Methods and procedures for polar encoding and decoding with low latency
A polar code may be initially divided into multiple polar component codes where the features of these component codes, such as the number of component codes and the size of the component codes, are determined based on parameters such as the number of available timing units within a transmission interval, interleaving depth, and decoder capability. For each selected component code, the order of code bit generation and their indexes may be determined. The determined indexes may be assigned into different, unique groups according to the order of code bit generation. An interleaving operation may be configured and then executed according to the determined index grouping. In the transmission phase, the code bits may be transmitted based on the identified order of the bit generation in the component polar codes, such as the determined index grouping.
1. A method comprising:
decomposing a polar code into a plurality of component codes;
transmitting a packet to a receiver,
wherein the packet includes an interleaved group of code bits,
wherein the code bits were generated by grouping a code bit of a first component code with a code bit of a second component code based on a timing order of code bit generations of each component code, and
wherein the first component code and the second component code are part of the plurality of component codes decomposed from the polar code.
2. The method of claim 1 , wherein the interleaved group is modulated.
3. The method of claim 1 , wherein a total count of the plurality of component codes is based on one or more of a number of available timing units within a transmission interval, an interleaving depth, or a decoder capability.
4. The method of claim 1 , wherein a length of each of the plurality of component codes is based on one or more of a number of available timing units within a transmission interval, an interleaving depth, or a decoder capability.
5. The method of claim 1 , further comprising determining an order of code bits and index for each component code.
6. The method of claim 1 , further comprising:
receiving capability information of the receiver;
determining time interval information based on the capability information of the receiver; and
sending control information to the receiver prior to transmitting the packet, wherein the control information includes time interval information.
7. The method of claim 1 , wherein the method is performed by a wireless transmit receive unit (WTRU).
8. The method of claim 1 , wherein the method is performed by a base station.
9. A device comprising:
a processor operatively coupled to a transceiver, the processor configured to:
decompose a polar code into a plurality of component codes; and
the transceiver configured to:
transmit a packet to a receiver,
wherein the packet includes an interleaved group of code bits,
wherein the code bits were generated by grouping a code bit of a first component code with a code bit of a second component code based on a timing order of code bit generations of each component code, and
wherein the first component code and the second component code are part of the plurality of component codes decomposed from the polar code.
10. The device of claim 9 , wherein the interleaved group is outputted to a modulator.
11. The device of claim 9 , wherein a total count of the plurality of component codes is based on one or more of a number of available timing units within a transmission interval, an interleaving depth, or a decoder capability.
12. The device of claim 9 , wherein a length of each of the plurality of component codes is based on one or more of a number of available timing units within a transmission interval, an interleaving depth, or a decoder capability.
13. The device of claim 9 , the processor further configured to determine an order of code bits and index for each component code.
14. The device of claim 9 , the processor and transceiver further configured to:
receive capability information of the receiver;
determine time interval information based on the capability information of the receiver; and
send control information to the receiver prior to transmitting the packet, wherein the control information includes time interval information.
15. The device of claim 9 , wherein the method is performed by a wireless transmit receive unit (WTRU).
16. The device of claim 9 , wherein the method is performed by a base station.