1. Understanding Wi-Fi networking in Windows 8
9/17/2018 1:30 AM
HW-342T
Understanding Wi-Fi networking in Windows 8
Drew Baron
Lead Program Manager
Microsoft Corporation
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

2. Agenda Wi-Fi power, performance and experience improvements
Connected Standby
Wi-Fi device connectivity
You’ll leave knowing:
How to create high-quality Wi-Fi hardware and drivers that take advantage of new Windows 8 features
How Windows 8 enables connectivity experiences for new form factors and customer scenarios

3. Trends shaping wireless landscape
Explosion of form factors
PCs that are always connected to the internet
Ubiquitous Wi-Fi ability on PCs
On-battery is becoming a norm

4. Connecting with Windows 8
Simplified User Experience Smart about Networks Robust platform for differentiation

5. Low-power, fast and simple Wi-Fi connectivity

6. Power improvements in Windows 8
Windows 8 will reduce power consumption from Wi-Fi
Wi-Fi devices are more autonomous:
Automatic power save mode
Reduction in host CPU interrupts
Packet coalescing
Wi-Fi Service
Wi-Fi Service
Driver
Driver
Wi-Fi Device
Wi-Fi Device

7. Instant Connect
Windows 7
Windows 8
People expect to be able to pick up a device and use it immediately
Innovating with hardware
Network list offloading
Focus very precisely on software paths
Optimizing
Reducing timing
Identifying
Wi-Fi Service
Wi-Fi Service
Driver
Driver
Wi-Fi Device
Wi-Fi Device

8. demo
Instant Connect

9. Greatly reduced connection time+ + +
seconds
© 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

10. Experience improvements
Customers don’t want to think about getting connected they want to be connected
Windows 8 gracefully transitions between various networking technologies
Windows 8 includes integrated Radio Management

11. Connecting to the right network Radio Management
demo
Connecting to the right network Radio Management

12. Connected Standby

13. Connected Standby New Windows power state available on PCs
The PC’s screen is off, but the device remains in a very low idle state
The network adapter maintains a connection to the network
Metro style apps continue to receive live tile updates and toast notifications
Background Tasks and Push Notifications enable customers to receive real-time communication, such as , IM and VoIP calls

14. Wi-Fi offloading for Connected Standby
Device offload enables Connected Standby
Keep network connected while CPU/SoC is in deepest idle state
Achieved by offloading functionality to Wi-Fi device
Wi-Fi devices support wake patterns and power-save capabilities
Wi-Fi driver does auto-power save mode (PSM)
Wake patterns used for Push Notifications
Windows 8 PC
Core
Chipset/SoC
Memory
Wi-Fi
Storage

15. Push Notifications during Connected Standby
Metro style real-time apps can receive push notifications while in Connected Standby mode
Real-time apps register TCP connections to servers via RTC Trigger APIs
Windows 8 helps ensure network connection to servers aren’t dropped
Servers send notification packets to clients when their attention is needed
Very energy efficient!
Messaging
SMS … !
Windows 8
NIC
Network
Server !

16. Wi-Fi Direct

17. What is Wi-Fi Direct ? Is a peer-to-peer connectivity technology
Provides a secure, wireless connection between two devices
Does not require a Wi-Fi router or joining a Wi-Fi network
In Windows 8 Wi-Fi Direct
Builds on existing Wi-Fi hardware
Allows concurrent connection to internet & devices
Is optimized for power savings
Supports native scenarios such as Play To and Proximity

18. Windows Certification for Wi-Fi devices

19. Certification for Wi-Fi
Scenario
Feature
Certification for Wi-Fi
Connected Standby
Wake, Network List Offload
Windows 8 creates new customer expectations for Wi-Fi-based experiences
Certification for Wi-Fi enables you to deliver high-quality hardware and drivers
Developed and tested with feedback from partners
Certification for Wi-Fi is tailored for systems that support Connected Standby
Instant Connect
Network List Offloading
Power
Interrupt Reduction
Power
Packet Coalescing
Power
USB Selective Suspend
Power
Wi-Fi Auto Power Save Mode
Flight Mode
Radio Management
Play To, Proximity
Wi-Fi Direct
Basics
802.11n, w (PMF – Enterprise security)

