Method of supporting industrial internet of things (iiot) with configured uplink grants on a shared spectrum

A method for communicating in an unlicensed spectrum by a user equipment (UE), the method comprising:

• receiving, by the UE from a base station, a first configured uplink grant configuration for transmitting data in an unlicensed spectrum and a second configured uplink grant configuration for transmitting data in the unlicensed spectrum;
• generating, by the UE, a data packet for the first configured uplink grant configuration using a first hybrid automatic repeat request (HARQ), transmission scheme;
• performing, by the UE for the first configured uplink grant configuration, a first listen-before-talk (LBT), procedure;
• and
• in response to determining that the first LBT procedure has failed:
• identifying, by the UE, an opportunity to transmit the data packet using the second configured uplink grant configuration;
• performing, by the UE for the second configured uplink grant configuration, a second LBT procedure;
• and
• in response to determining that the second LBT procedure has been successful, transmitting, by the UE to the base station, the data packet using a second HARQ transmission scheme different from the first HARQ transmission scheme via the opportunity in a HARQ retransmission.

A user device comprising processing hardware configured to:

• receive, by the user device from a base station, a first configured uplink grant configuration for transmitting data in an unlicensed spectrum and a second configured uplink grant configuration for transmitting data in the unlicensed spectrum;
• generate, by the user device, a data packet for the first configured uplink grant configuration using a first hybrid automatic repeat request (HARQ), transmission scheme;
• perform, by the user device for the first configured uplink grant configuration, a first listen-before-talk (LBT), procedure;
• and
• in response to the user device determining that the first LBT procedure has failed:
• identify, by the user device, an opportunity to transmit the data packet using the second configured uplink grant configuration;
• perform, by the user device for the second configured uplink grant configuration, a second LBT procedure;
• and
• in response to determining that the second LBT procedure has been successful, transmitting, by the user device to the base station, the data packet using a second HARQ transmission scheme different from the first HARQ transmission scheme via the opportunity in a HARQ retransmission.