Abstract: Embodiments of the present disclosure disclose a synchronization signal sending method, including: determining, by a transmit end device, a first signal, where the transmit end device operates in a serving cell, the first signal includes a first synchronization sequence, the first synchronization sequence is a sequence obtained after a special ZC sequence is cyclically shifted by a first quantity of digits and then dot multiplication or conjugate multiplication is performed on the cyclically shifted special ZC sequence and a characteristic sequence, the special ZC sequence is a ZC sequence with a root index being +1 or ?1, and the characteristic sequence and/or the first quantity of digits are/is corresponding to a cell identity of the serving cell. In the synchronization signal sending method provided in the embodiments of the present disclosure, signal synchronization can be implemented in an M2M technology by using the ZC sequence.

Abstract: The present invention relates to the field of wireless communications technologies. In a receiving device, a receiving module receives a synchronization signal including a first signal and a second signal. The first signal includes N1 generalized ZC sequences, and the second signal includes N2 generalized ZC sequences. The second signal is used to distinguish different cells or different cell groups. There are at least two generalized ZC sequences with different root indexes in (N1+N2) generalized ZC sequences. A processing module performs a first sliding correlation operation and a second sliding correlation operation on the synchronization signal, and performs symbol timing synchronization according to a relationship between a sliding correlation peak generated when a sliding correlation is performed on the N1 generalized ZC sequences and a sliding correlation peak generated when a sliding correlation is performed on the N2 generalized ZC sequences.

Abstract: The present invention relates to the mobile communications field, and in particular, to a synchronization signal sending method. A network device obtains a first signal after performing discrete Fourier transform DFT and orthogonal frequency division multiplexing OFDM modulation, or OFDM modulation on a ZC sequence whose root index is 1; the network device obtains a second signal after performing DFT and OFDM modulation, or OFDM modulation on a conjugate sequence of the ZC sequence whose root index is 1; the network device generates a synchronization signal, where the synchronization signal includes the first signal and the second signal; and the network device sends the synchronization signal to a terminal device. By using this method, when there is a relatively large frequency offset between the terminal device and the network device, an M2M service requirement can still be met.

Abstract: The present invention relates to the field of communications technologies, and provides an uplink data transmission method and apparatus. The method includes: determining a size of a to-be-sent data packet; obtaining a time-frequency resource and a data transmission format that correspond to the size of the to-be-sent data packet; and sending the to-be-sent data packet to a base station on the time-frequency resource according to the data transmission format.

Abstract: A communication method, a base station, user equipment, and a system are provided. The method includes: receiving uplink data that is sent by the user equipment in a specified multiple-access manner on a time-frequency resource corresponding to the specified multiple-access manner; and sending downlink data to the user equipment in a corresponding multiple-access manner on a time-frequency resource corresponding to the corresponding multiple-access manner, where the corresponding multiple-access manner is a multiple-access manner that is obtained by searching a at least two multiple-access manners according to a prestored correspondence and that is associated with the specified multiple-access manner. In this way, a problem that because one multiple-access manner is used in a same communications system, requirements of different user equipments cannot be met at the same time is resolved.

Abstract: Embodiments of the present invention provide a wireless communications method, user equipment, a base station and a system, and relate to the field of wireless communications. The method includes: acquiring a frequency domain spreading factor, a symbol-level spreading factor and a transmission time interval-level spreading factor; and performing frequency domain spreading, symbol-level spreading and transmission time interval-level spreading on first to-be-sent information respectively according to the acquired spreading factors and sending first spread information; or, despreading, according to the acquired spreading factors, second spread information sent by a base station.

Abstract: Embodiments of the present disclosure provide a wireless communications method, user equipment, a base station and a system, and relate to the field of wireless communications. The method includes: acquiring a frequency domain spreading factor, a symbol-level spreading factor and a transmission time interval-level spreading factor; and performing frequency domain spreading, symbol-level spreading and transmission time interval-level spreading on first to-be-sent information respectively according to the acquired spreading factors and sending first spread information; or, despreading, according to the acquired spreading factors, second spread information sent by a base station.

Abstract: A communication method, a base station, user equipment, and a system are provided. The method includes: receiving uplink data that is sent by the user equipment in a specified multiple-access manner on a time-frequency resource corresponding to the specified multiple-access manner; and sending downlink data to the user equipment in a corresponding multiple-access manner on a time-frequency resource corresponding to the corresponding multiple-access manner, where the corresponding multiple-access manner is a multiple-access manner that is obtained by searching a at least two multiple-access manners according to a prestored correspondence and that is associated with the specified multiple-access manner. In this way, a problem that because one multiple-access manner is used in a same communications system, requirements of different user equipments cannot be met at the same time is resolved.

Abstract: Embodiments of the present invention provide a data sending and receiving method and device. The method includes: receiving a threshold; if a data volume of a packet to be sent is less than the threshold, sending the packet in a first data transmission manner; and if a data volume of the packet is greater than or equal to the threshold, sending the packet in a second data transmission manner. By adopting the technical solution of the present invention, a resource waste caused by transmitting small data in a data transmission manner used for transmitting a large packet in the prior art can be reduced, transmission efficiency of small data can be improved, and a transmission delay can be reduced.

