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802.11 Modeling Observations. Authors:. Bob Miller AT&T Labs - Research 180 Park Avenue Florham Park, NJ 07932 973-236-6920 [email protected] Matthew Sherman AT&T Labs - Research 180 Park Avenue Florham Park, NJ 07932 973-236-6791 [email protected] Date: November 9, 2000.

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802 11 modeling observations

802.11 Modeling Observations

Authors:

Bob Miller

AT&T Labs - Research

180 Park Avenue

Florham Park, NJ 07932

973-236-6920

[email protected]

Matthew Sherman

AT&T Labs - Research

180 Park Avenue

Florham Park, NJ 07932

973-236-6791

[email protected]

Date: November 9, 2000

Matthew Sherman, AT&T Labs - Research


Model results some observations
Model Results - Some Observations

  • The model demonstrates only availability of a tool for evaluating E-MAC performance

  • Is not meant to demonstrate efficacy of any particular MAC (yet)

  • Shows why “Native” PCF can be effective in QoS applications compared to “Native” DCF

Matthew Sherman, AT&T Labs - Research


Model use for optimization comparison
Model Use for Optimization / Comparison

  • Needs added sophistication, e.g. TCP/IP, which lowers throughput, impacts streams differently

  • Needs to be validated e.g. with another model and/or operating hardware data, if possible (current model throughputs are not realistic)

  • “Efficient QoS”, not just “QoS”, with many users, many media types, many protocols should be goal--- need scenarios which differentiate “Basic PCF” from “QoS PCF”

Matthew Sherman, AT&T Labs - Research


Adopted qos req ts from ieee 802 11 00245r1
Adopted QoS Req’ts from IEEE 802.11-00245r1

  • 3. QoS Requirements

    • 3.1. Corrections and enhancements to the PCF that may be required to best meet QoS performance objectives must be incorporated.

    • 3.2. Differential handling of MSDUs supplied to the MAC with additional priorities and classes of service.

    • 3.3. Bounded delay, prioritized acess, and bounded latency per MDSU (allocatable services), power management bypass mechanisms (which has priority in iBSS and BSS may need a mechanism for separable handsets).

    • 3.4. MAC SAP support for 802.1D/802.1q.

    • 3.5. Support for multiple simultaneous streams with differing priority and class requirements.

    • 3.6. Transmit Power Control.

    • 3.7. To provide the hooks in the MAC to obtain remote channel information.

Matthew Sherman, AT&T Labs - Research


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