Bluetooth positioning method analysis

Bluetooth positioning method is performing below the expectation, however it can still achieve 49% accuracy. The total number of Bluetooth positioning method sample is 59. Bluetooth positioning method is working fine at its own POI (gents) in the first and third round of test.it can achieve accuracy of 60% and above, however in the second round its accuracy drop to 40% only.

The Bluetooth beacon is place in the middle of the POI. Whenever the Bluetooth positioning module detects the beacon signal, it returns the respective POI as the

estimated location. Therefore Bluetooth positioning method is performing well in the POI with Bluetooth beacon. However this method has a drawback which it causes the adjacent POI to be mistakenly detected as the gents whenever the Bluetooth beacon signal reach beyond the POI area. As shown in the result, South Elevator and the Gents Corridor (GENTS_C) are affected the most by this interference.

4.2.2.8 Comparison on the 3 positioning method

Among the three positioning method, Bluetooth positioning method has the highest overall accuracy, followed by Wi-Fi fingerprinting positioning method and lastly the Wi- Fi trilateration positioning method.

Bluetooth positioning method has better results because the POI that has the Bluetooth beacon is not too big, just within the range of a Bluetooth connection coverage area. Therefore the Bluetooth signal can reach the mobile device when it is in the POI area. Moreover, there are not many obstacles like walls in between the Bluetooth beacon and the mobile device. It makes the connection more stable, and hence the detection of signal will not be a problem.

Bluetooth positioning method has improved the overall accuracy for each round of tests, especially in the third round, gents which has the Bluetooth beacon achieved up to 93% of accuracy. The only time that the Bluetooth positioning is interfered with and pulled down the overall accuracy is in the first round of test. Bluetooth beacon signal is able to reach two adjacent POI, and causes confusion to the positioning module.

5.0 CONCLUSION

To summarize, the Bluetooth positioning method is useful when the POI is covered with walls, and in a small area. With the walls covered POI, the signal will not reach adjacent POI easily, and when the POI area is small, the Bluetooth signal is able to reach the entire POI area. On the other hand, Wi-Fi positioning method performs better in open area that does not have many obstacles. In terms of coverage area, Wi-Fi fingerprinting positioning method can cover larger area compared to Wi-Fi trilateration.

In the future, there are some improvements can be made to the framework. The first thing is to include the digital compass feature as one of the positioning module. With this, the framework is able to estimate the direction that the user is facing to. User’s direction can improve the location based system service. For example, if the user is facing shop A, then the location based service module can put the advertisement about shop A at higher priority.

Other than that, to reduce the interference on the adjacent POI, POIs that have Bluetooth beacon should have a mechanism to control the signal and prevent it to reach other POI. Another improvement could be done to test the framework in more locations, such as locations that only has rooms, and a large open area that does not have walls. Besides that, more Wi-Fi access points to be added to reach more POIs with direct line of sight. This can improve the performance of the Wi-Fi positioning.

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