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Two-Level Downlink Scheduling for Real-Time Multimedia Services in LTE Networks

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5 Author(s)
Giuseppe Piro ; DEE-Dipt. di Elettron. ed Elettrotec., Politec. di Bari, Bari, Italy ; Luigi Alfredo Grieco ; Gennaro Boggia ; Rossella Fortuna
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Long-term evolution represents an emerging technology that promises a broadband and ubiquitous Internet access. But several aspects have to be considered for providing effective multimedia services to mobile users. In particular, in this work, we consider the design of a quality-of-service (QoS) aware packet scheduler for real-time downlink communications. To this aim, a novel two-level scheduling algorithm is conceived. The upper level exploits an innovative approach based on discrete-time linear control theory. Instead, at the lower level, a proportional fair scheduler has been properly tailored to our purposes. The performance and the complexity of the proposed scheme have been evaluated both theoretically and by using simulations. A comparison with recently proposed scheduling strategies has been also presented, considering several network conditions and real-time multimedia flows. Particular attention has been devoted to the evaluation of the quality-of-experience (QoE) provided to end users. Results have clearly shown that the proposed approach is able to greatly outperform the existing ones especially in the presence of real-time video flows.

Published in:

IEEE Transactions on Multimedia  (Volume:13 ,  Issue: 5 )