Abstract: This disclosure provides a random access method and a random access apparatus, to reduce complexity of a terminal device. The random access method includes: receiving, by an access network device on a first physical random access channel carrier, a first random access preamble sent by a first terminal device; determining, by the access network device, a first physical downlink control channel carrier in a resource pool of physical downlink control channels based on at least one of the first random access preamble and the first physical random access channel carrier, wherein the resource pool of physical downlink control channels comprises at least one physical downlink control channel carrier; and scheduling, by the access network device on the first physical downlink control channel carrier, downlink control information of a random access response corresponding to the first random access preamble.

Abstract: A channel transmission method and an apparatus are provided. The method includes: receiving, by a terminal device, an indication message sent by the base station, where the indication message carries a transmission mode identifier and a frequency domain resource index; and if a transmission mode corresponding to the transmission mode identifier is non-scheduling transmission, scrambling, by the terminal device, to-be-sent data by using a first RNTI, where the first RNTI is a preset value, or a correspondence exists between the first RNTI and the frequency domain resource index; or if a transmission mode corresponding to the transmission mode identifier is scheduling transmission, scrambling, by the terminal device, to-be-sent data by using a second RNTI.

Abstract: An uplink information sending method and apparatus is provided. The method includes obtaining, by user equipment, downlink control information DCI and downlink data, the DCI carries a portion of uplink scheduling information of the user equipment, the uplink information is used to indicate whether the user equipment receives the downlink data correctly, the portion of the uplink scheduling information is specifically indication information excluding a specific parameter of the user equipment, and the specific parameter includes at least one of an uplink modulation and coding scheme MCS or information used to indicate duration for sending the uplink information. The method also includes sending, by the user equipment, the uplink information according to the portion of the uplink scheduling information and the specific parameter, where the specific parameter is a parameter preset in the user equipment or a parameter received by the user equipment from a system message.

Abstract: A data transmission method in the present application includes: determining, by first UE, a frame structure in a time unit, where the frame structure indicates that N type-1 OFDM symbols and a GP are included in the time unit, and a subcarrier spacing of each type-1 OFDM symbol is ?f1. Therefore, according to the data transmission method and the user equipment in embodiments of the present application, a frame structure in a time unit is determined. The frame structure indicates that N type-1 OFDM symbols and a GP are included in the time unit, and a subcarrier spacing of each type-1 OFDM symbol is ?f1. Therefore, when an NB-IOT system is deployed in an LTE system in an embedded manner, and when NB-IOT UE is sending data, a channel resource of the legacy LTE system can be adequately utilized, and a conflict with a legacy LTE SRS can be avoided.

Abstract: This application provides a communication method and a communications device. The method includes: receiving, by an access network device from a core network device, a first group identifier of a first terminal group and an identifier of a terminal included in the first terminal group; and sending, by the access network device, the first group identifier and a second group identifier of the first terminal group to the terminal included in the first terminal group. The first group identifier and the second group identifier are used to indicate a paging occasion for the first terminal group, and a paging message for the first terminal group is transmitted on a first physical channel. The technical solutions in the embodiments of this application can improve system efficiency.

Abstract: The present disclosure discloses a method for transmitting downlink feedback information, a base station, and a terminal device, so as to ensure that the base station correctly receives the downlink feedback information sent by the terminal device, thereby effectively improving a transmission success rate of the downlink feedback information. In embodiments of the present disclosure, the method includes: sending, by the base station, indication information to the terminal device, where the indication information is used to indicate a target time-frequency resource location, the target time-frequency resource location is a time-frequency resource location at which the terminal device sends the downlink feedback information, and the downlink feedback information is used to feed back a reception status of downlink data that should be received by the terminal device; and receiving, by the base station, the downlink feedback information sent by the terminal device.

Abstract: The present disclosure relates to the field of wireless communications technologies, relates to a signal sending device, a signal receiving device, a symbol timing synchronization method, and a system, and resolves a problem that complexity of symbol timing synchronization performed by a terminal with relatively low crystal oscillator accuracy is high. 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.

Abstract: The present disclosure relates to SFN indication methods, terminal devices, and positioning servers and systems. One example method includes obtaining an SFN offset indication parameter of a cell i, sending the SFN offset indication parameter of the cell i to a terminal device, receiving the SFN offset indication parameter of the cell i from the positioning server, obtaining a frame number of a radio frame n of a cell j, and determining a phase rotation parameter of the cell i based on the frame number of the radio frame n of the cell j and the SFN offset indication parameter of the cell i, or obtaining a sequence initialization factor used by a narrowband positioning reference signal (NPRS) on a radio frame m of the cell i, and obtaining the NPRS on the radio frame m of the cell i based on the sequence initialization factor.

Abstract: A data transmission method in the present application includes: determining, by first UE, a frame structure in a time unit, where the frame structure indicates that N type-1 OFDM symbols and a GP are included in the time unit, and a subcarrier spacing of each type-1 OFDM symbol is ?f1. Therefore, according to the data transmission method and the user equipment in embodiments of the present application, a frame structure in a time unit is determined. The frame structure indicates that N type-1 OFDM symbols and a GP are included in the time unit, and a subcarrier spacing of each type-1 OFDM symbol is ?f1. Therefore, when an NB-IOT system is deployed in an LTE system in an embedded manner, and when NB-IOT UE is sending data, a channel resource of the legacy LTE system can be adequately utilized, and a conflict with a legacy LTE SRS can be avoided.

