Adaptive polling algorithm to provide subscriber and service differentiation in a Long-Reach EPON

Abstract

A novel interleaved polling algorithm for LongReach EPONs is proposed in order to simultaneously provide subscriber and class of service differentiation. It is demonstrated that the new polling algorithm applied to a typical 100 km Long-Reach EPON performs better than centralized methods, where bandwidth prediction is needed to overcome the higher round trip time in which ONUs cannot transmit. As polling methods in Long-Reach EPONs do not require prediction, they are much simpler and show less computational complexity than centralized schemes, avoiding the inaccuracy of bandwidth prediction. Simulation results show that the new algorithm increases the achieved throughput when compared to centralized algorithms with traffic prediction, obtaining a significant reduction of both mean packet delay and packet loss ratio for the highest priority service level profiles.Keywords Long-Reach · Passive optical network (PON) · Dynamic bandwidth allocation (DBA) · Service level agreement (SLA) · Class of service (CoS) · Ethernet

Delay-Constrained Admission and Bandwidth Allocation for Long-Reach EPON

“…In [26], an adaptive polling scheme is proposed for LR-EPON in order to differentiate various classes of service packets. This scheme is further improved to utilize the upstream gaps through inserted polling cycles [26].…”

“…In [26], an adaptive polling scheme is proposed for LR-EPON in order to differentiate various classes of service packets. This scheme is further improved to utilize the upstream gaps through inserted polling cycles [26]. In [27], a fair online distribution of the excessive bandwidth at each polling cycle is introduced in order to overcome the instability of the bandwidth distribution beyond certain critical loads.…”

A bandwidth assignment polling algorithm to enhance the efficiency in QoS long‐reach EPONs

“…Related to the evaluation of the algorithms, LOHEDA is compared with LIPSA to analyze the improvements achieved by the former, since LIPSA demonstrated higher efficiency compared to other proposed algorithms in longreach EPONs [13]. Finally, in order to make a correct statistical analysis of results, they are represented within 95% of confidence level.…”

“…As the nature of network traffic is neither homogeneous nor continuous, the traffic estimation may become complex. On the contrary, polling schemes have demonstrated good performance for long-reach PONs [13]. In these algorithms, the OLT allocates bandwidth to each ONU just after received its control message.…”

“…Therefore, ONUs associated with a higher weight will be assigned more bandwidth. Moreover, the algorithm proposed in Reference [13], assumes different weights to ensure a minimum guaranteed bandwidth to each profile following a polling policy.…”