Glomosim scenarios

Creating Scenario in GloMoSim-2.03

A.Kathirvel, AP/CSE
B. S. Abdur Rahman University, Chennai

Outline

Introduction

Input/Output files

Understanding Files/Directories

Design a wired Network

Design a wireless Network

Understanding Transmission range

Discussion

Introduction to scenarios

In GloMoSim, a specific network topology is
referred to as a scenario.

scenario allows the user to specify all the
network components and conditions under
which the network will operate.

Terrain details, channel propagation effects
including path loss, wired and wireless subnets,
network devices, the entire protocol stack of a
variety of standard, and applications running on
the network.

Input Files

3 input files

Scenario Configuration file
− This is the primary input file for GloMoSim and
specifies the network scenario andparameters for the
simulation. This file usually the extension “.in”.

Node placement file
− This file is referenced by the scenario configuration file
and specifies the initial position of nodes in the
scenario. This file usually has the extension “.input”.

Application configuration file
− This file is referenced by the scenario configuration file
and specifies the applications running on the nodes in
the scenario. This file usually has the extension “.conf”.

Output File

GloMoSim Statistics file
− The primary output file generated by a GloMo
simulation run is a statistics file, which has the
extension “.stat”. This file contains the statistics
collected during the simulation run. Other output files
that may be generated by GloMoSim include the trace
file (which has the extension “.trace”) which records
packet traces.

Configuration files located in bin/ directory :
-IN : app.conf : Application execution options
-IN : config.in : Simulation configuration options
-OUT : glomo.stat : Simulation results

GloMoSim Sub-Directories

Main, Include, Bin, Doc, TCPLib, Java_gui

Application

Transport

Network

Mac

Radio

Scenarios

GloMoSim Files

File Extensions:

.pc – C source code

.h - C header files

.pi – Message file created and maintained
internally by Parsec (don’t edit)

Design a Network using GloMoSim

Wired Networks

In this exercise, you will build and configure a simple
wired network of four nodes connected with point-to-
point links shown in the following figure.


By reducing the transmission rate of a link to create a
"bottleneck", you will find how applications overwhelm
the link and cause significant packet loss.

Normal situation
( PDR = 100 % )

Solution

Step 1: Node placement

Step 2: Wired link definition

Step 3: Creation of routing table

Step 4: Application selection

Step 5: Configuration

Step 6: Execution & Analysis the Results

Scenario Topology

The topology of a network is defined by the number
and location of network devices and the physical and
logical connections between them.

NODE-PLACEMENT-FILE

Format:

nodeAddr 0 (x, y, z)

The second parameter is for the consistency with the
mobility trace format.

0 0 (250, 250, 0)

1 0 (500, 250, 0)

2 0 (375, 500, 0)

3 0 (375, 750, 0)

wired link definition

Each link is bidirectional, and the bandwidth is
specified in bits per second.

Format:

nodeAddr1 nodeAddr2 bandwidth1 propDelay1
0-----|
|______
|2 3
1-----|

0 2 10000000 1MS
1 2 10000000 1MS
2 3 10000000 1MS

Routing Table (static)

Format: sourceAddr destAddr nextHop
0-----|
|______
|2 3
1-----|

012 022 032

102 122 132

200 211 220

233 302 312

322

Application Layer

The traffic generators currently available are FTP,
FTP/GENERIC, TELNET, CBR, and HTTP.

FTP <src> <dest> <items to send> <start time>

FTP/GENERIC <src> <dest> <items to send> <item size>
<start time> <end time>

TELNET <src> dest> <session duration> <start time>

CBR <src> <dest> <items to send> <item size> <interval>
<start time> <end time>

Client: HTTP <address> <num_of_server> <server_1> ...
<server_n> <start> <thresh>

Server: HTTPD <address>

CBR 0 3 75 512 1MS 0S 30S

CBR 1 3 75 512 1MS 0S 30S

Configure the wired Network

SIMULATION-TIME 100S

SEED 2

TERRAIN-DIMENSIONS (1000, 1000)

