engineering Task Force (IETF) as a technique for integrating Internet functionality into the WSN. 6LoWPAN provides a WSN node with IP communication capability by placing an adaptation layer on top of the IEEE 802.15.4 link layer for packet fragmentation and reassembly purpose. The 6LoWPAN concept was born from the idea that "the Internet Protocol could and should be applied to even the smallest devices" and that low-power devices with limited processing capabilities should be able to participate in the Internet of Things. The arrival of 6LoWPAN enables the development of IP-based applications for low-power wireless networks such as sensor networks. There are often unreliable radio channels or frequent node failures in sensor networks, and the question arises of how 6LoWPAN-based applications can be hardened against such problems. 6LoWPAN consists of a huge address pool sufficient for future Internet-compatible devices. The Internet Engineering Task Force (IETF) has standardized the transmission of IPv6 over LoWPAN via 6LoWPAN, and an adaptation layer with various mechanisms such as header compression, packet fragmentation, and reassembly has been introduced above the logical link layer of the data stack. IEEE 802.15.4 protocols. The reference model of the 6LoWPAN protocol s...... half of the document ......le that the proposed algorithm takes much less time and therefore becomes more efficient. blue line depicting series 1 for the basic HiLOW protocol and red line for series 2 for the proposed link quality-based HiLOW protocol. The above result clearly shows very low routing overhead in the case of the proposed algorithm and demonstrates that the proposed algorithm would provide a better routing structure. shown by the blue line series versus the red line series depicting the baseline HiLOW. The low packet loss rate demonstrates that when routing is performed with the best link quality, more packets reach the destination and routing efficiency is significantly improved.