Wi-Fi 7与无线未来的持续发展（设计指南）

With the release of Wi-Fi 7, the industry is making steady progresstoward being the wireless transport of choice for indoor enterprisecoverage. Building on the advancements introduced by Wi-Fi 6 andWi-Fi 6E, Wi-Fi 7 (802.11be per IEEE) marks a significant upgrade.Wi-Fi 6 introduced Orthogonal Frequency-Division Multiple Access(OFDMA) and multi-user access, delivering a major leap in airtime Contents Much has already been written in blogs and release articles about the “speeds and feeds” of Wi-Fi 7.These performance boosts ultimately mean less waiting and more capacity. But beyond the headlinespeed increases, Wi-Fi 7 introduces several nuanced enhancements that significantly improve its Wi-Fi 7 – OverviewHigher Data Rates with 4096 QAM320-MHz Channel Width Let’s break down the key advancements—and how they translate into actionable benefits for your Wi-Fi 7 – Overview •4096 Quadrature Amplitude Modulation (QAM):Increases modulation density by 20%•320 MHz Channel Width:Doubles the data capacity compared to Wi-Fi 5 and Wi-Fi 6.•Multi-Link Operation (MLO):Allows clients to use multiple radio bands simultaneously,multiplying airtime opportunities.•Multiple Resource Unit (MRU):Improves allocation efficiency, minimizing wasted spectrum.•Preamble Puncturing:Helps avoid interference by selectively ignoring parts of a channel.•Enhanced Quality-of-Service (QoS):Enables deterministic handling of priority traffic for betterperformance in latency-sensitive applications. Wi-Fi 7 Efficiency EnhancementsDesign Considerations for Wi-Fi 7Deployment Priorities for Wi-Fi 7and Beyond 6GHz SpectrumSwitch Port PowerSwitch Port SpeedLocation Technologies, Smart Buildings,and IoT Access Layer Security and StrategyDesigning for the Future of Wi-Fi Contents Higher Data Rates with 4096 QAM Wi-Fi 7 – OverviewHigher Data Rates with 4096 QAM320-MHz Channel Width Wi-Fi 7 introduces 4096 QAM, which increases the maximum number of data bits encoded persymbol. Wi-Fi 6’s QAM1024 had 10 bits to Wi-Fi 7’s 12. This translates to a 20% increase in theamount of data that can be sent in a single symbol over the air. In Wi-Fi, both the carrier bandwidthand transmission duration are fixed. One way to transmit more data within this fixed space is by Wi-Fi 7 Efficiency EnhancementsDesign Considerations for Wi-Fi 7Deployment Priorities for Wi-Fi 7and Beyond 6GHz SpectrumSwitch Port PowerSwitch Port SpeedLocation Technologies, Smart Buildings,and IoT As the data bit density increases within the symbol, differences between individual bits get smaller.The Signal-to-Noise Ratio (SNR) required to accurately demodulate the message goes up as well, to> 43 db. This means that the clients closest to the access point (AP) will benefit the most. The rangereduction of Modulation and Coding Scheme (MCS) 12/13 is consistent with QAM density increases Access Layer Security and StrategyDesigning for the Future of Wi-Fi Contents 320-MHz Channel Width Wi-Fi 7 – OverviewHigher Data Rates with 4096 QAM320-MHz Channel Width With Wi-Fi 7, the maximum channel width increases from 160 MHz (in Wi-Fi 5/6) to 320 MHz,effectively doubling potential throughput. This added bandwidth also enables twice as many Wi-Fi 7 Efficiency EnhancementsDesign Considerations for Wi-Fi 7Deployment Priorities for Wi-Fi 7and Beyond 6GHz SpectrumSwitch Port PowerSwitch Port SpeedLocation Technologies, Smart Buildings,and IoT Wi-Fi 6E and 6-GHz spectrum created the possibility for a practical 320-MHz-wide channel width.A wider channel is a multiplier for data; a 320-MHz channel has twice the capacity of a 160-MHzchannel. Channel bonding comes at a cost of increased noise floor. For Wi-Fi 6E in the US, Canada,and other countries, this is taken care of by adding 3 dB to the maximum Effective Isotropic Radiated Access Layer Security and StrategyDesigning for the Future of Wi-Fi Contents Depending on the region of the world, there can be as few as one 320-MHz channel. At the mostthere are three available in a 1200-MHz allotment. The use of three channels here has the sameimplications as it did in 2.4 GHz, with the advantage that 6 GHz does not propagate as far as 2.4 Wi-Fi 7 – OverviewHigher Data Rates with 4096 QAM320-MHz Channel Width Are 320-MHz channels practical now? Time will tell—especially if spectrum availability can keep upwith demand. However, with the advancements in Wi-Fi 6E and Wi-Fi 7, there’s never been a better Note:A qualified assessment should be undertaken before making design and deployment changes.Mishandling the channel plan can result in diminished performance. Cisco’s Dynamic Bandwidth Key Technologies in Wi-Fi 7 Multi-Link Operation (MLO) Wi-Fi 7 Efficiency EnhancementsDesign Considerations for Wi-Fi 7Deployment Priorities for Wi-Fi 7and Beyond Multi-Link Operation is a fundamental sea change in Wi-Fi. As revolutionary as OFDMA was to Wi-Fi6 with its multiuser PHY, MLO will change the way we think about Wi-Fi. In previous generations ofWi-Fi, a cl