DoCoMo Spectrum
n78 (3.5 GHz, 100 MHz). n79 (4.5 GHz, ~100 MHz, Japan-specific allocation). n257 (28 GHz mmWave for hotspots). n28 (700 MHz Lower Band) for coverage.
DoCoMo Architecture
DoCoMo led the Open RAN movement in Japan with Samsung, Mavenir, NEC, and Fujitsu mix-and-match. Aggressive vRAN deployment + Open Fronthaul.
n79 Specifics
n79 is unique to Japan — 4.4-5.0 GHz range. Higher SCS (μ=1 default) mostly aligns with n78 but propagation is slightly different. Tight coordination with industrial systems on adjacent bands.
Massive MIMO Deployment
DoCoMo deployed 64T64R AAU early. Beam-management config tuned for Japanese urban density (high-rise buildings, narrow streets, frequent reflections).
FR2 mmWave
n257 (28 GHz) deployed in venues, transit hubs, urban hotspots. Beam-sweep-aware UE handover (handovers triggered by beam quality, not just RSRP).
Engineer Skills Profile
Multi-vendor vRAN (Samsung + NEC + Fujitsu + Mavenir mix), n79 specifics, Japanese density-specific beam tuning, mmWave hotspot operations, RIC xApp / rApp development.