BLE (Bluetooth Low Energy)

An energy-efficient wireless protocol widely used for asset tracking, personnel monitoring, and indoor positioning. Operates in 2.4 GHz band with low power consumption enabling months or years of battery operation. Offers low-cost infrastructure, smartphone compatibility, reasonable range (10-50 meters), and adequate accuracy (room-level to 1-3 meters with 5.1). Cost-effective for large-scale deployments.

Wireless technology designed for short-range communication with minimal power consumption, used in RTLS applications. BLE operates at 2.4 GHz ISM band with 40 channels (3 advertising channels, 37 data channels). In RTLS context, BLE enables positioning through RSSI-based ranging (3-15 meter accuracy), AoA/AoD in Bluetooth 5.1+ (0.5-3 meter accuracy with specialized antenna arrays), or proximity detection. BLE advantages include: extremely low tag power consumption (10-50mW enabling 1-3 year battery life), ubiquitous support in smartphones and tablets, low infrastructure cost ($50-200 per gateway), and good penetration through obstacles. Limitations include: reduced accuracy compared to UWB, susceptibility to interference from Wi-Fi and other 2.4 GHz sources, and limited range (typically 10-50 meters in industrial environments). Update rates typically 1-5 Hz. BLE RTLS is cost-effective solution for applications tolerating meter-level accuracy such as zone-based tracking, proximity detection, or large-area coverage where ultra-precise positioning is unnecessary.