Day 1: Wi-Fi Technology Overview

Transcription

1 Duration: 5days Hands on: Wireshark based real-life Wi-Fi packet trace analysis Demos : Alethea Wicheck multi-sta emulator for understanding performance of Wi-Fi APs and to study impact of multiple clients running different traffic types Demo using WLANPi to showcase the powerful sniffing using simple tools Day 1: Wi-Fi Technology Overview Wi-FI Overview IEEE standards and its role WFA and its role; interoperability and certification Relationship between and Wi-Fi Wi-Fi networks; BSS/IBSS/P2P/mesh BSS, IBSS, ESS, DS, BSSID, SSID, MBSS Typical evolution of the Wi-Fi AP along with the ecosystem Important chipset players ODMs Breakup of solution; software, hardware, and firmware Role of open-source solutions like openwrt Wi-Fi direct vs. ad-hoc networks ; differences Mesh and WDS; what is the need?. IEEE set of standards and their evolution Speeds and bandwidths Key technologies; OFDM, MIMO, and their impacts Upcoming standards; new technologies like OFDMA Spectrum of operation Security, QoS, and other features evolution

2 WLAN deployment scenarios; home vs. hotspot vs. service provider vs. enterprise Wi-Fi product space; a survey of some interesting features Wi-Fi and IOT; link with BLE and Zigbee/Thread ba; Wi-Fi Wakeup radio and its impacts Wi-Fi and voice ; Wi-Fi calling Wi-Fi and LTE unlicensed ad/ay; 60 GHz Wi-Fi status Future of Wi-Fi; multiband optimization, optimized connectivity and other initiatives Day 2: Wi-Fi PHY. Layer Challenges; the channel environment Problems with high data rate communication Role of PHY. Layer in and 5 GHz channels ; 20/40/80/160 MHz bandwidth operations Power of Wi-Fi; use of dbs, dbms, dbi DFS; Why and some rules Modulation and error control coding; MCS PHY. layer technology evolution; /11b/11a/11g/11n/11ac OFDM fundamentals o Subcarrier spacing, OFDM symbol period, cyclic prefix

3 o Calculation of PHY. Data rate and its implication OFDM in evolution and calculations MIMO basics o Differences between diversity, spatial multiplexing, and STBC o Costs of MIMO Spatial streams ; product and link configurations and their impacts Data rate calculations; different rates of operation in a Wi-Fi network Receive sensitivity Beamforming o Differences with STBC o Feedback steps MU-MIMO o How is it different to normal MIMO o Advantages o Links with beamforming Future of the PHY in o OFDMA o MU-MIMO enhancements Day 3 : Medium Access Control Concepts and Wi-Fi Operations Role of MAC, interactions with other layers Terminology ; MSDU/MPDU, header, FCS DCF Protocol in WLAN CSMA/CA Role of PHY in CCA DCF parameters; DIFS/SIFS, slot time Basic DCF frame exchange Hidden node problems RTS/CTS/CTS-Self; virtual carrier sensing, NAV concepts MAC frame formats; types of frames, frame headers

4 Basic DCF throughput analysis MAC layer aspects of n o Frame aggregation and its impact o A-MSDU and A-MPDU o TCP/IP and UDP/IP throughput impact with aggregation o MAC frame impacts with frame aggregation o Block Acknowledgement and TXoP Beacons Network Entry Process Active and Passive Scanning Association Security Concepts in WLAN o WPA/WPA2/WPS Virtual APs Evolution of power save techniques (Legacy, WMM, and SM power save) Rate adaptation; typical rates QoS in Day 4 : Understanding Wi-Fi Through Packet Analysis Quick recap of Wi-Fi protocol and capabilities understanding Data frames addressing o Source/transmit and destination/receive addressing QoS Control field analysis; A-MSDU and TID info.

5 o QoS data type o A-MSDU insights o QoS access category Retransmissions monitoring o How can we debug potential Wi-Fi performance problems?. MIMO; spatial streams, STBC, antennas etc. Use of RTS/CTS Power save in Wi-Fi; use of null frames Wi-Fi roaming without 11r r basics Trace analysis with and without 11r o 11r related capabilities exchange o Different keys and their roles Use of 11k and its impacts o 11k related capabilities o Neighbour request messages 11v BSS Transition management and its impacts o 11v capabilities How to look at PHY. Related information, MCS, rates, beamforming, bandwidth etc. AP and client support for beamforming ; where to find out? Beamforming example; starting from Sounding to data transmission Potential problem scenarios ; where could things go wrong?..

6 Day 5 : ax Module 1 :Introduction and Overview (1.5 hours) /Wi-Fi evolution and Status Real-life challenges of /Wi-Fi; high-density/large number of APs.. Drawbacks of ac Motivation for ax New use cases Status of the standardization and documents RF bands of operation Competition from LTE-unlicensed (LTE-U,LAA, and MuLTEfire) LTE plus Wi-Fi approaches Module 2 :802.11ax technology - PHY (2 hours) High-level view of different PHY. modes in 11ax OFDM vs. OFDMA Concept of Rus and splits of various bandwidths Outdoor operation Handling multiple users on the DL; MU-MIMO and OFDMA OFDMA and its differences with plain OFDM Why OFDMA for 11ax?. OFDMA details and options for different bandwidths Coding and higher order modulation possibilities in 11ax

7 Rates in 11ac vs. 11ax Module 3 : Multiuser Operation in ax (2 hours) Current multiuser framework in Performance of in high-density environments Challenges due to control and management frames Downlink multiuser operational details o Scheduling Uplink multiuser operations o Scheduling and triggering Module 4 :MAC enhancements in ax (1.5 hours) CSMA/CA challenges in in presence of multiple BSS Dynamic CCA Thresholds o Motivation o Approaches to solve problem o Coexistence challenges ax channel access rule NAV settings in 11ax Spatial reuse rules and impacts.. RTS enforcement Multi-BSS announcement Trigger TWT New power save considerations New features * * * * * * *