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

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

3. 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.

4. 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.

5. 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.

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

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

8. 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.

9. 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 R1-E-Proposed-Normative-Text_for_EDCA.doc
Thomas Kuehnel, et. al.