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乙太被動式光纖網路之三模式節能機制 設計 ( The design of three mode based power saving mechanisms in EPON)

Speaker: Shieh-Chieh Chien Advisor: Dr. Ho-Ting Wu 2014/05/26. 乙太被動式光纖網路之三模式節能機制 設計 ( The design of three mode based power saving mechanisms in EPON). Outline. PON EPON TDM & TDMA MPCP IPACT IPACT with downstream IPACT downstream collision Power saving design Active to doze

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乙太被動式光纖網路之三模式節能機制 設計 ( The design of three mode based power saving mechanisms in EPON)

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  1. Speaker: Shieh-ChiehChien Advisor: Dr. Ho-Ting Wu 2014/05/26 乙太被動式光纖網路之三模式節能機制設計(The design of three mode based power saving mechanisms in EPON)

  2. Outline • PON • EPON • TDM & TDMA • MPCP • IPACT • IPACT with downstream • IPACT downstream collision • Power saving design • Active to doze • Active to sleep • Two service level • Early wake up • Mode transition • Our proposal • Parameter • Sleep time setting • How long can ONU keep in power saving mode? • Reference

  3. PON • Passive Optical Network (PON)： • APONis composed of one OLT and multiple ONUs or ONTs. • Optical Line Terminal(OLT)： • The OLTresides in the local exchange (central office; CO) • Optical Network Unit(ONU)： • The ONU is located at user premises (FTTC, FTTH,FTTB..) • Data Link：SONET、ATM、Ethernet • Media-access：WDM、TDM、CDM

  4. Access network topologies [1]

  5. Passive Optical Network (PON)

  6. EPON • Ethernet Passive Optical Network (EPON) • A PON that carries Ethernet traffic • OLT downstream direction (OLT -> ONUs)： • TDM • Point-to-multipoint • Ethernet is broadcasting by nature • ONU extract downstream packets based on MAC address • ONUs upstream direction (ONUs -> OLT)： • TDMA • Multipoint-to-point • Use separate TDM channel

  7. TDM & TDMA [7]

  8. Multipoint control protocol(MPCP) • The MPCP is only a message-exchange protocol • Five MAC Control messages： • REGISTER_REQ、REGISTER、REGISTER_ACK • Used for ONU auto-discovery, registration and ranging • GATE、REPORT • Used for assigning and requesting bandwidth

  9. GATE & REPORT format [7]

  10. Interleaved Polling with Adaptive CycleTime (IPACT[2])

  11. IPACT(Cont.)

  12. IPACT(Cont.)

  13. IPACT(Cont.)

  14. IPACTwith downstream

  15. IPACTdownstream collision(Cont.)

  16. IPACTdownstream collision(Cont.)

  17. IPACTdownstream collision(Cont.)

  18. Power saving mode • Active mode (TRx-on) • SIEPON (IEEE P1904.1) [2] • Tx sleep mode • TRx sleep mode • ITU-T G-series Recommendations – Supplement 45 [3] • Doze ( Tx-off, Rx-on) • Sleep(TRx-off)

  19. [4]

  20. Active to doze

  21. Active to sleep

  22. Two service level • The priority value is using 3-bit field stored in Ethernet frame header defined by IEEE P802.1p • High priorityfor delay sensitive and bandwidth guarantee traffic • Ex: network control , video traffic • Low priority is typically best-effort traffic

  23. Early wake up • While in power saving mode ONU can do early wake up to transmit high priority data. • Sleep to Active aggressive 2ms (0.125~5.125 ms)[5] • Doze to Active (0.125 ms)[5]

  24. Mode transition

  25. Our proposal

  26. Our proposal(Cont.)

  27. Our proposal(Cont.)

  28. Parameters • 16 ONUs • Cycle time 2 ms • Guard time = 5 μs • MTW = 15000 Bytes • (2ms - 16* Guard time )/16 ONUs/8bit *109 • IPACT limited service • Optical distribution network(ODN) = 10 Km • Packet size = 64~1518 Bytes • Timer Y=20ms • Tolerate = low priority delay bound • ONU, OLT Queue size = 8 Mbytes • 1 Gbps/ 16 = 62.5Mbps • 62.5Mb/8 = 7.8125 Mbytes( low priority won’t drop )

  29. Sleep time setting (Y timer) [6]

  30. How long can ONU keep in power saving mode? • To keep a watchdog timer in the OLT from expiring and deregistering the ONU, ONUs should sent MPCP REPORT message to the OLT periodically. (IEEE802.3ah and IEEE 802.3av) • The maximum duration of the sleep period shall be selected to be less than one second to be avoid automatic deregistration for the ONU under the operation of MPCP timeout mechanism. (IEEE Std 1904.1)

  31. Reference • [1] G. Kramer, B. Mukherjee, and G. Pesavento, “ Ethernet PON(Epon): Design and Analysis of an Optical Access Network, ” pp. 1-25, Aug 2000. • [2]G. Kramer, B. Mukherjee, and G. Pesavento, “ IPACT: A Dynamic Protocol for an Ethernet PON (EPON), ”IEEE Commun. Mag., vol. 40, no. 2, pp. 66-73, Feb. 2002. • [3] IEEE Std 1904.1:“ IEEE Standard forService Interoperability in EthernetPassive Optical Networks (SIEPON), ”2013. • [4] ITU-T, “G.Sup 45 : GPON power conservation,”2009. • [5]Ahmad R.Dhaini,“Toward Green Next-Generation Passive Optical Networks,”IEEE Commun. Mag., pp.94-101, Nov. 2011. • [6] J. Mandin, “ EPON Powersaving via Sleep Mode,” IEEE 802.3av Meeting, 2008. • [7] G. Kramer, “ On Configuring Logical Links in EPON,”Teknovus, Inc. pp. 1-12.

  32. Q&A • Thanks for your attention.

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