1. Chapter 16 Mobile Networking in ns
Presenter: Wu-Hong Tsai
Date: 2010/11/01

2. Wireless mode consists of MobileNode
MobileNode + additional features  multi-hops ad- hoc networks, wireless LAN etc.
MobileNode is a split object.
MobileNode = basic Node object +
moving ability within a given topology,
receiving and transmitting signal from and to the wireless channel
A major difference between MobileNode and Node
MobileNode is not connected Links  Nodes
 MobileNodes

4. Creating wireless topology
Four ad-hoc routing protocols
Destination Sequence Distance Vector (DSDV)
Dynamic Source Routing (DSR)
Temporally Ordered Routing Algorithm (TORA)
Ad-hoc On-demand Distance Vector (AODV)
Code Examples
~/ns-2.34/tcl/ex/simple-wireless.tcl
~/ns-2.34/tcl/ex/wireless-test.tcl

7. Creating Node movements
Code Examples:

8. Different MAC layer protocols for mobile networking
MAC protocol
Contention based MAC protocol
Preamble based TDMA protocol
Time slots
Currently, ns supports a single hop, preamble-based TDMA MAC protocol
GSM, …

9. Different types of Routing Agents in mobile networking
DSDV
DSR
TORA
AODV

10. Trace support
The trace support for wireless simulations currently use cmu-trace objects.
CMUTrace/Drop,
CMUTrace/Recv,
CMUTrace/Send
Example:
r _6_ RTR tcp 1492 [a ]
[65536: : ] [1 0] 2 0
Node ID: 6, UID: 5, TCP packet, Header Size: 1492, Channel: a2
65536:0 = = 0.1.0:0, :0 = = 1.0.3:0
TTL: 31, TCP seqno, ackno: [1 0]

11. Extensions made to CMU’s wireless model (1/2)
Wireless model extended wired + wireless  wired-cum-wireless
Wireless model:
multi-hop ad-hoc networks or
wireless LAN
Wireless model extended:
Multiple WLANs connected through wired node
mobileIP

12. Extensions made to CMU’s wireless model (2/2)
Routing considerations:
Wireless model has no Links concept, wired nodes  wireless nodes?
BaseStationNode