Won Jin Yoon , Hye Kyung Lee , Min Young Chung , Tae Jin Lee , Hyun Seung Choo

The KIPS Transactions:PartC, Vol. 14, No. 4, pp. 349-358, Aug. 2007
10.3745/KIPSTC.2007.14.4.349,   PDF Download:

Abstract

Ethernet Passive Optical Network (EPON), which is one of PON technologies for realizing FTTx (Fiber-To-The-Curb/Home/Office), can cost-effectively construct optical access networks. In addition, EPON can provide high transmission rate up to 10Gbps and it is compatible with existing customer devices equipped with Ethernet card. To effectively control frame transmission from ONUs to OLT, EPON can use Multi-Point Control Protocol (MPCP) with additional control functions in addition to Media Access Control (MAC) protocol function. For EPON, many researches on intra- and inter-ONU scheduling algorithms have been performed. Among the inter-ONU scheduling algorithms, IPS (Interleaved Polling with Stop) based on polling scheme is efficient because OLT assigns available time portion to each ONU given the request information from all ONUs. Since the IPS needs an idle time period on uplink between two consecutive frame transmission periods, it wastes time without frame transmissions. In this paper, we propose a dynamic bandwidth allocation algorithm to increase the channel utilization on uplink and evaluate its performance using simulations. The simulation results show that the proposed Two-phase Cycle Danamic Bandwidth Allocation (TCDBA) algorithm improves the throughput about 15%, compared with the IPS and Fast Gate Dynamic Bandwidth Allocation (FGDBA). Also, the average transmission time of the proposed algorithm is lower than those of other schemes.

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