Methods and apparatuses for wireless communications are described. In an aspect, a method and apparatus may include determining that a second transmission is decoded incorrectly in response to a first received indication on a communication channel. The method and apparatus may further include transmitting, on the communication channel, a third transmission and a fourth transmission based on a determination that the second transmission is decoded incorrectly, wherein the third transmission corresponds to a coded bit set of the third transmission including a first group of information bits of a coded bit set of a first transmission and a second group of information bits of a coded bit set of the second transmission and the fourth transmission corresponds to a coded bit set of the fourth transmission including a combination of the coded bit sets of the first transmission, the second transmission, and the third transmission.

Embodiments of the present disclosure relate to a communication method and a communication device. There is provided a communication method implemented at a first device. The method comprises: determining quantities of information of units in control information; mapping, based on the quantities of information of the units and reliabilities of subchannels for carrying the control information, the units to a subchannels; and transmitting the control information to a second device via the subchannel. There is also provided a communication method implemented at a second device, as well as corresponding first device and second device.

A transmission apparatus, in particular for use in a Low Throughput Network, comprises an FEC encoder configured to encode payload data into FEC code words each having a predetermined code word length, and a frame forming section configured to form a frame having a predetermined frame length. A frame comprises a first frame portion having a first predetermined length of an integer multiple of the predetermined code word length and a second frame portion having a second predetermined length shorter than the predetermined code word length. The frame forming section is configured to include an FEC code word and a predetermined number of repetitions of said FEC code word into the first frame portion of a frame and to include a selected number of bits of said FEC code word into the second frame portion of said frame.

Disclosed herein are systems and methods for forward packet recovery in a communication network with constrained network bandwidth overhead. In exemplary embodiments, a target byte protection ratio is determined. Error correcting frames are dynamically generated by a first processor such that error correcting information can be generated to approximate the target byte protection ratio. The data packets and error correcting information are then transmitted across one or more communication networks to a second processor. The second processor can use the error correcting information to regenerate or replace data packets missing or corrupted in transmission across one or more communication networks.

An LDPC code encoding and modulation method and a communications apparatus are provided to resolve a problem of poor transmission performance and low transmission reliability that are caused in an existing modulation method. Under the method, an information bit sequence S.sub.b can be obtained. The S.sub.b can be encoded by using a LDPC matrix H to generate an encoded code sequence S.sub.c. The S.sub.c can be modulated to obtain a modulated symbol sequence S.sub.M. This modulation may include mapping bits in a least reliable code block in the S.sub.c to non-least reliable bit locations for constellation modulation. S.sub.M can be sent to a receive end. In this way, reliability of all symbols in the S.sub.M is relatively high and uniform. A bit error rate can be effectively reduced, so that encoding performance is improved and more reliable transmission is implemented.

Embodiments of this application provide a data transmission method and device, so as to increase an uplink/downlink data transmission throughput. The method includes: splitting a to-be-transmitted transport block into N code blocks with incompletely equal sizes, where N is an integer greater than or equal to 2; performing error correction coding on the N code blocks to obtain N encoded bit blocks; and non-orthogonally transmitting the N encoded bit blocks by using resources that are the same in at least one dimension of a time domain, a frequency domain, a space domain, and a code domain.

Aspects of the present disclosure relate to retransmissions of data within wireless communication networks. For a retransmission, at least a portion of the encoded bits of an original transmission may be mapped to different bit locations in one or more modulated symbols based on a non-random mapping rule. In some examples, the encoded bits of a symbol may be reversed within the symbol for a retransmission. In other examples, the first and last encoded bits within a symbol may be switched for a retransmission. Other non-random mapping rules, such as a bit location offset, may also be used to map encoded bits to different bit locations in the modulated symbol within a retransmission.

Certain aspects of the present disclosure relate to methods and apparatus relating to an RE mapping rule for UCI piggyback on PUSCH. For example, a method may include determining a set of uplink resources to use for transmitting acknowledgment (ACK) information in a physical uplink shared channel (PUSCH) transmission, wherein the determination is based at least in part on a payload size of the ACK information, and transmitting the ACK information using the determined set of uplink resources.

A technique for performing a multi-layer transmission from a transmitting station to a receiving station on a radio frequency is described. The multi-layer transmission comprises multiple layers having different robustnesses (704, 706) on the radio frequency. As to a method aspect of the technique, first data of a first hybrid automatic repeat request, HARQ, process is transmitted on a first layer of the multi-layer transmission simultaneously with second data of a second HARQ process on a second layer of the multi-layer transmission.

A decrease in communication throughput and so on is suppressed even in a case where uplink control information is multiplexed on an uplink data channel. A user terminal includes a transmitting section that transmits, on an uplink shared channel, retransmission control information (HARQ-ACK) and channel state information including a plurality of channel state information parts (CSI parts), and a control section that performs control to allocate at least the HARQ-ACK and a specific CSI part to different resources.