Improved EPON (Ethernet passive optical network) dynamic bandwidth allocation method

Abstract

The invention provides an improved EPON (Ethernet passive optical network) dynamic bandwidth allocation method, which adopts an improved DBA (database administrator) algorithm to solve the problem of bandwidth allocation in an EPON system. The improved EPON dynamic bandwidth allocation method is characterized in that: firstly, the last bandwidth request and a data frame in each cycle are determined, the bandwidth request is sent at first, and bandwidth allocation is performed in the time for data transmission to reduce losses of the cycle; secondly, a linear prediction coefficient is introduced to compensate the data request received in the time for waiting for authorization; and finally, secondary distribution of the bandwidth is performed, and bandwidth fragments allocated primarily are fully utilized. Due to the above three methods, the losses of the cycle can be reduced greatly, the rate of utilization of the bandwidth can be improved, and the business delay is decreased.

Description

technical field [0001] The invention relates to the field of optical access networks, in particular to the use of a novel DBA algorithm to solve the problem of bandwidth allocation in an Ethernet optical access network (EPON) network. Background technique [0002] The EPON system was launched early, the technology is mature, and the corresponding equipment, chips, and industrial chain are sound. It is one of the main optical access network technologies at present. It has been used on a large scale in Japan, South Korea and other Asian countries, and it is gradually getting better in my country. The uplink and downlink bandwidth of EPON is 1Gbps, the downlink is accessed by broadcasting, and the uplink is accessed by TDMA. [0003] EPON system is generally composed of optical line terminal (OLT), optical splitter (POS) and optical network unit (ONU). The OLT is the core of the EPON system, and the main allocation algorithm is implemented in it, which is responsible for alloc...

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Problems solved by technology

The CPFCT algorithm has a fixed polling cycle, and the delay and jitter are relatively constant. It has become the first cho

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