[ns] zigbee routing

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hi all NSers, I am doing the research work on Zigbee Routing,there is IEEE802.15.4 modules, but there is no zigbee routing modules in ns2 now, is there anybody doing the similar work now or before?In Zigbee Spec. there r many interfaces between NWK Layer and MAC layer(APS), if I want to make my own zigbee routing modules in ns, must I make the whole NWK and APS stack in Zigbee Spec. I just want to implement zigbee routing in ns and make a comparison with other routing protocol . Could anybody give me some advice, I am a beginner in NS. Prof. told me implement the zigbee routing scheme in ns firstly, and then give out my own optimal scheme in Home and Building Automation system with zigbee as groundwork appreciate ur reply  HYUSN Delai.
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