What is Wi-Fi 7 MLO and How Does it Work

Wi-Fi 7 MLO is the latest generation of Wi-Fi technology, designed to provide faster and more reliable connections. It uses Multi-Link Operation (MLO) to combine multiple wireless links into a single, high-speed connection.

Wi-Fi 7 MLO can achieve speeds of up to 30 Gbps, making it ideal for applications that require high-bandwidth data transfer, such as 8K video streaming and online gaming.

With MLO, devices can use multiple wireless links simultaneously, increasing overall network capacity and reducing latency. This is especially useful for devices that require high-bandwidth connections, such as smart home devices and IoT devices.

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MLO, or Multi-Link Operation, is a feature that enables devices to send and receive data across different frequency bands and channels simultaneously. This technology is a key part of Wi-Fi 7 and offers several benefits, including increased throughput, reduced latency, and improved reliability.

With MLO, Wi-Fi 7 access points and client devices can associate and exchange traffic on multiple bands or channels, allowing for higher throughput and reduced latency. This is achieved through the aggregation of multiple links, which helps to improve the overall performance of the network.

MLO has three main benefits: aggregation, steering, and redundancy. Aggregation allows the AP and client to use multiple links to exchange data, increasing throughput and benefiting applications like high-definition video conferencing. Steering dynamically steers clients to exchange data in the link where it can achieve better SLA for certain traffic flows. Redundancy sends the same data on multiple links, improving reliability and reducing the impact of packet drops.

The devices capable of performing multi-link operations are called Multi-Link Devices or MLD, with access points referred to as AP MLD and clients as Non-AP MLD. The MAC layer is split into two, with the upper MAC handling link-agnostic operations like association and security, and the lower MAC handling link-specific operations like beacons and control frames.

There are two sub-methods in MLMR: MLMR-STR (simultaneous Tx and Rx) and MLMR-nSTR (non-simultaneous Tx and Rx). MLMR-STR gets the maximum throughput, while MLMR-nSTR is synchronous and non-simultaneous, resulting in some air time being lost while waiting for the other link to free up.

Here are the three main MLO modes:

These modes offer various benefits, including increased throughput and improved reliability, making MLO a highly anticipated feature for Wi-Fi 7.

To use MLO, you'll need a STA and AP that both support WiFi 7 and MLO.

The 6 GHz band is not required for MLO, so you can still use it with WiFi 7 routers that only support one 2.4 GHz band and one or two 5 GHz bands.

MLO enables your devices to connect to all the WiFi bands at the same time, which is a big improvement over previous WiFi standards.

There are several single and multi-radio MLO modes available, including MLSR, EMLSR, and STR.

MLSR is a required mode for all AP and non-AP MLDs, while EMLSR and STR modes are mandatory for AP MLDs but optional for non-AP MLDs.

STR is currently widely supported by vendors, making it a great starting point for understanding MLO.

With MLO, your devices can select different links for different traffic types, and even start to watch for different congestion scenarios, which is a huge step forward for WiFi technology.

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MLO, or Multi-link Operation, is a key feature of Wi-Fi 7 that offers exciting promises for Wi-Fi connectivity. It's a glimpse into what 802.11bn might bring and a path forward for the next 8 to 10 years of Wi-Fi.

MLO improves latency and overall throughput through flow-level routing optimization. This feature is particularly beneficial for 11be single-radio STAs, as it allows for dynamic switching of active links to adapt to load/co-ex conditions.

Packet-level aggregation is another key feature of MLO that improves latency and peak performance. Packets of the same TID can be sent on one or more radios, helping to improve low-latency and peak throughput.

Cross-Wake-Up Signaling for Power-Saving is a feature that allows APs to indicate a buffering unit on a link that the STA is monitoring. This enables the STA to wake up the link using another link, reducing power consumption.

Fast Link-Transition is a feature that dynamically switches the active link(s) to adapt to load/co-ex conditions. This is beneficial for 11be single-radio STAs, as it helps to improve performance in different scenarios.

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Multi-Primary Channel Access is another feature that allows for simultaneous transmission on multiple channels. This can help to improve overall throughput and reduce congestion.

Shared Single Session Across Links is a feature that allows for a single BA session per TID, shared sequence number space. This enables single authentication and key derivation for unicast packets, and separate group keys for broadcast/groupcast packets.

Here are the main technical features of MLO:

WiFi 7 MLO mainly includes two modes: STR Mode and NSTR Mode.

STR Mode, also known as Simultaneous Transmit and Receive Operation, allows two or more links to work completely independently without interfering with each other.

NSTR Mode, or Nonsimultaneous Transmit and Receive Operation, does not allow simultaneous receiving and sending operations, and at a single time, all links can only receive or all links can send data.

Multiple MLO modes are supported by WiFi 7, with stations able to choose their operating mode based on their hardware capabilities and software thresholds.

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STR Mode is currently incorporated by most vendors, making it an excellent starting place for understanding MLO operations.

Support for MLSR mode is mandatory for all AP and non-AP MLDs, while support for EMLSR and STR modes is mandatory for AP MLDs but optional for non-AP MLDs.

