Wi-Fi Sharing: How a Router Shares the Internet and How to Optimize It

Have you ever noticed that your smartphone's internet speed drops when someone at home starts watching a 4K movie on their TV? Or why does your laptop suddenly slow down during a Zoom conference, even though your router shows a stable connection? It's not your ISP or a "bad" signal—the problem lies in How a router distributes Wi-Fi between devicesThis system operates according to strict algorithms that most users are unaware of.

In a home network with 5-10 gadgets—from smart light bulbs to gaming consoles—the router is constantly forced to "decide" how much traffic to allocate to whom. And this decision isn't always optimal. In this article, we'll look at technical mechanisms Wi-Fi distribution (including little-known protocols like 802.11e And WMM), we will explain why some devices are given priority over others and show How to manually configure a router, to avoid "fighting" for the channel. You will learn what it is airtime fairness, how packet queues work, and why even the most expensive router won't save you from lag if you don't take these nuances into account.

Spoiler alert: the solution isn't always buying new hardware. Often, changing a couple of settings in the router's admin panel is enough to stop your smartphone from choking on data while your TV downloads an update.

How a router "sees" connected devices: basic principles

When you turn on Wi-Fi on your smartphone or laptop, the router doesn't just "give access" to the network - it registers the device in its internal table, assigning it unique parameters: MAC address, supported standards (802.11n/ac/ax), maximum connection speed and even traffic type (e.g., videos, games, or background updates). This table forms the basis for further resource allocation.

It's important to understand that a router doesn't share the internet equally between devices. Instead, it uses dynamic allocation, considering:

• 📶 Signal level each device (the weaker the signal, the longer it takes to transmit data).
• ⚡ Traffic type: Voice calls (VoIP) or online games are given priority over torrent downloads.
• 🕒 Airtime: how many milliseconds does the device take on the air to transmit packets.
• 🔄 Connection protocol: devices on Wi-Fi 6 (802.11ax) can process more data in the same amount of time than gadgets on Wi-Fi 4 (802.11n).

For example, if the following are connected to the router:

• 📱 Smartphone (Wi-Fi 5, weak signal, downloading update)
• 💻 Laptop (Wi-Fi 6, strong signal, broadcasting a Zoom conference)
• 🎮 Prefix (Wi-Fi 4, average signal, plays an online shooter)

the router will give priority laptop (due to protocol Wi-Fi 6 and type of traffic), then prefix (Games are sensitive to latency), and the smartphone will receive the remaining bandwidth. And this is even if all devices are connected to the same network!

Traffic Distribution Algorithms: Who Gets More?

Modern routers use several algorithms to manage traffic. The main ones are:

1. Round Robin (RR) — the simplest method, in which the router sends packets to each device in turn. Problem: slow devices (for example, on Wi-Fi 4) slow down the entire network, as they take up more airtime.
2. Weighted Fair Queuing (WFQ) — distributes traffic based on the device's "weight" (priority). For example, Zoom calls will receive more resources than background cloud sync.
3. Airtime Fairness - a revolutionary approach in which the router allocates air time, not the amount of data. This means that slow devices won't be able to clog the channel: they'll get the same amount of milliseconds for transmission as fast ones.

A critical detail: the Airtime Fairness algorithm is only available on routers with firmware that supports Wi-Fi 5 (802.11ac) and newer. If your router is older than 2015, it likely uses the outdated Round Robin algorithm, which artificially limits newer devices to older ones.

How can I check which algorithm my router is using? Log into the admin panel (usually at 192.168.1.1 or 192.168.0.1) and find the section Wireless → Advanced Settings or QoSIf there is an option there Airtime Fairness — You're lucky. If not, your router most likely uses Round Robin.

Why some devices slow down others: real-life examples

Let's consider a typical situation: the following are connected in the house:

• 🖥️ Gaming PC (Wi-Fi 6, plays in Counter-Strike 2)
• 📺 Smart TV (Wi-Fi 5, watches Netflix in 4K)
• 📱 Smartphone (Wi-Fi 4, downloading iOS update)
• 💡 Smart light bulb (Wi-Fi 2.4 GHz, sends telemetry)

What's happening online:

1. Gaming PC requires low ping (delays), but not much traffic.
2. Smart TV is taking over maximum throughput for streaming video.
3. Smartphone on Wi-Fi 4 slows down the entire network, since the router is forced to wait until it processes the packets.
4. The light bulb has almost no effect on speed, but it does create background noise.

As a result:

• ❌ Appear in the game lags (ping jumps up to 200 ms), although the speed seems to be high.
• ❌ Netflix starts slow down, since the smartphone “takes away” resources.
• ✅ The light bulb works reliably (it needs almost nothing).

Solution? Turn on QoS (Quality of Service) in the router settings and manually set priorities:

High Priority: Gaming PC, Smart TV
Medium: Smartphone
Low: Smart devices (light bulbs, sensors)

How to Manually Configure Wi-Fi Sharing: A Step-by-Step Guide

To optimize traffic distribution, follow these steps (the instructions are universal for most routers) ASUS, TP-Link, Keenetic, MikroTik):

Open the router admin panel (192.168.1.1 or 192.168.0.1)|

Go to Wireless → Advanced Settings|

Enable Airtime Fairness (if available)|

Configure QoS (Quality of Service) by priority|

Separate devices by bands (2.4 GHz and 5 GHz)|

Save settings and reboot the router-->

Let's look at each point in more detail:

1. Enabling Airtime Fairness
   

   Find the option in the section Wireless → AdvancedOn routers ASUS it can be called Enable Airtime Fairness, on TP-Link — Fair Access PolicyAfter turning on, the router will start distributing air time, and not the amount of data, which will eliminate the “slowdowns” of older devices.

2. Setting up QoS (Quality of Service)
   

   QoS allows you to manually prioritize traffic. For example, Keenetic the path will be like this: Internet → QoS Rules. Create rules:

   Priority 1 (High): UDP port 3074 (Games), TCP port 443 (Zoom)
   Priority 2 (Medium): TCP port 80/443 (web surfing)
   Priority 3 (Low): All other ports

3. Separating devices by ranges
   

   Devices on 2.4 GHz (smart bulbs, old smartphones) should not compete with gadgets on 5 GHz (laptops, TVs). Set up separate networks:

   SSID_2G (for IoT devices only)
   SSID_5G (for laptops, smartphones, TV)

/interface vlan
add interface=bridge name=vlan10 vlan-id=10
add interface=bridge name=vlan20 vlan-id=20

Advanced → Bandwidth Control → Rules
Add rule: Device IP → Max. speed (e.g. 5 Mbps)