multi-OLT Passive Optical Network Research Articles

ONU migration using network coding technique in Virtual Multi-OLT PON Architecture

Rapid bandwidth expansion necessitates large-scale, high-density access situations, in which a clustered deployment of numerous passive optical network (PON) systems may be used to meet the massive bandwidth needs, particularly for a future 5G mobile network. Multiple optical line terminals (OLTs) based PON is a promising candidate to meet these future demands. However, some of the available bandwidth is wasted because of the absence of collaboration among various OLTs. By applying the concept of network coding methods into OLTs and ONUs, this paper proposes an efficient virtual multi-OLT PON (VM-PON) network architecture for the metro access scenario to improve bandwidth efficiency. This is achieved by using a network coding method that simultaneously transfers two heavily loaded ONUs between the OLTs. By implementing an efficient ONU transfer algorithm, load balancing is also managed in VM-PON among all the OLTs. To improve the network performance and reduce latency, optical network units (ONUs) in the VM-PON may dynamically regroup with various OLTs. The comparative simulation results demonstrate that the proposed VM-PON work achieved 37% throughput greater than traditional TDM-PON with a lower frame loss ratio and lower upstream delay and jitter.

An (adjustable RN)-based multi-OLT PON and the dynamic programming algorithm for downstream channel

In this paper, a multiple optical line terminal (OLT) passive optical network (PON) and the dynamic programming algorithm for downstream channel is proposed. By wavelength-selectable module, the adjustable remote node (RN) is constructed. By this adjustable RN, a simple and efficient multi-OLT PON is designed. By the way of first-plan and then-load, optical network unit (ONU) groups are established in order to realize the fast loading of ONUs. Specially, by introducing dynamic programming algorithm, the wavelength bandwidth utilization is maximized. Finally, by the simulation and analysis, the effectiveness of the proposed scheme is demonstrated.

(Overlap and non-overlap)-based DBA algorithm with wavelength optimal length for upstream channel in multi-OLT PON

Abstract In this paper, an (overlap and non-overlap)-based dynamic bandwidth allocation (DBA) algorithm with wavelength optimal length (WOL) for upstream channel in multi-OLT passive optical network (PON) is proposed. By introducing optical line terminal (OLT) pool, the problem of OLT services imbalance is solved. Based on the service and its weight factor, proportion algorithm is constructed to allocate OLTs and wavelengths to OLT pool and wavelength group respectively. By proposing a new concept of WOL, the bandwidth wastage is reduced. By presenting overlap and non-overlap algorithms, the bandwidth utilization is improved further. By the simulation and analysis, the effectiveness of the proposed algorithms is demonstrated.

Algorithm of both release and allocation bandwidth for downstream channel in multi‐OLT PON

A passive optical network (PON) with multiple optical line terminals (OLTs) will play an important role in the optical access network. In this study, a novel dynamic bandwidth allocation (DBA) algorithm for the downstream channel in a multi-OLT PON is proposed. To take care of bandwidth demands of different users, weight factors are introduced. Based on different weight factors, a core framework of the algorithm is constructed. Moreover, by combining a decision criterion and a bandwidth surplus ratio, a mathematical model of release bandwidth is established. Furthermore, by uniting judgement conditions and overload amount, a mathematical model of allocation bandwidth is also built. By constructing two mathematical models, the order and amount of release and allocation bandwidth are effectively solved. Moreover, to describe accurately the power of bandwidth transfer, a new concept ‘bandwidth-transfer work’ is introduced. Based on the bandwidth-transfer work, a ranking model is created to maximise the efficiency of the DBA. Finally, the effectiveness of the DBA algorithm and ranking model is demonstrated by the simulation and analysis.

Bidirectional multi-optical line terminals incorporated converged WSN-PON network using M/M/1 queuing

Wireless Sensor Networks (WSNs) have an assortment of application areas, for instance, civil, military, and video surveillance with restricted power resources and transmission link. To accommodate the massive traffic load in hefty sensor networks is another key issue. Subsequently, there is a necessity to backhaul the sensed information of such networks and prolong the transmission link to access the distinct receivers. Passive Optical Network (PON), a next-generation access technology, comes out as a suitable candidate for the convergence of the sensed data to the core system. The earlier demonstrated work with single-OLT-PON introduces an overloaded buffer akin to video surveillance scenarios. In this paper, to combine the bandwidth potential of PONs with the mobility capability of WSNs, the viability for the convergence of PONs and WSNs incorporating multi-optical line terminals is demonstrated to handle the overloaded OLTs. The existing M/M/1 queue theory with interleaving polling with adaptive cycle time as dynamic bandwidth algorithm is used to shun the probability of packets clash. Further, the proposed multi-sink WSN and multi-OLT PON converged structure is investigated in bidirectional mode analytically and through computer simulations. The observations establish the proposed structure competent to accommodate the colossal data traffic through less time consumption.

