Methods for mobility in an integrated terrestrial and non-terrestrial radio access system

An apparatus comprising:

• a processor coupled with a computer-readable medium having stored thereon computer-executable instructions, that when executed, cause the apparatus to:
• receive configuration information to allow hybrid automatic repeat request (HARQ) process sharing across multiple radio link types;
• receive a first downlink control information (DCI) for scheduling a first transmission of a transport block (TB) in a first physical resource on a first radio link associated with a first radio link type, the first DCI comprising a first HARQ process ID;
• receive a second DCI for scheduling a second transmission, wherein the second transmission is a retransmission of at least a portion of the TB in a second physical resource on a second radio link associated with a second radio link type, the second DCI comprising a second HARQ process ID;
• communicate with a first access node, in the first physical resource on the first radio link, the first transmission with the first HARQ process ID;
• and
• communicate with a second access node, in the second physical resource on the second radio link, the second transmission with the second HARQ process ID;
• wherein the first DCI for scheduling the first transmission of the TB comprises an activation or deactivation indication for activating or deactivating HARQ feedback and retransmission over the first radio link or the second radio link;
• wherein the first HARQ process ID and the second HARQ process ID map to a shared HARQ process;
• and
• wherein:
• the first radio link is a non-terrestrial network (NTN) radio link and the first access node is a NTN access node or an integrated access backhaul (IAB) NTN node and the second radio link is a terrestrial network (TN) radio link and the second access node is a TN access node or an IAB TN node;
• or
• the first radio link is a TN radio link and the first access node is a TN access node or an IAB TN node and the second radio link is a NTN radio link and the second access node is a NTN access node or an IAB NTN node.

A non-transitory processor-readable medium storing instructions that when executed by a processor, cause the processor to perform a method including:

• receiving configuration information to allow hybrid automatic repeat request (HARQ) process sharing across multiple radio link types;
• receiving a first downlink control information (DCI) for scheduling a first transmission of a transport block (TB) in a first physical resource on a first radio link associated with a first radio link type, the first DCI comprising a first HARQ process ID;
• receiving a second DCI for scheduling a second transmission, wherein the second transmission is a retransmission of at least a portion of the TB in a second physical resource on a second radio link associated with a second radio link type, the second DCI comprising a second HARQ process ID;
• communicating with a first access node, in the first physical resource on the first radio link, the first transmission with the first HARQ process ID;
• and
• communicating with a second access node, in the second physical resource on the second radio link, the second transmission with the second HARQ process ID;
• wherein the first DCI for scheduling the first transmission of the TB comprises an activation or deactivation indication for activating or deactivating HARQ feedback and retransmission over the first radio link or the second radio link;
• wherein the first HARQ process ID and the second HARQ process ID map to a shared HARQ process;
• and
• wherein:
• the first radio link is a non-terrestrial network (NTN) radio link and the first access node is a NTN access node or an integrated access backhaul (IAB) NTN node and the second radio link is a terrestrial network (TN) radio link and the second access node is a TN access node or an IAB TN node;
• or
• the first radio link is a TN radio link and the first access node is a TN access node or an IAB TN node and the second radio link is a NTN radio link and the second access node is a NTN access node or an IAB NTN node.