There Was a Reason Why LG Uplus Customers Especially Experienced No 5G Signal on KTX

Ministry of Science and ICT Releases Communication Quality Evaluation Results
'Poor' Ratings Found in 19 High-Speed Rail Sections
LGU+ Experiences Slow Speeds on Metropolitan Subway Lines

As a result of evaluating the 5G service quality of mobile carriers, LG Uplus was found to have 12 areas, KT 7 areas, and SK Telecom 6 areas, totaling 19 locations (excluding overlaps) where download speeds slowed down, indicating poor quality zones.

The Ministry of Science and ICT announced on the 30th the results of coverage inspections and quality evaluations of 5G and LTE communication services conducted from May to December.

Evaluating 5G quality at a total of 400 locations, including 200 outdoor administrative districts and 200 major facilities, a total of 19 poor quality zones were discovered on high-speed trains such as KTX and SRT.

In these zones, the rate of 5G download transmission success falling below the standard speed (12Mbps) was over 10%. This is a level at which users may experience significant inconvenience when using online video services (OTT) and the like.

LG Uplus received poor ratings in a total of 12 sections, including 6 KTX sections such as Gwangmyeong~Cheonan Asan, Cheonan Asan~Daejeon, Daejeon~Gimcheon Gumi, Gimcheon Gumi~Dongdaegu, and 6 SRT sections. KT was rated poor in 7 sections in total, including 3 KTX sections such as Yangpyeong~Seowonju and 4 SRT sections such as Pyeongtaek Jije~Cheonan Asan and Cheonan Asan~Osong.

SK Telecom had a total of 6 poor quality sections, including 5 KTX sections such as Gimcheon Gumi~Dongdaegu, Dongdaegu~Gyeongsan, Gyeongsan~Miryang, and 1 SRT section.

Meanwhile, LG Uplus showed the slowest download speeds among the three carriers on the Seoul metropolitan subway.

LG Uplus's average download speed on the metropolitan subway was 986.26Mbps, slower than SK Telecom (1007.53Mbps) and KT (1003.47Mbps).

Comparing the average download speeds across subways nationwide, the order was SK Telecom (1103.12Mbps), KT (1063.76Mbps), and LG Uplus (1031.37Mbps).