Advanced coding on retransmission of data and control
Systems, methods, and instrumentalities are disclosed for advanced coding on retransmission of data and/control information. The systems methods, and instrumentalities may include one or more of the following: chase combining for retransmission; incremental redundancy (IR) hybrid automatic repeat request (IR-HARQ); or incremental freezing (IF) HARQ. IF-HARQ may use lower coding rates and/or increased mother codeword length. IF-HARQ for retransmission with joint encoding and transmission of failed data and/or control message(s) (e.g., new control message(s)) may be used. This may include one or more of the following: increased priority for retransmission data and mapping retransmitted data to more reliable bit channels; or allocating more PC frozen bits for retransmitted data. A HARQ decision may be provided. For example, a decision may be made between the use of chase combining (CC) HARQ, IR-HARQ, or IF-HARQ. For IF-HARQ, additional decisions may be made.
1. A device comprising:
a processor configured to:
receive a hybrid automatic repeat request negative acknowledgement (HARQ-NACK) information associated with a transmission, wherein the transmission comprises a first control information and data;
determine that the received HARQ-NACK information uses an incremental freezing HARQ (IF-HARQ) retransmission scheme;
determine whether a retransmission associated with the transmission comprises a retransmission of the data without the first control information or a retransmission of the data and a transmission of a second control information; and
send a retransmission using the IF-HARQ retransmission scheme, wherein:
on a condition that the retransmission is the retransmission of the data without the first control information, the retransmission comprises polar encoded data, wherein the data is polar encoded using a first mother code length that is greater than a second mother code length used for the transmission, and
on a condition that the retransmission is the retransmission of the data and the transmission of the second control information, the retransmission comprises polar encoded data and polar encoded second control information, wherein the polar encoded data is mapped to a first bit channel and the polar encoded second control information is mapped to a second bit channel, and wherein the first bit channel has a reliability that is greater than the second bit channel.
2. The device of claim 1 , wherein the device comprises either a wireless transmit/receive unit or a node B.
3. The device of claim 1 , wherein the processor is further configured to receive an acknowledgement (ACK) or a negative acknowledgement (NACK) for the first retransmission that indicates whether a second retransmission should be sent.
4. The device of claim 1 , wherein being configured to send retransmission comprising the polar encoded data or the polar encoded data and the polar encoded second control information comprises being configured to perform code block segmentation, bit channel mapping, rate matching, multiplexing, and code block concatenation.
5. The device of claim 1 , wherein the polar encoded data mapped to the first bit channel comprises the data polar encoded mapped to a most reliable input bit sub-channel.
6. The device of claim 1 , wherein the processor being configured to send the retransmission comprises being configured to use a reduced coding rate relative to a coding rate used for the transmission.
7. The device of claim 1 , wherein the processor being configured to determine that the received HARQ-NACK information uses IF-HARQ retransmission scheme is based on at least one of a device capability, a data quality of service (QoS), or at least one available resource for retransmission.
8. A retransmission method comprising: +
receiving a hybrid automatic repeat request negative acknowledgement (HARQ-NACK) information associated with a transmission, wherein the transmission comprises a first control information and data;
determining that the received HARQ-NACK information uses an incremental freezing HARQ (IF-HARQ) retransmission scheme;
determining whether a retransmission associated with the transmission comprises a retransmission of the data without the first control information or a retransmission of the data and a transmission of a second control information; and
sending a retransmission using the IF-HARQ retransmission scheme, wherein:
on a condition that the retransmission is the retransmission of the data without the first control information, the retransmission comprises polar encoded the data using a first mother code length that is greater than a second mother code length used for the transmission, and
on a condition that the retransmission is the retransmission of the data and the transmission of the second control information, the retransmission comprises polar encoded data and polar encoded second control information, wherein the polar encoded data is mapped to a first bit channel and the polar encoded second control information is mapped to a second bit channel, and wherein the first bit channel has a reliability that is greater than the second bit channel.
9. The method of claim 8 , further comprising receiving an acknowledgement (ACK) or a negative acknowledgement (NACK) for the first retransmission that indicates whether an additional retransmission should be sent.
10. The method of claim 8 , wherein sending retransmission comprising the polar encoded data or the polar encoded data and the polar encoded second control information comprises performing code block segmentation, bit channel mapping, rate matching, multiplexing, and code block concatenation.
11. The method of claim 8 , wherein the polar encoded data mapped to the first bit channel comprises the polar encoded data mapped to a most reliable input bit sub-channel.
12. The method of claim 8 , wherein sending the retransmission comprises using a reduced coding rate relative to a coding rate used for the transmission.
13. The method of claim 8 , wherein determining that the received HARQ-NACK information uses IF-HARQ retransmission scheme is based on at least one of a device capability, a data quality of service (QoS), or at least one available resource for retransmission.
14. The device of claim 1 , wherein the processor is further configured to apply parity check frozen bits to the retransmission.
15. The device of claim 1 , wherein on condition that the retransmission is the retransmission of the data without the first control information, the processor is configured to apply the IF-HARQ retransmission scheme to the data of the transmission.
16. The method of claim 8 , further comprising applying parity check frozen bits to the retransmission.
17. The method of claim 8 , wherein on condition that the retransmission is the retransmission of the data without the first control information, applying the IF-HARQ retransmission scheme to the data of the transmission.
18. The device of claim 1 , wherein the data is an ultra-reliable low latency communication (URLLC) data and second control information comprises a new control message.
19. The method of claim 8 , wherein the data is an ultra-reliable low latency communication (URLLC) data and second control information comprises a new control message.