NS3-WSN for 802.15.4

[mukek...@gmail.com]

Hello all :

I am a beginner with NS-3 and I want to do the simulate the real static WSN with some sensor nodes(maybe 20~100 nodes) and one sink node,and now I haved used the lr-wpan module (802.15.4), created nodes and attached the lrwpanNetDevices to them,but i don't know how to make a sensor node to transmite the message to the sink node (multi-hop) ,any existing modules can be used to make the network work ?