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UMTS RCC States


Picture below shows the RRC states in UTRA RRC Connected Mode, including transitions between UTRA RRC connected mode and GSM connected mode for CS domain services, and between UTRA RRC connected mode and GSM/GPRS packet modes for PS domain services. It also shows the transitions between Idle Mode and UTRA RRC Connected Mode and furthermore the transitions within UTRA RRC connected mode.

RCC States
RRC States and State Transitions including GSM


CELL_DCH state is characterised by:
  • A dedicated physical channel is allocated to the UE in uplink and downlink.
  • The UE is known on cell level according to its current active set.
  • Dedicated transport channels, downlink and uplink (TDD) shared transport channels, and a combination of these transport channels can be used by the UE.

    CELL_FACH state is characterised by:
  • No dedicated physical channel is allocated to the UE.
  • The UE continuously monitors a FACH in the downlink.
  • The UE is assigned a default common or shared transport channel in the uplink (e.g. RACH) that it can use anytime according to the access procedure for that transport channel.
  • The position of the UE is known by UTRAN on cell level according to the cell where the UE last made a cell update.
  • In TDD mode, one or several USCH or DSCH transport channels may have been established.

    CELL_PCH state is characterised by:
  • No dedicated physical channel is allocated to the UE.
  • The UE selects a PCH with the algorithm, and uses DRX for monitoring the selected PCH via an associated PICH.
  • No uplink activity is possible.
  • The position of the UE is known by UTRAN on cell level according to the cell where the UE last made a cell update in CELL_FACH state.

    URA_PCH State is characterised by:
  • No dedicated channel is allocated to the UE.
  • The UE selects a PCH with the algorithm, and uses DRX for monitoring the selected PCH via an associated PICH.
  • No uplink activity is possible.
  • The location of the UE is known on UTRAN Registration area level according to the URA assigned to the UE during the last URA update in CELL_FACH state.



    Call reselection procedures:

    Cell reselection

    States and procedures in the cell reselection process in connected mode

    When a cell reselection is triggered, the UE evaluates the cell reselection criteria based on radio measurements, and if a better cell is found that cell is selected, procedure Cell reselection. If the change of cell implies a change of radio access technology, the RRC connection is released, and the UE enters idle mode of the other RAT. If no suitable cell is found in the cell reselection procedure, the UE eventually enters idle mode.

    When an Initial cell reselection is triggered, the UE shall use the Initial cell reselection procedure to find a suitable cell. One example where this procedure is triggered is at radio link failure, where the UE may trigger an initial cell reselection in order to request re-establishment of the RRC connection. If the UE is unable to find a suitable cell, the UE eventually enters idle mode.


    Further reading: 3GPP TS 25.331


      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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