1. CDMA Technical Training
Fundamental of CDMA technology
Technical background for Wavecom Wismo Quick Q2338 CDMA Module
Q&A

2. IS-2000 Air Interface Forward Link
Base
Station
Pilot (F-PICH)
Mobile
Station
Paging (F-PCH)
Sync (F-SYNC)
Fundamental (F-FCH)
Supplemental (F-SCH)
Quick Paging Channel (F-QPCH)

3. Forward Link Channels Forward Pilot Channel (F-PICH)
Shared by the mobiles
Provide timing and phase information of the cell
Used for cell acquisition and handoff by the mobile
Forward Sync Channel (F-SYNC)
Used by the mobiles to acquire initial time synchronization
Forward Paging Channel (F-PCH)
Used to send control information and paging messages
Forward Fundamental Channel (F-FCH)
Traffic channel carrying voice and data
Forward Supplemental Channel (F-SCH)
Used (but not limited) to carrying high speed data

4. IS-2000 Air Interface Reverse Link
Mobile
Station
Base
Station
Pilot (R-PICH)
Access (R-ACH) or R-CCCH
Dedicated Control (R-DCCH)
Fundamental (R-FCH)
Supplemental (R-SCH)

5. Reverse Link Channels
Reverse Access Channel (R-ACH) and Reverse Common Control Channel (R-CCCH)
Used for communication of layer 3 and MAC messages from the mobile to the base station
Reverse Pilot Channel (R-PICH)
Time tracking
Power control measurements
Reverse Dedicated Control Channel (R-DCCH)
Used for call set up
Reverse Fundamental Channel (R-FCH)
Voice and data traffic channel
Reverse Supplemental Channel (R-SCH)
Used for data calls
MSM5105 supports up to 78.6 kbps R-SCH rate

6. CDMA Band Classes Band Class 0 (Cellular Band) Band Class 1 (PCS Band)
Mobile Tx: 824 MHz – MHz
Mobile Rx: MHz – MHz
Band Class 1 (PCS Band)
1850 MHz – MHz
1930 MHz – MHz

7. Paging Channel Message
CDMA Call Processing
Synch Channel MSG Received
Pilot Channel Acquired
MS Acquires System Timing
Power-Up
Mobile Station
Initialization
Mobile Station
Idle State
Unable to receive
Paging Channel Message
Receipt of
Acknowledgement
to other than
Origination or
Page Response
message.
End Use of
Traffic Channel
Receives Page
Originates, or
Registers
System Access
State
MS Control on
Traffic Channel State
Directed to Traffic Channel

8. CDMA Handoffs
The process whereby a Mobile Station moves to acquiring a new traffic channel
CDMA implements various types of handoff schemes to reduce call drop rate
Soft Handoff
Softer Handoff
Soft-softer Handoff
Hard handoff

9. Type of CDMA Handoffs
Softer Handoff: Mobile Station communicates with sectors within the cell.
Soft Handoff: “Make before Break”. Mobile communicates with two cells.
Soft-softer Handoff: Mobile Station communicates with two sectors within a cell and another sector or cell.

10. Soft Handoff Advantage
Reduce call drop rate – “Make before Break”
Improve capacity
Path diversity allows mobile to reduce transmit power to the level only the closest cell needs
Less power means less interference
Less interference means more mobiles can access the network

11. Power Control Reverse Link Power Control Forward Link Power Control
BTS instructs Mobile Station to raise or reduce power level based on received signal quality
Forward Link Power Control
BTS raise or reduce its transmit power level based on FER reports from Mobile Stations

12. Reverse Link Open Loop Power Control
Mobile station adjusts its transmit power level based on received signal quality.
Mobile transmit power based on Open Loop Power Control
Tx = -Rx-K+(NOM.PWR-16*NOM.PWR.EXT)+Sum of Access Probe Corrections (dBm)
Rx: Mean input receive power
NOM.PWR: nominal power (dB), part of system parameter
NOM.PWR.EXT: nominal power for extended handoff, part of system parameter
K: 76 for cellular and 73 for PCS

13. Reverse Link Closed Loop Power Control
Closed loop power control attempts to compensate for multipath fading losses
BTS instructs Mobile to adjust its transmit power in a 1dB step size: “0” = -1 dB,
“1”=+1dB
Response time: 1.25ms

14. Forward Link Power Control
BTS collect FER report from the Mobile Station and makes decision on adjusting its transmit power
Prevents excessive interference to other cells while maintaining a desired Fram Error Rate

15. Power Control Advantage
Reduce uneccessary interference resulting in improving capacity
Extend battary talk time
Less power = less RF polution

16. Q2338 Hardware SpecificationRF
RF block diagram
Transmitter features and specifications
Receiver feature and specification
Baseband
System connector
Memory specification
Power consumption

17. Q2338 Hardware Specification RF

18. Q2338 Hardware Specification Baseband

19. Q2338 Software Architecture Features Summary
IS2000 Rel.0 1X, IS-95A/B protocols
Two way SMS
Voice (8K EVRC, 13K QCELP)
Packet (153kbps) and Asynchronous data services (9.6kbps,14.4kbps)
Fax (Class 2.0 Group 3)
R-UIM/SIM, UART (up to 230kbps), USB
TCP/IP/PPP and Sockets
Secure Socket Layer
OTASP/OTAPA
Authentication and Encryption
Voice Privacy
System Determination 1.0 and 2.0, Preferred Roaming Support
Mobile IP
Voice Recognition (optional, extra license)

20. Q2338 Software Architecture Tools
Flash Downloader
RF Calibration (auto and manual)
RF tester (In-house use only)
UPST (Universal Product Support Tool)
UDM (Universal Diagnostic Monitor)
ESN Tool
Remote Development Environment (Remote MMI/Application Simulation and Development)

21. Q2338 CDG Testing Will comply with US CDG testing process CDG 1 CDG 2
Third party test house
Internal testing using Spirent C2K AirAccess Test System
CDG 2
Submitting to Interoperability Labs at Lucent, Nortel and Motorola
CDG 3
Cooperation with the carriers for field testing

22. Q2338 CDG 1 Testing In house Testing with Spirent
Testing based on IS-98D
RF Parametric Tests: Receiver Sensitivity, for example
Basic Call Processing Test: Idle Handoff test, for example
Serves as entrance criteria to CDG 2

23. Q2338 CDG 2 Testing Infrastructure interoperability testing
Testing based on IS-898
Handoff tests
POTS tests
Asynchronous Data tests
High Speed Data tests
Fax test

24. Q2338 CDG 3 Testing Field testing with Carriers
Formal CDG 3 testing requires Carrier participation as certain network parameters need to be adjusted

25. CDMA Testing in China Same testing standards as in the US
Need “Network Access Certificate” from MII:
CDG Testing in MTNet
CDG 1 type testing in China TTL
Emission testing in China TTL
User trial done by China TTL

26. Q2338 Integration Host Device Q2338 Module RF Antenna External Antenna
UART
R-UIM
MIC/SPK
LCD
60 Pin System Connector
60 Pin System Connector

27. Q2338 Integration: RF Antenna
Three options available
Soldering on directly provide that antenna already has 50 ohm line
Matcing circuit
Open space available for matching circuit if not 50 ohm line
RADIALL Sprint board connection