Compliance Summary Report

Microsoft Corporation 2085 Portable Computing Device C3K2085 C3K2085 2085

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ELEMENT MATERIALS TECHNOLOGY
(formerly PCTEST) 7185 Oakland Mills Road, Columbia, MD 21046 USA
Tel. +1.410.290.6652 / Fax +1.410.290.6654 http://www.element.com
COMPLIANCE SUMMARY REPORT

Applicant Name:
Microsoft Corporation
One Microsoft Way Redmond, WA 98052 USA Microsoft Corporation

Test Site/Location: Element Washington DC LLC, Columbia, MD, USA Document Serial No.:
1M2311170118-02.C3K

FCC ID:

C3K2085

APPLICANT:
Report Type: DUT Type: Model:

MICROSOFT CORPORATION
Compliance Summary Portable Computing Device 2085

EAR-Controlled Data: This document contains technical data whose export and reexport/ retransfer may be subject to control by the U.S. Department of Commerce under the Export Administration Act and the Export Administration Regulations. The Department of Commerce's prior written approval may be required for the export or re-export/retransfer of such technical data to any foreign person, foreign entity or foreign organization whether in the United States or abroad.

FCC ID: C3K2085

COMPLIANCE SUMMARY REPORT

Approved by: Technical Manager

Document S/N: 1M2311170118-02.C3K

DUT Type: Portable Computing Device

Page 1 of 10

REV 1.1 04/11/2022 Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from Element. If you have any questions or have an enquiry about obtaining additional rights to this report or assembly of contents thereof, please contact [email protected].

TABLE OF CONTENTS

1 STRATEGY FOR COMPLIANCE DEMONSTRATION

3

1.1 RF Exposure Evaluation Strategy

3

1.2 Nomenclature

4

1.3 Bibliography

4

2 TIME AVERAGING ALGORITHM

5

2.1 Algorithm Description

5

2.2 Basic concept of the algorithm

6

2.3 Configurable Parameters

8

3 DUT DESCRIPTION

9

3.1 Device Overview

9

4 COMPLIANCE SUMMARY

10

4.1 RF Exposure Compliance Summary

10

FCC ID: C3K2085

COMPLIANCE SUMMARY REPORT

Approved by: Technical Manager

Document S/N: 1M2311170118-02.C3K

DUT Type: Portable Computing Device

Page 2 of 10

REV 1.1 04/11/2022 Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from Element. If you have any questions or have an enquiry about obtaining additional rights to this report or assembly of contents thereof, please contact [email protected].

1

STRATEGY FOR COMPLIANCE DEMONSTRATION

1.1 RF Exposure Evaluation Strategy

The FCC RF exposure limits defined based on time-averaged RF exposure. The device under test (DUT) uses the

Qualcomm FastConnect feature to control and manage transmitting power in real time and to ensure at all times

the time-averaged RF exposure is in compliance with the FCC requirement via FastConnect TAS for WLAN

operations. Additionally, this device supports BT/NFC technologies but the output power of these modems is not

controlled

by

the

TAS

algorithm.

Demonstrating compliance of DUT enabled with Qualcomm FastConnect feature is completed in three parts:

0. RF Exposure Compliance Test Report Part 0: SAR Characterization
The SAR Characterization, denoted as SAR Char, determines the power limit that meets FCC exposure requirement after accounting for device design related uncertainties for each supported radio configuration and RF exposure usage scenario. The determined power limits will be loaded and stored in the EUT via the Board Data File (BDF), and then used as inputs for TAS to operate.
For WLAN SAR Char is derived from SAR test measurements and conducted power measurements to determine PLimit for each technology/band. The PLimit represents the maximum time-averaged power level for the corresponding radio/antenna configuration.
1. RF Exposure Compliance Test Report Part 1: Test in Static Transmission Condition
Part 1 demonstrates that DUT meets FCC SAR limits when transmitting at pre-determined maximum time-averaged power level: PLimit for WLAN. The SAR measurement in Part 1 is under static transmission condition.
The compliance for BT radio is demonstrated at a fixed power level (fixed = maximum RF tune-up level or power-back off level).
The exposure from the simultaneous transmission of WLAN is evaluated in Part 2 report.
2. RF Exposure Compliance Test Report Part 2: Test in Dynamic Transmission Condition
Part 2 demonstrates compliance in Tx varying transmission conditions and validates Qualcomm FastConnect algorithm. The test results reported in Part 2 demonstrates that DUT complies with FCC RF exposure requirement under Tx varying transmission scenarios, thereby validity of Qualcomm FastConnect algorithm.

FCC ID: C3K2085

COMPLIANCE SUMMARY REPORT

Approved by: Technical Manager

Document S/N: 1M2311170118-02.C3K

DUT Type: Portable Computing Device

Page 3 of 10

REV 1.1 04/11/2022 Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from Element. If you have any questions or have an enquiry about obtaining additional rights to this report or assembly of contents thereof, please contact [email protected].

