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Improving 11aa More Reliable Groupcast (MRG) via 11v Directed Multicast Service (DMS)

This document proposes using the 802.11v Directed Multicast Service (DMS) framework to enhance the 802.11aa More Reliable Groupcast (MRG) service. By leveraging the existing DMS framework, we can reduce redundancy and streamline MRG, leading to improved reliability in groupcast services.

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Improving 11aa More Reliable Groupcast (MRG) via 11v Directed Multicast Service (DMS)

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  1. Improving 11aa More Reliable Groupcast (MRG) via 11v Directed Multicast Service (DMS) • Date: 2010-03-13 Hart et al. (Cisco Systems)

  2. Abstract • The 802.11v Directed Multicast Service (DMS) provides a well-defined method for requesting and establishing basic groupcast services. As such, there’s no need for 802.11aa 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. 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 Disadvantages • Much duplication and redundancy • MRG has a one-time client-side request only 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 11aa MRG 11v DMS Hart et al. (Cisco Systems)

  4. 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 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 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 Hart et al. (Cisco Systems)

  5. 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 9.2.7.32 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 • 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)

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