NUMBER-OF-NODES 4

NODE-PLACEMENT FILE

NODE-PLACEMENT-FILE ./wired_nodes.input

MOBILITY NONE

PROPAGATION-LIMIT -111.0

PROPAGATION-PATHLOSS FREE-SPACE

RADIO-TYPE RADIO-NONOISE

RADIO-BANDWIDTH 2000000

MAC-PROTOCOL WIRED

WIRED-LINK-FILE wired.conf

Configure the wired Network

NETWORK-PROTOCOL IP

NETWORK-OUTPUT-QUEUE-SIZE-PER-PRIORITY 100

ROUTING-PROTOCOL STATIC

STATIC-ROUTE-FILE wired_route.in

APP-CONFIG-FILE ./wired_app.conf

APPLICATION-STATISTICS YES

TCP-STATISTICS NO

UDP-STATISTICS NO

ROUTING-STATISTICS NO

NETWORK-LAYER-STATISTICS NO

MAC-LAYER-STATISTICS NO

RADIO-LAYER-STATISTICS NO

CHANNEL-LAYER-STATISTICS NO

MOBILITY-STATISTICS NO

Output
Node: 0, Layer: AppCbrClient, (0) Server address: 3
Node: 0, Layer: AppCbrClient, (0) Session status: Closed
Node: 0, Layer: AppCbrClient, (0) Total number of packets sent: 75
Node: 3, Layer: AppCbrServer, (0) Client address: 1
Node: 3, Layer: AppCbrServer, (0) Average end-to-end delay [s]: 0.003365200
Node: 3, Layer: AppCbrServer, (0) Session status: Closed
Node: 3, Layer: AppCbrServer, (0) Total number of packets received: 75
Node: 3, Layer: AppCbrServer, (0) Session status: Closed

Data Packet Dropping Situations

wired link definition

Each link is bidirectional, and the bandwidth is
specified in bits per second.

Format:

nodeAddr1 nodeAddr2 bandwidth1 propDelay1
0-----|
|______
|2 3
1-----|

0 2 10000000 1MS
1 2 10000000 1MS
2 3 1000000 1MS

Output
Node: 3, Layer: AppCbrServer, (0) Session status: Not closed
Node: 3, Layer: AppCbrServer, (0) Session status: Not closed

Solution

Step 1: Node placement

Step 2: Application selection

Step 3: Configuration

Step 4: Execution & Analysis the Results

Application Layer

CBR 0 3 75 512 1NS 10S 30S

CBR 1 3 75 512 1NS 40S 60S

Configure the wireless Network

SIMULATION-TIME 100S

SEED 1

TERRAIN-DIMENSIONS (1000, 1000)

NUMBER-OF-NODES 4

NODE-PLACEMENT FILE

NODE-PLACEMENT-FILE ./wireless_nodes.input


MOBILITY NONE


PROPAGATION-LIMIT -111.0

PROPAGATION-PATHLOSS TWO-RAY

NOISE-FIGURE 10.0

TEMPARATURE 290.0


RADIO-TYPE RADIO-ACCNOISE

RADIO-FREQUENCY 2.4e9

RADIO-BANDWIDTH 2000000

RADIO-TX-POWER 15.0

RADIO-ANTENNA-GAIN 0.0

RADIO-RX-SENSITIVITY -91.0

RADIO-RX-THRESHOLD -81.0


MAC-PROTOCOL 802.11


ROUTING-PROTOCOL BELLMANFORD


NETWORK-PROTOCOL IP

NETWORK-OUTPUT-QUEUE-SIZE-PER-PRIORITY 100

APP-CONFIG-FILE ./wireless_app.conf

APPLICATION-STATISTICS YES

TCP-STATISTICS NO

UDP-STATISTICS NO

ROUTING-STATISTICS NO

NETWORK-LAYER-STATISTICS NO

MAC-LAYER-STATISTICS NO

RADIO-LAYER-STATISTICS NO

CHANNEL-LAYER-STATISTICS NO

MOBILITY-STATISTICS NO

Output




Application Layer
CBR 0 3 75 512 1MS 0S 0S
CBR 1 3 75 512 1MS 0S 0S

Output




Wireless Mobile Ad Hoc Networks

Radio range
[root@localhost Wireless networks]# radio_range
wireless_configuration
radio range: 376.782m
Execution time : 0.0059 sec
Number of events (including timeouts)
processed : 0
Number of messages processed : 0
Number of context switches occurred : 6
Number of Local NULL messages sent : 0
Number of Remote NULL messages sent : 0
Total Number of NULL messages sent : 0

