Multipath Opportunistic RPL Routing Over IEEE 802.15.4
The authors consider the problem of running RPL on top of the IEEE 802.15.4 MAC layer - the two layers operate over two different structures, a directed acyclic graph in the case of RPL and a cluster-tree for IEEE 802.15.4. The authors propose to adapt the cluster-tree of IEEE 802.15.4 so that it can efficiently work coupled with RPL. Nodes in their modified cluster-tree can associate with several parent nodes by taking advantage of an adequate organization of superframes at the MAC layer. Building on this modified MAC layer, they define an opportunistic forwarding scheme that extends RPL with the possibility of forwarding packets over multiple paths.