1. QoS Metrics Date:2005-01-12 Authors: January 2005 Month Year
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Emily Qi, Intel Corporation
Emily Qi, Intel Corporation

2. Month Year
January 2005
January 2005
Abstract
This submission contains a proposal to add Quality of Service (QoS) and Quality of Signal (QoS) metrics to the latest TGk draft. The proposed QoS metrics include Transmit frame count, Frame loss count, Retransmission Count, Average Transmit delay, Minimum transmit delay, and Maximum transmit delay. This contribution provides resolution for LB71 comment#928, #933, etc..
Emily Qi, Intel Corporation
Emily Qi, Intel Corporation

3. Month Year
January 2005
January 2005
Motivation
VoIP and Video/Audio stream become prominent applications in WiFi
IEEE e provides QoS for real-time traffics to meet the requirements:
max latency
min data rate
max packet drop probability
IEEE k draft lacks the measurements to capture Quality of Service and Quality of Signal (QoS²) performance.
Provide resolution for LB71 comment#928, #933, etc.
Emily Qi, Intel Corporation
Emily Qi, Intel Corporation

4. Proposal Define QoS metrics as a new measurement type
Month Year
January 2005
January 2005
Proposal
Define QoS metrics as a new measurement type
QoS metrics include:
Transmit frame count (MSDU)
Frame loss count (MSDU)
Retransmission count (MSDU)
Latency: Average transmit delay
Jitter: Min transmit delay and Max transmit delay
QoS metrics is per traffic category/stream (TID) for QSTA or for all traffics for non-QSTA
QoS metrics is per link - per destination
The requesting STA and reporting STA could be a QSTA or non-QSTA
Emily Qi, Intel Corporation
Emily Qi, Intel Corporation

5. Add New Measurement Type
Month Year
January 2005
January 2005
Add New Measurement Type
Measurement Name
Measurement Type
Unused
0-2
Channel Load Request 3
Noise Histogram Request 4
Beacon Request 5
Frame Request 6
Hidden Node Request 7
Medium Sensing Time Histogram Request 8
STA Statistics Request 9
QoS Metrics Request 10
Reserved
11-255
Emily Qi, Intel Corporation
Emily Qi, Intel Corporation

6. Randomization Interval Traffic Identifier (TID)
Month Year
January 2005
January 2005
QoS Metrics Request
Randomization Interval
Measurement Duration
Destination Address
Traffic Identifier (TID)
Octets: 2 6 1
Destination Address contains the 6-byte MAC address of the intermediate destination of the measuring traffics.
The measuring traffic is the stream that sent from the measuring STA to the STA with specified destination address
TID field
Value 0-7 indicate the UP of prioritized QoS (TC) and TS with access policy set to EDCA
Value 8-15 indicate TSID for TS with access policy set to a value other than EDCA
Value 255 indicates the QoS metrics will be measured all of traffics, - allow both QSTA and non-QSTA to have QoS metrics request
Value are reserved values
Emily Qi, Intel Corporation
Emily Qi, Intel Corporation

7. QoS Metrics Report January 2005 Fields Octets
Month Year
January 2005
January 2005
QoS Metrics Report
Fields
Octets
Actual Measurement Start time 8
Measurement Duration 2
Destination Address 6
TID 1
Transmit Frame Count 4
Frame Loss Count
Retransmission Count
Average Transmit Delay
Minimum Transmit Delay
Maximum Transmit Delay
Emily Qi, Intel Corporation
Emily Qi, Intel Corporation

8. Transmit Frame (MSDU) Count
Month Year
January 2005
January 2005
Transmit Frame (MSDU) Count
Definition: The total number of MSDU which are successfully transmitted after 0 or n reties during the measurement duration for the specified destination and the specified TID
Usages: An indication of traffic capacity and be used for calculating frame loss rate
4 octets long
Emily Qi, Intel Corporation
Emily Qi, Intel Corporation

9. Month Year
January 2005
January 2005
Frame Loss Count
Definition: The total number of MSDU which are discarded after given numbers of retries, or when MSDU timer is expired, during the measurement duration for the specified destination and the specified TID
Usages: An indication of link quality and voice/video stream quality
4 octets long
Emily Qi, Intel Corporation
Emily Qi, Intel Corporation

10. Retransmission Count (MSDU)
Month Year
January 2005
January 2005
Retransmission Count (MSDU)
Definition: The total number of retries for successfully transmitted frames (MSDU) and discarded frames (MDSU) during the measurement duration for the specified destination and the specified TID
Usages: An indication of link quality
4 octets long
Emily Qi, Intel Corporation
Emily Qi, Intel Corporation

11. Transmit Frame Delay Definition:
Month Year
January 2005
January 2005
Transmit Frame Delay
Definition:
Delay is measured from the time MPDU is contending for medium to the start of successful transmission attempt.
Measure Average, Min, and Max delay of MPDUs that are successfully transmitted during the measurement duration for the specified destination and the specified TID.
Usages: indications of voice/video stream quality (latency and Jitter), and help AP on admission control and Scheduling.
4 octets long, in units of milliseconds
Emily Qi, Intel Corporation
Emily Qi, Intel Corporation

12. Month Year
January 2005
January 2005
Why Per TID?
For QSTAs, different Traffic Streaming and Traffic Category have different priority which may experience a different delay
For QSTAs, Different TC and TS have the different requirements with frame loss rate and retransmission rate.
For non-QSTAs, QoS metrics will be measured over all of traffics with specified destination address
Emily Qi, Intel Corporation
Emily Qi, Intel Corporation

13. Month Year
January 2005
January 2005
Normative Text
k-proposed-normative-text-qos-metrics.doc
Emily Qi, Intel Corporation
Emily Qi, Intel Corporation

14. References 11-04-1204-02-000k-QoS-Statistics.ppt
January 2005
References
k-QoS-Statistics.ppt
k-qos-statistics-normative-text.doc
Emily Qi, Intel Corporation

15. January 2005
Feedback?
Emily Qi, Intel Corporation