Technology Development and Environmental Enhancement for Improved Communications Quality
Demonstration Experiment on Real-time HD Transmission for Android™ handsets
KDDI R&D laboratories held a demonstration experiment using its "Compact Real-time HD Transmitter for Android™ Mobile Phones" and UQ WiMAX to transmit live over the Internet coverage of the "Nagaoka Festival" (city of Nagaoka, Niigata Prefecture) fireworks display, held in August 2011. The experiment demonstrated that live video broadcasting of full high-definition (HD) video was possible with a device that fits into the palm of a person's hand, without requiring access to large-scale broadcasting equipment. The prototype scored well both in terms of maneuverability and high image quality.
The laboratory plans to continue conducting such trials as it moves toward the commercialization of products based on this prototype.
Demonstration experiment
Using "EV-DO Multi-carrier" Technology to Boost Communication Speeds
As part of its data communication infrastructure for au mobile phones, KDDI has introduced "EV-DO Multi-carrier" technology to expand the functionality of "EV-DO Rev.A." We started offering "WIN HIGH SPEED" for high-speed communications, which allows a maximum downlink speed of 9.2Mbps and an uplink speed of up to 5.5Mbps.
This technology boosts data communication speed by combining two or three "EV-DO Rev.A" carrier waves. Using multiple carrier waves simultaneously for a single mobile phone augments data transmission/reception efficiency, making communication speeds up to three times as fast as current "EV-DO Rev.A" technology.
Easing Data Communication Congestion with "EV-DO Advanced" Technology
KDDI checks mobile phone base station congestion in real time and shifts au mobile phones connected to congested base stations to less-congested stations nearby. To make this possible, KDDI developed "EV-DO Advanced" technology to ease congestion across its networks. This service became available in April 2012. Introducing this technology raised data traffic capacity by around 1.5 times, and doubled [1] average effective communication speed in congested locations.
KDDI aims to create smooth and convenient data communication environments in all customer usage areas.
- [1] Based on KDDI's simulation of mobile phone base station congestions and customer usage conditions
Improvement of Service Area Quality
As part of the efforts to improve the communications environment for au mobile phones, KDDI offers the Reception Quality Survey service for customers nationwide. In this service, KDDI staff visit the homes of customers who have inquired with us about signal quality and examines the reception condition for au mobile phones. In certain cases, KDDI implements service area improvement by using au Femtocells, indoor antennas, and/or au repeaters, which amplifies the outdoor signals and relays them indoors. We will continue to strive to improve service area quality as well as deliver a reliable communication environment through committed reactions to the voices of our customers.
au repeater
Home visit service---Examining signal reception quality to create better service area
au Wi-Fi SPOT Public Wireless LAN Service
KDDI offers the "au Wi-Fi SPOT Public Wireless LAN Service," which allows easy Internet access by anyone with an au smartphone.
By using the dedicated "au Wi-Fi Connection Tool" application, anyone can easily connect to an au Wi-Fi SPOT. Also, depending on the strength of the signal, devices can switch from 3G to Wi-Fi automatically for easy Internet communications.
KDDI is enhancing au Wi-Fi SPOT network construction and increasing the number of hotspots so as to provide easy telecommunications access to all au smartphone users.
Stickers that indicate locations where au Wi-Fi SPOT is available
