Upon the network entry of a client into the network, the BS scans through its frequency list attempting to synchronize with a BS. The BS performs the admission control algorithm to make a decision whether to admit the SS, based on the QoS requirements requested by the SS and the existing resource availability of the BS. If admitted, the BS generates a set of connection and Connection Identifier (CIDs), together with the management and transport connections, to connect with the SS. Three pairs of management connections are established for control packets, and the transport connection is used for data transmission.
Along with the new CIDs, the BS also assigns new service flow identifiers (SFIDs) to the new data flows linked with the station. A service flow (SF) is a unidirectional flow of MAC SDUs between a pair of BS and SS, of which is provided with a particular set of QoS parameters, and a SFID uniquely identifies the service flow.
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