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Providing service differentiation in wireless networks has attracted much attention in recent research. Existing studies so far have focused on the design of MAC layer protocols to achieve distributed priority scheduling. While these works have been shown to achieve certain differentiation (higher throughput or lower delay for higher priority packets) at MAC layer, they did not consider the problem of service differentiation from end-to-end perspective. Moreover, these approaches did not present a formalized service differentiation model that quantifies the degree of differentiation, which is critical for service class selection and provision. This paper addresses above problems by introducing a clear service differentiation model, proportional service differentiation, to the domain of wireless network and targeting at providing proportional delay differentiation in wireless LAN.

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