A method of determining almost-blank subframe -ABS- information in a heterogeneous network -HetNet- (100/200) including a macro cell and one or more small cells underlaid with respect to the macro cell, the method not using an X2 interface between the macro cell and the one or more small cells and comprising: obtaining, at a first base station -BS- (110B/192A) of a first one of the one or more small cells, almost-blank subframe -ABS- information of the macro cell based on at least one of transmissions of the macro cell, transmissions of a UE attached to the first small cell and sharing by a second BS of the one or more small cells, the obtaining ABS information based on the transmissions of the macro cell including: synchronizing the first BS with the transmissions of the macro cell, analyzing the transmissions of the macro cell based on the synchronization, obtaining the ABS information based on the analysis; the obtaining information based on the transmissions of the UE or on the sharing by a second BS of the one or more small cells including: receiving a macro cell information message from at least one of the UE and a second BS of the one or more small cells, the macro cell information message including the ABS information; wherein the analyzing the transmissions of the macro cell based on the synchronization includes: receiving a plurality of subframes from the macro cell, and determining, for each received subframe, power levels of one or more reference signal physical resource blocks -PRBs- of the subframe and power levels of one or more non-reference signal PRBs of the subframe; wherein the analyzing the transmissions of the macro cell based on the synchronization further includes performing a comparison operation based on the power levels of the one or more reference signal PRBs and the power levels of the one or more non-reference signal PRBs determined for each of the subframes, estimating, based on the comparison operation, which of the plurality of subframes are being used for transmission by the macro cell and which subframes are being blanked by the macro cell, and determining the ABS information of the macro cell based on the estimating. obtaining, at a first base station -BS- (110B/192A) of a first one of the one or more small cells, almost-blank subframe -ABS- information of the macro cell based on at least one of transmissions of the macro cell, transmissions of a UE attached to the first small cell and sharing by a second BS of the one or more small cells, the obtaining ABS information based on the transmissions of the macro cell including: synchronizing the first BS with the transmissions of the macro cell, analyzing the transmissions of the macro cell based on the synchronization, obtaining the ABS information based on the analysis; synchronizing the first BS with the transmissions of the macro cell, analyzing the transmissions of the macro cell based on the synchronization, obtaining the ABS information based on the analysis; the obtaining information based on the transmissions of the UE or on the sharing by a second BS of the one or more small cells including: receiving a macro cell information message from at least one of the UE and a second BS of the one or more small cells, the macro cell information message including the ABS information; wherein the analyzing the transmissions of the macro cell based on the synchronization includes: receiving a plurality of subframes from the macro cell, and determining, for each received subframe, power levels of one or more reference signal physical resource blocks -PRBs- of the subframe and power levels of one or more non-reference signal PRBs of the subframe; wherein the analyzing the transmissions of the macro cell based on the synchronization further includes performing a comparison operation based on the power levels of the one or more reference signal PRBs and the power levels of the one or more non-reference signal PRBs determined for each of the subframes, estimating, based on the comparison operation, which of the plurality of subframes are being used for transmission by the macro cell and which subframes are being blanked by the macro cell, and determining the ABS information of the macro cell based on the estimating. receiving a macro cell information message from at least one of the UE and a second BS of the one or more small cells, the macro cell information message including the ABS information; wherein the analyzing the transmissions of the macro cell based on the synchronization includes: receiving a plurality of subframes from the macro cell, and determining, for each received subframe, power levels of one or more reference signal physical resource blocks -PRBs- of the subframe and power levels of one or more non-reference signal PRBs of the subframe; wherein the analyzing the transmissions of the macro cell based on the synchronization further includes performing a comparison operation based on the power levels of the one or more reference signal PRBs and the power levels of the one or more non-reference signal PRBs determined for each of the subframes, estimating, based on the comparison operation, which of the plurality of subframes are being used for transmission by the macro cell and which subframes are being blanked by the macro cell, and determining the ABS information of the macro cell based on the estimating.