Methods and apparatuses of selecting a carrier for a sidelink multi-carrier operation

A base station 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 base station to:
• receive, from a first user equipment (UE), at least one of carrier quality information and carrier problem information of a sidelink (SL) between the first UE and a second UE, in response to the base station scheduling a carrier for a data transmission on the SL;
• and
• transmit, to the first UE, indicating information regarding a carrier selected by the base station for the data transmission on the SL.

A method performed by a first user equipment (UE), the method comprising:

• transmitting, to a network node, at least one of carrier quality information and carrier problem information of a sidelink (SL) between the first UE and a second UE, in response to data to be transmitted on the SL or data already transmitted on one or more carriers of the SL and in response to the network node scheduling a carrier for a data transmission on the SL;
• or
• in response to the first UE scheduling the carrier for the data transmission on the SL:
• determining whether the at least one of the carrier quality information and the carrier problem information of the SL fulfills a carrier selection or reselection condition;
• and
• selecting a carrier from multiple carriers configured on the SL, in response to the at least one of the carrier quality information and the carrier problem information of the SL fulfilling the carrier selection or reselection condition.

A processor for wireless communication, comprising:

• at least one controller coupled with at least one memory and configured to cause the processor to:
• transmit, to a network node, at least one of carrier quality information and carrier problem information of a sidelink (SL) between a first user equipment (UE) that includes the processor and a second UE, in response to data to be transmitted on the SL or data already transmitted on one or more carriers of the SL and in response to the network node scheduling a carrier for a data transmission on the SL;
• or
• determine whether the at least one of the carrier quality information and the carrier problem information of the SL fulfills a carrier selection or reselection condition, in response to the at least one processor scheduling the carrier for the data transmission on the SL;
• and
• select a carrier from multiple carriers configured on the SL, in response to the at least one of the carrier quality information and the carrier problem information of the SL fulfilling the carrier selection or reselection condition.