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Snowball Scheme: An Alternative Admission Control Scheme for 3GPP ARQ  

Shin, Woo-Cheol (School of Electronics and Computer Engineering, Dankook University)
Park, Jin-Kyung (School of Electronics and Computer Engineering, Dankook University)
Ha, Jun (School of Electronics and Computer Engineering, Dankook University)
Choi, Cheon-Won (School of Electronics and Computer Engineering, Dankook University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.44, no.8, 2007 , pp. 51-61 More about this Journal
Abstract
For provisioning reliable data transmission, the 3GPP RLC specification adopted a selective-repeat ARQ scheme assisted by a window-based admission control scheme. In the 3GPP ARQ, which is a member of the selective-repeat ARQ clan, inheres the reordering problem A long and irregular reordering time results in the degradation of throughput and delay performance, and may incur the overflow of the reordering buffer. Furthermore, the reordering time must be regulated to meet the requirements of some services which are loss-sensitive and delay-sensitive as well. Perceiving the reordering hazard, we propose an alternative, identified as snowball scheme, to the original admission control scheme of the 3GPP ARQ with aiming at deflating the occupancy of the reordering buffer. A unique feature of the snowball scheme is to reject a new DATA PDU if it is non-adjacent to any DATA PDU sojourning at the reordering buffer. Such an intentional rejection apparently reduces the occupancy of the reordering buffer while it may deteriorate the throughput and delay performance. Developing an analytical approximation method, we investigate the effect of snowball scheme on the saturated occupancy and throughput. Also, we, using a simulation method, evaluate the peak occupancy, normalized throughput and average delay in the practical environment. From the simulation results, we reveal that the snowball scheme is able to enhance occupancy performance as well as throughput performance compared with the original admission control scheme of the 3GPP ARQ.
Keywords
3GPP ARQ; admission control; occupancy; throughput; delay;
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