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802.11 -- Interworking with 802.1Qat Stream Reservation Protocol

802.11 -- Interworking with 802.1Qat Stream Reservation Protocol. Date: 2009-08-09. Authors:. Abstract. This submission is an overview of proposed input from 802.11 to 802.1Qat Annex-Q Clause Q.2. A companion word document will be generated when the details in this submission are finalized.

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802.11 -- Interworking with 802.1Qat Stream Reservation Protocol

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  1. 802.11 -- Interworking with 802.1Qat Stream Reservation Protocol Date: 2009-08-09 Authors: Ganesh Venkatesan, Intel Corporation

  2. Abstract This submission is an overview of proposed input from 802.11 to 802.1Qat Annex-Q Clause Q.2. A companion word document will be generated when the details in this submission are finalized. Slide 2 Ganesh Venkatesan, Intel Corporation

  3. Overview • Annex-Q in IEEE 802.1Qat-Draft 3.2 is informative and describes implementation details for a Designated MSRP Node (DMN) • From 802.11’s perspective, the DMN is co-located with the device that supports the AP function in a BSS • When stream reservations are made the following needs to be completed: • Appropriate TSPECs are passed to the AP in order to accomplish the desired level of QoS for the stream (Cl. Q.2.2 Table Q-4) • All protocol and MLME interface semantics are maintained within 802.11 (Cl. Q.2.2 Table Q-3) Ganesh Venkatesan, Intel Corporation

  4. Topologies • Figure Q-5 Talker is wired to the AP. Listeners can be STA(s) in the BSS or device(s) wired to the STA(s) in the BSS, • Figure Q-6 Talker is wired to a STA in the BSS. Listeners can be other STA(s) in the BSS and/or device(s) wired to the AP/STA(s) • Figure Q-7 Talker is wired to a STA (STA-A) in the BSS. Listener is another STA in the BSS which has a direct link established with STA-A. • Question: Can STAs be intermediate nodes? If so, • STAs need a “SRP agent” co-located • Figures Q-5, Q-6 and Q-7 need to be updated to show that possibility. Ganesh Venkatesan, Intel Corporation

  5. Q.2.1 MSRP Handling • In Figure Q-8, MLME TS Request from the DMN to the Q-AP, MLME TS Response to the DMN are not supported in 802.11 (See Cl. 10.3.24.0a in 802.11mb Draft1.0) Ganesh Venkatesan, Intel Corporation

  6. Q.2.1 MSRP Handling • DMN invokes MLME-Reserve.request with parameters corresponding to the received SRP reservation request • Reserve Request Action frame includes a TSPEC that corresponds to the SRP traffic class • Q-STA uses the TSPEC in the Reserve Request Action frame as a hint and constructs a TSPEC to be used in the resulting ADDTS request • Q-STA receives a “successful” ADDTS response from the Q-AP • Q-STA responds back to the Q-AP with a Reserve Response Action frame • Q-AP responds to the DMN with a MLME-Reserve.confirm Ganesh Venkatesan, Intel Corporation

  7. Table Q.3 SRP to MLME QoS Services Mapping MAD – MRP (Multiple Registration Protocol) Attribute Declaration Ganesh Venkatesan, Intel Corporation

  8. Questions on Table Q-3 • Is there an 802.11 MLME command to query available bandwidth • No. • Is there an 802.11 MLME command for this? Is this bandwidth renewal even necessary? • ADDTS with the same stream ID supersedes an existing reservation. • Reservation renewal may be required if the reservation has timed out due to inactivity. Ganesh Venkatesan, Intel Corporation

  9. Questions on Table Q-3 • Is there an 802.11 MLME command to query available bandwidth • No. • Is there an 802.11 MLME command for this? Is this bandwidth renewal even necessary? • ADDTS with the same stream ID supersedes an existing reservation. • Reservation renewal may be required if the reservation has timed out due to inactivity. Ganesh Venkatesan, Intel Corporation

  10. TSPEC mapping (from July joint meeting) 802.11 TSPEC mapping to 802.1Qav TSPEC 802.11 QoS mechanisms: EDCA-AC HCCA What is the delay over a 802.11 link? Power save introduces at least 20msec delay What is possible for delay/frame size/rate in .11? Slide 10 Ganesh Venkatesan, Intel Corporation

  11. TSPEC Element TSPEC Body format RED indicates required parameters used in Admission Control TSPEC Value returned by AP if Admission Accepted (Admission Control) TS Info Field TSPEC Element 801.D User Priority Up Down Bi 1=APSD 0-7 WMM 8-15 HCCA Access Policy EDCA, HCCA Note: Often TID 0-7 = UP * Reproduced from https://mentor.ieee.org/802.11/dcn/08/11-08-1214-02-00aa-11e-tutorial.ppt Ganesh Venkatesan, Intel Corporation

  12. TSPECs for HCCA (WMM-SA) The basic QoS requirements such as jitter, latency, bandwidth etc are defined by the TSPEC • ‘Standard’ TSPECs exist for: • Voice • Multi-Media (Video) • Audio STAs send information on their TC and TSPEC, this allows HC to allocate the TXOPs and calculate QoS requirements (jitter, latency, bandwidth, etc.) Ganesh Venkatesan, Intel Corporation

  13. 802.11 TSPECs (EDCA-AC) Ganesh Venkatesan, Intel Corporation

  14. TSPECs for HCCA (WMM-SA) Ganesh Venkatesan, Intel Corporation

  15. Table Q-4 • Recommend replacing this table with two tables • EDCA-AC for Class-A and Class-B (do we need one each for IEEE 802.11 and WFA WMM?) • HCCA for Class-A and Class-B Ganesh Venkatesan, Intel Corporation

  16. References 802.11 QoS Tutorial (08/1214r02) Slide 16 Ganesh Venkatesan, Intel Corporation

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