Communication system

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

• a radio resource controller configured to and/or programmed to
• configure, based on a radio resource control (RRC) signaling, a first enhanced physical downlink control channel (EPDCCH) set and a second EPDCCH set for EPDCCH monitoring,
• configure a reception type of the first EPDCCH set and a reception type of the second EPDCCH set with a localized reception type or a distributed reception type, the reception type of the first EPDCCH set and the reception type of the second EPDCCH set being configured with a same reception type;
• a transmitter configured to and/or programmed to transmit an EPDCCH based on the first EPDCCH set and the second EPDCCH set, a first physical uplink control channel (PUCCH) resource offset being configured by the RRC signaling for the first EPDCCH set, and a second PUCCH resource offset being configured by the RRC signaling for the second EPDCCH set;
• and
• a receiver configured to and/or programmed to receive a hybrid automatic repeat request-acknowledgement (HARQ-ACK) for a physical downlink shared channel transmission indicated by a detection of the EPDCCH, the HARQ-ACK being received using a PUCCH resource, wherein
• each of the first EPDCCH set and the second EPDCCH set consists of a plurality of physical resource block pairs,
• in a case that the EPDCCH is in the first EPDCCH set, the PUCCH resource is determined based on at least a lowest enhanced control channel element (ECCE) index used to construct the EPDCCH and the first PUCCH resource offset,
• in a case that the EPDCCH is in the second EPDCCH set, the PUCCH resource is determined based on at least a lowest enhanced control channel element (ECCE) index used to construct the EPDCCH and the second PUCCH resource offset.

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

• configuring, based on a radio resource control (RRC) signaling, a first enhanced physical downlink control channel (EPDCCH) set and a second EPDCCH set for EPDCCH monitoring,
• configuring a transmission type of the first EPDCCH set and a transmission type of the second EPDCCH set with a localized transmission type or a distributed transmission type, the transmission type of the first EPDCCH set and the transmission type of the second EPDCCH set being configured with a same transmission type;
• monitoring a set of EPDCCH candidates based on the first EPDCCH set and the second EPDCCH set, a first physical uplink control channel (PUCCH) resource offset being configured by the RRC signaling, a second PUCCH resource offset being configured by the RRC signaling;
• and
• transmitting a hybrid automatic repeat request-acknowledgement (HARQ-ACK) for a physical downlink shared channel transmission indicated by a detection of an EPDCCH, the HARQ-ACK being transmitted using a PUCCH resource, wherein
• each of the first EPDCCH set and the second EPDCCH set consists of a plurality of physical resource block pairs,
• in a case that the EPDCCH is in the first EPDCCH set, the PUCCH resource is determined based on at least a lowest enhanced control channel element (ECCE) index used to construct the EPDCCH and the first PUCCH resource offset,
• in a case that the EPDCCH is in the second EPDCCH set, the PUCCH resource is determined based on at least a lowest enhanced control channel element (ECCE) index used to construct the EPDCCH and the second PUCCH resource offset.

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

• configuring, based on a radio resource control (RRC) signaling, a first enhanced physical downlink control channel (EPDCCH) set and a second EPDCCH set for EPDCCH monitoring,
• configuring a reception type of the first EPDCCH set and a reception type of the second EPDCCH set with a localized reception type or a distributed reception type, the reception type of the first EPDCCH set and the reception type of the second EPDCCH set being configured with a same reception type;
• transmitting an EPDCCH based on the first EPDCCH set and the second EPDCCH set, a first physical uplink control channel (PUCCH) resource offset being configured by the RRC signaling and a second PUCCH resource offset being configured by the RRC signaling;
• and
• receiving a hybrid automatic repeat request-acknowledgement (HARQ-ACK) for a physical downlink shared channel transmission indicated by a detection of the EPDCCH, the HARQ-ACK being received using a PUCCH resource, wherein
• each of the first EPDCCH set and the second EPDCCH set consists of a plurality of physical resource block pairs,
• in a case that the EPDCCH is in the first EPDCCH set, the PUCCH resource is determined based on at least a lowest enhanced control channel element (ECCE) index used to construct the EPDCCH and the first PUCCH resource offset,
• in a case that the EPDCCH is in the second EPDCCH set, the PUCCH resource is determined based on at least a lowest enhanced control channel element (ECCE) index used to construct the EPDCCH and the second PUCCH resource offset.