UMTS%20Demonstrator%20ITG%20Workshop%202000-01-26

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Untersuchung Adaptiver Multimedia-Anwendungen
über UMTS
Michael Link, Stefan Gruhl, Markus Bauer,
Michael SöllnerGlobal Wireless Systems
ResearchBell Labs, Nürnberg mlink_at_lucent.com
ITG Workshop IP in Telekommunikationsnetzen26.0
1.2001
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3G Wireless Multimedia
Personal Information Management
Unified Messaging
Video Streaming
3G Wireless Network
IP
MultimediaApplication Clients
Content Access
MultimediaApplication Servers
M-Commerce
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Outline

• UMTS QoS Framework
• UMTS Demonstrator
• Objectives and Concepts
• Architecture
• QoS Flows Concept
• Radio Link Emulation
• Configuration Monitoring Tool
• Application Example

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UMTS QoS Framework
Server
Client
End-to-End Application QoS requirements
adaptation
API
UMTS
GPRS
Hiperlan .
UMTS
UMTS
End-to-End Bearer Service
UMTS Bearer Service UMTS QoS
TE/MT Local Bearer Service
External Bearer Service
Radio Access Bearer Service
CN Bearer Service
Radio Bearer Service
Iu Bearer Service
Backbone Bearer Service
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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

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UMTS Demonstrator - Concepts
WLAN
LAN
Application Server
Application Client
UMTS Proxy

• 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

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UMTS Demonstrator - Architecture
Application Client
Application Server
UMTS Proxy Configurator
UMTS Proxy
IP Kernel Module
LAN
LAN
IP Dispatcher
UMTS Module
IP Address Translation Checksum
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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

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Emulated UMTS Services
Mapping of UMTS Traffic Class and bit-rate to
radio protocol parameters
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UMTS Radio Link Emulation
IP packet from IP translation
to IP
Flow identification
Database Service parameters Frame
error model parameters Error
gap distributions
IP queues
UMTS Layers RLC MAC PHY
RLC error control re-assembly
RLCsegmentation on demand
retransmission requests
MAC scheduling
CRC flags
frame
PHY frame error model bit error injection
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PHY Emulation

• 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

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Configuration Monitoring Tool
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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)

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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 stream20/34/45/80/150/225/350/4
  50 kbps(audio 5-32 kbps)
• buffer ? 3 seconds

• UMTS Proxy
• Frame error model PB 0.01, LB 2,
• Service
• Streaming 128 kbps, RLC ARQ off
• Streaming 128 kbps, RLC ARQ on
• Streaming 64 kbps, RLC ARQ on
• buffer 3 seconds (48 kB / 24 kB)

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Example Session - Traces
Windows Media Streaming
Real Video Streaming
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Conclusion
The UMTS Demonstrator is an integrated,
real-time UMTS radio link emulator application
monitoring tool.
Application Server
UMTSRadio LinkEmulator
Application Client
IP
IP
Configuration Monitoring Tool
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Backup Slides

• Ongoing Work
• Protocol Context
• IP Interface
• UMTS Traffic Classes and QoS Attributes
• Supported Applications
• References

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UMTS Demonstrator - Ongoing Work

• Physical layer simulations and measurements for
  the PHY database
• UMTS shared channels and MAC scheduling
• Signalling delay emulation
• QoS API for wireless optimised applications

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UMTS Demonstrator - Protocol Context
UMTS Bearer Service
Radio Bearer Service
Radio Protocols
Iu Protocols
CN Edge
CN Gateway
L3

PDCP
PDCP
RLC
RLC
L2
MAC
MAC
PHY
PHY

FPAALATM
FPAALATM
PHY
L1
Buffer
Iub
Uu(Radio)
Iu
MT
GGSN
Node B
RNC
SGSN
UE
CN
UTRAN
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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.

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UMTS Traffic Classes
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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

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Supported Applications

• 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!

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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