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Multimedia Gateways & H.248/ MEGACO. ITU Workshop on IP Networking & MEDIACOM-2004 April 26, 2001 Presented by- Clifford Sayre, Lucent Technologies. Multimedia Gateways. This presentation is the joint work of several teams: NTT DoCoMo Takashi Suzuki - (ITU-T SG 16 delegate)

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slide1

Multimedia Gateways

& H.248/ MEGACO

ITU Workshop on IP Networking & MEDIACOM-2004

April 26, 2001

Presented by-

Clifford Sayre, Lucent Technologies

multimedia gateways
Multimedia Gateways
  • This presentation is the joint work of several teams:
  • NTT DoCoMo
    • Takashi Suzuki - (ITU-T SG 16 delegate)
  • NTT DoCoMo Communications Laboratories USA
    • Muhammad Mukarram Bin Tariq
    • Shahid Shoaib
  • Lucent Technologies
    • Clifford Sayre - (ITU-T SG 16 delegate)
overview
Overview
  • Introduction to IMT-2000 & New Capabilities
  • Emerging Wireless Multimedia Applications
  • H.324M/ 3G-324M Standard for Wireless Multimedia
  • Interworking with the ITU-T H.3XX Series
  • MEGACO/H.248 as Key Element in Interworking Gateway
features of imt 2000
Features of IMT-2000
  • High Speed Data and Video Transmission
    • Maximum bit rate: 384kbps (outdoor), 2Mbps (Indoor)
  • Global Mobility
  • High quality transmission
    • Appropriate quality for each application can be provided
    • From 10-3 to 10-6
  • Improved Frequency Efficiency
    • The same frequency band can accommodate a greater number of users
  • The network platform for the Mobile Multimedia Applications
    • Video Phone
    • Video Mail
    • Video Distribution (streaming / download)
bearers of imt 2000 and the type of services
Bearers of IMT-2000 and the Type of Services

Type of Bearers

Bearers

Services to be Covered

  • Audio/Video Application over Circuit Switched Bearer
    • Based on 3GPP 3G-324M
    • Various applications with 3G-324M
      • Video phone
      • Video mail / Video answering
      • Audio/Visual content distribution
  • Interworking between 3G-324M and other networks
    • Important to launch mobile multimedia successfully

Circuit Switched

Voice Communication

Voice

Non-specified Digital

Internet

Audio/Video Communication

Video phone (3GPP 3G-324M)

Packet Switched

Packet

Internet

interworking between multimedia terminals
Interworking Between Multimedia Terminals
  • Interworking with Multimedia terminal on the Internet
  • Interworking with Multimedia terminal on the PS mobile network
  • 3G-324M – H.323/SIP Interworking

SS7

Packet Switched

Mobile Network

MGC

Circuit Switched Mobile NW

H.248

MT (PS)

(SIP/H.323)

3G-324M

MG

Internet

H.323/SIP

3gpp 3g 324m overview
3GPP 3G-324M Overview
  • ITU-T developed H.324 Mobile extension (H.324M)
    • H.324 Annex C has been established in ’98.2
    • Improved error robustness
      • Error robust multiplexing (H.223 Annex A ~ C)
      • Efficient transport of H.245 control messages
  • 3GPP extended H.324 Annex C
    • 3G-324M has been established in ’99.12
    • Specified the audio/video CODECs suitable for Wireless Network
      • Mandatory support of AMR speech CODEC
      • Mandatory support of H.263 baseline
      • Optionally but recommended support of MPEG-4 Simple Profile @ Level 0
    • Specified the multiplexing for Wireless Network
      • Mandatory support of H.223 Level 2 (Annex B)
    • Added several clarifications
      • Based on the interoperability test carried out by the interested companies
      • Described in 3G-324M Implementor’s Guide
building blocks of 3g 324m h 324m
Building Blocks of 3G-324M/ H.324M
  • H.223 multiplexed bitstream is mapped onto digital channel
  • Bearer control messages are delivered as in-band data
  • Modem/Mode negotiation is not applied

Out-band

Call Control

In-band

Bearer Control

H.245

Wireless

Network

Wireless Network I/F

Audio CODEC

AMR

H.223 Annex B

Video CODEC

H.263/MPEG-4

interworking with h 323
Interworking With H.323
  • Interworking with H.323 system requires:
    • Mapping of Call Control Signaling
    • Mapping of Bearer Control Signaling (I.e. H.245)
    • Conversion of Media Transport Format
    • Media Transcoding

