MIMO HARQ Identification During Multiplex-to-Diversity Switching

The patent segments the identification space by dividing process numbers into separate ranges for different transmission modes (MIMO multiplex vs. MIMO diversity). This segmentation prevents overlap between process numbers from different modes, allowing the system to switch modes without causing re-sending errors. The receiver can correctly identify whether a received packet is a re-transmission or new data based on the segmented process number ranges.

The patent applies local quality by assigning different identification characteristics to different transmission scenarios. When the number of streams changes, the system locally adjusts the process number allocation strategy, ensuring that each stream or transmission mode has a unique identification pattern. This prevents identification errors even when stream count varies, maintaining both stability and accurate stream identification.

The patent implements preliminary action by pre-planning and announcing mode change timing to both sender and receiver before the actual mode transition occurs. This allows the system to prepare for mode changes in advance, ensuring that all necessary data is transmitted or acknowledged before the switch, while minimizing actual latency. The receiver can pre-allocate buffers and the sender can pre-clear transmission queues, achieving both completeness and low latency.