We consider Medium Access Control (MAC) for efficient WLAN, interfacing with networks out there are problems which should be addressed. The devices of such network will connect computers, Telecommunications, Mobile Computing devices and entertainments. Demonstrating reliability in dynamic mobile network provides a strong motivation for proactive and independent scheduling capability MAC in both adhoc and infrastructure WLAN. To this end we propose a reliable collaborative MAC for WLAN, which automatically schedules schemes for channel bandwidth, high throughput and channel allocation. WLAN configured to 4G and 5G PHY Layer speed in dynamic mobile environment to realize high data transfer rate 1Gbps and greater than 1 Gbps, delay sensitive VoIP applications, HDTV and other multimedia applications are going to be simulated. In this paper, we present high efficient MAC protocol and it's associated multi-rate Aggregation and robust scheduling algorithm for WLAN 802.11xx.