Methods and apparatus for reordering data in an evolved high speed packet access system

Abstract

Method and apparatus for receiving high speed downlink shared channel (HS-DSCH) transmissions are disclosed. An HS-DSCH medium access control (MAC-ehs) entity receives MAC-ehs protocol data units (PDUs) via a high speed downlink shared channel (HS-DSCH) while in one of Cell_FACH, Cell_PCH, and URA_PCH states. The reordering PDUs included in the MAC-ehs PDUs may be sent to a next processing entity without performing reordering of the PDUs. A certain reordering queue may enter a suspend state upon occurrence of a triggering event and MAC-ehs PDUs distributed to the reordering queue in the suspend state may be forwarded to the next processing entity without performing reordering. MAC-ehs reset procedure may be extended for a certain transmission such that the MAC-ehs reset is performed after receiving a MAC-ehs PDU in a target cell.

What is claimed is: 
     
         1 . A method for a wireless transmit/receive unit (WTRU) to process data, the method comprising:
 receiving data via a high speed downlink shared channel (HS-DSCH); and   sending the data to a next processing entity without performing reordering of the reordering PDUs if a condition has been met.   
     
     
         2 . The method of  claim 1 , wherein the data comprises an HS-DSCH medium access control (MAC-ehs) protocol data unit (PDU) including a reordering PDU. 
     
     
         3 . The method of  claim 1 , wherein the WTRU is in one of a Cell FACH state, a Cell_PCH state, or a URA_PCH state. 
     
     
         4 . The method of  claim 2 , wherein a single hybrid automatic repeat request (HARQ) process is used for receiving the MAC-ehs PDU. 
     
     
         5 . The method of  claim 4 , wherein each MAC-ehs PDU is received more than once and each MAC-ehs PDU retransmission is completed before starting reception of a subsequent MAC-ehs PDU. 
     
     
         6 . The method of  claim 1 , wherein the condition has been met if the data is from a certain priority queue. 
     
     
         7 . The method of  claim 2 , wherein the condition has been met if the received MAC-ehs PDU is associated with a common HS-DSCH radio network temporary identity (H-RNTI). 
     
     
         8 . The method of  claim 1 , wherein the condition has been met if the data is from a certain logical channel. 
     
     
         9 . The method of  claim 8 , wherein the certain logical channel is one of a broadcast control channel (BCCH) or a paging control channel (PCCH). 
     
     
         10 . The method of  claim 2 , wherein the received MAC-ehs PDU is received while the WTRU is in one of a Cell_FACH state, Cell_PCH state, or URA_PCH state, and further comprising setting an initial value of a next_expected_TSN to a lower edge of a receive window (RcvWindow_UpperEdge−RECEIVE_WINDOW_SIZE+1). 
     
     
         11 . A wireless transmit/receive unit (WTRU) comprising:
 a transceiver; and   a processor configured to:   receive data via a high speed downlink shared channel (HS-DSCH); and   send the data to a next processing entity without performing reordering of the reordering PDUs if a condition has been met.   
     
     
         12 . The WTRU of  claim 11 , wherein the data comprises an HS-DSCH medium access control (MAC-ehs) protocol data unit (PDU) including a reordering PDU. 
     
     
         13 . The WTRU of  claim 11 , wherein the WTRU is in one of a Cell_FACH state, a Cell_PCH state, or a URA_PCH state. 
     
     
         14 . The WTRU of  claim 12 , wherein the WTRU includes a single hybrid automatic repeat request (HARQ) process for receiving the MAC-ehs PDU. 
     
     
         15 . The WTRU of  claim 14 , wherein each MAC-ehs PDU is transmitted more than once and each MAC-ehs PDU retransmission is completed before starting transmission of a subsequent MAC-ehs PDU. 
     
     
         16 . The WTRU of  claim 11 , wherein the condition has been met if the data is from a certain priority queue. 
     
     
         17 . The WTRU of  claim 12 , wherein the condition has been met if the received MAC-ehs PDU is associated with a common HS-DSCH radio network temporary identity (H-RNTI). 
     
     
         18 . The WTRU of  claim 11 , wherein the condition has been met if the data is from a certain logical channel. 
     
     
         19 . The WTRU of  claim 18 , wherein the certain logical channel is one of a broadcast control channel (BCCH) or a paging control channel (PCCH). 
     
     
         20 . The WTRU of  claim 12 , wherein the received MAC-ehs PDU is received while the (WTRU) is in one of a Cell_FACH state, Cell_PCH state, or URA_PCH state, and further comprising setting an initial value of a next_expected_TSN to a lower edge of a receive window (RcvWindow_UpperEdge−RECEIVE_WINDOW_SIZE+1).