It should be understood by those skilled in the art that implementation of functions of various units of the signal transmission device in 
In practical applications, functions implemented by various units in the signal transmission device may all be implemented by a central processing unit (CPU), or a micro processor unit (MPU), or a digital signal processor (DSP), or a field programmable gate array (FPGA) or the like located in the signal transmission device.
The transmission unit 91 is configured to send or receive a signal within an STI, where the STI consists of STBs.
The STI is an uplink STI or a downlink STI, and the base station sends the signal over the uplink STI, or receives the signal over the downlink STI.
In the embodiment of the present disclosure, the STI is consisted of a plurality of consecutive or discrete STBs.
The plurality of STBs are repeated sending of one STB, or are consisted of STBs of different content or different send ports.
In the embodiment of the present disclosure, the transmission unit 91 is configured to send one or more uplink access signals in a STB.
The one or more uplink access signals at least include any one of: a CP, a preamble, GT, and a random access message.