Power Consumption Measurement doc.: IEEE 802.11-06/0008r1 January 2006 Power Consumption Measurement Date: January, 2006 Authors: Notice: This document has been prepared to assist IEEE 802.11. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE 802.11. Patent Policy and Procedures: The contributor is familiar with the IEEE 802 Patent Policy and Procedures <http:// ieee802.org/guides/bylaws/sb-bylaws.pdf>, including the statement "IEEE standards may include the known use of patent(s), including patent applications, provided the IEEE receives assurance from the patent holder or applicant with respect to patents essential for compliance with both mandatory and optional portions of the standard." Early disclosure to the Working Group of patent information that might be relevant to the standard is essential to reduce the possibility for delays in the development process and increase the likelihood that the draft publication will be approved for publication. Please notify the Chair <stuart.kerry@philips.com> as early as possible, in written or electronic form, if patented technology (or technology under patent application) might be incorporated into a draft standard being developed within the IEEE 802.11 Working Group. If you have questions, contact the IEEE Patent Committee Administrator at <patcom@ieee.org>. Alexander Tolpin, Intel Alexander Tolpin, Intel

doc.: IEEE 802.11-06/0008r1 January 2006 Abstract This document introduces the description of Power Consumption Measurement methodology and metric for performance testing of 802.11 wireless LAN devices. This presentations corresponds to the document 11-06-0007-00-000t-Power-Consumption-Measurement-Proposal-Text.doc. Alexander Tolpin, Intel Alexander Tolpin, Intel

Summary Purpose Measurement Setup Operation States doc.: IEEE 802.11-06/0008r1 January 2006 Summary Purpose Measurement Setup Operation States Measurement procedure Example of measurement results Conclusion Alexander Tolpin, Intel Alexander Tolpin, Intel

January 2006 Purpose The basic measure of the average amount of a power that WLAN NIC consumes from the power supplier or the battery in different operation states. This test is applicable to an infrastructure BSS client configurations as well as to standalone clients. This is primary metric since impacts the end user experience such as battery life time. Alexander Tolpin, Intel

January 2006 Test Setup The setup for the measurement should be performed on one of two setups already defined in TGT draft [4] for throughput measurement. The first is “Throughput versus attenuation in a conducted environment” described in [4] section 6.2. In this case the attenuation should be set in order to achieve the maximal TPT. The second is the ”Throughput versus range in an OTA environment” already described in [4] section 6.6. In this case the range and orientation should be selected to achieve the maximal TPT, and the rotation of DUT should be omitted. In both cases the entire system is suitably isolated from external interference and other unwanted signals. Traffic Generator and Analyzer is used to measure TPT during the test and make sure the target TT is achieved. The Digital Oscilloscope is used to measure voltage and average current in order to calculate average power consumption. if DUT has more than one consuming line, each line shall be measured separately each consuming line should be extended to allow connection of voltage and current probe The Test Controller is connected to DUT, WLCP and Digital Oscilloscope for Traffic generation and TPT measurement Control of measurement of voltage, current and power consumption. Alexander Tolpin, Intel

Power Consumption Measurement setup January 2006 Power Consumption Measurement setup Alexander Tolpin, Intel

Scheme of connection of voltage and current probes January 2006 Scheme of connection of voltage and current probes Alexander Tolpin, Intel

Operation States List Device Disabled. Idle unassociated. January 2006 Operation States List Device Disabled. Idle unassociated. Idle associated. Wireless Disabled Data Transfer RX Data Transfer TX Alexander Tolpin, Intel

Operation States Definition January 2006 Operation States Definition Device Disabled. DUT is plugged in and installed on the platform but disabled by device manager. Idle Unassociated. DUT is enabled but it is not associated to any BSS or IBSS. Represents the use case where DUT is turned on but so far there are no desired APs around. Depends on how often and how long DUT performs scanning Idle Associated. DUT is associated to AP but there is no data exchange between AP and DUT except required management frames. Represents the use case where a DUT is connected to an AP but not actively doing anything other then staying associated and ready to exchange data. Alexander Tolpin, Intel

Operation States Definition (cont.) January 2006 Operation States Definition (cont.) Wireless Disabled. DUT was already active and associated with AP but the radio of DUT currently is disabled. Represents the use case where radio is turned OFF on the platform by GUI or special switch (a.k.a. HW RF-Kill) HW RF-Kill isn’t always supported by platforms Need to make sure this mode is supported and enabled. Data Transfer RX. DUT is associated to AP and mostly busy with receiving data Represents the use case where DUT is fully loaded by running downstream at highest rate per band (54Mbps .11a/g & 11Mbps .11b) Data Transfer TX. DUT is associated to AP and mostly busy with transmitting data Represents the use case where DUT is fully loaded by running upstream at highest rate per band (54Mbps .11a/g & 11Mbps .11b) Alexander Tolpin, Intel

Measurement Procedure January 2006 Measurement Procedure The measurement procedure depends on the operation state; in general it looks as follows: Set up DUT according to base configuration using initial test parameters with the best attenuation or the best range Move DUT to the desired operation state Generate the appropriate traffic if required; measure and report TPT Measure voltage (V) simultaneously for each consumption line Measure average current (I) simultaneously for each consumption line by the digital oscilloscope during 100Sec Calculate the average power consumption as P=V*I for each consumption line separately Combine results and report. Alexander Tolpin, Intel

Example of current loops for 1.5V, 3.3V Main, and 3.3V AUX January 2006 Example of current loops for 1.5V, 3.3V Main, and 3.3V AUX Alexander Tolpin, Intel

Example of attachment of current probes to measure current and voltage January 2006 Example of attachment of current probes to measure current and voltage Alexander Tolpin, Intel

doc.: IEEE 802.11-06/0008r1 January 2006 Example of Power Consumption measurement results for different NICs in W State Band TPT achieved (MBps) NIC A (W) NIC B (W) NIC C (W) NIC D (W) Device Disabled   0.033 0.623 0.362 0.026 Idle Associated 0.070 0.810 0.354 0.073 Idle Not Associated 0.052 0.769 0.806 0.041 Wireless Disabled 0.035 0.027 Data Transfer Tx 11a 21 1.217 1.630 1.150 1.237 11g 1.117 1.705 0.960 1.086 11b 6 1.300 1.690 1.195 1.050 Data Transfer Rx 1.115 1.514 1.082 1.080 1.550 0.841 0.967 1.100 1.465 0.853 0.950 Alexander Tolpin, Intel Alexander Tolpin, Intel

January 2006 Example of the chart of Power Consumption measurement results for different NICs in W Alexander Tolpin, Intel

Conclusion The Power Consumption Measurement has been proposed January 2006 Conclusion The Power Consumption Measurement has been proposed The proposal contains: Purpose of the measurement Descriptions of equipment and test setup Description of operation states Baseline, modifiers and test parameters Calibration and precision requirements Measurement Procedures Reporting results requirements Example Recommendation: Recommend TGT to adopt the content of document 11-06/0007r0 into the P802.11.2 draft. Alexander Tolpin, Intel