A hybrid dynamic bandwidth allocation scheme operating with IACG and cooperative DBA for converged fronthaul networks

The time-division multiplexed passive optical network is seen as a candidate for converged fronthaul networks in 5G, which requires low latency and high capacity. In this paper, a hybrid dynamic bandwidth allocation (DBA) scheme for converged fronthaul that combines a status reporting DBA and a cooperative DBA is proposed. Different deployment scenarios and operating conditions in a 10-Gigabit-capable PON (XGS-PON) system are investigated using the OMNeT++ network simulator. The performance of the proposed hybrid DBA is evaluated in terms of average upstream delay and percentage of frame loss meeting a 140 µs queuing delay requirement for fronthaul traffic. Simulation results show a zero-frame loss for fronthaul traffic in all scenarios using the proposed hybrid DBA which is not achievable using only the status reporting DBA, confirming the advantages of the proposed hybrid DBA

Passive Optical Network Dynamic Bandwidth Allocation Algorithms for Converged Fronthaul

The research presented in this thesis is focused on the use of passive optical network (PON) dynamic bandwidth allocation (DBA) algorithms for converged fronthaul. This work adapts and extends an existing model for use with a status reporting DBA that incorporates a colorless grant. This thesis also proposes a hybrid DBA that operates with the status reporting DBA and cooperative DBA. The models for the status reporting DBA and the proposed hybrid DBA are implemented in the OMNeT++ network simulator. The performance of both DBAs is evaluated using four simulation experiments in two deployment scenarios for a 10 Gbit/s symmetric PON (XGS-PON) system with an emphasis on the average optical network unit (ONU) upstream queueing delay and the proportion of frames meeting the latency requirement for fronthaul traffic. This is achieved by allocating bandwidth to the different types of traffic in a converged network based on their priority and latency requirement. The key findings from the simulation experiments show that, when the delay distribution of frames is analysed, a status reporting DBA that incorporates a colorless grant is suitable for meeting the latency requirement in a converged network, provided an adequate allocation of bandwidth is made available for fronthaul traffic. More than 99% of the fronthaul traffic at 80% traffic load in all scenarios meet the fronthaul latency requirement in the status reporting DBA. Furthermore, when the two DBAs are compared, the hybrid DBA provides zero frame loss for fronthaul traffic in all scenarios which is not achievable using the status reporting DBA

Performance of PON dynamic bandwidth allocation algorithm for meeting xHaul transport requirements

Passive optical networks (PONs) use dynamic bandwidth allocation (DBA) algorithms to assign upstream bandwidth for different types of traffic to transmission containers (T-CONTs) used by optical network units (ONUS). In this paper, we show that the performance of a PON DBA algorithm that incorporates a colorless grant can ensure that the average upstream delay and delay distribution of T-CONT frames fall within the latency requirements for different traffic types in an xHaul transport network. We evaluate the performance of two deployment scenarios for a 10-Gigabit-capable PON (XGS-PON) system using the OMNeT++ network simulator. The simulation results show that, when the delay distribution of frames is analyzed, more than 99% of fronthaul traffic at 80% load in both scenarios are below the 250 mu s latency requirement. Overall, the results indicate that the latency requirements of fronthaul traffic can be met by over-allocating bandwidth to it relative to other types of traffic in the network