, Telecom Tigers: 3G Channels

Saturday, July 16, 2011

3G Channels

Hi All,

Here is the list of different channels used in 3G network for transporting information at much faster speed.

These are divided into Logical, Transport & Physical.

UTRA Channels

UTRA FDD radio interface has logical channels, which are mapped to transport channels, which are again mapped to physical channels. Logical to Transport channel conversion happens in Medium Access Control (MAC) layer, which is a lower sublayer in Data Link Layer (Layer 2).

Logical Channels:
  • Broadcast Control Channel (BCCH), Downlink (DL).
  • Paging Control Channel (PCCH), DL
  • Dedicated Control Channel (DCCH), UL/DL
  • Common Control Channel (CCCH), UL/DL
  • Dedicated Traffic Channel (DTCH), UL/DL
  • Common Traffic Channel (CTCH), Unidirectional (one to many)

Transport Channels:
  • Dedicated Transport Channel (DCH), UL/DL, mapped to DCCH and DTCH
  • Broadcast Channel (BCH), DL, mapped to BCCH
  • Forward Access Channel (FACH), DL, mapped to BCCH, CCCH, CTCH, DCCH and DTCH
  • Paging Channel (PCH), DL, mapped to PCCH
  • Random Access Channel (RACH), UL, mapped to CCCH, DCCH and DTCH
  • Uplink Common Packet Channel (CPCH), UL, mapped to DCCH and DTCH
  • Downlink Shared Channel (DSCH), DL, mapped to DCCH and DTCH

Physical Channels:
  • Primary Common Control Physical Channel (PCCPCH), mapped to BCH
  • Secondary Common Control Physical Channel (SCCPCH), mapped to FACH, PCH
  • Physical Random Access Channel (PRACH), mapped to RACH
  • Dedicated Physical Data Channel (DPDCH), mapped to DCH
  • Dedicated Physical Control Channel (DPCCH), mapped to DCH
  • Physical Downlink Shared Channel (PDSCH), mapped to DSCH
  • Physical Common Packet Channel (PCPCH), mapped to CPCH
  • Synchronisation Channel (SCH)
  • Common Pilot Channel (CPICH)
  • Acquisition Indicator Channel (AICH)
  • Paging Indication Channel (PICH)
  • CPCH Status Indication Channel (CSICH)
  • Collision Detection/Channel Assignment Indication Channel (CD/CA-ICH)

Keep checking for new posts till then Happy Reading.


Telecom Tigers Team
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