A comparative study of dynamic bandwidth allocation algorithms for long reach passive optical networks

作者：Sivakumar Anusha^*; Sankaran Ganesh Chennimalai; Sivalingam Krishna M

来源：IETE Technical Review, 2012, 29(5): 405-413.

DOI：10.4103/0256-4602.103174

• Dynamic bandwidth allocation algorithms
• Long reach passive optical networks
• Passive optical networks
• Performance comparison

Passive Optical Networks (PON) have emerged as an important fiber-based access network alternative to DSL, Cable, and other access networks. Some of the limitations of PONs are that it can support only up to 64 subscribers and reach up to 20 km. Dynamic Bandwidth Allocation (DBA) algorithms enable multiple subscriber nodes to efficiently share the upstream channel. In this paper, we investigate the performance of DBA algorithms for Long Reach passive optical networks (LR-PON) that support network coverage up to 200 km and up to 2 048 subscribers. Thus, LR-PONs can act as integrated metropolitan and access networks. Due to the increase in round trip time of the network from a few hundred ms in case of PON to few milliseconds in case of LR-PON, DBA algorithms proposed for PONs may not be applicable as is to LR-PONs. The algorithms studied are WDM-IPACT, Intelligent Gap Filling strategy, Multi- thread Polling, and Newly Arrived Frames Plus. The algorithms have been compared in terms of packet delay and consumed CPU resources, using discrete-event simulation modeling. The results indicate that Multi-Thread Polling is most efficient in terms of packet delay; however, WDM-IPACT leads to 20 increased delay while consuming only 50 of the CPU resources required for Multi-thread Polling.

• 出版日期2012-10