Dynamic bandwidth allocation method for self-adapting service quality assurance in Ethernet passive optical network

Abstract

The invention relates to real-time service transmission quality assurance in the communication of an Ethernet passive optical network, in particular to a dynamic bandwidth allocation method for self-adapting service quality assurance in the Ethernet passive optical network. The method adopts the technical scheme that: on the premise of assuring the service quality promised by a system, such as maximum time delay and time delay dithering of a real-time service, according to uplink capacity and downlink capacity of the system, the polling cycle is automatically regulated to enable the system performances including throughput, time delay and time delay dithering to be optimal. The method comprises the following steps: firstly, determining a maximum polling cycle of the system according to the maximum time delay and the time delay dithering of the real-time service which can be assured by the Ethernet passive optical network (EPON) system; secondly, determining the minimum polling cycle according to the downlink capacity of the system; thirdly, predicting the traffic of an optical network unit (ONU); and fourthly, allocating the bandwidth. The invention is mainly applied to the communication of the Ethernet passive optical network.

Description

technical field [0001] The invention relates to the quality assurance of real-time service transmission in Ethernet passive optical network communication. Specifically, it relates to a dynamic bandwidth allocation method for self-adaptive guarantee of service quality in the Ethernet passive optical network. technical background [0002] (1) Background knowledge of access network and Ethernet Passive Optical Network (FPON). [0003] Various services in the access network have different requirements for delay or delay jitter. In order to meet their respective needs, services are divided into different priorities. Generally, services with higher requirements for delay and delay jitter have higher priority. priority. Quality of Service (QOS) guarantee refers to providing different services to different priority industries carried by them to meet their different requirements. [0004] In EPON, the time-division multiplexing of multiple optical network units (ONUs) is realized ...

AI Technical Summary

Problems solved by technology

[0007] (3) Insufficiency of existing DBA strategies

[0008] The main shortcomings of the adaptive periodic polling mechanism, taking the IPACT algorithm [2] as an example, are: ① The length of the polling cycle is not fixed, and the delay and delay jitter caused by it are also not fixed

Aiming at these problems, a residual bandwidth redistribution mechanism [3] was proposed. The basic idea is to allocate the excess bandwidth of the light-loaded ONU to the heavy-loaded ONU, so as to reduce the service delay of the heavy-loaded ONU and enhance the statistics of the system. Multiplexing efficiency, but this mechanism does not completely solve the above two problems, and at the same time reduces the bandwidth utilization due to the problem of idle loss between cycles [4]

The main disadvantage of the fixed-period polling mechanism, such as the CPFCT algorithm [1], is that no matter whether the downlink is light-loaded or not, the delay of the uplink service is almost unchanged, even when the uplink is light-loaded, which increases the service delay. and delay jitter, and it also has the problem of idle loss between cycles

[0009] In addition, a common problem in the existing DBA strategy is that when restricting access is used, the selection of the important parameter of the maximum polling cycle is arbitrary, and there is no exact basis in reality, and the performance of the system cannot be optimized.

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