Abstract: A wireless access method and apparatus, the method including sending N first signal sets on N first resources, where N is an integer greater than 1, receiving Z response signals from a terminal for the N first signal sets, where each response signal of the response signals comprises indication information of a resource on which the respective first signal set of the N first signal sets is located, Z is an integer greater than or equal to 1, and Z is less than or equal to N, and sending M second signal sets on M second resources according to the Z response signals, where M is an integer greater than or equal to 1, and each second signal set of the M second signal sets corresponds to at least one of the N first signal sets.

Abstract: A signal transmission method, system and device are described. When measuring a reference signal and determining channel quality, a user equipment (UE) obtains a difference between codeword-to-CSI-RS mapping relationships by using a channel quality measurement model. The UE, using a measurement, calculates an optimized mapping relationship. The UE determines at least one mapping relationship from the mapping relationships, to adjust a codeword-to-CSI-RS mapping relationship of a channel.

Abstract: Embodiments provide a base station, user equipment, and communication signal transmitting and receiving methods. The base station includes: a processing unit, configured to determine a resource configuration of a communication signal, where the resource configuration includes at least two different resource element groups; and a transmitting unit, configured to transmit the communication signal on each resource element group included in the resource configuration to user equipment, where the communication signal transmitted on each resource element group carries at least one piece of same information, and the same information is cell specific or user equipment group specific information.

Abstract: Embodiments of the present invention relate to a transmission method using a dynamically adjusted beam set, a base station, and a terminal. The method includes: sending, by the base station, first indication information to a terminal using first layer signaling, where the first indication information indicates a first beam set; sending, by the base station, second indication information to the terminal using second layer signaling, where the second indication information indicates at least one beam in the first beam set; and sending, by the base station, data to the terminal using the at least one beam.

Abstract: The present disclosure relates to methods for feeding back channel state information, user equipment, and base stations. One example method includes receiving a reference signal from a base station, selecting a precoding matrix W from a codebook according to the reference signal, and sending a precoding matrix indicator (PMI) to the base station, where the PMI corresponds to the selected precoding matrix W.

Abstract: This application relates to the field of mobile communications, and in particular, to technologies of obtaining channel state information in a wireless communications system. In a channel information obtaining method, a base station obtains channel state matrix information of some channels based on uplink reference information sent by a terminal and partial channel state information of channels between the base station and the terminal, to obtain channel state matrix information of the channels between the base station and the terminal. Base on this method, relatively complete channel state matrix information of the channels between the base station and the terminal can be obtained. This helps the base station select an appropriate parameter to transmit data to the terminal without causing an additional delay, performance loss, or cost increase, or consuming more time-frequency resources used for the uplink reference signal.

Abstract: Embodiments of the present invention provide a signal transmission apparatus, system, and method. A first network device detects, in a first resource group, a first signal sent by a second network device, and the first network device determines an mth resource in a second resource group according to an nth resource in the first resource group and a first correspondence.

Abstract: Embodiments provide a method for generating a random access channel ZC sequence, and an apparatus. A method for generating a random access channel ZC sequence includes: generating, by a base station, notification signaling, where the notification signaling instructs user equipment (UE) to generate a random access ZC sequence by using a second restricted set in a random access set; and sending, by the base station, the notification signaling to the UE, so that the UE generates the random access ZC sequence by using the second restricted set, where the random access set includes an unrestricted set, a first restricted set, and the second restricted set; and the second restricted set is a random access set that the UE needs to use when a Doppler frequency shift of the UE is greater than or equal to a first predetermined value.

Abstract: Embodiments of the present invention provide a signal transmission method and a network device. The signal transmission method includes: sending, by a first network device, a first signal before performing cell selection; and sending, by the first network device, a second signal after performing cell selection, where resources used by the first network device to send the first signal and the second signal are different, and the second signal is a random access signal.

Abstract: This application provides a data transmission method and a device. The method includes: determining to-be-sent B code blocks (CBs); mapping the B CBs to resource elements (REs) of a scheduling resource, to obtain mapped data, where the scheduling resource includes L orthogonal frequency division multiplexing (OFDM) symbols, L1 of the L OFDM symbols meet one of a first condition, a second condition, or a third condition, and at least one of the L1 OFDM symbols has at least two groups of adjacent first elements, where a quantity of elements of another CB between adjacent first elements in one group is the same as that of the other group, and the first elements are elements in one partial CB; and sending the mapped data to a terminal device.

