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Definitions and Terminology from 802.11.2

Definitions and Terminology from 802.11.2. Authors:. Date: 2011-03-16. Abstract. This presentation lists terminology possibly relating to definitions currently drafted within the scope of TGai . BSS Transition Time. Metric defined in 802.11.2, §6.7 Purpose:

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Definitions and Terminology from 802.11.2

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  1. Definitions and Terminology from 802.11.2 Authors: Date: 2011-03-16 Marc Emmelmann, Fraunhofer FOKUS

  2. Abstract This presentation lists terminology possibly relating to definitions currently drafted within the scope of TGai. Marc Emmelmann, Fraunhofer FOKUS

  3. BSS Transition Time • Metric defined in 802.11.2, §6.7 • Purpose: • characterize the time it takes for an IEEE 802.11 non-AP STA to change its network connectivity from one IEEE 802.11 AP to another. The process is formally called BSS transition, or simply “roaming” (at Layer 2 of the ISO protocol hierarchy) • Definition: • For the purposes of this metric, the BSS transition time is defined as the time interval starting after the trans- mission of the last acknowledged data frame sent within an originating BSS and ending after the transmis- sion of the first acknowledged data frame sent within the destination BSS. This interval includes BSS transition activities such as authentication, (re)association and QoS negotiation. The two BSSs should be in the same ESS. This definition of BSS transition time encompasses both uplink and downlink data frames. • NOTE—The BSS transition time metric characterizes the link layer portion of the transition only, since some of the frames sent during a transition may be part of a higher layer protocol. • Related to xxx4 Term („Link Set-Up Latency“) Marc Emmelmann, Fraunhofer FOKUS

  4. Non-AP STA association rate • Metric as defined in 802.11.2 §6.13 • Purpose: • This metric determines the rate at which a DUT can perform the authentication and association functions specified by the IEEE Std 802.11 protocol, including where applicable the RSNA authentication and key management (AKM) functions. This metric is only applicable to Aps. • The test measures the time taken for a wireless LAN to recover from faults and transient conditions, such as an AP being reset, a group of non-AP STAs being turned on concurrently, or a group of non-AP STAsmoving from one AP to another. It is of particular significance when dealing with Voice over IP (VoIP) terminals in an IEEE 802.11 LAN, where call setup times may be adversely affected by long authentication and association delays. • Related to xxx1 („Link attempt rate“) Marc Emmelmann, Fraunhofer FOKUS

  5. References • P802.11.2/D1.1 – Recommended Practice for the Evaluation of 802.11 Wireless Performance • 11-11/408r0: Use Case Characteristics Discussion Marc Emmelmann, Fraunhofer FOKUS

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