Abstract: A data transmission method and apparatus using a clear channel assessment (CCA) detection threshold are disclosed. The method includes: obtaining, by a base station, at least one CCA detection threshold; determining a current CCA detection threshold from the at least one CCA detection threshold; determining transmit power of to-be-sent data based on the current CCA detection threshold; and sending the to-be-sent data to a target terminal based on the transmit power.

Abstract: This application provides a downlink control information (DCI) obtaining method and apparatus. The method includes: determining, by a terminal, predefined search space based on aggregation levels supported by the terminal, where the predefined search space includes search space corresponding to at least one of an aggregation level 16 and an aggregation level 24; and performing, blind detection to obtain the DCI. Alternatively, the method includes: determining, by a terminal, blind detection search space of the terminal from predefined search space based on a quantity of resource blocks (RBs) occupied by an enhanced physical downlink control channel (EPDCCH) and aggregation levels supported by the terminal, where the predefined search space includes corresponding search space obtained when the RB quantity is 16; and performing, blind detection to obtain the DCI.

Abstract: An access method and system, a user equipment, and a network side device are provided. The method includes: receiving, by a user equipment, a first message that carries an identifier of a second network access point, where the second network access point can perform air interface offloading on a first network in which a user equipment is currently located; and when the first message carries identifiers of a plurality of second network access points, selecting, by the user equipment, one second network access point from the plurality of second network access points according to first auxiliary information, and accessing the selected second network access point. By adopting the technical solutions in the embodiments of the present invention, an access delay can be effectively shortened, and access efficiency can improved, thereby effectively implementing offloading.

Abstract: The present disclosure describes a video data processing method and a device. An example method includes: determining, by a network device, a video bitrate, a volume of scheduled video data, and video-played duration of a video service of a terminal; determining, by the network device, a buffer time of the video service of the terminal based on the video bitrate, the volume of scheduled video data, and the video-played duration; and performing, by the network device, video data scheduling on the terminal based on the buffer time.

Abstract: A method for sending a channel reservation signal and a base station, related to the field of communications technologies, includes: detecting, by a base station, whether a system signal is received on an unlicensed channel; and sending, by the base station, a channel reservation signal on the unlicensed channel to reserve the unlicensed channel based on the base station detecting that the system signal is received on the unlicensed channel.

Abstract: Embodiments of the present disclosure provide a method that includes receiving, by supporting user equipment UE, a pairing request message sent by a network side; and acquiring, by the supporting UE, a friend UE short-distance identifier list when self supporting capability information of the supporting UE indicates that the supporting UE supports a friend UE. The method also includes performing, by the supporting UE, identity authentication on the benefitted UE according to the friend UE short-distance identifier list and a short-distance identifier of a benefitted UE that is carried in the pairing request message. The method also includes performing, by the supporting UE, pairing processing with the benefitted UE, and sending a pairing response message to the network side, if the benefitted UE has been authenticated.

Abstract: This application provides a signal transmission method, apparatus, and system, and a device. The method may include determining, by a second access network device, that a first channel is idle. The method may also include sending, by the second access network device, first information that indicates occupancy of the first channel, where the first information includes a first power value and first duration, and the first power value is power used by the second access network device to send a signal through the first channel in the first duration. Therefore, spectrum efficiency of an unlicensed spectrum is improved.

Abstract: This application provides a downlink control information (DCI) obtaining method and apparatus. The method includes: determining, by a terminal, predefined search space based on aggregation levels supported by the terminal, where the predefined search space includes search space corresponding to at least one of an aggregation level 16 and an aggregation level 24; and performing, blind detection to obtain the DCI. Alternatively, the method includes: determining, by a terminal, blind detection search space of the terminal from predefined search space based on a quantity of resource blocks (RBs) occupied by an enhanced physical downlink control channel (EPDCCH) and aggregation levels supported by the terminal, where the predefined search space includes corresponding search space obtained when the RB quantity is 16; and performing, blind detection to obtain the DCI.

Abstract: This application discloses a resource configuration method and an apparatus to support a code rate lower than MCS 0. First indication information is sent by a base station to a terminal device. The first indication information includes a first quantity of physical resource blocks. The physical resource block is used to carry data transmitted between the base station and the terminal device. Second indication information is sent by the base station to the terminal device. The second indication information carries a first parameter. The first parameter is used by the terminal device to determine a second quantity of physical resource blocks and the first quantity of physical resource blocks. The second quantity of physical resource blocks is used to determine a transport block size TBS.

Abstract: The present disclosure describes a video data processing method and a device. An example method includes: determining, by a network device, a video bitrate, a volume of scheduled video data, and video-played duration of a video service of a terminal; determining, by the network device, a buffer time of the video service of the terminal based on the video bitrate, the volume of scheduled video data, and the video-played duration; and performing, by the network device, video data scheduling on the terminal based on the buffer time.

Abstract: Embodiments of the present disclosure provide a data transmission method and apparatus. The method includes: obtaining, by a base station, at least one clear channel assessment (CCA) detection threshold; determining a current CCA detection threshold from the at least one CCA detection threshold; determining transmit power of to-be-sent data based on the current CCA detection threshold; and sending the to-be-sent data to a target terminal based on the transmit power. In this way, a CCA detection threshold is flexibly selected, the transmit power is adaptively adjusted, and a probability of space division multiplexing and spectrum usage efficiency are improved, thereby increasing a system capacity and avoiding interference between systems.

