ACK/NACK Resource Allocation for HARQ in Mobile Systems

The patent applies local quality by allocating different numbers of DFT input indexes and orthogonal codes to different layers. Specifically, higher layers are allocated more resources (e.g., 16 DFT input indexes and 16 orthogonal codes) while lower layers receive fewer resources (e.g., 8 DFT input indexes and 8 orthogonal codes). This differentiated resource allocation optimizes reception capability for each layer based on its specific requirements, improving overall system efficiency while reducing wasted resources.

The patent implements dynamics by varying the number of repetition times for ACK/NACK transmission based on the layer. Higher layers are transmitted more times (e.g., 3 repetitions) while lower layers are transmitted fewer times (e.g., 2 repetitions). This dynamic adjustment of repetition times according to layer requirements enhances reception reliability for higher layers without unnecessarily increasing complexity across the entire system.

The patent applies parameter changes by systematically varying key parameters (number of DFT input indexes, number of orthogonal codes, and number of repetition times) according to layer hierarchy. Higher layers receive increased parameter values to enhance their reception capability, while lower layers use reduced parameter values. This parameter-based differentiation ensures that resources are allocated efficiently according to actual needs, improving reliability where required without proportionally increasing total resource consumption.