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 for cell reselection implemented by a wireless transmit receive unit (WTRU), the method comprising:
defining a single high speed downlink shared channel (HS-DSCH) reception variable (HS_DSCH_RECEPTION_GENERAL) indicating the status of HS-DSCH reception for the following states: Cell_FACH, Cell_PCH, URA_PCH and Cell_DCH;
setting the HS_DSCH_RECEPTION_GENERAL variable to TRUE on the condition that HS-DSCH procedures are ongoing;
setting the HS_DSCH_RECEPTION_GENERAL variable to FALSE on the condition that a new cell following a cell reselection does not support HS-DSCH reception; and
releasing HS-DSCH resources on the condition that the new cell does not support HS-DSCH reception.
2. The method as in claim 1 , wherein releasing HS_DSCH resources comprises:
stopping high speed synchronization control channel (HS-SCCH) reception;
stopping high speed downlink shared channel (HS-DSCH) reception;
clearing radio network temporary identifiers (RNTIs);
resetting a medium access control (MAC) entity;
releasing hybrid automated response request (HARQ) resources; and
clearing any stored information elements related to HARQ information.
3. The method as in claim 1 , further comprising reading a medium access control (MAC) state indicator to determine HS-DSCH reception.
4. The method as in claim 1 , further comprising reading an information element (IE) to determine HS-DSCH reception status in at least one of the following:
system information block (SIB) type 5 or SIB type 5bis.
5. The method as in claim 4 , wherein the IE is HS-DSCH common system information.
6. The method as in claim 4 , wherein the IE is HS-DSCH paging system information.
7. A wireless transmit receive unit (WTRU) comprising:
a processor configured to:
define a single high speed downlink shared channel (HS-DSCH) reception variable (HS_DSCH_RECEPTION_GENERAL) indicating the status of HS-DSCH reception for the following states: Cell_FACH, Cell_PCH, URA_PCH and Cell_DCH;
set the HS_DSCH_RECEPTION_GENERAL variable to TRUE on the condition that HS-DSCH procedures are ongoing;
set the HS_DSCH_RECEPTION_GENERAL variable to FALSE on the condition that a new cell following a cell reselection does not support HS-DSCH reception; and
release HS-DSCH resources on the condition that the new cell does not support HS-DSCH reception.
8. The WTRU as in claim 7 , wherein the processor is further configured to:
stop high speed synchronization control channel (HS-SCCH) reception;
stop high speed downlink shared channel (HS-DSCH) reception;
clear radio network temporary identifiers (RNTIs);
reset a medium access control (MAC) entity;
release a hybrid automated response request (HARQ) resources; and
clear any stored information elements related to HARQ information.
9. The WTRU as in claim 7 , further comprising reading a medium access control (MAC) state indicator to determine HS-DSCH reception.
10. The WTRU as in claim 7 , further comprising reading an information element (IE) to determine HS-DSCH reception status in at least one of the following:
system information block (SIB) type 5 or SIB type 5bis.
11. The WTRU as in claim 10 , wherein the IE is HS-DSCH common system information.
12. The WTRU as in claim 10 , wherein the IE is HS-DSCH paging system information.