Abstract
A method and apparatus are used for detecting a radio link (RL) failure and a post verification process. A quality of a downlink fractional dedicated physical channel (F-DPCH) is monitored once a transmission on an enhanced dedicated channel (E-DCH) has begun. It is determined whether the quality of the downlink F-DPCH is below a predefined threshold. If the quality is below the predefined threshold then an occurrence of an RL failure is declared and a transmission over the E-DCH in a cell forward access channel (CELL_FACH) state is terminated. In a case of the post verification failure E-DCH resources are released.
Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | |||||
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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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Technologies
Product
Use Cases
Services
Claim
1. A method implemented in a wireless transmit receive unit (WTRU) for handling a radio link (RL) failure, the method comprising:
determining that a criterion for RL failure is met when operating in a cell forward access channel (CELL FACH) state; and
upon determining that the criterion for RL failure is met, releasing enhanced dedicated channel (E-DCH) resource and performing a backoff procedure prior to attempting another random uplink (UL) access, the backoff procedure comprising:
waiting a predefined amount of time prior to starting a timer; and
while the timer is running, checking whether a cell reselection criterion is met, wherein upon determining that the cell reselection criterion is met, cell reselection is performed and the timer is stopped, and wherein upon expiry of the timer the cell reselection criterion is not met, a new random UL access is attempted without performing the cell reselection.
2. The method of claim 1 wherein the timer is a backoff timer.
3. The method of claim 1, wherein the new random UL access is attempted on a current cell.
4. A wireless transmit receive unit (WTRU), the WTRU comprising:
a processor; and
a memory comprising instructions that when executed by the processor cause the WTRU to:
determine that a criterion for radio link (RL) failure is met when operating in a cell forward access channel (CELL FACH) state; and
upon determining that the criterion for RL failure is met, release enhanced dedicated channel (E-DCH) resource and perform a backoff procedure prior to attempting another random uplink (UL) access, the backoff procedure comprising:
waiting a predefined amount of time prior to starting a timer; and
while the timer is running, checking whether a cell reselection criterion is met, wherein upon determining that the cell reselection criterion is met, cell reselection is performed and the timer is stopped, and wherein upon expiry of the timer the cell reselection criterion is not met, a new random UL access is attempted without performing the cell reselection.
5. The WTRU of claim 4, wherein the timer is a backoff timer.
6. The WTRU of claim 4, wherein the new random UL access is attempted on a current cell.
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Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.