TAILIEUCHUNG - QoS Scheduling for Heterogeneous Traffic in OFDMA-based Wireless Systems

The key access technologies in current and next generation wireless systems is OFDMA. Packet scheduling plays an important role in QoS provisioning by providing mechanisms for the resource allocation | QoS Scheduling for Heterogeneous Traffic in OFDMA-based Wireless Systems Youngki Kim Mobile R&D Laboratory KT, Korea Kyuho Son and Song Chong School of EECS KAIST, Korea IEEE GLOBECOM 2009 proceedings. Speaker：Tsung-Yin Lee Outline Introduction Model Description and Problem Formulation Proposed QoS Scheduling Framework Simulation Result Conclusions Introduction the key access technologies in current and next generation wireless systems is OFDMA Packet scheduling plays an important role in QoS provisioning by providing mechanisms for the resource allocation Paper Goal provide QoS guarantee to the real-time traffic in multi-carrier wireless systems utility maximization of the non real-time traffic while providing QoS guarantee to the real-time traffic balance between QoS guarantee and utility maximization in a simple and organized manner Model Description (1/2) Paper denote by S the set of all sub-channels in the system, NRT and NNRT, the set of all real-time (RT) and non real-time (NRT) flows RT flow, VoIP or MPEG, has its own QoS parameters such as maximum latency NRT flow has no explicit QoS parameters Model Description (2/2) In the system, at each slot, the proposed scheduler determines the sub-channel assignment based on each flow’s current channel quality, minimum average throughput and individual packet deadline Only Consider Downlink Problem Formulation Proposed scheduling framework that maximizes the weighted sum rate of non real-time flows while maintaining QoS constraints of real-time flows in each time slot with the equal power allocation assumption Problem Formulation (1/3) the derivative of utility function of flow i U’i(・) is used as a weight μij(t) is the achievable channel capacity when sub-channel j is assigned to flow i at time slot t Problem Formulation (2/3) is the long-term throughput for flow i up to time slot t δij(τ) is the 0-1 indicator of allocating the sub-channel j to the flow i or not OFDMA constraint : .

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