1. An Architecture for Wireless LAN/WAN Integration
IDS LAB
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2. Contents Introduction The Full Stack Adaptation Project
Integrating Mobile-IP with Multi-cell Wireless LANs
Background on Mobile IP
Mobile-IP based Wireless LAN
Experimental Analysis
The Testbed
Handoff coercion and propagation
Experimental Results
Conclusion

3. Introduction Two new paradigms of recent advances Nomadic computing
Using IEEE
Low mobility (up to 5M/h)
High bit rate (2 to 25 Mbps)
Mobile computing
GSM, CDPD, iDen
High mobility (up to 60 M/h)
Low bit rate (9.6 Kbps to 40 Kbps)

4. Introduction
What is needed for truly ubiquitous connectivity is “Adaptability Infrastructure”
So bridging wireless WAN and wireless LAN will fuse in the economical advantages and the high bit rate of wireless LAN with ubiquity and ad-hoc mobility allowed by wireless WAN.

5. Introduction To realize this vision Full Stack Adaptation
Integrating Mobile IP into the FSA architecture
Superimpose Mobile IP on Wireless LANs
Subnet Architecture
Using the Mobile IP protocol

6. The FSA Project
No single wireless network technology meets the ideal of high bandwidth, low latency, universal availability, and low cost
Full Stack Adaptation
the architecture that integrates horizontal and vertical handoff, while allowing applications to participate fully in the handoff process

7. The FSA Project The FSA architecture allows
A two-way interplay between applications and network connectivity on vertical handoffs.
Applications to provide recommendations to the handoff mechanism that can result in substantial savings.

8. The FSA Project Using Mobile-IP protocol
To integrate vertical and horizontal handoff
To provide a fixed IP solution under multiple networks
Enable handoff across
Cells in same /
different network

9. The FSA Project Role of each layer Vertical LAN/WAN handoff Layer
Monitor network characteristics
Power… etc
Application Adaptation Layer
Decide vertical handoff
Thin Client
The use of thin clients as an alternative to specialized proxies

10. Integrating Mobile-IP with Multi-cell Wireless LANs
Background on Mobile IP

11. Integrating Mobile-IP with Multi-cell Wireless LANs
Mobile-IP based Wireless LAN
Simplest solution is to impose a one-to-one mapping between wireless cells and sub-networks. It calls Subnet Architecture, SA
It requires
The detection of the MAC-level handoff occurrence on the mobile node
Subsequently initiating a Mobile IP handoff between the two networks

12. Integrating Mobile-IP with Multi-cell Wireless LANs
Mobile-IP based Wireless LAN
Generalization of SA is a many-to-one mapping of cells to subnets
Case of intra-subnet mobility
Only MAC-level handoff
Case of inter-subnet mobility
MAC-level and Mobile IP level handoff
It allows for higher flexibility in the design of the subnet based on administrative or work affinity instead of spatial affinity

13. Integrating Mobile-IP with Multi-cell Wireless LANs

14. Experimental Analysis
Testbed
Mobile Node can hear
from both of APs

15. Experimental Analysis
Handoff Coercion and Propagation
In the one-to-one mapping SA, the handoff at the MAC layer means that the Mobile IP handoff should be performed immediately.
Using handoff controller, we make the handoff by software.

16. Experimental Results
To quantify the overhead of the composite MAC/Mobile-IP handoffs and to compare it with MAC-only handoff
To determine the range of acceptable handoff frequencies, within which degradation of TCP performance is acceptable

17. Experimental Results
IEEE Handoff only

18. Experimental Results Composite IEEE 802.11 and Mobile IP Handoff
By Mobile IP Handoff

19. Experimental Results
TCP Performance Evaluation

20. Conclusion
We present
An architecture that aims at integrating wireless LANs and wireless WANs
The role of the Mobile-IP as an integrative layer
A simple subnet architecture that allows us to superimpose Mobile-IP on wireless LANs
Under practical values of handoff frequencies, the performance of Mobile IP based W-LAN handoff is almost identical to the performance of W-LAN handoff