Method and apparatus for cell update while in an enhanced Cell_FACH state

摘要

A method and apparatus for cell update while in a CellFACH state are disclosed. After selecting a target cell, system information is read from the target 5 cell including high speed downlink shared channel (HS-DSCH) common system information. A radio network temporary identity (RNTI) received in a source cell is cleared and a variable HSDSCHRECEPTION is set to TRUE. An HS-DSCH medium access control (MAC-hs) entity is configured based on the HS-DSCH common system information. High speed downlink packet access (HSDPA) 10 transmission is then received in the target cell. A CELL UPDATE message is sent to notify of a cell change. The HSDPA transmission may be received using a common H-RNTI broadcast in the system information, a reserved H-RNTI as requested in a CELL UPDATE message, or a temporary identity which is a subset of a U-RNTI. The MAC-hs entity may be reset. A WTRU IN AN ENHANCED CELLFACH STATE SELECTS A TARGET CELL, THE WTRU STOPS TRANSMITTING AND RECEIVING ON THE SOURCE CELL AND CLEARS THE C-RNTI AND H -RNT USED IN THE SOURCE CELL. c:-206 THE WTRU READS SYSTEM INFORMATION IN THE TARGET CELL AND DETERMINES THE TARGET NODE - B CAPABILITY. THE WTRU PERFORMS A MAC -HS RESET (OPTIONAL). J THE VTRU SETS UP THE HSDPA COMMUNICATION AS WELL AS THE RACH COMMUNICATION, AND SENDS A CELL UPDATE MESSAGE TO THE UTRAN TO NOTIFY OF A CELL CHANGE, THE UTRAN RECEIVES THE CELL UPDATE MESSAGE, STOPS SENDING DATA TO THE SOURCE NODE B, NOTIFIES THE SOURCE NODE B TO DELETE AN OLD MAC.-HS ENTITY, AND SETS UP A NEW MAC -HS ENTITY IN THE TARGET NODE B. 1- 214 THE UTRAN SENDS A CELL UPDATE CONFIRM MESSAGE TO THE WTRU THROUGH THE TARGET NODE B WITH SETUP INFORMATION FOR HSDPA COMMUNICATION. THE WTRU SETS UP THE HSDPA WITH TE CONFIGURATION INFORMATION INCLUDED IN THE CELL UPDATE CONFIRM MESSAGE. THE WTRU SENDS AN RRC RESPONSE MESSAGE. F1G. 2 c END