Re: [ns] MAC layer implementation
Dear Gomathi, Your question is not clear. What neighbor you are looking for? If you are looking for routing neighbours you can only do in routing layer. If you are looking for Radio Range or Carrier Sense neightbour you can do either using a) routing.cc - this approach has been recently elaborated, kindly check the NS2 messages archive ,or b) channel.cc - WirelessChannel::getAffectedNodes() would be of your interest. Do take note, if you use this approach, you would need to modify the square radio range to a circular radio range to better exhibit the transmission property of radio of a wireless node. Dont think you could do MAC layer in the present form, as the neighbour management is only done in routing layer. Good Luck. rgds Saravanan K On Mon, May 27, 2013 at 4:13 AM, Gomathi Rajamanickam gomathi250...@gmail.com wrote: Hi, I am doing my project in MAC layer. I want to form a neighbor table for each node in MAC layer. Please any one help me how to form neighbor list in MAC layer? Regards, R. Gomathi
Re: [ns] Collision measurement
Pedro, The tracefile will be useful for you. Good Luck. rgds Saravanan K On Fri, May 24, 2013 at 6:15 AM, pedro chaparro pdr...@gmail.com wrote: Hi All, there is some way to measure the number of collisions in a wireless 802.11 scenario? -- Pedro Alonso Chaparro Valero RD Engineer Ciudad Politecnica de la Innovación iTEAM - Mobile Communications Group Polytechnic University of Valencia C\ Camino de Vera S/N, Edificio 8G 46022 Valencia, Spain
Re: [ns] Queue Delay
Hi, Tried to read on queue monitor in NS2 manual or internet. Some of the below can be solved by using it. Good Luck rgds Saravanan Kandasamy On Sun, May 19, 2013 at 8:18 PM, Sai Bhyravajosyula sbhyr...@asu.edu wrote: Hello All I have a question regarding queue delay. Is there any way in NS2 to know the number of packets present in the queue of a particular node. And also how to calculate what is the time taken to empty the queue if it is full. Please let me know if any one has any idea about the above two. Thanks -- Bhyravajosyula Sai Vishnu Kiran MS in Computer Science mail-id: sbhyr...@asu.edu
Re: [ns] GPSR implementation running out of memory
Anas, You are facing a memory leak. The effect of memory leak aggravated when you run longer simulation time, simulating larger number of nodes or both. Valgrind is good for memory leak detection. It able to show the functions and exact lines of codes that potentially causing some of the memory leaks. In case you have no experience using Valgrind, do spend some time on internet to learn how to setup and test using Valgrind, it has ample of information on this. NS2 does not have automatic garbage collection, thus warrants a manual freeing of allocated memory once an object is no longer needed. Good Luck. rgds Saravanan K On Sun, May 12, 2013 at 6:24 PM, Anas Almajali almaj...@usc.edu wrote: All, I ported GPSR implementation to ns-2 2.34. The examples that come with the implementation work fine. Some of my simulations that have small number of nodes or few events happening work fine too. However, when I increase the number of nodes above 100 nodes and have more events, the simulation runs for a while then aborts. I was checking the memory while running the cases that fail and found that these simulations are consume the whole memory on my machine and off course abort after that. I have 8GB of memory! The same simulations work fine with other routing protocols like AODV and the memory consumption is within limits. Does anyone know were does GPSR goes wrong and consumes the memory? and is there a fix for that? Anas
Re: [ns] explanation of command function in ns2
Hi,
It can be used to invoke codes from TCL.
e.g:
$ns_ at 10.00 stop
stop will be defined at command (e.g app.cc)
Good Luck.
rgds
Saravanan K
On Wed, Apr 10, 2013 at 6:09 AM, shiny shiny@gmail.com wrote:
hi all,
anybody can explain about command() function,how it works and what's the
purpose of that function.Waiting for ur replies frndz...
*example command function in snoop.cc file *
*
*
int
Snoop::command(int argc, const char*const* argv)
{
//Tcl tcl = Tcl::instance();
if (argc == 3) {
if (strcmp(argv[1], llsnoop) == 0) {
parent_ = (LLSnoop *) TclObject::lookup(argv[2]);
if (parent_)
recvtarget_ = parent_-uptarget();
return (TCL_OK);
}
if (strcmp(argv[1], check-rxmit) == 0) {
if (empty_()) {
rxmitStatus_ = SNOOP_PROPAGATE;
return (TCL_OK);
}
Packet *p = pkts_[buftail_];
hdr_snoop *sh = hdr_snoop::access(p);
if (sh-sndTime()!=-1 sh-sndTime()atoi(argv[2])
sh-numRxmit() == 0)
/* candidate for retransmission */
rxmitStatus_ = snoop_rxmit(p);
else
rxmitStatus_ = SNOOP_PROPAGATE;
return (TCL_OK);
}
}
return NsObject::command(argc, argv);
}
--
With Regards,
John Shiny.J
Re: [ns] Computing RxThreshold for long distances
Dear Wben Jab (If thats your name), Looking at your operating frequency your cross over distance is around 86m. Thus when you experiment communication above this distance, the TwoRay propagation takes place anything below though you are using TwoRay only FreeSpace takes into effect. From the both RxThreshold, you will reach 300m and 1000m transmit range respectively. Nothing would be wrong in the RF point of view unless you changed your transmission power or RXThreshold in between. I am not sure where you are reading to confirm your packet receive. This should be done at the physical layer. If you are reading from the MAC layer, if there is a mechanism to define a packet error rate this could be the reason the received packet is discarded due to the failed integrity test of the content of the received packet. Do check on this. Good Luck. Saravanan K On Wed, Mar 27, 2013 at 2:03 PM, wben-...@labri.fr wrote: Dear All, I want to ask about the receving RxThreshold. I compute it for two distances, one with 300m and the other with 1000m, using TwoRayGround propagation model. I have for 300m , the following output: distance = 300 propagation model: TwoRayGround Selected parameters: transmit power: 0.281838 frequency: 9.14e+08 transmit antenna gain: 1 receive antenna gain: 1 system loss: 1 transmit antenna height: 1.5 receive antenna height: 1.5 Receiving threshold RXThresh_ is: 1.76149e-10 Then, I applied with the same parameters for distance 1000m, and I have the following output. distance = 1000 propagation model: TwoRayGround Selected parameters: transmit power: 0.281838 frequency: 9.14e+08 transmit antenna gain: 1 receive antenna gain: 1 system loss: 1 transmit antenna height: 1.5 receive antenna height: 1.5 Receiving threshold RXThresh_ is: 1.42681e-12 I used the first receiving threshold 1.76149e-10 with distance of 300m of communication range. And I find that the communication is close to 300m. However, when I increased the distance with 1000m of communication range (RXThresh_ is: 1.42681e-12), then I found that the maximum communication range between nodes is 550m. It seems strange to me, that's why I want to ask, if I had to change the initialization parameters (Frequency, Transmission Power,..), because I didn't change them (I used them as their default parameters in threshold.cc file). Could you please, give me a hand, and if I have to modify some other parameters in WirelessPhy. Thank you, and Best regards.