3G-324M

H.323

Call Control

Q.931/H.225.0

TCP

Bearer Control

H.245

Bearer Control

H.245

Wireless Network I/F

IP

Audio CODEC

AMR

Audio CODEC

H.223 Annex B

RTP/UDP

Video CODEC

H.263/MPEG-4

Video CODEC

interworking with sip
Interworking with SIP
  • Interworking with SIP requires:
    • Mapping of Call Control /Bearer Control Signaling to SIP/SDP
    • Conversion of Media Transport Format
    • Media Transcoding

3G-324M

SIP

Call Control

SIP/SDP

TCP or UDP

Bearer Control

H.245

Wireless Network I/F

IP

Audio CODEC

AMR

Audio CODEC

H.223 Annex B

RTP/UDP

Video CODEC

H.263/MPEG-4

Video CODEC

interworking gateway decomposition
Interworking & Gateway Decomposition
  • Requirements for gateway
    • Decomposed GW shall be able to achieve the same interworking functionalities as Monolithic GW
    • Able to communicate with any 3G-324M/ H.324M compliant terminal
    • Easy to achieve compatibility between MG and MGC from different vendors
    • Less interactions between MG and MGC are better
      • For compatibility between MG and MGC
      • For reduction of signaling traffic (to accommodate tens of millions of customers)
gateway configuration
Gateway Configuration
  • Proposed configuration
    • H.248/ MEGACO protocol for MGC to MG control
    • MGC for call control/ signaling
    • MG for media stream processing
    • MG or MGC for media stream control (H.245) varying with application
    • Advantages
      • Distributed architecture
      • Scalability
      • Synergy with converged voice/data network architectures
  • H.248/ MEGACO advantages for multimedia
    • Support for multiple terminations in a call context
    • Media descriptors for voice & video signals
    • Packages provide flexibility for extensions & customization
    • ITU-T SG 16 to standardize packages for H.324M support
configuration of 3g 324m h 323 gateway
Configuration of 3G-324M – H.323 Gateway
  • Add/Delete H.245 termination
  • Rough Resource Control
  • (max. no of audio/video termination)

Bearer Control (H.245) in MG

MGC

Call

Control

H.225.0

*

Resource

Control

  • Control Audio/Video streams
  • Based on H.245 signaling
  • Follow the limitations set by MGC

H.248

MG

H.245

H.245

NT

*

H.323

IP

3G-324M

wireless

TDM

H.223

LC

Audio

NT

*

LC

Video

NT

*

LC:Logical Channel

NT:Network Termination

other configuration
Other Configuration

Bearer Control (H.245) in MGC

MGC

Call

Control

H.225.0

*

H.245

*

H.245

Resource

Control

Backhaul of H.245

H.248

MG

H.245

H.323

IP

3G-324M

wireless

TDM

H.223

LC

Audio

NT

*

LC

Video

NT

*

LC:Logical Channel

NT:Network Termination

complementary standards
Complementary Standards
  • Complementary standards from different organizations enable:
    • Wireless multimedia telephony
    • Interworking between wireless multimedia and ITU-T H.3XX series
  • ITU-T Standards
    • Circuit switched standards such as H.324M
    • Packet switched standards such as H.323
    • Interworking standards such as H.246
  • Joint IETF & ITU-T
    • Media gateway control with MEGACO/ H.248
  • IETF Standards
    • IP/ packet standards such as SDP, RTP, & TCP
  • 3GPP Standards
    • Wireless standards such as 3G-324M & GSM-AMR speech
  • ISO/ MPEG Standards
    • Multimedia standards such as MPEG-4 video
summary
Summary
  • Emerging wireless multimedia applications
    • Based on 3G-324M/ H.324M
    • Supported as 3GPP circuit switched service
  • Interworking to other networks
    • Scenarios for H.3XX series terminals
    • Scenarios for other terminals, such as SIP terminals
  • Gateways to support interworking
    • Flexible architecture with MGC & MG elements
    • H.248/ MEGACO protocol for MGC to MG control
  • Complementary standards help support interworking scenarios
multimedia gateways17
Multimedia Gateways
  • Back up slides and additional information
h 324m transport via ip tunneling
H.324M Transport Via IP Tunneling
  • 3G-324M audiovisual call via IP-based core network
    • Save the resource of MG and core network by multiplexing audio and video stream into one connection
    • Enable precise audio and video synchronization between GWs

Bearer Independent Call Control

MGC

MGC

IP-based Core NW

H.248

H.248

Circuit Switched Radio Access NW

Circuit Switched Radio Access NW

MG

MG

IP tunneling of

3G-324M stream

3G-324M

3G-324M

configuration of tunneling gateway
Configuration of tunneling gateway
  • Gateway for tunneling

MGC

MGC

*

Resource

Control

H.248

MG

MG

NT

3G-324M

3G-324M

TDM

H.223

*

LC:Logical Channel

NT:Network