Inside buildings with weak 5G signal or at the edge of 5G coverage, the phone switches between 5G and LTE often, and each switch causes a ping spike or a brief dropout.
Why In a place where the 5G signal comes and goes (inside a building, at the edge of 5G coverage) → Effect The phone keeps switching between 5G and LTE, with a short gap each time → On screen Ping spikes at random even when standing still, with occasional freezes and teleporting
Primary owner External (External) · Also Game team (Client development)
Game team action items
Lengthen the interpolation buffer automatically when jitter rises; record network type changes (5G, LTE) in the logs taken when lag happens, to tell causes apart.
External action items
Tell players to switch to LTE-preferred mode in settings and compare, recommend using Wi-Fi.
Ballpark numbers
Each switch takes tens to hundreds of ms. Most 5G in Korea runs bundled with LTE (NSA), so the 5G part easily connects and drops over and over.
On the graph
Random spikes · RTT, network type changes (5G/LTE)
Where to look
Switch the phone to LTE-preferred mode and compare from the same spot. It’s more conclusive if the client logs changes in the network indicator from Android’s TelephonyDisplayInfo (OVERRIDE_NETWORK_TYPE_NR_NSA and so on) together with RTT
Confirmed if
RTT spikes line up with the times the 5G↔LTE indicator changes, and the spikes disappear in LTE-preferred mode
Ruled out if
Spikes even though the network indicator doesn’t change: “Weak mobile signal and dead zones” or the connection side
5G 통신서비스 품질평가 결과 발표과학기술정보통신부 As announced in 2020, 5G in Korea is offered in NSA mode, with the move to SA still planned
TelephonyDisplayInfoAndroid (Google) OVERRIDE_NETWORK_TYPE_NR_NSA: the network indicator shown when the device is on LTE and can use, or is using, dual connectivity (EN-DC) with 5G (NR)