METHOD AND APPARATUS FOR CONSISTENT LBT FAILURE DETECTION AND RECOVERY
A method and apparatus for consistent LBT failure detection and recovery. The method is applicable to a terminal equipment, and the method includes when a higher layer receives an LBT failure indication from lower layer(s) and a counter for consistent LBT failure detection is equal to a first value, or, when a higher layer receives an LBT failure indication from lower layer(s) and a counter for consistent LBT failure detection is greater than or equal to a first value and there exists no triggered consistent LBT failures in an active BWP in a serving cell of a terminal equipment, triggering the consistent LBT failures of the active BWP in the serving cell.
1 . An apparatus for consistent LBT failure detection and recovery, applicable to a terminal equipment, the apparatus comprising:
a first resetting unit configured to, for an activated serving cell configured with lbt-FailureRecoveryConfig, when a first condition is satisfied, reset a counter for consistent LBT failure detection,
the first condition comprising at least one of the following conditions:
consistent LBT failure of an active BWP in a serving cell has been triggered, or there exists consistent LBT failure on an active BWP in a serving cell;
an event causing triggered consistent LBT failure(s) to be cancelled occurs;
triggered consistent LBT failure(s) are cancelled in the serving cell, wherein one of the consistent LBT failures is triggered for an active BWP in the serving cell when LBT failure indication is received from lower layers and the counter for consistent LBT failure detection is equal or greater than lbt-FailureInstanceMaxCount;
an event causing instructing a multiplexing and assembly procedure to generate an LBT failure MAC CE occurs;
a multiplexing and assembly procedure is instructed to generate an LBT failure MAC CE;
an event causing a scheduling request for LBT failure MAC CE to be triggered occurs; or
a scheduling request for LBT failure MAC CE has been triggered.
2 . The apparatus according to claim 1 , wherein the event causing triggered consistent LBT failure(s) to be cancelled comprises at least one of the following that:
a BWP is deactivated;
a BWP is deactivated and is configured with consistent LBT failure recovery;
a BWP is deactivated and is configured with an LBT failure recovery configuration parameter;
a BWP is deactivated and is configured with a counter for consistent LBT failure detection;
information of LBT failure is transmitted;
consistent LBT failure has been triggered and is not cancelled, and a random access procedure is considered successfully completed;
a secondary cell is deactivated, or a message for deactivating a secondary cell is received, or a timer associated with a secondary cell expires;
MAC entity receives a physical downlink control channel (PDCCH) for BWP switching of the serving cell, and there is no ongoing random access procedure associated with the serving cell or an ongoing random access procedure associated with the serving cell is successfully completed upon reception of physical downlink control channel addressed to cell radio network temporary identifier (C-RNTI); or
upon reception of RRC configuration or RRC reconfiguration for BWP switching.
3 . The apparatus according to claim 1 , wherein the event causing instructing a multiplexing and assembly procedure to generate an LBT failure MAC CE comprises at least one of the following events that:
consistent LBT failure has been triggered and not cancelled in a special cell (SpCell), and uplink shared channel (UL-SCH) resources are available for a new transmission in the special cell and these UL-SCH resources can accommodate the LBT failure MAC CE plus its sub-header as a result of logical channel prioritization (LCP); or
consistent LBT failure has been triggered and not cancelled in at least one secondary cell, and uplink shared channel (UL-SCH) resources are available for a new transmission in a serving cell for which consistent LBT failure has not been triggered and these UL-SCH resources can accommodate the LBT failure MAC CE plus its sub-header as a result of logical channel prioritization (LCP).
4 . The apparatus according to claim 1 , wherein the event causing a scheduling request for LBT failure MAC CE to be triggered comprises:
consistent LBT failure has been triggered and not cancelled in at least one secondary cell, and uplink shared channel (UL-SCH) resources are not available for a new transmission in a serving cell for which consistent LBT failure has not been triggered and these UL-SCH resources can accommodate the LBT failure MAC CE plus its sub-header as a result of logical channel prioritization (LCP).
5 . The apparatus according to claim 1 , wherein reset a counter for consistent LBT failure detection comprises: set the counter to 0 .
6 . The apparatus according to claim 1 , wherein,
one of the lower layers of the terminal equipment is a physical layer.
