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