How Wi-Fi Sharing Works Between Devices: From Theory to Practice

Have you ever wondered why your smartphone loads YouTube videos without any lag, while your laptop struggles to handle web pages? Or why a game on PlayStation 5 it starts to lag when someone at home turns it on Netflix on Samsung Smart TVIt's not about "bad internet" - it's about How a router shares Wi-Fi between connected devicesThis traffic distribution system operates according to clear rules, but most users are unaware of its existence.

In this article we will figure out, What technologies are responsible for Wi-Fi sharing?, why some devices are prioritized over others, and how to manually configure your router to distribute internet bandwidth fairly. You'll learn what QoS, how it works MU-MIMO, and why even the most powerful router can throttle speeds on older devices. Plus, practical tips on how to avoid "traffic wars" on a multi-user network.

How a router "sees" connected devices: basic principles

When you turn on Wi-Fi on your smartphone or laptop, the router doesn't just "allow" the connection—it registers the device in its internal table and assigns it a unique MAC address. This address (for example, 00:1A:2B:3C:4D:5E) allows the router to distinguish your iPhone 14 from Sony PlayStation a neighbor's child who connected to your network "through connections."

But traffic distribution does not start with the connection, but with analysis of the device type and its needsModern routers (for example, ASUS RT-AX88U or TP-Link Archer AX6000) classify gadgets according to several criteria:

• 📱 Device type: smartphone, laptop, TV, game console or smart speaker. For example, Amazon Echo will receive minimal traffic, as it only requires voice commands.
• 🔄 Online activity: downloading torrents, streaming videos in 4K, online gaming or simple web browsing.
• 📡 Connection protocol: Wi-Fi 4 (802.11n), Wi-Fi 5 (802.11ac) or Wi-Fi 6 (802.11ax). Supported devices Wi-Fi 6 receive priority.
• 🔋 Signal level: If your laptop is in another room with a weak signal, the router may artificially limit its speed to avoid overloading the network.

Interesting fact: some routers (for example, Keenetic or MikroTik) they can recognize device models according to them MAC address and automatically assign priorities to them. For example, Apple iPad Pro with a chip M2 will get more traffic than the old one Samsung Galaxy S8, even if both are just checking email.

Traffic Distribution Technologies: QoS, MU-MIMO, and Band Steering

If the router simply divided the Internet "equally" between all devices, then even at a speed 1 Gbps You would experience lag. For example, one device is downloading an update. Windows 11 (5 GB), and the second one is trying to watch a movie on Kinion - and both get 500 MbpsBut you can watch the film even when 25 Mbps, but the update will take forever to download. To avoid such situations, special mechanisms are used.

1. QoS (Quality of Service) - "smart" prioritization

This is a system that analyzes traffic type and assigns it a priority. For example:

• 🎮 Gaming traffic (Call of Duty, Fortnite) — the highest priority, since even micro-delays (ping > 50 ms) spoil the gaming experience.
• 🎥 Video streaming (Netflix, YouTube) - high priority, but with a bitrate limitation (for example, not higher than 4K@60fps).
• 📥 File sharing (torrents, cloud downloads) - low priority to avoid clogging the channel.
• 📞 Voice calls (Zoom, WhatsApp) is a critical priority, since even with a weak internet connection it is important to maintain connection.

2. MU-MIMO (Multi-User Multiple Input Multiple Output) – parallel operation with several devices

Old routers (Wi-Fi 4) could only communicate with one device at a time, even if 10 gadgets were connected to the network. Technology MU-MIMO (available in Wi-Fi 5 and newer) allows the router transmit data to multiple clients simultaneously. For example:

• 🖥️ The laptop is downloading the update.
• 📺 The TV is broadcasting a movie.
• 🎮 The console plays FIFA 23.

All three devices receive data parallel, rather than one at a time. This reduces latency and increases overall network throughput.

3. Band Steering – automatic switching between frequencies

Many routers operate on two frequencies: 2.4 GHz (long range but low speed) and 5 GHz (high speed, but weak signal through walls). Technology Band Steering Automatically connects devices to the optimal frequency. For example:

• 📱 iPhone 13 next to the router → connects to 5 GHz.
• 💻 Laptop in another room → stays on 2.4 GHz, so as not to lose touch.

