Abstract: A memory management method and a memory architecture for transmitting ultra-wideband (UWB) prioritized channel access (PCA) frames are provided. The method comprises the steps of assigning a pre-load queue to each of a plurality of access categories for storing UWB PCA frames to be transmitted, and, when one of the access categories gains transmission opportunity (TXOP), assigning a common area queue to that access category for storing UWB PCA frames to be transmitted. Moreover, when a UWB PCA frame in one of the pre-load queues reaches a predetermined size, the access category corresponding to the pre-load queue starts its backoff state machine in order to gain the TXOP.