Mobile station apparatus, base station apparatus, communication method and integrated circuit

A base station apparatus configured to communicate with a terminal apparatus, the base station apparatus comprising:

• an Enhanced Physical Downlink Control CHannel (EPDCCH) generator configured to and/or programmed to map an EPDCCH to an EPDCCH candidate in either a first EPDCCH set or a second EPDCCH set, the first EPDCCH set and the second EPDCCH set being determined according to a Radio Resource Control (RRC) signaling,
• the EPDCCH candidate in either the first EPDCCH set or the second EPDCCH set is determined at least on a basis of a number of resource elements satisfying a predetermined criteria in one physical resource block pair which is configured for possible EPDCCH transmission of the first EPDCCH set.

A communication method of a terminal apparatus which is configured to communicate with a base station apparatus, the communication method comprising:

• monitoring EPDCCH candidates in each of a first EPDCCH set and a second EPDCCH set, the first EPDCCH set and the second EPDCCH set being determined according to a Radio Resource Control (RRC) signaling, wherein
• the EPDCCH candidates in each of the first EPDCCH set and the second EPDCCH set are determined at least on a basis of a number of resource elements satisfying a predetermined criteria in one physical resource block pair which is configured for possible EPDCCH transmission of the first EPDCCH set.

A communication method of a base station apparatus which is configured to communicate with a terminal apparatus, the communication method comprising:

• mapping an EPDCCH to an EPDCCH candidate in either a first EPDCCH set or a second EPDCCH set, the first EPDCCH set and the second EPDCCH set being determined according to a Radio Resource Control (RRC) signaling,
• the EPDCCH candidate in either the first EPDCCH set or the second EPDCCH set is determined at least on a basis of a number of resource elements satisfying a predetermined criteria in one physical resource block pair which is configured for possible EPDCCH transmission of the first EPDCCH set.