Apparatus, system and method of wireless communication according to a hybrid automatic repeat request (HARQ) scheme

A wireless communication device configured for communication according to a Hybrid Automatic Repeat Request (HARQ) scheme, the wireless communication device comprising:

• a memory to store instructions of an operating system of the wireless communication device;
• a processor to execute the instructions of the operating system of the wireless communication device;
• one or more antennas;
• a radio connected to the one or more antennas to communicate over a wireless communication medium;
• a HARQ buffer configured to buffer compressed Log Likelihood Ratio (LLR) values corresponding to an unsuccessfully-decoded transmission of a data block, a bit size of the HARQ buffer is equal to or less than 2.5 times a supported HARQ receive (Rx) size, which is reported to a transmitter of the data block;
• and
• a decoder configured to decode a retransmission of the data block according to the HARQ scheme based on combined LLR values, which are based on the compressed LLR values and on LLR values corresponding to the retransmission of the data block, wherein a HARQ gain of decoding the retransmission of the data block based on the combined LLR values is at least 2 Decibel (dB) for an Additive White Gaussian Noise (AWGN) channel.