Multimedia via Data Networks

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Multimedia via Data Networks
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Agenda

• IP services in mobile telephony
• Voice over IP
• (High Definition) Video over IP
• Video on demand
• Video conferencing
• Download

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Integrated Multiservice NetworksData/Voice/Video
SNA
Data
Multiservice Network
Voice
Video
Packet-Based
Internet
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Multimedia via Data Networks
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GSM/3G Mobile Telephony
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Talsarunu tarifi (USD/min) VoIP un Lattelekom
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SIP phones

• Basic SIP IP phones below 100
• 802.11 phones
• video phones
• Speakerphones
• PDAs with SIP software
• MAC, Unix, and MSoft.

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Voice Quality Guidelines
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Silence Suppression by Voice Activity Detection
Voice Activity Detection (VAD)
Speech
Silence
Speech
No Cells
Cells
Cells
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Fax over IP
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H.323 MCU

• Responsible for managing multipoint conferences
  (two or more endpoints engaged in a conference)
• The MCU contains
• a Multipoint Controller (MC) that manages the
  call signaling
• may optionally have Multipoint Processors (MPs)
  to handle media mixing, switching, or other media
  processing

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Multisite Videoconferencing
MCU
Streaming server
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A Integrated SIP Service System
Desktop SIP clients
H.323
sip323
Gatekeeper
SIP-H.323 signaling gateway
sipd
SIP
Programmable SIP servers
Conferencing
Hardware SIP phone
sipum
Unified messaging
sipgw
RTSP
rtspd
SIP-MGCP gateway
MGCP
Streaming media
SIP-PSTN gateway
PSTN
Regular telephones
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ENUM example Voice
PSTN
Internet
6.5.4.3.2.1.0.8.7.3.4.e164.arpa
4. sipmah_at_nic.at43.at
2. 43 780.
5. INVITE sipmah_at_nic.at43.at
Telekom PSTN Switch
nic.at43.at
PSTN-IP Gateway
1. 43 780 123456
6. INVITE sipmah_at_nic.at43.at
sipmah_at_nic.at43.at
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ENUM example SMS delivery
PSTN
Internet
6.5.4.3.2.1.0.8.7.3.4.e164.arpa
4. sipmah_at_nic.at43.at
2. SMS via SMPP
5. MESSAGE sipmah_at_nic.at43.at
MO SMS Center
nic.at43.at
at43 SMPPServer
6. MESSAGE sipmah_at_nic.at43.at
1. SMS an 43 780 123456
sipmah_at_nic.at43.at
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cross-domain call ENUM
IN NAPTR 7.3.5.7.3.2.2.4.2.6.0.1.8.7.8.e164.arpa.
?
... NAPTR ... "!.!sip19343_at_fwd.pulver.com!"
DNS SRV lookup fwd.pulver.com
878106242237537
sip19343_at_fwd.pulver.com
session
sipaxelm_at_nic.at43.at
sipmah_at_nic.at43.at
sip18341_at_fwd.pulver.com
sip19343_at_fwd.pulver.com
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PBX2PBX using ENUM
442079025500
PBX
442079025500
ENUM
421257296666
Asterisk
Asterisk
Linux PBX
Linux PBX
PCM or SIP or IAX or H.323
PCM or SIP or IAX or H.323
sip2666_at_stuba.sk
IN NAPTR 6.6.6.6.9.2.7.5.2.1.2.4e164.arpa. ?
ENUM
DNS
... NAPTR ... "!\\421257296(.)!sip2\\1_at_stuba.s
k!"
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Skype

• Based on Kazaa Overlay network
• Unstructured p2p file sharing overlay
• Overlay p2p network consisting of ordinary and
  Super Nodes (SN).
• Ordinary node connects to network through a Super
  Node.
• Centralized authentication server
• Excellent Audio quality based on Internet Low Bit
  rate Codec ILBC (http//rfc3951.x42.com/)

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iLBC MOS (Audio Quality) behavior versus
percentage packet loss
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Skype

• Skype client listens on configured TCP and UDP
  ports.
• Uses a variant of STUN to identify the type of
  NAT and firewall.
• Usage of TCP port 80 enables client to reach
  super node even through firewalls.
• Call signaling is done over TCP, messages are
  preferably transported over UDP.
• In the presence of NAT or firewalls, calls
  between caller and callee are routed by an
  intermediate node
• All Skype messages are encrypted.

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HD Video resolution
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HD video size
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1.2 High Quality Digital Video Technologies
Resolution Bandwidth Delay
HDTV Uncompressed 1080i (1920x1080 30fps)720p(1280x720 60fps) 11.5Gbps 100msec
HDTV MPEG2 1080i (1920x1080 30fps)720p(1280x720 60fps) 2080Mbps 12 sec
HDTV H.264 1080i (1920x1080 30fps)720p(1280x720 60fps) 10Mbps 23 sec
SDTV Uncompressed 480i(720x480 30fps) 250Mbps 100msec
SDTV DV 480i(720x480 30fps) 30Mbps 300msec
SDTV MPEG2 480i(720x480 30fps) 56Mbps 12 sec
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Video Streaming Over the Network
Bandwidth
10Gbps
QHD
1Gbps
10Mbps
HD
DVD
WMV
100Mbps
5Mbps
SD
MPEG4
50Mbps
MPEG2
DV
H.263
1.5Mbps
25Mbps
MPEG1
H.261
128Kbps
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Lab Tests
LDK-6000
PDP-502MX
Centaurus
1.485 Gbps
SMPTE 292M
SMPTE 292M
10 GigE
RTP/UDP/IP
UltraGrid Sender
UltraGrid Receiver

• Back-2-back tests
• Video 720p
• Duration 10 min
• RTT 70 µs
• MTU 8800 bytes

• Results
• No loss or reordering
• 1198.03 Mbps throughput
• Total 10,178,098 packets sent and received

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HDV over IP system
HD Camcorder
HD Display
TS Packets
MPEG-2 TS

IEEE1394Interface
IP Network


Packetizer and MPEG2 Decoder
Packetizer

RTP Packets
Sender
Receiver
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i2CAT experiences with HD

• 2001 Open Opera
• Live transmission of an Opera (La Traviata) from
  Liceu Opera House to a cinema both in Barcelona
  to compare spectators feelings.
• After several tests with experts, we concluded
  that the only acceptable quality was uncompressed
  high definition

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Video Packetization and IP Transport

• RTP packetization is based on
• RTP Payload Format for Uncompressed Video,
  RFC 4175
• Ladan Gharai and Colin Perkins
• RFC 4175 covers packetization of various video
  formats
• Supports range of formats including standard
  high definition video
• Interlaced and progressive
• RGB, RGBA, BGR, BGRA, YUV
• Various color sub-sampling 444, 422, 420,
  411

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RTP

• RFC 1889 RTP A Transport Protocol for Real-Time
  Applications
• RFC 2250 RTP Payload format for MPEG1/MPEG2
  Video
• RTP Payload contain integral number of MPEG
  transport packet (188byte).
• Suggest several MPEG picture fragmentation rules.
• RTP Header fields for MPEG2 Video

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