WiMAX

1. WiMAX By Omkar KiraniSridhara Chaitanya Sannapureddy Vivek Gupta

2. Overview • Introduction • Definition of WiMAX • Working of WiMAX • WiMAX Scenario • Technical Details • MAC Layer • Architecture • Features • Benefits • Limitations • Uses of WiMAX • Conclusion

3. Introduction • THINK ABOUT INTERNET • A worldwide, publicly accessible series of inter-connected computer networks. • Main uses • Transmit data • Communication • Web applications • Three ways to access Internet • Broadband – Uses DSL or cable modem • Dial up Connection – Uses modem • WiFi – Uses WiFi routers and hotspots

4. Introduction • THINK ABOUT WIRELESS ACCESS • Accessing networks without any wires. • Convenient and ease of access. • Ex: WiFi • Low data transfer • less coverage • New wireless technology should promise • High speed • Broad Coverage

5. Definition of WiMAX • WiMAX – Worldwide Interoperability for Microwave Access. • It is a new telecommunication technology aimed at providing wireless data over long distances. • This wireless technology is designed to provide the last mile of high speed internet access as well as nomadic service. • It is based on IEEE 802.16-WirelessMAN

6. WiMAX System consists of WiMAX TOWER WiMAX RECEIVER

7. Working of WiMAX

8. Scenario • Consider a scenario where a WiMAX-enabled computer is 10 miles away from the WiMAX base station. • A special encryption code is given to computer to gain access to base station • The base station would beam data from the Internet required for computer (at speeds potentially higher than today's cable modems)

9. Scenario • The user would pay the provider monthly fee for using the service. Lower cost + better speed. • The WiMAX protocol is designed to accommodate several different methods of data transmission, one of which is Voice Over Internet Protocol (VoIP) • Almost anyone with a laptop could make VoIP calls

10. Technical Details • WiMAX is a term coined to describe standard, interoperable implementations of IEEE 802.16 wireless networks. • Standards • Range- 30 miles from base station • Speed- 70 Megabits per second • Frequency bands- 2 to 11 GHz for licensed band and 10 to 66 GHz for unlicensed bands. • Defines both MAC and Physical (PHY) layer and allows multiple PHY layer specifications.

11. MAC layer/ data link layer • WiMAX uses a scheduling algorithm for which the subscriber station need to compete only once for initial entry into the network. • A time slot is allocated to the subscriber by the base station. • The time slot can change but remains assigned to the subscriber station • Stability is achieved by allowing the base stations to control QoS parameters by balancing the time-slot assignments wrt application needs.

12. Architecture • Fixed WiMAX has two types of architectures: • Point-to-Point (P2P) Architecture • Point-to-Multipoint (P2MP) Architecture.

13. Architecture Point-to-point

14. ArchitecturePoint-to-Multipoint

15. Features • Scalability • Quality of Service • Range • Coverage

16. Advantages • Speed • Wireless • Broad Coverage

17. Uses • Wi-Fi hotspots can be interconnected without any wires. • It provides a wireless alternative to cable and DSL connection for last mile broadband access • It can provide high-speed data and telecommunications services. • Providing nomadic connectivity.

18. Limitations • Error rate is increased when operated over maximum range and capacity. • Lower shared bandwidth in case of too many active users. • System up-gradation for current computers is required to receive WiMAX transmissions.

19. Future Development • Long term goal for WiMAX is to achieve 100 MBPS mobile and 1 GBPS fixed-nomadic bandwidth.

21. Conclusion Speed, broad coverage, mobility, portability are the major concerns for a wireless network. WiMAX has all these properties, hence it has the potential to substitute 3G and become a promising 4G.

22. References • http://en.wikipedia.org/wiki/WiMAX • students.csci.unt.edu/~srj0062/WIMAXf.ppt • http://standards.ieee.org/getieee802/802.16.html • http://www.palowireless.com/i802_16/tutorials.asp • http://www.wimax-industry.com/ar/12y.htm • http://www.apricot.net/apricot2005/slides/C5-1_3.pdf • http://www.wimax-industry.com/wimaxnews.htm • http://abhi.taralekar.googlepages.com/architecture • http://standards.ieee.org/getieee802/download/802.16e-2005.pdf • http://ezinearticles.com/?WiMAx-VS-Wifi&id=118819

23. Questions & Answers

24. 1. Do Service Providers need License to use Wi-MAX? Justify your answer? Yes / No

25. 2. Will WiMAX replace DSL and Cable? • The question of whether or not it could replace either DSL or Cable will vary from region to region. Many developing countries simply do not have the infrastructure to support either cable or DSL broadband technologies. In fact, many such countries are already widely using proprietary broadband wireless technologies. Even in such regions however, it is very unlikely that either Cable or DSL technologies would disappear. So it may be cheaper to deploy Cable and DSL in the cities, whereas WiMAX will dominate outside of major towns.

26. 2. Will WiMAX replace DSL and Cable? • In US, both Cable and DSL are growing extremely fast, but are not available for all customers. Rural and remote areas often lack broadband choices if any are available at all. When they are available, the DSL or cable plant may only exist within the town limits with no service outside the city limits. This offers a compelling argument that low-cost WiMAX gear can leverage access to many new customers. WiMAX also promises a whole new level of data access flexibility that will be much less location specific for customers.

27. 3. In WiMAX technology, is it realistic to provide a service affordable on price and competitive compared to others? What is the outlook for the future? • Same as discussed earlier…

28. 4. How different is Mobile Wi-MAX from a Fixed one? Are they compatible, if so How? • Fixed WiMAX deployments do not cater for handoff between Base Stations, therefore the service provider cannot offer mobility. • In contrast handoffs take place between base stations offering mobility in mobile WiMAX. • "Mobile WiMAX" implementations can be used to deliver both fixed and mobile services.

29. Thank You ! Questions ?