March 2005 doc.: IEEE 802.11-05/0206r0
IEEE P802.11
Wireless LANs
Date: 2005-03-14
Author(s):
Name / Company / Address / Phone / email
Steve Shellhammer / Intel / 13290 Evening Creek Drive
San Diego, CA 92128 / (858) 391-4570 /
Uriel Lemberger / Intel / PO Box 1659, Matam Industrial Park, Haifa 31015 Israel / +972-4-865-5701 /
Sasha Tolpin / Intel / PO Box 1659, Matam Industrial Park, Haifa 31015 Israel / +972-4-865-5430 /
Neeraj Sharma / Intel / 13290 Evening Creek Drive
San Diego, CA 92128 / (858) 385-4112 /
Nir Alon / Intel / PO Box 1659, Matam Industrial Park, Haifa 31015 Israel / +972-4-865-6621 /
Pratik Mehta / Dell / One Dell Way,
Round Rock, TX 78682 / 512-338-4400 /
Fahd Pirzada / Dell / One Dell Way,
Round Rock, TX 78682 / 512-338-4400 /
Michael Foegelle / ETS-Lindgren, L.P. / 1301 Arrow Point Drive
Cedar Park, TX 78758 / (512) 531-6444 /
Amer Hassan / Microsoft / One Msft Way
Richmond, WA 98052 / (425)-705-9590 /
Thomas Kuehnel / Microsoft / One Msft Way
Richmond, WA 98052 / (425)-706-4351 /
Sachin Goel / University of New Hampshire / 121 Technology Drive, Suite 2,
Durham, NH -03824 / 603.781.7960 /
Revision History
Rev / Date / Author / Description0 / March 14, 2005 / Steve Shellhammer / Initial Draft. Included definitions developed by TGT Ad Hoc Committee
Instructions to Editor: Add this material to the definitions clause. Note, these are not in alphabetical order; they are in more of a logical order for the purpose of discussion. Please put in alphabetical order in the draft Recommended Practice.
1 Definitions
1.1 Metric: A system of related measures that facilitate the quantification of particular characteristic.
1.2 Primary metric: A metric that directly affects the user experience.
1.3 Secondary metric: A metric that directly affects a primary metric.
1.4 Application layer metric: A metric that measures performance at the application layer of a wireless local area network.
1.5 MAC layer metric: A metric that measures performance at the MAC layer of a wireless local area network.
1.6 PHY layer metric: A metric that measures performance at the PHY layer of a wireless local area network.
1.7 Correlation: The relationship between two or more values of metrics such that systematic changes in one are accompanied by systematic changes in the others. These metrics may be primary or secondary.
1.8 Inference: An estimate of the value of a metric given the values of one or more other metrics. These metrics may be primary or secondary.
1.9 Repeatable in time: The property of a test such that the test can be performed at different times and the results from the tests performed at these different times agree, to within the specified precision of the test.
1.10 Repeatable in location: The property of test that such that the test can be performed in different locations and the results from the tests performed at different locations agree, to within the specified precision of the test.
1.11 Traffic: A representation of the information flowing over the wireless local area network.
1.12 Data traffic: Traffic representing the exchange of non-QoS data between two stations in a wireless local area network. This model does not represent traffic from applications with specific QoS requirements, like voice or video.
1.13 Latency sensitive traffic: Traffic that represents the exchange of latency sensitive data between two stations in a wireless local area network.
1.14 Streaming traffic: Traffic that represents the delivery of streaming media from one station to another station in the wireless local area network.
1.15 Usage Cases: The scenarios (e.g. data oriented, streaming media, latency-sensitive) used to represent the end-user experience when using WLAN devices.
1.16 Data Usage Case: The usage case representing the flow of data traffic that is not time-critical.
1.17 Streaming Media Usage Case: The usage case representing the flow of streaming traffic such as audio and video.
1.18 Latency-Sensitive Usage Case: The usage case representing the flow of latency-sensitive traffic such as voice conversations.
1.19 Canonical set of primary metrics: For a given usage case, this is the minimum set of primary metrics that can be used to effectively infer the user experience.
1.20 Environment: The circumstances or conditions that surround one; surroundings.
1.21 Test environment: The set of external physical circumstances and conditions surrounding or influencing the wireless performance of the 802.11 device under test.
1.22 Controlled test environment: Any test environment where the circumstances and conditions surrounding or influencing the DUT are controlled to provide a known level of uncertainty.
1.23 Conducted test environment: A test environment where RF test signals are directly injected into and received from the radio of the device under test using a cable.
1.24 Isolated conducted test environment: A conducted test environment in which all external signals reaching the DUT at a level sufficient to affect the test result propagate through the cable and not over the air.
1.25 Over-the-air (OTA) testenvironment: Atest environmentin which the RF test signals propagate to and from the antenna of the device under test. In addition the RF test signals are conducted between the antenna and the radio of the device under test.
1.26 Shielded enclosure: Ashielded box, screen room, or chamber used to isolate atest environment from outside RF signals.
1.27 RF test signal: An RF signal introduced to the DUT/SUT for the purpose of testing its performance under a given set of conditions.
1.28 Communication test signal: An RF Test signal carrying the communication payload to or from the DUT or SUT.
1.29 Interference testsignal:AnRF Test signalintroduced or present at the DUT/SUT producing known levels and types of interference with the communication test signal.
1.30 Internal interference signals:Platform noise or other similar signals that are internal to the DUT/SUT rather than externally applied as part of the test. This does not include thermal noise.
1.31 Extraneoussignal:Any signal external to the test setup
1.32 Line of site (LOS) channel: A channel between two devices in which there is an unobstructed path between the two devices. This channel is usually modelled using Ricean statistics
1.33 Non-line of site (NLOS) channel: A channel between two devices in which there is not an unobstructed path between the two devices. This channel is usually modelled using Rayleigh statistics.
1.34 Indoor test environment: An over-the-air test environment representing indoor usage of the WLAN
1.35 Outdoor test environment: An over-the-air test environment representing outdoor usage of the WLAN
1.36 Indoor LOS test environment: An indoor test environment with a LOS channel between the device under test and the device emitting the RF test signal
1.37 Indoor NLOS test environment: An indoor test environment with a NLOS channel between the device under test and the device emitting the RF test signal
1.38 Outdoor LOS test environment: An outdoor test environment with a LOS channel between the device under test and the device emitting the RF test signal (Not sure if this is necessary since I believe all outdoor test environments will be LOS)
1.39 Correlation in different environments: The correlation between values of the same metric measured or inferred in different test environments; for example correlating between the values measured in the conducted environment and the LOS environment.
1.40 Correlation in same environment: The correlation between values of different metrics to establish the effect one metric on other metrics in the same test environment.
1.41 Model: A description of an observed behaviour, refined by using specific assumptions that can be used to establish the correlation or inference between two or more metrics.
Instructions to Editor: Add this material to the abbreviations and acronyms clause. Note, these are not in alphabetical order; they are in more of a logical order for the purpose of discussion. Please put in alphabetical order in the draft Recommended Practice.
2 Abbreviations and Acronyms
CON / ConductedOTA / Over the air
LOS / Line of site
NLOS / Non line of site
QoS / Quality of Service
VoIP / Voice over Internet Protocol
PHY / Physical layer
MAC / Medium Access Control sub-layer
DUT / Device under test
SUT / System under test
VoW / Video over wireless
TGT Definitions and Acronyms page 6 Steve Shellhammer, Intel