Implementation of ultra-low latency dynamic bandwidth allocation method for TDM-PON

Abstract

This paper proposes a new dynamic bandwidth allocation (DBA) method with low latency for campus area networks (Campus-LANs) and mobile fronthaul (MFH) based on time division multiplexing passive optical network (TDM-PON). These network systems require low latency of under 100 µs and priority control. The proposed method involves only two steps for allocation. The DBA cycle value, which is proportional to the latency, can be minimized because this method is very simple and appropriate for hardware (H/W) implementation. We implemented the proposed DBA on 10G-EPON MAC SoC and evaluated the allocation results and the latency on the 10G-EPON system. Our DBA offers ultra-low latency of 60 µs with priority control.

Towards converged, collaborative and co-automatic (3C) optical networks

“…During the allocation of bandwidth in uplink transmission, Ref. [33] also considers the priority of traffic demand. By allocating less bandwidth for each ONU according to priority information, this method can achieves an ultra-low delay of 60 µs.…”

“…An optimized TDM-PON with minimal latency for transport of constant bit rate fronthaul traffic was proposed using queuing theory [34], and it proves that latency less than 250 µs can be achieved in the TDM-PON fronthaul mathematical derivation. Also, authors in [35] propose a bandwidth allocation method with adaptive polling period which is a simple three-step allocation: the first two steps are based on the method proposed in [33], and the third step is to shorten the corresponding DBA cycle. This method can automatically adjust the DBA cycle according to the wireless service load conditions, thereby improving the bandwidth utilization while achieving fronthaul latency less than 60 µs.…”