In accordance with another aspect of the embodiment, the mapping relationships may be: n2=mod(floor((k1*N+n1+B)/K),N) and k2=mod(k1*N+n1+B,K). The meaning of each of the parameters in the mapping relationships is the same as described above and will not be repeated herein; types of parameters which can be adopted by the parameter B may be identical to types of parameters which can be adopted by the parameter A and will not be repeated herein.

In accordance with still another aspect of the embodiment, the mapping relationships may be: mod(k1+M,K) and n2=mod(n1+k1+L,N), herein M and L are integers, and types of parameters adopted by M and L are the same as types of parameters adopted by A and will not be repeated herein.

For example, still assuming that N=3 and K=8, if values of M and N are both 0 and the position of the discovery resource element which sends the device discovery signals in the preceding discovery resource period of the current discovery resource period is identified by a coordinate (1,2), then the coordinate (0,2) of the discovery resource element for sending the device discovery signals in the current discovery resource period can be determined according to the mapping relationships.