User level protocol and QoS (Quality of Service) based dynamic wavelength bandwidth distribution method in WDM-EPON (Wavelength Division Multiplexing-Ethernet Passive Optical Network)

Abstract

The invention discloses a user level protocol and QoS (Quality of Service) based dynamic wavelength bandwidth distribution method in a WDM-EPON (Wavelength Division Multiplexing-Ethernet Passive Optical Network). The user level protocol and QoS based dynamic wavelength bandwidth distribution method in the WDM-EPON comprises the steps of: extending a frame structure in an existing MPCP (Multi-Point Control Protocol) and enabling an OLT (Optical Line Terminal) to support multiple uplink wavelengths by using the extended MPCP; dividing services into three levels, .i.e., an EF service, an AF service and a BE service, wherein the EF service is firstly subjected to online real-time scheduling, and the bandwidth distributed to the EF service is a requested bandwidth and transmitted on an appointed wavelength; setting minimum guaranteed bandwidths for the AF and BE services based on the user levels (a high-level user, a middle-level user and a low-level user) and carrying out offline scheduling, to be specific, firstly, scheduling the AF / BE service of the senior user (first scheduling the AF service and then scheduling the BE service), and then scheduling the AF / BE services of the middle-level user and the low-level user according to the following sequence (the AF service of the middle-level user, the AF service of the low-level user, the BE service of the middle-level user and the BE service of the low-level user). According to the dynamic wavelength bandwidth distribution method, the time delay can be reduced, and the bandwidth utilization rate and the QoS of the user with high priority are improved.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to a dynamic wavelength bandwidth allocation method based on user level agreement and service quality in WDM-EPON. . Background technique [0002] The WDM-EPON system is considered to be the most economical and reasonable smooth upgrade solution for the transition from Ethernet Passive Optical Network (EPON) to Wavelength Division Multiplexing Passive Optical Network (WDM-PON), and has become the current standard of Passive Optical Network (PON). Development trends and research hotspots. Since the uplink direction of WDM-EPON is still a multipoint-to-point (MP2P) network structure, ONUs have to share uplink bandwidth resources, and bandwidth and wavelength allocation have become an indispensable part of WDM-EPON, which is also the research focus of WDM-EPON. [0003] WDM-EPON bandwidth and wavelength allocation can be divided into static wavelength dynamic time...

AI Technical Summary

Problems solved by technology

DhainiAR, AssiCM, ShamiA et al's literature "Quality of service in TDM / WDMEthernet passive optical networks (EPONs) (Research on QoS in TDM / WDM EPON)," Proceedings of 11thIEEE Symposium on Computers and Communications, 2006:616-621, proposed the QoSWDM-DBA algorithm, the basic idea of ​​which is to use variable Periodic polling method, first OLT allocates bandwidth to ONU, and then ONU allocates bandwidth for EF service, AF service and BE service, but this algorithm does not support user level agreement

The literature of AhmadR.Dhaini et al. "Dynamic wavelength and bandwidth allocation in hybrid TDM / WDMEPON networks (Dynamic wavelength bandwidth algorithm of TDM / WDMEPON hybrid network)", JournalofLightwaveTechnology, 2007, 25 (1): 277-286, proposed the SLAWDM-DWBA algorithm, which uses the restriction allocation Mechanism, set the minimum guaranteed bandwidth for each ONU according to the user level agreement, and reallocate the remaining bandwidth, but the bandwidth allocation is mainly based on the ONU, and does not support multi-service quality of service

PetarS.Matavulj et al's paper "Highly flexible and efficient model for QoSprovisioning in WDMEPON (a model for highly flexible and effective improvement of service quality in WDM-EPON)", IEEE / OSA Journal of Optical Communications and Networking, 2013, 5(8): 921-931, proposed a DWPBA-TCH algorithm based on business restrictions , the algorithm allocates bandwidth considering the overall service bandwidth request. When there is a burst of network traffic, it can well support the quality of service. However, the algorithm does not support user-level agreements, and the OFFLINE scheduling method used is not conducive to business hours. Delay performance, and two bandwidth allocations cause bandwidth waste

[0006] At present, some progress has been made in the ONU allocation and scheduling of WDM-EPON, but there are still many problems to be improved, such as the allocation and scheduling does not support the user level agreement and service quality, and cannot effectively allocate the remaining bandwidth, etc.

At the same time, in the WDM-EPON wavelength scheduling process, on the one hand, there is idle time, and the statistical multiplexing between wavelengths is not realized, which increases the service delay and is not conducive to bandwidth utilization; on the other hand, it does not support user quality of service and cannot distinguish between users. grade agreement

In the WDM-EPON bandwidth allocation process, because it does not support the user level agreement, the service quality of high priority users cannot be guaranteed, and the bandwidth utilization rate is low due to the heavy load business allocation twice

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