[ns] An extension of AODV in ns-2.31

[Kiraneet sharma]

Respected brothers/sisters,
I am a begineer in ns-2.
Currently I am working over a mini project where I am implemeting the paper
"A Semi-Proactive AODV Routing Protocol for Wireless Networks",
(2008 International Conference on Advanced Computer Theory and Engineering)
I had to make quite a few changes in AODV protocol,but I have got stuck over
some
1. I have added a counter field, min_thr(threshold) and max_thr in
   class aodv_rt_entry {
        friend class aodv_rtable;
        friend class AODV;
        ...
        ...
       double          rt_expire;       // when entry expires
        u_int8_t        rt_flags;
        int             counter;
        int             minthr;
        int   maxthr;
       ...
      ...
       }

   Now these have to be initialized as
  min_threshold=no of neighbors
  max_threshold=2*min_threshold.
  Q: How do I use the AODV_Neighbor class/nb_list to initialize these values
?
2. Whenever a node receives a RERR message for each unreachable destination
included in the
   packet, the node determines whether the source node forwarding the RERR
packet is the next hop used to
   reach that destination. It then checks the Counter value for this entry
is above
   Min_Threshold, if so, the node will initiate a RREQ with the
   value one.
  So it updates it's table only, and forward it to find a new route
  to that destination.other
  intermediate nodes receive this RREQ, they will not
  increment the Counter value for this entry in their and just reply
  back with an available route to this destination
   For this I have made changes in aodv.cc
  void AODV::rt_resolve(Packet *p) {
 struct hdr_cmn *ch = HDR_CMN(p);
 struct hdr_ip *ih = HDR_IP(p);
 aodv_rt_entry *rt;
 ...
 ...
  /*
  * I am trying to forward a packet for someone else to which
  * I don't have a route.
  */
 else {
  Packet *rerr = Packet::alloc();
  struct hdr_aodv_error *re = HDR_AODV_ERROR(rerr);

 /*
  * For now, drop the packet and send error upstream.
  * Now the route errors are broadcast to upstream
  * neighbors - Mahesh 09/11/99
  */
   if(rt->counter>rt->minthr)
  {
       sendRequest(rt->rt_dst,1);
  }
   else
   {

    assert (rt->rt_flags == RTF_DOWN);
    re->DestCount = 0;
  ...
  ...
 }
      }

  Is this the correct function to be changed  for this purpose?
  I have changed the prototype and definition od sendRequest function too.
3. The Counter field of the route entry is checked before deletion(i.e.
after it has
   crossed it's LIFETIME period).
   If the Counter<MinTH, the node will delete the route entry, otherwise,
   the node will decrement the Counter value by one and update the Lifetime
for the route table entry to the
   current time plus ACTIVE_ROUTE_TIMEOUT
   For this where do I have to make the changes

   Is it   void AODV::rt_purge() in aodv.cc
   If yes where exactly?

Thanks a ton for devotion precious moments of your life
over my problem.

Expcting your co=operation and timely reply.
Loads of wishes
Kiraneet.