| 摘要 |
The present invention discloses a random access method. The method includes: selecting, from a specified number of access sequences used by a cell in which a terminal is located, any one access sequence as a first access sequence; mapping the first access sequence onto a specified bandwidth according to a preset subcarrier spacing to generate a first random access signal, where the subcarrier spacing is less than 1.25 kHz; sending the random access signal to a base station, so that the base station determines a round-trip transmission delay according to the first access sequence in the random access signal; receiving a timing advance adjustment command sent by the base station, where the timing advance adjustment command carries the round-trip transmission delay; and adjusting a timing advance according to the round-trip transmission delay, and sending a first message to the base station according to the adjusted timing advance so that the base station demodulates the first message and enables the terminal to access a physical random access channel. Embodiments of the present invention can ensure that a terminal at a very long distance can access a physical random access channel. |