These modes are influenced by various software thresholds, including bandwidth requirements, band preferences, RF congestion, and QoS.

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MLO introduces significant benefits for various use cases, including simultaneous use of multiple bands, which avoids interference on any single band.

In environments with heavy congestion, this feature is a game-changer, allowing devices to transmit and receive data over more than one band at the same time.

Improved throughput is another key enhancement of MLO, leveraging the combined capacity of multiple channels across different bands to enable higher aggregate throughput.

This makes Wi-Fi 7 ideal for bandwidth-heavy applications like video streaming, virtual reality, and online gaming.

Reduced latency is also a notable benefit, achieved by offloading traffic across multiple channels, particularly useful in gaming, video conferencing, or other apps that require real-time communication.

Better reliability and robustness are also guaranteed, as station MLDs can seamlessly switch to a less congested band without dropping the connection.

Here are some key benefits of MLO:

Link aggregation, another feature of Wi-Fi 7, also offers improved throughput by splitting data across multiple bands and radios.

This type of operation offers a balance of previous modes, with some additional benefits thrown in, making it a powerful tool for enhancing wireless connectivity.

Wi-Fi 7 mandates the support for WPA3 and Enhanced Open, along with Protected Management Frame (PMF), for clients to operate in 802.11be data rates and features like MLO.

Security is a top priority in Wi-Fi 7, with new AKMs (AKM 24 and 25) added for WPA3-Personal.

Beacon protection is required for both the AP and wireless clients in Wi-Fi 7.

To ensure security across all links in a multi-link association, MLO requires security to be established across all links.

This enhances the security of Wi-Fi networks and protects against cyberattacks.

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Wi-Fi 7 has several security features to protect against cyberattacks. These include mandatory support for WPA3 and Enhanced Open, which is based on OWE.

Protected Management Frame (PMF) is also required for clients to operate at 802.11be data rates. This helps to prevent unauthorized access to the network.

New AKMs (AKM 24 and 25) have been added for WPA3-Personal. This provides an extra layer of security for personal networks.

Beacon protection is also required for both the AP and wireless clients. This helps to prevent hackers from intercepting sensitive information.

With MLO, security needs to be established across all links of a multi-link association. This ensures that the entire network is protected, not just individual links.

Migration and Deployment can be a complex process, but it's essential to consider a few key points to ensure a smooth transition. Power considerations are crucial, as 802.3bt (UPOE) is the recommended power input for full operation of Wi-Fi 7 Access Points.

To put that into perspective, if you're using Cisco Wireless Access Points, you can still operate at lower power with 802.3at, but you'll have reduced functionality. This might be a concern if you're planning to use advanced features.

A multigigabit switching infrastructure is recommended to handle the increased throughput of Wi-Fi 7 Access Points. This will ensure a better user experience and prevent any potential bottlenecks.

Security requirements have also changed with the latest Wi-Fi generation. WPA3/Enhanced Open is now mandatory for the 11be rate and MLO, which is a significant departure from previous Wi-Fi standards.

To achieve similar wireless coverage for the 6 GHz network, you should review the current RF coverage of your 5 GHz network. If needed, performing a site survey to ensure uniform cell size for both 5 and 6 GHz cells is highly recommended.

Here are some key power and infrastructure considerations for Wi-Fi 7 deployment:

Cisco Wireless APs are a key component in delivering high-performance Wi-Fi 7 connectivity. Customer stories and technical demos are available to learn more about their capabilities.

Cisco Wireless APs are designed to support the latest Wi-Fi 7 standards, enabling faster and more reliable connections.

With Cisco Wireless APs, you can expect improved wireless connectivity and reduced latency. Customer stories highlight the benefits of implementing these APs in various environments.

Cisco Wireless APs are a great solution for businesses and organizations looking to upgrade their wireless infrastructure.

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Full-Band Mesh Systems offer a significant improvement in Wi-Fi 7 performance. They allow for a wider coverage area and can handle more devices simultaneously.

These systems are designed to work with the latest Wi-Fi 7 technology, which provides faster speeds and lower latency. Top Wi-Fi 7 mesh systems on Amazon are highly rated for their reliability and ease of use.

Full-Band Mesh Systems can support up to 12 simultaneous streams, making them ideal for large homes or offices with many devices. The top 5 best full-band Wi-Fi 7 mesh systems are available on Amazon.

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Multi-link operation is the most exciting promise in Wi-Fi 7, offering a glimpse into what 802.11bn has in store for the future.

It's a game-changer, setting the standard for how we access the internet.

Simultaneous transmit with synchronous mode is a key feature of MLO technology.

Client devices can start to watch for different congestion scenarios, making the internet experience more seamless.

Selecting different links for different traffic types is also a key benefit of MLO.

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In the real world, MLO is a game-changer for WiFi 7 devices that support both STA and AP.

STA and AP both need to support WiFi 7 and MLO for this technology to work.

MLO enables your devices to connect to all the WiFi bands at the same time, which is a huge advantage.

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STR Mode allows two or more links to work completely independently, without interfering with each other.

