Abstract: Embodiments of the present invention relate to the field of communications technologies and provide a method for transmitting system information, an apparatus, and a system, to reduce a delay in obtaining correct system information by a terminal device. One method includes: generating a system information block SIB, and sending the SIB in N time units of a SIB period, wherein a first time unit of the N time units includes a redundancy version number of the SIB that is set to 0, the SIB period comprises T time unit groups, and the T time unit groups comprise TP SIB candidate sending time unit groups, wherein TP?T, each of the T time unit groups comprises A time units for a clear channel assessment (CCA), and each of the TP SIB candidate sending time unit groups comprises r SIB candidate sending time units, and wherein N is a total quantity of SIB candidate sending time units comprised in one or more of the TP SIB candidate sending time unit groups that the CCA is successful, and N?TP×r.

Abstract: This application provides a data transmission method and apparatus. The method includes: determining a first frequency hopping pattern and a second frequency hopping pattern, wherein the first frequency hopping pattern and the second frequency hopping pattern comprises a same index set of N indexes corresponding to N channels; sending, based on the first frequency hopping pattern, data in each time unit of a first time period by using one of the N channels; and sending, based on the second frequency hopping pattern, data in each time unit of a second time period by using one of the N channels, wherein the first period and the second period are consecutive time periods each comprising N time units, each time unit starts and ends at starting times of two adjacent channels.

Abstract: A method includes determining, by a network side device, N fixed channels. The method further includes determining, by the network side device, a first fixed channel from the N fixed channels, sending, by the network side device, a discovery reference signal on the first fixed channel, and performing data transmission on a data channel through frequency hopping. The data channel includes a channel other than the N fixed channels. N is an integer greater than or equal to 2.

Abstract: Embodiments of the present disclosure provide a time service method, a terminal device, and a network device. The method includes: determining, by a terminal device, a first moment of a first downlink message, and determining a second moment of the first downlink message; determining, by the terminal device, a third moment of a first uplink message, and determining a fourth moment of the first uplink message; and determining, by the terminal device, a time offset between the terminal device and the network device based on the first moment, the second moment, the third moment, and the fourth moment. According to the method provided, a time service error is effectively reduced.

Abstract: The present disclosure provides a method, system, and terminal device for data transmission in an unlicensed spectrum, effectively reduce mutual signal interference between different systems while meeting regulation constraints on use of the unlicensed spectrum. The method in the present disclosure includes: at a processing start moment of a terminal device in a current channel occupancy time window of a network device, when remaining duration of the current channel occupancy time window of the network device is greater than or equal to duration for the terminal device to transmit a to-be-sent data packet to the network device, selecting based on a user attribute of the terminal device and from a mapping relationship between a user attribute and a transmission mode; and sending the to-be-sent data packet to the network device in the selected transmission mode.

Abstract: Embodiments of this application disclose receiving, by a base station, a random access request message; sending a random access response message based on the preset frame structure; receiving an RRC connection request message based on the preset frame structure; and sending a contention resolution message based on the preset frame structure, to complete random access of a terminal, where the preset frame structure includes a first time-frequency resource segment and a second time-frequency resource segment; the first time-frequency resource segment includes a time-frequency resource used to send a synchronization signal and a PBCH, and further includes an idle time-frequency resource and/or an uplink time-frequency resource used to send uplink information; the second time-frequency resource segment includes an integer quantity of data frames with same duration; and duration of the first time-frequency resource segment is equal to duration of any data frame.

Abstract: Embodiments of the present invention relate to the field of communications technologies and provide a method for transmitting system information, an apparatus, and a system, to reduce a delay in obtaining correct system information by a terminal device. One method includes: generating a system information block SIB, and sending the SIB in N time units of a SIB period, wherein a first time unit of the N time units includes a redundancy version number of the SIB that is set to 0, the SIB period comprises T time unit groups, and the T time unit groups comprise TP SIB candidate sending time unit groups, wherein TP?T , each of the T time unit groups comprises A time units for a clear channel assessment (CCA), and each of the TP SIB candidate sending time unit groups comprises r SIB candidate sending time units, and wherein N is a total quantity of SIB candidate sending time units comprised in one or more of the TP SIB candidate sending time unit groups that the CCA is successful, and N?TP×r.

Abstract: Embodiments of this application provide a synchronization signal sending method and apparatus. The method includes: obtaining an initial synchronization sequence, where a spectrum width corresponding to the initial synchronization sequence is greater than a bandwidth of a synchronization channel and is less than a sum of the bandwidth of the synchronization channel and a system protection bandwidth; dividing the initial synchronization sequence into N sub-synchronization sequences; carrying the N sub-synchronization sequences on N time-domain symbols; and sending the N time-domain symbols to a receiving apparatus. According to the synchronization signal sending method provided in the embodiments of this application, a bandwidth loss of a synchronization signal is reduced, and utilization and synchronization performance of a system synchronization bandwidth are improved.

Abstract: This application provides a data transmission method and apparatus. The method includes: determining a first frequency hopping pattern and a second frequency hopping pattern, wherein the first frequency hopping pattern and the second frequency hopping pattern comprises a same index set of N indexes corresponding to N channels; sending, based on the first frequency hopping pattern, data in each time unit of a first time period by using one of the N channels; and sending, based on the second frequency hopping pattern, data in each time unit of a second time period by using one of the N channels, wherein the first period and the second period are consecutive time periods each comprising N time units, each time unit starts and ends at starting times of two adjacent channels.

