Wi-Fi 7 Multi-Link Operation (MLO): benefits, connection modes, and applications
Wi-Fi 7 (IEEE 802.11be) introduces Multi-Link Operation (MLO), a technology that significantly enhances wireless network speed, reduces latency, and improves stability. MLO allows devices to connect to multiple frequency bands simultaneously (such as 2.4 GHz, 5 GHz and 6 GHz) and dynamically allocate traffic based on network conditions, ensuring data transmission is no longer limited to a single band.
For example, in a household scenario where a father is streaming an 8K movie in the living room, a mother is conducting a video conference in the study, a child is playing VR games in their room, and various IoT devices are operating in the background, MLO ensures optimal connectivity. The television can use the 6 GHz band for high throughput, the laptop can rely on the 5 GHz band for stable video conferencing, and the VR headset can switch between the 5 GHz and 6 GHz bands to minimize latency and avoid congestion, ensuring a seamless experience for all devices.
MLO has the following five connection modes:
MLO Connection Modes (Table 1)
If a particular frequency band experiences interference, the eMLSR function in MLO can transmit data through alternative links, enhancing reliability. Imagine a busy coffee shop where 30 customers are using Wi-Fi simultaneously for file downloads, live streaming and mobile gaming. If the 5 GHz band becomes unstable due to nearby Wi-Fi interference, MLO can automatically switch affected devices to the 6 GHz band, ensuring uninterrupted streaming and gaming experiences. MLO also effectively reduces latency, making it ideal for VR/AR, cloud gaming, and real-time applications. For instance, a player using cloud gaming and AR applications at home benefits from MLO by using the 6 GHz band for gaming to ensure low-latency visuals while AR applications run stably on the 5 GHz band. Even with background device activity, the experience remains seamless.
This document presents experimental results for products currently available on the market that support eMLSR. Both the access point (AP) and connected stations must support eMLSR; otherwise, the function cannot be activated. In this study, all tested products support eMLSR, and the connected station uses Intel BE200. The tests were conducted using Allion Wireless Equipment (AWE) under controlled conditions with added interference signals to simulate real-world disruptions. Throughput and latency variations were analyzed to compare performance.
Figure 1 Allion Wireless Equipment (AWE)
Allion uses AWE equipment to verify the eMLSR functions and performance of APs from major manufacturers on the market, ensuring the stability and reliability of APs under the same test conditions. Through detailed measurement data analysis, it is possible to deeply explore the performance of key indicators such as throughput and latency.
Measurement Results Analysis
This article focuses on the link switching behavior of each AP before, during, and after interference, and analyzes the following three indicators:
- Observe whether the eMLSR link switching performs properly
- Check whether Latency and Maximum Latency are too high
- Observe whether the overall throughput can provide the best performance under different interference conditions
Figure 2. Brand E Throughput Results
- Before interference: AP and Station established a connection on the 6 GHz band, achieving a maximum throughput of 2200 Mbps (Downlink + Uplink).
- After interference: It took 3 seconds to switch from 6 GHz to 5 GHz, reducing throughput to 1000 Mbps.
- After interference removal: The device switched back to 6 GHz after 69 seconds, restoring throughput to pre-interference levels.
Figure 2: Throughput results of Brand E
Figure 3. Brand E Latency Results
- Before interference: Latency remained under 10 ms.
- After interference: At 64th second, the system switched to 5 GHz, causing latency to rise to a maximum of 30.07 ms before stabilizing at 10 ms after returning to 6 GHz.
Figure 3 Latency results of Brand E
Comparative Analysis
Figure 4 is a comparison of the the AP mentioned above, and integrating the A brand and B brand APs results from the Allion WiFi 7 AP result database. For the three AP Max Latency, the green color is for E brand AP, yellow color is for B brand AP, and blue color is for A brand AP. Figure 4 shows the Max Latency in the AP to Station direction. It can be observed that the Max Latency of the E brand AP does not change much in the three states, and the performance is stable. The B brand AP has a significant increase in latency in Interference Off, and the Interference On latency is the lowest. Before Interference On, the Max Latency of the A brand AP is lower overall. Figure 4 bottom shows the Max Latency in the Station to AP direction. The E brand AP does not change much in the three states, and the performance is stable. The B brand AP has a higher Max Latency in Interference On and Interference Off, and the A brand AP’s Max Latency is still lower overall.
Figure 4 Max latency comparison chart
Figure 5 shows the throughput performance of the three APs. Before Interference On, the best Throughput value is 3802 Mbps for Brand A, followed by 3620 Mbps for Brand B, and finally 2092 Mbps for Brand E. Under Interference On, the best Throughput value is 3152 Mbps for Brand A, followed by 1056 Mbps for Brand E, and finally 940 Mbps for Brand B. Under Interference Off, the best Throughput value is 3750 Mbps for Brand A, followed by 1617 Mbps for Brand E, and finally 982 Mbps for Brand B.
In summary, after being interfered with and the eMLSR function is enabled, Brand A AP can maintain good Throughput performance, while the other two APs cannot maintain good Throughput performance after being interfered with and the eMLSR function is enabled.
Figure 5 Throughput comparison chart
Conclusion
Based on these results, Brand A outperformed Brand B and Brand E in overall efficiency.
The eMLSR technology in Wi-Fi 7 MLO enhances throughput and minimizes latency during interference, significantly improving user experience. This feature is expected to become more prevalent in future APs and stations. Manufacturers should evaluate their eMLSR performance to maintain competitive advantages.
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