20. Recap

21. In summary
Windows 8 connects to Wi-Fi networks quickly and efficiently
Windows 8 enables connectivity while in Connected Standby
Wi-Fi direct on Windows 8 delivers new device connectivity experiences

22. Call to action
Provide high quality networking hardware and drivers that support new Windows 8 features
Work with Wi-Fi inbox team to get your driver inbox
Use Windows Certification for Wi-Fi to ensure quality, compatibility and interoperability for drivers
Use Windows Update for driver serviceability

23. Related sessions
[732] Connecting Windows 8 to mobile broadband and Wi-Fi networks
[331] Understanding mobile broadband and connection Management in Windows 8
[329] Building great Wi-Fi Direct Devices
[456] Understanding Connected Standby
[566] Networking for Connected Standby
[260] Windows Certification: Improvements to the Logo Program

24. Further reading and documentation
Wi-Fi Direct (WFD) Reference
Windows Hardware Dev Center
Windows Dev Center
Contact info –

25. 9/17/2018 1:30 AM
© 2011 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.
© 2011 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

26. Backup

27. Agenda Trends shaping Windows Wireless Future Windows WLAN Feature Set
Power and Performance changes
New in Wi-Fi Device connectivity
Always On Always Connected
Windows 7 vs. Windows 8 Logo Requirements
Platform and form factor differences
Call to Action

28. Features required for AOAC
Windows WLAN Features
Feature
Description
Wi-Fi Direct
A peer-to-peer connectivity solution that builds on today’s AP/STA Wi-Fi CERTIFIED™ devices and Internet access Wi-Fi technology. Helps improve device connectivity experience.
Connection Manager
A light weight cross media connection engine for effortless connection management.
Radio Management
Software radio ON/OFF controls for different media types.
WPS 2.0
Windows support WPS 2.0 which enables faster discovery of devices and better interoperability.
IEEE w
IEEE standard for protected management frames.
No Pause on Suspend
A new feature to enhance the reliability and lower the 9F failures.
Wi-Fi Auto PSM
Windows will support the Wi-Fi Power Save Mode.
USB Selective Suspend
Windows will natively support USB selective suspend for USB interfaces.
D0- Packet Coalescing
A coalescing scheme for cutting down the impact of noisy traffic on system power consumption.
Network List Offload
A feature to offload certain network hints to NIC to optimize power efficiency and connectivity.
WoWLAN/Wake Packet detection (WPD)
A feature to remotely wake the sleeping machine as and when needed. It will help system to sleep and at the same time be reachable. WPD will track the reason of wake.
Power Management
Features required for AOAC

29. Windows 7 vs. Windows 8 Logo Requirement s
Content
Win7 Logo Kit
(WLK 1.5 and WLK 1.6)
Win8 Logo Kit (WLK 2.0)
PC Architecture/SoC Architecture
# of Requirements
23 (18 Required, 5 optional)
23/23 (19/21 Required, 4/2 optional)
IEEE n
Optional
Required
NDIS 6.30/ No Pause on Suspend NA
IEEE w Protected Management Frames
Hygiene - DPC/Interrupt Reduction
1 interrupt/packet + 4 times per sec
DPC duration < 2ms and Combined DPC duration < 4s / 10 sec period
Wi-Fi Direct
Throughput
54Mbps for 2 hours (No tests in kit)
20 Mbps for 10 minutes
Scanning performance
Optimized scan (NLO) - NA
Preferred channel scan – 4 sec
All channel scan – 8 sec +
Optimized scan (NLO) – < 1 sec
Preferred channel scan – 3.5 sec
All channel scan – 4 sec
Network List offload
D0 Packet Coalescing
Optional/Required
WoWi-Fi
WoWi-Fi Capability
Magic Packet + 8 patterns
GTK refresh in D3
Magic Packet + 16 patterns
Wake on Disconnect
Wake on NLO match
Wake on Roaming
Wake Packet Indication
ARP/NS Responders
Key Takeaways:
Split between Traditional PC and SoC architectures.
Retired some requirements/tests and added new ones.
New features – Wi-Fi Direct, w, AOAC.
Scanning performance improved.
Wake - expanded
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MICROSOFT CONFIDENTIAL