This means that multiple devices can send and receive data at the same time, without any issues.

In STR Mode, simultaneous transceiver operations are enabled, making it ideal for applications that require high-speed data transfer.

STR Mode is particularly useful for mesh networks, where multiple devices need to communicate with each other simultaneously.

For example, in a mesh network, one device can send data to another device while receiving data from a third device, all at the same time.

This level of independence and non-interference is crucial for ensuring reliable and efficient data transfer in complex network scenarios.

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In real-world use, MLO is a game-changer for devices that need to connect to multiple WiFi bands at the same time.

MLO requires STA and AP support for WiFi 7, which means your router and device need to be compatible with the latest WiFi standard.

With MLO, devices can connect to all available WiFi bands simultaneously, making it ideal for applications that require seamless connectivity.

Notice that the 6 GHz band is not required for MLO, so you don't need to worry about compatibility issues with this frequency.

Some WiFi 7 routers may only support one 2.4 GHz band and one or two 5 GHz bands, but MLO can still enable your devices to connect to all the available bands.

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Preamble Puncturing and Resource Unit are two key features that make Wi-Fi 7 a major upgrade over its predecessors. Preamble Puncturing allows access points to "carve out" or "puncture" a portion of channel width affected by interference, ensuring optimal Wi-Fi performance.

This feature is only supported for channel widths greater than 80 MHz, and it's a mandatory requirement for Wi-Fi 7 certification. Without Preamble Puncturing, a significant portion of channel width can be wasted due to interference.

Multiple Resource Unit (MRU) improves the OFDMA technology introduced in Wi-Fi 6 by allowing access points to assign multiple resource units to each wireless client. This removes the restriction of assigning only a single RU per client.

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Preamble Puncturing is a feature that allows access points to carve out a portion of channel width affected by interference, ensuring optimal Wi-Fi performance.

This feature is mandatory for Wi-Fi 7 certification and is only supported in channel widths greater than 80 MHz, not for 40 MHz channel width.

Without preamble puncturing, if an AP is operating in 80 MHz channel width and there's interference in one of the secondary channels, all secondary channels are wasted, losing 60 MHz of channel width.

With preamble puncturing in Wi-Fi 7, only the unusable channel is lost, and the remaining 60 MHz of channel width is used.

The Multiple Resource Unit (MRU) feature is a game-changer in Wi-Fi 7 technology.

This feature improves upon the OFDMA technology introduced in 802.11ax amendment/Wi-Fi 6, making it a mandatory feature for Wi-Fi 7 certification.

OFDMA allows multiple clients to transmit or receive from an access point at the same time by sharing available bandwidth, which helps in spectral efficiency and improves transmission latency.

In Wi-Fi 7, the restriction of assigning only a single Resource Unit (RU) to each wireless client is removed, allowing multiple resource units to be assigned to each wireless client.

This helps in increasing spectral efficiency.

By allowing multiple RUs to be assigned to each client, access points can serve more stations simultaneously during uplink and downlink transmissions.

This results in improved performance, especially at higher data rates, and reduces the protocol overhead.

The MRU feature is a significant upgrade from Wi-Fi 6, where some portions of the spectrum might be left unused and wasted.

Compressed Block Ack helps aggregate up to 512 MPDUs in a single Wi-Fi 7 frame, a significant increase from 256 MPDUs in Wi-Fi 6.

This feature improves performance, especially at higher data rates, and reduces protocol overhead.

The key benefit of increasing the aggregation is improved performance, especially at higher data rates, also reducing the protocol overhead.

4K QAM encodes the number of bits in a sub-carrier to 12 bits, introducing two new MCS rates MCS 12 and 13.

This introduces up to 20% higher data transmission rates, making it a valuable feature for Wi-Fi 7 certification.

However, 4K QAM requires a very high SNR of close to 42 dB, making it challenging to achieve in an open environment.

Clients have to be very close to the Access Point, within a few feet, to achieve high data rates with 4K QAM.

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The birth of full duplex WiFi is looking more and more likely. It's hard to argue that this isn't the case, as the technology is clearing the last hurdle needed to reach this promised land.

One key factor is the need for Asynchronous Multi-Link, Multi-Radio mode (aMLMR) to be supported by both stations in the Basic Service Set (BSS). This is what will have to happen in order to see full duplex mode happen.

Full duplex mode would allow devices to transmit on one frequency and receive on a second frequency, which is currently supported. However, it's uncertain whether we will see this happening in the wild.

Link aggregation in the unlicensed spectrum does come with a downside - if there is any loss of data in either of the transmitted frames, that data will have to be resent.

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Wi-Fi 7 MLO is built on the 802.11be standard, which promises a massive leap in performance, with speeds reaching up to 30 Gbps.

This is a significant increase from Wi-Fi 6, which topped out at around 9.6 Gbps. This means Wi-Fi 7 MLO can support more devices and applications simultaneously.

Wi-Fi 7 MLO uses a new technology called Multi-Link Operation, or MLO, to combine multiple Wi-Fi connections into a single, faster connection.