1. September 2006
doc.: IEEE /0000r0
Mar. 2010
Improving 11aa More Reliable Groupcast (MRG) via 11v Directed Multicast Service (DMS)
Date:
Hart et al. (Cisco Systems)

2. September 2006
doc.: IEEE /0000r0
Mar. 2010
Abstract
The v Directed Multicast Service (DMS) provides a well-defined method for requesting and establishing basic groupcast services. As such, there’s no need for aa More Reliable Groupcast (MRG) to define its own state machine, set of frames or sets of IEs for performing a similar function.
Also, by inheriting the existing 11v DMS framework, 11aa MRG leverages DMS’s richer request feature and its DMSID abbreviation.
This document accompanying normative text changes to 11aa’s MRG in submission 10/0319r0
Herein, we present an overview on those changes and the advantages that we can achieve
Hart et al. (Cisco Systems)

3. MRG-Unsolicited-Retry Robust AV Streaming frames
September 2006
doc.: IEEE /0000r0
Mar. 2010
Existing 11v DMS framework offers valuable building blocks that 11aa MRG can leverage
Color key
Blue: Method to describe MC & GC
Red: Service/Function
Green: Service management (frames, protocols)
Current scenario
Non-MRG
&
MRG-Unsolicited-Retry
MRG-Block-Ack
DMS Req/Resp frames
&
DMS Req/Resp elements
DMS
(11v)
TCLAS
&
TCLAS Processing
MRG-Direct (11aa)
TSPEC
Robust AV Streaming frames
&
MRG Req/Resp elements
11v DMS
11aa MRG
Disadvantages
Much duplication and redundancy
MRG has a one-time client-side request only
Hart et al. (Cisco Systems)

4. By building on 11v DMS, MRG can significantly reduce redundancy
September 2006
doc.: IEEE /0000r0
Mar. 2010
By building on 11v DMS, MRG can significantly reduce redundancy
Color key
Blue: Method to describe MC & GC
Red: Service/Function
Green: Service management (frames, protocols)
Proposed scenario
MRG-Unsolicited-Retry
MRG-Block-Ack
MRG-SP
DMS ~ MRG-Direct
>1 TCLAS
& TCLAS Processing; IP TCLAS
DMS Req/Resp frames
&
DMS Req/Resp elements
TSPEC
TCLAS
MRG Req/Resp
subelements
11aa MRG
11v DMS
Advantages
Removes redundant frames and elements from the standard
MRG is (mostly) a superset of DMS
Multicast-to-unicast is one feature, not two
MRG can use DMSID as a shorthand, and gains the Change Request from DMS
Hart et al. (Cisco Systems)

5. The proposed changes to MRG provide for a more streamlined MRG:
September 2006
doc.: IEEE /0000r0
Mar. 2010
The proposed changes to MRG provide for a more streamlined MRG:
Absorb MRG Request/Response Action frames and MRG Req/Resp elements into DMS framework
Eliminate MRG Request/Response Action frames
Evolve MRG Req/Resp elements into sublements to be contained within DMS Req/Resp elements
Reuse DMS state machine so set up and teardown procedures in become additions to the DMS procedures in clause 11
MRG subclauses in clause 10 are eliminated and instead MRG adds extra parameters in the existing DMS sub-clauses in clause 10
Leverage the DMSID in AP to non-AP STAs frames so that references of existing MRG agreements can be abbreviated (i.e., no need to provide full description of MRG stream every time)
Achieved by including an MRG subelement within a DMS Descriptor
Hart et al. (Cisco Systems)

6. Summary Mar. 2010 By leveraging 11v DMS, we can streamline MRG
September 2006
doc.: IEEE /0000r0
Mar. 2010
Summary
By leveraging 11v DMS, we can streamline MRG
Normative text changes are in accompanying submission 10/0319r0
Changes are contingent on 11v submission 10/0318r0 being accepted at this week’s meeting
Hart et al. (Cisco Systems)