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Alternate EDCA Parameter Set

Alternate EDCA Parameter Set. Authors:. Date: 2010-01-15. Abstract. This proposal fulfils the PAR objective of the 11aa task group: Intra-Access Category prioritization of transport streams by modifying EDCA timing and parameter selection without any requirement for deep packet inspection

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Alternate EDCA Parameter Set

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  1. Alternate EDCA Parameter Set Authors: Date: 2010-01-15 Alex Ashley, NDS Ltd

  2. Abstract This proposal fulfils the PAR objective of the 11aa task group: • Intra-Access Category prioritization of transport streams by modifying EDCA timing and parameter selection without any requirement for deep packet inspection This proposal allows the creation of up to 2 extra EDCA parameter sets to facilitate intra-access category prioritization. Alex Ashley, NDS Ltd

  3. Use Cases • Prioritize all packets in a video stream above/below another video stream • In EDCA and EDCA-AC modes • The higher priority video has a greater chance of channel access Alex Ashley, NDS Ltd

  4. History • Implementation for Intra-AC Differentiated Services • IEEE 802.11-09/0022r0 • Using packet drop precedence for graceful degradation • IEEE 802.11-08/0764r1 • Drop Precedence in wireless, wired-wireless networks • IEEE 802.11-09/0264r0 • Thursday March 12 TGaa + 802.1AVB meeting • IEEE 802.11-09/0371r0 • Stream Classification Service • IEEE 802.11-09/0725r0 Alex Ashley, NDS Ltd

  5. Alternate EDCA Parameter Set • Up to two extra EDCA parameter records • AAC_VI, AAC_VO • Signalled in beacon, probe response, (re)association response • Similar structure to EDCA (WMM) Parameter Set • Alternate Priority Info field used to indicate presence of AAC VI/VO Alex Ashley, NDS Ltd

  6. Alternate EDCA Parameter Set • User Priority -> AC mapping expanded to use these extra EDCA parameters, when supported • Frames are still sent using existing four EDCAF • Extra ACs map to existing EDCAF for transmission Alex Ashley, NDS Ltd

  7. (MSDU, UP) Mapping to Access Category AAC_VO AC_VO AAC_VI AC_VI AC_BE AC_BK Transmit queues for ACs EDCA functions with internal collision resolution VO VI BE BK Frames are sent using existing four EDCAF Figure 9-17—Reference implementation model Alex Ashley, NDS Ltd

  8. Stream Classification Service Interaction The Intra-Access Category Priority element can be used to select use of the alternate EDCA parameter set for a classified stream Removes need to always use table 9-1 mapping For an accepted SCS, the AP shall process subsequent unicast MSDUs that match the classifier specified in the SCS Descriptor. The processing of matching MSDUs depends upon the access policy assigned to the MSDU: For MSDUs that are not part of a TS, the User Priority subfield of the Intra-Access Priority element is used as the UP of these MSDUs. For MSDUs that are not part of a TS, or MSDUs that are part of a TS that uses EDCA or HEMM as the Access Policy, the Alternate Priority subfield of the Intra-Access Priority element is used to select the EDCA Parameter Set for these MSDUs, if the MIB attribute dot11RobustAVStreamingAlternateEDCAEnabled is true. All matching MSDUs are tagged with their drop eligibility using the value from the Drop Eligibility subfield of the Intra-Access Priority element Slide 8 Alex Ashley, NDS Ltd

  9. Changes from previous proposal • Shorter Alternate EDCA Parameter Set • AAC_BE and AAC_BK removed. AAC_VI / AAC_VO only included in element when supported • Removed need for extra EDCAF • Makes it possible to implement on existing h/w • Removed requirement to use CL for AAC_VI • Controlled Load (CL) has defined meaning in enterprise networks • Added default EDCA parameters for AAC_VI and AAC_VO • Same as AC_VI and AC_VO (to allow for implementation on existing h/w that can’t support extra EDCA timing parameters) Alex Ashley, NDS Ltd

  10. Conclusions This proposal fulfils the PAR objective of the 11aa task group: • Intra-Access Category prioritization of transport streams by modifying EDCA timing and parameter selection without any requirement for deep packet inspection • Creation of up to two extra EDCA parameter sets to facilitate intra-access category prioritization • This proposal scales from existing h/w that just add prioritized queuing in front of existing EDCA, to implementations providing full per-AC queuing and timing Alex Ashley, NDS Ltd

  11. References • 11-09-0850r1 “Alternate EDCA Parameter Set” • 11-09-0726r0 “Stream Classification Service” • 11-09/0022r0 “Implementation for Intra-AC Differentiated Services” • 11-08/0764r1 “Using packet drop precedence for graceful degradation” • 11-09/0264r0 “Drop Precedence in wireless, wired-wireless networks” • 11-09/0371r0 “TGaa minutes for Vancouver” Alex Ashley, NDS Ltd

  12. Motion • Move to incorporate the text changes in 11-09-0850-01-00aa-alternate-edca-parameter-set.doc into the TGaa draft • Moved: • Seconded: • Result: Alex Ashley, NDS Ltd

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