Code Block Groups for Retransmissions in a Wireless Communication System

A transmit radio node configured for use in a wireless communication system, the transmit radio node comprising radio circuitry and processing circuitry wherein the transmit radio node is configured to:

• transmit one or more code blocks, CBs, of a transport block to a receive radio node;
• receive feedback from the receive radio node that positively or negatively acknowledges each of one or more first code block groups, CBGs, into which the one or more transmitted CBs are allocated according to a first CB-to-CBG allocation;
• re-transmit to the receive radio node any CBs that the first CB-to-CBG allocation allocates to one or more first CBGs which the feedback negatively acknowledged;
• and
• receive feedback from the receive radio node that positively or negatively acknowledges each of one or more second CBGs into which the re-transmitted CBs are allocated according to a second CB-to-CBG allocation, wherein the first and second CB-to-CBG allocations are different.

A receive radio node configured for use in a wireless communication system, the receive radio node comprising radio circuitry and processing circuitry wherein the receive radio node is configured to:

• receive one or more code blocks, CBs, of a transport block from a transmit radio node;
• transmit feedback to the transmit radio node that positively or negatively acknowledges each of one or more first code block groups, CBGs, into which the one or more transmitted CBs are allocated according to a first CB-to-CBG allocation;
• receive from the transmit radio node re-transmission of any CBs that the first CB-to-CBG allocation allocates to one or more first CBGs which the feedback negatively acknowledged;
• and
• transmit feedback to the transmit radio node that positively or negatively acknowledges each of one or more second CBGs into which the re-transmitted CBs are allocated according to a second CB-to-CBG allocation, wherein the first and second CB-to-CBG allocations are different.

A method performed by a transmit radio node configured for use in a wireless communication system, the method comprising:

• transmitting one or more code blocks, CBs, of a transport block to a receive radio node;
• receiving feedback from the receive radio node that positively or negatively acknowledges each of one or more first code block groups, CBGs, into which the one or more transmitted CBs are allocated according to a first CB-to-CBG allocation;
• re-transmitting to the receive radio node any CBs that the first CB-to-CBG allocation allocates to one or more first CBGs which the feedback negatively acknowledged;
• and
• receiving feedback from the receive radio node that positively or negatively acknowledges each of one or more second CBGs into which the re-transmitted CBs are allocated according to a second CB-to-CBG allocation, wherein the first and second CB-to-CBG allocations are different.

A method performed by a receive radio node configured for use in a wireless communication system, the method comprising:

• receiving one or more code blocks, CBs, of a transport block from a transmit radio node;
• transmitting feedback to the transmit radio node that positively or negatively acknowledges each of one or more first code block groups, CBGs, into which the one or more transmitted CBs are allocated according to a first CB-to-CBG allocation;
• receiving from the transmit radio node re-transmission of any CBs that the first CB-to-CBG allocation allocates to one or more first CBGs which the feedback negatively acknowledged;
• and
• transmitting feedback to the transmit radio node that positively or negatively acknowledges each of one or more second CBGs into which the re-transmitted CBs are allocated according to a second CB-to-CBG allocation, wherein the first and second CB-to-CBG allocations are different.