Abstract: Embodiments of the present invention provide a method for controlling a multimode radio communications system, a control server, and a terminal. The method includes: establishing, by the control server, a basic link between the terminal and any one communications system in the multimode radio communications system according to first settings; selecting, by the control server according to second settings, a communications system from the multimode radio communications system as a service communications system for transmission of each service of the terminal; and sending, by the control server, control information to the terminal on the basic link, where the control information is used to indicate the service communications system for transmission of each service of the terminal. The embodiments of the present invention improve a utilization rate of radio resources and user experience in a multimode radio communications environment.

Abstract: A method for controlling a link in cooperative communication includes: confirming that a beneficial user equipment and a pre-supportive user equipment have a capability of performing cooperative communication; separately sending a first-hop link setup request to the beneficial user equipment and the pre-supportive user equipment, so that the beneficial user equipment and the pre-supportive user equipment establish first-hop physical links according to the first-hop link setup request; separately receiving initial measurement information that is sent by the pre-supportive user equipment and/or the beneficial user equipment after the pre-supportive user equipment and/or the beneficial user equipment performs initial measurement on the first-hop physical link; according to the initial measurement information, selecting a supportive user equipment of the beneficial user equipment from the pre-supportive user equipment or selecting a beneficial user equipment that is supported by the supportive user equipment.

Abstract: Embodiments of the present application relate to the field of wireless communications technologies, and provides a communication method. The method includes: in response to detecting that a carrier is idle, determining, by a base station, a first subframe that is used for sending downlink synchronization signals, where the downlink synchronization signals include a primary synchronization signal and a secondary synchronization signal; and sending the downlink synchronization signals to a terminal in the first subframe based on a subframe number of the first subframe and a first correspondence. Correspondingly, the terminal performs detection of the synchronization signals, and performs frame timing based on at least location information of the secondary synchronization signal in the first subframe and the first correspondence. In this way, downlink synchronization in an LBT mechanism can be implemented.

Abstract: The present invention discloses a method for sending a channel reservation signal and a base station, and relates to the field of communications technologies, to reduce resource waste. The method provided in embodiments of the present invention includes: detecting, by a base station, whether the base station receives a system signal on an unlicensed channel; and sending, by the base station if the base station detects that the base station receives the system signal on the unlicensed channel, a channel reservation signal on the unlicensed channel to reserve the unlicensed channel.

Abstract: Embodiments of the present invention provide an access method and system, a user equipment, and a network side device. The method includes: receiving, by a user equipment, a first message that carries an identifier of a second network access point, where the second network access point can perform air interface offloading on a first network in which a user equipment is currently located; and when the first message carries identifiers of a plurality of second network access points, selecting, by the user equipment, one second network access point from the plurality of second network access points according to first auxiliary information, and accessing the selected second network access point. By adopting the technical solutions in the embodiments of the present invention, an access delay can be effectively shortened, and access efficiency can improved, thereby effectively implementing offloading.

Abstract: Embodiments of the present invention provide an access method and system, a user equipment, and a network side device. The method includes: receiving, by a user equipment, a first message that carries an identifier of a second network access point, where the second network access point can perform air interface offloading on a first network in which a user equipment is currently located; and when the first message carries identifiers of a plurality of second network access points, selecting, by the user equipment, one second network access point from the plurality of second network access points according to first auxiliary information, and accessing the selected second network access point. By adopting the technical solutions in the embodiments of the present invention, an access delay can be effectively shortened, and access efficiency can improved, thereby effectively implementing offloading.

Abstract: In the present invention, a network device acquires terminal proximity relationship information and determines, according to the proximity relationship information, a beneficed terminal of multiple UE cooperative communication and at least one adjacent terminal of the beneficed terminal, the network device acquires channel quality information of the beneficed terminal and the at least one adjacent terminal of the beneficed terminal, makes, according to the channel quality information of the beneficed terminal and the at least one adjacent terminal of the beneficed terminal, a decision on whether to trigger the multiple UE cooperative communication for the beneficed terminal, and determines a supporting terminal of the multiple UE cooperative communication for the beneficed terminal according to the acquired channel quality information of the beneficed terminal and the at least one adjacent terminal of the beneficed terminal when it is decided that the multiple UE cooperative communication needs to be triggere

Abstract: Embodiments of the present disclosure provide a method that includes receiving, by supporting user equipment UE, a pairing request message sent by a network side; and acquiring, by the supporting UE, a friend UE short-distance identifier list when self supporting capability information of the supporting UE indicates that the supporting UE supports a friend UE. The method also includes performing, by the supporting UE, identity authentication on the benefitted UE according to the friend UE short-distance identifier list and a short-distance identifier of a benefitted UE that is carried in the pairing request message. The method also includes performing, by the supporting UE, pairing processing with the benefitted UE, and sending a pairing response message to the network side, if the benefitted UE has been authenticated.

Abstract: Embodiments of this application relate to a method for controlling transmission, a network device, and a terminal. The method includes: determining, by a first radio access network device according to a service transmission condition of a terminal in a first single-mode wireless communications system, that a multimode wireless communications system comprises at least two wireless communications systems transmits a service for the terminal; and sending, by the first radio access network device, first control information to the terminal, where the first control information includes link information of the at least two wireless communications systems, so that the terminal switches a service, which is transmitted in the first single-mode wireless communications system, to the multimode wireless communications system according to the link information of the at least two wireless communications systems. In this way, resource utilization of a wireless communications network is improved.