2. Motivation Analysis Definitions Decision Function Simulation Projects' Day 2008 WiMAX & WiFi Network Combination Ben Gurion University Department of Communication Systems Engineering 2008 Students : Ophir Artzi Pamela Oren Advisors: Prof. Michael Segal Mr. Amit Dvir

3. Motivation ANY Project in the Wireless Field. Great Customer Demand. Momentum of the Wireless Market. THIS Project. The WWAN REVOLUTION! Anytime, Anywhere! The Call for Optimization – Best Utilization. Motivation

4. WiMAX World Interoperability for Microwave Access IEEE 802.16 Metropolitan Area Network (MAN) 1.5 km in Urban Area Supports Handoff - Mobility Managed Definitions

5. WiFi “Wireless Fidelity” Local Area Network (LAN) IEEE 802.11 ~100 m coverage area Does Not Support Handoff - No Mobility Not Managed Definitions

6. Why Combine? Variety of Network Technologies Neither Technology Makes Possible The Best Available Network at All Times WiMAX – Metropolitan Area Netwoks (MAN) WiFi – Local Area Network (LAN). In Areas That WiFi Has Already Proven Itself as a Good Solution WiMAX May Not Be Able to Compete. Low - Priced High Rates Reliability COEXISTING STANDARD-BASED TECHNOLOGIES ARE THE RIGHT STRATEGY! Definitions

7. Vertical Handover Inter – System Handoff (as opposed to Intra – System) – Handoff among heterogeneous Wireless Access Technologies. Definitions Horizontal Handoff Horizontal Handoff Vertical Handoff Vertical Handoff

8. Vertical Handover Decision Function Definitions

9. Decision Function Time In WiFi Conversation Time – Tconv Remaining Time in WiFi Zone – Twifi Twifi< T conv Battery Energy Connecting to WiMAX – En(BS) Battery < En(BS) WiMAX Resources Free Slots From BS Free Slots < Req. Slots + ∆ Slots Signal Strength WiMAX Signal Strength – SS(BS) WiFi Signal Strength – SS(AP) SS(BS) > SS(AP) Decision Function

10. Simulation Combined WiFi & WiMAX Device 16 km 2 Area 4 Fixed Base Stations (802.16) 24 Fixed Access Points (802.11) Three Service Types – Data, Video and Voice.

11. Simulation 300 Hosts Two Host Types: Mobility – ‘Random Waypoint’ 2/3 Pedestrian (0-3 km/h). 1/3 Cars (50-80 km/h). Randomize: New Position speed Randomize: New Position speed Randomize: Wait Time Randomize: Wait Time Randomize: New Position speed Randomize: New Position speed

12. Simulation Lets get to the point…

13. Analysis 6 Simulation Types: 1.WiMAX only. 2.WiMAX + WiFi  No DF (If WiFi exists connect to it) 3.WiMAX + WiFi  DF #1 (Signal Strength) 4.WiMAX + WiFi  DF #2 (Number of Slots) 5.WiMAX + WiFi  DF #3 (Battery) 6.WiMAX + WiFi  DF #4 (Time in WiFi Zone) 10 runs per type (different seeds).

14. Results Analysis

15. Conclusions Analysis The results of using the decision function show that connecting to the 802.11 will not necessarily yield improvement. The more parameters we consider - the better network resources utilization we get. Combining wifi improves network performances greatly.

16. Future Work Analysis WiMAX Scheduler. WiMAX Cells Handoff. Mobilizing the Access Points.

17. Questions