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在网络仿真模拟工具下实现支持QoS的MAC层EDCF协议

Installation of MAC 802.11e EDCF-Code:
**************************************

1. please change into the directory ns-whatever/ns-x.y/mac/

2. copy the file 80211e_EDCF_CFB.tgz into this directory and extract it with:
     tar -xvzf 80211e_EDCF_CFB.tgz 	

3. changes to your Makefile.in in ns-whatever/ns-x.y/:
   - add to INCLUDES: 
               -I./mac/802_11e
   - add to OBJ_CC:   
               mac/802_11e/mac-802_11e.o mac/802_11e/priq.o 
               mac/802_11e/d-tail.o mac/802_11e/mac-timers_802_11e.o	 
   - exclude in NS_TCL_LIB:
               tcl/lib/ns-mobilenode.tcl \	       
   - add to NS_TCL_LIB:
               mac/802_11e/ns-mobilenode_802_11e.tcl \
	       mac/802_11e/priority.tcl \

4. changes to your ns-whatever/ns-x.y/tcl/lib/ns-lib.tcl:
   - exclude from the source list:
	       source ns-mobilenode.tcl
   - add to the source list: 
               source ../../mac/802_11e/ns-mobilenode_802_11e.tcl
               source ../../mac/802_11e/priority.tcl

5. changes to your ns-whatever/ns-x.y/tcl/lib/ns-default.tcl:
   - add:
               Queue/DTail set drop_front_ false
               Queue/DTail set summarystats_ false
               Queue/DTail set queue_in_bytes_ false
               Queue/DTail set mean_pktsize_ 500
	       Queue/DTail/PriQ set Prefer_Routing_Protocols    1
               Queue/DTail/PriQ set Max_Levels   4 
               Queue/DTail/PriQ set Levels    4

6.  add to tcl/lan/ns-mac.tcl:
               if [TclObject is-class Mac/802_11e] {
                 ...
	         copy settings of MAC/802.11 
		 (which are contained in this file) into this section
                 ...
	         Mac/802_11e set cfb_ 0 ;# disables CFB
	       }

7. run ./configure; make clean; make depend; make in your ns directory

8. happy simulating :o) (e.g with the example script ../ns-x/mac/802.11e/multi_udpflows.tcl) 


Simulations with 802.11e EDCF
*****************************

- in your simulation script: After defining your transport_agent
  % set transport_agent [new Agent/UDP]
  ,just add 
  % $your_transport_agent prio_ x 
  to give a certain flow a specific priority
  (x between 0 and 3, 0 being the highest, 3 being the lowest priority).

- changes to 802.11e parameters (CW_MIN, CW_MAX, AIFS, TXOPLimit, PF) should be
  made in ../ns-x/mac/802_11e/priority.tcl for each queue. Please rerun make afterwards.

- please set Mac/802_11e cfb_ to 1 (in tcl/lan/ns-mac.tcl) if you want to enable CFB in 
  your simulations. Rerun make afterwards.