Re: [ns] About RXThreshold and CSThreshold calculation
Mate, These values are defined and not calculated. The received power from a packet is what determines if the packet is received or just sensed. This is basic, you would need to a)read the manual b)read the codes in NS2 c)read the appropriate standards d) or simply spend some time on the internet to understand how the Physical and MAC layer works. There are ample of information available on this. It depends how much you are willing to work hard to acquire it. -- SK On Fri, Mar 15, 2013 at 9:53 AM, shiny shiny@gmail.com wrote: Hi frndz, Anybody know where the RXThreshold and CSThreshold values are calculated in ns2 back-end -- With Regards, John Shiny.J
Re: [ns] Phy/Wireless Transmission Power w.r.t Trans Range
Suggest you to read ns manual and look at the sample simulation codes given example folder - SK On 9 Mar 2013, at 11:32, Khadijeh Arabi khadijeh.ar...@gmail.com wrote: Hi In which files and directory can change the Phy/Wireless Transmission Power w.r.t Trans Range?We most add related codes in main tcl code or create another tcl script for this? thanks
Re: [ns] compiling ns-2 problem
Hi, After make, do sudo make install rgds SK On Wed, Feb 13, 2013 at 3:45 PM, Dalia El3wely dalia-el3w...@hotmail.comwrote: after making changes in ns2 c++ files , i tried to rebuild ns2 by using make command, i didn't get any errors, but when i tried to simulate a simple scenario i found that my changes have not been applied !!I'm using ns-2.35 under cygwin + windows 7..even when i tried to print a simple line on my trace file so i've altered cmu-trace.cc file .. changes have not been applied too!! , i don't know if i have to change any files else befor compiling ns2, or what..? Regards, Dalia Elewely.
Re: [ns] conflicting hello process in aodv rfc and aodv.cc
Amar,
Your explanation is not clear and not sure if you are messing up with the
codes without knowing what you like to achieve.
1. Create a minimalistic scenario.
2. Enable Hello Packets.
[Do not touch aodv.cc, it is controlled by a flag in aodv.h, comment out
#define AODV_LINK_LAYER_DETECTION in aodv.h]
3. Observe the trace file if it is operating correctly.
4. If it is not, you need to provide clear details on
-your scenario of interest,
-what is the topology
-its configuration/setup/parameters,
-the changes done in the code,
-what you observed in trace file,
-what you are expecting
-what you think is the next way forward to solve the bottle neck you are
facing.
Good Luck.
rgds
Saravanan K
On Fri, Feb 8, 2013 at 5:25 AM, AmarNath Patra amarnath.pa...@gmail.comwrote:
Hello Everyone,
In the existing AODV code, HELLO is disabled. I am able to enable it (by
commenting '#ifndef AODV_LINK_LAYER_DETECTION' and '#endif' in aodv.cc).
The problem is that after enabling, all the nodes in the network perform
the hello process.
But,according to the rfc3561, *A node SHOULD only use hello messages if it
is part of an active route.*
Please help me to implement this feature (of selective HELLO) in AODV.
By the way, is the implementation of hello process in aodv in ns2.34 *
incorrect*?
I tried to implement this feature in aodv.cc as below:
In the function: HelloTimer::handle(Event*), I put the statement:
agent-sendHello(); inside the condition:* if(agent-rtable.head())*
So I have now:
-
void
HelloTimer::handle(Event*) {
if(agent-rtable.head()){//amar: allowing only the nodes which are
part of any active route to use hello msg, in accrdnc to rfc3561
agent-sendHello();
}
double interval = MinHelloInterval + ((MaxHelloInterval -
MinHelloInterval) * Random::uniform());
assert(interval = 0);
Scheduler::instance().schedule(this, intr, interval);
}
--
Is this implementation correct?
Thanks in advance.
-amar
Re: [ns] recv function not called in aodv for destination node
Dear Amar,
I think you have confused with between mac::recv() and aodv::recv()
1. mac::recv() able to listen every packet in a channel as long as it
is above CSThresh and decode a packet if it is above RXThresh.
2.This is not the same for aodv::recv(), you would need to understand, how
a)AODV protocol works and the components of AODV Table built at nodes
b)wireless mobile node schematic in the NS2 manual.
3.Not every packet received by mac::recv() is sent upstack to
aodv::recv(), only those need to be forwarded will be sent to
aodv::recv(). Thus the final destination node would not go through
aodv:recv but the data packet received by mac:recv will be directly
sent to AGT via LL using uptarget_
4.If you yet to understand this, let me illustrate this in a small
scenario. We have 3 nodes (N3, N4 and N5) arranged in series. N5 sends
one packet to N3.
You will see something as below,
Node: _5 _ recvd data packet at time: 11.5, PacketType: 61, UID: 4
Node: _4 _ recvd data packet at time: 11.501782848, PacketType: 61, UID: 4
if you invoke the below at aodv::recv(),
if(DATA_PACKET(ch-ptype())) {fprintf(stdout,\nNode: _%i _ recvd data
packet at time: %.9lf, PacketType: %i, UID: %i, index, CURRENT_TIME,
ch-ptype(), ch-uid());}
You will see the destination node, i.e N3 is missing.
