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CDMA 120 – cdmaOne and CDMA2000 Concepts and Terminology phần 5 pot
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CDMA 120 – cdmaOne and CDMA2000 Concepts and Terminology
Section 4: Physical Layer
80-13321-1 X11
© 2002 QUALCOMM Incorporated 4-9
CDMA 120
cdma university Section 4-9
Forward Traffic Channel
Filter
Offset I PN
Offset Q PN
MUX
Wt
Power
Control
Bit
1.2288
Mcps
Filter
Block
Interleaver
Convolutional
Encoder &Repetition
9600
4800
2400
1200
Rate Set 1:
Rate Set 2:
14400
7200
3600
1800
Long
Code PN
Generator
User Specific Mask
(ESN)
Decimator Decimator
Analog
MMT98010660Ag.emf
Rate Sets
A Rate Set is a set of Traffic Channel frame formats. Each set is composed of 4 bit rates.
A Rate Set may carry voice, user data, or signaling.
Two Rate Sets are defined for use in cdmaOne systems. All services provided over the air interface
must conform to one of these two rate sets:
Rate Set 1 — supports a maximum of 8550 bps, with an additional 1050 bits of overhead for
a total max rate of 9600 bps.
Rate Set 2 — supports a maximum of 13,300 bps, with additional overhead bringing the
total transmission rate to 14,400 bps maximum.
CDMA 120 – cdmaOne and CDMA2000 Concepts and Terminology
Section 4: Physical Layer
80-13321-1 X11
© 2002 QUALCOMM Incorporated 4-10
CDMA 120
cdma university Section 4-10 Forward Traffic Channel (continued)
Filter
Offset I PN
Offset Q PN
MUX
Wt
Power
Control
Bit
1.2288
Mcps
Filter
Block
Interleaver
Convolutional
Encoder &Repetition
9600
4800
2400
1200
Rate Set 1:
Rate Set 2:
14400
7200
3600
1800
Long
Code PN
Generator
User Specific Mask
(ESN)
Decimator Decimator
Analog
MMT98010660Ag.emf
Service Options
A Service Option is a service capability of the system. Service Options may be applications such as
voice, data, or fax. TIA/EIA Telecommunications System Bulletin 58 (TSB-58) defines assigned
Service Option numbers:
1 — 8K voice
2 — 8K Mobile Station Loopback
3 — EVRC (Enhanced Variable Rate Coder)
4 — Async Data (Rate Set 1)
5 — Group 3 Fax (Rate Set 1)
6 — Short Message Services (Rate Set 1)
7 — etc.
Categories of Traffic
Primary Traffic — User voice
Secondary Traffic — User data other than voice
Signaling — Call control messaging