1. Lecture 45 Review of Lectures 26-44 Dr. Ghalib A. Shah
Wireless Networks
Lecture 45
Review of Lectures 26-44
Dr. Ghalib A. Shah

2. Last Lecture 4G Overview Mobility Management Handoffs
Heterogeneous Wireless networks
Evolution
Issues in 4G
Mobility Management
Handoffs
Types, VHO process, VHO Issues
Standards
QoS Considerations

3. 26 - Outlines Overview of IEEE 802.11 IEEE 802.11 Protocols
Architecture
Services
MAC Protocols
DCF
PCF

4. Overview, IEEE 802.11 Committee
Committee formed in 1990
Wide attendance
Multiple Physical Layers
Frequency Hopping Spread Spectrum
Direct Sequence Spread Spectrum
Infrared
2.4GHz Industrial, Scientific & Medical shared unlicensed band
2.4 to GHz with FCC transmitted power limits
2Mb/s & 1Mb/s data transfer

5. 27 - Outlines Problems with DCF Virtual Carrier Sensing
RTC/CTS Protocol
Inter-frame Spacing
PCF
Fragmentation / Reassembly
MAC Frame Format
Frame Types
Physical Media in Original IEEE

6. 28 - Outlines Introduction Routing Protocol What is Ad hoc networks?
Characteristic
Ad hoc vs. cellular networks
Application
Challenges
Routing Protocol
Expected Properties of Ad-hoc Routing Protocols
A taxonomy for routing protocols in Mobile ad
Some common protocols (DSDV, AODV, DSR, ZRP, TORA)

7. 29 - Outlines Types of Attack Goals of 802.11 Security WEP Protocol
WEP Authentication
Security flaws in original

8. How 802.1x Address Security Issues of 802.11
EAP Framework
User Identification & Strong authentication
Dynamic key derivation
Mutual authentication
Per-packet authentication
Dictionary attack precautions

9. Authentication Server
IEEE 802.1X Terminology
Authenticator
Authentication Server
Supplicant
Controlled port
Uncontrolled port

10. 30 - Outlines Limitations of QoS in IEEE 802.11 Overview of 802.11e
EDCF
HCF
QoS is realized by introducing traffic categories (TCs)
Each instance is parameterized with TC specific parameters
AIFS, CWmin, CWmax, Persistence factor (PF)

11. slide by Konidala M. Divyan [3]
Example
Network B
Home
network A
Foreign Agent
Internet
Home Agent
Network C
Mobile Node
Corresp.
Node C
slide by Konidala M. Divyan [3]

12. 31 - Outlines Introduction to WMN Characteristics WMN vs MANET
Backbone, dedicated routing, mobility, multiple radios
Architecture
Applications
Critical factors influencing performance
Radio techniques
Scalability
QoS
Security
Ease of Use
Mesh connectivity

13. 32 - Outlines MAC Layer Network Layer QoS Support at each layer
Scalability
Multi-Channel
Some Ideas
Research Issues
Network Layer
Routing
Wish List
Route Optimization Criteria
Routing fairness
Routing – Cross-layer design
QoS Support at each layer
WMN Standards

14. 33 - Outlines TCP Variants Issues in Heterogeneous Wireless Networks
Slow start
Fast Retransmit/Recovery (TCP Reno)
Issues in Heterogeneous Wireless Networks
TCP Schemes for Wireless
Pure Link-level Approaches
Soft-state Transport Layer Caching Approaches
Soft-state Cross Layer Signalling Approaches
Hard-state Transport Layer Approaches

15. 34 - Outline Introduction to WSN Applications of WSN
Factors Influencing Performance of WSN
Power consumption
Fault tolerance
Scalability
Topology
Architecture and Communication Protocols
Challenges in WSNs.

16. 35 - Outlines Attributes of MAC Protocol Energy Efficiency in MAC
Proposed Routing Protocol
S-MAC
T-MAC
DS-MAC
Traffic Adaptive MAC
DMAC
Contention-Free MAC

17. 36 - Outlines Routing Challenges and Design Issues Routing Protocols
Deployment
Routing method
Heterogeneity
Fault tolerance
Power
Mobility etc
Routing Protocols
SPIN
Directed Diffusion
ACQUIRE
LEACH
TEEN/APTEEN
GAF
GEAR
SPEED

18. 37 - Outlines Transport Protocols for WSN TCP/UDP for WSN Protocols
PSFQ
ESRT
CODA
Security Threats in WSN
TinySec
Motivations of Link Layer security
TinySec Design goals

19. 38 - Outlines Security primitives in TinySec Encryption Schemes
Keying mechanism
WMSN
Architecture
Applications
Advantages
Design Considerations
Protocols
WSAN
Motivation
WSN vs WSAN

20. 39 - Outlines Bluetooth introduction Technical features
Access technique
Bluetooth topology/scenario
Specifications
Core Protocols
Link connections

21. 40 - Outlines IP Over Bluetooth Bluetooth Security WPAN Standards
IEEE Overview
Topology
Coordination
Starting a Piconet
Handing over control of piconet
Creating child piconet
Medium Access (Super-frame)
Channel Time Management
Power management
MAC Frame format

22. 41 - Outlines IEEE 802.15.4 Basics, Type of Devices Phy Layer
Channel Access Mechanisms
Slotted/Unslotted CSMA/CA
Super-frame Structure

23. 42 - Outlines
WiMAX Basics
Evolution

24. 43 - Outlines
Reference Model
Burst profiles
Classes of Uplink service

25. 44 - Outline
4G Overview
Mobility Management
Handoffs