Abstract: A network out-of-synchronization state processing method and apparatus, and a network access method and apparatus are provided. The method includes: if a first network device does not receive, in a first time length after the first network device determines that a terminal is in a network out-of-synchronization state, a measurement message reported by a second network device in a signal coverage area of the first network device, instructing at least one second network device in the signal coverage area of the first network device to send paging signaling to the terminal; and setting a network status of the terminal to a detached state if the first network device determines that in a second time length, no second network device in the signal coverage area of the first network device receives a paging response sent by the terminal, and that the terminal is still in the network out-of-synchronization state.

Abstract: The present application discloses a beam training method and an apparatus, and relates to the field of the communications technologies. The method includes: determining, by a terminal device, to send n pilot sequences to a network device by using n beams in n timeslots within one uplink beam training period, where the n pilot sequences are at least partially different, and n is a positive integer greater than 1; and sending, by the terminal device, the determined n pilot sequences to the network device by using the n beams in the n timeslots within the uplink beam training period. Within the uplink beam training period, the pilot sequences sent by the terminal device by using the n beams in the n timeslots to the network device are not exactly the same.

Abstract: Embodiments of the present application relate to a method and apparatus for implementing high-frequency communication. The method includes: receiving, by a high-frequency base station, a scan request message sent by a base station originally connected to user equipment (UE); sending, by the high-frequency base station, a scan acknowledgment message to the base station originally connected to the UE, receiving, by the high-frequency base station, information about the UE sent by the base station originally connected to the UE; and scanning the UE, by the high-frequency base station, according to the information about the UE, so as to re-establish a high-frequency connection between the UE and the high-frequency base station.

Abstract: Embodiments of the present application relate to the field of communications technologies, and provide a wireless communication method, a device, and a system, so as to cancel or reduce inter-cell interference, to a terminal, between neighboring cells. The method includes: sending, by a terminal, uplink information to a first network side device in a first time period; and receiving, by the terminal in a second time period, downlink information sent by a second network side device, where the first time period and the second time period are a same time period. The embodiments of the present application are used for wireless communication.

Abstract: Embodiments of the present application relate to a method and apparatus for implementing high-frequency communication. The method includes: receiving, by a high-frequency base station, a scan request message sent by a base station originally connected to user equipment (UE); sending, by the high-frequency base station, a scan acknowledgment message to the base station originally connected to the UE, receiving, by the high-frequency base station, information about the UE sent by the base station originally connected to the UE; and scanning the UE, by the high-frequency base station, according to the information about the UE, so as to re-establish a high-frequency connection between the UE and the high-frequency base station.

Abstract: Embodiments of the present invention provide a frame synchronization method and apparatus, which can reduce impact of a carrier frequency offset. In those embodiment, a solution is provided and the solution includes: obtaining a received signal of a receiving antenna; calculating an auto-correlation value of the received signal and determining a time corresponding to the auto-correlation value that is of the received signal and that meets a first preset condition, as an initial estimation time; obtaining a carrier frequency offset estimation value according to the initial estimation time, the received signal, and a frequency offset estimation algorithm, and performing frequency offset compensation on the received signal by using the carrier frequency offset estimation value; calculating a cross-correlation value and an auto-correlation value of the received signal on which the frequency offset compensation has been performed. The embodiments of the present invention are used for frame synchronization.