| Id |
Subject |
Object |
Predicate |
Lexical cue |
| T316 |
0-104 |
Sentence |
denotes |
In this paper, we focused on BLE proximity detection for contact tracing instead of precise positioning. |
| T317 |
105-303 |
Sentence |
denotes |
Three categories of user location will be of importance for this paper including immediate (less than 60 cm), near (1–6 m), and far (>10 m) distance of the Bluetooth receiver from active BLE beacon. |
| T318 |
304-412 |
Sentence |
denotes |
On the other hand, it was still a challenge working with BLE signals that are interfered with by structures. |
| T319 |
413-503 |
Sentence |
denotes |
Indoor setting and layout have direct effects on radio waves used in Bluetooth technology. |
| T320 |
504-682 |
Sentence |
denotes |
Another challenge was that the different beacon types and battery states produce different signal strengths, so using one beacon library for all types of beacons was problematic. |
