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Signaling Acceptable Error Rate in TSPEC

Signaling Acceptable Error Rate in TSPEC. Amjad Soomro, Kiran Challapali, Javier Del Prado, Zhun Zhong Philips. Comment Addressed. 931. Current Traffic Specification (TSPEC). These parameters are passed from Higher Layers to MAC

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Signaling Acceptable Error Rate in TSPEC

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  1. Signaling Acceptable Error Rate in TSPEC Amjad Soomro, Kiran Challapali, Javier Del Prado, Zhun Zhong Philips Soomro et. al., Philips

  2. Comment Addressed • 931 Soomro et. al., Philips

  3. Current Traffic Specification (TSPEC) • These parameters are passed from Higher Layers to MAC • Except “Minimum PHY Rate” and “Surplus Bandwidth Allowance” which may be calculated by MAC • Mandatory Parameters (shall be specified by non-AP QSTA during TSPEC negotiation) • Nominal MSDU Size • Max Service Interval or Delay Bound • Mean Data Rate Soomro et. al., Philips

  4. Issues with current TSPEC • Packet errors exist on the wireless medium (and at the PHY SAP) • Some errors mitigated via retries (accounted for in surplus bandwidth allowance) • However, residual error remain at MAC SAP • Due to bursty errors on WLAN • Especially severe for low delay applications • Given that residual errors exist, how does the AP decide when to delete a TSPEC? Soomro et. al., Philips

  5. Example error tolerance for different applications • Some applications are tolerant of errors • Example: • Video in general, scalable video in particular, can tolerate high error rates • Audio (VoWLAN) can tolerate some errors • However, medical applications have very low error tolerance • (HDTV can tolerate 2 packets/second • http://www.atsc.org/Standards Document is: a/64) Soomro et. al., Philips

  6. Audio/Video Residual error VoIP IT Patient Monitoring Delay Delay versus loss tolerance Soomro et. al., Philips

  7. The proposal • Applications can optionally specify the amount of errors they can tolerate • We propose to include in TSPEC the field Maximum Tolerable Error Rate • Definition: Unless the residual error rate for a flow exceeds Maximum Tolerable Error Rate the AP should not delete the TSPEC • QoS for 3G has a similar field Soomro et. al., Philips

  8. Advantages of the Proposal • QAP/QSTA knows when not to delete a TSPEC • For the QAP/QSTA to know if the QoS is met. • How to make delay versus loss tradeoffs… • In addition it could help figuring out max_retry_limit? Soomro et. al., Philips

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