5. Do compare this with your trace file results,
Line#01 - s 11.5 _5_ AGT --- 4 Poisson 1500 [0 0 0 0 Y Y]
--- [5:1 3:1 32 0 0]
Line#02 - r 11.5 _5_ RTR --- 4 Poisson 1500 [0 0 0 0 Y Y]
--- [5:1 3:1 32 0 0]
Line#03 - s 11.5 _5_ RTR --- 4 Poisson 1520 [0 0 0 0 Y Y]
--- [5:1 3:1 30 2 4]
Line#04 - s 11.500435000 _5_ MAC --- 4 Poisson 1578 [13a 4 5 800 Y Y]
--- [5:1 3:1 30 2 4]
Line#05 - r 11.501757848 _4_ MAC --- 4 Poisson 1520 [13a 4 5 800 Y Y]
--- [5:1 3:1 30 2 4]
Line#06 - s 11.501767848 _4_ MAC --- 0 ACK 38 [0 5 4 0 Y Y]
Line#07 - r 11.501782848 _4_ RTR --- 4 Poisson 1520 [13a 4 5 800 Y Y]
--- [5:1 3:1 30 2 4]
Line#08 - f 11.501782848 _4_ RTR --- 4 Poisson 1520 [13a 4 5 800 Y Y]
--- [5:1 3:1 29 1 3]
Line#09 - r 11.502072515 _5_ MAC --- 0 ACK 38 [0 5 4 0 Y Y]
Line#10 - s 11.502481848 _4_ MAC --- 4 Poisson 1578 [13a 3 4 800 Y Y]
--- [5:1 3:1 29 1 3]
Line#11 - r 11.503804697 _3_ MAC --- 4 Poisson 1520 [13a 3 4 800 Y Y]
--- [5:1 3:1 29 1 3]
Line#12 - s 11.503814697 _3_ MAC --- 0 ACK 38 [0 4 3 0 Y Y]
Line#13 - r 11.503829697 _3_ AGT --- 4 Poisson 1520 [13a 3 4 800 Y Y]
--- [5:1 3:1 29 1 3]
Line#14 - r 11.504119364 _4_ MAC --- 0 ACK 38 [0 4 3 0 Y Y]
You will see RTR (i.e AODV) is received only by the source node and
the intermediary nodes (where forward event need to be executed)
except the destination node.
6. In case you like to know if a destination node received a packet,
you can do so by comparing a packet's destination ip address with
the node_id of a node receiving the packet
Good Luck.
rgds
Saravanan K
On Wed, Feb 6, 2013 at 3:51 PM, AmarNath Patra amarnath.pa...@gmail.com wrote:
Hello Everyone,
If I add the following statement in the beginning of the code in the
function, AODV::recv(Packet *p, Handler*), in aodv.cc :
if(DATA_PACKET(ch-ptype())) { printf(\nNode: _%i _ recvd data packet at
time: %.4lf, index, CURRENT_TIME); }
Then it prints for all active nodes except for the destination. Why is it
happening?
If not in this function/file, then where can I check whether the
destination received a data packet?
I just tried to implement the NULL agent's recv function in c++ source
code, and added the above statement in it.
Here the print function gets executed for the case of destination node. Is
this correct?
Can't I recognize the/a destination node in the aodv,cc file itself?
-amar
Re: [ns] node in wireless 802.11
Hi, Two ways to do it, a) By implementing node-down command as what test-suite-wpan.tcl had done.Look for it in the example folder. It basically free a packet going out of a node and marks the header of a packet as error for incoming packets. b) Try to do what a switched off node should behave. It is not supposed have packets coming in and going out of its interface. Look at the wireless schematic at NS2 manual, channel_ is responsible to put a packet in a channel and uptarget_ is responsible to put a packet in the receiving buffer of a receiving node Try to disable this whenever you need to switch off the node and turn it on whenever the node is supposed to be alive. Good Luck. rgds Saravanan K 2013/2/7 hocine saadi hlim.nar...@gmail.com: hello how can i stop (deactivate) a node in wireless 802.11 network thank you -- Hocine Saadi Chargé d’études au CERIST (CEntre de Recherche en l'Information Scientifique et Technique) Division Théorie et Ingénierie des Systèmes Informatiques (DTISI) 03, Rue frères Aissiou - Ben Aknoun - Alger Ingénieur en Informatique (USTHB)
Re: [ns] recv function not called in aodv for destination node
Amar,
Correction on Line #6,
6. In case you like to know if a destination node received a packet,
you can do so by comparing a packet's destination ip address with
the node_id of a node receiving the packet ***at MAC layer***
rgds
Saravanan K
On Thu, Feb 7, 2013 at 2:19 PM, Saravanan Kandasamy svana...@gmail.com wrote:
Dear Amar,
I think you have confused with between mac::recv() and aodv::recv()
1. mac::recv() able to listen every packet in a channel as long as it
is above CSThresh and decode a packet if it is above RXThresh.
2.This is not the same for aodv::recv(), you would need to understand, how
a)AODV protocol works and the components of AODV Table built at nodes
b)wireless mobile node schematic in the NS2 manual.
3.Not every packet received by mac::recv() is sent upstack to
aodv::recv(), only those need to be forwarded will be sent to
aodv::recv(). Thus the final destination node would not go through
aodv:recv but the data packet received by mac:recv will be directly
sent to AGT via LL using uptarget_
4.If you yet to understand this, let me illustrate this in a small
scenario. We have 3 nodes (N3, N4 and N5) arranged in series. N5 sends
one packet to N3.
You will see something as below,
Node: _5 _ recvd data packet at time: 11.5, PacketType: 61, UID: 4
Node: _4 _ recvd data packet at time: 11.501782848, PacketType: 61, UID: 4
if you invoke the below at aodv::recv(),
if(DATA_PACKET(ch-ptype())) {fprintf(stdout,\nNode: _%i _ recvd data
packet at time: %.9lf, PacketType: %i, UID: %i, index, CURRENT_TIME,
ch-ptype(), ch-uid());}
You will see the destination node, i.e N3 is missing.
5. Do compare this with your trace file results,
Line#01 - s 11.5 _5_ AGT --- 4 Poisson 1500 [0 0 0 0 Y Y]
--- [5:1 3:1 32 0 0]
Line#02 - r 11.5 _5_ RTR --- 4 Poisson 1500 [0 0 0 0 Y Y]
--- [5:1 3:1 32 0 0]
Line#03 - s 11.5 _5_ RTR --- 4 Poisson 1520 [0 0 0 0 Y Y]
--- [5:1 3:1 30 2 4]
Line#04 - s 11.500435000 _5_ MAC --- 4 Poisson 1578 [13a 4 5 800 Y Y]
--- [5:1 3:1 30 2 4]
Line#05 - r 11.501757848 _4_ MAC --- 4 Poisson 1520 [13a 4 5 800 Y Y]
--- [5:1 3:1 30 2 4]
Line#06 - s 11.501767848 _4_ MAC --- 0 ACK 38 [0 5 4 0 Y Y]
Line#07 - r 11.501782848 _4_ RTR --- 4 Poisson 1520 [13a 4 5 800 Y Y]
--- [5:1 3:1 30 2 4]
Line#08 - f 11.501782848 _4_ RTR --- 4 Poisson 1520 [13a 4 5 800 Y Y]
--- [5:1 3:1 29 1 3]
Line#09 - r 11.502072515 _5_ MAC --- 0 ACK 38 [0 5 4 0 Y Y]
Line#10 - s 11.502481848 _4_ MAC --- 4 Poisson 1578 [13a 3 4 800 Y Y]
--- [5:1 3:1 29 1 3]
Line#11 - r 11.503804697 _3_ MAC --- 4 Poisson 1520 [13a 3 4 800 Y Y]
--- [5:1 3:1 29 1 3]
Line#12 - s 11.503814697 _3_ MAC --- 0 ACK 38 [0 4 3 0 Y Y]
Line#13 - r 11.503829697 _3_ AGT --- 4 Poisson 1520 [13a 3 4 800 Y Y]
--- [5:1 3:1 29 1 3]
Line#14 - r 11.504119364 _4_ MAC --- 0 ACK 38 [0 4 3 0 Y Y]
You will see RTR (i.e AODV) is received only by the source node and
the intermediary nodes (where forward event need to be executed)
except the destination node.
