In another embodiment, the frequency positions can be determined by the interleaver. The frequency positions of the discovery resource elements in the preceding discovery resource period of the current discovery resource period are interleaved by the interleaver, a mapping relationship is established between the frequency positions of the discovery resource elements in the preceding discovery resource period and the frequency positions of the discovery resource elements in the current discovery resource period according to the result of the interleaving, and the frequency positions of the discovery resource elements for sending device discovery signals in the current resource period are determined according to the frequency positions of the discovery resource elements which send the device discovery signals in the preceding discovery resource period and the mapping relationship.

The interleaver may be an interleaver defined by the LTE system. As shown in FIG. 12a, there are 8 discovery resource elements numbered as 0-7 in the frequency direction in a discovery resource period, and a sequence <1, 5, 3, 7, 0, 4, 2, 6> is obtained after the interleaving of the LTE interleaver, as shown in FIG. 12b. A discovery resource element corresponding to the frequency position which is numbered as 5 in the preceding resource period of the current discovery resource period sends the device discovery signals, and a discovery resource element corresponding to the converted frequency position which is numbered as 5 in the current resource period sends the device discovery signals.

Embodiment 5