B737NG flight crew reported encountering wake turbulence at FL330 in rjjj airspace.

Attributes
ACN	1714030
Time
Date	201912
Local Time Of Day	1801-2400
Place
Locale Reference	RJJJ.ARTCC
State Reference	FO
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737 Next Generation Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	Cruise
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 119.42 Flight Crew Total 20487.75 Flight Crew Type 10487.75
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 72.07 Flight Crew Type 276.43
Events
Anomaly	Inflight Event / Encounter Wake Vortex Encounter

Narrative:

Just prior to top of descent at fl 330 we experienced wake turbulence for 3-4 seconds. We went from smooth to light-mod turbulence according the ipad app. Seat belt sign was on. Flight attendants check-in PA was made and no injuries were reported. An aircraft was observed on TCAS 1;000 ft. Above us perpendicular to our course. ATC was advised.

Original NASA ASRS Text

Title: B737NG flight crew reported encountering wake turbulence at FL330 in RJJJ airspace.

Narrative: Just prior to top of descent at FL 330 we experienced wake turbulence for 3-4 seconds. We went from smooth to light-mod turbulence according the iPad app. Seat belt sign was on. Flight attendants check-in PA was made and no injuries were reported. An aircraft was observed on TCAS 1;000 ft. above us perpendicular to our course. ATC was advised.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.