Uplink information transmission method, terminal apparatus, and access network apparatus

Provided in embodiments of the present invention are an uplink information transmission method, terminal apparatus, and access network apparatus. The method comprises: a terminal apparatus acquires instruction information for sending uplink information in a first symbol set of a target carrier; and the terminal apparatus sends, during a second duration in a period occupied by the first symbol set, uplink information, wherein the second duration is a duration within the period occupied by the first symbol set excluding a first duration, and is a duration within which the terminal apparatus is allowed to access a channel of the target carrier to send the uplink information.