Method and apparatus for radio link synchronization and power control in CELL_—FACH and idle mode

摘要

A method and apparatus for radio link synchronization and power control in CELL_FACH state and idle mode are disclosed. A wireless transmit/receive unit (WTRU) transmits a random access channel (RACH) preamble and receives an acquisition indicator acknowledging the RACH preamble via an acquisition indicator channel (AICH) and an index to an enhanced dedicated channel (E-DCH) resource. The WTRU determines a start of an E-DCH frame. An F-DPCH timing offset is defined with respect to one of the RACH access slot and an AICH access slot carrying the acquisition indicator. A relative F-DPCH timing offset may be signaled to the WTRU and the WTRU may determine a start of an E-DCH frame based on the relative F-DPCH timing offset and timing of an AICH access slot including the acquisition indicator. The WTRU may transmit a dedicated physical control channel (DPCCH) power control preamble before starting an E-DCH transmission.

主权项

1. A method for use in a Node B for performing radio link synchronization, the method comprising:
receiving a random access channel (RACH) preamble; transmitting an acquisition indicator in response to the RACH preamble; transmitting a fractional dedicated physical channel (F-DPCH) according to a F-DPCH time based on a relative F-DPCH timing offset parameter and timing of an acquisition indicator channel (AICH) access slot including the acquisition indicator, wherein the relative F-DPCH timing offset parameter is 256 chips multiplied by an offset value; and receiving a dedicated physical control channel (DPCCH) according to a DPCCH time, the F-DPCH time and the DPCCH time are offset by a predetermined offset.