1. A method for paging a wireless transmit/receive unit (WTRU) in a CELL-PCH and URA-PCH states, the method comprising: a WTRU sending an indication indicating an enhanced paging channel (PCH) capability of receiving a high speed downlink shared channel (HS-DSCH) in CELL_PCH and URA_PCH states.

2. The method of claim 1 further comprising: the WTRU sending a second indication indicating an enhanced forward access channel (FACH) capability of receiving the HS-DSCH in a CELL_FACH state.

3. The method of claim 1 wherein the indication is included in one of a CELL UPDATE message, a URA UPDATE message, and a UTRAN MOBILITY INFORMATION CONFIRM message.

4. The method of claim 3 wherein the CELL UPDATE message and the URA UPDATE message including the indication are sent if capabilities of a new cell are different than capabilities of an old cell.

5. The method of claim 3 wherein the URA UPDATE message including the indication is sent if a new cell supporting enhanced PCH is controlled by a controlling radio network controller (CRNC) that is different than a serving radio network controller (SRNC).

6. The method of claim 5 wherein the WTRU determines that the CRNC is different than the SRNC if an SRNC identity in a UTRAN radio network temporary identity (U-RNTI) is different than 12 most significant bits of a cell identity.

7. The method of claim 3 wherein the WTRU sends the URA UPDATE message including the indication if a WTRU has roamed from a cell that does not support enhanced FACH and/or enhanced PCH to a cell that supports enhanced FACH and/or enhanced PCH.

8. The method of claim 3 wherein the WTRU sends the URA UPDATE message including the indication if a new cell is controlled by a controlling radio network controller (CRNC) that is different from a CRNC that controlled a previous cell.

9. The method of claim 1 wherein the WTRU determines if a serving radio network controller (SRNC) to which the WTRU is connected supports enhanced PCH by maintaining an internal variable indicating SRNC enhanced FACH and/or PCH capability

10. The method of claim 9 wherein the internal variable is set to FALSE if any one of following conditions is satisfied: if a new UTRAN radio network temporary identity (U-RNTI) is assigned to the WTRU, if a WTRU radio network controller (RRC) state changes from CELL_DCH to URA_PCH, if a WTRU RRC state changes from CELL_FACH to URA_PCH, if a WTRU RRC state changes from CELL_PCH to URA_PCH, if a WTRU RRC state changes from URA_PCH to CELL_PCH or CELLJFACH or CELL_DCH, if the WTRU receives an RRC message in a cell that does not support enhanced PCH and/or enhanced FACH and a new U-RNTI is assigned, and if the WTRU receives an RRC message while in CELL_DCH state and a new U-RNTI is assigned

11. The method of claim 9 wherein the internal variable is set to TRUE when at least one of following conditions is satisfied: if the WTRU successfully receives a URA UPDATE CONFIRM message after having triggered a transfer of a URA UPDATE message including the indication, if the WTRU successfully receives a URA UPDATE CONFIRM message after having transferred a URA UPDATE message in a cell that supports enhanced FACH and/or enhanced PCH, if the WTRU successfully receives a CELL UPDATE CONFIRM message after having transferred a CELL UPDATE message in a cell that supports enhanced FACH and/or enhanced PCH, if the WTRU roams to a cell that supports enhanced FACH and/or enhanced PCH and the cell is controlled by a serving radio network controller (SRNC) to which the WTRU is connected, and if the WTRU initiates an RRC connection in a cell that supports enhanced FACH and/or enhanced PCH

12. A method for paging a wireless transmit/receive unit (WTRU) in a CELL-PCH and URA-PCH states, the method comprising: receiving an indication indicating whether the WTRU has an enhanced paging channel (PCH) capability of receiving a high speed downlink shared channel (HS-DSCH) in CELL_PCH and URA_PCH states; and paging the WTRU based on the indication

13. The method of claim 12 wherein the indication is included in a PAGING REQUEST message from a serving radio network controller (SRNC)

14. The method of claim 13 wherein the indication is present in the PAGING REQUEST message only if the WTRU has an enhanced PCH capability

15. The method of claim 13 wherein the indication is presented in the PAGAGIN REQUEST message only if the SRNC has an enhanced PCH capability

16. The method of claim 13 wherein the indication is provided independently of a paging area choice

17. The method of claim 13 wherein the indication is provided only if a paging area choice is UTRAN routing area (URA)

18. The method of claim 13 wherein if the indication is not present in the PAGING REQUEST message, the WTRU is paged over a PCH/secondary common control physical channel (S-CCPCH)

19. The method of claim 13 wherein if the indication is not present in the PAGING REQUEST message, the WTRU is paged over both an HS-DSCH and a PCH/ secondary common control physical channel (S-CCPCH).

