Investigating Polling Cycle Time with Waited-Based DBA in GPONs
The Gigabit Passive Optical Network (GPON), have emerged as one of the most promising access network technologies for future last-mile solutions. To prevent data collision and ensure efficient transmission, the point-to-multipoint topology of GPONs requir
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Abstract The Gigabit Passive Optical Network (GPON), have emerged as one of the most promising access network technologies for future last-mile solutions. To prevent data collision and ensure efficient transmission, the point-to-multipoint topology of GPONs requires a time-division media access control (MAC) protocol to allocate the shared resource of a common upstream transmission medium. Therefore, Dynamic Bandwidth Allocation (DBA) is an open and hot topic in the GPON. However, most proposed DBA plans to ignore the impact of the maximum cycle time for Quality of Service (QoS) ensures maximum delay uplink bandwidth utilization, and drop probability in GPON. In this paper, we propose a Waited-based Dynamic Bandwidth Allocation called WDBA which is predict the arriving real time packet based on the proportion of waiting time for multiple services over GPONs. In addition to ensuring the quality of QoS, our work focus on the fundamental problem of trading-off between upstream channel utilization and maximum polling cycle time with different proportion of Traffic Containers (T-CONTs) traffic in a GPON with multiple ONUs and verify the accuracy of the analysis with simulations. Overall, our numerical results indicate that the packet delay, throughput and drop probability performance is better when the polling cycle time is longer; the fairness is better when the polling cycle time is shorter. Keywords DBA · GPON · MAC · Polling cycle time · QoS · WDBA I-S. Hwang (B) Department of Information Communication, Department of Computer Science and Engineering, Yuan-Ze University, Chung-Li 32003, Taiwan e-mail: [email protected] J-Y. Lee and T-J. Yeh Department of Computer Science and Engineering, Yuan-Ze University, Chung-Li 32003, Taiwan e-mail: [email protected] T-J. Yeh e-mail: [email protected] G.-C. Yang et al. (eds.), Transactions on Engineering Technologies, Lecture Notes in Electrical Engineering 275, DOI: 10.1007/978-94-007-7684-5_10, © Springer Science+Business Media Dordrecht 2014
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1 Introduction The Gigabit Passive Optical Networks (GPONs) [1] have been widely considered as the best candidate for next-generation access networks since it represents the high bandwidth, increased flexibility, broad area coverage, higher splitting ratios, and economically viable sharing of the expensive optical links. GPON consists of an optical line terminal (OLT) located at the provider central office (CO) and connect to a number of optical network units (ONUs) at the customer premises by a single splitter/ODN, as illustrated in Fig. 1. Currently, GPON supports several bit rates in both channels such as asymmetric or symmetric combinations, from 155 Mb/s to 2.5 Gb/s. In downstream, The GPON OLT connects all ONUs as a point-to-multipoint (P2MP) architecture, the OLT transmits encrypted user traffics over the shared bandwidth by broadcasting through the 1:N splitter/ODN on a single wavelength (e.g. 1,490 and 1,550 nm). In upstream, a GPON is a multipoint-to-point (MP2P) network. All O
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