Why can QoS slow down the internet?

If there are too many QoS rules or they are configured incorrectly, the router wastes CPU time analyzing each packet. As a result, the overall network speed drops by 10-30%. This is especially noticeable on budget routers with a weak chipset (for example, TP-Link TL-WR840N).

Why does the speed drop when new devices are connected?

Have you ever noticed that your internet connection is lightning fast at night, but barely manageable during the day? Or that your laptop's speed drops when someone connects to their smartphone? There are several reasons, and most of them are related to incorrect router configuration or equipment limitations.

1. Limited channel capacity

Let's say your tariff is - 100 MbpsIf connected to the network:

• 🖥️ Laptop (downloads file at speed 50 Mbps).
• 📱 Smartphone (looks YouTube V 1080p — 10 Mbps).
• 🎮 Console (plays in GTA Online — 20 Mbps).

There's only left 20 Mbps to other devices. If at this point someone turns on the update Windows, everyone's speed will drop.

2. Competition for the radio channel

In apartment buildings, Wi-Fi networks of neighboring routers overlap each other, especially at frequency 2.4 GHzIf your router and 5 neighboring routers are operating on the same channel (for example, 6), the speed will drop even under light load. Solution - manually select the least loaded channel in the router settings.

3. Old devices "slow down" new ones

If a device with the Wi-Fi 4 (802.11n) standard is connected to the network, it forces all other gadgets to work at its speed, even if they support Wi-Fi 6. For example, an old printer HP LaserJet or a smart light bulb Xiaomi Mi Home may reduce speed for MacBook Pro or iPad Air.

How to manually configure traffic priorities (QoS)

If the automatic settings of your router do not suit you, you can set priorities manually For devices or traffic types. Let's look at the configuration using popular router models as an example.

1. Configuring QoS on ASUS routers

Go to the control panel (192.168.1.1), go to the section Adaptive QoS:

1. Select the connection type (Game, Media Streaming, Web Surfing).
2. In the section Bandwidth Limiter we specify the maximum speed for each device (for example, 50 Mbps for torrents).
3. Let's turn it on Traditional QoS and set priorities manually (for example, PlayStation 5 — highest priority).

2. Setting up QoS on TP-Link

On the menu Advanced → QoS → Settings:

1. Let's turn it on QoS and we choose Upload/Download Bandwidth (we indicate the actual speed of your tariff, and not the one promised by the provider).
2. In the section QoS Rules add rules for MAC addresses devices or ports (for example, port 3074 For Xbox).
3. Save the settings and reboot the router.

3. Setting up on Keenetic

IN Keenetic QoS is configured through the section Traffic priorities:

• 🔧 Let's choose Automatic mode (for beginners) or Manual mode (for advanced).
• 📊 Specify the speed of the Internet channel (you can check it on Speedtest.net).
• 🎯 Add devices to priority lists (for example, Smart TV - high, smart vacuum cleaner - short).

Table: Comparison of Wi-Fi Distribution Technologies

If your router supports Wi-Fi 6, but the devices are not, then technologies like OFDMA or MU-MIMO won't give any speed increase. In this case, it makes sense disable these features in the settings so that the router does not waste resources on processing them.

What to do if Wi-Fi is slow on one device

Sometimes the problem is not with the router, but with a specific gadget. Here step-by-step diagnostic plan:

1. Check the speed on other devices

If on iPhone speed 90 Mbps, and on Windows laptop — 5 MbpsThe problem is definitely with the laptop. If the speed is slow everywhere, it's the router or ISP's fault.

2. Update your Wi-Fi adapter drivers

On Windows:

1. Click Win + X → device Manager.
2. Find Network adapters → your Wi-Fi module (For example, Intel AX200).
3. Right click → Update driver → Automatic search.

On MacOS update the system via Settings → Software Update.

3. Check your power saving settings

On Windows:

1. Go to Control Panel → Power Options.
2. Select a scheme High performance.
3. IN Additional parameters find Wireless Network Adapter Settings and install Maximum performance.

