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The paper proposes a modification to the strict priority scheduler, to guarantee the Quality of Service (QoS) of a network with variable and undetermined bandwidth capacity. The proposed modifications make it possible to accomplish QoS along the path. The presented solution allows providing the minimum guaranteed transmission rates for all active flows with the respect to their priorities and to provide the fair share of the additional bandwidth. The scheduler also rejects flows, for which the minimum rate requirements exceed the available bandwidth. Moreover, a simple algorithm for mapping the WiMAX traffic classes to the strict n-priority scheduler bands is described. This allows providing WiFi - WiMAX internetworking with the QoS support.
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