[ns] IEEE 805.15.4 doesn't support DSR?

[chen guoming]

Dear All:
   I write a tcl script to test the IEEE802.15.4 protocol and I set the
routing protocol to be DSR. However,I got the error information:

[wpan/p802_15_4phy.cc::PD_DATA_request][100.105397](node 5) Invalid
PSDU/MPDU length: type = DSR, src = 5, dst = -1, uid = 3, mac_uid = 1, size
= 159

When I changed the routing protocol to AODV, it works fine.
What's the problem? Please help me.Any suggestions will be appreciated!
Regards!
David