2001-01-26 lucent technologies - proprietary slide 1 untersuchung adaptiver multimedia-anwendungen...

2001-01-26 Lucent Technologies - Proprietary slide 1

Untersuchung Adaptiver Multimedia-Anwendungen

über UMTS

Michael Link, Stefan Gruhl, Markus Bauer, Michael Söllner

Global Wireless Systems ResearchBell Labs, Nürnberg

[email protected]

ITG Workshop “IP in Telekommunikationsnetzen”26.01.2001

Michael Link - ITG Workshop “IP in Telekommunikationsnetzen” - 26.01.2001 slide 2

3G Wireless Multimedia

MultimediaApplication

Servers

3G Wireless Network IP

Unified Messaging

VideoStreaming

ContentAccess

M-Commerce

MultimediaApplication

Clients

Personal Information

Management

UMTSRadio LinkEmulator

IP

IP


Outline

UMTS QoS Framework

UMTS Demonstrator– Objectives and Concepts– Architecture– QoS Flows Concept– Radio Link Emulation– Configuration & Monitoring Tool

Application Example


UMTS QoS Framework

Middleware

UMTS

Application

TE MT UTRANService Provider Network /

InternetCN

GatewayCN

EDGE

Radio Bearer Service

Iu Bearer Service

UMTS Bearer Service: UMTS QoS

BackboneBearer Service

Radio Access Bearer ServiceCN

Bearer Service

TE/MT Local Bearer Service

External Bearer Service

API

UMTS

ServerClient

End-to-End Bearer Service

GPRS Hiperlan ….UMTS

End-to-End Application: QoS requirements & adaptation


UMTS Demonstrator - Objectives

Joint evaluation and optimization of UMTS packet data services and multimedia applications

Real-time UMTS radio link emulation is required for the evaluation of– interactive applications,– control loop performance of adaptive applications.

Support of standard applications:– IP interface– QoS support for QoS-unaware IP applications


UMTS Demonstrator - Concepts

Real-time UMTS radio link emulation running on Linux PC, multimedia applications on Laptops, all connected by LAN

Layer 1/2 UMTS radio protocol stack emulation for user plane data traffic, including:– RLC segmentation & ARQ– MAC scheduling– PHY bit-error injection

QoS flow concept: individual QoS setting for each TCP or UDP data flow

ApplicationServer

“UMTS Proxy”ApplicationClient

LANWLAN


UMTS Demonstrator - Architecture

LAN LAN

IP Address Translation & Checksum

IP Dispatcher

Configuration &Monitoring Tool

Multimedia Data, Control & Signaling

Application Client Application ServerUMTS Proxy Configurator

IP Kernel Module

UMTS Radio Link Emulation

UMTS Module

UDP TCP

IP

Multimedia Data, Control & Signaling

UMTS Proxy

UDP TCP

IP


QoS Flows Concept

Problem: current applications do not support QoS procedures.

Each TCP or UDP connection is treated as an individual flow:

Flows are distinguished by source/destination IP address and port numbers.

To each flow, an individual service is assigned:– A service is defined by UMTS Traffic Class and maximum bit-rate.

– Services are mapped to UMTS radio link protocol parameters.

Example: differentiation between TCP call setup and UDP data streaming


Emulated UMTS Services

Traffic Class Con-versational

Streaming Interactive or Background

FERB (at codeword level) 1 1 1

Target delay [ms] TBD TBD TBD

RLC mode TM TM AM

RLC payload size [bits] 640 576 320 320 640

RLC header size [bits] 0 0 16

TB size [bits] 640 576 320 336 656

CRC size [bits] 16 16 16

Coding scheme TC TC TC

TTI [ms] 20 40 40 20 20 20 10 10

Maximum bit-rate [kbps] 32 64 28.8 64 128 384 8 32 64 128 384 2048

Number of TF per TFS 2 2 3 5 6 8 2 3 4 5 6 7

TFS:Number of TBs per TBS

0, 1 0, 2 0, 1,2

0, 1,2, 4,

8

0, 1,2, 4,8, 16

0, 1, 2,4, 8,

16, 32,48

0, 1 0, 1,2

0, 1,2, 4

0, 1,2, 4,

8

0, 1,2, 4,8,12

0, 1,2, 4,

8, 16,32

Mapping of UMTS Traffic Class and bit-rate to radio protocol parameters:


UMTS Radio Link Emulation

Database:

Service parameters

Frame errormodel

parameters

Error gapdistributions

UMTS Layers:

RLC

MAC

PHY

retransmissionrequests

frame

CRCflags

IP packet from IP translation to IP

Flow identification

IP queues

RLCsegmentation

on demand

RLC error control &

re-assembly

PHY frame error model & bit error injection

MAC scheduling


PHY Emulation

Frame Error Model

Bit Error Model

if frame error

Bit error pattern

Error Model Database

Scenarios Events

Parameters

Real-time emulation required

Nested model for the output of the channel decoder

Error model parameters:– derived from link-level simulations – database for various scenarios


Configuration & Monitoring Tool


Example - Video Streaming

IP-based streaming & videophone applications:

Some but limited delay

UDP transport packet loss

Application specific control loops:– error control by buffering, retransmission,

and slow bitrate adaptation – designed for Internet congestion– inefficient for wireless link

