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

Abstract

Abstract-Next generation Passive Optical Network (PON) technology has been evolving to consolidate the metro and access networks in order to offer enhanced capacity, high split ratio and reduced deployment cost per subscriber. However, transmission of the signals to long distances up to 100km leads to increased propagation delay whereas high split ratio may lead to long cycle times resulting in large queue occupancies and long packet delays. In this article, we present a delay-constrained admission control mechanism and adapt this scheme to our previously proposed bandwidth allocation technique, namely Periodic GATE Optimization (PGO). We call this new scheme Delay-Constrained Periodic GATE Optimization (DC-PGO). DC-PGO is designed to run for multiple service classes as it inherits the advantages of PGO by periodically building and solving an ILP formulation at the OLT in order to obtain the appropriate credit values for the overloaded ONUs. At the ONU side, DC-PGO runs an admission control scheme before pushing the arriving packets in the sub-queues. The admission control scheme uses statistical information consisting of the local data at the ONU and the previously received GATE messages from the OLT. Through simulations, we show that DC-PGO enhances the performance of multi-threaded polling in longreach Ethernet PON when packets of differentiated service classes arrive with pre-specified delay requirements.

Synergized-Adaptive Multi-GATE Polling With Void Filling: Overcoming Performance Degradation in LR-PONs

“…The authors of [17] have proposed an integer linear programming (ILP) optimization technique over MTP to optimize grant sizing; nevertheless, the OLT requires sufficient central processing unit (CPU) power to be able to formulate and solve such an optimization model. Reference [18] further extends the work done in [17] by employing admission control mechanisms for different traffic classes. A DBA algorithm is proposed in [19], in which the authors combine MTP with a BR scheme based on adaptive threshold-based optical burst assembly.…”

Fair Bandwidth Allocation Algorithm for PONs Based on Network Utility Maximization

“…Every ONU contributes in the same proportion to the total network load, using a symmetric model as occurs in the majority of studies in PONs and Long-Reach PONs ( [13][14] [31][32][33]). The distance between ONUs and the OLT is set to 100 km, a realistic LR-PON setup [31][32][33]. The simulated traffic exhibits the properties of self-similarity using the traffic generator provided by Kramer in [34] (packets between 84 and 1538 bytes following the Ethernet standard).…”

Minimizing computing-plus-communication energy consumptions in virtualized networked data centers

“…where RT T j is the average round-trip-time of the j-th serverdispatcher end-to-end connection, r j (t) is the communication rate of the j-th virtual link at the t-th slot, and Ω j is the j-th virtual link power coefficient that depends on the maximum segment size of the transmitted packets and on the number of per-segment ACKs as described in [10], [19].…”