Scheduling timing design for a tdd system

A user equipment (UE) comprising:

• a receiver to receive respective indications of UL-DL subframe configurations of a scheduling cell and a scheduled cell in a wireless time-division duplex (TDD) system that utilizes cross-carrier scheduling, the respective UL-DL subframe configurations being different from one another;
• and
• a processor coupled with the receiver, the processor to determine a scheduled cell timing configuration based at least in part on an uplink round trip time (RTT) of a hybrid automatic repeat request (HARQ) process that utilizes the UL-DL subframe configuration of the scheduling cell;
• wherein the receiver is further to receive a HARQ signal of the scheduled cell in at least one downlink subframe of the scheduling cell according to the scheduled cell timing configuration.

A system comprising:

• a receiver to receive, at a user equipment (UE), an indication of an uplink/downlink (UL-DL) subframe configuration of a scheduling cell in a wireless time-division duplex (TDD) system that utilizes cross-carrier scheduling;
• the receiver further to receive an indication of a UL-DL subframe configuration of a scheduled cell in the wireless TDD system, the UL-DL subframe configuration of the scheduled cell being different from the UL-DL subframe configuration of the scheduling cell;
• and
• a processor to identify a reference UL-DL subframe configuration based at least in part on the UL-DL subframe configurations of the scheduling cell and scheduled cell;
• and
• wherein the receiver is further to receive, from the scheduling cell of an enhanced NodeB (eNB), a hybrid automatic repeat request (HARD) signal of the scheduled cell according to a subframe timing of the reference UL-DL subframe configuration.

An enhanced NodeB (eNB) comprising:

• a processor to:
• determine respective uplink/downlink (UL-DL) subframe configurations of a scheduling cell and a scheduled cell in a wireless time-division duplex (TDD) system that utilizes cross-carrier scheduling, the UL-DL subframe configuration of the scheduled cell being different from the UL-DL subframe configuration of the scheduling cell;
• and
• determine a reference UL-DL subframe configuration based at least in part on the UL-DL subframe configurations of the scheduling cell and the scheduled cell;
• and
• a transmitter to transmit to a user equipment (UE):
• an indication of the UL-DL subframe configuration of the scheduling cell;
• an indication of the UL-DL subframe configuration of the scheduled cell;
• and
• an indication of the reference UL-DL subframe configuration;
• wherein the transmitter is further to transmit a hybrid automatic repeat request (HARQ) signal comprising a positive or negative acknowledgement signal of the scheduled cell in a downlink subframe of the scheduling cell.