Abstract: The present disclosure provide a data transmission method, including: receiving, by a central processing node, downlink user data from a first gateway GW; sending, by the central processing node, the downlink user data to a corresponding base station; and when it is determined that an interface between the central processing node and the first GW is congested, sending, by the central processing node, a first bearer switching request message to the first GW, where the first bearer switching request message is used to instruct the first GW to bypass the central processing node when transmitting data. In the embodiments of the present invention, when determining that an interface between a central processing node and a first GW is congested, the central processing node sends a first bearer switching request message to the first GW, so that the first GW transmits downlink user data with the central processing node bypassed.

Abstract: A visible light communications VLC related device and method is presented. In embodiments in which a terminal can receive only visible light data, the terminal can feed back data to a VLC device, thereby implementing bidirectional data transmission. In the method, the terminal feeds back uplink data to the visible light communications device using a wireless communication signal, to implement bidirectional data transmission in a visible light communication scenario.

Abstract: Embodiments of the present invention disclose a method for accessing a base station, a base station and a user equipment, belonging to the field of communications technologies. The method includes: establishing, by a current macro base station, a control plane connection with a user equipment according to an access request of the user equipment, and assigning a first cell-radio network temporary identity to the user equipment; and when receiving a measurement report of pico base stations reported by the user equipment, selecting a pico base station for the user equipment according to a preset policy so that the user equipment establishes a data plane connection with the pico base station, and notifying context information of the user equipment to the pico base station, where the context information includes the first cell-radio network temporary identity assigned to the user equipment.

Abstract: This application discloses a wireless assistance method, apparatus, and system. The wireless assistance apparatus includes an obtaining module, a determining module, and a transmission module. The obtaining module is configured to obtain network status information, and the obtaining module transmits the network status information to the determining module. The determining module is configured to receive the network status information, and determine, according to the network status information, a mobile access point that needs to perform wireless assistance, and the determining module transmits information about the mobile access point to the transmission module. The transmission module is configured to receive the information about the mobile access point, and transmit assistance command information to the mobile access point, where the assistance command information is information for instructing the mobile access point to perform wireless assistance.

Abstract: A wireless communication method and an apparatus are provided. The method includes: sending, by a dual-mode terminal, first binding relationship information to an access device on a network side by using a wireless communications module; receiving, by using a visible light receiver, downlink data sent by a visible light transmitter corresponding to the access device; receiving, by using the wireless communications module, second binding relationship information sent by the access device on the network side, or, receiving, by using the visible light receiver, second binding relationship information sent by the visible light transmitter, where the second binding relationship information carries information about a correspondence between a wireless access point of the access device and the visible light transmitter; and sending, by using the wireless communications module, uplink data and/or a feedback message of the downlink data to the wireless access point of the access device.

Abstract: An embodiment discloses a method, an apparatus, and a communications system for reciprocity calibration between UEs. The method includes sending, by a communication device, a first reference signal to a first user equipment UE, so that the first UE estimates first channel information of a first channel between the first UE and the communication device according to the first reference signal and receiving the first channel information fed back by the first UE; receiving a second reference signal sent by the first UE. The method also includes estimating second channel information of a second channel between the communication device and the first UE according to the second reference signal, and performing reciprocity calibration according to the first channel information and the second channel information.

Abstract: A method and an apparatus for adjusting transmit powers of base station antennas, and a base station are provided. The method includes receiving an input precoding matrix of a transmit power-limited antenna set, where the precoding matrix is determined according to a scheduling result of a user equipment communicating with a base station in each layer of each subband in a system; adjusting the precoding matrix according to a transmit power limit requirement of the transmit power-limited antenna set, a system capacity improvement requirement, or a coverage performance improvement requirement to obtain an adjusted precoding matrix; and adjusting a stream transmit power of the transmit power-limited antenna set by using the adjusted precoding matrix.

Abstract: Embodiments of the present invention disclose a transmission mode selecting method, an antenna TX/RX combination determining method, device, and system. The transmission mode selecting method includes: obtaining a first system capacity in a half-duplex transmission mode; obtaining a second system capacity in a full-duplex transmission mode, where the second system capacity is the maximum value among system capacities of a universal set of candidate antenna TX/RX combinations in the full-duplex transmission mode, or the maximum value among system capacities of a first subset of the candidate antenna TX/RX combinations in the full-duplex transmission mode, or a system capacity exceeding a system capacity threshold; and selecting a target transmission mode according to a comparison result between the first system capacity and the second system capacity, where the target transmission mode is a transmission mode corresponding to a larger value between the first system capacity and the second system capacity.

