Fiber-wireless access network

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Fiber-wireless access network

指導教授：吳和庭教授報告：江昀庭2012/10/31

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Outline Introduction Optical-Fiber Network

Passive Optical Network (PON) EPON

• Interleaved Polling with Adaptive Cycle Time (IPACT)• Dynamic Bandwidth Allocation (DBA)

Fiber-wireless access network(Fiwi) Radio over Fiber

Power saving on Fiwi Challenge

Conclusion

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Introduction

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Conclusion

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Passive Optical Network (PON)

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Passive Optical Network (PON)

Optical line terminal (OLT) Optical network units (ONUs) or Optical network terminals (ONTs) Use broadcast on Downstream Use TDMA on Upstream All ONUs register to OLT with LLID

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Conclusion

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EPON REPORT and GATE message REPORT

ONU to report its bandwidth requirements OLT passes REPORT to the DBA algorithm

GATE After executing DBA algorithm, OLT transmits

GATE down-stream to issue up to four transmission grants to ONU

Transmission start time Transmission length Timestamp (used by ONU for synchronization)

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Conclusion

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Interleaved Polling with Adaptive Cycle Time (IPACT)

OLT maintain a Table with Byte and RTT First grant, G(1), is set to some arbitrary value In polling cycle n, ONU measures its backlog in bytes

at end of current upstream data transmission & piggybacks the reported queue size, Q(n), at end of G(n)

Q(n) used by OLT to determine next grant G(n+1) => adaptive cycle time & dynamic bandwidth allocation

If Q(n)=0, OLT issues zero-byte grant to let ONU report its backlog for next grant

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Conclusion

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Dynamic Bandwidth Allocation Fixed service

OLT issues each ONU grant of size MTW => constant cycle time & static bandwidth allocation

Limited service OLT grants requested number of bytes, but no more than MTW

Credit service OLT grants requested number of bytes plus either constant

credit or credit proportional to request Elastic service

OLT grants an aggregate maximum of N MTWs to N ONUs, possibly allocating it to single backlogged ONU

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Conclusion

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Fiber-wireless access network(Fiwi)

Purpose to increase bandwidth for wireless users. Using Optical backbone and Wireless at

endpoint(terminal) i.e WIMAX, LTE, LTE-A Communication by radio signal. It will use wireless

protocol to transmit data.

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Conclusion

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Radio over Fiber In order to using wireless protocol, we need Radio

over Fiber(RoF) on network. It consist of Base station(BS) and Control station(CS) BS change signal from wireless to optical, vice versa. CS = modulation + demodulation + coding + routing

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Conclusion

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Power saving on Fiwi Minimize the number of active ONUs. As possible as using recently wireless link. Maximize the number of sleeping ONUs.

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Conclusion

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Challenge We need to consider the following points:

WOBAN topology can provide several redundant paths for a packet to reach its destination

Traffic load variation during different hours of the day. Thus, we can selectively put some nodes to a low-power (sleep) state during low-load hours, thereby reducing network power consumption

How to put an ONU to Sleep State Need Mathematical Model to handle the traffic flow

between a source–destination pair

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Conclusion

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Conclusion Fiwi provides high bandwidth network but there has

some problem to discuss How to design an architecture How to make balance between Fiber deployment

cost and power saving How to put an ONU to sleep (… DBA?) How to select the wireless protocol

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Reference[1] Burak Kantarci, Mazen Khair, Hussein T. Mouftah “Power Saving

Cluster for Energy-efficient,” IEEE 2010[2] Pulak Chowdhury, Student Member, IEEE, Massimo Tornatore,

Suman Sarkar, and Biswanath Mukherjee “Building a Green Wireless-Optical Broadband Access Network (WOBAN),” JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 28, NO. 16, AUGUST 15, 2010

[3] Klaus Petermann, Adam Wolisz and Ralf Lehnert “Radio over Fiber based Network Architecture,” Berlin 2005

[4] Glen Kramer and Biswanath Mukherjee “IPACT: A Dynamic Protocol for an Ethernet PON (EPON),” IEEE Communications Magazine, February 2002

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Thanks for your listening

To be continuous…

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AnySee AnySee 是華中科技大學自主設計研發的視頻直播系統 AnySee具有如下優點(1) 採用一對多的模式，提高了系統的可擴展性(2) 處理結點異構性。服務於不同操作系統、不同硬體性能、不同頻寬的結點(3) 利用 Landmark 路標算法實現近播思想，降低了系統負載和復雜度，提高了 QoS和系統的可用性(4) 解決了某些結點因為 NAT 或者防火牆而無法享受服務的問題，擴大了系統的可擴展性

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AnySee-系統架構 AnySee 系統由五個部分組成：a) Broadcasterb) Peerc) Encoder Serverd) YPS(Yellow Page Server)e) LS(Log Server)。

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AnySee-系統架構圖

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AnySee系統實現的三個關鍵技術應用層組播（ Application-Level

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Fiber-wireless access network

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