As shown in FIG. 19, the processor 1901 is sometimes referred to as a controller or control, which may include a microprocessor or other processor devices and/or logic devices, and the processor 1901 receives input and controls operations of every component of the UE 1900.

In an embodiment, the memory 1902 may be, for example, one or more of a buffer memory, a flash memory, a hard drive, a mobile medium, a volatile memory, a nonvolatile memory, or other suitable devices, which may store various information, and furthermore, store programs executing related information. And the processor 1901 may execute programs stored in the memory 1902, so as to realize information storage or processing, etc. Functions of other parts are similar to those of the related art, which shall not be described herein any further. The parts of the UE 1900 may be realized by specific hardware, firmware, software, or any combination thereof, without departing from the scope of the present disclosure.

With the UE of this embodiment, normal random access of the UE may be ensured, and interference to other UEs may be reduced.

This embodiment provides a communication system, including the network device as described in Embodiment 4 and the UE as described in Embodiment 6.