Abstract: Embodiments of the present invention disclose a broadcast information sending method, a broadcast information receiving method, a device, and a system, relate to the communications field, and are used to reduce system overheads, and improve coverage performance. The method provided by the embodiments of the present invention includes: sending, by a network device on a physical broadcast channel PBCH, PBCH information to user equipment UE, and sending, by the network device, the PBCH information in a specific radio frame in each period T of the PBCH, where the PBCH information only includes information about a system frame number SFN, and the period T is greater than one radio frame.

Abstract: The present invention relates to the field of communications technologies, and discloses a data transmission method, user equipment, a base station, and a system. The method includes: selecting, by user equipment (UE), a preamble sequence, and acquiring an uplink time-frequency resource and a downlink time-frequency resource that are corresponding to the preamble sequence; sending the preamble sequence to a base station, so that the base station decodes the preamble sequence, and determines, according to the decoded preamble sequence, the uplink time-frequency resource and the downlink time-frequency resource that are corresponding to the decoded preamble sequence.

Abstract: Embodiments of the present invention provide a data sending and receiving method and device. The method includes: receiving a threshold; if a data volume of a packet to be sent is less than the threshold, sending the packet in a first data transmission manner; and if a data volume of the packet is greater than or equal to the threshold, sending the packet in a second data transmission manner. By adopting the technical solution of the present invention, a resource waste caused by transmitting small data in a data transmission manner used for transmitting a large packet in the prior art can be reduced, transmission efficiency of small data can be improved, and a transmission delay can be reduced.

Abstract: Embodiments of the present disclosure disclose a synchronization signal sending method, including: determining, by a transmit end device, a first signal, where the transmit end device operates in a serving cell, the first signal includes a first synchronization sequence, the first synchronization sequence is a sequence obtained after a special ZC sequence is cyclically shifted by a first quantity of digits and then dot multiplication or conjugate multiplication is performed on the cyclically shifted special ZC sequence and a characteristic sequence, the special ZC sequence is a ZC sequence with a root index being +1 or ?1, and the characteristic sequence and/or the first quantity of digits are/is corresponding to a cell identity of the serving cell. In the synchronization signal sending method provided in the embodiments of the present disclosure, signal synchronization can be implemented in an M2M technology by using the ZC sequence.

Abstract: Embodiments of the present disclosure provide a wireless communications method, user equipment, a base station and a system, and relate to the field of wireless communications. The method includes: acquiring a frequency domain spreading factor, a symbol-level spreading factor and a transmission time interval-level spreading factor; and performing frequency domain spreading, symbol-level spreading and transmission time interval-level spreading on first to-be-sent information respectively according to the acquired spreading factors and sending first spread information; or, despreading, according to the acquired spreading factors, second spread information sent by a base station.

Abstract: Embodiments of the present invention provide a wireless communications method, user equipment, a base station and a system, and relate to the field of wireless communications. The method includes: acquiring a frequency domain spreading factor, a symbol-level spreading factor and a transmission time interval-level spreading factor; and performing frequency domain spreading, symbol-level spreading and transmission time interval-level spreading on first to-be-sent information respectively according to the acquired spreading factors and sending first spread information; or, despreading, according to the acquired spreading factors, second spread information sent by a base station.

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: The present application provides a synchronization signal sending apparatus, sending method, receiving apparatus, and receiving method, and a system. The signal sending apparatus includes a determining unit and a sending unit. By using embodiments of the present invention, a synchronization signal is in a form of a differential signal, and has relatively strong frequency deviation resistance; and synchronization signals from different transmit ends satisfy a pre-determined relationship property. Therefore, when a receive end performs synchronization by using the synchronization signal, the receive end can eliminate an interfering signal by using the relationship property between the synchronization signals from the different transmit ends, so as to achieve an objective of distinguishing the different transmit ends or distinguishing signals from different cells.

Abstract: The signal transmitting method includes that a transmit end modulates a first frequency band that corresponds to a first signal to be transmitted by the single carrier system onto a second frequency band that corresponds to a second signal to be transmitted by the multicarrier system, to obtain a transmit signal including at least the first signal and/or the second signal. A spacing between a center frequency of a first subchannel and a center frequency of a second subchannel is an integer multiple of a spacing between two adjacent second subchannels. A signal bandwidth that corresponds to the first subchannel is less than or equal to a signal bandwidth that corresponds to the second subchannel. The method includes transmitting the transmit signal to a receive end for completing reception of the first signal and the second signal.

Abstract: Embodiments of the present invention disclose a data transmission method, device, and system, are applied to the field of communications, and can improve data transmission efficiency and reduce a time delay. The method includes: acquiring, by a sending device, a time-frequency resource and interleaver information that are to be used by to-be-sent data, where the interleaver information includes a correspondence between an interleaver and a time synchronization code, and there is a one-to-one correspondence between a time synchronization code and an interleaver; selecting a time synchronization code and an interleaver for the to-be-sent data according to the interleaver information; and performing interleaving processing on the to-be-sent data by using the selected interleaver, and sending, to a receiving device on the time-frequency resource, the interleaved to-be-sent data that carries the selected time synchronization code. The embodiments of the present invention are applied to data transmission.

Abstract: Embodiments provide a method and a device for transmitting downlink control information, where the method for transmitting downlink control information includes: determining, by a base station, duration information, where the duration information is used to indicate a duration that downlink control information to be sent from the base station to a user equipment needs to occupy; and sending, by the base station, the duration information to the user equipment, and sending the downlink control information to the user equipment in the duration, so that the user equipment receives the downlink control information according to the duration information.