A device may receive, from a beacon device, a first message including a first identifier. The first identifier may be associated with the beacon device. The device may receive, from a user device, a second message including a second identifier. The second identifier may be associated with the user device. The device may determine the second identifier based on the second message and the first identifier. The device may determine an event associated with the second identifier based on the first identifier. The device may provide, to another device, information that identifies the second identifier and the event to permit the other device to identify a displacement trajectory associated with the user device.