Wi-Fi Acknowledgment Frames with Duration Indication

The patent applies preliminary action by including duration indication information in the acknowledgment message frame before the actual data transmission duration is needed. This allows receiving devices to pre-calculate and set their Network Allocation Vector (NAV) values, reserving the communication connection for the transmitting device during the upcoming transmission period. By performing this reservation action in advance through the ACK frame, the system eliminates the need for re-contention after transmission, thereby reducing transmission delays without significantly complicating the message structure.

The patent applies dynamics by making the transport connection occupation duration variable rather than fixed. The duration indication information in the acknowledgment message is dynamically determined based on the actual reception status of data frames. When data frames are successfully received, the duration can be set to a smaller value; when retransmission is needed, the duration is extended accordingly. This dynamic adjustment mechanism allows the system to optimize resource allocation according to actual transmission needs, reducing resource wastage while managing complexity through standardized duration determination rules.

The patent applies segmentation by dividing the acknowledgment message frame into distinct functional fields, including a specifically designated duration indication information field. This segmentation allows receiving devices to efficiently parse and extract only the necessary duration information without processing the entire message structure. The separated field structure enables selective processing where devices can quickly identify and utilize the duration indication for NAV calculation while ignoring other parts of the message, thereby improving transmission efficiency while minimizing the increase in processing complexity.