This application provides a data transmission method, a terminal device, and a network device. The method includes: sending, by a terminal device, first information to a network device, where the first information is used to indicate a first channel quality indicator (CQI) corresponding to a first block error rate; and sending, by the terminal device, second information to the network device by using radio resource control (RRC) signaling or media access control (MAC) signaling, where the second information is used to indicate a difference between the first CQI and a second CQI, the second CQI is a CQI corresponding to a second block error rate, and the first block error rate is greater than the second block error rate.

The present disclosure provides a method of generating codebook in a wireless communication system with multiple antenna arrays, as well as a wireless communication system, base station and terminal using the codebook for communication. The method comprises steps of: providing a basic codebook which contains multiple pre-coding matrices; and assigning phase offsets to certain pre-coding matrices in the basic codebook to form a codebook with phase offset. The feedback overhead from a client to a base station side is reduced and a good precision of feedback for multi-antenna array is kept by applying the method of generating codebook and using the generated codebook in the wireless communication system, base station and terminal.

Disclosed is a 5.sup.th generation (5G) or pre-5G communication system to be provided for supporting a data transmission rate higher than that of a 4.sup.th generation (4G) communication system such as long term evolution (LTE). Examples of the present invention provide a beam selection and feedback device and method for minimizing complexity and overhead without performance deterioration in a beamforming MIMO wireless communication system. According to one example of the present invention, an apparatus of a receiving device in a wireless communication system comprises: a transceiver; and at least one processor, wherein the at least one processor is configured to: select at least one beam pair from among a plurality of transmission/reception beam pairs, and control the transceiver to transmit feedback information including indication information indicating whether the at least one beam pair is identical to a beam pair selected in a previous beamforming procedure.

A communication device is arranged to operate in a cellular communication system and report Channel State Information, CSI, including a channel quality by a Channel Quality Indicator, CQI, which reports a CQI set. The communication device comprises a receiver arranged to receive antenna-specific reference signals, a channel estimator arranged to evaluate channel conditions from the reference signals to determine values of a CQI set, a reporting processor arranged to determine whether a bounded differential reporting format prevents values of the CQI set to be accurately reported, and to determine a CQI set such that the bounded differential reporting format allows the values of the CQI set to be reported to reduce under-reporting or over-reporting errors that arise from the use of the bounded differential reporting format, and to form a CSI report including the values of the CQI set using the bounded differential reporting format, and a transmitter arranged to send the CSI report. A method and computer program for implementing the method are also disclosed.

Apparatuses, methods, and systems are disclosed for encoding reference signal received powers. One apparatus (200) includes a processor (202) that: determines (402) a reference signal received power corresponding to each beam of multiple beams to result in a set of determined reference signal received powers; orders (406) the set of determined reference signal received powers in descending order to result in an ordered list of reference signal received powers; and encodes (408) a difference between each two adjacent reference signal received powers of the ordered list of reference signal received powers to result in an encoded ordered list of reference signal received powers.

A terminal is disclosed including a transmitter that transmits information regarding at least one reception power (RSRP: Reference Signal Received Power) and a processor that, when reporting of a first RSRP and a second RSRP is carried out, controls to transmit a value corresponding to the first RSRP, and a value corresponding a difference between the first RSRP and the second RSRP. In other aspects, a radio communication method is disclosed.

According to one embodiment of the present specification, a method by which a terminal can report beam information in a wireless communication system can be provided, and the method by which a terminal reports beam information comprises: obtaining information related with beam reporting from a base station; triggering beam reporting; receiving a signal related with beam reporting from the base station; measuring the signal related with beam reporting; and reporting the beam information to the base station based on the measured signal, wherein the beam information includes information on best beams among all available beams and the beam information can be reported based on reporting configuration.

The present disclosure provides a method of generating codebook in a wireless communication system with multiple antenna arrays, as well as a wireless communication system, base station and terminal using the codebook for communication. The method comprises steps of: providing a basic codebook which contains multiple pre-coding matrices; and assigning phase offsets to certain pre-coding matrices in the basic codebook to form a codebook with phase offset. The feedback overhead from a client to a base station side is reduced and a good precision of feedback for multi-antenna array is kept by applying the method of generating codebook and using the generated codebook in the wireless communication system, base station and terminal.

Disclosed are an information transmission method and device for improving CSI feedback performance and providing finer CSI feedback. The information transmission method of the present invention comprises: determining a quantity of layers transmitted on a channel; and determining, according to the quantity of the layers transmitted on the channel, channel state information (CSI) fed back for the respective layers, and transmitting the same, and the CSI fed back for the respective layers comprises information about multi-level beams.

In order to address the potential for antenna failure in large antenna arrays, a method, a computer-readable medium, and an apparatus are provided for wireless communication, e.g., at a base station or CPE. The apparatus detects a failure of a plurality of antenna elements in an antenna array associated with an antenna module in an antenna array comprising a plurality of antenna modules. The apparatus then applies a mitigation procedure in response to detecting the failure, e.g., when a fraction of antenna elements for which a failure is detected meets a threshold. The mitigation procedure may include any of switching to a different codebook, increasing DL or UL transmission power, or a VGA. The failure may be detected by transmitting pilot signals using sets of antenna elements of the antenna array and using signal strength measurements to detect antenna element failures.