| • Science | • People | • Locations | • Timeline |
Like D-AMPS and GSM, PDC uses TDMA. The standard was defined by the RCR (later became ARIB ) in April 1991, and NTT DoCoMo launched its Digital MOVA service in March 1993. PDC uses 25 kHz carrier, 3 time slots, pi/4-DQPSK modulation and low bit-rate 11.2 kb/s and 5.6 kb/s (half-rate) voice codecs.
PDC is implemented the in 800 MHz (downlink 810-888 MHz, uplink 893-958 MHz), and 1.5 GHz (downlink 1477-1501 MHz, uplink 1429-1453 MHz) bands. The air interface is defined in RCR STD-27 and the core network MAP by JJ-70.10. NEC and Ericsson are the major network equipment manufacturers.
The services include voice (full and half-rate), supplementary services (call waiting, voice mail, three-way calling, call forwarding, and so on), data service (up to 9.6 kb/s CSD), and packet-switched wireless data (up to 28.8 kb/s PDC-P ).
PDC has 61.817 million subscribers as of end December 2003 but is slowly being phased out in favor of 3G technologies like W-CDMA and cdma2000.