ns2 | 易学教程

NS2移动节点

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　　MobileNode 是基本的ns Node对象，但是又具有自己的特性，比如，移动性。MobileNode类派生自Node类。一、创建节点移动模型　　　　有两种机制可以引起移动节点的运动。第一种，需要明确指定节点的起始位置和终止位置，这些位置指令通常放在一个单独的场景文件中。例如： 1 $node set X_ <x1>2 $node set Y_ <y1>3 $node set Z_ <z1>4 $ns at $time $node setdest <x2> <y2> <speed> 　　在$time时刻，节点按照设定的速度从起始位置(x1, y1)向目的地(x2, y2)移动，按照这种方法，节点移动更新在任何需要知道节点位置的时候触发。第二种方式，使用节点随机移动模型： 1 $mobilenode start 　　该命令使节点从随机位置开始运动，并会定期改变节点的方向和速度。移动目的和速度是随机产生的。二、移动节点的网络构建　　移动节点的网络栈是由一系列连接到无线信道的网络构件组成，这些构件包括LL，连接到LL的ARP模块，接口优先级队列（IFq），MAC层，netIF。这些组件由OTcl一起创建和组装。三、无线传播模型　　NS2实现了三种无线传播模型，分别是free space（自由空间）模型，two-way ground reflection

how to access value in tcl script from .cc files

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问题 I'm trying to get value from .cc. In my file , AgentCPU.h and AgentCPU.cc there is a integer called "npkts_" and a function "recv" for receive Packets when I finally finished a packet , I will increase the "npkts_" 1 In further , in my tcl script I want to access the "npkts_" my code is like this set cpu [new Agent\AgentCPU] puts [format "%d" "$cpu set npkts_"] However , ther value is not correct it is same to the value when I construct my AgentCPU like this AgentCPU::AgentCPU(): Agent(PT

How to apply the OSPF patch to ns2 2.35 on ubuntu 14.04

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问题 I have been using ns2 and nam for a long time on my ubuntu. Now I have to apply a patch ( OSPF ) to it. I have been searching for how to apply a patch in linux (as I'm kind of new in it) and all I got was: 1) $ tar xvf ns-allinone-2.35.tar.gz 2) $ cd ns-allinone-2.35/ 3) $ ln -s ns-2.35/ ns-2.34 ... Then the patch will work, except for one line. (commom/packet.h). 4) $ patch -p0 < 10-ospf4ns2.34-base.patch http://sourceforge.net/projects/ospf4ns/ 5) Replace commom/packet.h with the attached

How can I calculate number of hops to reach destination ( NS2 )?

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问题 In NS2 ..in TCL file, how can I calculate number of Hops in one path to reach the destination in wireless Network? I need your help. 回答1: You must do that in the protocol's codes... First of all i don't know which protocol you want to use, but fortunately the protocols in ns2 are very similar to each other... So i will c guide you to how to do it. I will use AODV protocol as a sample... In theory : We'll say when a RREQ packet has arrived, increment the packet hop count for current rout...

what is the value of Pt for range of 20m in ns2

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问题 i want to know how to set value of Pt transmitted power for range transmission Phy/WirelessPhy set Pt_ 0.2818 (gives my signal will travel upto 250m ) this code for 250m but what about authers ranges like 20 or 30m what is the method for calculating Pt? please help 回答1: Another example with distances : ns2.3x/tcl/ex/wpan/wpan_demo4b.tcl → → lines 61 - 77 : # For model 'TwoRayGround' set dist(5m) 7.69113e-06 set dist(9m) 2.37381e-06 set dist(10m) 1.92278e-06 set dist(11m) 1.58908e-06 set dist

invalid command name “Agent/LeachAgent”

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问题 I try to implement a simple scenario for LEACH protocol but I get this error: Creating Sensors ... invalid command name "Agent/LeachAgent" while executing "Agent/LeachAgent create _o2340 " invoked from within "catch "$className create $o $args" msg" invoked from within "if [catch "$className create $o $args" msg] { if [string match "__FAILED_SHADOW_OBJECT_" $msg] { delete $o return "" } global errorInfo error "class $..." (procedure "new" line 3) invoked from within "new Agent/LeachAgent" (

Angle based orientation ns2 not working

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问题 I'm trying to orient the nodes in ns2 using angles. It's not working. What am I doing wrong? set ns [new Simulator] set nf [open out.nam w] $ns namtrace-all $nf set n 4 set router1 [$ns node] set router2 [$ns node] $ns duplex-link $router1 $router2 45Mb 75ms DropTail set x_sndr 50 set x_rcvr 300 set offset 45 set angle [expr -1*$offset*$n/2] $ns duplex-link-op $router1 $router2 orient right for {set i 1} {$i <= $n} {incr i} { set sndr($i) [$ns node] set rcvr($i) [$ns node] $ns duplex-link

Network simulation tool supporting Bluetooth

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问题 We'd like to perform a Bluetooth network simulation. As far as we have researched, Bluetooth module has not been implemented in ns-3 and ns-2 modules recommended in this question have not been updated for years. We have not found any other simulation tool supporting this protocol apart from this mention to Qualnet, which I have not been able to verify on their website. Is there any current network simulation tool that includes a Bluetooth module or should we still use ns-2? 回答1: All the

All nodes that are in Range are not receiving Message in LEACH

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问题 when I send Broadcast notification to other nodes some nodes are not receiving the notification. below is code. Any help is appreciated Thanks int clusterCode; int numCodesAvail; numCodesAvail = 2 * config_.spreading_ - 1; currentCH_ = sensor_node_->nodeid(); currentCHMAC_ = MAC_BROADCAST; clusterCode = (mac_->myADVnum() % numCodesAvail) + 1; setCode(clusterCode); wakeUp(); send( MAC_BROADCAST, LINK_BROADCAST, LEACH_ADV_CH, (char *) (&code_), sizeof(currentCH_), BYTES_ID, config_.maxDist_, 0)

How to find neighbor list in ns2

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问题 I would like to find the neighbor nodes list in sensor network. It would be great help if someone provides me sample tcl script for that. Thanks 回答1: # neighbor node calculation set nbr [open Neighbor w] puts $nbr "\t\t\t\t\tNeighbor Detail" puts $nbr "\t~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" puts $nbr "\tNode\t\tNb node\t\tNode-Xpos\tNode-Ypos\tNb-Xpos\t\tNb-Ypos\t\tDistance(d)" puts $nbr "\t~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~" close $nbr proc distance { n1 n2 nd1 nd2} { global c n