C12. The SP-ID indication device according to C11, wherein the access request message includes: a DMRS sequence, a DMRS sequence group to which the DMRS sequence belongs corresponding to the quantity of the PSP-IDs to be transmitted by the UE or the DMRS sequence corresponding to the quantity of the PSP-IDs to be transmitted by the UE; and/or indication information indicating the quantity of the PSP-IDs to be transmitted by the UE, the indication information being transmitted through one or more data symbols in the PRACH.

C13. The SP-ID indication device according to C12, wherein the indication information is carried in one or more QPSK symbols of the one or more data symbols in the PRACH, and/or the DMRS sequence is carried in one or more pilot symbols or the one or more data symbols in the PRACH.

C14. The SP-ID indication device according to any one of C11 to C13, further including a selection module configured to select an interlacing unit corresponding to the quantity of the PSP-IDs to be transmitted by the UE in accordance with a predetermined correspondence between an interlacing unit number and the quantity of the PSP-IDs, wherein the transmission module is further configured to transmit the access request message to the access device through the PRACH corresponding to the selected interlacing unit.

C15. The SP-ID indication device according to any one of C11 to C14, wherein the reception module is further configured to receive a random access response message including the indication information about the uplink resources from the access device.

D16. A User Equipment (UE), including the SP-ID indication device according to any one of C11 to C15.