Doc.: IEEE 802.11-01/274 Submission May 2001 John M. Kowalski et al, Sharp. AV Multicast for...
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Transcript of Doc.: IEEE 802.11-01/274 Submission May 2001 John M. Kowalski et al, Sharp. AV Multicast for...
![Page 1: Doc.: IEEE 802.11-01/274 Submission May 2001 John M. Kowalski et al, Sharp. AV Multicast for 802.11e: Benefits/Challenges Sharp Corporation John Kowalski.](https://reader035.fdocuments.net/reader035/viewer/2022062517/56649f2a5503460f94c43d9f/html5/thumbnails/1.jpg)
May 2001
John M. Kowalski et al, Sharp.
Doc.: IEEE 802.11-01/274
Submission
AV Multicast for 802.11e:
Benefits/ChallengesSharp Corporation
John Kowalski
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May 2001
John M. Kowalski et al, Sharp.
Doc.: IEEE 802.11-01/274
Submission
CONTENTS
• Multicast Applications• Limitations of Current & Draft
Standard• Requirements for AV Multicast• Options to meet this challenge• Discussion Points of AV Multicast• Summary
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May 2001
John M. Kowalski et al, Sharp.
Doc.: IEEE 802.11-01/274
Submission
Multicast Application –1• For the Home Application, there are many AV
devices.• “1 to n” communication will be necessary
especially for the AV application. - e.g. Tuner and TV
TV on 2nd floor
TV in Living room
Mobile Viewer
BS/CS Tuner CATV STB
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May 2001
John M. Kowalski et al, Sharp.
Doc.: IEEE 802.11-01/274
Submission
Multicast Application –2• For the Home Application,
Several AV devices will be used for realizing the one AV application. – e.g. Home theater System
Monitor
Stereo
DVD Player
Rear surround speaker
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May 2001
John M. Kowalski et al, Sharp.
Doc.: IEEE 802.11-01/274
Submission
Multicast Application –3• For Office,
Multicast also might be useful. – e.g. Video conference System
Center Projector
VIDEO SharingWhite Board Sharing
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May 2001
John M. Kowalski et al, Sharp.
Doc.: IEEE 802.11-01/274
Submission
Limitations of Current & Draft Standard
• Multicast groups need to be defined -that take advantage of 11e- in order to do true multicasting (as opposed to multiple synch’d streams)
• AND– Multicast is an unacknowledged service
(in 802.2)– BUT we need some ACK mechanism at
least in the near term.
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May 2001
John M. Kowalski et al, Sharp.
Doc.: IEEE 802.11-01/274
Submission
Discussion Points of AV Multicast
• Groupcast address definition for AV Multicast– Which kind of address should be used?– How to make a standard?
• Grouping sequence– How to decide the address? HC? Image
source?– How does the ESTA join the group?– How to inform the group address?
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May 2001
John M. Kowalski et al, Sharp.
Doc.: IEEE 802.11-01/274
Submission
Requirements for AV Multicast
• For realizing the AV application, the followings are required for the Multicast transfer.– Forward error correction (RS-code)– Delayed Acknowledgement– Retransmission mechanism
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May 2001
John M. Kowalski et al, Sharp.
Doc.: IEEE 802.11-01/274
Submission
So what are our options? (1)
• Do nothing – Positive: We don’t have to do
anything.– Negative: We miss out on a huge
application market OR use multiple synch’d streams, which are horrendously inneficient.
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May 2001
John M. Kowalski et al, Sharp.
Doc.: IEEE 802.11-01/274
Submission
So what are our options? (2)
• Work with 802.? to develop recommended practice for QoS enabled multicast groups with acknowledged service – Positive: Would provide a single
solution for all 802.X wireless systems. Long term solution
– Negative: Takes time. Problems with legacy equipment?
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May 2001
John M. Kowalski et al, Sharp.
Doc.: IEEE 802.11-01/274
Submission
So what are our options? (3)
• Provide a solution that works for 802.11– Positive: Would harmonize well with work
going on to integrate 802.11 with AV/1394 systems. Could be done relatively quickly.
– Negative: Would have to provide an interface, and services that would not be conformant to current 802.2 standard.
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May 2001
John M. Kowalski et al, Sharp.
Doc.: IEEE 802.11-01/274
Submission
So what are our options? (4)
• Use Transport Layer via IETF practices for Multicasting...– Positive: Would harmonize well with
work going on to integrate 802.11 with AV/1394 systems. Could be done relatively quickly.
– Negative: Can latency/jitter/buffer size requirements be met?
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May 2001
John M. Kowalski et al, Sharp.
Doc.: IEEE 802.11-01/274
Submission
Summary
• We believe the AV multicast expands the wireless application market greatly for 802.11.
• We want to start the discussion about the AV multicast.
• Any help/additional options would be greatly appreciated.