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 disclosure discloses a method for transmitting downlink feedback information, a base station, and a terminal device, so as to ensure that the base station correctly receives the downlink feedback information sent by the terminal device, thereby effectively improving a transmission success rate of the downlink feedback information. In embodiments of the present disclosure, the method includes: sending, by the base station, indication information to the terminal device, where the indication information is used to indicate a target time-frequency resource location, the target time-frequency resource location is a time-frequency resource location at which the terminal device sends the downlink feedback information, and the downlink feedback information is used to feed back a reception status of downlink data that should be received by the terminal device; and receiving, by the base station, the downlink feedback information sent by the terminal device.

Abstract: Embodiments of the present disclosure provide a random access method, a terminal, and a base station. The method includes: receiving, by a terminal (UE), configuration information of random access resources from a base station, where the configuration information of the random access resource includes: configuration information of a first random access resource received from the base station using a system broadcast and configuration information of a second random access resource received from the base station by using downlink control information (DCI); selecting, by the UE, a random access resource from the first random access resource and the second random access resource according to a random access rule and the configuration information of the random access resources; and initiating, by the UE, random access according to the selected random access resource.

Abstract: An embodiment of the present invention discloses a signal sending method, a signal receiving method, a terminal device, a base station, and a system, to ensure that a signal has a sufficiently large capacity when a PAPR is low, and reduce power consumption of the terminal device. The method in embodiments of the present invention includes: generating, by the terminal device, a first signal; performing, by the terminal device, code division processing on the first signal using a target code division sequence selected from a code division sequence set, to generate a second signal, where any two code division sequences in the code division sequence set meet orthogonality and shift orthogonality; and sending, by the terminal device, the second signal to the base station at a corresponding time-frequency resource location.

Abstract: The present disclosure relates to the field of mobile communication, and in particular, to frequency determining technologies in the field of wireless communication. In a frequency determining method, a base station determines a frequency according to different modes, so that an interval between the frequency and a channel raster is not greater than a particular threshold. Corresponding frequencies are determined by setting different thresholds. According to the technical solutions provided in this application, user equipment may determine, in different modes, a corresponding frequency resource to communicate with a base station.

Abstract: Embodiments of this application provide a method for transmitting positioning assistance data and a device. The method includes: receiving, by a network device, at least one positioning assistance data message sent by a positioning server, where the at least one positioning assistance data message is used to carry positioning assistance data; and broadcasting, by the network device, a system message to a terminal device, where the system message is used by the terminal device to obtain the positioning assistance data. According to the embodiments of this application, the network device broadcasts the system message to broadcast the positioning assistance data.

Abstract: The present disclosure relates to channel transmission methods, base stations, and terminal devices. One example method includes receiving a first channel from a network device, determining a frame structure used between the network device and a terminal device according to relationship between a transmission parameter set of the first channel and the frame structure, and communicating with the network device according to the frame structure.

Abstract: Embodiments of the present application disclose a random access method, a base station, and a terminal device. The terminal device receives random access configuration information from a base station, and determines a random access channel, a base frequency, and at least two frequency hopping intervals according to the random access configuration information. The terminal device sends, over the random access channel, random access signals to the base station using frequencies determined according to the base frequency and the N frequency hopping intervals. The terminal device may send the random access signals over the random access channel to the base station according to the base frequency the frequency hopping intervals and a frequency hopping pattern.

Abstract: A channel transmission method, a base station, and a terminal device are provided. In one example method, a base station determines a communication mode to be used between the base station and a terminal device. The base station determines a transmission parameter set of a first channel according to the determined communication mode. The communication mode corresponds to the transmission parameter set of the first channel. The base station transmits information associated with the first channel to the terminal device.

Abstract: Embodiments of this application provide a method for transmitting positioning assistance data and a device. The method includes: receiving, by a network device, at least one positioning assistance data message sent by a positioning server, where the at least one positioning assistance data message is used to carry positioning assistance data; and broadcasting, by the network device, a system message to a terminal device, where the system message is used by the terminal device to obtain the positioning assistance data. According to the embodiments of this application, the network device broadcasts the system message to broadcast the positioning assistance data. In this way, a problem of low efficiency of transmitting existing centralized positioning assistance data can be resolved, and a problem in the prior art that a positioning server needs to perform signaling communication with each terminal device in a unicast transmission scenario can be avoided, thereby reducing signaling overheads.

Abstract: A HARQ-ACK feedback information transmission method includes: obtaining, by a terminal device, downlink HARQ-ACK feedback information for each of a plurality of HARQ processes; and transmitting, by the terminal device, the plurality of pieces of downlink HARQ-ACK feedback information for the plurality of HARQ processes on a same time-frequency resource simultaneously. According to the solution provided in embodiments of this application, the downlink HARQ-ACK feedback information for the plurality of HARQ processes is transmitted on the same time-frequency resource simultaneously.