Physical uplink control channel (pucch) resource allocation (ra) for a hybrid automatic retransmission re-quest-acknowledge (harq-ack) transmission

A non-transitory computer readable medium encoded with computer executable instructions, which when accessed, cause a machine to perform operations for conditional time division duplex (TDD) physical uplink control channel (PUCCH) resource allocation for a hybrid automatic retransmission re-quest-acknowledge (HARQ-ACK) transmission in a subframe n at a user equipment (UE), comprising:

• detecting a downlink control channel within a prior specified subframe that is received in time before the subframe n;
• determining that the downlink control channel detected within the prior specified subframe is one of a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (EPDCCH);
• and
• selecting one of a legacy PUCCH resource for the HARQ-ACK transmission using a lowest control channel element (CCE) index of the PDCCH when the detected downlink control channel received within the prior specified subframe is the PDCCH or an enhanced PUCCH resource for the HARQ-ACK transmission using a lowest enhanced control channel element (ECCE) index of the EPDCCH when the downlink control channel detected within the prior specified subframe is the EPDCCH.

A user equipment (UE) operable to provide physical uplink control channel (PUCCH) resource allocation in time division duplex (TDD) for a hybrid automatic retransmission re-quest-acknowledge (HARQ-ACK) transmission in a subframe n, having one or more processors configured to:

• identify that a downlink control channel detected within a prior specified subframe is a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (EPDCCH), wherein the prior specified subframe is received in time before the subframe n, using the one or more processors;
• determine a legacy PUCCH resource for the HARQ-ACK transmission using a lowest control channel element (CCE) index of a physical downlink control channel (PDCCH) when the downlink control channel is the PDCCH, using the one or more processors;
• and
• determine an enhanced PUCCH resource for the HARQ-ACK transmission using a lowest enhanced CCE (ECCE) index of the EPDCCH when the downlink control channel type is the EPDCCH, using the one or more processors.