7 . An apparatus for consistent LBT failure detection and recovery, applicable to a terminal equipment,
the apparatus comprising at least one of the following units:
a first indicating unit configured to, when consistent LBT failure is cancelled, indicate to generate information of consistent LBT failure;
a second indicating unit configured to indicate cell information or frequency information of consistent LBT failure to a network device; or
a first stopping unit configured to stop an ongoing consistent LBT failure recovery procedure.
8 . The apparatus according to claim 7 , wherein the second indicating unit comprises:
a second triggering unit configured to trigger consistent LBT failure in a serving cell and not cancelled; and
a third indicating unit configured to indicate cell information or frequency information of consistent LBT failure to the network device.
9 . The apparatus according to claim 8 , wherein the second triggering unit,
consistent LBT failure has been triggered and not cancelled in a special cell (SpCell), and uplink shared channel (UL-SCH) resources are available for a new transmission in the special cell and these UL-SCH resources can accommodate the LBT failure MAC CE plus its sub-header as a result of logical channel prioritization (LCP); and/or
consistent LBT failure has been triggered and not cancelled in at least one secondary cell, and uplink shared channel (UL-SCH) resources are available for a new transmission in a serving cell for which consistent LBT failure has not been triggered and these UL-SCH resources can accommodate the LBT failure MAC CE plus its sub-header as a result of logical channel prioritization (LCP).
10 . The apparatus according to claim 7 , wherein when consistent LBT failure is cancelled, the second indicating unit indicates the cell information or frequency information of consistent LBT failure to the network device.
11 . The apparatus according to claim 7 , wherein,
when consistent LBT failure is cancelled, the indicated generated information of consistent LBT failure is carried by a second LBT failure MAC CE.
12 . The apparatus according to claim 7 , wherein,
that consistent LBT failure is cancelled is caused by at least one of the following events:
MAC reconfiguration;
upon reception of an indication of BWP switching in a serving cell with triggered consistent LBT failure; or
reconfiguration of consistent LBT failure recovery.
13 . The apparatus according to claim 7 , wherein the first stopping unit stops or suspends the ongoing consistent LBT failure recovery procedure.
14 . The apparatus according to claim 7 , wherein,
the first stopping unit stops the ongoing consistent LBT failure recovery procedure when consistent LBT failure is cancelled.
15 . The apparatus according to claim 14 , wherein that consistent LBT failure is cancelled is caused by at least one of the following events:
MAC reconfiguration;
upon reception of an indication of BWP switching in a serving cell with triggered consistent LBT failure; or
reconfiguration of consistent LBT failure recovery.
16 . The apparatus according to claim 7 , wherein the stopping an ongoing consistent LBT failure recovery procedure comprises at least one of the following behaviors:
stopping ongoing uplink transmission;
clearing a hybrid automatic repeat request (HARQ) buffer of a corresponding HARQ procedure;
stopping a random access procedure being performed on an active BWP in a BWP switching procedure triggered by consistent LBT failure;
stopping an ongoing RRC connection re-establishment procedure after a radio link failure (RLF) of a primary cell group (MCG) triggered by consistent LBT failure;
stopping an ongoing secondary cell group (SCG) failure information procedure after a radio link failure of an SCG triggered by consistent LBT failure; and
stopping ongoing random access procedure initiated by a pending scheduling request (pending SR) failed due to a radio link failure.
17 . An apparatus for consistent LBT failure detection and recovery, applicable to a network device, the apparatus comprising:
a first receiving unit configured to receive first information of consistent LBT failure and/or second information of consistent LBT failure respectively from a terminal equipment; and/or,
a second receiving unit configured to receive cell information or frequency information indicating consistent LBT failure from the terminal equipment.
18 . The apparatus according to claim 17 , wherein,
the first information of consistent LBT failure is carried by a first LBT failure MAC CE,
and the second information of consistent LBT failure is carried by a second LBT failure MAC CE.
19 . The apparatus according to claim 18 , wherein,
the first LBT failure MAC CE is generated instructed by the terminal equipment and transmitted to the network device when consistent LBT failure has been triggered and not cancelled in a serving cell, and/or
the second LBT failure MAC CE is generated instructed by the terminal equipment and transmitted to the network device when consistent LBT failure is cancelled.
20 . The apparatus according to claim 17 , wherein,
cell information or frequency information of consistent LBT failure is carried by a consistent LBT failure MAC CE or another MAC CE or a higher layer message.