Shulou(Shulou.com)12/24 Report--

Thanks to CTOnews.com netizen OC_Formula for the clue delivery! CTOnews.com, December 11, although the Wi-Fi 7 standard has not been officially frozen, major manufacturers have launched consumer-grade products based on the draft of Wi-Fi 7. It is believed that many CTOnews.com partners have experienced a series of convenience brought by Wi-Fi 7.

The WiFi Alliance now announces that it will participate in CES 2024 from January 9 to 12 next year, and confirms that the IEEE 802.11be-based Wi-Fi CERTIFIED 7 certification standard will be officially launched by the end of the first quarter.

To put it simply, Wi-Fi 7 introduces many new technologies based on the Wi-Fi 6 standard. The main advantages are as follows:

Higher throughput

Improved support for deterministic delay

Efficiency can be improved even in dense networks

Greater Robustness and reliability

Lower power consumption

The goal of Wi-Fi 7 is to further improve the data throughput of WLAN networks and provide access guarantee with low latency.

In order to meet this goal, the whole protocol has been changed in both PHY layer and MAC layer. Compared with Wi-Fi 6 protocol, the main technological changes brought about by Wi-Fi 7 protocol are as follows:

Support for maximum 320MHz bandwidth 2.4GHz and 5GHz band unlicensed spectrum is limited and congested, the existing Wi-Fi will inevitably encounter the problem of low QoS when running new applications such as VR / AR. In order to achieve the goal of maximum throughput improvement, Wi-Fi 7 will continue to introduce the 6GHz band and add new bandwidth modes, including continuous 240MHz, discontiguous 160+80MHz, continuous 320MHz and discontiguous 160+160MHz, thus providing twice the throughput of Wi-Fi CERTIFIED 6.

Support Multi-RU mechanism in Wi-Fi 6, each user can only send or receive frames on the assigned specific RU, which greatly limits the flexibility of spectrum resource scheduling. To solve this problem and further improve the spectrum efficiency, Wi-Fi 7 defines a mechanism that allows multiple RU to be allocated to a single user. Of course, in order to balance the complexity of implementation and the utilization of spectrum, there are some restrictions on the combination of RU in the protocol, that is, small-size RU (RU smaller than 242-Tone) can only be combined with small-size RU, and large-size RU (RU greater than or equal to 242-Tone) can only be combined with large-size RU, and mixed use of small-size RU and large-size RU is not allowed.

The highest modulation mode of introducing higher-order 4096-QAM modulation technology Wi-Fi 6 is 1024-QAM, in which the modulation symbol carries 10bits. In order to further increase the rate, Wi-Fi 7 will introduce 4096-QAM to enable modulation symbols to carry 12bit. Under the same encoding, the 4096-QAM of Wi-Fi 7 can get 20% faster than the 1024-QAM of Wi-Fi 6.

Introducing Multi-Link multilink mechanism to achieve efficient utilization of all available spectrum resources, there is an urgent need to establish new spectrum management, coordination and transmission mechanisms on 2.4GHz, 5 GHz and 6 GHz. The working group defines the related technologies of multi-link aggregation, including enhanced multi-link aggregation MAC architecture, multi-link channel access and multi-link transmission and other related technologies.

Support for collaborative scheduling among multiple AP is currently within the framework of the 802.11 protocol, and there is actually not much collaborative relationship between AP. Common WLAN functions such as automatic tuning and intelligent roaming are customized by manufacturers. The purpose of inter-AP cooperation is only to optimize channel selection and adjust the load between AP in order to achieve efficient utilization and balanced allocation of radio frequency resources. Multi-AP cooperative scheduling in Wi-Fi 7, including inter-cell coordination planning in time domain and frequency domain, inter-cell interference coordination, and distributed MIMO, can effectively reduce the interference between AP and greatly improve the utilization of air-port resources.

There are many ways of cooperative scheduling among multi-AP, including C-OFDMA (Coordinated Orthogonal Frequency-Division Multiple Access), CSR (Coordinated Spatial Reuse), CBF (Coordinated Beamforming) and JXT (Joint Transmission).

Wi-Fi 7 application scenario Wi-Fi 7 introduces new features that will greatly increase data transfer rates and provide lower latency, and these advantages will be more helpful to emerging applications, as follows:

Video stream

Video / voice conferencing

Wireless games

Real-time collaboration

Cloud / Edge Computing

Industrial Internet of things

Immersive AR / VR

Interactive telemedicine

Related readings:

"Wi-Fi 7 domestic standards are about to land! The Ministry of Industry and Information Technology solicited the approval of the equipment, and the measured network speed reached 4.3Gbps. "

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