How Does Bluetooth Quietly Connect Our World?

A diagram visualizing how bluetooth connects different devices.

In an era of future-forward technology, such as self-driving cars and exponentially growing AI capabilities, we rarely stop and wonder at the simple technologies and concepts that they were built upon to make these innovations happen. We are surrounded by one all the time, often using it without thinking twice to help communicate with others and listen to our favorite songs. Bluetooth, named after a Viking king, has helped people communicate since the 1990s. Starting in the form of radio, Bluetooth has now branched out into other forms as well. It’s helped us communicate around the world and through invisible waves beyond human eyesight.

This wireless technology uses radio waves, or electromagnetic waves,  on a specific frequency band to communicate. For example, the 2.4 to 2.483 GHz band is specifically set aside for medical and scientific devices. To initiate a connection between two devices on that band, we must first pair the devices. Almost like introducing two people, the devices acknowledge each other and “agree to communicate.” After that, the playing device will send electromagnetic waves to the receiving device, establishing a wireless connection! Unlike Wifi, another form of wireless connection, bluetooth is able to connect these devices without the use of internet. The connection is called a piconet, a personal area network that is the range of the two paired devices. In the piconet, the devices will be on the same frequency band to lower interference between other Bluetooth devices.

Pairing is also significant in ensuring security. Pairing provides the devices with security keys, so without being paired first, the devices won’t be able to connect to eachother.. The security keys also help protect data and information so that other devices will not be able to read it without the key. This feature protects users for having their data tracked or leaked during or after the bluetooth connection. Some devices may even require a coe for initial paring to provide authentication, usually by a number or pressing a verification button. While these precautions usually taake care of safety, it can still be prone to hacking without further assistance.

As of now, there are 2 types of Bluetooth: Low Energy (LE) and Classic (BR). Although both operate on the 2.4 GHz band, the Bluetooth LE tends to consume less energy, has a higher range, and has unlimited nodes or connections. Some devices with Bluetooth LE are smart home applications, medical/industrial devices, or even Fitbits. Bluetooth BR is found in more basic functions, such as regular headsets, streaming applications, or transferring files, connection that consume less data.Bluetooth BRt still doesn’t consume too much energy, but is limited to 7 nodes and a range of 30 meters or less.

A timeline of bluetooth versions from 1999 up to 2016.

In just 28 years, Bluetooth has split and emerged in new ways. From Bluetooth 4.0, the version that brought the low power conservation we still see today, to today’s version 6.0, many improvements have been made within the field that has revolutionized the usage of Bluetooth. With 6.0, we have enhanced ranging,security, and accuracy, and well as a enhanced “find my” network. This comes in handy in supporting another feature- Bluetooth 6.0’s ability to constantly track devices. Connected devices send out signals, called advertising packets, constantly, allowing them to be tracked via Bluetooth. Your phone, AirPods cases, and even your Fitbit are all devices that send out constant advertising packets. In the past, this process was highly energy-consuming, but now in Bluetooth 6.0, even if the advertising packet is sent hundreds of times, the host device tracking it will only get it once, reducing the amount of repeated input and energy used.

So, what can we expect to see in the future? Bluetooth improvement mainly focuses on being more accurate, faster, and having a larger range. Currently, in apps such as Life 360 and Find My, the object could be located within a range of a few meters, without a precise location. By improving Bluetooth accuracy, we could be able to locate our items exactly where they are, with only a few centimeters of variation. Safe Bluetooth is also a field we can expect improvement in, with better verification and locks, hacking into networks will be harder, and safer for those who use it. With accuracy and safety comes less lagging from monitor to headset, smoother data displays, and improved efficiency.

In a world where technology is surpassing what we knew before, Bluetooth is growing with it. What was once a way to hear the local news and music, Bluetooth connects us all beyond simple communication and is a vital part of everyone’s lives. As Bluetooth continues to grow into new versions, it will shape the way we connect with others and interact with devices. It remains as one of the most influential wireless technologies, and although we can’t see it, we can feel its effect on our lives.