Fiber-wireless access network

qualtaghblurtingMobile - Wireless

Dec 12, 2013 (3 years and 6 months ago)

85 views

Fiber
-
wireless
access network

指導教授:吳和庭教授

報告:江昀庭

2012/10/31




1

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


2

Introduction

3

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


4

Passive Optical Network (PON)

5

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


6

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



7

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)



8

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



9

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

10

11

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

12

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


13

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


14

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.


15

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

16

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


17

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

18

Power saving on
Fiwi


Minimize the number of active ONUs.


As possible as using recently wireless link.


Maximize the number of sleeping ONUs.


19

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

20

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

21

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

22

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


23

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


24

Thanks for your listening

To be continuous…

25

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

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

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

26

AnySee
-
系統架構


AnySee

系統
由五個部分組成


a)
Broadcaster

b)
Peer

c)
Encoder Server

d)
YPS(Yellow Page

Server)

e)
LS(Log
Server)


27

AnySee
-
系統
架構圖

28

AnySee
系統實現的三個關鍵技術


應用層組播(
Application
-
Level Multicast

ALM



Landmark
路標算



數據緩衝區管理機制

29