A random access apparatus , comprising: a memory that stores a program; and a processor coupled to the memory and configured to execute the program to: transmit a first random access request at least comprising a preamble, uplink data and a demodulation reference signal to a network device when the preamble is mapped to an uplink data channel resource of the uplink data and a demodulation reference signal port of the demodulation reference signal according to configuration information that is received from the network device or is configured by the network device , transmit a second random access request comprising a preamble but not comprising uplink data and a demodulation reference signal when the preamble is not mapped to a tuple of the uplink data channel resources and the demodulation reference signal ports; and receive a random access response transmitted by the network device ; wherein a plurality of uplink data channel resources are at least configured into a first group and a second group, and one of uplink data channel resources is at least configured with one of the demodulation reference signal ports. a memory that stores a program; and a processor coupled to the memory and configured to execute the program to: transmit a first random access request at least comprising a preamble, uplink data and a demodulation reference signal to a network device when the preamble is mapped to an uplink data channel resource of the uplink data and a demodulation reference signal port of the demodulation reference signal according to configuration information that is received from the network device or is configured by the network device , transmit a second random access request comprising a preamble but not comprising uplink data and a demodulation reference signal when the preamble is not mapped to a tuple of the uplink data channel resources and the demodulation reference signal ports; and receive a random access response transmitted by the network device ; wherein a plurality of uplink data channel resources are at least configured into a first group and a second group, and one of uplink data channel resources is at least configured with one of the demodulation reference signal ports. transmit a first random access request at least comprising a preamble, uplink data and a demodulation reference signal to a network device when the preamble is mapped to an uplink data channel resource of the uplink data and a demodulation reference signal port of the demodulation reference signal according to configuration information that is received from the network device or is configured by the network device , transmit a second random access request comprising a preamble but not comprising uplink data and a demodulation reference signal when the preamble is not mapped to a tuple of the uplink data channel resources and the demodulation reference signal ports; and receive a random access response transmitted by the network device ; wherein a plurality of uplink data channel resources are at least configured into a first group and a second group, and one of uplink data channel resources is at least configured with one of the demodulation reference signal ports. <EOS>