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1. What is Bluetooth 5.1?
Put simply, Bluetooth 5.1 is the latest Bluetooth technology standard bringing forth a host of new improvements. Developed based on the current Bluetooth 5.0 standard, Bluetooth 5.1 technology not only enhances connection stability but also provides real-time data, including location and proximity sensing.
Exploring Innovations in Bluetooth 5.1
Bluetooth 5.1 brings forth a plethora of fresh improvements and is increasingly compatible with a wider array of devices. Essentially, this standard allows you to locate Bluetooth 5.1 devices and pinpoint their precise locations, with just a few inches of discrepancy. This is made possible by several enhancements in Bluetooth 5.1. Here are the key improvements you need to know about this wireless technology:
2.1. Direction Finding - Locating Device Positions
One of the major advancements of Bluetooth 5.1 is called 'Direction Finding', enabling Bluetooth devices to determine the direction of Bluetooth signal transmission. The current Bluetooth 5.0 utilizes signal strength to estimate distances with limited accuracy. The new Bluetooth 5.1 standard will employ a combination of two different methods to determine the angle at which the signal is transmitted, resulting in higher accuracy.
These methods are called Angle of Arrival (AoA) and Angle of Departure (AoD), requiring one of the communicating devices to have an antenna. Antennas are present in the receiving and transmitting devices when the AoA and AoD methods are respectively used. This new feature allows the Bluetooth Low Energy (LE) controller in the receiving device to generate a dataset used to calculate the directional angle between the transmitting and receiving devices.
Developers can utilize this directional angle information to create Bluetooth-based positioning systems, including Real-Time Location Systems (RTLS) and Indoor Positioning Systems (IPS). The benefits in daily life that the Direction Finding improvement brings are beyond imagination. Essentially, it enables users to track Bluetooth 5.1-enabled devices to within a few inches of their actual location. Hence, in the future, if you misplace your wireless earbuds, you can swiftly locate the device.
2.2. GATT Caching - Enhancing Connection Stability and Battery Life
All devices supporting BLE (Bluetooth Low Energy) connections use the Generic Attribute Profile (GATT) common configuration to establish connections with each other. All GATT devices have a database called the attribute table, which includes device identification information such as GATT services, characteristics, information, and values of the description structure. When a Bluetooth device establishes a connection with another device, it sends a request to search for services to gather these attributes and use them to establish this connection.
In the current Bluetooth 5.0 standard, this service search request consumes a lot of time and energy, resulting in weak connections and higher power consumption. With Bluetooth 5.1, the attribute cache has been improved, allowing untrusted clients to retain attribute caches through connections, enabling devices to bypass the search and connection establishment process.
2.3. Bluetooth Advertising - Enhancing Scalability, Reliability, and Power Efficiency
Two main enhancements related to Bluetooth Advertising features are presented below:
3. Random Advertising Channel Indexing
Note: Advertising is the fundamental data broadcasting activity of BLE devices into the surrounding environment before connection.
Today, we are surrounded by interconnected devices, mostly utilizing the same radio channel, often causing connection issues. Although Bluetooth is entirely different from Wi-Fi, the basic concept applies similarly in this case. This means that in an area with too many Bluetooth-connected devices broadcasting connection identification data, they will interact and cause connection errors. Bluetooth 5.1 addresses this issue in the Bluetooth Advertising enhancement.
4. Periodic Synchronized Advertising Transmission
The current Bluetooth 5.0 standard comes with the 'SyncInfo' feature, allowing Bluetooth devices to synchronize their broadcast and scanning schedules. This means a master device and a slave device synchronize with each other for the master device to broadcast connection identification data simultaneously when the slave device requests a connection. This reduces power consumption significantly as both devices transmit data packets simultaneously, minimizing connection establishment requirements.
Bluetooth 5.1 enhances this feature by introducing the new technology Periodic Advertising Sync Transfer (PAST), allowing devices to share this connection data with each other. For instance, if my smartphone has established a connection with the TV, it can share that connection with a smartwatch to avoid consuming power for a similar task. This improvement is particularly useful for Bluetooth LE devices like smartwatches, smart bracelets with limited battery capacity.
Currently, most computers have Bluetooth connectivity, however, there are many cases where Bluetooth malfunctions and doesn't work. If you encounter such a situation, refer to how to fix Bluetooth issues such as not working, not connecting, or not turning on in Windows computers.
