7 Access Control in Connected Mode (CELL_FACH, CELL_PCH and URA_PCH)

25.3003GPPGeneral descriptionRelease 17Stage 2TSUniversal Terrestrial Radio Access Network (UTRAN)

For FDD, certain categories of UEs may be configured for Access Control in connected mode. This feature allows for a network to differentiate and control accesses of UE for DTCH transmission in CELL_FACH state and for DCCH/CCCH due to uplink data transmission in CELL_PCH state or URA_PCH state, when uplink congestion is being experienced.

The network may differentiate among the UE population by assigning UEs to one of 16 defined Access Groups. The network can indicate the identity of the access group to which the UE is assigned via RRC dedicated signalling.

For each network assigned Access Group, the network can indicate in System Information whether the UEs in CELL_FACH state, CELL_PCH state or URA_PCH state in that group are Blocked or Unblocked for DTCH data transmission and for DCCH/CCCH due to uplink data transmission. The System Information Block containing the Access Group information is scheduled by the network only during periods of uplink congestion. A UE in CELL_FACH state, CELL_PCH state or URA_PCH state which has data to transmit and has an access group identity will reacquire the System Information Block containing the Access Group information based on the expiration of a timer.

UEs in CELL_PCH (without seamless transition to CELL_FACH state) or URA_PCH (without seamless transition to CELL_FACH) are not allowed to initiate Cell Update procedure triggered due to DTCH data transmission with cause "uplink data transmission" when the Access Group of the UE is Blocked.

UEs in CELL_PCH (with seamless transition to CELL_FACH state) or URA_PCH (with seamless transition to CELL_FACH state) are not allowed to initiate Measurement Report procedure triggered due to DTCH data transmission when the Access Group of the UE is Blocked.

A UE in CELL_FACH state, CELL_PCH state or URA_PCH state which is blocked for DTCH transmission and for DCCH/CCCH due to data transmission in the uplink is permitted to transmit uplink RLC Control PDUs.