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Index
802.11ac: A Survival Guide
802.11ac: A Survival Guide
Matthew Gast
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Foreword
Julius Genachowski
Preface
Audience
Note
Conventions Used in This Book
Tip
Caution
Safari® Books Online
Note
How to Contact Us
Acknowledgments
Chapter 1. Introduction to 802.11ac
History
The Core Technology of 802.11ac
Beamforming and Multi-User MIMO (MU-MIMO)
Operating Frequency Band for 802.11ac
Warning
802.11ac Product Development Plans
Chapter 2. The PHY
Extended MIMO Operations
Note
Radio Channels in 802.11ac
Radio Channel Layout
Note
Radio channel spectral mask
Available Channel Map
Transmission: Modulation, Coding, and Guard Interval
Modulation and Coding Set (MCS)
256-QAM modulation
Guard Interval
Error-Correcting Codes
PHY-Level Framing
Note
The VHT Signal Fields
VHT Signal A field
VHT Signal B field
The Data Field
The Transmission and Reception Process
802.11ac Data Rates
802.11ac Data Rate Matrix
“Missing” MCS values
Comparison of 802.11ac Data Rates to Other 802.11 PHYs
Mandatory PHY Features
Chapter 3. The MAC
Framing
Frame Size and Aggregation
Note
Management Frames
The VHT Capabilities Information element
Tip
The VHT Operation Information element
Other management frame changes
Medium Access Procedures
Clear-Channel Assessment (CCA)
Note
Basic channel access rules
Sensitivity requirements
Protection and Coexistence of 802.11ac with Older 802.11 Devices
Dynamic Bandwidth Operation (RTS/CTS)
Security
Mandatory MAC Features
Chapter 4. Beamforming in 802.11ac
Beamforming Basics
Tip
Tip
Null Data Packet (NDP) Beamforming in 802.11ac
Channel measurement (sounding) procedures
The feedback matrix
Single-User (SU) Beamforming
Channel Calibration for Single-User Beamforming
NDP Announcement frame
NDP frame
VHT Compressed Beamforming Action frame
Multi-User (MU) Beamforming
Tip
Tip
Channel Calibration for Multi-User Beamforming
NDP Announcement frame
NDP frame
Compressed Beamforming Action frame
Beamforming Report Poll frame
Multi-User MIMO Transmission
Tip
Tip
PHY changes for MU-MIMO
Transmission and reception of multi-user data streams
MU-MIMO Implementation
Null steering
Acknowledgement in MU-MIMO
Queuing and quality of service
Chapter 5. 802.11ac Planning
Getting Ready for 802.11ac
Tip
Catching the 802.11ac Technology Wave
First wave 802.11ac versus second wave 802.11ac
Client Device Mix
Tip
Application Planning
Note
Admission control
Physical Network Connections
Backbone connectivity
Note
Note
Power requirements
Warning
Security
Link-layer encryption
Note
Fast roaming
Management frame protection
Authentication
Additional Planning Considerations
Guest management
Intrusion detection
802.11ac Radio Planning
Available Radio Channels
Coverage and Capacity Estimates
Warning
Initial 802.11ac AP mounting locations
Note
5 GHz coverage and 802.11ac-only APs
Equipment Selection
Network Architecture for 802.11ac
Architecture comparison
Selecting a network architecture
Management plane
Note
Data plane
Note
Control plane
Note
Hardware Considerations
Mandatory tests
Optional tests
Building an 802.11ac Network
Channel Selection
Tip
Network Tuning and Optimization
Warning
Voice
Multicast
Checklist
Glossary
About the Author
Colophon
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802.11ac: A Survival Guide
Matthew Gast
Editor
Mike Loukides
Editor
Meghan Blanchette
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