WCDMA : Introduction

1
WCDMA Introduction

• Multiple Access Direct-Sequence Code Division
  Multiple Access (3.84Mcps)
• Frame Duration 10ms
• Multi-rate Concept Variable spreading factor
  and multi-code
• Service Multiplexing Multiple services with
  different quality of service requirements
  multiplexed on one connection
• Channels Transport Channels (Higher Layer)
• Physical Channels (Physical Layer

2
WCDMA Packet Channels
3
WCDMA Packet Scheduling

• Code Division Scheduling
• Time Division Scheduling
• Shared Channel Scheduling

Bit Rate
Shared Channels
User 3
Dedicated Channels
User 2
User 1
Time
4
Multiplexing
Transport Ch. 1
Transport Ch. 2
Transport Block Error Indication
Transport Block
TFI
Transport Block
TFI
Transport Block
TFI
Transport Block Error Indication
TFI
Transport Block Error Indication
TFCI
Coding Multiplexing
TFCI Decoding
Decoding Demultiplexing
Physical Control Ch.
Physical Control Ch.
Physical Data Ch.
Physical Data Ch.
TRANSMITTER
RECEIVER
5
Uplink Multiplexing
CRC Attachment
DPDCH1
DPDCH2
DPDCH3
Block Concatenation/ Segmentation
Physical Channel Matching
Channel Coding
Second Interleaving
Radio Frame equalization
Other transport channels
First Interleaving
Physical Channel Segmentation
Radio Frame Segmentation
Transport Channel Multiplexing
Rate Matching