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Index
802.11ac: A Survival Guide
Dedication
Foreword
Preface
Audience
Conventions Used in This Book
Safari® Books Online
How to Contact Us
Acknowledgments
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
802.11ac Product Development Plans
2. The PHY
Extended MIMO Operations
Radio Channels in 802.11ac
Radio Channel Layout
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
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
3. The MAC
Framing
Frame Size and Aggregation
Management Frames
The VHT Capabilities Information element
The VHT Operation Information element
Other management frame changes
Medium Access Procedures
Clear-Channel Assessment (CCA)
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
4. Beamforming in 802.11ac
Beamforming Basics
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
Channel Calibration for Multi-User Beamforming
NDP Announcement frame
NDP frame
Compressed Beamforming Action frame
Beamforming Report Poll frame
Multi-User MIMO Transmission
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
5. 802.11ac Planning
Getting Ready for 802.11ac
Catching the 802.11ac Technology Wave
First wave 802.11ac versus second wave 802.11ac
Client Device Mix
Application Planning
Admission control
Physical Network Connections
Backbone connectivity
Power requirements
Security
Link-layer encryption
Fast roaming
Management frame protection
Authentication
Additional Planning Considerations
Guest management
Intrusion detection
802.11ac Radio Planning
Available Radio Channels
Coverage and Capacity Estimates
Initial 802.11ac AP mounting locations
5 GHz coverage and 802.11ac-only APs
Equipment Selection
Network Architecture for 802.11ac
Architecture comparison
Selecting a network architecture
Management plane
Data plane
Control plane
Hardware Considerations
Mandatory tests
Optional tests
Building an 802.11ac Network
Channel Selection
Network Tuning and Optimization
Voice
Multicast
Checklist
Glossary
Colophon
Copyright
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