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This paper proposes a unique discovery signal as an enabler of Peer-To-Peer (P2P) communication which overlays a cellular network and shares its resources. Applying P2P communication to cellular network has two key issues: conventional ad hoc P2P connections may be unstable since stringent resource and interference coordination is usually difficult to achieve for ad hoc P2P communications; The large overhead required by P2P communication may offset its gain. The authors solve these two issues by using a special discovery signal to aid cellular network-supervised resource sharing and interference management between cellular and P2P connections. The discovery signal, which facilitates efficient neighbor discovery in a cellular system, consists of un-modulated tones transmitted on a sequence of OFDM symbols.
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