Method and apparatus for efficient operation of an enhanced dedicated channel

Abstract

A method for processing enhanced dedicated channel data in a wireless transmit/receive unit is described. An interrupt message is received at a medium access control (MAC) layer. The interrupt message is processed by the MAC layer, including at least one of: performing grant processing, on a condition that a grant is included in the interrupt message; obtaining buffer occupancy information; performing transport format combination recovery and elimination; generating a rate request; or multiplexing multiple protocol data units (PDUs) into a single MAC-e PDU.

What is claimed is: 
     
         1 . A method for processing enhanced dedicated channel (E-DCH) data in a wireless transmit/receive unit, comprising:
 receiving an interrupt message at a medium access control (MAC) layer; and   processing the interrupt message by the MAC layer, including at least one of:
 performing grant processing, on a condition that a grant is included in the interrupt message; 
 obtaining buffer occupancy information; 
 performing transport format combination (TFC) recovery and elimination; 
 generating a rate request; or 
 multiplexing multiple protocol data units (PDUs) into a single MAC-e PDU. 
   
     
     
         2 . The method according to  claim 1 , wherein the interrupt message includes at least one of:
 an absolute grant with indication on a condition that the interrupt message is received with a primary or secondary enhanced uplink radio network temporary identity,   a relative grant from serving and non-serving cells,   a hybrid automatic repeat request indicator of a previous transmission, or   a current dedicated physical control channel power level.   
     
     
         3 . The method according to  claim 1 , wherein the performing grant processing includes deriving a current scheduling grant and a corresponding remaining transmit power for E-DCH transmission. 
     
     
         4 . The method according to  claim 3 , wherein the performing TFC recovery and elimination includes determining E-DCH TFCs that are allowed with the remaining transmit power for E-DCH transmission. 
     
     
         5 . The method according to  claim 1 , wherein obtaining the buffer occupancy information includes:
 sending a request to calculate the buffer occupancy; and   receiving a response to the request, the response including the calculated buffer occupancy.   
     
     
         6 . The method according to  claim 5 , wherein the request is sent to a PDU processor or a radio link control layer. 
     
     
         7 . The method according to  claim 1 , wherein the generating the rate request includes requesting a resource from a Node B. 
     
     
         8 . The method according to  claim 1 , wherein multiplexing multiple PDUs includes:
 multiplexing multiple MAC-d PDUs into MAC-es PDUs; and   multiplexing one or more MAC-es PDUs into a single MAC-e PDU.   
     
     
         9 . A wireless transmit/receive unit (WTRU) for processing enhanced dedicated channel (E-DCH) data, the WTRU comprising:
 a medium access control (MAC) layer configured to:
 receive an interrupt message; and 
 process the interrupt message, including at least one of: 
 perform grant processing, on a condition that a grant is included in the interrupt message;
 obtain buffer occupancy information; 
 perform transport format combination (TFC) recovery and elimination; 
 generate a rate request; or 
 multiplex multiple protocol data units (PDUs) into a single MAC-e PDU. 
 
   
     
     
         10 . The WTRU according to  claim 9 , wherein the interrupt message includes at least one of:
 an absolute grant with indication on a condition that the interrupt message is received with a primary or secondary enhanced uplink radio network temporary identity,   a relative grant from serving and non-serving cells,   a hybrid automatic repeat request indicator of a previous transmission, or   a current dedicated physical control channel power level.   
     
     
         11 . The WTRU according to  claim 9 , wherein the MAC layer is further configured to derive a current scheduling grant and a corresponding remaining transmit power for E-DCH transmission as part of the grant processing. 
     
     
         12 . The WTRU according to  claim 11 , wherein the MAC layer is further configured to determine E-DCH TFCs that are allowed with the remaining transmit power for E-DCH transmission as part of the TFC recovery and elimination. 
     
     
         13 . The WTRU according to  claim 9 , wherein the MAC layer is further configured to:
 send a request to calculate the buffer occupancy; and   receive a response to the request, the response including the calculated buffer occupancy, as part of obtaining the buffer occupancy information.   
     
     
         14 . The WTRU according to  claim 13 , wherein the MAC layer is further configured to send the request to a PDU processor or a radio link control layer. 
     
     
         15 . The WTRU according to  claim 9 , wherein the MAC layer is further configured to request a resource from a Node B, as part of generating the rate request. 
     
     
         16 . The WTRU according to  claim 9 , wherein the MAC layer is further configured to:
 multiplex multiple MAC-d PDUs into MAC-es PDUs; and   multiplex one or more MAC-es PDUs into a single MAC-e PDU, as part of multiplexing the multiple PDUs.