Abstract: Embodiments of the present invention disclose a data transmission method, a base station, and user equipment. The method in the embodiments of the present invention includes: receiving, by a base station, a first target sequence and uplink data that are sent by user equipment; determining, by the base station according to a first mapping relationship, a first target uplink sending parameter corresponding to the first target sequence, where the first mapping relationship is used to indicate a correspondence between an uplink sending parameter and a sequence; and demodulating and decoding, by the base station, the uplink data according to the first target uplink sending parameter.

Abstract: The present invention provides a synchronization signal receiving method, including: receiving, by a receive end, a synchronization sequence sent by a transmit end, where the synchronization sequence includes a carrier frequency synchronization sequence, the carrier frequency synchronization sequence is zc(m)=e±j?m(m+1+2q)/L, m=0, 1, . . . , L?1, q?Z, L indicates a length of the carrier frequency synchronization sequence, q indicates a parameter of the carrier frequency synchronization sequence, Z indicates an integer set, e±j?m(m+1+2q)/L indicates the (±j?m(m+1+2q)/L)th power of e, and e is a natural constant; and performing, by the receive end, frequency offset estimation according to the received synchronization sequence, to obtain a frequency offset estimation value. With the technical solutions of embodiments of the present invention, accuracy of frequency offset estimation can be improved.

Abstract: Embodiments of the present invention provide a broadcast control bandwidth allocation and data transceiving method. The method includes: acquiring location information and channel distribution information that are of current user equipment; preprocessing a time-frequency resource of a channel according to the location information and the channel distribution information that are of the current user equipment; updating bandwidth allocation information according to the preset bandwidth and quantities of each data channel and each control channel and the preset quantities of repetitions corresponding to each data channel and each control channel; and broadcasting broadcast information to the user equipment by using a broadcast channel.

Abstract: Embodiments of the present invention disclose a data transmission method, a base station, and user equipment. The method in the embodiments of the present invention includes: receiving, by a base station, a first target sequence and uplink data that are sent by user equipment; determining, by the base station according to a first mapping relationship, a first target uplink sending parameter corresponding to the first target sequence, where the first mapping relationship is used to indicate a correspondence between an uplink sending parameter and a sequence; and demodulating and decoding, by the base station, the uplink data according to the first target uplink sending parameter.

Abstract: The present invention provides a synchronization signal receiving method, including: receiving, by a receive end, a synchronization sequence sent by a transmit end, where the synchronization sequence includes a carrier frequency synchronization sequence, the carrier frequency synchronization sequence is zc(m)=e±j?m(m+1+2q)/L, m=0, 1, . . . , L?1, q?Z, L indicates a length of the carrier frequency synchronization sequence, q indicates a parameter of the carrier frequency synchronization sequence, Z indicates an integer set, e±j?m(m+1+2q)/L indicates the (±j?m(m+1+2q)/L)th power of e, and e is a natural constant; and performing, by the receive end, frequency offset estimation according to the received synchronization sequence, to obtain a frequency offset estimation value. With the technical solutions of embodiments of the present invention, accuracy of frequency offset estimation can be improved.

Abstract: Embodiments of the present invention provide a broadcast control bandwidth allocation and data transceiving method. The method includes: acquiring location information and channel distribution information that are of current user equipment; preprocessing a time-frequency resource of a channel according to the location information and the channel distribution information that are of the current user equipment; updating bandwidth allocation information according to the preset bandwidth and quantities of each data channel and each control channel and the preset quantities of repetitions corresponding to each data channel and each control channel; and broadcasting broadcast information to the user equipment by using a broadcast channel.

Abstract: A method and a device for initial synchronization between D2D terminals are used to implement initial synchronization between the D2D terminals. A D2D master terminal measures a time-frequency resource set used to transmit a synchronization signal, and reports a measurement result to a network device; the D2D master terminal receives a synchronization resource that is allocated by the network device to the D2D master terminal according to the measurement result reported by the D2D master terminal; and the D2D master terminal sends the synchronization signal according to the synchronization resource allocated to the D2D master terminal.

Abstract: Embodiments of the present invention includes: acquiring, by the DS-user terminal, a first timing offset, where the first timing offset is a difference between a start time point of receiving data by the DS-user terminal and a start time point of sending data by a DM-user terminal, the start time point of sending data by the DM-user terminal is a start time point of sending data after the DM-user terminal is synchronized with a network-side device, and the start time point of receiving data by the DM-user terminal is a start time point of receiving data after the DM-user terminal is synchronized with the network-side device; and adjusting, by the DS-user terminal according to the first timing offset, the start time point of receiving data by the DS-user terminal, so as to synchronize with the DM-user terminal and the network-side device.

Abstract: A method for controlling user equipment (UE) access in a multi-frequency system in the field of communication is provided. The method includes the following steps. A network side receives an access preamble sent by a UE on one frequency. When the network side determines that the UE needs to access on another frequency, the network side notifies the UE to access by switching to another frequency. Network device is also provided at the same time. Therefore, the UE access can be controlled according to a practical situation of the UE or each frequency, and the flexibility of the multi-frequency system is enhanced.