Journal of Information Technology & Software Engineering
Open Access

Semi-persistent packet scheduling with fairness awareness for LTE downlink

Global Summit and Expo on Multimedia & Applications

August 10-11, 2015 Birmingham, UK

Yan-Jing Wu

Scientific Tracks Abstracts: J Inform Tech Soft Engg

Abstract :

To support the increasing demand for multiple QoS classes and prevent from starvation of low-priority traffic in LTE
(Long Term Evolution) systems, this paper presents a semi-persistent packet scheduling algorithm with fairness awareness
(SPSF). With the proposed SPSF scheme, all traffics are categorized into GBR (Guaranteed bit-rate) and non-GBR according
to their individual resource types. To improve the spectral efficiency in data, GBR traffic can be re-assigned RBs only at the
beginning of a predefined multiple of frames (a frame = 10 TTIs), while non-GBR traffic can be re-assigned RBs which remain
unmasked after GBR’s RB allocation during each TTI (Transmission Time Interval). Besides, in order to avoid low priority
starvation due to QoS provisioning, the proposed SPSF scheme can allocate each UE initially with its minimum bandwidth
requirement in priority-level order under considering both spectral efficiency and resource sharing fairness. We derive the
minimum bandwidth requirement for GBR traffic in terms of its arrival rate, queue length, and packet delay budget, while that
for non-GBR traffic is expressed in term of its arrival rate, queue length, and packet loss ratio. We evaluate the performance
of the proposed SPSF algorithm via extensive simulations on LTE-Sim by varying the number of UE’s in the system. The
performance metrics include the fairness index, user throughput, packet loss ratio, and packet delay for each class. Compared
to the previously-proposed schedulers, the superiority and effectiveness of our proposed SPSF algorithm are demonstrated
since the SPSF scheme is not only semi-persistent but also fairness-aware.

Biography :

Yan-Jing Wu received PhD degree in Computer Engineering from the Department of Electrical Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan.
She became an Assistant Professor in 2007 and an Associate Professor in 2013 at the Department of Information Technology and Communication, Shih Chien
University, Kaohsiung Campus, Taiwan. Her research interests are in the area of wireless communication networks, with emphasis on resource allocation and
mobility management for multimedia traffic.