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http://dx.doi.org/10.7840/KICS.2012.37.7B.489

Bandwidth Allocation Algorithm for Improving QoS in EPON with Sleep Mode  

Yang, Won-Hyuk (전북대학교 컴퓨터공학과)
Jeong, Jin-Hyo (전북대학교 컴퓨터공학과)
Kim, Young-Chon (전북대학교 IT정보공학부 스마트그리드연구센터)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.37, no.7B, 2012 , pp. 489-498 More about this Journal
Abstract
Recently, as the interest in Green IT is exponentially increased, EPON with sleep mode has been studied to reduce energy consumption in access network. In oder to guarantee cyclic sleep for ONU(Optical Network Units), EPON with sleep mode transmits upstream and downstream data at the same time. However, since conventional algorithms for sleep mode in EPON allocate bandwidth to each ONU according to upstream bandwidth request, the QoS of downstream data is not guaranteed when the offered load of OLT is larger than that of ONU. In this paper, we propose a bandwidth allocation algorithm for improving QoS in EPON with sleep mode. The proposed algorithm compares its size with an upstream request of ONU when a downstream buffer in the OLT exceeds a QoS threshold. And then it allocates selectively a bandwidth that satisfies the required QoS between the bandwidth request of ONU and OLT. Therefore, the proposed algorithm can save energy through cyclic sleep of ONUs while guaranteeing the QoS of up/downstream data. In order to evaluate the proposed algorithm, we perform simulation in terms of total sleep time of ONUs, queueing delay between OLT and ONU, and the utilization of allocated bandwidth at OLT through OPNET.
Keywords
EPON; Energy efficiency; Sleep mode; Bandwidth allocation;
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