20. A method for paging a wireless transmit/receive unit (WTRU) in a CELL_PCH and URA_PCH states, the method comprising: receiving a PAGING REQUEST message for the WTRU; and paging the WTRU over both a high speed downlink shared channel (HS- DSCH) and a paging channel (PCH)/secondary common control physical channel (S-CCPCH) if a capability of the WTRU of receiving an HS-DSCH in CELL_PCH and URA_PCH states is not known.

21. A method for paging a wireless transmit/receive unit (WTRU) in a CELL_PCH and URA_PCH states, the method comprising: decoding a paging indication over a paging indicator channel (PICH); monitoring both a high speed downlink shared channel (HS-DSCH) and a paging channel (PCH)/secondary common control physical channel (S-CCPCH) in one of CELL_PCH and URA_PCH states; and receiving a paging message.

22. The method of claim 21 wherein the WTRU monitors both the HS- DSCH and the PCH/S-CCPCH if a serving cell supports paging over HS-DSCH.

23. The method of claim 22 wherein the WTRU monitors both the HS- DSCH and the PCH/S-CCPCH if the WTRU has roamed from a cell that does not support enhanced CELL_FACH to a cell that supports enhanced CELL-FACH.

24. The method of claim 22 wherein the WTRU monitors both the HS- DSCH and the PCH/S-CCPCH if the WTRU is unaware of capabilities of a serving radio network controller (SRNC) to which the WTRU is connected.

25. A method for paging a wireless transmit/receive unit (WTRU) in a CELL-PCH and URA_PCH states, the method comprising: a WTRU determining whether a serving radio network controller (SRNC) has an enhanced forward access channel (FACH) capability of supporting reception of a high speed downlink shared channel (HS-DSCH) in a CELL_FACH state; and the WTRU performing configuration to receive a message over an HS- DSCH based on the capability of the SRNC.

26. The method of claim 25 wherein the WTRU, in an IDLE mode, determines that the SRNC to which the WTRU is attempting to connect has the enhanced FACH capability if a selected cell has the enhanced FACH capability.

27. The method of claim 25 wherein the WTRU, in a radio resource control (RRC) connected mode, determines that the SRNC has the enhanced FACH capability if the WTRU has configured itself for reception of HS-DSCH in CELL_FACH state at any point throughout a life of the RRC connection with the SRNC.

28. The method of claim 25 wherein the WTRU, in a radio resource control (RRC) connected mode, determines that the SRNC has the enhanced FACH capability if the WTRU has been configured to operate using any third generation partnership (3GPP) Release 7 feature while connected to the SRNC.

29. The method of claim 25 wherein the WTRU obtains the capability of the SRNC via dedicated radio resource control (RRC) signaling.

30. The method of claim 25 wherein the WTRU obtains the capability of the SRNC via broadcast signaling that provides a list of radio network controllers (RNCs) that support enhanced CELL_FACH.

31. A method for paging a wireless transmit/receive unit (WTRU) in a CELL-PCH and URA_PCH states, the method comprising: a WTRU receiving a message indicating whether the WTRU should support an enhanced paging channel (PCH) capability of receiving a high speed downlink shared channel (HS-DSCH) in CELL_PCH and URA_PCH states; and the WTRU performs configuration for receiving a paging message based on the message.

32. The method of claim 31 wherein the WTRU monitors the S-CCPCH when a serving radio network subsystem (SRNS) does not support enhanced PCH.

33. The method of claim 32 wherein the WTRU monitors the S-CCPCH when the SRNS supports enhanced PCH but HS-DSCH paging system information is not broadcast in a cell.

34. The method of claim 31 wherein the configuration is valid throughout a life of a connection to a serving radio network controller (SRNC).

35. The method of claim 34 further comprising: recognizing that serving radio network subsystem (SRNS) relocation takes place; and reevaluating support for enhanced PCH capability when SRNS relocation takes place.

