U-APSD Parameter Negotiation for Seamless WLAN Handover

The patent applies preliminary action by establishing a U-APSD parameter negotiation mechanism before handover occurs. The STA and target AP negotiate and establish U-APSD parameters in advance during the association phase, so that when handover occurs, the power saving mechanism can be immediately maintained without disruption. This is evident in the background section which states that the mechanism ensures 'power saving mechanism integrity is guaranteed' after handover, and in the summary which describes how the target AP buffers data according to the negotiated U-APSD parameter.

The patent applies universality by designing the U-APSD parameter negotiation mechanism to work across multiple APs in a unified manner. The same U-APSD parameters negotiated with the first AP are made applicable to the target AP through the handover process. The summary states that 'the second AP may perform the buffer function according to the U-APSD parameter,' indicating that the mechanism provides a universal solution that maintains power saving integrity without requiring completely separate negotiations for each AP.

The patent applies parameter changes by dynamically adjusting the U-APSD parameters based on the handover scenario. The STA and target AP negotiate U-APSD parameters that are optimized for the post-handover state, allowing the target AP to buffer data efficiently while managing latency. The summary mentions that the target AP 'performs the buffer function according to the U-APSD parameter,' indicating that the parameter is specifically configured to balance power saving and latency requirements in the handover context.