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Owing to the promising ability of saving hardware cost and spectrumresources, integrated sensing and communication (ISAC) is regarded as arevolutionary technology for future sixth-generation (6G) networks. Themono-static ISAC systems considered in most of existing works can only achievelimited sensing performance due to the single observation angle and easilyblocked transmission links, which motivates researchers to investigatecooperative ISAC networks. In order to further improve the degrees of freedom(DoFs) of cooperative ISAC networks, the transmitter-receiver selection, i.e.,base station (BS) mode selection problem, is meaningful to be studied. However,to our best knowledge, this crucial problem has not been extensively studied inexisting works. In this paper, we consider the joint BS mode selection,transmit beamforming, and receive filter designs for cooperative cell-free ISACnetworks, where multi-BSs cooperatively serve communication users and detecttargets. An efficient joint beamforming design algorithm and three differentheuristic BS mode selection methods are proposed to solve the non-convexNP-hard problem. Simulation results demonstrates the advantages of cooperativeISAC networks, the importance of BS mode selection, and the effectiveness ofproposed algorithms.

Cooperative Cell-Free ISAC Networks: Joint BS Mode Selection and Beamforming Design