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C-E
TD/CDMA
Time DivisioneCode Division Multiple Access.
TDD
Time Division Duplex. Radio technology using an unpaired spectrum. UTMS
also includes a band for TDD mode traffic. PHS and DECT incorporate TDD.
TDMA
Time Division Multiple Access. Used in current mobile phones (PDC). A digital
transmission technology that breaks voice signals into sequential pieces of
defined length, places each piece into an information conduit at specific
intervals and then reconstructs the pieces at the end of the conduit. GSM and
US-TDMA standards apply this technique. Compared to the FDMA (Frequency
Division Multiple Access) applied in earlier analog mobile phones, it
accommodates a much larger number of users by more finely dividing a radio
frequency into time slots and allocating slots to multiple calls. Nevertheless, a
shortage in the number of available channels is anticipated in the very near
future. As a result, a more efficient system adopting CDMA is currently being
developed under IMT-2000.
UMTS
Universal Mobile Telephone System: Third generation telecommunications
system based on WCDMA-DS.
URL
An addressing method for specifying the numerous resources on the Internet
in a uniform manner. A URL is indicated in the format: “protocol name”
://”host name”/”file name”. For example
“http://www.nokia.com/3g/index.htm I” indicates the “3g index.html file”
saved in the www server operating under the host name “nokia.com”.
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