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.
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| Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
|---|---|---|---|---|---|---|---|---|---|
| Declaration Date | Declaration Reference | Declaring Company | Specification Number | ||||||
| 3G | 13/09/2009 | ISLD-200910-006 | INTERDIGITAL INC |
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| 3G | 30/10/2019 | ISLD-201909-015 | INTERDIGITAL INC |
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Declaration Date | Declaration Reference | Declaring Company | Specification Information | |||||||||
| ----- | ----- | ----- | ----- | ----- |
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Technologies
Multiple access
Product
Not Available
Use Cases
Wireless communication
Services
Not Available
Claim
1. A method for radio link synchronization and power control in CELL_FACH state and idle mode, the method comprising: transmitting a random access channel (RACH) preamble in a randomly selected RACH access slot; receiving an acquisition indicator acknowledging the RACH preamble and an index to an enhanced dedicated channel (E-DCH) resource; determining a dedicated physical control channel (DPCCH) transmission starting time and a fractional dedicated physical channel (F-DPCH) reception starting time based on a relative F-DPCH timing offset parameter and timing of an acquisition indicator channel (AICH) access slot including the acquisition indicator, the DPCCH transmission starting time and the F-DPCH reception starting time being offset by a predetermined offset; receiving an F-DPCH according to the F-DPCH reception starting time; transmitting a DPCCH power control preamble according to the DPCCH transmission starting time; and transmitting an enhanced RACH (E-RACH) message via an E-DCH.
2. The method of claim 1 wherein the WTRU acquires the relative F- DPCH timing offset parameter prior to transmitting the RACH preamble.
3. The method of claim 1 wherein duration and start and stop time of the DPCCH power control preamble are defined in terms of radio slots.
4. The method of claim 1 wherein the F-DPCH reception starting time is calculated by calculating a first offset calculated by adding the relative F- DPCH timing offset parameter multiplied by 256 chips to a predetermined number of chips, and adding the first offset to a beginning of the AICH access slot carrying the acquisition indicator, and the DPCCH transmission starting time is calculated by adding the predetermined offset to the F-DPCH reception starting time.
5. The method of claim 1 wherein the DPCCH transmission starting time is calculated by calculating a first offset calculated by adding the relative F- DPCH timing offset parameter multiplied by 256 chips to a predetermined number of chips, and adding the first offset to a beginning of the AICH access slot carrying the acquisition indicator, and the F-DPCH reception starting time is calculated by subtracting the predetermined offset from the DPCCH transmission starting time.
6. The method of claim 1 wherein a relative F-DPCH timing offset parameter is associated to each E-DCH resource.
7. The method of claim 1 wherein the relative F-DPCH timing offset is received via a system information block (SIB).
8. The method of claim 1 wherein the DPCCH power control preamble starts after crossing at least one F-DPCH frame boundary after the E-DCH resource is assigned.
9. The method of claim 1 wherein the F-DPCH timing offset is fixed and a different F-DPCH slot format is allocated to wireless transmit/receive units (WTRUs) that are allocated with a same channelization code for the F-DPCH
10. The method of claim 1 wherein the start of the E-DCH frame occurs at a specific slot number selected to minimize a delay between the acknowledged RACH preamble transmission and the E-RACH message transmission
11. The method of claim 10 wherein the slot number is selected based on a pre-defined time offset from the received acquisition indicator on the AICH
12. A wireless transmit/receive unit (WTRU) for radio link synchronization and power control in CELL_FACH state and idle mode, the WTRU comprising: a transmit/receive unit configured to transmit a random access channel (RACH) preamble in a randomly selected RACH access slot, receive an acquisition indicator acknowledging the RACH preamble and an index to an enhanced dedicated channel (E-DCH) resource, receive a fractional dedicated channel (F-DPCH), transmit a dedicated physical control channel (DPCCH) power control preamble, and transmit an enhanced RACH (E-RACH) message via an E-DCH; and a controller configured to control transmission of the DPCCH power control preamble and reception of the F-DPCH by determining a DPCCH transmission starting time and an F-DPCH reception starting time based on a relative F- DPCH timing offset and timing of an acquisition indicator channel (AICH) access slot including the acquisition indicator, the DPCCH transmission starting time and the F-DPCH reception starting time being offset by a predetermined offset
13. The WTRU of claim 12 wherein the controller receives the relative F-DPCH timing offset parameter prior to transmitting the RACH preamble
14. The WTRU of claim 12 wherein duration and start and stop time of the DPCCH power control preamble are defined in terms of radio slots
15. The WTRU of claim 12 wherein the controller is configured to calculate the F-DPCH reception starting time by calculating a first offset calculated by adding the relative F-DPCH timing offset parameter multiplied by 256 chips to a predetermined number of chips, and adding the first offset to a beginning of the AICH access slot carrying the acquisition indicator, and calculate the DPCCH transmission starting time by adding the predetermined offset to the F-DPCH reception starting time
16. The WTRU of claim 12 wherein the controller is configured to calculate the DPCCH transmission starting time by calculating a first offset calculated by adding the relative F-DPCH timing offset parameter multiplied by 256 chips to a predetermined number of chips, and adding the first offset to a beginning of the AICH access slot carrying the acquisition indicator, and calculate the F-DPCH reception starting time by subtracting the predetermined offset from the DPCCH transmission starting time
17. The WTRU of claim 12 wherein a relative F-DPCH timing offset parameter is associated to each E-DCH resource
18. The WTRU of claim 12 wherein the F-DPCH timing offset is received via a system information block (SIB)
19. The WTRU of claim 12 wherein the DPCCH power control preamble starts after crossing at least one F-DPCH frame boundary after E-DCH resource is assigned.
20. The WTRU of claim 12 wherein the F-DPCH timing offset is fixed and a different F-DPCH slot format is allocated to WTRUs that are allocated with a same channelization code for the F-DPCH.
21. The WTRU of claim 12 wherein the start of the E-DCH frame occurs at a specific slot number selected to minimize a delay between the acknowledged RACH preamble transmission and the E-RACH message transmission.
22. The WTRU of claim 21 wherein the slot number is selected based on a pre-defined time offset from the received acquisition indicator on the AICH.']
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