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IEEE 802.11 Quality of Service

IEEE 802.11 Quality of Service. Arun Ayyagari, Yoram Bernet, Tim Moore Microsoft Corporation aruna@microsoft.com, yoramb@microsoft.com, t immoore@microsoft.com. Overview. QoS guarantees for real-time application data traffic is currently not available in IEEE 802.11

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IEEE 802.11 Quality of Service

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  1. IEEE 802.11 Quality of Service Arun Ayyagari, Yoram Bernet, Tim Moore Microsoft Corporation aruna@microsoft.com, yoramb@microsoft.com, timmoore@microsoft.com A. Ayyagari, et. al., Microsoft Corp.

  2. Overview • QoS guarantees for real-time application data traffic is currently not available in IEEE 802.11 • Bandwidth guarantees at MAC level is not required • Propose using prioritised data with resource based admission control as the means to provide QoS guarantee for IEEE 802.11 A. Ayyagari, et. al., Microsoft Corp.

  3. 802.1p • 802.1p supports prioritization of traffic on Ethernet • Ethernet tag containing 0-7 levels of priority • Requires queues at points of congestion • Number of queues is implementation dependent • Guarantee bandwidth by using admission control to limit traffic sent on each priority level • IETF defines how to use SBM with 802.1p A. Ayyagari, et. al., Microsoft Corp.

  4. Resource Based Admission • Subnet bandwidth manager does admission control so priority levels not overrun • SBM extends RSVP to level 2 networks • Designated SBM (DSBM) acts as the admission control agent • Should be located at the point that knows most about the resources available • Resource reservation protocol (RSVP) signalling goes end-to-end in case any part of the network is interested. • SBM and 802.11 • DSBM functionality should be co-located with the Access Point for optimal admission control • Roaming • Renewal of request every 30 seconds • Client allowed to send a renewal if it believes it is required • E.g. Re-association • Roam to an access point with no resources left • Renew of request fails • Priority of requests supported A. Ayyagari, et. al., Microsoft Corp.

  5. 802.1p and 802.11 • Access point should support 802.1p • Sending onto the wire • Sending onto the wireless • Clients should support 802.1p • Modify DCF method • Modify the minimum and maximum values of the Contention Window parameter to ensure that higher priority frames have statistically a greater probability of transmission over lower priority frames. A. Ayyagari, et. al., Microsoft Corp.

  6. Ad-hoc • 802.1p priority works station to station • Each station needs to implement admission control for the wireless interface A. Ayyagari, et. al., Microsoft Corp.

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