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Next Generation Residential IP Services
Next Generation Residential IP Services
December 02, 2003 | By Netmanias (tech@netmanias.com)
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8

 

2003년 12월에 ETRI에서 발표한 자료입니다.
【 Contents 】
Broadband Access Network 
    - Current: Broadband but Best-Effort Service ⇒ Flat Rate (IP Access)  
    - Near-Future: Broadband and Premium Service ⇒ New Paradigm (Contents and Service)
Killer Applications for Next Generation IP Networks 
    - Contents Delivery Services: VOD and Broadcast TV over IP 
    - Conversational Services: Video Phone, Multi-media over IP, Video-conferencing
Key Factors for Next Generation IP Services 
    - Access Bandwidth: ADSL, VDSL, FTTH, PON,… 
    - Service Creation Mechanism 
    - IP QoS

 

손장우 @ Netmanias (tech@netmanias.com)

Thank you for visiting Netmanias! Please leave your comment if you have a question or suggestion.
Transcript
Next Generation Residential IP Services
-Premium IP Services -

2003. 12. 2
JangwooSon (Netmanias)
son@netmanias.com
www.netmanias.com/ 02-556-9273/016-460-5747


Contents


Where is the Money ?



Telco’s Broadband Access Network

초기의초고속인터넷액세스서비스

Residential



Telco’s Broadband Access Network

Metro Ethernet의도입



Telco’s Stress


Telco (KT, NTT, SBC, Verison, BT, FT, ¡|)

IP Premium Services

How?
Application QoSrequirement
Network QoSRequirement
Network Dimensioning via Application
Service Authentication/Accounting
QoSguarantee
Admission control/Resource Management
QoSProvisioning/QoSEnforcement
QoS/SLA measurement


Triple play Service


VoD
Streaming
server

[1] VoDServices



User Request a VoDMovie




User Request a VoDMovie

Downstream ACL



QoSRequirement: DiffServ(Data Plane)



QoSguarantee: Data Plane (DiffServ)



QoSguarantee: Data Plane (DiffServ)



QoSRequirement: Bandwidth Broker (Control Plane)



Admission Control

인증/과금서버



Admission Control

QoSManager



VoDServer에서Control: Limitations

Congestion !!

BB의도입효과



[2] Video-Phone Service

Upstream QoS

Downstream QoS




Upstream QoSConcern


Upstream QoS(1)

TCP Flow 1-5

TCP Flow 5





Upstream QoS(2)

UDP Flow

TCP Flow 1-5






Video-Phone Service

(1) Packet Edge

(2) Legacy Edge



(1) Packet Edge

(1) Packet Edge



Worst case delay of EF flow with Peak Rate shaping at ingress

12msec

Worst case delay of a packet of a flow belonging to EF Class
< S/R = 1500Bytes/1Mbps = 12msec




Worst case delay of EF flow with Peak Rate shaping at ingress

Video-Phone Service를EF class로처리하고EF Class queue를non-EF Class에비해Static Priority를주는경우, Video-Phone flow가겪는최대지연시간(Worst case delay)는얼마인가?

두가지가정:


(1) EF Class의Application flows는DiffServ망의Ingress Edge에서Peak Rate으로Shaping한다. (CBR source이면상관없고, VBR source이면Equivalent capacity로shaping한다.)
(2) DiffServ망의모든Output link에서, 인가되는EF flows의rate의합보다많은BW가보장된다. 예를들어, 한라우터에EF class flows의rate의합이15Mbps인데EF class가쓸쓸수있는(즉최대로는Physical port BW) BW가10Mbps이면안되고15Mbps 이상이어야한다. 이는BB의도입으로각각의EF flows에대해Admission control을수행해주면보장된다.
위의두가지조건을만족하면한EF flow의DiffServ망에서의Worst case delay는S/R이내로한정된다. 여기서S: Packet size, R: Flows rate (shaped).

그이유는EF flow에속한packet이라우터에도착했을때겪어야하는Delay 요소는i) EF class에속한다른flows의Backlog가있는경우ii) 자기자신의Flows에속한Packet이아직도서비스받지못하고대기하고있는경우iii) Non-EF flow에속한Packet이서비스중일때도착한경우이다.

i)로인해발생하는최대Delay는S/R이며ii)의경우는위의두가지조건이만족되는상황에서는발생하지않는다(앞의그림참조). iii)은발생가능하나Non-EF class flow의Packet size가1500Byte라고하면1Gbps의link에서Serialization delay가12usec이므로과거의저속환경에서와는달리EF flows의품질에영향을주지못한다.

Worst case delay를S/R이하로줄이기위해서는Admission control을통해EF Class의부하량을줄이는것이하나의방법이다. 예를들어앞의그림의예에서EF Class의부하량을25%(SER의Uplink가1Gbps일때Video-Phone Service의최대사용BW를250Mbps로제한)로제한하면Worst case delay를3msec로한정시킬수있다.




Worst case delay of EF flow with Peak Rate shaping at ingress

Flow rate (R)
Packet size (S)
S/R
50% EF
30% EF

384 Kbps
500Byte
10.42msec
5.21msec
3.126msec

1500Byte
31.25msec
15.625 msec
9.375msec

1Mbps
500Byte
4 msec
2msec
1.2 msec

1500Byte
12 msec
6msec
3.6 msec



(2-1) Legacy Edge: Flow Routing

기존의Access Network (ADSLL, VDSLL, Metro Ethernet)을그대로유지하면서QoS를제공할수있는방안을제시

Vendor

Caspian Networks



IP Application



(2-1) Legacy Edge: Flow Routing



Flow Routing Test (1)


Shaping rate of TCP flow {1~5} = 0.343M
0.343M = [4Mbps *{6/(6+8)} ]/5
0.457M = [4Mbps *{8/(6+8)}]/5

Flow Routing Test (2)

TCP Flow 5

TCP Flow 1-5





Flow Routing Test (3)

UDP Flow

TCP Flow 1-5






Flow Routing Test (4)





(2-2) Legacy Edge: NG BRAS

기존의ADSL Access Network를그대로유지하면서Premium Service를제공할수있는방법론을제시

DSLL Forum: TR-59

Vendors

Juniper

Redback

Net.com

Alcatel




Problem Description

PC

TV



(2-2) Legacy Edge: NG BRAS

IP/VC/VP의Hierarchical Queueingand Scheduling을통해ATM Access Network에서QueueingPoint를없앰.



Case Study 1: DSL Forum



Case Study 2: MSF Forum

MSF Technical Report MSF-TR-QoS-001-FINAL


Case Study 3: Alcatel





Case Study 4: Juniper/Redback



5. Harmonics Project



Summary

Future Direction = Premium IP Service

Access Network 구조와Segment에따라다양한방식이제시
Trend ⇒Control Plane (Service Authentication, Admission Control)
+ Data Plane (QoS: DiffServ,…)
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