Paging over a high-speed downlink shared channel
An apparatus and methods are provided for paging in a HSDPA connected mode CELL_PCH or URA_PCH state. Preferably, a WTRU is configured to select various PICH information that is broadcast by a base station. The WTRU is preferably configured to receive paging messages, based on the selected PICH information. In one embodiment, a preferred WTRU is configured to receive paging messages, based on a PICH, a HS-SCCH, and a HS-PDSCH. In another embodiment, a preferred WTRU is configured to receive paging messages, based on a PICH and a HS-PDSCH. In both embodiments, a time delay parameter is preferably used so that the WTRU may listen for either the HS-SCCH or HS-PDSCH for a period of time and return to a sleep mode if no paging message is received.
1. A method for a wireless transmit/receive unit (WTRU) to facilitate paging in high speed downlink packet access (HSDPA) wireless communications, the method comprising:
receiving, from a broadcast, system information indicating a delay between reception of a paging indicator and reception of a message;
when the WTRU is operating in a cell paging channel (CELL_PCH) state or a UTRAN Registration Area (URA) paging channel (URA_PCH) state:
receiving, from a base station, HSDPA associated paging indicator channel (PICH) information elements comprising PICH information,
compiling a list of candidate PICHs for HSDPA after receiving the information elements,
determining a value k corresponding to a number of candidates,
calculating a selection index equal to:
U_RNTI mod k,
where U_RNTI is a universal mobile telecommunications system (UMTS) terrestrial radio access network (UTRAN) radio network transaction identity (U-RNTI) of the WTRU, and
selecting a PICH information from the list of candidate PICHs based on the selection index;
awakening from a sleep mode during paging occasions;
monitoring for the paging indicator over a PICH using the selected PICH information;
monitoring for the message on a high speed physical downlink shared channel (HS-PDSCH) based on the received system information, wherein a maximum delay between the receptions of the paging indicator and the message is pre-determined; and
returning to the sleep mode, if no message is received over the HS-PDSCH.
2. The method of claim 1 , wherein the monitoring for the message comprises: monitoring, after waiting the delay, for reception of the message.
3. A wireless transmit/receive unit (WTRU) configured for high speed downlink packet access (HSDPA) wireless communications, the WTRU comprising a transmit/receive unit and a processor configured to:
receive, from a broadcast, system information indicating a delay between reception of a paging indicator and reception of a message;
when the WTRU is operating in a cell paging channel (CELL_PCH) state or a UTRAN Registration Area (URA) paging channel (URA_PCH) state:
receive, from a base station, HSDPA associated paging indicator channel (PICH) information elements comprising PICH information,
compile a list of candidate PICHs for HSDPA using the information elements,
determine a value k corresponding to a number of candidates,
calculate a selection index equal to:
U_RNTI mod k,
where U_RNTI is a universal mobile telecommunications system (UMTS) terrestrial radio access network (UTRAN) radio network transaction identity (U-RNTI) of the WTRU, and
select a PICH information from the list of candidate PICHs based on the selection index;
awaken from a sleep mode during paging occasions;
monitor for the paging indicator over a PICH using the selected PICH information;
monitor for the message on a high speed physical downlink shared channel (HS-PDSCH) based on the received system information, wherein a maximum delay between the receptions of the paging indicator and the message is pre-determined; and
return to the sleep mode, if no message is received over the HS-PDSCH.
4. The WTRU of claim 3 , wherein the WTRU is configured to:
receive a common high speed downlink shared channel (HS-DSCH) radio network transaction identity (H-RNTI); and
receive the message on the HS-PDSCH using the received common H-RNTI.
5. The WTRU of claim 4 , wherein the WTRU is configured to:
monitor, after waiting the delay, for the reception of the message.
6. A method for a wireless transmit/receive unit (WTRU) to facilitate paging in high speed downlink packet access (HSDPA) wireless communications, the method comprising:
receiving, from a broadcast, system information indicating a delay between reception of a paging indicator and reception using a high speed shared channel;
when the WTRU is in one of a cell paging channel (CELL_PCH) state or a UTRAN Registration Area (URA) paging channel (URA_PCH) state:
receiving, from a base station, HSDPA associated paging indicator channel (PICH) information elements comprising PICH information,
compiling a list of candidate PICHs for HSDPA after receiving the information elements,
determining a value k corresponding to a number of candidates;
calculating a selection index equal to:
U_RNTI mod k,
where U_RNTI is a universal mobile telecommunications system (UMTS) terrestrial radio access network (UTRAN) radio network transaction identity (U-RNTI) of the WTRU, and
selecting a PICH information from the list of candidate PICHs based on the selection index;
awakening from a sleep mode during paging occasions;
monitoring for the paging indicator over a PICH using the selected PICH information;
monitoring for a high speed downlink shared channel (HS-DSCH) radio network transaction identity (H-RNTI);
monitoring the high speed shared channel using the H-RNTI on condition that the H-RNTI is received based on the received system information, wherein a maximum delay between the reception of the paging indicator and the reception using the high speed shared channel is pre-determined; and
returning to the sleep mode, if no H-RNTI is received or the maximum delay has expired.
7. The method of claim 6 , further comprising:
receiving the H-RNTI; and
receiving a high speed physical downlink shared channel (HS-PDSCH) based on the received H-RNTI.
8. A wireless transmit/receive unit (WTRU) configured for high speed downlink packet access (HSDPA) wireless communications, the WTRU comprising:
a transmit/receive unit and a processor configured to:
receive, from a broadcast, system information indicating a delay between reception of a paging indicator and reception using a high speed shared channel;
when the WTRU is in one of a cell paging channel (CELL_PCH) state or a UTRAN Registration Area (URA) paging channel (URA_PCH) state:
receive, from a base station, HSDPA associated paging indicator channel (PICH) information elements comprising PICH information,
compile a list of candidate PICHs for HSDPA after receiving the information elements,
determine a value k corresponding to a number of candidates,
calculate a selection index equal to:
U_RNTI mod k,
where U_RNTI is a universal mobile telecommunications system (UMTS) terrestrial radio access network (UTRAN) radio network transaction identity (U-RNTI) of the WTRU, and
select a PICH information from the list of candidate PICHs based on the selection index;
awaken from a sleep mode during paging occasions;
monitor for the paging indicator over a PICH using the selected PICH information;
monitor for a high speed downlink shared channel (HS-DSCH) radio network transaction identity (H-RNTI);
monitor the high speed shared channel using the H-RNTI on condition that the H-RNTI is received based on the received system information, wherein a maximum delay between the reception of the paging indicator and the reception using the high speed shared channel is pre-determined; and
return to the sleep mode, if no H-RNTI is received or the maximum delay has expired.
9. The WTRU of claim 8 , wherein the WTRU is configured to:
receive the H-RNTI; and
receive a high speed physical downlink shared channel (HS-PDSCH) based on the received H-RNTI.