  Localisation can be defined as estimating or finding a position of the node.
There are two techniques in localisation, which are range-based and range-free
techniques. This paper focusses on the Received Signal Strength Indicator
(RSSI) localisation method, which is categorised in a range-based technique
along with the time of arrival, time difference of arrival and angle of
arrival. Therefore, this study aims to compare the trilateration and
multilateration method for RSSI-based technique for localising the transmitted
(Tx) node. The wireless sensor module in the work used LOng-RAnge radio (LoRa)
with 868MHz frequency. Nowadays, wireless networks have been a key technology
for smart environments, monitoring, and object tracking due to low power
consumption with long-range connectivity. The number of received (Rx) nodes are
three and four for trilateration and multilateration methods, respectively. The
transmitted node is placed at 32 different coordinates within the 10x10 meter
outdoor area. The results show that error localisation obtained for General
Error Localisation (GER) for multilateration and trilateration is 1.83m and
2.30m, respectively. An additional, the maximum and minimum error for
multilateration and trilateration from 1.00 to 5.28m and 0.5 to 3.61m. The
study concludes that the multilateration method more accurate than
trilateration. Therefore, with the increasing number of Rx node, the accuracy
of localisation of the Tx node increases.
