Method and apparatus for L2 SL-based UE-to-network relay operations in wireless communication network

A first user equipment (UE) in a wireless communication system, the first UE comprising:

• a processor;
• and
• a transceiver operably coupled to the processor, the transceiver configured to:
• receive, from a second UE via a sidelink channel, a message including a list for at least one requested system information block (SIB) for the second UE,
• receive, from a base station, a short message via physical downlink control channel (PDCCH),
• acquire, from the base station, one or more SIBs of the at least one requested SIB based on the short message and the list for the at least one requested SIB in the message, the one or more SIBs including at least one of:
• (i) at least one first SIB related to an earthquake and tsunami warning system/commercial mobile alert service (ETWS/CMAS) and (ii) at least one second SIB other than the at least one first SIB related to the ETWS/CMAS, and
• transmit, to the second UE via the sidelink channel, the one or more SIBs.

A wireless communication system comprising:

• a first UE;
• and
• a second UE,
• wherein the first UE is configured to:
• receive, from the second UE via a sidelink channel, a message including a list for at least one requested system information block (SIB) for the second UE,
• receive, from a base station, a short message via physical downlink control channel (PDCCH),
• acquire, from the base station, one or more SIBs of the at least one requested SIB based on the short message and the list for the at least one requested SIB in the message, and
• transmit, to the second UE via the sidelink channel, the one or more SIBs,
• wherein the second UE is configured to:
• transmit, to the first UE via the sidelink channel, the message including the list for the at least one requested SIB for the second UE;
• and
• receive, from the first UE via the sidelink channel, the one or more SIBs of the at least one requested SIB,
• wherein the one or more SIBs includes at least one of (i) at least one first SIB related to an earthquake and tsunami warning system/commercial mobile alert service (ETWS/CMAS) and (ii) at least one second SIB other than the at least one first SIB related to the ETWS/CMAS.