36. A method for paging a wireless transmit/receive unit (WTRU) in a CELL_PCH and URA_PCH states, the method comprising: a WTRU determining whether to monitor a paging channel (PCH)/secondary common control physical channel (S-CCPCH) or a high speed downlink shared channel (HS-DSCH) to receive a paging message in one of CELL_PCH and URA_PCH states based on capabilities of the WTRU and a cell and a condition related to a reception method that the WTRU used during a previous communication with a network in a current radio resource control (RRC) connection; and the WTRU performs configuration for receiving the paging message based on the determination.

37. The method of claim 36 wherein the WTRU monitors only the HS- DSCH in CELL_PCH and URA_PCH states if the WTRU has sent an RRC message, since beginning of the RRC connection, with a radio network controller (RNC) that supports an enhanced PCH capability.

38. The method of claim 36 wherein the WTRU monitors the PCH/S- CCPCH from the time when the WTRU successfully sends an RRC message to an RNC that does not support the enhanced PCH capability.

39. The method of claim 36 wherein the WTRU monitors the PCH/S- CCPCH for the paging message if the WTRU receives information indicating that a serving radio network controller (SRNC) does not support an enhanced PCH.

40. A method for paging a wireless transmit/receive unit (WTRU) in a CELL_PCH and URA_PCH states, the method comprising: receiving a URA UPDATE message including an indication indicating an enhanced paging channel (PCH) capability of receiving a high speed downlink shared channel (HS-DSCH) in CELL_PCH and URA_PCH states; determining a capability mismatch in a WTRU and a serving radio network controller (SRNC); sending a relocation request message to initiate serving radio network subsystem (SRNS) relocation; performing SRNS relocation; and sending a URA UPDATE CONFIRM message to the WTRU over an HS- DSCH .

41. The method of claim 40 wherein the capability mismatch is detected by a drift radio network controller (DRNC) and the SRNS relocation is initiated by the DRNC.

42. The method of claims 40 wherein the capability mismatch is detected by the SRNC and the SRNS relocation is initiated by the SRNC.

43. A wireless transmit/receive unit (WTRU) configured to receive a paging message in a CELL_PCH and URA_PCH states, the WTRU comprising: a controller for sending an indication indicating an enhanced paging channel (PCH) capability of receiving a high speed downlink shared channel (HS- DSCH) in CELL_PCH and URA_PCH states; and a transceiver for receiving a message over an HS-DSCH.

44. The WTRU of claim 43 wherein the controller is configured to send a second indication indicating an enhanced forward access channel (FACH) capability of receiving the HS-DSCH in a CELL_FACH state.

45. The WTRU of claim 43 wherein the indication is included in one of a CELL UPDATE message, a URA UPDATE message, and a UTRAN MOBILITY INFORMATION CONFIRM message.

46. The WTRU of claim 45 wherein the CELL UPDATE message and the URA UPDATE message including the indication are sent if capabilities of a new cell are different than capabilities of an old cell.

47. The WTRU of claim 45 wherein the URA UPDATE message including the indication is sent if a new cell supporting enhanced PCH is controlled by a controlling radio network controller (CRNC) that is different than a serving radio network controller (SRNC).

48. The WTRU of claim 47 wherein the controller determines that the CRNC is different than the SRNC if an SRNC identify in a UTRAN radio network temporary identity (U-RNTI) is different than 12 most significant bits of a cell identity.

49. The WTRU of claim 45 wherein the controller sends the URA UPDATE message including the indication if a WTRU has roamed from a cell that does not support enhanced FACH and/or enhanced PCH to a cell that supports enhanced FACH and/or enhanced PCH.

50. The WTRU of claim 45 wherein the controller sends the URA UPDATE message including the indication if a new cell is controlled by a controlling radio network controller (CRNC) that is different from a CRNC that controlled a previous cell.

51. The WTRU of claim 45 wherein the controller sends the URA UPDATE message including the indication if the WTRU is unaware if a serving radio network controller (SRNC) to which it is connected supports enhanced FACH and/or enhanced PCH.

52. The WTRU of claim 45 wherein the UTRAN MOBILITY INFORMATION CONFIRM message is sent in response to an indication that serving radio network subsystem (SRNS) relocation has taken place.

53. The WTRU of claim 43 wherein the controller determines if a serving radio network controller (SRNC) to which the WTRU is connected supports enhanced PCH by maintaining an internal variable indicating SRNC enhanced FACH and/or PCH capability.

