Method, system and device for allocating and identifying physical downlink control channel (PDCCH)

The embodiment of the invention provides a method, system and device for allocating and identifying physical downlink control channel (PDCCH), belonging to the technical field of wireless communication. The invention is used for allocating PDCCH resource according to a PDCCH enhanced scheme. The method comprises the following steps: a physical downlink shared channel (PDSCH) transmission mode is notified to user equipment (UE) by the network side; and corresponding PDCCH resource is allocated to the UE by the network side based on the PDSCH transmission mode corresponding to the UE, wherein the PDCCH resource includes a Legacy PDCCH domain and an Enhanced PDCCH domain. According to the invention, the PDCCH resource can be allocated according to the PDCCH enhanced scheme, so as to send and receive the PDCCH effectively.