Cost-aware and Reliable Mesh-under Routing for Delivering IPv6 Packets over Low Power Wireless Personal Area Network

The 6LoWPAN protocol is used in delivering IPv6 packet over IEEE 802.15.4 based low power Wireless personal area network (WPAN). The Mesh-under routing (MUR) presented in the 6LoWPAN conducts routing in the adaptation layer. When delivering an IPv6 packet over a route consisting of multiple unreliable links, the probability that the IPv6 packet reaches the destination via MUR is very low. This drawback is remedied by the proposed Cost-aware and reliable MUR (CAR-MUR) scheme, which extends the MUR to incorporate a packet redelivery mechanism in the transport layer and is able to find the best number of trials in the transport layer, the best number of the retrials in the MAC layer, and the best number of fragments in each packet so that the total cost for packet delivery is minimized while guaranteeing all the packets to reach the destination with a preset probability. The numerical analysis shows that, compared to the MUR, the proposed CAR-MUR has better performance as it minimizes the packet delivery cost while guaranteeing that all the packets are delivered to the destination with an intended probability.