NTT Docomo’s “5G SA” hit by another outage; cause was the same “switch congestion” as on the 5th; service restored after about 9 hours - ITmedia NEWS

　NTT DOCOMO announced on November 11 that the nationwide difficulties using mobile phone services for subscribers of “5G SA (Standalone),” which had been occurring since 10:34 a.m. that day, were fully resolved at 7:17 p.m., approximately nine hours later.

　The cause was congestion at the switches accommodating 5G SA subscribers, the same as the outage on the 5th. No signs of unauthorized access or incidents indicating a cyberattack have been confirmed.

　The outage lasted approximately nine hours, from 10:34 a.m. on November 11. Voice calls, data communications, and SMS became difficult to use for 5G SA subscribers, and the “out of coverage” indicator sometimes appeared. 5G and 4G users other than 5G SA subscribers, as well as MVNOs, were not affected.

　During the outage, users were advised that changing the network setting to 4G might allow them to use the service, but with the restoration, they are being urged to switch the setting back.

Also on the 5th, a 14-hour outage caused by “congestion of 5G SA switches”

　DOCOMO also experienced an outage caused by congestion at its 5G SA switches on November 5, which took approximately 14 hours to resolve.

　5G SA is an option that communicates using only dedicated 5G equipment. It is promoted as not being affected by congestion in 4G communications, allowing smooth communications even when 4G traffic is congested.