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An Adjustment Algorithm for Bandwidth Grant Interval of UGS Class in IEEE 802.16/WiBro Systems  

Baek, Joo-Young (포항공과대학교 컴퓨터공학과)
Yoon, Jong-Pil (LG전자)
Lee, Jeong-Yoon (포항공과대학교 컴퓨터공학과)
Suh, Young-Joo (포항공과대학교 컴퓨터공학과)
Publication Information
Journal of KIISE:Computing Practices and Letters / v.15, no.5, 2009 , pp. 370-374 More about this Journal
Abstract
In this paper we propose an adjustment algorithm for bandwidth grant interval of UGS class flows the overload status of certain frames occurs due to the pre-defined grant interval mechanism of UGS class. In IEEE 802.16/WiBro systems, UGS class is the highest priority to guaranteed QoS Parameters. However, existing grant interval mechanisms of UGS class do not consider the condition that the grant interval of multiple UGS class flows overlaps with certain frames, and thus it causes the overload status in the system. Therefore, the system cannot be guaranteed QoS for UGS class flows. In this paper, we show the occurrence of the problem through simulation studies and propose an adjustment algorithm to solve the problem. Our simulation results show that there is performance improvement in the proposed algorithm. We expect that the real system in which the proposed scheme is applied can provide more stable QoS services by reducing the delay problem that occurs due to the occurrence of the existing grant interval problem of UGS class.
Keywords
IEEE 802.16/WiBro system; UGS class; Bandwidth Grant Interval; QoS;
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