[ns2] trasmission range_무선랜 전파 범위 설정

Network/Ns-2 | 2007/03/14 23:52 | adioshun

trasmission range


출처 : http://kr.blog.yahoo.com/myungjang


1. trasmission range를 제한하자

1.1 threshold.cc 를 컴파일
    ns-2.27/indep-utils/propagation 에서
        # g++ threshold.cc -o threshold

1.2 threshold 실행
    #./threshold -m TwoRayGround -r 0.95 1 실행결과 RXThresh_ 값으로

    1m : 0.000192278    
    5m : 7.69113e-06
    10m : 1.92278e-06
    25m : 3.07645e-07
    50m : 7.69113e-08
    75m : 3.41828e-08
    100m : 1.42681e-08
    125m : 5.8442e-09
    150m : 2.81838e-09
    175m : 1.52129e-09
    200m : 8.91754e-10
    225m : 5.56717e-10을 얻는다.
    250m : 3.65262e-10
    500m : 2.28289e-11
    1000m : 1.42681e-12

1.3 tcl 프로그램에추가
    Phy/WirelessPhy set RXThresh_ 3.07645e-07

[ns] A range question about NS2.......

Kimaya M. Sanzgiri 20040713033623.M6032@webmail5.hfu.edu.tw">kimaya at cs.ucsb.edu
Tue Jul 13 11:27:18 PDT 2004 

You cannot directly assign the transmission range in terms of
distance. To control the transmission range, you need to adjust the
values of Pt_ and RXThresh_ variables. 

Use indep-utils/propagation/threshold.cc under the ns-2 directory to see
what values of Pt_ and RXThresh_ lead to what transmission range. More
details can be obtained at http://www.isi.edu/nsnam/ns/doc/node221.html

To set a different transmission range for each node, my guess is that you
would need to hack the code so that different nodes can use different
values of Pt_/RXThresh_. I don't think such an option is directly
available in NS.

Hope that helps.
Kimaya


On Tue, 13 Jul 2004, [BIG5] ¾H¸U¼y wrote:

> 
> Hi:
> 
> I want to run a wireless model simulation. 
> However, I coun't make sour how to assign the transmitting range. 
> Could anyone tell me where I can assign it....... 
> 
> I have ever try to change the value of "RXThresh_" and "Pt", it is work, 
> but it seem like environment parameter, 
> that mean I can't given communicate range to each node particular.
> 
> the "$mobilenode radius <r>" at chapter16 in ns_doc that I try have no any 
> effect. 
> Set the range drive me crazy....
> 
> Sorry, my engligh is very poor, but I really hope someone can help me. 
> It's very important to me. Thank you very much.
> 
> 
> ikaruga
> 
> 
> --
> Open WebMail Project (http://openwebmail.org/)
> 
>

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[ns] Pt_ and txPower in energy model

Michal Lewandowski tk_michal at wp.pl
Thu Jun 10 07:26:31 PDT 2004 

Hello,

As I can see it, after reading the manual and few experiments, there is no
relation between them.

As you said, Pt_ is the antenna power, and it is used to set the distance,
for e.g.

Phy/WirelessPhy set Pt_ 7.214e-3

sets the antenna distance exactly at 100 m in FreeSpace and TwoRayGround
Propagation model. You can also set the distance when you set RXThresh_
(also can be done from tcl level), but you don't have to use it. (Pt_ and
RXTresh_ are defined in wireless-phy.cc file)



rxPower and txPower are used in Energy Model (Chapter 19 in ns_doc), witch
is a model of a battery (in for e.g. laptop). You can set the initial
battery capacity, and rxPower is the power used to receive a packet, and
txPower i one used to transmit a packet.



So, Pt_ and txPower are two different things, not related one to each other.



Best regards

Michal





----- Original Message -----
From: "Ping Ding" <dingping20004 at yahoo.com>
To: <ns-users at ISI.EDU>
Sent: Wednesday, June 09, 2004 1:34 AM
Subject: [ns] Pt_ and txPower in energy model


>
> Hi, all,
>
> In energy model, Pt_ is used to calculate Pr. And Pr is used to decide the
successful reciving the packet or not.
> txPower_ is the transmitting power. I think Pt_ and txPower are related.
Is it correct? What is the relation between Pt_ and txPower_. For example,
if Pt_ is 0.2818w then txPower_ is 0.6(transmission range is 250m). What are
the respective Pt_ and txPower when the transmission range is 40m, 60m, and
so on. Where can I find the related information?
>
> I appreciate your help.
> Ping
>
>
> ---------------------------------
> Do you Yahoo!?
> Friends.  Fun. Try the all-new Yahoo! Messenger
>

More information about the Ns-users mailing list


[ns] Pt_ and txPower in energy model

Michal Lewandowski tk_michal at wp.pl
Fri Jun 11 09:06:59 PDT 2004 

hi,
In ns you set the antenna transmit power by setting Pt_. This determines the
antenna range.

txPower and rxPower determines the energy usage for every packet antenna
transmites and receives.

