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Passive optical network (PON) has become the vital technology for the next generation access networks. The advancement of optical technology extends the span of the PON from 20 to 100 km. Such an extended PON is known as Long-Reach PON (LR-PON). But the data transmission in the existing LR-PONs suffer from longer propagation delays between the optical line terminal (OLT) and optical network units...
We propose a traffic prediction algorithm that reduces the packets delay in Ethernet Passive Optical Networks (EPONs). The algorithm relies on Multi-Point Control Protocol (MPCP) message and traffic monitoring at the Optical Network Units (ONUs) and utilizes the monitoring information to predict the accumulated burst size using higher order least-mean-square polynomial approximations. The simulation...
Fiber Wireless (FiWi) provides a solution that combines gigabit passive optical network and Wi-Fi to provide huge capacity as well as mobility support. To manage the bandwidth in FiWi, a dynamic bandwidth allocation is proposed in this paper where it uses time division multiple access at the optical part and Carrier Sense Multiple Access with Collision Avoidance at the wireless part. Two methods are...
Ethernet Passive Optical Network (EPON) is one of the most promising technologies for FTTX deployed by service providers at the access network. Dynamic Bandwidth Allocation (DBA) for the upstream traffic can help optimize the network bandwidth utilization. This paper discusses a centralized DBA called as Universal DBA (UDBA) algorithm that supports quality of service (QoS) of the upstream traffic...
Passive Optical Networks (PONs) are attractive fiber-based access systems providing broadband access solutions at a low cost. A hybrid Wavelength Division Multiplexing (WDM) — Time Division Multiple Access (TDMA) PON is a favorite PON configuration, in which the researchers have drawn much attention. We have analysed and proposed several protocols for dynamic wavelength allocation in a WDM-TDMA PON,...
Implications of implementing a local storage within Passive Optical Networks to enhance Video-on-Demand delivery are critically examined in this work. We conduct packet level simulations in order to study enhancements of Quality of Service attributes. Two architectures where the Passive Optical Network is equipped with and without a local storage server are simulated to study the behavior of packet...
Ethernet passive optical network (EPON) is becoming more popular since the users demand more bandwidth each day. A lot of simulation studies have been done in order to study the upstream EPON transmission, but they are less accurate due to assumed parameters and it does not take into account the physical parameters and the non-linear effects of the optical components. Therefore, this paper presents...
The existing energy saving algorithms are implemented only with one kind of Passive Optical Network (PON). However, as far as Ethernet PON (EPON), good performances can not be reached simultaneously in both 10G-EPON and 1G-EPON. 10G-EPON can provide higher throughput and lower delay than 1G-EPON, but it consumes more energy. Therefore, to obtain trade-off performances, we propose a new Energy Saving...
The integrated architecture of complementary Ethernet Passive Optical Network (EPON) and Worldwide Interoperability for Microwave Access (WiMAX) technologies combine the benefits of optical fiber capacity and wireless network mobility, which will become one of the promising broadband access technologies for next-generation network. In this paper, we propose a novel hybrid dynamic bandwidth allocation...
We propose a novel cost-effective architecture of passive optical network (PON), which can support multiple optical line terminals (OLTs). We also propose Guaranteed Limited Dynamic Bandwidth Allocation (GLDBA) scheme for flexibly managing downstream bandwidth among multiple OLTs. For upstream transmission in the proposed multi-OLT PON system, we modify Limited Dynamic Bandwidth Allocation (LDBA)...
We propose and evaluate a novel energy and delay efficient OFDMA-based master medium access control (MAC) framework — the meta-MAC — for heterogeneous coexistence in next-generation PON, featuring both low computational complexity and low end-to-end packet delay.
So far latency has been regarded as a minor issue in Passive Optical Networks (PONs). However it may become a key factor for the commercial success of PON and WDM-PON. In this work we review the relevance of very-low latency in the access as the enabler of new higly-interactive cloud services. Then, we propose an approach for delay-based differentiation in PON that causes the delay variance to become...
The use of dynamic optical circuits for IP offloading, also referred to as optical bypass, was proposed to counter overloading in IP networks caused by sudden traffic surges. Approaches proposed to date use single path routing to setup optical bypass. However, the discrete bandwidth granularities of optical circuits may lead to the so-called bandwidth mismatch issue where the capacity of an optical...
This article proposes a mechanism to increase the energy efficiency of the upstream channel in TDM-base PONs. Essentially, the ONUs are encouraged to accumulate traffic and transmit data bursts just by increasing the cycle time values artificially. The guard time is enlarged to avoid the case where ONUs are queried by the OLT and have none or few packets to transmit, thus allowing more time to sleep...
Passive Optical Networks (PONs) are a promising candidate to solve the last-mile problem in access networks. By using optical fibers, PONs can offer to the subscribers higher capacity than other traditional access technologies, such as xDSL or Cable-TV, at a lower cost than FTTx solutions. As for any other access-network technology, security is a very important issue. PONs have very specific security...
Recently, Ethernet Passive Optical Network (EPON) with sleep mode has been actively investigated to improve energy conservation in the broadband access network. EPON with cyclic sleep mode transmits up/downstream traffic at the same time and put into the sleep mode at idle time in Optical Network Unit (ONU). However, QoS requirement can be violated by the cyclic sleep mode. In this paper, we propose...
Three ONU auto-discovery schemes are proposed to reestablish connections between ONUs and OLT in network failure restoration for OFDMA-PONs. Simulation is conducted to compare the performances of these schemes.
Several centralized algorithms have been proposed for bandwidth-allocation in passive optical networks (PONs); making the optical line terminal (OLT) in the central office the intelligent device that arbitrates time-division access to the shared upstream channel. When the distance between the OLT and optical network units (ONUs) is extended from 20 km to 100 km and beyond, as suggested by next generation...
This paper proposes two techniques for reducing the buffer size and computational complexity of an aggregation layer-2 switch (L2SW) in access systems by using buffer observation and multilevel dynamic bandwidth allocation (DBA). The conventional architecture for providing cousin fairness, which realizes fairness among multiple passive optical network (PON) branches, needs a huge buffer in an L2SW...
In order to fully optimize the bandwidth in upstream Ethernet passive optical network, dynamic bandwidth allocation (DBA) algorithm is used to allocate the bandwidth efficiently. In this paper, DBA algorithm that can support global priority is used to ensure the quality of service. Fuzzy logic is incorporated for the first time in the global priority DBA to reduce the packet loss as low as 13% and...
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