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Toward Third-Generation
Mobile Communications for Mobile Phones
Realizing the Ubiquitous
Society with Third-Generation Mobile Phones
OKAMOTO Kosei
Approach to Evolving 3G Mobile
Phones
NANNICHI Toshihiko
Third-generation (3G) mobile phones have shown rapid growth as
personal terminals for the ubiquitous network era with the realization
of high-speed data communications, global roaming, and high-quality
voice communications. Various applicable services have appeared,
such as a payment system using contactless IC technology. In addition,
the latest technologies including compatibility with other wireless
methods such as BluetoothTM and wireless LAN (W-LAN) are also required.
Toshiba is actively working on the development
of 3G mobile phones and has been launching wideband code division
multiple access (W-CDMA)
and CDMA2000 handsets. We will continue to supply ever-evolving
mobile phones to the market by developing and implementing the
latest core technologies for advanced services.
Vodafone 902T W-CDMA Phone
GOTO Hiroyuki / GOTO Takashi / HIRAI Masato
Higher functionality for cellular phones requires third-generation (3G) technology.
The Vodafone Group encourages the development of 3G convergence models that
can be used in more than 100 countries. The Vodafone 902T wideband code division
multiple access (W-CDMA) phone is the most advanced model that Toshiba has developed.
It features dual-mode technology, which improves radio frequency coverage; video
telephony technology, which requires simultaneous data and voice communication;
and multimedia messaging services (MMS) functionality, which enables users to
send and receive slide-format mail with pictures, video images, or music attached.
The "Active Turn Style" dual-hinge mechanical structure of the phone
also improves camera usability.
W31T CDMA2000 1xEV-DO Cellular
Phone for Japanese Market
KATAYANAGI Masanori / DAI Hiroyuki / MAKINO Hiroshi
The CDMA2000 1xEV-DO (code division multiple access 2000 1x evolution
data only) service was launched by the Japanese service provider
au in November 2003. In response to this service, Toshiba commercialized
the W21T cellular phone for the Japanese market in November 2004,
which received favorable evaluations. Large-volume contents can
be downloaded with a maximum forward link communication speed of
2.4 Mbps, which is the main feature of this service, enabling users
to enjoy 3D games, high-quality music, and so on. On the other
hand, the size of this model is comparatively large due to the
installation of various features.
We have now developed the W31T
model, which is the latest CDMA2000 1xEV-DO cellular phone for
the Japanese market. Despite having
even more features than the preceding W21T model, the W31T is
only 20 mm thick, making it the thinnest model of this baseband
series
in the Japanese market (as of May 2005).
Platform Software for Mobile
Phones
INOUE Sakae
The volume of software for mobile phones continues to increase
with the expansion and evolution of both carrier-specific services
and device vendor-specific services. As a result, it is necessary
to develop software more efficiently while maintaining software
quality.
To meet these requirements, Toshiba has constructed
the "Toshiba
Framework Plan" composed of the following three elements:
improvement of porting, improvement of maintenance, and improvement
of openness. The Toshiba Framework is evolving together with not
only Toshiba applications but also other software platforms provided
by software vendors. It is important to design software mechanisms
that control both the Toshiba Framework and the software platforms
of software vendors in a coordinated manner.
Multimedia Technologies for
Convergence of Telecommunications and Broadcasting
AKIMOTO Satoshi / MASUDA Isao / UNOKI Yasushi
As third-generation (3G) cellular phones become increasingly widespread,
remarkable progress is being made in broadband media services such
as video telephony, movie downloading, and streaming.
Toshiba has
developed a new "Mobile Turbo" series of multimedia LSIs that
make it possible to upgrade various products for multimedia
services. In addition, we consider our synchronous control and
error handling technologies to be key elements of such multimedia
services. We are providing multimedia services that offer greater
satisfaction to users by implementing these technologies for cellular
phones.
Multiband Internal Antenna
Technology
AMANO Takashi / SATO Koichi / MIZOGUCHI Satoshi
The evolution of mobile phones has also led to a remarkable evolution
in antenna technologies. Antennas for mobile communications must
respond much more closely to the effects of the surrounding environment
than antennas for fixed communications. Moreover, the recent demand
for internal antennas has resulted in even further advancements
in the design technology.
Toshiba has developed a multiband internal
antenna aimed at third-generation mobile phones. The newly developed
antenna realizes half the mounted
volume as well as a 2 dB improvement in antenna efficiency.
Key Technologies for Mobile
Terminals in Future Wireless Communication Systems
DEGUCHI Noritaka / SATO Kazumi / KOBAYASHI Takahiro
Higher data rates and higher capacity are expected features of
the coming next-generation wireless systems. Another expected
feature is seamless access to plural systems. On the other hand,
mobile terminals for such enhanced systems tend to be complicated.
Toshiba
has therefore developed a multiple input multiple output (MIMO)
receiver with group detection and layered architecture for
a software-defined radio modem that respectively reduce the amounts
of digital signal processing and software processing. These
technologies achieve reductions in both the complexity and the
power consumption of the mobile terminal.
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