Design and Simulation of Dynamic Bandwidth Allocation Code Division Multiple Access Ethernet Passive Optical Network Protocol
Date Issued
2004
Date
2004
Author(s)
CHEN, YING-CHOU
DOI
en-US
Abstract
The capacity of telecommunication backbone networks increased very rapidly in recent years but that of access network changed little. The tremendous growth of Internet traffic has accentuated the severe shortage of access network capacity. The “last mile” (or first mile) still remains the bottleneck between high-capacity local area network (LAN) and the backbone network. Nowadays, the most popular broadband last mile solution is the digital subscriber line (DSL) and cable modem. Unfortunately, they can not provide enough bandwidth for increasing demands such as Voice over IP (VOIP), Video On Demand (VOD), video conference, interactive games, data traffic, and so on. That is because the transmitting media of DSL and cable networks is copper whose capacity-distance product is limited by its intrinsic property. On the other hand, fibers have been applied for many years, which can provide enormous bandwidth and high quality transmission. Nowadays the optical communication technique is able to afford 40 gigabits per second (Gbps) in single wavelength. Therefore the fiber to the home (FTTH) or fiber to the building (FTTB) is a promising solution of the last mile problem. Ethernet Network Optical Network (EPON) which represents the convergence of low-cost Ethernet equipment and low-cost fiber infrastructure appears to be the best candidate for the FTTB which is the best solution for the next-generation access network.
Presently, dynamic bandwidth allocation (DBA) time division multiple access (TDMA) EPON protocol is popular because TDMA protocol is easy to implement and instinctive to invent. On the other hand, optical code division multiple access (OCDMA) protocol is an alternative solution. In this thesis, we use the OCDMA as channel sharing method in upstream transmission to prevent the packet collision in the central office (CO). Besides, we adopt the perfect difference codes in our DBA CDMA EPON protocol. This code is very efficient and suitable to use in EPON. For increasing the bandwidth efficiency and flexibility, we design the dynamic bandwidth allocation (DBA) CDMA EPON protocol. In other words, the optical network unit (ONU) which is in user-end can use different number of codes to transmit data according to its buffer condition. In this way, the DBA CDMA EPON protocol can much improve the bandwidth efficiency and flexibility. Additionally, we will compare network performance between IPACT (DBA TDMA EPON protocol) and DBA CDMA EPON protocol. IPACT is the most popular DBA TDMA EPON protocol presently. We will explain and prove that the performance of DBA CDMA EPON is much better than IPACT, and we will discuss the reason of this.
Subjects
協定
動態
分配
區域
乙太
被動
光
分碼
多工
最後一哩
網路
接取
EPON
Ethernet
CDMA
acces
OCDMA
optical network
PON
Type
thesis
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