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AV Multicast for 802.11e: Benefits/Challenges

AV Multicast for 802.11e: Benefits/Challenges. Sharp Corporation John Kowalski. CONTENTS. Multicast Applications Limitations of Current & Draft Standard Requirements for AV Multicast Options to meet this challenge Discussion Points of AV Multicast Summary. Multicast Application –1.

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AV Multicast for 802.11e: Benefits/Challenges

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  1. AV Multicast for 802.11e:Benefits/Challenges Sharp Corporation John Kowalski John M. Kowalski et al, Sharp.

  2. CONTENTS • Multicast Applications • Limitations of Current & Draft Standard • Requirements for AV Multicast • Options to meet this challenge • Discussion Points of AV Multicast • Summary John M. Kowalski et al, Sharp.

  3. 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 Mobile Viewer BS/CS Tuner CATV STB TV in Living room John M. Kowalski et al, Sharp.

  4. Multicast Application –2 • For the Home Application,Several AV devices will be used for realizing the one AV application. – e.g. Home theater System Stereo Monitor DVD Player Rear surround speaker John M. Kowalski et al, Sharp.

  5. Multicast Application –3 • For Office,Multicast also might be useful. – e.g. Video conference System VIDEO SharingWhite Board Sharing Center Projector John M. Kowalski et al, Sharp.

  6. 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. John M. Kowalski et al, Sharp.

  7. Discussion Points of AVMulticast • 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? John M. Kowalski et al, Sharp.

  8. 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 John M. Kowalski et al, Sharp.

  9. 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. John M. Kowalski et al, Sharp.

  10. 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? John M. Kowalski et al, Sharp.

  11. 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. John M. Kowalski et al, Sharp.

  12. 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? John M. Kowalski et al, Sharp.

  13. 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. John M. Kowalski et al, Sharp.

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