  This article aims to present the results from a study of the quality of
service of 5G networks provided by two major 5G network providers, using a
field trial approach within 60 BTS SkyTrain stations. The results obtained from
the tests using 4 applications on a 5G mobile phone showed that the performance
of 5G networks provided by both operators are different. When calculated for
the average values, it was found both operators had the download speed of 240.3
Mbps and the upload speed of 87.3 Mbps. Besides these values, it was also found
the average latency, the average jitter and the average loss from both major
operators that are 19 ms, 8 ms and 0.299 % respectively. Comparing the average
values derived from the results of this study with the results of another study
in the Asia-Pacific region that was undertaken during the similar period of
time, it was found that the Bangkok download speed is ranked in the 4th place,
whereas the upload speed is ranked in the 1st place. However, it is noted that
this study only covered the area of BTS SkyTrain stations. In the future, the
study should be extended to cover other parts of the Bangkok metropolitan area,
and other provinces. In addition, the study should be conducted by a credible
organization.
