Advanced polar codes for control channel

A polar decoding method implemented by a wireless transmit receive unit (WTRU) comprising:

• receiving first polar encoded bits comprising an encoded first downlink control information (DCI);
• decoding the first polar encoded bits comprising the encoded first DCI to obtain a decoded first DCI;
• receiving second polar encoded bits comprising a second DCI and the first DCI, wherein the first DCI is part of a frozen set, wherein the frozen set is associated with the second DCI, wherein a first subset of the second polar encoded bits comprising the second DCI is received in a first plurality of bit channels and a second subset of the second polar encoded bits comprising the first DCI is received in a second plurality of bit channels, and wherein reliability of the first plurality of bit channels is higher than reliability of the second plurality of bit channels;
• and
• attempting to decode the second polar encoded bits using the decoded first DCI to obtain a decoded second DCI.