An opportunistic routing strategy was proposed based on the analyses of the channel quality, the movement speed and energy cost of a node synthetically. The received signal strength indicator was used to build opportunity probability. And then, the movement speed was used to reflect the node mobility. At last, the energy cost was used to express node residual life. The opportunistic routing was built by them and the preferred number of a candidate node was defined in order to determine its listening forwarding time. Furthermore the problem of package retransmission was solved. The analysis and simulation show that, compared with Extremely Opportunistic Routing (ExOR) and Opportunistic with Backtracking (OB), the new strategy is more suitable for opportunistic network with higher validity and lower energy cost.

It is very difficult to get the security in sensor networks because of the limited resources of nodes and the wireless communication between nodes. A double security-based routing algorithms was proposed based on the existed security arrangement and low power consumption multipath.The existed security arrangement can provide security to some certain case and multipath can provide more security even when security arrangement failed. Theoretic analysis and simulation results show that the new algorithm has better performances.