Uplink data transmission:

For FDD, if the variable H_RNTI is not set, and for TDD:

• if the UE is in URA_PCH or CELL_PCH STATE; and
• if the UE has uplink RLC data PDU or uplink RLC control PDU on RB1 or upwards to transmit: perform cell update using the cause “uplink data transmission“.

Paging response:

• if the criteria for performing cell update with the cause specified above. are not met; and
• if the UE in URA_PCH or CELL_PCH state, receives a PAGING TYPE 1 .message fulfilling the conditions for initiating a cell update procedure. perform cell update using the cause “paging response“.

Radio link failure:

• if none of the criteria for performing cell update with the causes specified above in the current subclause is met:
• if the UE is in CELL_DCH state and the criteria for radio link failure are ,or
• if the transmission of the UE CAPABILITY INFORMATION message fails. perform cell update using the cause “radio link failure“.

MBMS ptp RB request:

• if none of the criteria for performing cell update with the causes specified above in the current subclause is met; and
• if the UE is in URA_PCH, Cell_PCH or Cell_FACH state; and
• if the UE should perform cell update for MBMS ptp radio bearer request, perform cell update using the cause “MBMS ptp RB request“.

Re-entering service area:

• if none of the criteria for performing cell update with the causes specified above in the current subclause is met; and
• if the UE is in CELL_FACH or CELL_PCH state; and
• 2> if the UE has been out of service area and re-enters service area before T307 or T317 expires:
• 3> perform cell update using the cause “re-entering service area“.

RLC UNRECOVERABLE error:

• if none of the criteria for performing cell update with the causes specified above in the current subclause is met; and
• if the UE detects RLC unrecoverable error [16] in an AM RLC entity: perform cell update using the cause “RLC unrecoverable error“.

Cell reselection:

• if none of the criteria for performing cell update with the causes specified above in the current subclause is met:
• if the UE is in CELL_FACH or CELL_PCH state and the UE performs cell re-selection; or
• if the UE is in CELL_FACH state and the variable C_RNTI is empty: perform cell update using the cause “cell reselection“.

Periodical cell update:

• if none of the criteria for performing cell update with the causes specified above in the current subclause is met; and
• if the UE is in CELL_FACH or CELL_PCH state; and
• if the timer T305 expires; and
• if the criteria for “in service area” and
• if PERIODIC updating has been configured by T305 in the IE “UE Timers and CONSTANTS in CONNECTED mode” set to any other value than “infinity”: perform cell update using the cause “periodical cell update“.

MBMS reception:

• if none of the criteria for performing cell update with the causes specified above in the current subclause is met; and
• if the UE is in URA_PCH, Cell_PCH or Cell_FACH state; and
• if the UE should perform cell update for MBMS counting , perform cell update using the cause “MBMS reception“.

Uplink data transmission:

For FDD, if the variable H_RNTI is not set, and for TDD:

Paging response:

Radio link failure:

MBMS ptp RB request:

Re-entering service area:

RLC unrecoverable error:

Cell reselection:

Periodical cell update:

MBMS reception: