Dynamic Spectrum
1
Performance Study of Multimedia Services Using Virtual Token Mechanism for Resource Allocation in LTE Networks
Mauricio Iturralde∗ , Tara Ali Yahiya† , Anne Wei‡ and André-Luc Beylot∗ de Toulouse, IRIT/ENSEEIHT Université Paris Sud 11, LRI ‡ CNAM, Laboratoire Cédric {mauricio.iturralde, andre-luc.beylot} @enseeiht.fr tara.ali-yahiya@u-psud.fr, anne.wei@cnam.fr
† ∗ Université
Abstract—The LTE specification provides QoS of multimedia services with fast connectivity, high mobility and security. However, 3GPP specifications have not defined scheduling algorithms to support real time and non-real time application services. In this paper we propose a modified version of M-LWDF and EXP/PF scheduling algorithms based on token mechanism, which provide better performance to real time flows such as video and VoIP in downlink system. By taking the arrival rates of packets to queues into account, the proposed mechanism included in previous scheduling algorithms, can increase remarkably the bitrate for multimedia services. Simulation results show that the proposed modified algorithms can achieve a throughput gain for real time services specially for video traffic. Performance evaluation is conducted in terms of system throughput and packet loss ratio (PLR). Index Terms—Wireless networks, quality of service, performance evaluation, long-term evolution, virtual token.
I. I NTRODUCTION In conjunction with the useful growth of Internet, multimedia and real time services, Long Term Evolution (LTE) technology has been proposed to perform this ambitious task. LTE uses orthogonal frequency division multiple access (ODFMA) in the downlink. OFDMA divides the frequency band into a group of mutually orthogonal subcarriers, thereby improving like this system capabilities by providing high data rates, supporting multi-user diversity and creating resistance to frequency selective fading of radio channels. The quality of service (QoS) of LTE must be satisfied by giving users the optimal
Performance Study of Multimedia Services Using Virtual Token Mechanism for Resource Allocation in LTE Networks
Mauricio Iturralde∗ , Tara Ali Yahiya† , Anne Wei‡ and André-Luc Beylot∗ de Toulouse, IRIT/ENSEEIHT Université Paris Sud 11, LRI ‡ CNAM, Laboratoire Cédric {mauricio.iturralde, andre-luc.beylot} @enseeiht.fr tara.ali-yahiya@u-psud.fr, anne.wei@cnam.fr
† ∗ Université
Abstract—The LTE specification provides QoS of multimedia services with fast connectivity, high mobility and security. However, 3GPP specifications have not defined scheduling algorithms to support real time and non-real time application services. In this paper we propose a modified version of M-LWDF and EXP/PF scheduling algorithms based on token mechanism, which provide better performance to real time flows such as video and VoIP in downlink system. By taking the arrival rates of packets to queues into account, the proposed mechanism included in previous scheduling algorithms, can increase remarkably the bitrate for multimedia services. Simulation results show that the proposed modified algorithms can achieve a throughput gain for real time services specially for video traffic. Performance evaluation is conducted in terms of system throughput and packet loss ratio (PLR). Index Terms—Wireless networks, quality of service, performance evaluation, long-term evolution, virtual token.
I. I NTRODUCTION In conjunction with the useful growth of Internet, multimedia and real time services, Long Term Evolution (LTE) technology has been proposed to perform this ambitious task. LTE uses orthogonal frequency division multiple access (ODFMA) in the downlink. OFDMA divides the frequency band into a group of mutually orthogonal subcarriers, thereby improving like this system capabilities by providing high data rates, supporting multi-user diversity and creating resistance to frequency selective fading of radio channels. The quality of service (QoS) of LTE must be satisfied by giving users the optimal