CJKTest-bed

CJKTest-bed

A test scenario of MPM based admission control device

on NGN CJK test-bed

15th NGN-WG 　 2009.4.8-10Test-bed Ad-hoc Group

Norihiro FUKUMOTO, Hideaki YAMADA KDDI (KDDI R&D Labs.)

no-fukumoto@kddi.comTEL: +81 49 278 7390, FAX: +81 49 278 7510

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Agenda

NGN CJK test-bed- Configuration of NGN CJK test-bed- Study phases

MPM based Admission Control Device- The purpose of Admission Control Device- Installation plan on NGN CJK test-bed- Burst Metrics- The behavior of Admission Control Device

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Configuration　of　CJK　test-bed　

Japan Core Network(TTC)

MPM (Router with mirror port and RTP translator)

Korea (TTA)

CPE (PC with RTP/RTCP client

software)CPE (RTP/RTCP client appliance)

MPM (Router with mirror port and RTP translator)

China (CCSA)

CPE (PC with RTP/RTCP

client software) CPE (RTP/RTCP client appliance)

MPM (Router with mirror port and RTP translator)

SIP Server SIP Server

CPE (PC with RTP/RTCP client

software)

CPE (RTP/RTCP client appliance)

SIP Server

RACF

RACF

RACF

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CJK NGN Test-bed

Phase I: 2006 3rd/4th Quarter (Completed)- Network Connectivity- Scenario 2 and 4 only (2 CS and 2 domains)

Phase II: 2007 1st/2nd Quarter (Completed)- Scenario 1, 3 (simpler version of 2 and 4, single domain) and 5

Phase IV: 2008 3rd ~ 2009 2nd Quarter- Performance Evaluation of RTP/RTCP-based MoIP and IPTV services- Performance Monitoring Scenarios 6-3 and 6-4- Initial RACF Interoperability testing : Scenario 7- Testing of RACF and RTP/RTCP-based MPM Interactions- IPTV Interoperability testing

Test Admission Control Device in parallel

Study　phases　(Study　scenarios)

Our Suggestion

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The　purpose　of　the　admission　control　device

For disaster recoveryA fire wall, which confines local congestion caused by disasters to local areas

An admission control scheme, which works independently and locally

For avoiding excessive traffic in test-bed Detect excessive traffic and suppress them automatically

In Practical NGN

In CJK NGN test-bed

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Admission　control　device

Admission control device is implemented- An implementation of MPM subset - It is in accordance with Y.2173- It works based on full passive measurement

MPM

PMR-FE

PME-FE

Mr

Mp

Mu

Other NGN Providers’

MPM

Mi

Admission Control

Function

Mu handler

Mi handler

Mr handler

Passive Measurement

Active Measurement

PMP-FEMeasurement

ProcessingNetwork-wide Measurement

Admission Control Device

Fig. Admission control device, a subset of MPM with an admission control function

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Installation　plan　of　Admission　Control　Device　on　CJK　NGN　test-bed

Japan Core Network(TTC)

MPM (Router with mirror port and RTP translator)

Korea (TTA)

CPE (PC with RTP/RTCP client

software)CPE (RTP/RTCP client appliance)

MPM (Router with mirror port and RTP translator)

China (CCSA)

CPE (PC with RTP/RTCP

client software) CPE (RTP/RTCP client appliance)

MPM (Router with mirror port and RTP translator)

SIP Server SIP Server

Japan Access Network (TTC)

Call generator

CPE (RTP/RTCP client appliance)

SIP Server Admission Control Device

RACF

RACF

RACF

Excessive calls

Additional calls in case of congestion will be rejected

automatically

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Burst　Metrics　which　represent　congestion　level

Gap period Gap period

Burst period

Lost packet

Arrived packet

Following four parameters represent congestion level- Gap Density : Packet loss ratio in Gap periods- Gap Duration : Mean duration of Gap periods- Burst Density : Packet loss ratio in Burst periods- Burst Duration : Mean duration of Burst periods

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Burst　Metrics　–　Four　State　Markov　Model

Fig. Four state Markov model

Defined in RFC 3611 (RTCP XR)- Separate the RTP packet stream RTP into two periods

Burst period: High proportion of packet loss Gap period: Low packet loss

2

C23

3

C22

1

C14

4

C31

Burst Gap

C32 C41C13

C33 C11

state 1: received a packet during a gapstate 2: received a packet during a burststate 3: lost a packet during a burststate 4: lost an isolated packet during a gap

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The　behavior　of　the　admission　control　device(Measurement　the　burst　metrics　of　each　segment)

Fig. Burst metrics measurement scheme of the admission control device

Client A Client BSBC

Segment A Segment B

I. RTP packets are sent and some of them has lost in the networks

lost in network A

lost in network B

II. Packet loss pattern of the whole network is feedbacked as Loss RLE Report Block in RTCP XR

III. Proper packet loss pattern in the segment B is calculated from the packet loss pattern of segment A and whole network

Burstiness of packet loss in each network segment will be calculated. The burstiness represents congestion level.

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The　behavior　of　the　admission　control　device(Admission　control)

The device modifies signaling packets to perform admission control based on the measured QoS of each network segment

CPE SIP ProxyAdmission Control Device

INVITE

480 Temporarily Unavailable

m=audio 50000 RTP/AVP 0 18a=rtpmap:0 PCMU/8000a=rtpmap:18 G729/8000m=video 51000 RTP/AVP 31a=rtpmap:31 H261/90000

m=audio 50000 RTP/AVP 18a=rtpmap:18 G729/8000

INVITE

m=audio 50000 RTP/AVP 0 18a=rtpmap:0 PCMU/8000a=rtpmap:18 G729/8000m=video 51000 RTP/AVP 31a=rtpmap:31 H261/90000

INVITE

Pass through

(A) Codec limitation(B) Admission control

Fig. The behavior of the admission control device

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Thank you for your kind attentions.

Q&A

This work is partly supported by the National institute of Information and Communications Technology (NICT).