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QoS Metrics for Traffic Category/Stream. Emily H. Qi Intel Corporation. Motivation. IEEE 802.11e provides QoS for real-time traffics to meet the requirements: max latency min data rate max packet drop probability IEEE 802.11e supports EDCA and HCCA

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qos metrics for traffic category stream

QoS Metrics for Traffic Category/Stream

Emily H. Qi

Intel Corporation

Emily Qi, Intel Corporation

motivation
Motivation
  • IEEE 802.11e provides QoS for real-time traffics to meet the requirements:
    • max latency
    • min data rate
    • max packet drop probability
  • IEEE 802.11e supports
    • EDCA and HCCA
    • Prioritized QoS and parameterized QoS
  • IEEE 802.11k draft lacks the measurements or the metrics to capture QoS performance that is enhanced in 802.11e
  • Provide resolution for LB71 comment#928.

Emily Qi, Intel Corporation

proposal
Proposal
  • Provide metrics for each traffic category/stream per destination
  • Each traffic category/stream can be identified by Traffic Identifier (TID, defined in .11e)
  • For each of TID per destination, define the following metrics:
    • Transmitted frame count
    • Frame loss count
    • Accumulate transmit frame delay
    • Jitter ???
  • Define Traffic Stream Measurement Request/Response

Emily Qi, Intel Corporation

why do we need it
Why do we need it?
  • Traffic stream/category specific statistics give more accurate indication for wireless network capacity and wireless network performance in QBSS
    • stronger indication for the performance of VoIP stream and Video stream
    • A potential roaming trigger
  • Help STA to prepare next ADDTs request
  • Help AP on Admission Control and Scheduling
  • Network Diagnosis

Emily Qi, Intel Corporation

transmitted frame count
Transmitted Frame Count
  • The total number of frames that are successfully transmitted after 0 or n retries during the measurement duration for the specified traffic TID
  • Could be used for calculating frame loss rate and average delay
  • 4 octets long

Emily Qi, Intel Corporation

frame loss count
Frame Loss Count
  • The total number of frames that are discarded after given numbers of retries during the measurement duration for the specified traffic TID
  • This number will be used for calculating frame loss rate
  • 4 octets long

Emily Qi, Intel Corporation

accumulate transmit frame delay
Accumulate Transmit Frame Delay
  • The total of delay for all the transmit frames that are successfully transmitted during the measurement duration of the specified traffic TID
  • Delay is measured from the time a packet arrives to MAC layer to the time acknowledgement received
  • This number will be used for calculating average delay during the measurement duration
  • 4 octets long, in units of milliseconds

Emily Qi, Intel Corporation

jitter
Jitter ???
  • The variation of transmit frame delay
  • It is important metric for voice and video from Endpoint to Endpoint prospective.
  • But not sure it will be useful to measure delay variation between AP and STA
  • Not include Jitter in this proposal

Emily Qi, Intel Corporation

add new measurement type
Add New Measurement Type

Emily Qi, Intel Corporation

traffic stream request
Traffic Stream Request
  • TID field
    • Value 0-7 indicates the UP of prioritized QoS (TC) and TS with access policy set to EDCA
    • Value 8-15 indicates TSID for TS with access policy set to a value other than EDCA
  • Requested measuring traffic/stream is the stream that is sent from the requested STA and to the requesting STA with the specified Traffic ID (TID)

Emily Qi, Intel Corporation

traffic stream measurement report
Traffic Stream Measurement Report

Emily Qi, Intel Corporation

feedback
Feedback?

Emily Qi, Intel Corporation