30. Testing Wi-Fi Devices Wi-Fi Certification Program Kit
Ensures high quality Windows complaint Wi-Fi drivers.
Supports x86, amd64 and ARM platforms.
Requirements pivot on architecture and power model i.e., ARM vs. Non ARM and AOAC vs. Non AOAC.
Tests new Win8 features (listed above).
Tests fundamentals like connection times, scanning times, power and performance etc.
Wake on Wireless testing expanded from Win7 to support Always on Always Connected behavior.
Standalone test tools.
WFDTestTool: Used for PC to PC Wi-Fi Direct Testing. Tests WFD discovery, paring, reconnect scenarios etc.
DPCISRTest: TAEF (Test automation and execution framework) based tool for measuring DPC/ISR frequency and duration.
VWifiStress: Used to stress systems and drivers via WLAN APIs
MagicPacketGenerator: Used to generate magic packet for testing wake.
Reference: <Link to Video Recording>

31. Wi-Fi Logo Requirements
Feature
PC Architecture
SoC Architecture
Radio Management
Required
Wi-Fi Direct
802.11w
NDIS 6.30
Wi-Fi Auto Power Save Mode
USB Selective Suspend
DPC/Interrupt Reduction
Required*
Network List Offload
D0 – Packet Coalescing
If Implemented
Wake on Wi-Fi
Split the logo requirements based on architecture i.e. PC architecture and SoC based architecture. PC architecture chipsets lack in on-chip memory and processing power. So they can’t support certain features.
Sharing of requirements began as far back as early Q4 CY2010
*Implementation details differ slightly – requirements are more aggressive on SoC platforms
Add detail about deltas: interrupt reduction
Add
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MICROSOFT CONFIDENTIAL

32. What is AOAC (Always ON Always Connected)
How does AOAC differ from Today’s Power Model
System is conceptually “Always On” and available to execute code
…vs. utilizing system sleep states that halt the execution.
Provides the illusion that the system is always available and network connected.
.. vs loosing all network connectivity when not in use
Enables fine grain and loosely coupled power management.
.. vs centralized, system wide coordination of power states.
From user’s prospective there are 3 device states.
No discreet states from hardware prospective.
Usage scenario driven system component power state.
Applications, services, driver, platform, OS all work together to minimize power consumption while delivering appropriate user experience.

33. The Low Power PC
Hardware uses low-power DRAM, busses, and devices
Delivers all-day battery life even with immersive application experiences
Can remain connected to the Internet
Transitions instantly between on and off states
Requires networking solutions engineered for low-power

34. Connected Standby New Windows power state available on low power PCs
The PC’s screen is off, but the device remains in a very low idle state
Batteries can last for weeks when in Connected Standby
The network adapter maintains a connection to the network
Metro style apps continue to receive live tile updates and toast notifications
Background Tasks and Push Notifications enable customers to receive real- time communication, such as , IM and VoIP

35. Push Notifications During Connected Standby
Messaging
SMS …
Real-time Apps register TCP connections to servers via RTC Trigger APIs
Servers send notification packets to clients when their attention is needed
Windows 8 helps ensure network connections aren’t dropped
Very energy efficient! !
Windows 8
NIC
Network

36. thank you Feedback and questions http://forums.dev.windows.com
Session feedback

37. 9/17/2018 1:30 AM
© 2011 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.
© 2011 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries.
The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.