Abstract: Embodiments of this application disclose a parameter configuration method and apparatus, relate to the field of communications technologies, and specifically provide a method and an apparatus for setting a resource unit bundling size, to help improve accuracy of a channel estimation result. The method may include: generating parameter configuration signaling, and sending the parameter configuration signaling. The parameter configuration signaling is used to indicate the resource unit bundling size. The resource unit bundling size may be applied to at least two inconsecutive time-frequency resources in frequency domain, and each time-frequency resource includes at least one consecutive resource unit in frequency domain; or may be applied to at least two inconsecutive time-frequency resources in time domain, and each time-frequency resource includes at least one consecutive resource unit in time domain.

Abstract: A data transmission method includes: allocating, based on a power ratio value of near user equipment to far user equipment in two paired user equipments, a transmit power to each of the near user equipment and the far user equipment, where the power ratio value is a ratio in a first ratio set, at least one ratio in the first ratio set can be selected from a second ratio set. A plurality of power ratio values of near user equipment to far user equipment in two paired user equipments can be provided.

Abstract: A transmit diversity method, a device, and a system are described herein. The method includes: measuring, by a second network device, channel state information based on a pilot signal, and sending rank index information and precoding matrix index information to a first network device based on the channel state information; receiving, by the first network device, the rank index information and the precoding matrix index information that are sent by the second network device; determining a diversity coding scheme based on the rank index information; determining a precoding matrix based on the precoding matrix index information; and performing transmission processing on to-be-transmitted data based on the diversity coding scheme and the precoding matrix.

Abstract: The present disclosure relates to methods for feeding back channel state information, user equipment, and base stations. One example method includes receiving a reference signal from a base station, selecting a precoding matrix W from a codebook according to the reference signal, and sending a precoding matrix indicator (PMI) to the base station, where the PMI corresponds to the selected precoding matrix W.

Abstract: A precoding matrix set determining method and apparatus, and a parameter indication information sending method and apparatus are provided. The precoding matrix set determining method includes: determining, by a first network device, a parameter used for determining a precoding matrix set, where the parameter includes at least one of a phase parameter, an amplitude parameter, a quantity of vectors in the precoding matrix set, a quantity of vectors in a first codebook set in dual-codebook feedback, and a quantity of vectors in a second codebook set in the dual-codebook feedback, and the parameter is not fixed; and using the parameter to determine the precoding matrix set, where the precoding matrix set includes at least one precoding matrix. By using this solution, flexibility of feeding back a precoding matrix indicator is improved.

Abstract: Embodiments of the present invention provide a signal transmission apparatus, system, and method. A first network device detects, in a first resource group, a first signal sent by a second network device, and the first network device determines an mth resource in a second resource group according to an nth resource in the first resource group and a first correspondence.

Abstract: Embodiments of the present invention disclose a signal transmission method, including: sending, by a first device, a first reference signal to a second device, where the first reference signal is used for phase tracking; the first reference signal is mapped to a first symbol; the first symbol includes a symbol that carries a data signal and that precedes a second symbol; the second symbol is one or more consecutive symbols carrying a DMRS; and the one or more symbols include the 1st symbol carrying the DMRS. According to the foregoing solution, it can be ensured that a PT-RS is also mapped to a symbol to which a data channel is mapped and that precedes a symbol carrying a DMRS, thereby ensuring phase noise estimation performance.

Abstract: A reference signal transmission method includes: sending, by a terminal, a first reference signal and a second reference signal; and correspondingly, receiving, by a network device, the first reference signal and the second reference signal, where the first reference signal is mapped to a plurality of symbols and is used for estimation of channel state information, the second reference signal is mapped to at least two of the plurality of symbols and is used for phase tracking, and a subcarrier to which the second reference signal is mapped on one of the at least two symbols has a same frequency-domain location as a subcarrier to which the second reference signal is mapped on the rest of the at least two symbols. With the foregoing solution, accuracy of channel state information estimation can be improved.

Abstract: Embodiments of the present invention disclose an interference coordination method and apparatus. The method includes: receiving direction restriction information, where the direction restriction information includes angle restriction information, and the angle restriction information is used to indicate a restricted transmission direction; determining a signal preprocessing manner, where a transmission direction formed based on the signal preprocessing manner does not include the restricted transmission direction; and feeding back the signal preprocessing manner. According to the embodiments of the present invention, signaling overheads can be reduced, and an interference coordination application scenario can be expanded.

Abstract: Embodiments of the present invention provide a channel measurement and feedback method, a network device, and a system, and relate to the field of communications technologies. The method includes: receiving, by a first network device, pilot port configuration information sent by a second network device, where the pilot port configuration information is used to describe at least two pilot ports; measuring, by using the at least two pilot ports, a pilot signal sent by the second network device, and determining first information, where the first information includes at least one of second information of the first network device or third information of a third network device when it is assumed that the first network device and the third network device communicate with the second network device by performing spatial multiplexing on a same time frequency resource.