Methods, apparatuses, and media for indicating listen before talk failure
Embodiments of the present disclosure relate to methods, apparatuses, and media for indicating Listen Before Talk (LBT) failure. A method performed by a terminal device comprises determining whether at least one consistent Listen Before Talk, LBT, failure is triggered on a set of resources associated with a data transmission between a network device and the terminal device in Radio Resource Control (RRC) non-connected state; in accordance with a determination that at least one consistent LBT failure is triggered, generating an indication of the at least one consistent LBT failure for the data transmission in the RRC non-connected state; and transmitting the indication to the network device. In this way, the format and signaling of consistent LBT failure indication for data transmission in the RRC non-connected state is designed and the transmission of the indication can be performed in various state of the terminal device. Meanwhile, the scheme of the cancellation mechanisms for the triggered consistent LBT failure for SDT is also proposed.
1 . A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
determine whether at least one consistent Listen Before Talk (LBT) failure is triggered on a set of resources associated with a data transmission between a network device and the UE in a Radio Resource Control (RRC) non-connected state;
when at least one consistent LBT failure is triggered, generate an indication of the at least one consistent LBT failure for the data transmission in the RRC non-connected state; and
transmit, in the RRC non-connected state, the indication to the network device.
2 . The UE of claim 1 , wherein, to generate the indication, the at least one processor is configured to cause the UE to:
determine, from the set of resources, a subset of resources on which the at least one consistent LBT failure is triggered; and
generate the indication indicating the subset of resources.
3 . The UE of claim 2 , wherein, to determine the subset of resources, the at least one processor is configured to cause the UE to determine:
at least one pre-configured resource for the data transmission in the RRC non-connected state,
at least one Random Access Channel (RACH) occasion for the data transmission in the RRC non-connected state, and
an uplink channel for transmitting a message in a RACH procedure for the data transmission in the RRC non-connected state.
4 . The UE of claim 1 , wherein, to generate the indication, the at least one processor is configured to cause the UE to:
generate a signaling indicating that the at least one consistent LBT failure is triggered on the set of resources.
5 . The UE of claim 1 , wherein, to transmit the indication, the at least one processor is configured to cause the UE to:
transmit the indication after the data transmission is initiated in an RRC_INACTIVE or RRC_IDLE state.
6 . The UE of claim 1 , wherein, to transmit the indication, the at least one processor is configured to cause the UE to:
transmit the indication after a Random Access Channel (RACH) procedure for the data transmission is initiated in an RRC_INACTIVE or RRC_IDLE state.
7 . The UE of claim 1 , wherein, to transmit the indication, the at least one processor is configured to cause the UE to:
transmit the indication after an uplink transmission is initiated in an RRC_CONNECTED state.
8 . The UE of claim 1 , wherein, to transmit the indication, the at least one processor is configured to cause the UE to:
transmit the indication via an RRC message.
9 . The UE of claim 1 , wherein, to transmit the indication, the at least one processor is configured to cause the UE to:
transmit the indication together with data to be transmitted in an RRC_INACTIVE or an RRC_IDLE state.
10 . The UE of claim 1 , wherein the at least one processor is further configured to cause the UE to:
cancel the at least one consistent LBT failure after the indication has been transmitted.
11 . The UE of claim 1 , wherein the at least one consistent LBT failure comprises a plurality of consistent LBT failures, and wherein the at least one processor is further configured to cause the UE to:
cancel a portion of consistent LBT failures in the plurality of consistent LBT failures after the indication has been transmitted, wherein the portion of consistent LBT failures is triggered on the set of resources associated with the data transmission in the RRC non-connected state.
12 . The UE of claim 1 , wherein the at least one consistent LBT failure comprises a plurality of consistent LBT failures, and wherein the at least one processor is further configured to cause the UE to:
cancel a portion of consistent LBT failures in the plurality of consistent LBT failures after the indication has been transmitted, wherein the portion of consistent LBT failures is triggered on a further set of resources used for transmitting the indication.
13 . The UE of claim 1 , wherein the at least one consistent LBT failure comprises a plurality of consistent LBT failures, and wherein the at least one processor is further configured to cause the UE to:
cancel a portion of consistent LBT failures in the plurality of consistent LBT failures after the indication has been transmitted on a further set of resources used for transmitting the indication, wherein the portion of consistent LBT failures is triggered on resources different from the further set of resources.
14 . A processor for wireless communication, comprising:
at least one memory; and
a controller coupled with the at least one memory and configured to cause the controller to:
determine whether at least one consistent Listen Before Talk (LBT) failure is triggered on a set of resources associated with a data transmission between a network device and the UE in Radio Resource Control (RRC) non-connected state;
when at least one consistent LBT failure is triggered, generate an indication of the at least one consistent LBT failure for the data transmission in the RRC non-connected state; and
transmit, in the RRC non-connected state, the indication to the network device.
15 . The processor of claim 14 , wherein, to generate the indication, the at least one processor is configured to cause the UE to:
determine, from the set of resources, a subset of resources on which the at least one consistent LBT failure is triggered; and
generate the indication indicating the subset of resources.
16 . A method performed by a user equipment (UE), the method comprising:
determining whether at least one consistent Listen Before Talk (LBT) failure is triggered on a set of resources associated with a data transmission between a network device and the UE in Radio Resource Control (RRC) non-connected state;
at least one consistent LBT failure is triggered, generate an indication of the at least one consistent LBT failure for the data transmission in the RRC non-connected state; and
transmitting, in the RRC non-connected state, the indication to the network device.
17 . The method of claim 16 , wherein generating the indication comprises:
determining, from the set of resources, a subset of resources on which the at least one consistent LBT failure is triggered; and
generating the indication indicating the subset of resources.
18 . A network device for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the network device to:
receive, from a user equipment (UE) in a Radio Resource Control (RRC) non-connected state, an indication of at least one consistent Listen Before Talk (LBT) failure for a data transmission between the UE and the network device; and
determine, based on the indication, resources to be allocated to the UE for a further data transmission in the RRC non-connected state between the UE and the network device.