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CDMA Technical Training

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

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CDMA Technical Training

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

  2. IS-2000 Air InterfaceForward 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 InterfaceReverse 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) • Mobile Tx: 824 MHz – 848.97 MHz • Mobile Rx: 869.04MHz – 893.97 MHz • Band Class 1 (PCS Band) • 1850 MHz – 1909.95 MHz • 1930 MHz – 1989.95 MHz

  7. 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 • 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 Specification • RF • RF block diagram • Transmitter features and specifications • Receiver feature and specification • Baseband • System connector • Memory specification • Power consumption

  17. Q2338 Hardware SpecificationRF

  18. Q2338 Hardware SpecificationBaseband

  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 • 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

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