Time-Domain Resource Allocation with Bundled DMRS for Multi-Layer MIMO

The patent segments the time domain into bundles of time intervals, where each bundle can contain multiple time intervals. Within each bundle, DMRS signals are transmitted at specific intervals rather than continuously. This segmentation allows the system to support more MIMO layers by organizing DMRS transmissions in a structured temporal pattern, reducing overall overhead while maintaining the ability to serve multiple layers simultaneously.

The patent implements periodic transmission of DMRS signals within each bundle of time intervals. Instead of continuous transmission, DMRS signals are sent periodically at defined intervals within the bundle. This periodic action reduces the total amount of DMRS overhead while still providing sufficient reference signals for channel estimation across multiple MIMO layers, thereby resolving the contradiction between supporting more layers and reducing overhead.

The patent applies local quality by transmitting DMRS signals at different densities in different parts of the time domain. Within each bundle of time intervals, DMRS signals are transmitted more frequently in certain intervals to provide accurate channel estimation, while being omitted in other intervals to reduce overhead. This localized variation in DMRS transmission density allows the system to maintain estimation accuracy where needed while minimizing overall overhead.

The patent uses partial action by transmitting DMRS signals only in specific time intervals within each bundle rather than in all intervals. This partial transmission provides sufficient channel estimation accuracy for the intended purpose while avoiding excessive DMRS overhead. The system transmits DMRS signals partially (in selected intervals) rather than excessively (in all intervals), achieving the optimal balance between accuracy and overhead reduction.