1.2 Nomenclature

Applicable Technologies
PLimit

Term

WLAN WLAN

PMax TSAR SAR_design_target
SAR Char regulatory body
Reserve margin Preserve

Description
Power level that corresponds to the exposure design target (SAR_design_target) after accounting for all device design related uncertainties Maximum tune up output power Defined time averaging window for f < 6 GHz Target SAR level resulting in maximum time-averaged exposure optimized from total uncertainty Table containing Plimit for all technologies Regulatory body that the algorithm is designed to comply. Algorithm's time averaging window is dependent on either FCC or ICNIRP requirements. Margin below PLimit reserved for future transmission Minimum transmit power with a designated margin below PLimit

1.3 Bibliography

Report Type
SAR Evaluation Report (Part 1) SAR Evaluation Report (Part 0) RF Exposure Part 2 Test Report

Report Serial Number
1M2311170118-01.C3K 1M2311170118-21.C3K 1M2311170118-22.C3K

FCC ID: C3K2085

COMPLIANCE SUMMARY REPORT

Approved by: Technical Manager

Document S/N: 1M2311170118-02.C3K

DUT Type: Portable Computing Device

Page 4 of 10

REV 1.1 04/11/2022 Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from Element. If you have any questions or have an enquiry about obtaining additional rights to this report or assembly of contents thereof, please contact [email protected].

2

TIME AVERAGING ALGORITHM

2.1 Algorithm Description

The FCC RF exposure limit is defined based on time-averaged RF exposure. When running in a wireless device, Qualcomm FastConnect algorithm enables more elegant power control mechanisms for RF exposure management. It ensures at all times the wireless device is in compliance with the FCC limit of RF exposure time-averaged over a
defined time window, denoted as TSAR and TPD for specific absorption rate (SAR for transmit frequency < 6 GHz)
and power density (PD for transmit frequency > 6 GHz) time windows, respectively.
The Qualcomm FastConnect algorithm not only ensures the wireless device complies with RF exposure requirement, but also improves the user experience and network performance.
For a given wireless device, RF exposure is proportional to the transmitting power.
· Once the SAR of the wireless device is characterized at a transmit power level, RF exposure at a different power level for the characterized configurations can be scaled by the change in the corresponding power level.
· Therefore, for a characterized device, RF exposure compliance can be achieved through transmit power control and management.
The Qualcomm FastConnect algorithm embedded in Qualcomm modems reliably controls the transmit power of the wireless device in real time to maintain the time-averaged transmit power, in turn, time-averaged RF exposure, below the predefined time-averaged power limit for each characterized technology and band.
· This predefined time-averaged power limit is denoted as PLimit corresponding SAR limit (frequency < 6 GHz) in this report.
· The wireless device continuously transmitting at PLimit level complies with the FCC RF exposure requirement.
In a simultaneous transmission scenario, the algorithm manages all active transmitters and make sure the total exposure ratio from each transmitter not exceeding to 1.

FCC ID: C3K2085

COMPLIANCE SUMMARY REPORT

Approved by: Technical Manager

Document S/N: 1M2311170118-02.C3K

DUT Type: Portable Computing Device

Page 5 of 10

REV 1.1 04/11/2022 Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from Element. If you have any questions or have an enquiry about obtaining additional rights to this report or assembly of contents thereof, please contact [email protected].

2.2 Basic concept of the algorithm

The Qualcomm FastConnect algorithm controls and manages the instantaneous transmit power (Tx) to maintain the time-averaged Tx power and therefore, time-averaged RF exposure in compliance with FCC limits.
 If time-averaged transmit power approaches PLimit, then the modem needs to limit instantaneous transmit power to ensure the time-averaged transmit power does not exceed PLimit in any TSAR time windows since the time-averaged RF exposure is required to comply with the FCC RF exposure limit in any TSAR time window.
 The wireless device can instantaneously transmit at high transmit powers and exceed the PLimit level for a short duration before limiting the power to maintain the time-averaged transmit power under PLimit.
 If the wireless device transmits at high power for a long time, then the radio link needs to be dropped to be compliant with time-averaged Tx power requirement (see Figure 2-1).
 To avoid dropping the radio link, TAS algorithm starts the power limiting enforcement earlier in time to back off the Tx power to a reserve level (denoted as Preserve), so the wireless device can maintain the radio link at a minimum reserve power level for as long as needed, and at the same time ensure the time-averaged Tx power over any defined time window is less than PLimit at all times (see Figure 2-2). At all times, TAS meets the below equation:

. .  

=

1 

-

.



()







Equation 2-1

where, . .   is the transmit power averaged between t-TSAR and t time period; TSAR is the time window defined by FCC for time-averaging RF exposure for Tx frequency less than 6GHz (sub6); inst. Tx power (t) is the instantaneous transmit power at t time instant; PLimit is the predefined time-averaged power limit.

Figure 2-1 Transmit at high power when needed and permitted

FCC ID: C3K2085

COMPLIANCE SUMMARY REPORT

Approved by: Technical Manager

Document S/N: 1M2311170118-02.C3K

DUT Type: Portable Computing Device

Page 6 of 10

REV 1.1 04/11/2022 Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from Element. If you have any questions or have an enquiry about obtaining additional rights to this report or assembly of contents thereof, please contact [email protected].

