802.11ai Physical Rates ========================= .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What are physical rates in IEEE 802.11ai?** Physical rates refer to the data transmission speeds defined at the PHY layer used by 802.11ai devices. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Does 802.11ai define new physical rates?** No, 802.11ai uses physical rates defined by underlying PHY standards like 802.11ac or 802.11ax. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How are physical rates selected in 802.11ai networks?** They are chosen dynamically based on link conditions, signal quality, and network management algorithms. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Why is physical rate adaptation important in 802.11ai?** To optimize throughput and reliability by adjusting transmission speed to current channel conditions. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does 802.11ai assist physical rate control?** It provides enhanced network management information to help devices choose appropriate rates. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are legacy rates supported in 802.11ai?** Yes, backward compatibility ensures support for legacy physical rates where needed. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What PHY modulation schemes affect physical rates in 802.11ai?** Modulations like QAM, OFDM, and DSSS from base PHY standards determine achievable rates. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Does 802.11ai support multi-user physical rates?** Yes, it works with multi-user MIMO and OFDMA techniques defined in underlying PHY layers. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does physical rate impact power consumption in 802.11ai devices?** Higher rates may consume more power; rate adaptation helps balance speed and energy efficiency. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Can physical rates be different for uplink and downlink?** Yes, rates can be independently selected for uplink and downlink based on link quality. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How is physical rate information reported in 802.11ai?** Devices report link metrics to access points, assisting rate control and network management. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Do physical rates affect latency in 802.11ai?** Yes, higher rates generally reduce transmission time and lower latency. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the role of PHY layer feedback in physical rate selection?** Feedback like SNR and error rates guide dynamic adaptation to optimize performance. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Is physical rate control centralized or distributed in 802.11ai?** It can be both; APs and clients collaborate using network-assisted mechanisms. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Can 802.11ai physical rates support dense network environments?** Yes, efficient rate adaptation helps maintain throughput in crowded Wi-Fi deployments. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How do interference and noise impact physical rates?** They degrade signal quality, causing devices to lower rates to maintain connection stability. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are physical rates standardized internationally in 802.11ai?** Yes, 802.11ai follows international IEEE standards ensuring global compatibility. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How can users monitor physical rates in their networks?** Many access points provide rate statistics via management interfaces or apps. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Where can I find detailed technical specs on 802.11ai physical rates?