ON2 fka ONT

[cksla]

Meeyoung Cha

PhD Student


Advanced Networking Lab

Dept. of Computer Science KAIST


[e-mail]


CS441 Project Presentation
QoS for Premium VoIP service
using Path Diversity



Case Studies: H.264 MPEG-4 oriented QoS


Video Conferencing

Other Applications: Broadcast Digital TV, Wi-Fi network



PolyCom VSX7000



Video Conferencing


To overcome bandwidth constrains, to respond growing standards of video quality, video conferencing equipment vendors are accepting H.264 as industry standards


Improvements in Video Conferencing, H. 264

- With video conference standards (ex: NTSC: 480lines by 720pix @ 30fps) required bandwidth is reduced by half: H.264(384kbps), H.263(768kbps)

- List of featured improvement from H.263:

- Intra Placement - Parameter Sets

- Picture Segmentation - Flexible Marcoblock Ordering

- Reference Picture Selection - RSs

- Data Partitioning


Remarks

- With improvements listed above, MPEG-4 part10 (ISO/IEC 14496-10) custom for H.264 optimizes slicing of MPEG coding. Thus QoS concentration in MPEG slicing will have relatively valuable result than a case without those features; ex H.263 and other older standards.

- Prior to H.264 introduction, adaptation of H.263 generally created problems of inter-operating of different equipment vendors; with H.263 there were over a million possible protocol combinations, making it impossible to accept common infra such as boarder QoS by ISP. Meanwhile introduction of H.264 and market adaptation creates window for common infra service/applications. Thus such model as premium QoS by ISP became more rational.




Other Applications


With H.264 standard, especially with improvements in MPEG codec options, there already exists commercial considerations of QoS


Mobile Streaming QoS by HP Labs (May 2003)

- Overview: end-to-end media delivery over diverse clients for wired and wireless networks

- List of Collaborations:

NTT DoCoMo Japan, NTT DoCoMo USA, Standford, MIT, Berkeley, William and Mary, HP

- Key Issues regarding QoS

- With Combination of Multiple description video coding with Path Diversity, they were able to make significant improvements in burst loss handling and distortion predictions.

*Path diversity is only considered in Network Layer. Thus further considerations of path diversity with Transport and application custom optimization can be considered.


Remarks

- Above is an example of boarder edge-to-edge premium QoS, and shows the market demands and commercial considerations: meanwhile VoIP does not yet have standard such as H.264, more study and optimization is left as standardization further develops.

- Because of such QoS merits and standardization like H.264, many bandwidth constrained applications are rapidly adopting such standards:

Ex: High Definition TV, Mobile Digital Terrestrial Broadcasting

“TOKYO--(BUSINESS WIRE)--March 23, 2004--In a joint press conference with MPEG LA today, Japan broadcasters NHK, TBS, NTV, TV Asahi, Fuji TV and TV Tokyo announce their adoption of AVC/H.264 Video Coding for mobile segment digital terrestrial broadcasting.” ( businesswire.com MAR 23,2004 )