WME Overview 7/20/03 doc.: IEEE /678r0 July 2003

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Presentation transcript:

WME Overview 7/20/03 doc.: IEEE 802.11-02/678r0 July 2003 Thomas Kuehnel, et. al. Bob Meier, Cisco Systems

July 2003 WME Motivation Avoid multiple proprietary solutions (prevent market fragmentation) Implementation guidelines Early deployment of QoS A subset of 802.11e Direct migration path to 802.11e Addresses letter ballot comments Thomas Kuehnel, et. al.

Letter Ballot Comments July 2003 Letter Ballot Comments EDCF Post-backoff: 267 Explicit Admission Control/TSPEC: 184 QoS Parameter Set Element: 1101 AC mapping: 1686 Distributed Admission Control Offers an alternative for 164 Thomas Kuehnel, et. al.

Scope EDCF with four ACs and four queues Adjust default parameters July 2003 Scope EDCF with four ACs and four queues Adjust default parameters Create a “background” category in line with 802.1D Admission control for selected ACs Centralized mechanism (in AP) Prevents overload of queues 802.11e signaling using TSPECs Thomas Kuehnel, et. al.

EDCF Test Environment 802.11a STA 1 PHY rate 36/54 Mbps July 2003 EDCF Test Environment STA 1 802.11a PHY rate 36/54 Mbps Multiple Vendor AP/STA STA 2 AP STA 3 STA 4 Uplink RTP Traffic ( SDTV 6 Mbps) Priority Equal WiFi Test Suite STA 5 STA 6 Thomas Kuehnel, et. al.

Without Admission Control there is no QoS July 2003 Without Admission Control there is no QoS Pair 4 Starts Streaming Thomas Kuehnel, et. al.

Without Admission Control there is no QoS July 2003 Without Admission Control there is no QoS Thomas Kuehnel, et. al.

EDCA and Admission Control provides QoS July 2003 EDCA and Admission Control provides QoS Video Priority (AC default) Best Effort (default) Video Priority (AC default) Thomas Kuehnel, et. al.

Summary of Proposed Changes July 2003 Summary of Proposed Changes Reduced Size of QoS Parameters Element in Beacon to increase efficiency 44 Octets become 18 Octets (1 Octets) Add flags to QoS Parameters Element to indicate which ACs require admission control Changes to TSPEC element Add contention-access bit to TSinfo field Add new Medium Time field for response New mapping of priorities to ACs in accordance with 802.1D Bug fixes in EDCF post-backoff Normative text in in 11-3-412R1-E-Proposed-Normative-Text_for_EDCA.doc Thomas Kuehnel, et. al.