Bluetooth Low Energy (BLE) is specifically designed for low-power, short-range communication, making it ideal for high-density environments like stadiums. Using a network of BLE beacons, a mobile application can determine a user's location with high precision through techniques like trilateration based on Received Signal Strength Indication (RSSI). This method can achieve the required location accuracy of 1.5 meters (5ft), enabling precise location-based services such as seat-side food delivery, emergency response, and interactive fan experiences. The low energy consumption of BLE also ensures that the tracking functionality does not significantly drain the battery of the fans' mobile devices.

A. SSID: A Service Set Identifier (SSID) is the name of a Wi-Fi network. It is not a location-tracking technology itself, but rather an identifier for a network that might be used for less precise positioning.

C. NFC: Near Field Communication (NFC) has an extremely short operational range, typically less than 4 cm. It is unsuitable for continuous tracking and is used for "tap-and-go" interactions, not area-based positioning.

D. IoT: The Internet of Things (IoT) is a broad technological concept describing a network of connected devices. It is not a specific positioning technology; rather, BLE is one of the enabling technologies used within an IoT framework.

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1. Official Vendor Documentation: Bluetooth Special Interest Group (SIG). "Bluetooth Location Services." The official Bluetooth website details two types of location services: proximity solutions and positioning systems. It states

"Proximity solutions use BLE to determine if two devices are near each other

and at what distance... Positioning systems use Bluetooth to determine the physical location of devices [with] meter-level accuracy."

Source: Bluetooth Technology Website

Location Services Overview. (www.bluetooth.com/learn-about-bluetooth/bluetooth-technology/location-services/)

2. Peer-reviewed Academic Publication: Zafari

F.

Gkelias

A.

& Leung

K. K. (2019). "A Survey of Indoor Localization Systems and Technologies." IEEE Communications Surveys & Tutorials

21(3)

2568-2599.

Reference: Section IV.A

"Bluetooth

" pp. 2577-2579. The survey notes that BLE-based systems using RSSI fingerprinting or trilateration can achieve an accuracy of approximately 1-3 meters

which aligns with the scenario's requirement.

DOI: https://doi.org/10.1109/COMST.2019.2911558

3. University Courseware: Patterson

D. & Grijincu

S. (2018). "Lecture 18: Bluetooth Low Energy." CS 162: Operating Systems and Systems Programming

University of California

Berkeley.

Reference: Slide 34

"Beacons." The lecture explains how BLE beacons broadcast identifiers that smartphones can detect to trigger location-aware actions

forming the basis for indoor positioning systems used in retail and public venues.