The carrier is scheduled to detail launch plans for the new network later Monday, but ahead of that The Nikkei daily said it will charge a flat-rate fee of ¥6,510 (US$80) per month for the service when it begins in December.

Current monthly charges for its 3G data network range between a minimum of ¥1,000 to up to ¥5,985 for unlimited use.

The LTE charge is about 9 percent higher, but users can expect a big improvement in data transmission speeds.

DoCoMo's current network, based on WCDMA (wideband code division multiple access) 3G technology offers download speeds of up to 7.2Mbps and uploads at up to 3.6Mbps. The new LTE service promises speeds of up to 75Mbps.

The new network comes with some catches.