Data transmission via a relay station with ACK/NACK feedback

An apparatus for wireless communication, comprising:

• means for obtaining an indication to operate in an amplify-and-forward (AF) mode or a decode-and-forward (DF) mode by a relay station;
• means for amplifying and forwarding signals by the relay station to support communication between an upstream station and a downstream station if the AF mode is selected;
• means for decoding and forwarding signals by the relay station to support communication between the upstream station and the downstream station if the DF mode is selected;
• means for receiving a signal from the upstream station by the relay station in the DF mode:
• means for sending a negative acknowledgement having a first type (NACK Type 1) to the upstream station if high peak-to-average-power ratio (PAPR) is detected or PAPR decoding fails for the signal;
• and
• means for sending a negative acknowledgement having a second type (NACK Type 2) to the upstream station if channel decoding fails for the signal.

An apparatus for wireless communication, comprising:

• at least one processor configured to obtain an indication to operate in an amplify-and-forward (AF) mode or a decode-and-forward (DF) mode, to amplify and forward signals to support communication between an upstream station and a downstream station if the AF mode is selected, and to decode and forward signals to support communication between the upstream station and the downstream station if the DF mode is selected;
• a receiver configured to receive a signal from the upstream station in the DF mode;
• and
• a transmitter configured to:
• send a negative acknowledgement having a first type (NACK Type 1) to the upstream station if high peak-to-average-power ratio (PAPR) is detected or PAPR decoding fails for the signal;
• and
• send a negative acknowledgement having a second type (NACK Type 2) to the upstream station if channel decoding fails for the signal.

A non-transitory computer-readable medium, comprising code for causing at least one computer to:

• obtain an indication to operate in an amplify-and-forward (AF) mode or a decode-and-forward (DF) mode;
• amplify and forward signals to support communication between an upstream station and a downstream station if the AF mode is selected;
• decode and forward signals to support communication between the upstream station and the downstream station if the DF mode is selected;
• receive a signal from the upstream station in the DF mode;
• send a negative acknowledgement having a first type (NACK Type 1) to the upstream station if high peak-to-average-power ratio (PAPR) is detected or PAPR decoding fails for the signal;
• and
• send a negative acknowledgement having a second type (NACK Type 2) to the upstream station if channel decoding fails for the signal.