Abstract: Embodiments of the present invention provide a method and an apparatus for reciprocity calibration between base stations, which relate to the communications field, and can improve precision of reciprocity calibration between base stations. The method includes: obtaining, by each base station by means of calculation, a precoding vector corresponding to a selected subcarrier of the base station; sending, by all the base stations to UE by using the selected subcarriers of the base stations, downlink user-dedicated reference signals that are mutually orthogonal between cells corresponding to the base stations; obtaining, by each base station, an inter-base station calibration compensation coefficient of the selected subcarrier of the base station; and adjusting, by each base station, a self-calibration matrix of the selected subcarrier according to the inter-base station calibration compensation coefficient of the selected subcarrier of the base station.

Abstract: Embodiments of the present invention provide a method, an apparatus, and a system for selecting serving nodes for access, where the method includes: obtaining reference signal received parameters of at least two nodes; selecting a downlink serving node from the at least two nodes according to the reference signal received parameter of each node; and sending an uplink signal, so that the downlink serving node selects an uplink serving node from the at least two nodes according to the uplink signal; or, selecting an uplink serving node from the at least two nodes according to the reference signal received parameter of each node, and sending an uplink signal. In the embodiments of the present invention, a user equipment selects a downlink serving node from at least two nodes according to the reference signal received parameter of each node; then the user equipment sends an uplink signal.

Abstract: The present invention provides a user scheduling method, a master base station, a user equipment, and a heterogeneous network. The method includes: receiving, by a master base station, a downlink interference indicator DII forwarded by a serving slave base station serving a user equipment UE, where the DII is sent to the serving slave base station by the UE attached to the serving slave base station, and when the DII is greater than a preset threshold, the DII indicates that the UE is in a high DII region; determining, according to the DII, whether the UE is in a high DII region; and if the UE is in a high DII region, allocating, when performing scheduling, fewer resources that may interfere with the UE.

Abstract: A method and an apparatus for adjusting transmit powers of base station antennas, and a base station are provided. The method includes receiving an input precoding matrix of a transmit power-limited antenna set, where the precoding matrix is determined according to a scheduling result of a user equipment communicating with a base station in each layer of each subband in a system; adjusting the precoding matrix according to a transmit power limit requirement of the transmit power-limited antenna set, a system capacity improvement requirement, or a coverage performance improvement requirement to obtain an adjusted precoding matrix; and adjusting a stream transmit power of the transmit power-limited antenna set by using the adjusted precoding matrix.

Abstract: Embodiments of the present invention disclose a transmission mode selecting method, an antenna TX/RX combination determining method, device, and system. The transmission mode selecting method includes: obtaining a first system capacity in a half-duplex transmission mode; obtaining a second system capacity in a full-duplex transmission mode, where the second system capacity is the maximum value among system capacities of a universal set of candidate antenna TX/RX combinations in the full-duplex transmission mode, or the maximum value among system capacities of a first subset of the candidate antenna TX/RX combinations in the full-duplex transmission mode, or a system capacity exceeding a system capacity threshold; and selecting a target transmission mode according to a comparison result between the first system capacity and the second system capacity, where the target transmission mode is a transmission mode corresponding to a larger value between the first system capacity and the second system capacity.

Abstract: Embodiments of the present invention provide a method, an apparatus, and a system for handover processing. The method includes: receiving a handover request sent by a UE for handover to a micro base station; and sending instruction information to the UE according to a preset rule and the handover request, so as to instruct the UE to send start information, where the start information is used to instruct the micro base station to start an interference coordination mode used to enable the micro base station to mute preset time-frequency resources and corresponding to the start information. This prevents formation of a victim UE and greatly mitigates impacts caused by a coverage hole.

Abstract: Embodiments of the present invention disclose a method for accessing a base station, a base station and a user equipment, belonging to the field of communications technologies. The method includes: establishing, by a current macro base station, a control plane connection with a user equipment according to an access request of the user equipment, and assigning a first cell-radio network temporary identity to the user equipment; and when receiving a measurement report of pico base stations reported by the user equipment, selecting a pico base station for the user equipment according to a preset policy so that the user equipment establishes a data plane connection with the pico base station, and notifying context information of the user equipment to the pico base station, where the context information includes the first cell-radio network temporary identity assigned to the user equipment.