Handling cell reselections and state transitions for high-speed downlink packet access
A wireless transmit receive unit (WTRU) is configured to operate in an high speed data packet access (HSDPA) mode in a cell and/or state and to clear HSDPA resources when moving out of the cell and/or state. The WTRU is configured to clear HSDPA resources when conditions to perform high speed downlink shared channel reception are not met.
1. A method of implementing a state transition from a first state to a paging state for a wireless transmit receive unit (WTRU), the method comprising:
checking whether a state transition condition to transition to the paging state for the WTRU has occurred;
checking whether the paging state supports high speed downlink shared channel (HS-DSCH) reception on condition that the state transition condition to transition to the paging state for the WTRU has occurred; and
releasing HS_DSCH resources on condition that the paging state does not support the HS-DSCH reception,
wherein the paging state includes one of a Cell_PCH state or a URA_PCH state, the method further comprising indicating, via a HS_DSCH_RECEPTION_GENERAL variable, a status of the HS-DSCH reception for any of: a Cell_FACH state, the Cell_PCH state, the URA_PCH state or a Cell_DCH state by:
setting the HS_DSCH_RECEPTION_GENERAL variable to FALSE on condition that the first state supports the HS-DSCH reception and the paging state does not support the HS-DSCH reception; and
setting the HS_DSCH_RECEPTION_GENERAL variable to TRUE on condition that the first state does not support the HS-DSCH reception and the paging state supports the HS-DSCH reception.
2. The method of claim 1 , wherein the releasing of the HS_DSCH resources includes any one or more of: (1) stopping the HS-DSCH reception; (2) clearing at least one HS-DSCH radio network temporary identifier (H_RNTI); (3) resetting a medium access control (MAC) entity; (4) releasing a hybrid automated response request (HARQ) resource; or (5) clearing at least one stored information element related to HARQ information.
3. The method of claim 1 , wherein the checking of whether the paging state supports the HS-DSCH reception includes reading a state indicator to determine a HS-DSCH reception status.
4. The method of claim 1 , further comprising reading an information element to determine HS-DSCH reception status in at least one of: system information block (SIB) 5/5bis or SIB 6/6bis.
5. A method of managing a state transition for a wireless transmit receive unit (WTRU), the method comprising:
on condition that: (1) the WTRU transitions to a paging state, (2) high speed downlink shared channel (HS-DSCH) paging system information is not included in one or more broadcasted system information blocks; and (3) a HS_DSCH_RECEPTION_GENERAL variable, indicating a status of HS-DSCH reception for any of states Cell_FACH, Cell_PCH, URA_PCH or Cell_DCH, is set to TRUE:
setting the HS_DSCH_RECEPTION_GENERAL variable to FALSE,
stopping the HS-DSCH reception,
clearing a HS-DSCH radio network temporary identifier (H-RNTI),
resetting a medium access control (MAC) entity, and
releasing a hybrid automated response request (HARQ) resource.
6. The method of claim 5 , wherein the setting of the HS_DSCH_RECEPTION_GENERAL variable includes:
setting the HS_DSCH_RECEPTION_GENERAL variable to FALSE on condition that a state of the WTRU after the state transition does not support the HS-DSCH reception, the method further comprising
setting the HS_DSCH_RECEPTION_GENERAL variable to TRUE on condition that the state of the WTRU after the state transition supports the HS-DSCH reception.
7. A wireless transmit receive unit (WTRU) configured to manage a state transition from a first state to a paging state, comprising:
a processor configured to:
check whether a state transition condition to transition to the paging state for the WTRU has occurred;
check whether the paging state supports high speed downlink shared channel (HS-DSCH) reception on condition that the state transition condition to transition to the paging state for the WTRU has occurred; and
release HS_DSCH resources on condition that the paging state does not support the HS-DSCH reception, wherein:
the paging state includes one of a Cell_PCH state or a URA_PCH state; and
the processor is further configured to:
determine, via a HS_DSCH_RECEPTION_GENERAL variable, a status of the HS-DSCH reception for any of: a Cell_FACH state, the Cell_PCH state, the URA_PCH state or a Cell_DCH state by:
setting the HS_DSCH_RECEPTION_GENERAL variable to FALSE on condition that the first state supports the HS-DSCH reception and the paging state does not support the HS-DSCH reception; and
setting the HS_DSCH_RECEPTION_GENERAL variable to TRUE on condition that the first state does not support the HS-DSCH reception and the paging state supports the HS-DSCH reception.
8. The WTRU of claim 7 , wherein the processor is configured to release the HS_DSCH resources by any one or more of: (1) stopping the HS-DSCH reception; (2) clearing at least one HS-DSCH radio network temporary identifier (H_RNTI); (3) resetting a medium access control (MAC) entity; (4) releasing a hybrid automated response request HARQ resource; or (5) clearing at least one stored information element related to HARQ information.
9. The WTRU of claim 7 , wherein the processor is configured to read a state indicator to determine a HS-DSCH reception status.
10. The WTRU of claim 7 , wherein the WTRU is configured to read an information element to determine HS-DSCH reception status in at least one of: system information block (SIB) 5/5bis or SIB 6/6bis.
11. A wireless transmit receive unit (WTRU) configured to manage a state transition, comprising:
a processor configured to:
on condition that: (1) the WTRU transitions to a paging state, (2) high speed downlink shared channel (HS-DSCH) paging system information is not included in one or more broadcasted system information blocks, and (3) a HS_DSCH_RECEPTION_GENERAL variable, indicating a status of (HS-DSCH) reception for any of states Cell_FACH, Cell_PCH, URA_PCH and Cell_DCH, is set to TRUE:
set the HS_DSCH_RECEPTION_GENERAL variable to FALSE:
stop the HS-DSCH reception,
clear a HS-DSCH radio network temporary identifier (H-RNTI),
reset a medium access control (MAC) entity, and
release hybrid automated response request (HARQ) resources.
12. The WTRU of claim 11 , wherein the processor is configured to:
set the HS_DSCH_RECEPTION_GENERAL variable to FALSE on condition that a state of the WTRU after the state transition does not support the HS-DSCH reception; and
set the HS_DSCH_RECEPTION_GENERAL variable to TRUE on condition that the state of the WTRU after the state transition supports the HS-DSCH reception.
13. The method of claim 5 , wherein the paging state is one of a Cell_PCH state or a URA_PCH state.
14. The WTRU of claim 11 , wherein the paging state is one of a Cell_PCH state or a URA_PCH state.