6. In case you like to know if a destination node received a packet,
you can do so by comparing a packet's destination ip address with
the node_id of a node receiving the packet
Good Luck.
rgds
Saravanan K
On Wed, Feb 6, 2013 at 3:51 PM, AmarNath Patra amarnath.pa...@gmail.com
wrote:
Hello Everyone,
If I add the following statement in the beginning of the code in the
function, AODV::recv(Packet *p, Handler*), in aodv.cc :
if(DATA_PACKET(ch-ptype())) { printf(\nNode: _%i _ recvd data packet at
time: %.4lf, index, CURRENT_TIME); }
Then it prints for all active nodes except for the destination. Why is it
happening?
If not in this function/file, then where can I check whether the
destination received a data packet?
I just tried to implement the NULL agent's recv function in c++ source
code, and added the above statement in it.
Here the print function gets executed for the case of destination node. Is
this correct?
Can't I recognize the/a destination node in the aodv,cc file itself?
-amar
Re: [ns] Regarding Re-compile error
Dear Gopi. The compiler error did told you what to do. You need to run configure. Any changes in Makefile would require fresh configure. rgds Saravanan K On Sun, Feb 3, 2013 at 6:40 AM, Gopi gopi_...@yahoo.co.in wrote: Dear ns-users, i am getting the following error while re-compiling, after modifications in makefile.in... Makefile.in is newer than Makefile. You need to re-run configure. false make: *** [Makefile] Error 1 can anyone help me to fix the error... Regards, T.Gopi.
Re: [ns] Code for editing packet header
Magdy,
I have not worked adding a new field in packet header in IP layer.
Nevertheless, just throwing some thoughts,
1. Have you included int tag_; in your Agent.h?
2. In MAC layer we have to mention the size of new field, one of the
purpose is, it could be factored in for the transmission time over
physical layer considering longer packet size now.Do see if the same
needed to be done for IP packet.
Good Luck.
rgds
Saravanan K
On Sat, Feb 2, 2013 at 9:18 PM, Magdy Fares mfare...@yahoo.com wrote:
How are you Sir,
In my project i need the code to do the following:
While the packet passes through the nodes in the path from the sender to the
receiver, each node has a unique id consists of for example 3 or 4 bits, and
there is a field of 16 bits in each packet header that holds the node id
after XORing it with the old value.
I acctually did the following:
1- In the structure hdr_ip in the file ip.h , i added a variable of type int
named tag_ to hold the node's id after doing XOR with the old values as i
said befor.
2- And also in the same place i added an access function lkie this int
tag() {return tag_;}
3- In the file ip.cc, in the function export_offsets() , i added this line
field_offset(tag_, OFFSET(hdr_ip, tag_));
I think, by these above three steps i added a new field in the packet headers
that carry the nodes id after doing XOR between old and new values.
In the file agent.cc, and in the function Agent::initpkt() , i added these
two lines:
iph-tag() = 3;
printf(\n This packet has a tag of %d, iph-tag_);
I think these two lines are used for debugging.
So, if these steps are correcet, is there any one can help me to build on
them to finish my task, please i need your help Urgently
Thank you friends,
Eng. Magdy Fadel
From: Magdy Fares mfare...@yahoo.com
To: ns-users@isi.edu ns-users@isi.edu
Sent: Saturday, February 2, 2013 12:14 AM
Subject: Code for editing packet header
To NS-Users,
I am a Ph.D. student of and part of my project trys to XOR some
data in the packet header while it travrses from the source to the
destination. So i *urgently* need code to accomplish this point please.
So, Any One have code for this plz forward it **Urgently.**
Thanks and regards,
Magdy
Fadel
Re: [ns] Regarding Routing
Gopi, Have you tried to google? Much information is there, just need to spend some time doing research. 1. For single hop network you dont need routing. You may use dumbagent. 2. There are some implementation for static routing in the web, some uses DSR as base and some created their own way for filling the routing table. Check out for NOAH or FixRT. Good luck. rgds Saravanan K On Wed, Jan 30, 2013 at 5:59 AM, gopi gopi_...@yahoo.co.in wrote: Dear ns users, can anyone tell me, how to add static routing for wireless network... Regards, T.Gopi.
Re: [ns] how to access the variables in .cc files?
Dear Shiny, This is a more of a programming question rather than NS2. Perhaps you can check with other programming related forums. In the programming point of view for sure it can be done but you have to check if it is logically sound from simulator or real life implementation point of view. Assume you like to read a content of source node address of an ACK packet from MAC layer (mac-802.11.cc) at Physical Layer (wireless-phy.cc), since current frame format of ACK does not carry that information, you may create a new field to carry this information for you. So when you read it at physical layer, your are not only reading the variables from two different files, but also logically sound, as you are reading the packet content which flows from MAC to Physical layer when it flows out from destination (Data) node. Good Luck. rgds Saravanan K On Wed, Jan 30, 2013 at 4:29 AM, shiny shiny@gmail.com wrote: hi all, how to include variables from one .cc file to other? -- With Regards, John Shiny.J
Re: [ns] Bind a float
Dear Rafeal, I am not sure where you like to do this binding. When you declare your variable number_ in file.h ensure you choose a data structure that accepts a float, e.g double number_; rgds Saravanan K On Mon, Jan 28, 2013 at 7:07 PM, Rafael P B Mota rafaelpera...@gmail.com wrote: How can I bind a float member ? For example, when I bind an integer (bind(value_,value_) it works. When I bind a float (bind(number_,number_) I receive errors. What can I do to solve this problem ? Thanks, -- Rafael Perazzo B Mota rafaelpera...@gmail.com Web-page: https://sites.google.com/site/rafaelperazzo/ Doutorando em Ciência da Computação Universidade de São Paulo (USP) Campus da Capital Instituto de Matemática e estatística (IME) --
Re: [ns] Transmission range
Rafael, You would need to spend more time with NS2 manual. 1. How can I change the transmission power to allow 2 nodes communicate themselves at a max distance of 5m ? It depends on the propagation model you are using. Since its just 5 m, you may check Friis as Two Way Ground behaves as Friis as it operate below cut off frequency (assuming you are operating in a frequency above 2GHz). You would find the right Pt_ value when Pr at 5m is =RxThreshold using your preferred propagation model. You may write you own simple code, use excel sheet or even use a built in program in NS2, I think its in the folder named tools. How can I calculate the Pt_ value ? 2. Refer above. What does a 0.28 Pt_ value mean ? 3. Its 0.28W rgds Saravanan K On Sat, Jan 26, 2013 at 7:56 PM, Rafael P B Mota rafaelpera...@gmail.com wrote: How can I change the transmission power to allow 2 nodes communicate themselves at a max distance of 5m ? How can I calculate the Pt_ value ? What does a 0.28 Pt_ value mean ? Thanks
Re: [ns] Packet loss effect on End2End Delay
Saleem, Why not create a test scenario in NS2 and find out the answer. You may induce packet loss systematically and observe your preferred parameter. rgds Saravanan K On Wed, Jan 30, 2013 at 11:03 AM, saleem khan star_s...@yahoo.com wrote: Hi All, is there any effect of packet loss on End2End Delay in OLSR routing protocol? For example if a routing protocol has more packet loss then wat about the end2end delay..either it will be increasing or decreasing with packet loss? Thanks in advance Muhammad Saleem Khan Ph.D(CS) , COMSATS Institute of Information Technology, Islamabad. Cell No# 0346-9754454
Re: [ns] Regarding Scheduling a channel access.
Why you want to do that? Aint the objective of a network is to provide as much throughput as you can? You said nothing about your setup, protocols you are using etc. Dont have the liberty to assume ourselves. A typical reason on getting lack of support -- SK On Mon, Feb 4, 2013 at 10:54 PM, Sai Bhyravajosyula sbhyr...@asu.edu wrote: Hi all I need some help. How can I make a node to access the channel a particular number of times. I mean suppose I have a number like 400 , then how can I make a node to transmit only 400 times and rest of the time in backoff. Please help me .Thanks in advance. Thanks. -- Bhyravajosyula Sai Vishnu Kiran MS in Computer Science mail-id: sbhyr...@asu.edu
Re: [ns] Regarding Scheduling a channel access.
Hi, Do note it is no longer 802.11 once done the below changes. Your network might crumble after the 400th packets as the queue works as FIFO, only when a packet goes out another will replace it. There are two ways to do this, 1. Open ns manual and look for mobile node schema for wireless diagram. Do see which variable places the actual packet in channel. Look for the variable in your code, put a counter there, anything above it you can trigger channel as busy. 2. Since you are testing only cbr. Can generate only 400 packets and increase the queue size to accommodate 400 packets or more. Can measure fairness while not compromising the integrity of the protocols. If like to test say 500pkts on the same network, can do the same but with queue size 500 pkts or more. It becomes like infinite queue scenario. rgds Saravanan K On Mon, Feb 4, 2013 at 11:24 PM, Sai Bhyravajosyula sbhyr...@asu.edu wrote: Thanks for the reply. Rather than throughput the concept here is the fairness. Setup protocols : MAC802.11 , AODV,CBR in UDP. Main objective is to use a magical number in sensing or accessing the channel. Please let me know if you have any further questions. On Mon, Feb 4, 2013 at 4:19 PM, Saravanan Kandasamy svana...@gmail.com wrote: Why you want to do that? Aint the objective of a network is to provide as much throughput as you can? You said nothing about your setup, protocols you are using etc. Dont have the liberty to assume ourselves. A typical reason on getting lack of support -- SK On Mon, Feb 4, 2013 at 10:54 PM, Sai Bhyravajosyula sbhyr...@asu.edu wrote: Hi all I need some help. How can I make a node to access the channel a particular number of times. I mean suppose I have a number like 400 , then how can I make a node to transmit only 400 times and rest of the time in backoff. Please help me .Thanks in advance. Thanks. -- Bhyravajosyula Sai Vishnu Kiran MS in Computer Science mail-id: sbhyr...@asu.edu -- Bhyravajosyula Sai Vishnu Kiran MS in Computer Science mail-id: sbhyr...@asu.edu
Re: [ns] Schedule the backoff timer in mac-802_11
Dear Falahati, Doing a flow chart for 802.11 MAC for NS2 is very good. It is not a easy task though as if you go deeper you will see 3 different flows you must understand. 1. The event flow - How one event calls another 2. The state flow - For instance, how MAC states e.g tx_state or rx_state changes, when tx_active activated 3. Timer Management flow - RxTimer, TxTimer, DeferTimer, BackOffTimer etc managed. The flow chart you have shared, is incomplete as not explored all the branches, missing some process and have errors, thus the given flowchart is not good to understand the 802.11 MAC. I have reviewed the first block, Refer: http://www.pixentral.com/show.php?picture=1WK7gXjz96e6klBBw32eI0KcBS2zro Not to get disheartened on the effort. Suggest you to continually working on it, eventually it will be correct. Good Luck. rgds Saravanan K On Fri, Dec 7, 2012 at 10:12 AM, M Falahati md.falah...@gmail.com wrote: Hello Thanks for your reply. Ms Bostanipour, I hope that continuation of our discussion solve some problems. Yesterday, i was drawing the flowchart with my viewpoint of NS-2 codes. Please see the flowchart from herehttp://www.pixentral.com/show.php?picture=11IMy2iqu2fgUFjOfZDnEa1LoRLl0. I think this flowchart is good for better understanding of Mac-802_11 mechanism. *I have a suggestion:* If you agree, please check this flowchart that we can continue our discussion about Mac-802_11 mechanism in details. *Note:* this flowchart has drawn to present the send mechanism of broadcast data packets in Mac-802_11. Sincerely Yours.
