[Ns-developers] problem with channel switching

[Venkat Ch]

Hello All,

  I am modifying ns-2 code to support dynamic channel switching in 802.11.
I am doing the following.
I am trying to switch the channel at fixed at intervals ...

For eg

time 0(Working on channel 1)-------------------1(Switch to channel
2)----1.5(Switch back to channel 1)----------------2 (Switch to
channel2) ----2.5---

And so son ...

So to do that what i did was as follows.

I created a new channel object and called the following function
setNewChnl in mac/mac-802_11.cc

void Mac802_11::setNewChnl(WirelessChannel* chan)
{
        Phy *down = (Phy * ) downtarget_;
        cur_chan = (WirelessChannel *) down->channel();
        down->setchnl(chan);
}

In the above function the index of the cur_chan is 0 and the index of chan is 1.
But when I try to print the index value of the channel in sendDown
function I could see the a value of 0 only ( I should get 1).

The statement added by me in sendDown( in mac/wireless-phy.cc) function is ...
printf("\n index of the channel is %d: sendDown: wireless-phy.cc
",channel_->index());


Can you please tell me why the channel is not getting changed, even
though I explicity created a new channel object and assigned it to
channel_ (present in the class Phy)?


Thanks & Regards
Venkat

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