Integrating an Effective VoIP Service in a USRP/GNU Radio Testbed.
Résumé
This work presents an implementation of spectrum
handoff and selection in order to experiment a Voice over IP
(VoIP) application over a cognitive radio testbed. VoIP connections
use both WiFi bands and GSM bands to select available
channels dynamically. We use the USRP/Gnu radio testbed to
implement spectrum management functions and to run the experiments.
We also experiment VoIP and data transfers together
by implementing a satisfaction-based inter-service cohabitation
strategy. Through subjective observations and objective measurements,
we found that the quality of established phone calls can
be maintained. Besides, VoIP can benefit from the flexibility of
data transfers to perform handoffs more adequately. In the same
time, data transfer is able to sustain its required average rate
with minimum degradations.