- カテゴリ： バーチャル提案
- 作成日： 2009/07/24 21:23:25
- ページ： 30
- Overview of Operations
In addition to the current 800MHz band and the 2GHz band, KDDI has made available tri-band (current 800MHz, 2GHz and new 800MHz) compatible handsets, and as of the end of March 2009, approximately 15.7 million, or about 50% of all au handsets under contract, were tri-band compatible. The Company will continue working to provide more tri-brand handsets over the next three years, so that by the time of the July 2012 switch to the new band, all au subscribers will be using tri-band handsets. As part of its efforts to respond to current growth trends in data communications traffic, while also ensuring efficient capital investment, KDDI has decided to introduce a 3.9G system based on the LTE technology, with a view to providing services from 2012. Furthermore, to respond to subscriber needs for high-speed data communications until the introduction of the LTE based service, the Company plans to upgrade the software behind its EV-DO Rev. A infrastructure in the latter half of FY 2011.3, introducing Multicarrier Rev. A to bring downlink speeds to up to 9.3 Mbps.
3G Mobile Phone Market Data Transmission Market 3.5G CDMA* 3.9G OFDMA
EV-DO Rev. 0 CDMA2000 1x *CDMA: FDD
Multicarrier Rev. A
HSDPA W-CDMA 2002 2004 2006 2008
WiMAX (OFDMA: TDD) Wi-Fi
Note: LTE: Long Term Evolution OFDMA: Orthogonal Frequency Division Multiple Access LTE achieves interworking with existing systems, realizing seamless handover to other systems, through the handset’s dual-mode, etc.
A Diverse Line-Up to Support Lifestyles
To support the diverse lifestyles of its customers, KDDI has rebuilt an innovative lineup of “au” handsets, including the “Walkman? Phone,” which provides high-quality sound, the “EXILIM-Keitai” and “Cyber-shot? phone,” which combine organic EL displays and 8.1 megapixel cameras for full photographic enjoyment, the “Wooo-Keitai,” the world’s first handsets capable of displaying 3D movies and games, and the “Sportio,” geared towards sports enthusiasts. The Company has also released a “Simple Phone” series targeting seniors, and the “Security Junior Phone” series for pre-teens, all in pursuit of greater ease of use, and safer, more secure mobile services. In all, FY 2009.3 featured the introduction of 36 new models (including models for the corporate market).
KDDI CORPORATION Annual Report 2009