54. The WTRU of claim 53 wherein the internal variable is set to FALSE if any one of following conditions is satisfied: if a new UTRAN radio network temporary identity (U-RNTI) is assigned to the WTRU, if a WTRU radio network controller (RRC) state changes from CELL_DCH to URA_PCH, if a WTRU RRC state changes from CELL_FACH to URA_PCH, if a WTRU RRC state changes from CELL_PCH to URA_PCH, if a WTRU RRC state changes from URA_PCH to CELL_PCH or CELL_FACH or CELL_DCH, if the WTRU receives an RRC message in a cell that does not support enhanced PCH and/or enhanced FACH and a new U-RNTI is assigned, and if the WTRU receives an RRC message while in CELL-DCH state and a new U-RNTI is assigned.

55. The WTRU of claim 53 wherein the internal variable is set to TRUE when at least one of following conditions is satisfied: if the WTRU successfully receives a URA UPDATE CONFIRM message after having triggered a transfer of a URA UPDATE message including the indication, if the WTRU successfully receives a URA UPDATE CONFIRM message after having transferred a URA UPDATE message in a cell that supports enhanced FACH and/or enhanced PCH, if the WTRU successfully receives a CELL UPDATE CONFIRM message after having transferred a CELL UPDATE message in a cell that supports enhanced FACH and/or enhanced PCH, if the WTRU roams to a cell that supports enhanced FACH and/or enhanced PCH and the cell is controlled by a serving radio network controller (SRNC) to which the WTRU is connected, and if the WTRU initiates an RRC connection in a cell that supports enhanced FACH and/or enhanced PCH.

56. An apparatus for paging a wireless transmit/receive unit (WTRU) in a CELL_PCH and URA-PCH states, the apparatus comprising: a controller for receiving an indication indicating whether the WTRU has an enhanced paging channel (PCH) capability of receiving a high speed downlink shared channel (HS-DSCH) in CELL_PCH and URA_PCH states and page the WTRU based on the indication; and a transceiver for sending a paging message.

57. The apparatus of claim 56 wherein the indication is included in a PAGING REQUEST message from a serving radio network controller (SRNC).

58. The apparatus of claim 57 wherein the indication is present in the PAGING REQUEST message only if the WTRU has an enhanced PCH capability.

59. The apparatus of claim 57 wherein the indication is provided independently of a paging area choice.

60. The apparatus of claim 57 wherein the indication is provided only if a paging area choice is UTRAN routing area (URA).

61. The apparatus of claim 56 wherein an HS-DSCH PAGING REQUEST message is used to page the WTRU over an HS-DSCH, and a PAGING REQUEST message is used to page the WTRU over a PCH/secondary common control physical channel (S-CCPCH).

62. The apparatus of claim 57 wherein if the indication is not present in the PAGING REQUEST message, the paging message is sent over a PCH/secondary common control physical channel (S-CCPCH).

63. The apparatus of claim 57 wherein if the indication is not present in the PAGING REQUEST message, the paging message is sent over both an HS- DSCH and a PCH/ secondary common control physical channel (S-CCPCH).

64. An apparatus for paging a wireless transmit/receive unit (WTRU) in a CELL_PCH and URA_PCH states, the apparatus comprising: a transceiver for receiving a PAGING REQUEST message for the WTRU; and a controller for paging the WTRU over both a high speed downlink shared channel (HS-DSCH) and a paging channel (PCH)/secondary common control physical channel (S-CCPCH) if a capability of the WTRU of receiving an HS- DSCH in CELL_PCH and URA_PCH states is not known.

65. A wireless transmit/receive unit (WTRU) for receiving a paging message in a CELL_PCH and URA_PCH states, the WTRU comprising: a transceiver for receiving and decoding a paging indication over a paging indicator channel (PICH) and receiving a paging message; and a controller for controlling the transceiver to monitor both a high speed downlink shared channel (HS-DSCH) and a paging channel (PCH)/secondary common control physical channel (S-CCPCH) in one of CELL-PCH and URA_PCH states.

66. The WTRU of claim 65 wherein the controller controls the transceiver to monitor both the HS-DSCH and the PCH/S-CCPCH if a serving cell supports paging over HS-DSCH.

67. The WTRU of claim 66 wherein the controller controls the transceiver to monitor both the HS-DSCH and the PCH/S-CCPCH if the WTRU has roamed from a cell that does not support enhanced CELL-FACH to a cell that supports enhanced CELL_FACH.

68. The WTRU of claim 66 wherein the controller controls the transceiver to monitor both the HS-DSCH and the PCH/S-CCPCH if the WTRU is unaware of capabilities of a serving radio network controller (SRNC) to which the WTRU is connected.

