In this blog post, we’ll explore the operating principles and features of Bluetooth beacons—which link the location of smart devices with information about their surroundings—as well as how they differ from NFC, their applications, and their limitations.
Among the apps that were once popular was a service called “Syrup.” “Syrup” offered a feature that provided users with real-time information on product discounts, events, and coupons from nearby stores when they turned on their phone’s Bluetooth. How was this feature possible? At the time, Bluetooth beacon technology served as the foundation for such services. What exactly is a Bluetooth beacon? A beacon is a device that periodically transmits wireless signals over short distances, and a Bluetooth beacon generally refers to a beacon that utilizes Bluetooth Low Energy (BLE) technology. When a user installs a related app on a smart device such as a smartphone or tablet, the app detects beacon signals transmitted in the vicinity to determine whether the user has entered the range of a specific beacon, and based on this, it can provide services such as messages or information. Apple’s iBeacon also utilizes BLE to determine whether a smart device has entered or exited the range where a specific beacon’s signal is detected and to estimate the relative distance to the beacon.
So how do beacons detect the location of a smart device or whether it is in the vicinity? In the past, triangulation was often cited as an example to explain how beacons determine location. However, it is more accurate to understand a typical Bluetooth beacon system as one that estimates the relative distance between a smart device and a beacon using metrics such as the received signal strength (RSSI) of the beacon’s transmitted signal, rather than a single beacon directly triangulating the smart device’s exact coordinates. The system then determines the location by combining information from multiple beacons. For example, assuming the distance between a beacon and a smart device is d, the distance can be estimated by measuring the signal strength when the signal transmitted from the beacon reaches the smart device. By combining distance information obtained from multiple reference points or multiple beacons, the location of the smart device can be estimated with greater precision. However, since distance estimation using RSSI is affected by factors such as people, obstacles, the surrounding environment, and installation conditions, it does not always guarantee an exact location. The Bluetooth SIG also explains that distance estimation using existing beacon technology can be affected by environmental conditions and that distance estimation using a single beacon has limitations in terms of accuracy. Therefore, it is appropriate to understand beacons as a technology that detects whether a smart device has entered a specific distance or area and, based on that result, implements services such as message transmission or information provision.
If recognizing location or proximity is the primary function of a beacon, what does “Bluetooth” mean in the name “Bluetooth beacon”? The core technology used in beacons is Bluetooth Low Energy (BLE). BLE was first introduced in the Bluetooth Core Specification 4.0 and has evolved—while being used alongside the existing Bluetooth Classic—with low power consumption as a key feature. Early BLE was designed to allow devices with small batteries to operate for extended periods, and this low-power characteristic made it well-suited for devices such as beacons. Furthermore, since BLE supports not only one-to-one communication but also broadcast-style communication, it can be utilized in a manner where a single device transmits signals to multiple receiving devices. Today’s Bluetooth technology has not remained stagnant at the initial Bluetooth 4.0 standard; new features are continuously being added. Current Bluetooth LE also includes location-related technologies, such as features for direction detection and distance measurement, expanding its scope of application beyond simple short-range signal transmission into a wider range of location-aware fields.
NFC is another short-range wireless communication technology frequently mentioned alongside Bluetooth beacons. While both technologies can connect smart devices and exchange information at close range, they differ in how they operate and their intended purposes. Typical beacons continuously transmit signals to their surroundings so that smart devices can detect them, allowing services to be deployed across relatively large areas. In contrast, NFC is suited for communication when devices are in very close proximity—either through contact or proximity—and this characteristic is utilized in services requiring intentional proximity actions, such as payments, access authentication, and device pairing. NFC technology continues to evolve, and recent developments have focused on improving authentication standards and the contact distance between devices. Therefore, rather than viewing beacons and NFC as a relationship where one simply replaces the other, it is more appropriate to understand that BLE beacons—suitable for detecting surrounding information over a wide area—and NFC—suitable for enabling intentional interactions at very close range—are each utilized according to their specific purposes.
Bluetooth beacon technology has evolved across various ecosystems, including Apple’s iBeacon. In particular, Apple has utilized iBeacon in iOS to provide functionality that allows smart devices to detect when they enter or exit a specific beacon zone and to estimate their relative distance from the beacon. Therefore, it is difficult to conclude that Apple started with Bluetooth beacons and later switched to NFC. Apple continues to provide developers with iBeacon-related features and BLE-based technologies, utilizing NFC and BLE for different purposes. iBeacon can distinguish between multiple beacons using identification information such as specific UUIDs, majors, and minors, enabling location awareness and information provision services within specific spaces such as stores or buildings. Meanwhile, BLE itself continues to evolve, incorporating new location-aware features such as direction detection and distance measurement. Therefore, rather than viewing the relationship between Bluetooth beacons and NFC as a simple competitive dynamic between specific companies or camps, it is more accurate in the current technological landscape to view their areas of application as varying based on their respective technical characteristics and service objectives.
Beacons are not without their limitations, however. Despite their technical potential, issues such as privacy protection, security, and signal accuracy remain significant challenges. First, since the process by which smart devices detect nearby beacon signals and provide services based on them may involve the processing of information related to a user’s location or behavior, privacy considerations are essential. Furthermore, distance estimation using beacon signals can be affected by the surrounding environment, and simply detecting a signal does not necessarily determine a user’s exact location. Security is also a critical issue. While Bluetooth technology itself includes various security features to protect communications, the actual security of a service can vary depending on the technology used, the application, and the system’s implementation. The Bluetooth SIG explains that it includes various security features in the Bluetooth specifications and is continuously strengthening security standards. Given these characteristics, rather than concluding that either NFC or beacons is superior in all situations, it is necessary to comprehensively consider the communication range, methods, security requirements, and service objectives provided by each technology.
Despite the technical and social issues discussed earlier, Bluetooth beacons are being utilized in a wide range of fields. Areas where beacons can be applied include marketing, location and asset tracking, information provision, automation, and access control. For example, in retail stores, they can be used to provide product or event information when a user approaches a specific area, while in buildings or facilities, they can detect when a user has reached a specific location to trigger guidance or automation functions. At airports or large facilities, guidance services can be set up using location information for visitors and facilities, and the technology can also be applied in areas such as building security and access control. Furthermore, since BLE itself has expanded its scope of application by supporting various communication methods—such as broadcasting and mesh networks—services utilizing beacons can also extend beyond simple marketing to include location awareness, automation, and asset management. As Bluetooth Low Energy (BLE) and location-aware technologies continue to advance, the range of fields where beacons can be utilized is likely to become even more diverse.
Bluetooth beacons are a technology that combines short-range wireless communication with location awareness to connect smart devices with their surroundings. However, just because the technical potential is great does not mean all problems have been solved. For Bluetooth beacons to be adopted more widely in society, various issues—including privacy protection, security concerns, the accuracy of location estimation, and problems that may arise during service use—must be addressed collectively. Furthermore, rather than attempting to explain the entire short-range wireless communication market with a single technology, it is important to consider which environments and purposes NFC and BLE are best suited for. Currently, Bluetooth LE is not limited to early beacon technology but continues to advance location-related functions such as direction detection and distance measurement. Therefore, Bluetooth beacons are not limited to the simple in-store navigation technology of the past; rather, alongside the advancement of BLE, they can be viewed as a technology that is expanding its potential applications across various fields, including location awareness, information provision, automation, and asset management. If limitations such as privacy protection, security, and accuracy are appropriately addressed alongside these technological advancements, beacons will continue to broaden their scope of application in short-range wireless communication and location-based services.
