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TECHNICAL DETAILS
CDMA technology uses a feature called DSSS
(Direct Sequence Spread Spectrum) that enables
the phone to keep communication from being
crossed and to use one frequency channel by
multiple users in the same specific area. This
results in a 10-fold capacity increase when
compared with analog mode. In addition, features
such as soft/softer handoff, hard Handoff, and
dynamic RF power control technologies combine
to reduce call interruptions.
The Cellular and PCS CDMA networks consist
of MSO (Mobile Switching Office), BSC (Base
Station Controller), BTS (Base Station
Transmission System), and MS (Mobile Station).
* TSB-74: Protocol between an IS-95A system
and ANSI J-STD-008
1xRTT system receives twice as many
subscribers in the wireless section as IS-95. Its
battery life is twice as long as IS-95. High-
speed data transmission is also possible.
The following table lists some major CDMA
standards.
10
CDMA Standard
Designator
TIA/EIA-95A
TSB-74
Basic Air
ANSI J-STD-008
Interface
TIA/EIA-IS2000
ANSI TIA/EIA 553A
TIA/EIA/IS-634
TIA/EIA/IS/651
Network
TIA/EIA/IS-41-C
TIA/EIA/IS-124
TIA/EIA/IS-96-B
TIA/EIA/IS-99
TIA/EIA/IS-637
Service
TIA/EIA/IS-657
IS-801
TIA/EIA/IS-707-A
TIA/EIA/IS-97
TIA/EIA/IS-98
ANSI J-STD-018
Performance
ANSI J-STD-019
TIA/EIA/IS-125
Description
CDMA Tri-Mode Air Interface
14.4kbps radio link protocol and
inter-band operations
IS-95 adapted for PCS frequency
band cdma2000 1xRTT AirInterface
Advanced Mobile Phone Service
MAS-BS
PCSC-RS
Intersystem operations
Nom-signaling data comm.
Speech CODEC
Async Data and Fax
Short message service
Packet Data
Position Determination
Service (gpsOne)
High Speed Packet Data
Cellular base station
Cellular mobile station
PCS personal station
PCS base station
Speech CODEC
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