The MRS and the synchronization signal and/or the message signal may use different ports, and the synchronization signal (SS) or the MSG uses a port as identification of a corresponding coarse beam. The MRS also uses a port as identification of a coarse beam or a fine beam. Different MRS ports use different time/frequency domain resources and/or code resources. The MRS and the synchronization signal and/or the message signal may also use the same port, such that either the port is used to identify the coarse beam, or the synchronization signal identifies the coarse beam while the message signal and the MRS identify the fine beam. If the MRS uses the port of the fine beam, and the synchronization signal and/or the message signal uses the port of the coarse beam, a plurality of MRS ports (or fine beams) can form the port (or coarse beam) of the SS or the MSG. From the perspective of coverage space, the coarse beam may be a combination of a plurality of fine beams. As shown in FIG. 2A, the coarse beam carrying the SS or the MSG on the STB3 is a combination of two fine beams carrying an MRS5 and an MRS6. If synchronization signals carried by coarse beams or synchronization signals belonging to different ports are attributed to the same cell, the sequences or indexes of the synchronization signals are completely consistent. It should be specially noted that although the SSs in a STB1, a STB2, . . . , a STBn all belong to the same cell and the sequence numbers or indexes of the synchronization signals (SS) are completely consistent, the ports of the SSs or the coarse beams used for spatially carrying the SSs are different. For example, a coarse beam carrying an SS or an MSG in the STB1 is a combination of two fine beams carrying an MRS1 and an MRS2, and a coarse beam carrying an SS or an MSG in a STB3 is a combination of two fine beams carrying the MRS5 and the MRS6. Therefore, strictly speaking, the synchronization signals in the STB1, the STB2, . . . , the STBn, from the perspective of the terminal, have the same sequence number or index, while the other parts are different. As shown in FIG. 3, seven fine beams and 4 groups of synchronization signal coarse beams all have the same synchronization signal sequence or index, while the MRSs are different, the fine beams are different, and the actual orientations of each group of coarse beams are caused to be different. The reason for using the same synchronization signal sequence or index on the same time/frequency resource is to reduce the selection of the ID of the synchronization signal, avoid great complexity due to excessive blind detection of the initial synchronization, reduce the complexity of the synchronization search, and also avoid more interference brought by an overlapping part among the fine beams. The search for the fine beam may be left to the MRS to complete. In special cases, for example, a plurality of transmit points (TP) exist in a cell, it is possible to configure different synchronization signals for different transmit-receive points (TRP). In addition, MRSs with different polarization directions, and fine beams with the same polarization direction but different orientations use different MRS ports.
