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This paper proposes a new User-Differentiation based Resource Allocation (UDRA) scheme for OFDMA downlink systems. The UDRA scheme can strike a good balance between Quality-of-Service (QoS) requirement guarantee and system throughput enhancement, whereas conventional schemes cannot explicitly and accurately control this tradeoff. The UDRA scheme first performs a utility-based resource allocation algorithm for urgent users to fulfill QoS requirement, then it performs a maximum-sum-rate resource allocation algorithm for regular users to enhance system throughput. To achieve the balance between QoS guarantee and throughput enhancement, the UDRA scheme further designs a Fuzzy Logic User Identifier (FLUI) to intelligently differentiate users from urgent and regular.
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