US2018035395A1PendingUtilityA1

Method and apparatus for radio link synchronization and power control in cell_fach and idle mode

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Assignee: INTERDIGITAL PATENT HOLDINGS INCPriority: Dec 31, 2007Filed: Oct 9, 2017Published: Feb 1, 2018
Est. expiryDec 31, 2027(~1.4 yrs left)· nominal 20-yr term from priority
Inventors:Benoit PelletierPaul MarinierChristopher R. CaveIn H. KimRocco Di Girolamo
H04W 56/0085H04L 47/12H04W 56/0005H04W 52/50H04W 74/08H04W 56/0045H04W 52/38H04W 52/36H04W 56/001
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Claims

Abstract

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.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A method for use in a wireless transmit/receive unit (WTRU), the method comprising:
 transmitting a random access channel (RACH) preamble, wherein the preamble is transmitted in at least one of a subset of access slots;   receiving a fractional dedicated physical channel (F-DPCH) at a reception time based on a relative F-DPCH timing offset value and a timing of an acquisition indicator channel (AICH) access slot; and   transmitting a dedicated physical control channel (DPCCH) and an enhanced dedicated channel (E-DCH) after reception of the F-DPCH, wherein the DPCCH is transmitted at a transmission time that is offset from the reception time of the F-DPCH by a predetermined offset.   
     
     
         2 . The method of  claim 1  further comprising receiving a system information block (SIB) including common E-DCH system information. 
     
     
         3 . The method of  claim 2 , wherein the SIB includes an indicator of a subset of access slots for transmitting a RACH preamble associated with an E-DCH. 
     
     
         4 . The method of  claim 1 , wherein the RACH preamble is transmitted via the E-DCH. 
     
     
         5 . The method of  claim 1  further comprising receiving an acquisition indicator in response to the RACH preamble. 
     
     
         6 . The method of  claim 1 , wherein the relative F-DCH timing offset parameter is 256 chips multiplied by the offset value. 
     
     
         7 . The method of  claim 1  further comprising transmitting a power control preamble. 
     
     
         8 . The method of  claim 7  wherein the power control preamble is transmitted using a common uplink scrambling code. 
     
     
         9 . The method of  claim 7 , wherein the power control preamble is transmitted before transmitting the DPCCH. 
     
     
         10 . The method of  claim 1 , wherein the WTRU is in the CELL_FACH state. 
     
     
         11 . A method for use in a wireless transmit/receive unit (WTRU), the method comprising:
 a transmitter configured to transmit a random access channel (RACH) preamble, wherein the preamble is transmitted in at least one of a subset of access slots; and   a receiver configured to receive a fractional dedicated physical channel (F-DPCH) at a reception time based on a relative F-DPCH timing offset value and a timing of an acquisition indicator channel (AICH) access slot;   wherein the transmitter is further configured to transmit a dedicated physical control channel (DPCCH) and an enhanced dedicated channel (E-DCH) after reception of the F-DPCH, wherein the DPCCH is transmitted at a transmission time that is offset from the reception time of the F-DPCH by a predetermined offset.   
     
     
         12 . The WTRU of  claim 11 , wherein the receiver is further configured to receive a system information block (SIB) including common E-DCH system information. 
     
     
         13 . The WTRU of  claim 12 , wherein the SIB includes an indicator of a subset of access slots for transmitting a RACH preamble associated with an E-DCH. 
     
     
         14 . The WTRU of  claim 11 , wherein the RACH preamble is transmitted via the E-DCH. 
     
     
         15 . The WTRU of  claim 11 , wherein the receiver is further configured to receive an acquisition indicator in response to the RACH preamble. 
     
     
         16 . The WTRU of  claim 11 , wherein the relative F-DCH timing offset parameter is 256 chips multiplied by the offset value. 
     
     
         17 . The WTRU of  claim 11  further comprising transmitting a power control preamble. 
     
     
         18 . The WTRU of  claim 17  wherein the power control preamble is transmitted using a common uplink scrambling code. 
     
     
         19 . The WTRU of  claim 17 , wherein the power control preamble is transmitted before transmitting the DPCCH. 
     
     
         20 . The WTRU of  claim 11 , wherein the WTRU is in the CELL_FACH state.

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