Fiber-wireless access network 指導教授：吳和庭教授報告：江昀庭 2012/10/31 1

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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-系統架構圖

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AnySee系統實現的三個關鍵技術

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Documents

Fiber-wireless access network 指導教授：吳和庭教授 報告：江昀庭 2012/10/31 1

Fiber-wireless access network 指導教授：吳和庭教授報告：江昀庭 2012/10/31 1