Standards & implementations:– RTP/RTCP, RTSP– Real Video Streaming– Windows Media Streaming – MS NetMeeting (H.323)


Example Session - Parameters

Applications

Windows Media Streaming:– multiple bitrate stream:

26/40/60/80/120/200/300 kbps(audio: 8 kbps)

– buffer: 3 seconds

Real Video Streaming:– multiple bitrate stream:

20/34/45/80/150/225/350/450 kbps(audio: 5-32 kbps)

– buffer: 3 seconds

UMTS Proxy

Frame error model: PB = 0.01, LB = 2,

Service: Streaming 128 kbps, RLC ARQ offStreaming 128 kbps, RLC ARQ onStreaming 64 kbps, RLC ARQ on

buffer: 3 seconds (48 kB / 24 kB)


Example Session - Traces

Windows Media Streaming Real Video Streaming


Conclusion

The UMTS Demonstrator is an integrated, real-time

UMTS radio link emulator + application monitoring tool.

ApplicationServer

IP

ApplicationClient

UMTSRadio LinkEmulator

IP

Configuration&

Monitoring Tool


Backup Slides

Ongoing Work

Protocol Context

IP Interface

UMTS Traffic Classes and QoS Attributes

Supported Applications

References


Physical layer simulations and measurements for the PHY database

UMTS shared channels and MAC scheduling

Signalling delay emulation

QoS API for wireless optimised applications

UMTS Demonstrator - Ongoing Work


UMTS Demonstrator -

Protocol Context

MT

UE CNUTRAN

Radio Protocols Iu Protocols

PDCP

RLC

MAC

FPAALATM

FPAALATM

PHY

PHY

RLC

MAC

IubUu(Radio)

L1

L2

L3

Iu

PHY

CN Edge CN Gateway

Node B RNC SGSN GGSN

PDCP

UMTS Bearer Service

Radio Bearer Service

Buffer

emulated


IP Interface

IP Kernel Module:– Modification of Linux IP kernel– Table of Client/Server IP address pairs: IP packets arriving at the UMTS

Proxy from these hosts are forwarded to the UMTS Module.

IP header address translation:– Uplink: Client Proxy to Proxy Server– Downlink: Server Proxy to Proxy Client– Client and Server both assume the corresponding peer is running on the

Proxy host.– Optional: IP address translation within TCP payload (H.323, FTP)

Checksum re-calculation:– Before error-injection: injected bit-errors result in checksum errors at

the receiver and TCP or UDP packet delay or loss, respectively.– After error-injection: forwarding of bit-errors into an error resilient

application.


UMTS Traffic Classes

Traffic Class Conversational

Conversational RT

Streaming

Streaming RT

Interactive

Interactive best effort

Background

Background besteffort

FundamentalCharacteristics

Preserve timerelation (variation)between informationentities of thestream

Conversationalpattern (stringentand low delay )

Preserve time rela-tion (variation) be-tween informationentities of the stream(i.e. some butconstant delay)

Request responsepattern

Preserve payloadcontent

Destination is notexpecting the datawithin a certaintime

Preserve payloadcontent

ApplicationExamples

Voice,Video,Interactive games

FAX,Streaming audio,Streaming video

Web browsing,Email,Ftp,Database retrieval

Background down-load of email,Backdrop deliveryof email,SMS, FAX,Download fromdatabase


UMTS QoS Attributes

traffic class max. bitrate guaranteed bitrate SDU delivery order maximum SDU size SDU format SDU error ratio residual BER delivery of erroneous SDUs SDU transfer delay traffic handling priority allocation/retention priority


Standard IP applications (ftp, telnet, etc.)

Web browsing

MS NetMeeting

Real Video Streaming

Windows Media Services

Video enhanced messaging (“miLife”)

... most IP based multimedia application are configurable to run through the UMTS Proxy!

Supported Applications


References

S. Gruhl, A. Echihabi, T. Rachidi, M. Link, and M.Söllner, “A Demonstrator for Real-time Multimedia Sessions over 3rd Generation Wireless Networks”, International Conference on Multimedia and Expo (ICME) 2000, New York, 30 Jul. - 2 Aug. 2000.

3GPP TS 23.107: “QoS Concept and Architecture” 3GPP TS 25.201: “Physical layer - general description” 3GPP TS 25.211: “Physical channels and mapping of transport channels onto physical

channels (FDD)” 3GPP TS 25.212: “Multiplexing and channel coding (FDD)” 3GPP TS 25.214: “Physical layer procedures (FDD)” 3GPP TS 25.301: “Radio Interface Protocol Architecture” 3GPP TS 25.302: “Services Provided by the Physical Layer” 3GPP TS 25.401: “UTRAN Overall Description” 3GPP TR 25.944, “Channel coding and multiplexing examples,” GSMA ISG RP-000304: “Typical Radio Parameter Sets Version 1.2”, TSG-RAN

Meeting #8, Düsseldorf, Germany, 21 - 23 June 2000 ITU-T SG 16 Q15-F-45: “Common conditions for video performance evaluation in

H.324/M error-prone systems”

2001-01-26 lucent technologies - proprietary slide 1 untersuchung adaptiver multimedia-anwendungen...

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