GPON service level agreement based dynamic bandwidth assignment protocol

Abstract

A dynamic bandwidth assignment protocol is proposed that demonstrates impartial and highly efficient bandwidth arrangement for gigabit-capable passive optical networks. In particular the novel algorithm automatically modifies the assigned bandwidth per optical network unit to support quality of service and service level agreement according to maximum network capacity and users' queuing status. Network simulation results have demonstrated superior mean packet delay performance achieving a tenfold reduction of packet delay at high network load when compared to other dynamic bandwidth assignment algorithms.

A G.984 GPON Exhibiting Multi-wavelength Protocol Functionalities

“…This has been initially achieved by developing the dynamic minimum bandwidth (DMB) algorithm [4,5] and modifying the GPON frame format to support multi-wavelength operation. The DMB algorithm facilitates three SLAs to assign each ONU with a guaranteed minimum bandwidth, to satisfy their basic service requirements, plus an additional allocation of extra bandwidth on demand based on the assigned SLA.…”

“…) is then assigned according to the DMB algorithm [4,5] as in equation (2). Random distribution of ONU traffic among the different wavelengths could potentially result in exceeding the maximum available cycle-time.…”

PON topologies for dynamic optical access networks

“…To allow centralised, dynamic bandwidth allocation among the architecture's TDM and WDM-PONs, the OLT according to the developed algorithms will assign varying frame time-slots, initially to each PON in order-ofdemand and subsequently arrange each PON bandwidth among their ONUs based on their service level and individual bandwidth requirement [3,6]. In that direction, the DMB protocol [3] provides ONUs in TDM-PONs with three service levels at different weights, W t , to represent network accessing priority.…”

“…In that direction, the DMB protocol [3] provides ONUs in TDM-PONs with three service levels at different weights, W t , to represent network accessing priority. Subsequently the algorithm automatically assigns to each ONU a guaranteed minimum bandwidth, B t min , from the overall network capacity, to satisfy their basic service requirements at various service levels t and apportions any unused bandwidth to ONUs according to their buffer queuing status.…”

“…A scalable multi-PON access network architecture [2] has been investigated in that direction to provide interoperability among dynamic time division multiplexing (TDM) and wavelength division multiplexing (WDM)-PONs through coarse WDM (CWDM) routing in the optical line terminal (OLT). To provide bandwidth on demand, a novel TDM dynamic minimum bandwidth (DMB) allocation protocol and an upgraded version have been proposed to achieve quality of service (QoS) at three different service levels and diverse network throughputs [3]. In addition, to allow for WDM-PON resource allocation, to overcome the inevitable network congestion of single wavelength networks, the developed medium access control (MAC) protocols have been extended to implement logical point-to-point topologies based on general loop-back WDM-PON architectures [2] to increase service provisioning between reflective optical network units (ONUs) and the OLT by vigorously distributing network capacity simultaneously between the upstream and downstream.…”