Dynamic control method of queuing delay with/without OEO conversion - - PowerPoint PPT Presentation
Dynamic control method of queuing delay with/without OEO conversion in a multi stage access network a multi-stage access network 2012 3 6 2012.3.6 Tatsuya Shimada Noriko Iiyama Hideaki Kimura Tatsuya Shimada, Noriko Iiyama, Hideaki Kimura
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The future access network must support various aspects of QoS such as pp p Q bandwidth and delay performance that each service requires. TMS (Tiny bandwidth Mass Service), BCS (Broadband Consumer Service). HBS (Huge bandwidth Service) HBS (Huge bandwidth Service)
Mass TMS
New service dom ains ( Categories)
Number of networked terminals
BCS
RFID tags sensors actuators etc. di iti ti f
HBS
Interactive video com m unication ( Categories)
Ti
terminals
H Small
digitization of various events in the real world. com m unication, circulation of CGM, cloud- com puting,CDN etc. Huge data center, high quality com m unication with realistic sensation etc.
Tiny Communication bandwidth Huge
Current netw ork services ( VoI P, W eb, P2 P etc.)
Fig 1 Classification of network services in the future
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（ Ref） http://www.itu.int/ITU-T/focusgroups/fn/output.html#2nd
Fig.1 Classification of network services in the future
ITU-T Y.3001 (2011/5) Future Networks : Objectives and Design Goals
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①The queuing buffer size must be designed according to peak rate.
O N U # 1 O L T P D # 1 B u f f e r # 1 W D M
O N R
n d R
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O N U # 1 O L T P D # 1 B u f f e r # 1 W D M
O N R
n d R
i n A g g r e g a t i
g g p
O N U # 2 A g g r e g a t i
P D # 2 B u f f e r # 2 L D
… …
O N U # 2 A g g r e g a t i
P D # 2 B u f f e r # 2 L D
… …
O N U # N P D # N B u f f e r # N
… …
O N U # N P D # N B u f f e r # N
… …
② The procedure of reading out upstream signals at the queuing buffer becomes Traffic fluctuation
Huge
g q g exceedingly complex to support QoS metrics like latency.
g Tiny
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Tiny Time
New access network with multi-access points and multi-service planes supporting quality (bandwidth, delay performance) of each service.
Service #N aggregation
…
drop Access Point#N (OLT#N) add Service #2 regenerate aggregation A P i t#2 regenerate drop add regenerate aggregation Access Point#2 (OLT#2) Service #1 Each user regenerate drop add Each user regenerate Access Point#1 (OLT#1)
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Merit: low delay performance, avoiding traffic congestion …
(OLT#1)
TMS BPS HBS (reference) Special Feature: “Towards Ultrahigh-speed High-capacity Networks”
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(reference) Special Feature: Towards Ultrahigh-speed High-capacity Networks NTT Technical Journal, vol.7, no.5, May 2009.
【 Upstream OLT】 Checking header information
Header
information
Matched signals Buffer PD Control Drop Buffer FDL Plane#N SOA ONU Access Point
Corresponds to time E h d
OFF ON OFF ON
Corresponds to time
Erase matched signals
If the signals match a service, the matched signals are sent to a drop buffer.
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The control part turns the SOA bias OFF and erases the matched signal.
【 Upstream OLT】 Checking header information
Header
information
Buffer PD Control Drop Buffer FDL Plane#N SOA ONU Access Point
Corresponds to time
OFF ON OFF ON
Corresponds to time
Regenerates NOT matched signals
ON
If the signals do not match a service, the unmatched signals are sent to the
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next access point. The control part turns the SOA bias ON for regeneration.
【 Downstream OLT】
A downstream OLT needs a function for added signals
C t l Add Buffer Header NOT added signals No modulation Buffer PD Control FDL No modulation SOA Access Point ONU MOD EDFA Point
Corresponds to time
Regenerates all signals
If no signals are present in the add buffer, all the signals are regenerated in
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the SOA.
Add Buffer
【 Downstream OLT】
Control Add Buffer Header added signals buffer signals Buffer PD FDL EDFA added signals buffer signals SOA Access Point ONU MOD
Erase signals with data Erase signals with data rewrite technique Modulate buffer signals and added signals
If signals are present in the add buffer, the downstream signals are erased by SOA optical saturation using a data rewrite technique. Then the buffer signals
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and added signals are modulated.
Erase signals with SOA
CW
SOA data rewriter for WDM-PON,” pp.399-408 IEICE TRANS COMMUN., vol.E91-B, No.2 Feb. 2008.
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The system cannot control the number of OEO conversions because the transmission of downstream signals with or without OEO conversions depends transmission of downstream signals with or without OEO conversions depends
fluctuation of this bandwidth. Therefore, the system cannot satisfy the delay performance requirements of each service performance requirements of each service.
Control Add Buffer
With OEO conversion
Buffer PD FDL EDFA SOA MOD EDFA
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Without OEO conversion
Token packet method
<Decision Criterion>
Checking part
frame length > the total number of token : without OEO conversion (O/O mode) frame length < the total number of token : with OEO conversion (O/E/O mode)
Controller Add Buffer Badd : bandwidth
g p Buffer PD T: cycle R: the number of tokens Token0: initial value Lopt : frame length Total number of tokens SOA FDL EDFA subtracted tokens
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SO Bopt : bandwidth of downstream signal
When the downstream signal d t llid ith dd d does not collides with added signal, the downstream signal can be transmitted in the O/O mode even if the total number of tokens is smaller than frame length. g
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If th t t l b f t k If the total number of tokens is larger than frame length of the just received downstream signal, the added signal waits even if it arrived before the downstream signal. At the same time, the downstream signal can be transmitted in O/O mode. O/O mode.
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<Simulation parameter> Transmission rate : 1 Gbit/s Optical packet bandwidth (Bopt) : 250Mbit/s, 500Mbit/s Added signal bandwidth (Badd) : 250Mbit/s, 500Mbit/s F l h L 64 1 18 b Frame length Lopt : 64-1518 bytes (Header length : 14 bytes , Data length : 46-1500bytes, frame check sequence : 4 bytes) M d l P i
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Model : Poisson process
【 Control#1】 Token criteria + status of collision
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【 Control#2】 Token criteria Bopt=500Mbit/s Badd=250,500Mbit/s Bopt=250Mbit/s Badd=250,500Mbit/s
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The system can also control the number of OEO conversions by adjusting The system can also control the number of OEO conversions by adjusting Token0 and R.
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