Next, considering a frequency interval between a carrier separately transmitted by the low power node and a CoMP carrier, a height of frequency point, a distance between a terminal and the low power node, historical statistics and other factors, a coordination downlink path loss f(PL_LPN^dB) occurring when the low power node transmits a downlink signal in a CoMP transmission mode may be estimated based on the separate downlink path loss PL_LPN^dB.

Thereafter, an uplink path loss of an uplink signal issued by the user equipment which takes the low power node as the target receiving node (which is referred to as “an uplink path loss of the low power node” hereinafter) may be further estimated based on the coordination downlink path loss f(PL_LPN^dB) of the low power node, for example, according to the characteristic of reciprocity between an uplink channel and a downlink channel.

In a case where the CoMP transmission mode is the single frequency network coordination mode (i.e. the CoMP scenario 4), further estimation of an uplink path loss of the macro base station based on the estimated coordination downlink path loss f(PL_LPN^dB) of the low power node may be performed with the following expression (6):
TxPower(Macro_CRS)^dB?PL_macro^dB+TxPower(LPN_CRS)^dB?f(PL_LPN^db)=10 log 10(RSRP_macro+LPN^Linear(CRS))??(6)
where TxPower(Macro_CRS)^dB indicates transmission power in dB when the macro base station cooperatively transmits a CRS;
PL_macro^dB indicates a path loss of the macro base station in dB;
TxPower(LPN_CRS)^dB indicates transmission power in dB when the LPN (Low Power Node) cooperatively transmits the CRS; and