Techniques are disclosed relating to downlink control information for wireless communications. In some embodiments, the downlink control information includes code block group information that indicates which code block groups are transmitted and soft buffer handling information that indicates whether to flush previously-determined soft bits that correspond to one or more code block groups.

A low density parity check (LDPC) encoder, an LDPC decoder, and an LDPC encoding method are disclosed. The LDPC encoder includes first memory, second memory, and a processor. The first memory stores an LDPC codeword having a length of 16200 and a code rate of 3/15. The second memory is initialized to 0. The processor generates the LDPC codeword corresponding to information bits by performing accumulation with respect to the second memory using a sequence corresponding to a parity check matrix (PCM).

A packet processing method includes generating, by a processor of a network device, a first encoding task based on M original packets in a to-be-processed first data stream, where M is a positive integer, and where the first encoding task instructs to encode the M original packets; and performing, by a target hardware engine of the network device and based on the first encoding task, forward error correction (FEC) encoding on the M original packets to obtain R redundant packets, where R is a positive integer.

Instructions stored on a computer-readable medium include, in response to receiving a new message for transmission, generating a candidate message by attempting recovery of a previous message from the new message and recovery bits of the previous message. The instructions include, in response to an indicator indicating that the attempted recovery was successful, computing a delta between the new message and the candidate message and generating a delivery message based on the computed delta. The instructions include, in response to the indicator indicating that the attempted recovery was unsuccessful, generating the delivery message based on the new message exclusive of the computed delta. The instructions include calculating new recovery bits from the new message. The instructions include storing the new recovery bits as the recovery bits of the previous message. The instructions include transmitting the delivery message to a destination over a communications channel.

A system and method for selecting a number of cyclic redundancy check bits in a communication system. In one embodiment, an apparatus operating in a communication system is configured to receive scheduling information from the communication system, and determine an information block length (K) and/or code rate (R) for a code block including a sequence of data bits from the scheduling information. The apparatus is further configured to determine a number of cyclic redundancy check (CRC) bits as a function of the information block length (K) and/or code rate (R) for the code block.

Disclosed in an embodiment of the present invention are a polar code encoding method and device, the method comprising: utilizing a common information bit set to represent each of m polar code blocks, the polar codes in each polar code block having the same code length and different code rates, and m being greater than or equal to 2; according to the common information bit set corresponding to the polar code block, acquiring an information bit set corresponding to each polar code in the polar code block; and according to the information bit set corresponding to each polar code in the polar code block, conducting polar code encoding on information to be encoded, thus reducing polar code representation overhead, and solving the problem in the prior art of excessively high polar code representation overhead.

A system for software error-correcting code (ECC) protection or compression of original data using ECC data in a first memory is provided. The system includes a processing core for executing computer instructions and accessing data from a main memory, and a non-volatile storage medium for storing the computer instructions. The software ECC protection or compression includes: a data matrix for holding the original data in the first memory; a check matrix for holding the ECC data in the first memory; an encoding matrix for holding first factors in the main memory, the first factors being for encoding the original data into the ECC data; and a thread for executing on the processing core. The thread includes a Galois Field multiplier for multiplying entries of the data matrix by an entry of the encoding matrix, and a sequencer for ordering operations using the Galois Field multiplier to generate the ECC data.

Embodiment techniques map parity bits to sub-channels based on their row weights. In one example, an embodiment technique includes polar encoding, with an encoder of the device, information bits and at least one parity bit using the polar code to obtain encoded data, and transmitting the encoded data to another device. The polar code comprises a plurality of sub-channels. The at least one parity bit being placed in at least one of the plurality of sub-channels. The at least one sub-channel is selected from the plurality of sub-channels based on a weight parameter.

Embodiments of this application provide a communication method, a terminal device, and a network device. Referring to the method, blind detection of a terminal device can be performed in different scheduling periods based on a maximum number of blind detection in a preset time period, thereby helping to reduce energy consumption that is caused to a terminal device by blind detection, and reduce blind detection complexity.

The present disclosure relates to the field of communication technologies, and discloses a polar coding/decoding method and apparatus, to improve sequence lookup efficiency. The method includes: obtaining a first sequence from a polar code construction sequence table based on a coding parameter, where the polar code construction sequence table includes at least one coding parameter and at least one sequence corresponding to the at least one coding parameter, the at least one coding parameter is mapped to the at least one sequence in a one-to-one manner, the first sequence is one of the at least one sequence; selecting serial numbers of K polarized channels from the first sequence based on a rate matching scheme and/or a reliability order; placing to-be-coded bits based on the selected serial numbers of the K polarized channels; and performing polar coding, to obtain a coded bit sequence.