** IEEE 802.11ai standard documents and PHY layer specifications in 802.11ac/ax provide details. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow Topics in this section, * :ref:`physical_rates in 802.11ax ` * :ref:`Reference links ` .. _physical_rates_ai_step4: .. tab-set:: .. tab-item:: physical_rates in 802.11ai =========== ==== ==== =========== ============ =========== ================ ========= ============ =========== ========== =========== Modulation BW Tsc FSP=BW/Tsc Tdata=1/FSP GI (ns) Symbol (ns) 1/Symbol Bits/Symbol Code rate Usable sc Rate (Mbps) =========== ==== ==== =========== ============ =========== ================ ========= ============ =========== ========== =========== BPSK 20 256 78.125 12.8 800 13.6 0.0735 1 1/2 234 7.8 BPSK 20 256 78.125 12.8 400 13.2 0.0758 1 3/4 234 11.7 QPSK 20 256 78.125 12.8 800 13.6 0.0735 2 1/2 234 15.6 QPSK 20 256 78.125 12.8 400 13.2 0.0758 2 3/4 234 23.4 16-QAM 20 256 78.125 12.8 800 13.6 0.0735 4 1/2 234 31.2 16-QAM 20 256 78.125 12.8 400 13.2 0.0758 4 3/4 234 46.8 64-QAM 20 256 78.125 12.8 800 13.6 0.0735 6 2/3 234 41.6 64-QAM 20 256 78.125 12.8 400 13.2 0.0758 6 3/4 234 46.8 256-QAM 20 256 78.125 12.8 800 13.6 0.0735 8 3/4 234 62.4 256-QAM 20 256 78.125 12.8 400 13.2 0.0758 8 5/6 234 78.0 1024-QAM 20 256 78.125 12.8 800 13.6 0.0735 10 3/4 234 78.0 1024-QAM 20 256 78.125 12.8 400 13.2 0.0758 10 5/6 234 97.5 BPSK 40 512 78.125 12.8 800 13.6 0.0735 1 1/2 468 15.6 BPSK 40 512 78.125 12.8 400 13.2 0.0758 1 3/4 468 23.4 QPSK 40 512 78.125 12.8 800 13.6 0.0735 2 1/2 468 31.2 QPSK 40 512 78.125 12.8 400 13.2 0.0758 2 3/4 468 46.8 16-QAM 40 512 78.125 12.8 800 13.6 0.0735 4 1/2 468 62.4 16-QAM 40 512 78.125 12.8 400 13.2 0.0758 4 3/4 468 93.6 64-QAM 40 512 78.125 12.8 800 13.6 0.0735 6 2/3 468 83.2 64-QAM 40 512 78.125 12.8 400 13.2 0.0758 6 3/4 468 93.6 256-QAM 40 512 78.125 12.8 800 13.6 0.0735 8 3/4 468 124.8 256-QAM 40 512 78.125 12.8 400 13.2 0.0758 8 5/6 468 156.0 1024-QAM 40 512 78.125 12.8 800 13.6 0.0735 10 3/4 468 156.0 1024-QAM 40 512 78.125 12.8 400 13.2 0.0758 10 5/6 468 195.0 BPSK 80 1024 78.125 12.8 800 13.6 0.0735 1 1/2 980 32.7 BPSK 80 1024 78.125 12.8 400 13.2 0.0758 1 3/4 980 49.1 QPSK 80 1024 78.125 12.8 800 13.6 0.0735 2 1/2 980 65.4 QPSK 80 1024 78.125 12.8 400 13.2 0.0758 2 3/4 980 98.1 16-QAM 80 1024 78.125 12.8 800 13.6 0.0735 4 1/2 980 130.8 16-QAM 80 1024 78.125 12.8 400 13.2 0.0758 4 3/4 980 196.2 64-QAM 80 1024 78.125 12.8 800 13.6 0.0735 6 2/3 980 174.5 64-QAM 80 1024 78.125 12.8 400 13.2 0.0758 6 3/4 980 196.2 256-QAM 80 1024 78.125 12.8 800 13.6 0.0735 8 3/4 980 261.6 256-QAM 80 1024 78.125 12.8 400 13.2 0.0758 8 5/6 980 326.9 1024-QAM 80 1024 78.125 12.8 800 13.6 0.0735 10 3/4 980 326.9 1024-QAM 80 1024 78.125 12.8 400 13.2 0.0758 10 5/6 980 408.6 BPSK 160 2048 78.125 12.8 800 13.6 0.0735 1 1/2 1960 65.4 BPSK 160 2048 78.125 12.8 400 13.2 0.0758 1 3/4 1960 98.1 QPSK 160 2048 78.125 12.8 800 13.6 0.0735 2 1/2 1960 130.8 QPSK 160 2048 78.125 12.8 400 13.2 0.0758 2 3/4 1960 196.2 16-QAM 160 2048 78.125 12.8 800 13.6 0.0735 4 1/2 1960 261.6 16-QAM 160 2048 78.125 12.8 400 13.2 0.0758 4 3/4 1960 392.4 64-QAM 160 2048 78.125 12.8 800 13.6 0.0735 6 2/3 1960 349.0 64-QAM 160 2048 78.125 12.8 400 13.2 0.0758 6 3/4 1960 392.4 256-QAM 160 2048 78.125 12.8 800 13.6 0.0735 8 3/4 1960 523.2 256-QAM 160 2048 78.125 12.8 400 13.2 0.0758 8 5/6 1960 653.8 1024-QAM 160 2048 78.125 12.8 800 13.6 0.0735 10 3/4 1960 653.8 1024-QAM 160 2048 78.125 12.8 400 13.2 0.0758 10 5/6 1960 817.2 =========== ==== ==== =========== ============ =========== ================ ========= ============ =========== ========== =========== .. _physical_rates_ai_step17: .. tab-set:: .. tab-item:: Reference links * Reference links