On the opening day of the four-day annual extravaganza, esports competitive gaming tournaments held amid heated live comments also attracted crowds, who closely watched and applauded the players' skills at the Makuhari Messe convention center in Chiba, east of Tokyo.
The next-generation services can send and receive data around 100 times faster than current 4G technology.
Google LLC said in March it will launch its own cloud gaming service in 2019, while Apple Inc. is set to roll out new game subscription services, posing a major challenge to traditional game console makers.
Continuing the trend of recent years, the Tokyo Game Show also featured esports competitions, in the hope to entice more domestic players into the fast-growing competitive gaming market.
The event is open to the media and industry officials for the first two days and to the public for the remainder.