问如何在ns2场景中创建路侧单元和eNodeB

EN

#include other tcl files
source Parameters.tcl
source Topology.tcl
source session-rtp.tcl
source http-agent.tcl
source http-cache.tcl
source http-server.tcl

#create dual-simplex links between eNodeB and the SGW
#uplink S1-U link from each eNB to SGW with user defined bandwidth and delay 
$ns simplex-link $eNodeB $SGW $input_(UP_S1_BANDWIDTH) $input_(UP_S1_DELAY) $input_(UP_S1_QUEUE)
$ns queue-limit $eNodeB $SGW $input_(QUEUE_LIMIT)

#downlink S1-U link from each SGW to eNB with user defined bandwidth and delay 
$ns simplex-link $SGW $eNodeB $input_(DOWN_S1_BANDWIDTH) $input_(DOWN_S1_DELAY) $input_(DOWN_S1_QUEUE)
$ns queue-limit $SGW $eNodeB $input_(QUEUE_LIMIT)

#create duplex link between SGW and PGW with user defined bandwidth and delay 
$ns duplex-link $SGW $PGW $input_(S5_BANDWIDTH) $input_(S5_DELAY) $input_(S5_QUEUE)
$ns queue-limit $SGW $PGW $input_(QUEUE_LIMIT)

#create duplex link between PGW and SERVER with user defined bandwidth and delay 
$ns duplex-link $PGW $SERVER $input_(SGI_BANDWIDTH) $input_(SGI_DELAY) $input_(SGI_QUEUE)
$ns queue-limit $PGW $SERVER $input_(QUEUE_LIMIT)

}