A method, in a base station of a communication network, of performing resource element mapping of an ePDCCH for respective user equipments served by the base station, wherein the method comprises the steps of: a. determining resource element mapping patterns for the respective user equipments, and performing the resource element mapping based upon the determined resource element mapping patterns, wherein said determining of the resource element mapping patterns comprises performing the resource element mapping for the ePDCCH by excluding resource elements corresponding to a legacy signal; and b. sending information about the resource element mapping patterns determined for the respective user equipments and a downlink control signaling to the respective user equipments, wherein when the legacy signal is a location reference signal or a channel status information reference signal, said step of performing the resource element mapping of step a, based on the resource element mapping pattern determined for a user equipment configured without the legacy signal among the respective user equipements, comprises performing the resource element mapping for the ePDCCH by excluding the resource elements corresponding to the legacy signal, wherein the step b further comprises: when the legacy signal is the location reference signal, notifying the user equipment configured without the legacy signal of information about a sub-frame in which the location reference signal is present; and when the legacy signal is the channel status information reference signal, notifying the user equipment configured without the legacy signal of information about a sub-frame in which the channel status information reference signal is present and resource elements occupied by the channel status information reference signal. a. determining resource element mapping patterns for the respective user equipments, and performing the resource element mapping based upon the determined resource element mapping patterns, wherein said determining of the resource element mapping patterns comprises performing the resource element mapping for the ePDCCH by excluding resource elements corresponding to a legacy signal; and b. sending information about the resource element mapping patterns determined for the respective user equipments and a downlink control signaling to the respective user equipments, wherein when the legacy signal is a location reference signal or a channel status information reference signal, said step of performing the resource element mapping of step a, based on the resource element mapping pattern determined for a user equipment configured without the legacy signal among the respective user equipements, comprises performing the resource element mapping for the ePDCCH by excluding the resource elements corresponding to the legacy signal, wherein the step b further comprises: when the legacy signal is the location reference signal, notifying the user equipment configured without the legacy signal of information about a sub-frame in which the location reference signal is present; and when the legacy signal is the channel status information reference signal, notifying the user equipment configured without the legacy signal of information about a sub-frame in which the channel status information reference signal is present and resource elements occupied by the channel status information reference signal. when the legacy signal is the location reference signal, notifying the user equipment configured without the legacy signal of information about a sub-frame in which the location reference signal is present; and when the legacy signal is the channel status information reference signal, notifying the user equipment configured without the legacy signal of information about a sub-frame in which the channel status information reference signal is present and resource elements occupied by the channel status information reference signal.