A Comprehensive Revelation of Bluetooth Beacon and Wi-Fi Positioning Technologies

Bluetooth beacon and Wi-Fi positioning technologies have the following differences:

Positioning Principles:

Bluetooth Beacon Positioning: It is based on signal strength for positioning. Bluetooth beacons continuously broadcast Bluetooth signals containing unique identification information to the surroundings. After a smart device enters the broadcast range of the beacon, it estimates the distance from the beacon by measuring the received signal strength, and then combines the position information of the beacon. Algorithms such as triangulation are used to calculate the precise position of the device. In addition, high-precision Bluetooth positioning technologies like Bluetooth Angle of Arrival (AOA) positioning determine the device's position by measuring the angle at which the Bluetooth signal arrives at the receiver.

Wi-Fi Positioning: There are mainly two methods. One is the "proximity method", that is, it is considered that the mobile device is located at the position closest to which hotspot or base station. The other is that multiple access points (APs) record the Received Signal Strength Indicator (RSSI) received by the mobile device. The core Wi-Fi network and its related applications collect and process this information, and use algorithms such as triangulation or fingerprint positioning to determine the position of the mobile device relative to the APs. The fingerprint positioning method requires recording the signal strengths of a large number of determined position points in advance to establish a database, and then comparing the signal strength of the newly added device with the database to determine its position.

Positioning Precision:

Bluetooth Beacon Positioning: Generally, the precision can reach 1 - 3 meters. When high-precision positioning technologies such as Bluetooth AOA are adopted, the positioning precision at the centimeter to decimeter level can be achieved.

Wi-Fi Positioning: The precision is relatively lower, usually 3 - 15 meters. Because Wi-Fi signals are easily interfered by the surrounding environment, such as obstacles like walls and furniture, as well as other wireless signals, which leads to unstable signal strength and affects the positioning precision.

Coverage Area:

Bluetooth Beacon Positioning: The transmission range of a Bluetooth beacon is usually between 3 - 15 meters, specifically depending on the transmission power of the device and the sensitivity of the receiving device. If a larger area needs to be covered, a large number of Bluetooth beacons need to be deployed.

Wi-Fi Positioning: The coverage range of Wi-Fi is relatively wider. The coverage radius of a Wi-Fi access point can reach dozens of meters or even hundreds of meters. In large places such as shopping malls and hotels, by deploying multiple Wi-Fi access points, a larger range of positioning coverage can be achieved.

Deployment Cost:

Bluetooth Beacon Positioning: It is necessary to deploy Bluetooth beacon devices and build a Bluetooth network, which increases the network construction and maintenance costs. In order to achieve a higher positioning precision, a sufficient number of Bluetooth beacons need to be densely deployed in the target area, which also increases the cost. However, the cost of Bluetooth hardware devices themselves is relatively low.

Wi-Fi Positioning: The existing Wi-Fi network infrastructure can be utilized, and there is no need to lay additional dedicated positioning devices. In the area covered by the existing Wi-Fi network, the positioning function can be realized only by software upgrades and configurations, so the deployment cost is relatively low. But if it is necessary to improve the positioning precision and adopt the fingerprint positioning method, a large amount of human and time costs need to be invested in the early data collection and database establishment work.

Device Compatibility:

Bluetooth Beacon Positioning: Bluetooth technology is already very mature and is compatible with most existing smart devices, making it easy to integrate. As long as the device supports the Bluetooth function, it can receive the signals of Bluetooth beacons and perform positioning.

Wi-Fi Positioning: Almost all smart devices such as smartphones, tablets, and laptops support the Wi-Fi function and are also well compatible with the Wi-Fi positioning technology. However, some older devices may not support certain specific Wi-Fi positioning functions or protocols.

Power Consumption:

Bluetooth Beacon Positioning: Adopting Bluetooth Low Energy (BLE) technology, the power consumption is relatively low. Bluetooth beacon devices can be powered by batteries for a long time. For example, the battery life of some Bluetooth beacons can reach 3 - 8 years. Positioning tags can also work for a long time even when powered by batteries.

Wi-Fi Positioning: Wi-Fi devices need to continuously communicate with the access points during operation, and the power consumption is relatively high, which has a certain impact on the battery life of mobile devices. Especially when performing high-precision positioning, it may be necessary to frequently scan the surrounding Wi-Fi signals, which will further increase the power consumption.

Anti-interference Capability:

Bluetooth Beacon Positioning: Bluetooth signals are easily interfered with in crowded environments. For example, in densely populated places or environments with multiple Bluetooth devices, the signals may become unstable, affecting the positioning effect.

Wi-Fi Positioning: It is also easily interfered with. In addition to interference from other Wi-Fi signals, devices such as microwave ovens and cordless telephones may also interfere with Wi-Fi signals, resulting in a decrease in positioning precision. In addition, the attenuation and multipath effects of Wi-Fi signals caused by obstacles in the indoor environment are also relatively obvious.

Bluetooth beacon positioning is suitable for indoor positioning scenarios with high precision requirements and a small coverage area, such as precise navigation in shopping mall stores and museum exhibit guided tours, etc.; Wi-Fi positioning is more suitable for places with relatively lower precision requirements and a larger coverage area, such as indoor positioning in large shopping malls, airports, hotels, etc., as well as some location-based advertising push and information service applications.