Re: [ns] Schedule the backoff timer in mac-802_11
Yes, it is correct for the specific case you are handling. When I switched to the picture got the impression its for the generic case. My bad -- SK On Fri, Dec 7, 2012 at 12:34 PM, M Falahati md.falah...@gmail.com wrote: Dear Kandasamy, Thank you very much for your guidance. I agree with you that flowchart is incomplete and i try to complete it through the assistance of you and other NS users. But i told: 1) Note: this flowchart has drawn to present the send mechanism of broadcast data packets in Mac-802_11. Since i just consider the send mechanism from upper layer to lower layer in MAC, then i ignored Is Dir Down? No. Also i think sendRTS() function does not do anything for broadcasting data packet, then i ignored it. 2) I was drawing the flowchart with my viewpoint of NS-2 codes (I'm working with NS-2.35). In Ns-2.35 bugFix_timer_ parameter is defined. Also i think that insend() function if Is MAC IDLE? No then DIFS will set to zero by default. In this case, the start function invokes with two arguments. Sincerely Yours.
Re: [ns] Default Channel bandwidth in 802.11?
Dear Behnaz, Looks like you don't quite understand how MAC 802.11 works. Phy/WirelessPhy set bandwidth_ 2e6 will only be used if you have not set basicRate_ or dataRate_ in your MAC setup. Even so the transmission time does not do packet size/channel bandwidth, suggest you to study how Mac802_11::txtime(double psz, double drt) function works in mac-802.11.cc Good Luck. rgds Saravanan K On Sun, Dec 2, 2012 at 1:02 PM, Behnaz Bostanipour behnaz.bostanip...@unil.ch wrote: Hello, I would like to calculate transmission time (tx_time) for packets sent by CMU MAC 802.11. Usually we have tx_time=packet size/channel bandwidth. I looked in the ns-default.tcl file and I have found this value: Phy/WirelessPhy set bandwidth_ 2e6 Is this the value used for calculation of tx_time by 802.11? Thanks, Behnaz
Re: [ns] to recover the RSS value
Hi, I am not so clear on your description. 1. Where do you want to retrieve the Pr value, in mac/wireless-phy.cc or else where? 2. If within mac/wireless-phy.cc, you may use Pr or p-txinfo_.getTxPr() depending the function where you are invoking the value. rgds Saravanan K On Sat, Nov 3, 2012 at 8:39 AM, Basma Bejaoui bejaoui.ba...@gmail.comwrote: Hi every body , i'm trying to recover RSS value in a handover procedure, I use this instruction defined in mac/wirelss-phy.cc p-txinfo_.RxPr but the value is always null ?? why ? and how can I resolve this problem?? thx in advance -- *Cordialement* *Basma Bejaoui* *Ingénieur Informatique, Génie Télécommunication et Réseaux * *+216 20 09 52 02 *
Re: [ns] debugging ns-2 using eclipse
Dear Dejene, Perhaps you got the notion of debugging wrongly. Eclipse does not find one the erroneous part, it simply assist to pause the simulation midway at your predefined location and walk with you the simulation in a controlled way till an anomaly occurs. Try doing some tutorial first to get some grip before pursuing the debugging process on your own. (Try to Google for the tutorial) I am little bit confused though, you mentioned you did some sample simulation (presume its a code with an error) and found the Eclipse configured correctly. If it is true than you would already have some idea on the debugging process by now. rgds Saravanan K On Wed, Sep 19, 2012 at 8:23 PM, Dejene B. djz...@gmail.com wrote: Hi all, I am debugging ns-2 while running simulations using eclipse. I have configured eclipse correctly and have tested it by some sample simulation and it is working. My problem is, I am not able to find in the debugger how to trace an erroneous part. It simply terminates and don't show which part of the code has a problem. Anyone who is experienced please help!! regards -- *Dejene Boru* *. * Graduate Student-Telecom Eng University of Trento Via Brennero 150 Trento, Italy dejeneboru.oljir...@unitn.it djz...@gmail.com 0039-388-998-1919 * *
Re: [ns] Eliminating Packet Loss
Dear Gregory Butron, 1. To answer your question directly, yes, it is possible. But that approach does not make sense, as you would compromise the integrity of a simulator. For e.g when a frame is currently being received by a receiver node and another new frame arrives overlapping in time, only the strongest frame will be received by the receiving node. The weaker frame will be discarded due to collision by IEEE 802.11 MAC i.e one of the typical frame loss scenario. Modifying the simulator to accept both frames does not make sense from Physical or MAC layer point of view. 2. What I would suggest is to mark frames lost due to propagation model separately than any other frame loss scenarios. Later you can do you own accounting to find the loss incurred due to propagation model. Try to Google on how to do this. 3. The method in #2 above is practical and accommodate your requirement, as, when a MAC send a frame from a transmitting node, it goes through a wireless channel with a certain propagation model, when received by a receiving node, test will be done to see if there is any error caused by the propagation model. The below function line would interest you WirelessPhy::sendUp in Wireless-phy.cc Good Luck. rgds Saravanan K On Thu, Sep 20, 2012 at 1:35 PM, Gregory Butron gregorybut...@oru.eduwrote: I am working on a wireless network simulation where I want to look solely at packet loss caused by fading (using the Nakagami propagation model). Is there a way to disable all other forms of packet loss?I am using NS2.35 on Linux Mint 12. Any help is very much appreciated, Gregory Butron
Re: [ns] debuggin ns2
Hi, NS2 as you already know has two part, the TCL part for the front end and C++ part for the back end. To Debug C++ you can you test based debugging tool such as GDB or GUI based debugging tool such as Eclipse or DDD. I assume you are looking for a TCL Debugger. There are several you may try TCL Debug (Don Lib) or the improved version of it such as NSTK (TCL Debug+Mash+TKCON) rgds Saravanan K On Tue, Sep 4, 2012 at 2:54 PM, Dejene B. djz...@gmail.com wrote: Hi all, I want to debug ns-2 while running simulation using eclipse. I succeeded in debugging ns-2 executable but now want to debug when running tcl code simulation. I really appreciate if someone has tried before. thanks, -- *Dejene Boru* *. * Graduate Student-Telecom Eng University of Trento Via Brennero 150 Trento, Italy dejeneboru.oljir...@unitn.it djz...@gmail.com 0039-388-998-1919 * *
Re: [ns] Error displayed in running tcl scripts in ns2-32
I guess you are trying to run your simulation using NAM. Allow your simulation to complete fully before using the time slide bar. Dont stop the simulation midway using NAM then try to forward it to another time. It breaks at some machine. One way to validate if there is anything wrong with your script, disable NAM and try to run it to see if it can get compiled. If yes, there is nothing wrong in your script. Good Luck -- SK On Thu, Aug 23, 2012 at 6:13 AM, Manjula Raja rajamanjulase...@gmail.comwrote: Hello friends! When i try to run any tcl script in ns-2.32, i am facing the flowing error Missing required flag -x in: W -t 150 Missing required flag -y in: W -t 150 Parsing error in event. Can any body help me out in this regard? Will be much obliged Regards -- **R.Manjula Research Scholar Dept of EECE IIT Kharagpur West Bengal ** -- **R.Manjula Sr.Lecturer, Dept of ECE BITM, Bellary Karnataka. Current Status: Research Scholar Dept of EECE IIT Kharagpur West Bengal **
