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A Survey on Mobile WiMAX

A Survey on Mobile WiMAX. Bo Li, Hong Kong University of Science and Technology Yang Qin and Chor Ping Low, Nanyang Technological University Choon Lim Gwee, Republic Polytechnic Speaker : Yu-Ping Chen Adviser : Quincy Wu Date : Nov.1. Outline. Introduction Mobile WiMAX

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A Survey on Mobile WiMAX

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  1. A Survey on Mobile WiMAX Bo Li, Hong Kong University of Science and Technology Yang Qin and Chor Ping Low, Nanyang Technological University Choon Lim Gwee, Republic Polytechnic Speaker : Yu-Ping Chen Adviser : Quincy Wu Date : Nov.1

  2. Outline • Introduction • Mobile WiMAX • INTEROPERABILITY OF IEEE 802.16 AND IEEE 802.11 • Conclusion • Reference

  3. Introduction • IEEE 802.16 - Worldwide Interoperability for Microwave Access (WiMAX) • IEEE 802.16, a solution to broadband wireless access (BWA) BWA include the medium access control (MAC) and physical (PHY) layers

  4. the PHY layer includes orthogonal frequency- division multiplexing (OFDM) OFDM is achieved by providing multiplexing on users’ data streams on both uplink and downlink transmissions.

  5. IEEE 802.16 published in 2001. • Thefrequency range of 10–66GHz • maximum bandwidth of 120 Mb/s • maximum transmission range of 50km. • Initial, only supports line-of-sight (LOS) transmission and thus doesnot seem to favor deployment in urban areas.

  6. IEEE802.16a-2003 supports NLOS and OFDM at PHY layers. But it covers too many profiles and PHY layers, which can lead to potential interoperability problems.

  7. IEEE802.16-2004 provides technical specifications for the PHY and MAC layers for fixed wireless access and addresses the first or last-mile connection in wireless metropolitan area networks (WMANs). But it seems to IEEE 802.11 WLAN

  8. Mobile WiMAX • IEEE 802.16e released in 2007 AD has added mobility support. • This is generally referred to as mobile WiMAX.

  9. Mobile WiMAX adds significant enhancements: • It improves NLOS coverage by utilizing advanced antenna diversity schemes and hybrid automatic repeat request (hARQ). • It adopts dense subchannelization, thus increasing system gain and improving indoor penetration.

  10. Mobile WiMAX adds significant enhancements: • It uses adaptive antenna system (AAS) and multiple input multiple output (MIMO) technologies to improve coverage. • It introduces a downlink subchannelization scheme, enabling better coverage and capacity trade-off.

  11. There are several key features supported by mobile WiMAX QoS • end-to-end IP-based service mapping and also provides mechanisms for optimal scheduling on a frame-by-frame basis. Flexible spectrum allocation • different channelization from 1.25 to 20 MHz comply with diverse requirement in different countries

  12. There are several key features supported by mobile WiMAX • Enhanced security in that new authentication was added (3DES or AES加密，加上EAP) **Wi-Fi WPA2標準的PEAP認證與AES加密** The MIMO antenna techniques • support peak rates of 63 Mb/s in downlink and 28 Mb/s uplink per sector

  13. Two modes of power efficient operation • Sleep mode It minimize a mobile user’s power consumption and flexibility that allows a mobile user to scan BSs to collect handoff related information.

  14. Two modes of power efficient operation • Idle mode A mobile user can traverse multiple BSs and periodically capture downlink broadcast messages without registration to any specific BS.

  15. Mobile WiMAX provides three handoffmechanisms • Hard Handoff (HHO) HHO is mandatory, while FBSS and MDHO are optional. • Fast Base Station Switching (FBSS) FBSS a mobile user only communicates with the anchor BS, and the handoff involves the transition to a new anchor BS.

  16. Mobile WiMAX provides three handoffmechanisms • Macrodiversity Handover(MDHO) MDHO a mobile user communicates with all BSs in the active set, and different operations are defined for uplink and downlink transmission during handoff.

  17. Multicast and broadcast services (MBS) are supported in Mobile WiMAX. • High data rate and coverage using a singlefrequency network • Flexible radio resource allocation • Low power consumption • Supporting data, audio, and video multicast • Low channel switch time

  18. 802.16 Standard contrast

  19. INTEROPERABILITY OF IEEE 802.16 AND IEEE 802.11 For example • UGS QoS parameters in IEEE 802.16 be mapped to the Access Category 3 EDCA queue in IEEE 802.11e to provide sufficient QoS? • Rerouting packets from the WiMAX BS to the 802.11e AP. the packet reroute time is sufficiently short to handle any QoS transmission latency caused by the handover?

  20. INTEROPERABILITY OF IEEE 802.16 AND IEEE 802.11

  21. WiMAXv.s Wi-Fi

  22. Conclusion • It can be expected that future work will focus on the mobility aspect and interoperability of mobile WiMAX with other wireless technologies. • The cost of infrastructure and competition from other technologies such as 3G/4G.

  23. Reference • A Survey on Mobile WiMAX • Authors Bo Li, Hong Kong University of Science an Technology Yang Qin and Chor Ping Low, Nanyang Technological University Choon Lim Gwee, Republic Polytechnic

  24. Thank you for Listening

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