Issue link: https://resources.mouser.com/i/1520712
29 Qorvo 2024 This proposed feature can substantially enhance the use of the secondary channel. EMLSR could lead to between 50 and 70 percent improvements in throughput gain even while subjected to a heavy overlapping basic service set (OBSS) load on single-link (SL) or both primary link (PL) and SL. Hence, this method allows devices with a limited number of transceivers to enhance the latency of a client device without adding significant complexity. Enhanced Multi-link Multi-radio EMLMR allows for Wi-Fi devices to operate on multiple links concurrently. There are two EMLMR modes: non- simultaneous transmit and receive (NSTR) and simultaneous transmit and receive (STR). In NSTR EMLMR, no simultaneous transmission and reception is allowed over the pair of links to prevent self-interference. With STR EMLMR, where self- interference isn't a concern due to sufficient frequency separation between the channels or self-interference cancelation capabilities, full simultaneous use of all available channels is possible in multiple bands. STR EMLMR grants an incredibly high level of flexibility and minimal signaling, which is ideal for reducing latency, ensuring communication robustness, and enabling determinism. PHY Enhancements Alongside MLO, IEEE 802.11be boasts a wide range of PHY enhancements. These include unique new features to combat interference, such as preamble puncturing and major shifts in spectrum/channel bandwidth availability. Multiple Resource Units (MRU) Wi-Fi 7 also allows more than one resource unit (RU) to be assigned to a single station. The result is increased throughput, improved interference immunity, and more optimal spectrum use. This pairs with orthogonal frequency- division multiple access (OFDMA) and further reduces multi- user latency by a predicted 25 percent. Preamble Puncturing Preamble puncturing, or just puncturing, is a feature of MRU that allows for selective puncturing of overlapping spectrum portions. This ensures that the data transmitted is only sent along clear frequency channel portions, which enables enhanced data rates and increased reliability in congested environments. Wider Channel Bandwidths and New Spectrum The new spectrum opened by Wi-Fi 6E is further employed by Wi-Fi 7 with channel bandwidths extended to 320MHz. This is double the Wi-Fi 6/6E support of 160MHz channel bandwidths, though Wi-Fi 7 still supports these 160MHz modes. Higher Order Modulation (4096-QAM) The modulation complexity for Wi-Fi 7 is dramatically increased over Wi-Fi 6. With Wi-Fi 6, the modulation depth is 1024-QAM (1K QAM). Wi-Fi 7 increases this to 4096-QAM (4K QAM). Though increased modulation complexity can lead to greater susceptibility to noise and phase noise, it also allows for much higher data rates. Additional Spatial Streams The maximum spatial stream capability for Wi-Fi 7 is also being increased to sixteen, which is double that of Wi-Fi 6. With up to sixteen spatial streams, 4K QAM, and 320MHz channel bandwidths in the 6GHz spectrum, Wi-Fi 7 could reach maximum client speeds of 46Gbps.