Problem while trying to setup a connection between two base stations in NS-2

I am new to NS-2 and am trying to create an environment whereby a mobile node(UE) would act as a dummy base station for its nearby mobile nodes. Hence any data requeste开发者_如何转开发d from them would be routed from the UE and then to the requesting node. But i am facing problems while creating the following topology. My procedure being: 1. Create a single domain and 2 clusters in it. 2. Declare the main base station and serving node in it. 3. The second cluster being defined with the serving node as a base station. 4. This serving node is connected to many other nodes in the second cluster.