Abstract
Radio frequency signals are commonly used in the development of indoor localization systems. The infrastructure of these systems includes some beacons placed at known positions that exchange radio packets with users to be located. When the system is implemented using wireless sensor networks, the wireless transceivers integrated in the network motes are usually based on the IEEE 802.15.4 standard. But, the CSMA-CA, which is the basis for the medium access protocols in this category of communication systems, is not suitable when several users want to exchange bursts of radio packets with the same beacon to acquire the radio signal strength indicator (RSSI) values needed in the location process. Therefore, new protocols are necessary to avoid the packet collisions that appear when multiple users try to communicate with the same beacons. On the other hand, the RSSI sampling process should be carried out very quickly because some systems cannot tolerate a large delay in the location process. This is even more important when the RSSI sampling process includes measures with different signal power levels or frequency channels. The principal objective of this work is to speed up the RSSI sampling process in indoor localization systems. To achieve this objective, the main contribution is the proposal of a new MAC protocol that eliminates the medium access contention periods and decreases the number of packet collisions to accelerate the RSSI collection process. Moreover, the protocol increases the overall network throughput taking advantage of the frequency channel diversity. The presented results show the suitability of this protocol for reducing the RSSI gathering delay and increasing the network throughput in simulated and real environments.
Highlights
Nowadays, the development of accurate indoor location systems is of great importance in the realization of a wide range of applications, such as: indoor navigation systems, location aware services, collaborative and autonomous robots, etc
802.15.4 networks, with multiple power levels and frequency location systems based on IEEE 802.15.4 networks, with multiple power levels and frequency channels, channels, is presented
Its main advantage over other state-of-the-art approaches is that it makes use of different frequency channels to avoid the medium access contention periods, without having to is presented
Summary
The development of accurate indoor location systems is of great importance in the realization of a wide range of applications, such as: indoor navigation systems, location aware services, collaborative and autonomous robots, etc. The implementation of such systems using radio frequency signals is a challenge due to the physical properties of these signals and it has been treated from different point of views. The RSSI measures are taken using a mobile radio transceiver that exchanges data packets with the infrastructure beacons. Continuous tracking of users requires the exchange of a burst of multiple data packets to gather the RSSI values at every new step
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