69. A wireless transmit/receive unit (WTRU) for receiving a paging message in a CELL_PCH and URA_PCH states, the WTRU comprising: a transceiver; and a controller for determining whether a serving radio network controller (SRNC) has an enhanced forward access channel (FACH) capability of supporting reception of a high speed downlink shared channel (HS-DSCH) in a CELL_FACH state and configuring the transceiver to receive a message over an HS-DSCH based on the capability of the SRNC.

70. The WTRU of claim 69 wherein the controller, in an IDLE mode, determines that the SRNC to which the WTRU is attempting to connect has the enhanced FACH capability if a selected cell has the enhanced FACH capability.

71. The WTRU of claim 69 wherein the controller, in a radio resource control (RRC) connected mode, determines that the SRNC has the enhanced FACH capability if the WTRU has configured itself for reception of HS-DSCH in CELL_FACH state at any point throughout a life of the RRC connection with the SRNC.

72. The WTRU of claim 69 wherein the controller, in a radio resource control (RRC) connected mode, determines that the SRNC has the enhanced FACH capability if the WTRU has been configured to operate using any third generation partnership (3GPP) Release 7 feature while connected to the SRNC.

73. The WTRU of claim 69 wherein the controller obtains the capability of the SRNC via dedicated radio resource control (RRC) signaling.

74. The WTRU of claim 69 wherein the controller obtains the capability of the SRNC via broadcast signaling that provides a list of radio network controllers (RNCs) that support enhanced CELL_FACH.

75. A wireless transmit/receive unit (WTRU) for receiving a paging message in a CELLJPCH and URA_PCH states, the WTRU comprising: a transceiver; and a controller for receiving a message indicating whether the WTRU should support an enhanced paging channel (PCH) capability of receiving a high speed downlink shared channel (HS-DSCH) in CELL_PCH and URA_PCH states and configuring the transceiver for receiving a paging message based on the message.

76. The WTRU of claim 75 wherein the controller controls the transceiver to monitor the S-CCPCH when a serving radio network subsystem (SRNS) does not support enhanced PCH.

77. The WTRU of claim 76 wherein the controller controls the transceiver to monitor the S-CCPCH when the SRNS supports enhanced PCH but HS-DSCH paging system information is not broadcast in a cell.

78. The WTRU of claim 75 wherein the configuration is valid throughout a life of a connection to a serving radio network controller (SRNC).

79. The WTRU of claim 78 wherein the controller recognizes that serving radio network subsystem (SRNS) relocation takes place and reevaluates support for enhanced PCH capability when SRNS relocation takes place.

80. A wireless transmit/receive unit (WTRU) for receiving a paging message in a CELL_PCH and URA_PCH states, the WTRU comprising: a transceiver; and a controller for determining whether to monitor a paging channel (PCH)/secondary common control physical channel (S-CCPCH) or a high speed downlink shared channel (HS-DSCH) to receive a paging message in one of CELL_PCH and URA.PCH states based on capabilities of the WTRU and a cell and a condition related to a reception method that the WTRU used during a previous communication with a network in a current radio resource control (RRC) connection and configures the transceiver for receiving the paging message.

81. The WTRU of claim 80 wherein the controller configures the transceiver to monitor only the HS-DSCH in CELL_PCH and URA_PCH states if the WTRU has sent an RRC message, since beginning of the RRC connection, with a radio network controller (RNC) that supports an enhanced PCH capability.

82. The WTRU of claim 80 wherein the controller configures the transceiver to monitor the PCH/S-CCPCH from the time when the WTRU successfully sends an RRC message to an RNC that does not support the enhanced PCH capability.

83. The WTRU of claim 80 wherein the controller configures the transceiver to monitor the PCH/S-CCPCH for the paging message if the controller receives information indicating that a serving radio network controller (SRNC) does not support an enhanced PCH.

84. An apparatus for paging a wireless transmit/receive unit (WTRU) in a CELLJPCH and URA_PCH states, the apparatus comprising: a transceiver; and a controller for receiving a URA UPDATE message including an indication indicating an enhanced paging channel (PCH) capability of receiving a high speed downlink shared channel (HS-DSCH) in CELL.PCH and URA_PCH states, determining a capability mismatch in a WTRU and a serving radio network controller (SRNC), sending a relocation request message to initiate serving radio network subsystem (SRNS) relocation, performing SRNS relocation, and sending a URA UPDATE CONFIRM message to the WTRU over an HS-DSCH.']