UMTS channels

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The UMTS channels are communication channels used by third generation (3G) wireless Universal Mobile Telecommunications System (UMTS) networks. [1][2][3]

UMTS channels can be divided into three levels:

  • Physical
  • Transport
  • Logical
UMTS Channels
Level Abrev. Full Name Description UL/DL Ref
3_LOGICAL BCCH broadcast control channel For broadcasting system control information DL 5.3.1.1.1[4]
3_LOGICAL CCCH common control channel Supports common procedures required to establish a dedicated link with the network. UL/DL 5.3.1.1.1[4]
3_LOGICAL CTCH common traffic channel A point-to-multipoint unidirectional channel for transfer of dedicated user information for all or a group of specified UEs. DL 5.3.1.1.1[4]
3_LOGICAL DCCH dedicated control channel A point-to-point dedicated channel for transmiting dedicated control information between a UE and the network. UL/DL 5.3.1.1.1[4]
3_LOGICAL DTCH dedicated traffic channel A point-to-point channel dedicated to one UE for the transfer of user information. UL/DL 5.3.1.1.1[4]
3_LOGICAL PCCH paging control channel Transfers paging information. Used when the network does not know the location cell of the UE or the UE is in sleep mode. DL 5.3.1.1.1[4]
2_TRANSPORT BCH broadcast channel Used to broadcast cell and system information. DL 4.1.2.1[5]
2_TRANSPORT CPCH common packet channel Used for transmission of bursty data traffic. Shared by the UEs in a cell. Employs fast power control. NOTE - removed after R5. UL 4.1.2.5[6]
2_TRANSPORT DCH dedicated channel Allocated to an individual user and typically used to support a speech channel. UL/DL 4.1.1.1[5]
2_TRANSPORT DSCH downlink shared channel Carries dedicated user data or control information. May be shared by several UEs. Associated with a downlink DCH. NOTE - removed after R5. DL 4.1.2.6[6]
2_TRANSPORT E-DCH enhanced dedicated channel HSUPA Enhanced (high-speed) dedicated uplink transport channel. UL 4.1.1.2[5]
2_TRANSPORT FACH forward access channel Carries control information to UEs in a cell (may also be used to transmit packet data). Makes up the RACH/FACH pair. DL 4.1.2.2[5]
2_TRANSPORT HS-DSCH high speed downlink shared channel The HSDPA transport channel. Shared by several UEs. DL 4.1.2.7[5]
2_TRANSPORT PCH paging channel Carries paging procedure data (for sleep mode) used by network to establish connection to UE. Always transmitted over entire cell. DL 4.1.2.3[5]
2_TRANSPORT RACH random access channel Used to gain access to the system when first attaching to it (can also carry packet data). Makes up the RACH/FACH pair. Always received from entire cell. Entails a collision risk. Transmitted using open loop power control. UL 4.1.2.4[5]
1_PHYSICAL AICH acquisition indicator channel Carries acquisition indicators. AI corresponds to signature on the PRACH. Fixed rate (sf=256). DL 5.3.3.7[5]
1_PHYSICAL CD/CA-ICH collision detection/channel assignment indicator channel Carries CD Indicator (CDI) or CD Indicator/CA Indicator (CDI/CAI). Fixed rate (sf=256). NOTE - removed after R5. DL 5.3.3.9[6]
1_PHYSICAL CPICH common pilot channel Provides the default phase reference for demodulation of the other downlink channels and enables channel estimation.  Uses a pre-defined bit sequence.  Fixed rate (sf=256). DL 5.3.3.11[5]
1_PHYSICAL CSICH cpch status indication channel Carries CPCH status information. Fixed rate (sf=256). NOTE - removed after R5. DL 5.3.3.11[6]