4. Change the Wi-Fi channel manually

If the router automatically selects a busy channel, speed will drop. How to change:

1. Go to your router settings (192.168.1.1).
2. Find the section Wireless Settings or Wireless network.
3. Change it Channel on 1, 6 or 11 (For 2.4 GHz) or any channel in the range 36-165 (For 5 GHz).
4. Save and reboot the router.

Hidden router settings that affect Wi-Fi distribution

Many users don't even know that their router has hidden parameters, which can be modified to optimize the network. Here are the most useful ones:

1. Setting up Beamforming (beam forming)

This technology allows the router route the signal directly to the device, rather than scattering it in all directions. How to turn it on:

• On ASUS: Wireless → Professional → Enable Beamforming.
• On TP-Link: Advanced → Wireless → Beamforming.

After turning it on, check the speed on devices that are far from the router.

2. Changing the channel width (Channel Width)

The wider the channel, the higher the speed, but the more interference from neighboring networks. Optimal settings:

• 📶 2.4 GHz: install 20 MHz (more resistant to interference).
• 📶 5 GHz: install 40 MHz or 80 MHz (if there are few networks nearby).

3. Disconnection WMM (Wi-Fi Multimedia)

This feature should improve multimedia performance, but in practice it often creates unnecessary delaysTry disabling it in the settings. Wireless → Advanced and check if the network has become more stable.

4. Setting up DTIM Interval

This setting determines how often the router sends "notifications" to devices in sleep mode. The default setting is 3, but if there are a lot of gadgets on the network (for example, a smart home), install 1 or 2 for lower delays.

What's happened AirTime Fairness?

This feature (available on routers) Ubiquiti, Ruckus) does not distribute speed, but channel access timeFor example, an old device with Wi-Fi 4 It won't clog up your airtime, taking up too much of it. It can be enabled in the settings. Wireless → Advanced.

FAQ: Frequently asked questions about Wi-Fi sharing

Is it possible to limit the speed for a specific device?

Yes, this can be done through the settings. QoS or Bandwidth Control in the router panel. For example, on TP-Link go to Advanced → Bandwidth Control and add a rule for MAC addresses devices by specifying the maximum speed (for example, 10 Mbps).

Why is Wi-Fi faster on one device than on another?

There are several reasons:

• 📱 The devices support different Wi-Fi standards (for example, iPhone 13 With Wi-Fi 6 it will be faster Samsung Galaxy S9 With Wi-Fi 5).
• 📡 Different number of antennas (laptop with 2x2 MIMO slower than a smartphone 4x4 MIMO).
• 🔋 Different signal levels (devices further from the router receive lower speeds).

How do I check which devices are connected to my Wi-Fi?

There are several ways:

1. From the router panel: go to the address 192.168.1.1 (or 192.168.0.1) and find the section DHCP Clients, Connected Devices or Local area network.
2. Via mobile apps: Fing (Android/iOS) or WiFi Guard.
3. Through the command in Windows: open Command line and enter

   arp -a

   (will show all IP and MAC addresses on the network).

Is it possible to make one device always have the maximum speed?

Yes, for this:

1. Turn on QoS in the router settings.
2. Add MAC address devices to the high priority list.
3. Limit the speed for other devices (for example, to 50 Mbps).

On routers ASUS this is done in the section Adaptive QoS → Bandwidth Limiter.

Why does everyone's speed drop after connecting a new device?

Possible reasons:

• 🔌 The new device has started a background update (for example, Windows Update or downloading the game on PlayStation).
• 📡 The device operates on an outdated standard Wi-Fi 4 and "slows down" the entire network.
• 🔋 The router has reached its connection limit (on budget models, the maximum is 10-15 devices).

Solution: Check the new device's activity in your router settings and limit its speed if necessary.

Now you know, How a router distributes Wi-Fi between devices, and you can optimize the network to suit your needs. If after all the adjustments the speed is still unsatisfactory, the problem may be with your provider's plan or the router itself—modern standards (Wi-Fi 6E, OFDMA) require powerful hardware, and old TP-Link TL-WR740N simply won't cope with the load.