1. CID#89-Directed Multicast Service (DMS)
Month Year
Month Year
doc.: IEEE yy/xxxxr0
doc.: IEEE yy/xxxxr0
January 2008
CID#89-Directed Multicast Service (DMS)
Authors:
Date:
Slide 1
Emily Qi (Intel Corp) et al
Page 1
Emily Qi
John Doe, Some Company

2. Month Year
Month Year
doc.: IEEE yy/xxxxr0
doc.: IEEE yy/xxxxr0
January 2008
Abstract
The proposal provides a directed multicast service to allow AP to transmit group addressed frames as individually addressed frames.
The original comment (LB108 CID #89) is to use FBMS frames to facilitate directed multicast delivery. A separate submission was suggested while reviewing CID #89 in the TGv teleconference.
Slide 2
Emily Qi (Intel Corp) et al
Page 2
Emily Qi
John Doe, Some Company

3. Agenda Problem Statement Proposed Solution and Benefits
Month Year
doc.: IEEE yy/xxxxr0
January 2008
Agenda
Problem Statement
Proposed Solution and Benefits
Proposed Changes
Slide 3
Emily Qi (Intel Corp) et al
Emily Qi

4. January 2008
Problem Statement
Issue: clients may be compliant with different protection methods, e.g. Open Authentication, WEP, TKIP or AES-CCMP
Today’s solution: a single protection method (the lowest common method supported by all devices) for Broadcast/multicast traffic delivery within the BSS.
Issue with Today’s solution: some clients may require AES security while other might only use open authentication in hot spot, citywide, and home environment,
For example, in hot spot or citywide deployment, most service announcement traffic is transmitted via broadcast, rouge AP can forge these information, generating DOS.
Slide 4
Emily Qi (Intel Corp) et al

5. Solution and Benefits Solution: Benefits:
January 2008
Solution and Benefits
Solution:
Directed Multicast: Transmit multicast as unicast per client’s request
Benefits:
Enable different security methods for different clients for home, hotspot, and citywide
Provide authenticity and integrity protection if lowest common method is open auth.
Enable reliable service
Unicast is more reliable than multicast
Enable aggressive client power scheme
Client doesn’t need to wake up at DTIM or any FBMS intervals to receive multicast frames
Slide 5
Emily Qi (Intel Corp) et al

6. Proposed Solution: Directed Multicast
January 2008
Proposed Solution: Directed Multicast
STA advertise its Directed Multicast Capability
Non-AP STA sends a request to specify traffic class for the directed multicast traffic delivery
AP may accept or reject the traffic class specified by the non-AP STA
If the service is accepted by the AP,
AP shall transmit the requested group addressed (broadcast/multicast) traffic as the individual addressed (unicast) traffic to the requesting STA, and AP still transmits the group addressed traffic for other STAs in the BSS as normal
Other STAs will process group addressed traffic as normal
The requesting STA shall filter out the duplicated group addressed traffic to avoid traffic duplication
Slide 6
Emily Qi (Intel Corp) et al

7. Proposed Changes Define a Capability bit “Directed Multicast”
January 2008
Proposed Changes
Define a Capability bit “Directed Multicast”
Option 1: Use FBMS Request and Response frames
Define a new field Directed Multicast. The Directed Multicast field set to 1 for “Enabled” , set to 0 for “Disabled”.
No new frames, but will define new procedure.
Change is small
Option 2: Define new Action frames, Directed Multicast Service (DMS) request and response
New frames and will define procedure
Change is cleaner
Slide 7
Emily Qi (Intel Corp) et al

8. Option 2: DMS Request and Response frames
Month Year
doc.: IEEE yy/xxxxr0
January 2008
Option 2: DMS Request and Response frames
DMS Request frame:
Category
Action
Dialog Token
Request Type (“Add” or “Remove”)
DMS Descriptor List
Octets: 1
variable
DMS ID
Length (optional)
TCLAS Elements (optional)
TCLAS Processing Element (optional)
Octets: 1
variable 3
DMS
Descriptor
DMS Response frame:
Category
Action
Dialog Token
DMS Status List
Octets: 1
DMS Status
DMS ID
DMS Status
Octets: 1
Emily Qi (Intel Corp) et al
Slide 8
Emily Qi

9. Thank You! & Questions? January 2008 Month Year
doc.: IEEE yy/xxxxr0
January 2008
Thank You! & Questions?
Slide 9
Emily Qi (Intel Corp) et al
Emily Qi