Abstract: Embodiments of the present application provide a data transmission method, and the method is used for communication between UE and a base station on an unlicensed spectrum. The method includes: sending, by the UE, a data packet to the base station and starting a timer during a current COD of the base station; determining a first end moment of the current COD; pausing the timer at the first end moment; determining a second end moment of an LP in a next COD of the base station; resuming the timer at the second end moment; and receiving, before the resumed timer expires, a response message from the base station. In the embodiments of the present application, the UE suspends the timer at the end moment of the previous COD and resumes the timer at the end moment of the LP of the next COD.

Abstract: A message transmission method and apparatus are provided. The method includes: determining, by a base station in a first sending cycle, a first time unit for sending a first message, where the first sending cycle includes one of the following cycles: a paging cycle or a broadcast cycle, the first message includes one of the following messages: a paging message or a broadcast message, and the first time unit includes one of the following time units: one or more subframes, or one or more slots. When determining, before a start location of the first time unit, that a CCA fails, determining a second time unit(s) for sending the first message; and sending the first message to a terminal device in one or more second time units for sending the first message that are after the first time unit for sending the first message.

Abstract: A method includes determining, by a network side device, N fixed channels. The method further includes determining, by the network side device, a first fixed channel from the N fixed channels, sending, by the network side device, a discovery reference signal on the first fixed channel, and performing data transmission on a data channel through frequency hopping. The data channel includes a channel other than the N fixed channels. N is an integer greater than or equal to 2.

Abstract: This application provides a data transmission method, to help increase a data transmission success rate. The method includes: broadcasting, by a network device, first channel information, where the first channel information is used to indicate a channel state of each of N channels, the channel state is that the channel is available or that the channel is unavailable, and N?1; and determining, by the network device, a channel for frequency hopping transmission based on the channel state of each channel.

Abstract: Embodiments of this application provide a communication method and a communications apparatus. An example method includes: sending an ePDCCH to a terminal, where the ePDCCH carries scheduling information of a SIB; and sending a PDSCH to the terminal based on the scheduling information of the SIB, where the PDSCH carries the SIB.

Abstract: Embodiments of this application provide an anchor channel transmission method and apparatus, and a communications apparatus. According to the method, an anchor channel occupies a lowest frequency or a highest frequency of a system bandwidth, and power boosting is performed on at least the anchor channel. According to technical solutions provided in the embodiments of this application, the anchor channel may occupy the lowest frequency or the highest frequency of the system bandwidth, other anchor channels are adjacent to the anchor channel, and anchor channels in the other anchor channels are adjacent to each other, so that when power boosting is performed on one or more anchor channels, a smallest quantity of RBs lose powers.

Abstract: Embodiments of this application provide methods for detecting or sending a discovery signal, associated base station, and associated user equipment. A method includes: performing, by a base station, first carrier sense on first R subframes of one radio frame in a time sequence in a first discovery signal measurement timing (DMTC) window; and if the first carrier sense succeeds, sending, by the base station, a discovery signal in M consecutive subframes, where M is greater than or equal to 2, and the first subframe of the M consecutive subframes is located in the radio frame in the first DMTC window. The embodiments of this application are used to support enhanced discovery signal transmission by using a new DMTC, so that to implement accessing UE in a weak coverage scenario, thereby ensuring cell coverage performance.

Abstract: A method and an apparatus for scheduling a system information block are disclosed, to increase a probability of obtaining a system information block by a terminal. A network device sends a master information block to the terminal, where the master information block includes DMTC period information; and the terminal receives the master information block, and detects a system information block, at a location of a subframe in a DMTC period. Alternatively, the master information block includes DMTC period information and DMTC time window information, and the terminal detects a system information block, at a location of a subframe in a DMTC period and in a DMTC window size. Alternatively, the master information block includes system information block period information or MF system information block content change indication information, and the terminal determines, based on the system information block period information, whether content of the detected system information block is changed.

Abstract: The present disclosure relates to subframe configuration indication methods and apparatus. One example method includes determining, by a network device, a quantity of downlink symbols included in an (n+N)th subframe, where N is an integer greater than or equal to 2, and n is an integer greater than or equal to 0, and sending, by the network device and in both a control region and a data region of an nth subframe, downlink control information (DCI) through downlink control channels, where the DCI is used to indicate the quantity of downlink symbols included in the (n+N)th subframe.

Abstract: A communication method and an apparatus are provided, where the method includes: determining, by a base station, a pre-configured value; and sending, by the base station, a downlink subframe in a first subframe, where the downlink subframe carries a control format indicator and a physical downlink control channel, the control format indicator is used to indicate a quantity of symbols occupied by the physical downlink control channel, and the base station determines a value of the control format indicator based on the pre-configured value or the quantity of symbols occupied by the physical downlink control channel that needs to be sent in the downlink subframe. In this case, in a WCE scenario, PCFICH coverage enhancement may not be performed any longer, and therefore resource consumption is reduced and impact on PDCCH performance is avoided.

Abstract: Embodiments of the present disclosure provide a time service method, a terminal device, and a network device. The method includes: determining, by a terminal device, a first moment of a first downlink message, and determining a second moment of the first downlink message; determining, by the terminal device, a third moment of a first uplink message, and determining a fourth moment of the first uplink message; and determining, by the terminal device, a time offset between the terminal device and the network device based on the first moment, the second moment, the third moment, and the fourth moment. According to the method provided, a time service error is effectively reduced.