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Main UMTS Codes

Here us a summary of the main UMTS FDD codes:

  Synchronisation
Codes
Channelisation
Codes
Scrambling
Codes, UL
Scrambling
Codes, DL
Type Gold Codes

Primary Synchronization Codes (PSC) and Secondary Synchronization Codes (SSC)
Orthogonal Variable Spreading Factor (OVSF) codes

sometimes called
Walsh Codes
Complex-Valued Gold Code Segments (long) or Complex-Valued S(2) Codes (short)

Pseudo Noise (PN) codes
Complex-Valued Gold Code Segments

Pseudo Noise (PN) codes
Length 256 chips 4-512 chips 38400 chips /
256 chips
38400 chips
Duration 66.67 s 1.04 s -
133.34 s
10 ms / 66.67 s 10 ms
Number of codes 1 primary code / 16 secondary codes = spreading factor
4 ... 256 UL,
4 ... 512 DL
16,777,216 512 primary / 15 secondary for each primary code
Spreading No, does not change bandwidth Yes, increases bandwidth No, does not change bandwidth No, does not change bandwidth
Usage To enable terminals to locate and synchronise to the cells' main control channels UL: to separate physical data and control data from same terminal
DL: to separate connection to different terminals in a same cell
Separation of terminal Separation of sectors


Further reading: 3GPP TS 25.201, 25.213, 25.223


  UMTS Overview UMTS Network UMTS Frequencies UMTS Coding UMTS Link Budget
UMTS Security UMTS Codes Synchronisation Co-location
3G Data Speeds UTRA Time Slots UTRA Channels WCDMA Spreading
UMTS QoS Channel Coding Media Formats Compressed Mode
UMTS HSDPA UMTS Handovers Location Services UMTS Power Control
UMTS Overview Cell Search Random Access RCC States Iui Frame Structure
CDMA Overview Call Setup UTRAN Interfaces Paging Virtual Home Environment

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