Code block aware slot preemption
According to certain embodiments a method is provided for use in a wireless transmitter that includes receiving an indication to schedule a high-priority transmission to preempt a lower-priority transmission that comprises one or more code blocks. A first resource allocation is determined for the high-priority transmission. A fraction of bits in the one or more code blocks of the lower-priority transmission that will be punctured by the first resource allocation is determined. When the fraction of bits in the one or more code blocks of the lower-priority transmission that will be punctured is less than a threshold, the first resource allocation is used for the high-priority transmission. Otherwise, a second allocation for the high-priority transmission is determined and used to minimize a number of the one or more code blocks that will be punctured.
1. A method for use in a wireless transmitter, the method comprising:
receiving an indication to schedule a high-priority transmission to preempt a lower-priority transmission, the lower-priority transmission comprising one or more code blocks;
determining a first resource allocation for the high-priority transmission;
determining a fraction of bits in the one or more code blocks of the lower-priority transmission that will be punctured by the first resource allocation;
when the fraction of bits in the one or more code blocks of the lower-priority transmission that will be punctured is less than a threshold, using the first resource allocation for the high-priority transmission; and
when the fraction of bits in the one or more code blocks of the lower-priority transmission that will be punctured is not less than the threshold, determining a second allocation for the high-priority transmission that minimizes a number of the one or more code blocks that will be punctured and using the second allocation for high-priority transmission.
2. The method of claim 1 , wherein the wireless transmitter comprises a network node.
3. The method of claim 1 , wherein the wireless transmitter comprises a user equipment.
4. A wireless transmitter comprising:
processing circuitry configured to:
receive an indication to schedule a high-priority transmission to preempt a lower-priority transmission, the lower-priority transmission comprising one or more code blocks;
determine a first resource allocation for the high-priority transmission;
determine a fraction of bits in the one or more code blocks of the lower-priority transmission that will be punctured by the high-priority resource allocation;
when the fraction of bits in the one or more code blocks of the lower-priority transmission that will be punctured is less than a threshold, use the first resource allocation for the high-priority transmission; and
when the fraction of bits in the one or more code blocks of the lower-priority transmission that will be punctured is not less than the threshold, determine a second allocation for the high-priority transmission that minimizes a number of the one or more code blocks that will be punctured and using the second allocation for high-priority transmission.
5. The wireless transmitter of claim 4 , wherein:
the lower-priority transmission comprises a plurality of code blocks, and
the first resource allocation for the high-priority transmission is spread over at least two code blocks within the plurality of code blocks of the lower-priority transmission.
6. The wireless transmitter of claim 5 , wherein the at least two code blocks over which the first resource allocation is spread are within one code block group.
7. The wireless transmitter of claim 5 wherein the first resource allocation is spread evenly over the plurality of code blocks of the lower-priority transmission.
8. The wireless transmitter of claim 4 , wherein determining the first resource allocation for the high-priority transmission comprises determining the first resource allocation that spreads puncturing over all of the code blocks within one code block group.
9. The wireless transmitter of claim 4 , wherein the processing circuitry is configured to select the lower-priority transmission from a plurality of transmissions, the lower-priority transmission being a lowest priority signal of the plurality of transmissions.
10. The wireless transmitter of claim 4 , wherein the threshold is dependent on least one capability of a lower-priority receiver, the at least one capability comprising one or more of:
an ability to receive a pre-emption indication,
an ability to blindly detect pre-emption, and
an ability to set pre-empted bits LLR to zero.
11. The wireless transmitter of claim 4 wherein the threshold is zero to minimize the number of the one or more code block of the lower-priority transmission that will be punctured.
12. The wireless transmitter of claim 4 , wherein the high-priority transmission also preempts an additional lower-priority transmission, the additional lower-priority transmission comprising one or more code blocks, and the processing circuitry is further configured to:
determine a fraction of bits in the one or more code blocks of the additional lower-priority transmission that will be punctured by the first resource allocation;
use the first resource allocation for the high-priority transmission when:
the fraction of bits in the one or more code blocks of the lower-priority transmission that will be punctured is less than the threshold, and
the fraction of bits in the one or more code blocks of the additional lower-priority transmission that will be punctured is less than the threshold; and
use the second resource allocation for the high-priority transmission when:
the fraction of bits in the one or more code blocks of the lower-priority transmission that will be punctured is not less than the threshold, or
the fraction of bits in the one or more code blocks of the additional lower-priority transmission that will be punctured is not less than the threshold.
13. The wireless transmitter of claim 12 , wherein:
the lower-priority transmission comprises a first plurality of code blocks,
the additional lower-priority transmission comprises second plurality of code blocks, and
the first resource allocation for the high-priority transmission is spread over at least two code blocks within the first plurality of code blocks of the lower-priority transmission and the second plurality of code blocks of the additional lower-priority transmission.
14. The wireless transmitter of claim 12 , wherein the lower-priority transmission is associated with a first MIMO layer and the additional lower-priority transmission is associated with a second MIMO layer.
15. The wireless transmitter of claim 4 , wherein the processing circuitry is configured to replace at least one resource element of the lower-priority transmission with at least one resource element associated with the high-priority transmission.
16. The wireless transmitter of claim 15 , wherein:
the lower-priority transmission and the high-priority transmission are scheduled for transmission from the wireless transmitter to a single wireless receiver, and
replacing the at least one resource element of the lower-priority transmission comprises replacing a code block or code block group of the lower-priority transmission with a code block or code block group of the high-priority transmission.
17. The wireless transmitter of claim 16 , wherein the replaced at least one resource element of the lower-priority transmission comprises a plurality of resource elements in a plurality of orthogonal frequency division multiplexing symbols.
18. The wireless transmitter of claim 16 , wherein the replaced at least one resource element of the lower-priority transmission comprises a plurality of resource elements within a time-frequency region.
19. The wireless transmitter of claim 4 , wherein determining the first resource allocation for the high-priority transmission comprises:
selecting the first resource allocation from a plurality of possible resource allocations based on a determination that
the fraction of bits in the one or more code blocks of the lower-priority transmission that will be punctured is less than the threshold for the first resource allocation.
20. The wireless transmitter of claim 19 , wherein:
the plurality of possible resource allocations comprises at least one of:
a first possible resource allocation for the high-priority transmission starting from a minimal subcarrier number of a plurality of subcarriers of the lower-priority transmission; and
a second possible resource allocation for the high-priority transmission including a subcarrier with a maximal subcarrier number of a plurality of subcarriers of the lower-priority transmission on a value of a high-priority allocation band size.
21. The wireless transmitter of claim 4 , wherein determining the second resource allocation for the high-priority transmission comprises:
selecting the second resource allocation from a plurality of possible resource allocations based on a determination that the fraction of bits in the one or more code blocks of the lower-priority transmission that will be punctured is not less than a threshold for the first resource allocation.
22. The wireless transmitter of claim 21 , wherein the plurality of possible resource allocations comprises at least one of:
a first possible resource allocation for the high-priority transmission that replaces at least one resource element of the lower-priority transmission with at least one resource element of the high-priority transmission starting from a minimal subcarrier number of a plurality of subcarriers of the lower-priority transmission; and
a second possible resource allocation for the high-priority transmission that replaces at least one resource element of the lower-priority transmission with at least one resource element of the high-priority transmission including a subcarrier with a maximal subcarrier number of a plurality of subcarriers on a value of a high-priority allocation band size.
23. The wireless transmitter of claim 4 , wherein the wireless transmitter comprises a network node.
24. The wireless transmitter of claim 4 , wherein the wireless transmitter comprises a user equipment.