Method and apparatus for monitoring for a radio link failure
AssigneeInterDigital Patent Holdings, Inc.
InventorsPaul Marinier, Stephen E. Terry, Jean-Louis Gauvreau, Shankar Somasundaram, Peter S. Wang, Ghyslain Pelletier, Marian Rudolf
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Abstract
Methods and apparatus are described for monitoring for a radio link failure in a long term evolution-advanced (LTE-A) system operated with carrier aggregation. The methods include criteria for determining radio link failure, recovery events, and the actions that a wireless transmit/receive unit (WTRU) may take upon the occurrence of such events.
Claims12
A method, implemented by a wireless transmit/receive unit (WTRU), of monitoring for a radio link failure, the method comprising:
- counting out-of-synch indications from each of a plurality of carriers with a physical downlink control channel (PDCCH) configured for the WTRU,
- wherein the plurality of carriers with PDCCH configured includes a primary carrier with PDCCH configured associated with a base station and at least one secondary carrier with PDCCH configured associated with another base station;
- initiating a recovery timer in the WTRU on a condition that a predefined number of out-of-synch indications from the at least one secondary carrier with PDCCH configured was counted;
- counting in-synch indications from the at least one secondary carrier with PDCCH configured;
- and
- transmitting a notification of radio link failure associated with the at least one secondary carrier with PDCCH configured to the primary carrier with PDCCH configured on a condition that the recovery timer expires before a predefined number of in-synch indications is counted.
A method, implemented by a wireless transmit/receive unit (WTRU), of monitoring for a radio link failure, the method comprising:
- counting out-of-synch indications from a primary component carrier and each of a plurality of secondary component carriers activated for the WTRU,
- wherein the primary component carrier and the plurality of secondary component carriers are associated with different base stations;
- initiating a recovery timer in the WTRU on a condition that a predefined number of out-of-synch indications from at least one of the secondary component carriers was counted;
- counting in-synch indications from the at least one of the secondary component carriers;
- and
- transmitting a radio link failure associated with the at least one of the secondary component carriers to the primary component carrier on a condition that the recovery timer expires before a predefined number of in-synch indications is counted.
Dependencies are inferred from the claim text.