1. Leader based Multicast
Date:
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Yongho SEOK

2. Abstract This document proposes the leader based multicast mechanism.
First, we introduce the problems of the current multicast mechanism.
Second, we propose the leader based multicast mechanism to improve the multicast performance.
Third, we show the benefits of the leader based multicast mechanism with the experimental results.
At the end of the presentation, there will be a motion to include normative text of this proposal in v draft.
Yongho SEOK

3. Introduction Increasing quantity of WiFi enabled portable devices
Growing availability of multimedia streaming
Increasing WiFi coverage on public places
The best option: Multicast
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4. Problem Current implementation of Multicast: Open Loop Transmission
No CW adaptation
No rate adaptation
No retransmission
Multicast transmission
starts
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5. Proposed solution Leader-based Multicast: [Kuri and Kasera]
-Choose one receiver as the Leader
Send back ACK to the AP
STA1
STA2
STA4
STA3
ACK
STA5[Leader]
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6. Proposed solution Leader Election Protocol
Leader is elected using three Action frames
Leader Selection Algorithm
-It is possible to utilize IEEE v multicast diagnostic capability
The station with the highest PER may be selected to the Leader
New Leader
Old Leader
New Leader
Old Leader
New Leader
Old Leader
(a) Leader Request Action
(b) Leader Response Action
(b) Leader Release Action
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7. Experimentation: Platform
5 Probes for data acquisition and traffic generation
1 Software-based Access Point
Uniform Wireless Hardware (Atheros-based Proxim cards)
Wireless Probe
Wireless Probe
Wireless Probe
Wireless Probe
Wireless Probe
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8. Experimentation: Controlled conditions
4 Experiments: 5 tests of 5 minutes of VBR video streaming
Legacy Multicast without background traffic
Legacy Multicast with TCP background traffic
Leader based without background traffic.
Leader based with TCP background traffic
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9. Results Video Goodput for both mechanisms Leader based
Legacy Multicast
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10. Results Packet Loss Correlation without retransmissions Uncorrelated
Collision
Collision
Uncorrelated
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11. Conclusion Leader based solution:
Better throughput than Legacy multicast
Can follow the VBR test video requirements
Increases throughput with retransmissions on a loaded network
Low complexity to be implemented
Compatible with legacy station
Yongho SEOK

12. Motion
Move to include normative text in document v-normative-text-leader-based-multicast.doc into the TGv draft.
Mover:
Seconder:
Result:
Yongho SEOK