Method and devices for transmitting system information from terminal device

A method, wherein the method comprises:

• generating, by a second terminal device, first indication information that indicates system information (SI) required by the second terminal device, wherein the first indication information comprises information indicating one or more capabilities supported by the second terminal device, the one or more capabilities including an extended access barring (EAB) capability, a commercial mobile alert service (CMAS) capability, a service specific access control (SSAC) capability, or an application specific congestion control for data communication (ACDC) capability supported by the second terminal device;
• sending, by the second terminal device, the first indication information to a first terminal device for the first terminal device to determine all of the SI required by the second terminal device, wherein the second terminal device communicates with a base station via the first terminal device;
• and
• receiving, by the second terminal device from the first terminal device, a message that comprises target SI, wherein the target SI is some or all of the SI required by the second terminal device.

A terminal device comprising:

• a transceiver;
• a non-transitory memory storage comprising instructions;
• and
• a processor in communication with the non-transitory memory storage, wherein the processor is configured to execute the instructions to:
• receive first indication information from a second terminal device, wherein the first indication information comprises information indicating one or more capabilities supported by the second terminal device, one or more capabilities including an extended access barring (EAB) capability, a commercial mobile alert service (CMAS) capability, a service specific access control (SSAC) capability, or an application specific congestion control for data communication (ACDC) capability supported by the second terminal device;
• determine all of system information (SI) required by second terminal device based on the first indication information including the one or more capabilities supported by the second terminal device, wherein the second terminal device communicates with a base station via the terminal device;
• and
• send a message comprising target SI to the second terminal device, wherein the target SI is at least some or all of the SI required by the second terminal device.

A terminal device, wherein the terminal device comprises:

• a transceiver;
• a non-transitory memory storage comprising instructions;
• and
• a processor in communication with the non-transitory memory storage, wherein the processor is configured to execute the instructions to:
• generate first indication information that indicates system information (SI) required by the terminal device, wherein the first indication information comprises information indicating one or more capabilities supported by the terminal device, the one or more capabilities including an extended access barring (EAB) capability, a commercial mobile alert service (CMAS) capability, a service specific access control (SSAC) capability, or an application specific congestion control for data communication (ACDC) capability supported by the terminal device;
• send the first indication information to a first terminal device for the first terminal device to determine all of the SI required by the terminal device, wherein the terminal device is configured to communicate with a base station via the first terminal device;
• and
• receive a message that comprises target SI from the first terminal device, wherein the target SI is some or all of the SI required by the terminal device.