Re: [ns] How to find vehicle route information
Ajmal, NS2 does not know map, it only moves a node from point A to point B in straight line in a given velocity. Assume Node 0 is positioned at (100,100), if it is moving in one direction is, $ns_ at 0.0 $node_(0) setdest 150.0 150.0 1.0 to move in the opposite direction is, $ns_ at 0.0 $node_(0) setdest 50.0 50.0 1.0 Do note it has no negative value as the point of origin is (0,0) Good Luck. rgds Saravanan K On Wed, Aug 22, 2012 at 6:28 AM, ajmal khan engaj...@yahoo.com wrote: Dear all Hi I am working on VANET. I need to know how to find a route of a vehicle. I can generate mobility traces of vehicles in VanetMobisim and it looks like this. $ns_ at 0.0 $node_(0) setdest 714.9497484683059 494.9497484683058 0.75267607 i.e. node 0 will move towards mentioned (x,y) coordinates at speed of 0.752 but it does not give any information which route it will follow on a given map. Please help me how to figure out the routes of vehicles. If there is any other tool that can help. please mention that as well. Also i would like to know how to find that a vehicle is moving in opposite direction. your help will be greatly appreciated. Thanks in advance AJMAL KHAN Ph.D Scholar Telecommunication Networks Lab School of Electrical Engineering and Computer Science Kyungpook National University Cell : +82 (10) 7732-3885
Re: [ns] segmentation problem
Dear Sunil Kumar, Segmentation Fault is a very common problem faced by NS2 users. It has to do with memory such as trying to access an address that cannot physically be addressed, thus an exception has been called. It can happen either in C++ side or at TCL side. The below looks like happening from C++ side to me. Thought the problem is very common, unfortunately the cause of the Segmentation Fault are very wide. It takes more than providing couple of preceding error lines to solve it. The right way to handle a Segmentation Fault is by debugging the code. To start with, if your simulation scenario involves 50 nodes, see if you could replicate the problem in the smallest possible number of nodes to simplify your debugging process. For C++ debugging you can use GDB or even putting simple printf lines around node 0 received `UPD` from non-neighbor 5 lines to see if the change of variables, memory allocation and function calls are done per your need. It will take some time to understand how GDB codes work for first time user and a certain amount of troubleshooting effort., once you get used to it, it will be easy. After finding where the abnormality occur, work your way up the code to know what caused the abnormality and rectify the problem. Its very rare another person could able to help you to solve Segmentation Fault without looking at all the codes. Good Luck. rgds Saravanan Kandasamy On Wed, Aug 8, 2012 at 5:08 AM, sunil kumar scientist@gmail.com wrote: hello every one I am working with ns-2.35 in windows environment. For ODMRP protocol if number of nodes increased above 10 then simulation running successfully for 99% of simulation time and aborted with the message segmentation fault(core dumped)... what happend? can any one tell the solution for this...? thanks in advance
Re: [ns] Ignoring collisions during simulation
Dear Lopes,
Its not a problem if a receiving node receives only one packet, as
collision would not be induced. If another packet arrives during the
receiving of the first packet, this where a collision would be
induced. If you can decide what you like to do with the later packet,
then its possible to make simulation without considering collision,
though I cant find a reason why a person would want to do that.
If you are using 802.11 MAC, the below line will be of your interest
in Mac802_11::recv function,
if(pktRx_-txinfo_.RxPr / p-txinfo_.RxPr = p-txinfo_.CPThresh) {
capture(p);
} else {
collision(p);
}
Good Luck.
rgds
Saravanan K
On Mon, Aug 6, 2012 at 6:35 PM, efrenlopes efrenlo...@gmail.com wrote:
Hello!
Is there any way to make simulations without considering the collision of
packets in wireless networks?
Thank you!
--
View this message in context:
http://old.nabble.com/Ignoring-collisions-during-simulation-tp34261426p34261426.html
Sent from the ns-users mailing list archive at Nabble.com.
Re: [ns] need help on understanding Scheduler::instance().clock()
Dear Hongsheng Lu,
Scheduler::instance().clock() has 9 decimal point accuracy, most of
the time it will be different.
Even you are calling it in the same file and in the same function, you
might end up completely different timings. You can either use a
debugger or simply printf statements to understand this.
For instance, assume you have a topology of two wireless nodes, T and
R where T transmits a data packet to R using 802.11 MAC.
Try to put a printf statement calling scheduler::instance().clock()
directly before send(p,h) at,
if(hdr-direction() == hdr_cmn::DOWN) {
send(p, h);
return;
}
and another printf statement directly after the IF loop.
in Mac802_11::recv function in mac-802_11.cc file
You will see completely different clock information as it is not a
systems time but simulated time. The first timing information related
when T sends a packet and the second timing information related when R
received a packet at the MAC layer which accounts a link delay among
other timing parameter.
By just shifting the printf statement couple of lines in the same
function you are already at a different node location.
Good Luck.
rgds
Saravanan K
On Sat, Aug 4, 2012 at 2:45 AM, Hongsheng Lu h...@nd.edu wrote:
Hi there,
I am a newer to NS2. Could anyone tells me
how Scheduler::instance().clock() works? In particular,
when Scheduler::instance().clock() are called at two different places in
the program (might be in different methods or classes), how can I tell
whether they return the same or different time? Thanks a lot.
--
Best Regards,
Hongsheng Lu
Re: [ns] RXThresh values!!
Dear Wben, I presume you like to know the relationship between distance vs RXthresh ? It might not be that straight forward as it depends on which multipath propagation you like to use. Assume this topology -Two nodes (T and R), node T would be transmitting to node R placed x meter away. You need to know, 1. Frequency you like to operate 2. Which multipath propagation you like to use. 3. Transmit power 4. Gain of antenna 5. Height of the transmitter and receiver Assume Two-Ray Ground Reflection Model Method 1. Using the frequency, calculate the cut off distance (m) using (4*PI*ht*hr)/lambda where lambda is c/freq, ht and hr is the height of T and R. 2. If the T-R separation is below the cut off distance, use Friis Equation, if it is above the cut off distance use two-ray reflection model. 3. The Pr is the RXThresh you need to set in your simulation varying the distance from the Friis/Two-ray ground reflection equation which you can easily get from the internet. So when you get 300m using 1.76149e-10W RxThresh most likely you used two-ray ground reflection model operating at 2.4GHz frequency. Good luck. rgds Saravanan K On Sat, Aug 4, 2012 at 2:18 PM, wben-...@labri.fr wrote: Dear all, Has anyone an idea about the different corresponding values of the parameter RXThresh, when varying the distances. Or when I could find these values? set RXThresh 1.76149e-10 ;#compute with threshold.cc for distance 300m Thanks.