1_PHYSICAL DPCCH dedicated physical control channel Carries physical layer control information including known pilot bits to support channel estimation, transmit power-control (TPC) commands, feedback information (FBI) and, optionally, transport-format combination indicator (TFCI). UL/DL 5.3.3.11[5]
1_PHYSICAL DPDCH dedicated physical data channel Carries DCH data. Used with DPCCH. May be multiple DPDCHs on each radio link. UL/DL 5.3.3.11[5]
1_PHYSICAL E-AGCH enhanced absolute grant channel [HSUPA] Establishes absolute power lever for UE transmission on E-DCH. Fixed rate (sf=256). DL 5.3.3.14[5]
1_PHYSICAL E-DPCCH enhanced dedicated physical control channel [HSUPA] Control information associated with E-DCH. Transmitted along with E-DPDCH. UL/DL 5.2.1.3[5]
1_PHYSICAL E-DPDCH enhanced dedicated physical data channel [HSUPA] Carries the E-DCH transport channel. Transmitted along with E-DPCCH. UL 5.2.1.3[5]
1_PHYSICAL E-HICH enhanced hybrid indicator channel [HSUPA] Dedicated channel which carries the E-DCH hybrid ARQ acknowledgement indicator. Fixed rate (sf=128). DL 5.3.2.5[5]
1_PHYSICAL E-RGCH enhanced relative grant channel [HSUPA] Carries the uplink E-DCH relative grants. Fixed rate (sf=128). DL 5.3.2.4[5]
1_PHYSICAL HS-DPCCH high speed dedicated physical control channel [HSDPA] Carries feedback signalling related to HS-DSCH including HARQ-ACK and CQI. UL 5.2.1.2[5]
1_PHYSICAL HS-PDSCH high speed physical downlink shared channel [HSDPA] Carries actual user data for HS-DSCH. DL 5.3.3.13[5]
1_PHYSICAL HS-SCCH high speed shared control channel [HSDPA] Contains downlink signalling information related to HS-DSCH. Fixed rate (sf=128). DL 5.3.3.12[5]
1_PHYSICAL P-CCPCH primary common control physical channels Carries BCH (Broadcast Channel). There is one P-CCPCH within a cell used to carry synchronization and broadcast information for all users. DL 5.3.3.3[5]
1_PHYSICAL PCPCH physical common packet channel Carries CPCH (Common Packet Channel). NOTE - removed after R5. UL 5.2.2.2[6]
1_PHYSICAL PDSCH physical downlink shared channel Carries DSCH. NOTE - removed after R5. DL 5.3.3.6[6]
1_PHYSICAL PICH page indicator channel Carries PCH. Fixed rate (sf=256). DL 5.3.3.10[5]
1_PHYSICAL PRACH physical random access channel Carries RACH (Random Access Channel). UL 5.2.2.1[5]
1_PHYSICAL S-CCPCH secondary common control physical channels Carries FACH (Forward Access Channel) and PCH (Paging Channel). DL 5.3.3.4[5]
1_PHYSICAL SCH synchronization channel Used for cell search and conveying synchronization information. Consists of two sub-channels - Primary and Secondary SCH. DL 5.3.3.5[5]

See also

References

  1. ↑ Holma, Harry and Antti Toskala (2004). WCDMA for UMTS. Wiley. ISBN 0-470-87096-6. 
  2. ↑ Harri Holma and Antti Toskala (2006). HSDPA/HSUPA for UMTS: High Speed Radio Access for Mobile Communications. ISBN 0-470-01884-4. 
  3. ↑ Dahlman, Erik and Stefan Parkvall, Johan Skold, Per Beming (2006). 3G Evolution HSPA and LTE for Mobile Broadband. Wiley. ISBN 978-0-12-374538-5. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 "TS 25.301 Radio interface protocol architecture (FDD)". 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.11 5.12 5.13 5.14 5.15 5.16 5.17 5.18 5.19 5.20 5.21 5.22 5.23 "TS 25.211_PHYSICAL channels and mapping of transport channels onto physical channels (FDD) (R7)". 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 "TS 25.211_PHYSICAL channels and mapping of transport channels onto physical channels (FDD) (R5)". 

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