Figure 2-2 Transmit with reserve power to support continuous transmission at a minimum power level (Preserve)

 In the case of simultaneous transmission, TAS manages all active transmitters and make sure the total exposure ratio is less than 1



1 

-

()

  





1

Equation 2-2

FCC ID: C3K2085

COMPLIANCE SUMMARY REPORT

Approved by: Technical Manager

Document S/N: 1M2311170118-02.C3K

DUT Type: Portable Computing Device

Page 7 of 10

REV 1.1 04/11/2022 Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from Element. If you have any questions or have an enquiry about obtaining additional rights to this report or assembly of contents thereof, please contact [email protected].

2.3 Configurable Parameters

The following input parameters are required for functionality of Qualcomm FastConnect TAS algorithm. These parameters cannot be accessed by the end user, because at the factory they are entered through the BDF entries by the OEM.

Input Parameter regulatory body
Tx_power_at_SAR_design_target (PLimit in dBm) f < 6 GHz

Description
· Inputs of "0" and "1" corresponding to FCC and ICNIRP requirements for the averaging time windows.
· For FCC, algorithm uses an averaging window of 100 seconds for f < 3 GHz, 60 seconds for 3 GHz < f < 6 GHz, and 4 seconds for 24 GHz < f < 42 GHz.
The maximum time-averaged transmit power, in dBm, corresponding to the SAR_design_target.
SAR_design_target is pre-determined for this DUT and it is less than regulatory SAR limit after accounting for all design related tolerances. The time-averaged SAR is assessed against this SAR_design_target in real time to determine the compliance.
PLimit could vary with technology, band and Device State Index (DSI) and therefore, it has the unique value for each technology, band and DSI.

Reserve margin (Preserve in dBm)

The margin below PLimit reserved for future transmission with a minimum transmit power Preserve
Preserve (dBm) = Plimit (dBm) ­ Reserve margin (dB)

When the Reserve margin is set to 0 dB, TAS effectively limits the upper bound of the transmit power to Plimit and the DUT transmits continuously at Plimit without utilizing TAS dynamic control feature.

FCC ID: C3K2085

COMPLIANCE SUMMARY REPORT

Approved by: Technical Manager

Document S/N: 1M2311170118-02.C3K

DUT Type: Portable Computing Device

Page 8 of 10

REV 1.1 04/11/2022 Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from Element. If you have any questions or have an enquiry about obtaining additional rights to this report or assembly of contents thereof, please contact [email protected].

3

DUT DESCRIPTION

3.1 Device Overview

Band & Mode 2.4 GHz WIFI
5 GHz WIFI

Operating Modes

Tx Frequency

Data

2412 - 2472 MHz

Data

U-NII-1: 5180 - 5240 MHz U-NII-2A: 5260 - 5320 MHz U-NII-2C: 5500 - 5720 MHz U-NII-3: 5745 - 5825 MHz

6 GHz WIFI
2.4 GHz Bluetooth NFC

Data
Data Data

U-NII-5: 5935 - 6415 MHz U-NII-6: 6435 - 6515 MHz U-NII-7: 6535 - 6855 MHz U-NII-8: 6875 - 7115 MHz
2402 - 2480 MHz 13.56 MHz

This device uses the Qualcomm FastConnect feature to control and manage transmitting power in real time and to ensure at all times the time-averaged RF exposure is in compliance with the FCC requirement for WLAN operations. Additionally, this device supports BT/NFC technologies but the output power of these modems is not controlled by the FastConnect algorithm.

FCC ID: C3K2085

COMPLIANCE SUMMARY REPORT

Approved by: Technical Manager

Document S/N: 1M2311170118-02.C3K

DUT Type: Portable Computing Device

Page 9 of 10

REV 1.1 04/11/2022 Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from Element. If you have any questions or have an enquiry about obtaining additional rights to this report or assembly of contents thereof, please contact [email protected].

4

COMPLIANCE SUMMARY

4.1 RF Exposure Compliance Summary

All transmission scenarios that the DUT supports comply with FCC time-averaged RF exposure requirements, as shown in Table 4-1.

SAR (W/kg)

RFx Evaluation
Standalone 1g SAR
Simultaneous Tx 1g SAR

Table 4-1 Reported RF Exposure Levels

Power Level

FCC Limit

Plimit

1.6

Reported RF Exposure
Level
0.79

Plimit

1.6

1.59

Test Report
FCC SAR Evaluation Report
(Part 1)

b

FCC ID: C3K2085

COMPLIANCE SUMMARY REPORT

Approved by: Technical Manager

Document S/N: 1M2311170118-02.C3K

DUT Type: Portable Computing Device

Page 10 of 10

REV 1.1 04/11/2022 Unless otherwise specified, no part of this report may be reproduced or utilized in any part, form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from Element. If you have any questions or have an enquiry about obtaining additional rights to this report or assembly of contents thereof, please contact [email protected].



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