Re: [ns] installing ns2.34 on ubuntu 11.10 64 bit error while installing
Hi, There are several writeup which would be of help to you. Refer: [1] http://erl1.wordpress.com/2011/05/12/installing-ns-2-34-on-ubuntu-11-04/ [2] http://www.pradeepkumar.org/2011/07/installing-network-simulator-2-ns2-34-in-ubuntu-11-04.html Good Luck. rgds Saravanan K On Sat, Jul 14, 2012 at 6:51 PM, Ajinkya kadam ajenkya.ka...@gmail.com wrote: i am currently using ubuntu 11.10 64-bit , and while installing ns2.34 i am getting a compiling error in tools/ranvar.cc line 213 and 561 what should i do to remove it ???
Re: [ns] Implementing TORA in NS-2.34
Dear Rahul Sharma, Segmentation Fault is a very common problem faced by NS2 users. It has to do with memory such as trying to access an address that cannot physically be addressed, thus an exception has been called. It can happen either in C++ side or at TCL side. The below looks like happening from C++ side to me. Thought the problem is very common, unfortunately the cause of the Segmentation Fault are very wide. It takes more than providing couple of preceding error lines to solve it. The right way to handle a Segmentation Fault is by debugging the code. To start with, if your simulation scenario involves 50 nodes, see if you could replicate the problem in the smallest possible number of nodes to simplify your debugging process. For C++ debugging you can use GDB or even putting simple printf lines around node 0 received `UPD` from non-neighbor 5 lines to see if the change of variables, memory allocation and function calls are done per your need. It will take some time to understand how GDB codes work for first time user and a certain amount of troubleshooting effort., once you get used to it, it will be easy. After finding where the abnormality occur, work your way up the code to know what caused the abnormality and rectify the problem. Its very rare another person could able to help you to solve Segmentation Fault without looking at all the codes. Good Luck. rgds Saravanan Kandasamy On Fri, Jul 6, 2012 at 9:58 AM, Rahul Sharma wireless.ra...@gmail.comwrote: Hi All, I tried simulating TORA in NS-2.34 for 20 nodes. For some time of execution i receive the output as below and than suddenly it shows Segmentation fault: node 165506090 received `UPD` from non-neighbor 17 node 165506090 received `UPD` from non-neighbor 17 node 165506090 received `UPD` from non-neighbor 17 node 0 received `UPD` from non-neighbor 1 node 0 received `UPD` from non-neighbor 1 node 0 received `UPD` from non-neighbor 16 node 0 received `UPD` from non-neighbor 16 node 0 received `UPD` from non-neighbor 16 node 0 received `UPD` from non-neighbor 16 node 0 received `UPD` from non-neighbor 5 node 0 received `UPD` from non-neighbor 5 node 0 received `UPD` from non-neighbor 5 node 0 received `UPD` from non-neighbor 5 node 0 received `UPD` from non-neighbor 5 node 0 received `UPD` from non-neighbor 5 node 0 received `UPD` from non-neighbor 5 node 0 received `UPD` from non-neighbor 5 node 0 received `UPD` from non-neighbor 5 node 0 received `UPD` from non-neighbor 5 node 0 received `UPD` from non-neighbor 5 node 0 received `UPD` from non-neighbor 5 node 0 received `UPD` from non-neighbor 5 *Segmentation fault* Can anyone suggest some way to solve this? I need it urgently, kindly help On Thu, Jul 5, 2012 at 2:49 PM, Durgesh Kshirsagar durgeshpkshirsa...@gmail.com wrote: Hi Rahul, you can solve the segmentation fault by remaking the ns2. If it doesn't solve try to reinstall the ns2 and check. All the best!
[ns] Preamble/Frame Body Capture Threshold - IEEE 802.11b
Dear All, If a stronger frame (P1) arrive during the reception of a weaker frame (P2) by a certain threshold (dB), a MAC (802.11) in NS2 will decide it as a collision. However in hardware implementation for e.g in Prism chipset, P1 can still be captured if it arrives within P2's preamble time (Preamble Capture) and in Atheros chipset, P1 can be captured even if it arrives after P2's preamble time (Frame Body Capture) [1]. Settings in [2], MAC = IEEE 802.11p Preamble Capture Threshold = 5dB Frame Body Capture Threshold = 10dB Settings in [3], MAC = IEEE 802.11p Preamble Capture Threshold = 4dB Frame Body Capture Threshold = 10dB Settings in [4], MAC = IEEE 802.11a (5.9GHz) Preamble Capture Threshold = 4dB Frame Body Capture Threshold = 10dB These capture thresholds very much dependent on the datarate, chipset manufacturer's parameter setting etc. It is not defined by the standard. Anyone aware the optimal/chipset manufacturer setting for IEEE 802.11b (e.g 11Mbps) for Preamble and Frame Body Capture Threshold ? Would appreciate if you could point me to some papers or web URL's for my further reading. My search have not been fruitful thus far. rgds Saravanan K Reference: [1] Jiho Ryu, Jeongkeun Lee, Sung-Ju Lee, and Taekyoung Kwon, Revamping the IEEE 802.11a PHY simulation models, in Proceedings of the 11th international symposium on Modeling, analysis and simulation of wireless and mobile systems (MSWiM '08), pp 28-36, New York, USA [2] Hannes Hartenstein, Kenneth Laberteaux, VANET: Vehicular Applications and Inter-Networking Technologies, Wiley, [3] Moritz Killat* and Hannes Hartenstein, An Empirical Model for Probability of Packet Reception in Vehicular Ad Hoc Networks, EURASIP Journal on Wireless Communications and Networking, 2009 [4] Byungjin Cho, A Simulation study on Interference in CSMA/CA Ad-Hoc Networks using Point Process, Masters Thesis, Aaltoo University, 2010
[ns] TENS1.2 on NS2.33 (Ubuntu 8.10)
Hi, I am new to NS2. Have anyone successfully installed TENS1.2 on NS2.33 running on Ubuntu 8.10 ? Need some pointers. I could be reached at svanan77[at]gmail[dot]com rgds Saravanan K
