[ns] Problem with handoff between 802.11 and UMTS

[robbin]

Dear all:

I patched ns-eurane-111.diff.gz(UMTS) for clean ns-2.28.
Then I want to see how a mobile node handoff from 802.11 to UMTS (on sctp).
But I am not familiar with UMTS system .So I have no idea to integrate 
802.11 and UMTS.My topology is as following:

O_________O___________O))))))))))
CN   ROUTER(GATEWAY)  UMTS(BS)
          |                             ^
          |                             |
          |                             | 
          |___________O))))))))))       MN
                      802.11(AP)
Does anyone have simple tcl script?
Please help me.
Thank you in advance.

Robbin
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