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Delay Bound Analysis for Hybrid Network: IEEE 802.11g ERP-OFDM WLAN over Fiber

Delay Bound Analysis for Hybrid Network: IEEE 802.11g ERP-OFDM WLAN over Fiber. Erna Sri Sugesti Purnomo Sidi Priambodo Kalamullah Ramli Bagio Budiardjo. Background. Most wide-world WLAN usage Need to carry large data rate/bandwidth

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Delay Bound Analysis for Hybrid Network: IEEE 802.11g ERP-OFDM WLAN over Fiber

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  1. Delay Bound Analysis for Hybrid Network: IEEE 802.11g ERP-OFDM WLAN over Fiber Erna Sri Sugesti PurnomoSidiPriambodoKalamullahRamli BagioBudiardjo

  2. Background • Most wide-world WLAN usage • Need to carry large data rate/bandwidth • Need to extend the coverage area within crowded Wi-Fi networks Webtorials, WLAN Deployment Trends, 2008, at www.webtorials.com

  3. Parameters of the IEEE 802.11g physical layer variants

  4. Medium access control(MAC)at a glance

  5. IEEE 802.11 Model Transport Layer Logical Link Control Network Layer Medium Access Control Data Link Control Layer PLCP sublayer Physical layer PMD sublayer

  6. BH Walke, S Mangold, L Berlemann, IEEE 802 Wireless Systems, John Wiley & Sons, UK 2006

  7. Basic Access RTS/CTS

  8. Link model of IEEE 802.11g WLAN over Fiber

  9. Protocol Model of IEEE 802.11gERP-OFDM WLAN over Fiber Radio Freq Domain 2,4 GHz Optical Freq Domain Medium Access Control Medium Access Control PLCP sub layer PLCP sub layer Optical fiber Free Space O/E PMD sub layer PMD sub layer OFDM+ 64_QAM 16-QAM QPSK BPSK

  10. Delay bound formulation TD = 2 (Topt + tf+ ) (1) where: TD= total propagation delay (s) Topt = optical transceiver delay (s) tf = optical fiber delay (s) where (2) • neff = effective refractive index of optical fiber core • Lf = the length of optical fiber used (m) • c = speed of light in vacuum, 3x108 m/s •  = air propagation delay (s)

  11. Evaluation of air propagation delay value for IEEE 802.11g

  12. Delay of 802.11g ERP-OFDM

  13. The delay bound of BAS & RTS/CTS

  14. The upper limit propagation delays using a PHY-RX-START-Delay (TPRSD) for long PPDU

  15. IEEE802.11g ERP-OFDM parameter

  16. The maximum fiber length with different air propagation delay 3.78 km 3.96 km

  17. The delay bound with basic access method, Airprop-1= 1 s, Airprop-2= 0.1 s

  18. The delay bound with RTS/CTS method, Airprop-1= 1 s, Airprop-2= 0.1 s

  19. Delay bound at optical fiber maximum length

  20. Conclusion • The delay bound can be predicted by using the maximum distance of fiber and depend on the access method used. • The time out of ACK and CTS determine the maximum distance of optical fiber

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