A pon energy-saving method based on olt cache

Abstract

The invention discloses a PON energy saving method based on OLT cache. The method comprises the following steps: step 1: setting a cache at an OLT end, and setting Dth; step 2: querying a polling table; step 3: judging whether reaching a time of sending a GATE frame to an ONUi, if yes, skipping to step 4, and if not, skipping not step 2; step 4: comparing whether the Dolt exceeds the Dth, if yes,skipping to step 5, and if not, sending no data; step 5: if the Dolt or Uni exceeds Umax, skipping to step 9, and if neither the Dolt nor the Uni exceeds the Umax, skipping to step 6; step 6: if the Dolt exceeds the Uni, skipping to step 7, or otherwise, skipping to step 8; step 7, setting the size of data capable of being sent by the ONUi as the Dolt; step 8: setting the size of data capable ofbeing sent by the ONUi as the Uni; and step 9: setting the size of data capable of being sent by the ONUi as the Umax. The PON energy saving method disclosed by the invention has the advantages of saving energy and shortening the time delay.

Description

technical field [0001] The invention relates to the technical fields of optical communication, passive optical network and access network, in particular to a PON energy-saving method based on OLT cache. Background technique [0002] Passive Optical Network (PON) is the mainstream technology for optical fiber broadband access, mainly composed of optical line terminal (Optical Line Terminal, OLT) at the central office, optical network unit (Optical Network Unit, ONU) at the user end and optical distribution network (Optical Distribution Network, ODN) composition. The traditional PON system focuses on uplink and downlink bandwidth allocation, less consideration is given to the energy consumption of the PON system, and the polling mechanism mainly used in the PON system does not support the sleep and standby modes of the ONU. Therefore, with the rapid increase in the deployment scale of PON systems, the network energy consumption has increased sharply. Therefore, from the persp...

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Problems solved by technology

The UCS mechanism stipulates that the downlink data service must wait for the uplink time slot authorized by the ONU to be transmitted. Therefore, UCS has a better energy-saving effect, but the disadvantage is that it will introduce a large downlink delay and affect the service quality of the system.

Dung Pham Van and others proposed another Sleep-aware Dynamic Bandwidth Allocation algorithm (Sleep-awareDynamic Bandwidth Allocation, SDBA), which prolongs the ONU sleep time as much as possible by changing the polling cycle of SDBA. The disadvantage is that the setting of the polling cycle is complicated , it is necessary to allocate polling cycles for all services according to the most stringent requirements in different types of services

On the basis of SDBA, Dung Pham Van et al. proposed an enhanced sleep-aware dynamic bandwidth allocation algorithm (Advanced Sleep-aware Dynamic Bandwidth allocation, ASDBA). ASDBA further uses the time of transmitting control frames to change the scheduling order of traditional energy-saving dynamic bandwidth allocation. , although it can effectively reduce the energy consumption of the ONU, the algorithm cannot accurately calculate the bandwidth required by the service, and does not effectively use the information of the REPORT frame

The simple introduction of ONU sleep method in the existing passive optical network has the disadvantage of not being able to solve energy saving and delay reduction at the same time

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