Method and apparatus for performing hybrid automatic repeat request processes

A computer program product, embodied on a non-transitory computer readable medium, the computer program product configured to control a processor to perform a process, comprising:

• receiving, by a user equipment, at least one of an uplink grant in a specific subframe of a frame and a physical hybrid-ARQ indicator channel transmission, for a physical-uplink-shared-channel transmission or retransmission on a special subframe;
• determining that the uplink grant validates transmitting a physical-uplink-shared-channel transmission on the special subframe, or that the physical hybrid-ARQ indicator channel transmission validates transmitting a physical-uplink-shared-channel retransmission on the special subframe;
• determining transmission parameters for transmitting the physical-uplink-shared-channel transmission or retransmission;
• and
• transmitting the physical-uplink-shared-channel transmission or retransmission on the special subframe.

An apparatus, comprising:

• at least one processor;
• and
• at least one memory including computer program code;
• the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
• transmit at least of an uplink grant in a specific subframe of a frame and a physical hybrid-ARQ indicator channel transmission, for a physical-uplink-shared-channel transmission or retransmission on a special subframe, wherein the uplink grant validates transmitting a physical-uplink-shared-channel transmission, by a user equipment, on the special subframe, or the physical hybrid-ARQ indicator channel transmission validates transmitting a physical-uplink-shared-channel retransmission on the special subframe;
• and
• receive the physical-uplink-shared-channel transmission or retransmission on the special subframe.