802.11ak 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 802.11ak?** Physical rates refer to the data transmission speeds supported at the PHY layer, inherited from base Wi-Fi standards. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Does 802.11ak define new physical rates?** No, it uses the physical rates defined by underlying standards like 802.11a/b/g/n/ac. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does 802.11ak influence physical rate selection?** It provides measurement data that helps devices adapt rates based on channel conditions and interference. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What modulation schemes are used in 802.11ak physical rates?** Standard schemes like DSSS, OFDM, and those from 802.11n/ac depending on the device. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Can 802.11ak devices dynamically change rates?** Yes, devices use link and channel quality measurements to select optimal transmission rates. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How do channel load reports affect physical rates?** High channel load can prompt devices to lower rates to reduce retransmissions and interference. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are multi-link transmissions supported at physical rate level?** Yes, 802.11ak supports multiple links, each potentially operating at different physical rates. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How is physical rate adaptation coordinated in multi-link scenarios?** Using measurement reports and link feedback to balance rates across links for efficiency. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Does 802.11ak support MIMO technologies affecting physical rates?** It inherits MIMO support from base standards, enabling higher rates through spatial streams. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What role does SNR play in determining physical rates in 802.11ak?** Higher Signal-to-Noise Ratio enables selection of higher modulation and coding schemes for faster rates. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How do devices handle rate fallback in poor conditions?** They reduce modulation rates or spatial streams to maintain reliable communication. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Is physical rate information reported to the AP in 802.11ak?** Yes, devices report link quality metrics to assist APs in resource and rate management. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are there any new physical rate metrics introduced in 802.11ak?** No new rates, but enhanced measurement feedback helps optimize existing rates. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Can physical rates vary between different links in 802.11ak?** Yes, each link can use the most suitable rate based on local conditions. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How does interference impact physical rates in 802.11ak?** Increased interference typically forces lower rates to ensure data integrity. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Is physical rate control centralized or distributed in 802.11ak?** Both approaches can be used; APs may guide rates using reports, or clients adapt locally. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Does 802.11ak physical rate selection affect power consumption?** Yes, higher rates generally require more power but reduce transmission time. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How do physical rates in 802.11ak compare with previous standards?** They match or extend previous standard rates through multi-link and enhanced measurement capabilities. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Where can I find official documentation on 802.11ak physical rates?** Refer to the IEEE 802.11ak amendment and related PHY standards like 802.11n/ac documents. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow Topics in this section, * :ref:`physical_rates in 802.11r ` * :ref:`Reference links ` .. _physical_rates_ak_step4: .. tab-set:: .. tab-item:: physical_rates in 802.11ak =========== === ==== =========== ============ =========== ================ ========= ============ =========== ========== ======= Modulation BW Tsc FSP=BW/Tsc Tdata=1/FSP GI=Tdata/4 Symbol=Tdata+GI 1/Symbol Bits/Symbol Code rate Usable sc Rate (Mbps) =========== === ==== =========== ============ =========== ================ ========= ============ =========== ========== ======= BPSK 5 64 78.125 12.8 3.2 16 0.0625 1 1/2 48 1.5 BPSK 5 64 78.125 12.8 3.2 16 0.0625 1 3/4 48 2.25 QPSK 5 64 78.125 12.8 3.2 16 0.0625 2 1/2 48 3 QPSK 5 64 78.125 12.8 3.2 16 0.0625 2 3/4 48 4.5 16-QAM 5 64 78.125 12.8 3.2 16 0.0625 4 1/2 48 6 16-QAM 5 64 78.125 12.8 3.2 16 0.0625 4 3/4 48 9 64-QAM 5 64 78.125 12.8 3.2 16 0.0625 6 2/3 48 12 64-QAM 5 64 78.125 12.8 3.2 16 0.0625 6 3/4 48 13.5 256-QAM 5 64 78.125 12.8 3.2 16 0.0625 8 3/4 48 18 256-QAM 5 64 78.125 12.8 3.2 16 0.0625 8 5/6 48 20 BPSK 10 64 156.25 6.4 1.6 8 0.125 1 1/2 48 3 BPSK 10 64 156.25 6.4 1.6 8 0.125 1 3/4 48 4.5 QPSK 10 64 156.25 6.4 1.6 8 0.125 2 1/2 48 6 QPSK 10 64 156.25 6.4 1.6 8 0.125 2 3/4 48 9 16-QAM 10 64 156.25 6.4 1.6 8 0.125 4 1/2 48 12 16-QAM 10 64 156.25 6.4 1.6 8 0.125 4 3/4 48 18 64-QAM 10 64 156.25 6.4 1.6 8 0.125 6 2/3 48 24 64-QAM 10 64 156.25 6.4 1.6 8 0.125 6 3/4 48 27 256-QAM 10 64 156.25 6.4 1.6 8 0.125 8 3/4 48 36 256-QAM 10 64 156.25 6.4 1.6 8 0.125 8 5/6 48 40 BPSK 20 64 312.5 3.2 0.8 4 0.25 1 1/2 48 6 BPSK 20 64 312.5 3.2 0.8 4 0.25 1 3/4 48 9 QPSK 20 64 312.5 3.2 0.8 4 0.25 2 1/2 48 12 QPSK 20 64 312.5 3.2 0.8 4 0.25 2 3/4 48 18 16-QAM 20 64 312.5 3.2 0.8 4 0.25 4 1/2 48 24 16-QAM 20 64 312.5 3.2 0.8 4 0.25 4 3/4 48 36 64-QAM 20 64 312.5 3.2 0.8 4 0.25 6 2/3 48 48 64-QAM 20 64 312.5 3.2 0.8 4 0.25 6 3/4 48 54 256-QAM 20 64 312.5 3.2 0.8 4 0.25 8 3/4 48 72 256-QAM 20 64 312.5 3.2 0.8 4 0.25 8 5/6 48 80 =========== === ==== =========== ============ =========== ================ ========= ============ =========== ========== ======= .. _physical_rates_ak_step17: .. tab-set:: .. tab-item:: Reference links * Reference links