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CDMA(IS 95) Mobile Station Call Processing

CDMA(IS 95) Mobile Station Call Processing. Lan Kai. Outline. Background Information Mobile Station Call Processing. Background Information. CDMA introduction CDMA channels CDMA protocol layer. Background Information CDMA Introduction. CDMA: Code Division Multiple Access

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CDMA(IS 95) Mobile Station Call Processing

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  1. CDMA(IS 95) Mobile Station Call Processing Lan Kai

  2. Outline • Background Information • Mobile Station Call Processing

  3. Background Information • CDMA introduction • CDMA channels • CDMA protocol layer

  4. Background Information CDMA Introduction • CDMA: • Code Division Multiple Access • Key Technology • Spread-spectrum technology • Synchronization • Power control • Soft hand-off

  5. Background Information CDMA Introduction • Spectral efficiency. • Elimination of frequency re-use planning. • Smoother handoffs through the use of soft handoff. • Conservation of Mobile Station transmit power. • Better performance under multipath fading conditions.

  6. Background InformationCDMA Channels • Codes: • Walsh Code - Forward Channel • Pilot PN Code( Short Code) - Sector Identification • Long Code - Reverse Channel / Identify different user

  7. Background InformationCDMA Channels (Cont.) • Channels • Forward Channels • Pilot Channel • Sync Channel • Page Channel • Forward Traffic Channel

  8. Background InformationCDMA Channels (Cont.) • Channels • Reverse Channels • Access Channel • Reverse Traffic Channel

  9. Background InformationCDMA Protocol Layers

  10. Outline • Background Information • Mobile Station Call Processing

  11. Mobile Station Call ProcessingMajor State Machine

  12. Call Processing---Mobile Station Initialization • Acquire Pilot Channel • Decode Sync Channel • Adjust system time according to the information from Sync Channel • Get Paging Channel information • Why need system-timing synchronization • Long Code state synchronization • System timing synchronization

  13. Call Processing---Mobile Station Initialization

  14. Call Processing---Mobile Station Idle • Receive and Process Paging Channel messages • Process system overhead messages and collect system parameters • Perform idle handoff

  15. Call Processing---Mobile Station Idle • Overhead Messages: • System Parameters Message • CDMA Channel List Message • Extended System Parameters Message • Neighbor List Message • Extended Neighbor List Message • Access Parameters Message • Global Service Redirection Message • General Neighbor List Message

  16. Call Processing---Mobile Station Idle • If mobile loses Paging Channel, it returns System Determination Substate • Upon call origination, termination or other situations that require sending message to the base station, the mobile enter System Access State.

  17. Call Processing---Mobile Station Access

  18. Call Processing---Mobile Station Access • Transition from Idle to System Access • Call origination • Reception of page • Reception of base station order • Registration • Origination of SMS message • Transition from System Access to Traffic • Channel Assignment Message

  19. Call Processing---MS Control on Traffic Channel

  20. Call Processing---MS Control on Traffic Channel • Transmit user data via Forward and Reverse Traffic Channel • Transmit signaling information • Perform Close Loop Power Control • Soft handoff in Conversation Substate • Fade detection

  21. Question?

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