Batteries/Telecom 040513

 (April 2004) A look inside DoCoMo’s 4G world

NTT DoCoMo, Japan’s pioneering telecom company, has a very low profile high tech center in Yokosuka, Japan where the capabilities of 3.5 and 4 G wireless communications are being developed. With 3.5 G, downlink speed would increase 35 times faster than present DoCoMo 384 kilobits per second (kbps.) This speed would cut the cost of transmissions by 1/3 with little cost added to the infrastructure. Performance would be roughly equal to that of a present day notebook with a broadband connection. Such performance could increase interest in portable Internet connections. The technology should be ready by 2005.

Beyond that, 4 G is targeted to provide 20 mbps uplink and 100 mbps downlink, another seven fold increase in speed. The 4 G applications could allow virtual reality performance which is interpreted to be face to face video and audio. Another possible feature would be to have 3D audio which would allow the source of audio to give the recipient the impression of the directional source of the sound.

DoCoMo’s R & D partners include Intel, Texas Instruments, Cisco Systems, Hewlett Packard, Ericsson, Nokia, NEC and Fujitsu. Someone must be convinced there is a need for such technology because DoCoMo is spending $ 1.1 billion annually at the facility.

CBS, March 3, 2004
 (Febuary 2004) Hand crank produces backup cell-phone power
It’s not a battery, but a battery augmentation device. In a palm sized 2.5 ounce plastic box with a hand crank, the Sidewinder built by Innovative Solutions and Technologies ( produces regulated 6.2 Volts from a hand cranked motor running as a generator. Producing about one half Amp, the Sidewinder stores energy in a supercapacitor or sends it directly to a connected cell phone. The $25 device in two minutes of cranking at one and one half revoultions per second produces about six minutes of talk time. Most major cellphones can be connected. Future thinking is to expand the device to provide power to PDAs and other portable devices. (Ed note: to have a single device which would pump up our phone, digital camera and PDA could seriously reduce baggage on a trip, whether to the grocery store or Timbuctoo.)
Portable Design, November 2003, p 31
(12-01)Tyco Electronics announces that their flexible power system is a “ world’s first.” The Infinity platform is capable of handling the power requirements of a wide variety of telecommunication applications. The cabinet solution can be configured with an array of power component building blocks, allowing users to match exact load requirements for their applications. The platform is capable of supporting a wide choice of controllers, distribution units, rectifiers and batteries. The 48 Volt platform covers 800 W. to 15,000 W. total DC power from a single cabinet configuration, allowing the user to make customer power adjustments when needed.