The session keys protect communications between the WLAN access point (140) and the WLAN device (130).

会话密钥保护WLAN接入点（140）与WLAN设备 （130）之间的通信。

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For communication between a WLAN station and an access point, frame acknowledgments decrease the bandwidth, as do the number of other stations using the same access point.

对于WLAN工作站与接入点之间的通信，帧确认会降低带宽，使用同一接入点的其他工作站的数量也会带来同样影响。

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A central controller of the WLAN generates a schedule for transmission at different power levels, and each access point varies its transmission power level based on the schedule.

所述WLAN的中央控制器生成针对在不同功率级下进行传送的调度表，并且每一个接入点基于该调度表改变其传传输功率级。

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