English

Aunifiedfiber-to-the-homes (FTTHs) and wireless sensor network (WSN) provides a profitable solution to build up an immaculate ubiquitous-City (U-city). The key objects of actual convergence of FTTH and WSN are less computational intricacy for data packet processing, little installation cost, and good quality of services. In this paper, we familiarise an integrated network structure of multi-optical line terminal (multi-OLT) passive optical network (PON) which can lodge multiple service workers in a single PON. A modified version of interleaved polling algorithm is proposed for scheduling of control messages from multiple OLTs in a single network. We also provide thorough mathematical analysis of cycle time variation, succeeding grant scheduling time, and average packet interruption for both uniform and non-uniform traffic loads generated by each ONU, using fixed service bandwidth provision scheme and limited service bandwidth sharing scheme. We also compare the throughput of the anticipated scheme with existing single-OLT PON for non-uniform traffic load using limited provision bandwidth allocation scheme. The replication results show that the proposed multi-OLT PON system can ropes prevailing bandwidth allocation schemes with better routine than the single-OLT PON in terms of average packet delay, bandwidth consumption, and throughput.

Dynamic Bandwidth Allocation Algorithm With Proper Guard Time Management Over Multi-OLT PON-Based Hybrid FTTH and Wireless Sensor Networks

A passive optical network (PON) is a highly capable access network that effectively converges several service providers, without suffering from any bandwidth deficiency. However, a PON consisting of a single optical line terminal (OLT) for multiple service providers increases the computational complexity for data packet processing in the OLT, resulting in a longer time delay and more packet loss. A multi-OLT PON-based access network is an effective solution for reducing the computational complexity of data packet processing in a hybrid network of multiple service providers. The most important issue concerning the multi-OLT PON is the sharing efficiency of upstream channels among multiple service providers having different packet lengths and data rates. In this paper, we propose a dynamic bandwidth allocation algorithm called adaptive limited dynamic bandwidth allocation for multi-OLT PON (ALDBAM). The proposed scheme is a modified version of adaptive limited dynamic bandwidth allocation (ALDBA) algorithms that we proposed before, where both the ALDBA1 and ALDBA2 schemes are combined with proper guard time management and a modified multipoint control protocol. The simulation results show that the ALDBAM scheme provides lower packet delay with higher bandwidth utilization, higher upstream efficiency, and higher throughput than the conventional ALDBA1 and ALDBA2 schemes.

Architecture of multi-OLT PON systems and its bandwidth allocation algorithms

In this paper, we propose a novel passive optical network (PON) architecture that has multiple optical line terminals (OLTs). Unlike existing PONs where all ONUs are connected to a single OLT, the ...

Network Architecture and Performance Analysis of MULTI-OLT PON for FTTH and Wireless Sensor Networks

An integrated fiber-to-the-homes (FTTHs) and wirele ss sensor network (WSN) provides a cost-effective solution to build up an immaculate ubiquitous-City (U-city). The key objectives of effective converge nce of FTTH and WSN are less computational complexity f or data packet processing, low installation cost, and good quality of services. In this paper, we int roduce an integrated network structure of multi-opt ical line terminal (multi-OLT) passive optical network ( PON) which can accommodate multiple service providers in a single PON. A modified version of in terleaved polling algorithm is proposed for schedul ing of control messages from multiple OLTs in a single network. We also provide detailed numerical analysi s of cycle time variation, successive grant schedulin g time, and average packet delay for both uniform a nd non-uniform traffic loads generated by each ONU, us ing fixed service bandwidth allocation scheme and limited service bandwidth allocation scheme. We als o compare the throughput of the proposed scheme with existing single-OLT PON for non-uniform traffi c load using limited service bandwidth allocation scheme. The simulation results show that the propos ed multi-OLT PON system can supports existing bandwidth allocation schemes with better performanc e than the single-OLT PON in terms of average packet delay, bandwidth utilization, and throughput .