Abstract: A polar code construction method and an apparatus. A communication apparatus obtains a reliability weight sequence, and determines a first threshold that indicates a weight of lowest reliability of a subchannel corresponding to an information bit. The communication apparatus determines a non-pre-frozen subchannel corresponding to a content value greater than or equal to the first threshold in the reliability weight sequence as the subchannel corresponding to the information bit based on the first threshold, and performs polar coding on the information bit based on the subchannel corresponding to the information bit.

Abstract: A resource mapping method and apparatus are described that reduce resource mapping complexity. The method includes an access network device obtaining resource mapping information of at least one terminal, and sending the resource mapping information to the at least one terminal respectively. The resource mapping information indicates a resource element RE to which each of the at least one terminal performs mapping in each RMB in a first resource mapping block RMB set. An RE to which a first terminal performs mapping in each RMB in the first RMB set is determined based on a first interleaved sequence, and the first interleaved sequence is determined based on a base sequence. The first terminal is any one of the at least one terminal, and the first RMB set includes at least one RMB.

Abstract: The disclosure belongs to the field of tunnel construction technologies, and more particularly, relates to a construction method for making a water-rich sand layer shield over cross an existing line and underneath cross a sewage push pipe at a close range. The method specifically includes the following steps of: S1) before construction, using MIDAS GTS NX software and FLAC3D to optimize a tunneling scheme antecedently by numerical simulation to determine a part of unfavourable stress; S2) tunneling a test section, the test section being a stratum crossing a front shield direction by 45 m to 60 m; and S3) performing shield crossing construction, wherein a shield crossing construction process includes the steps of: 1) controlling a soil pressure; 2) controlling a shield thrust; 3) performing synchronous grouting; 4) performing a ballasting measure in a tunnel; and 5) performing automatic monitoring in the tunnel.