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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