| Personal Digital Cellular |
Article Index for Personal |
Website Links For Personal |
Information AboutPersonal Digital Cellular |
| CATEGORIES ABOUT PERSONAL DIGITAL CELLULAR | |
| mobile telephony standards | |
|
Personal Digital Cellular ('''PDC''') is a 2G Mobile Phone standard developed and used exclusively in Japan . 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, pi/4- DQPSK modulation with 3-timeslot 11.2 kbit/s (full-rate) or 6-timeslot 5.6 kbit/s (half-rate) voice Codec s. PDC is implemented in the 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 kbit/s CSD ), and packet-switched wireless data (up to 28.8 kbit/s PDC-P ). Voice vodecs are PDC-EFR and PDC-HR . Compared to GSM , PDC's weak broadcast strength allows small, portable phones with light batteries at the expense of substandard voice quality and problems maintaining the connection, particularly in enclosed spaces like elevators. After a peak of nearly 80 million subscriber to PDC, it had 46 million subscribers in December 2005, and is slowly being phased out in favor of 3G technologies like W-CDMA and CDMA2000 . |
|
|