Setting Radio range
Free Space Propagation

The free space propagation model is the simplest path loss model in which there is
a direct path signal between the transmitter and the receiver, with no atmospheric
attenuation or multipath components. In this model the relationship between the
transmitted power Pt and the received power Pr is given by

 Pr = Pt Gt Gr (λ/4Πd )2


Where Gt and Gr are the transmitter and receiver antenna gains, respectively, in the
direction from the transmitter and receiver, d is the distance between the transmitter
and receiver, and λ= c/f is the wavelength the signal.

Setting Radio range
Two Ray Propagation


The two-path model assumes that the signal reaches the receiver through two
paths, one a line-of-sight path, ad the other the path through which the
reflected (or refracted, or scattered) wave is received.

 Pr = Pt Gt Gr (hthr /d2 )2

 Where Pt is the transmitted power, Gt and Gr are the transmitter and receiver

antenna gains, respectively, in the direction from the transmitter and receiver,
d is the distance between the transmitter and receiver, and ht and hr are the

heights of the transmitter and receiver, respectively.

Radio Range Calculation
Input parameters

PROPAGATION-PATHLOSS TWO-RAY


RADIO-TX-POWER 15.0 (dBm)

RADIO-ANTENNA-GAIN 0.0 (dBm) [ isotropic antenna]

RADIO-RX-SENSITIVITY -91.0 (dBm)

RADIO-RX-THRESHOLD -81.0 (dBm)

Given Data
Pt = 15 dBm Pr = -81 dBm c = 3 X 108 f = 2.4 X 109
Gt = Gr = 0 ht = hr = 1.5

PowerdBm = 10 Log (PowermW/1 mW)

PowermW = 10 (PowerdBm/10)

Pt = PowermW = 10 (PowerdBm/10) = 1015/10 = 101.5 = 31.622776 mW
Pr = PowermW = 10 (PowerdBm/10) = 10-81/10 = 10-8.1 = 7.943 X 10-9 mW

Two-Ray Pr = Pt Gt Gr (hthr /d2 )2

____________________________________

d = 4 | 31.62276 X 1.5 X 1.5 X 1.5 X 1.5 / 7.943e-9 = 376.7839

Radio Transmission range = 250 m


Given Data
Pt = 7.88 dBm Pr = -81 dBm c = 3 X 108 f = 2.4 X 109
Gt = Gr = 0 ht = hr = 1.5

Pt = PowermW = 10 (PowerdBm/10) = 107.88/10 = 6.137620052 mW

______________________________________

d = 4 |6.137620052 X 1.5 X 1.5 X 1.5 X 1.5 / 7.943e-9 = 250.08773

Output
wireless_config.in
processed : 0

Input parameters

PROPAGATION-PATHLOSS FREE-SPACE



RADIO-ANTENNA-GAIN 0.0 (dBm) [ isotropic antenna]

RADIO-RX-SENSITIVITY -91.0 (dBm)

RADIO-RX-THRESHOLD -81.0 (dBm)

Given Data
Pt = 15 dBm Pr = -81 dBm c = 3 X 108 f = 2.4 X 109
Gt = Gr = 0 ht = hr = 1.5


Pt = PowermW = 10 (PowerdBm/10) = 1015/10 = 101.5 = 31.622776 mW

FREE-SPACE Pr = Pt Gt Gr (λ /4Πd )2
_________
d = ( | (P / P ) C2 )/ 4Πf
t r

___________________________

d = 4 | (31.62276 / 7.943e-9 ) X (3 e 8)2 / 4 X 3.14 X 2.4 e 9 = 627.57 m

Output
wireless_config.in
processed : 0

Radio Transmission range = 276 m

FREE SPACE

[root@localhost Wireless networks]# radio_range wireless_config.in



Number of events (including timeouts) processed : 0






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