Pt_ is defined in wireless-phy.cc

txPower and rxPower are defined in energy-model.cc and energy-model.h,
but they are not called txPower and rxPower but P_tx and P_rcv. They are the
transmitting and receiving power required by node's interface or PHY.

In energy-model.cc and energy-model.h there are also defined txtime and
rcvtime. txtime is time needed to transmit a packet, rcvtime - to receive a
packet. They are strictly related to packet's size.

When you multiply txPower (P_tx) and txtime you get the energy used to
transmit one packet. Analogically rxPower (P_rcv) and rcvtime.

I hope this will help you a little bit.
Best regards,
Michal


PS. I don't know why in my out.tr file field Ne is still -1.00000 even when
node energy is zero. Maybe somebody knows?



----- Original Message -----
From: "word" <word at osdp.is.tsukuba.ac.jp>
To: "Michal Lewandowski" <tk_michal at wp.pl>; <ns-users at ISI.EDU>
Sent: Friday, June 11, 2004 7:29 AM
Subject: Re: [ns] Pt_ and txPower in energy model


> hello,
> I am confusing by the same question of the transmit power.
> I have seen the energymodel.h and energymodel.cc,
> I have not found the txPower defination there.
> If I want to change the transmit power, I used to change Pt_, but as you
> said it is not right. I confused.
> eagerly expect your help.
>  sincerely
>                           word
> ----- Original Message -----
> From: "Michal Lewandowski" <tk_michal at wp.pl>
> To: "Ping Ding" <dingping20004 at yahoo.com>; <ns-users at ISI.EDU>
> Sent: Thursday, June 10, 2004 11:26 PM
> Subject: Re: [ns] Pt_ and txPower in energy model
>
>
> >
> > Hello,
> >
> > As I can see it, after reading the manual and few experiments, there is
no
> > relation between them.
> >
> > As you said, Pt_ is the antenna power, and it is used to set the
distance,
> > for e.g.
> >
> > Phy/WirelessPhy set Pt_ 7.214e-3
> >
> > sets the antenna distance exactly at 100 m in FreeSpace and TwoRayGround
> > Propagation model. You can also set the distance when you set RXThresh_
> > (also can be done from tcl level), but you don't have to use it. (Pt_
and
> > RXTresh_ are defined in wireless-phy.cc file)
> >
> >
> >
> > rxPower and txPower are used in Energy Model (Chapter 19 in ns_doc),
witch
> > is a model of a battery (in for e.g. laptop). You can set the initial
> > battery capacity, and rxPower is the power used to receive a packet, and
> > txPower i one used to transmit a packet.
> >
> >
> >
> > So, Pt_ and txPower are two different things, not related one to each
> other.
> >
> >
> >
> > Best regards
> >
> > Michal
> >
> >
> >
> >
> >
> > ----- Original Message -----
> > From: "Ping Ding" <dingping20004 at yahoo.com>
> > To: <ns-users at ISI.EDU>
> > Sent: Wednesday, June 09, 2004 1:34 AM
> > Subject: [ns] Pt_ and txPower in energy model
> >
> >
> > >
> > > Hi, all,
> > >
> > > In energy model, Pt_ is used to calculate Pr. And Pr is used to decide
> the
> > successful reciving the packet or not.
> > > txPower_ is the transmitting power. I think Pt_ and txPower are
related.
> > Is it correct? What is the relation between Pt_ and txPower_. For
example,
> > if Pt_ is 0.2818w then txPower_ is 0.6(transmission range is 250m). What
> are
> > the respective Pt_ and txPower when the transmission range is 40m, 60m,
> and
> > so on. Where can I find the related information?
> > >
> > > I appreciate your help.
> > > Ping
> > >
> > >
> > > ---------------------------------
> > > Do you Yahoo!?
> > > Friends.  Fun. Try the all-new Yahoo! Messenger
> > >
> >
> >
>
>

More information about the Ns-users mailing list



[ns] regarding AODV and range

Kenneth Nielsen kenneth at daimi.au.dk
Thu Jul 15 03:09:18 PDT 2004 

Hi Xavi,

I believe that a node's default trasmission range is 250 meters.
ou can change the transmission range with the following tcl-statement.

Phy/WirelessPhy  set Pt_ = 7.214e-4; # 100 meters

Some other transmission ranges are:
Pt_ = 8.5872e-4; # 40 meters
Pt_ = 0.2819; # 250 meters

Regards,
Kenneth Nielsen
 
----- Original Message ----- 
From: <XAVIERMM3 at telefonica.net>
To: <ns-users at ISI.EDU>
Sent: Thursday, July 15, 2004 11:16 AM
Subject: [ns] regarding AODV and range


> 
> Hi all, 
> 
> I'm trying simulate several scenarios but I have one problem. I don't 
> know how to set the maximum distance between nodes. I mean, If my grid 
> is 500 x 500 and I place the node A in (1,3) and node B in (200,200) 
> how do I know whether they're in range one another? How do I know 
> where to place the nodes in the X and Y axis in order to allow them 
> communicate?
> 
> Thanks a lot
> 
> Xavi
> 
>

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2007/03/14 23:52 2007/03/14 23:52
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