Method of user equipment monitoring control information in a multiple node system and user equipment using the method

A User Equipment (UE) for monitoring control information in a wireless communication system, the UE comprising:

• a Radio Frequency (RF) unit configured to transmit and receive radio signals;
• and
• a processor connected to the RF unit, the processor being configured to:
• receive information about a first reference position for a first Enhanced-Physical Control Format Indication Channel (E-PCFICH) from a Base Station (BS),
• wherein the information about the first reference position for the first E-PCFICH indicates a Resource Block (RB) where a first E-PCFICH region is started,
• detect the first E-PCFICH in the RB indicated by the information about the first reference position for the first E-PCFICH,
• obtain information about a second reference position for a second E-PCFICH based on the information about the first reference position,
• wherein the information about the second reference position for the second E-PCFICH indicates an RB where a second E-PCFICH region is started, and
• wherein each of the first E-PCFICH and the second E-PCFICH is a control channel comprising information about a size of a frequency domain for an Enhanced-Physical Downlink Control Channel (E-PDCCH) for demodulating the control information by using a UE-specific Reference Signal (URS),
• detect the second E-PCFICH in the RB indicated by the information about the second reference position for the second E-PCFICH, and
• receive information related to a total number of a plurality of E-PCFICHs when the plurality of E-PCFICHs is multiplexed within one RB,
• wherein the information related to the total number of the plurality of E-PCFICHs is signaled when the plurality of E-PCFICHs is multiplexed within the one RB,
• wherein, when the received information indicates that one E-PCFICH is positioned within one of the E-PCFICH regions, all of three resource element groups (REGs) are allocated to the one E-PCFICH,
• wherein, when the received information indicates that two E-PCFICHs are positioned within one of the E-PCFICH regions, a first, a third, a fifth number of REGs are allocated to a first number of E-PCFICHs, and a second, a fourth, a sixth number of REGs are allocated to a second number of E-PCFICHs, and
• wherein, when the received information indicates that three E-PCFICHs are positioned within one of the E-PCFICH regions, a first, a fourth, a seventh number of REGs are allocated to a first number of E-PCFICHs, and a second, a fifth, an eighth number of REGs are allocated to a second number of E-PCFICHs, and a third, a sixth, an ninth number of REGs are allocated to a third number of E-PCFICHs.