Patent ID: 7792028

Claim:
A two-tier call admission control method in an IEEE 802.11 WLAN, used to admit of provision of high quality of service, comprising the following steps: having a single user and an overall system correspond respectively to a first layer testing and a second layer testing; controlling a measurement of a physical layer and a testing of the physical layer to serve as the first layer testing; allowing a plurality of station platforms that only pass the first layer testing to initiate an associated request to the overall system, and then get into the second layer testing; and introducing a buffer time into the second layer testing in order to compensate for a TXOPs (Transmission Opportunity) variation of the station platforms induced by status change of the physical layer wherein the method further comprising a parameter G, which denotes the sum of each of the TXOPS and is defined by: G = ∑ i = 1 k ⁢ ⁢ T × OP i , where k and i are integers; and a parameter SI (service interval) which is defined by SI=min (DB i ), ∀i, where DB denotes a delay bound of a communication throughput, and i is an integer.