Development of Muli-band Power Amplifier for Mobile Phone by DOCOMO
NTT DOCOMO made an announcement on development of a multi-band power amplifier prototype capable of amplifying 8 different frequency bands ranging from 700 MHz to 2.5 GHz. Use of power amplifier in mobile phone is to increase signal power to a level that is required for given wireless communication protocol. Accommodating multi-band capability inevitability increases the mobile phone’s size for a simple fact of employing a separate single-band amplifier for each band. However, DOCOMO’s newly developed prototype is capable of 8-band operation through use of matching circuits where the frequency characteristics are controlled by multiple semiconductor switches to accommodate the required frequency band. Read more
Development of Solutions for Combating Silent Failure in IP Networks by DOCOMO and Fujitsu
In an IP network silent failure occurs when a router fails and as a result of this data transmission is stopped all without the network administrator being notified. This phenomenon is due to the fact that routers are not capable of detecting their own internal failures. The current solution to overcome this issue is for network operators to install dedicated monitoring devices capable of detecting silent failures through continually transmitting test data throughout the entire network and analyzing the test result, a rather time consuming process indeed. Based on this need, DoCoMo and Fujitsu have jointly developed two new technologies capable of detecting and locating “silent failures” within IP networks with greater speed and accuracy than currently available methods. One of these newly developed technologies is responsible for analyzing not only the test transmitted data but also analyzing such information as loss rate and network delays which would results in faster detection of silent failure. It is also capable of detecting warning signs of silent failures that would possibly about to occur. Read more
DOCOMO unveils its green Mobile Phone Prototype with touch of Style
I guess use of scrap woods or so called surplus woods is becoming a technology trend coinciding with thinning tree activities in maintaining healthy forest. This is my second post on this subject. It all started with Mitsubishi’s announcement on development of new plastic resin from the surplus cedar wood. This follows with today’s DOCOMO announcement on development of mobile phone prototype made of surplus wood of trees culled. Well only the exterior body of the phone is made of wood. The new prototype was developed in corporation with Sharp and Olympus Corporation as well as with the collaboration of “more trees”, a reforestation project which is founded by musician Ryuichi Sakamoto and others. Read more
Development of Solar powered mobile phone by DoCoMo
NTT DOCOMO made an announcement on development of SOLAR HYBRID soalr powered, waterproof mobile phone. Docomo STYLE series™ SH-08A will go on sale at all DOCOMO sales channels in Japan from September. The SOLAR HYBRID can be recharged with sunlight as well as electricity. The user would be able to use the SOLAR HYBRID even when its battery has completely lost its charge, by just 10 minutes of solar recharging via a panel on the phone’s body the user can approximately talk for one minute on SOLAR HYBRID . The SOLAR HYBRID features an 8-megapixel CCD camera capable of taking photo even in dim lighting or when objects are moving. The SOLAR HYBRID complies with IPX5 /IPX7 specification. ?
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Development of Enhanced Femtocell Base Transciever station by DoCoMo
DoCoMo announced the development of a compact indoor base transceiver station or otherwise referred to as femtocell BTS. The newly developed femtocell BTS supports extra fast data communication according to DoCoMo. The newly developed femtocell BTS is compatible with High Speed Packet Access (HSPA) technology which is an integration of HSDPA (downlink) and HSUPA (uplink) giving a boost in the upload speeds. The newly introduced DoCoMo’s femtocell has a best effort downlink capability of 14Mbps and uplink of 5.7Mbps in comparison to the current femtocell which offers downlink of 3.6Mbps and uplink of 384Kbps.DoCoMo introduction of femtocell is to expand mobile phone services at home as well as small offices where radio signals from DoCoMO’s outdoor base stations have a difficulty reaching the users. Read more
Development of Spatial Audio Transmission Technology for Mobile Phones
NTT DoCoMo has unveiled a newly developed spatial audio transmission technology for mobile phones capable of assigning a spatial position to each sound source when a user is listening to multiple sound sources for example during a game or a conference call. Through this technology the user is able via the headphone to hear each speaker’s voice as if they were coming from a unique direction creating a virtual face-to-face communication environment. DoCoMo’s planned target for this newly developed technology is for use in mobile conference calls, tele-education and online games according to DoCoMo. Read more
