Dynamic bandwidth allocation method for Ethernet passive optical network

Abstract

The invention provides a dynamic bandwidth allocation method for the Ethernet passive optical network. The method is used for allocating uplink bandwidth of all optical network units in the Ethernet passive optical network. According to the method, parallel running of a token allocation thread and a bandwidth allocation thread is performed through an optical line terminal, the token allocation thread ensures a high token allocation finishing rate through iteration allocation, and the sum of the lengths of time slots corresponding to allocated tokens in each allocation period is adaptive to the time length of the corresponding allocation period; meanwhile, the bandwidth allocation thread allocates the bandwidth in a self-adaptive mode with a dynamic bandwidth allocation period by consuming the tokens to ensure high bandwidth allocation efficiency, and moreover the efficient token allocation process and the efficient bandwidth allocation process can be carried out continuously in an asynchronous mode in the environment of parallel running of the token allocation thread and the bandwidth allocation thread, so that bandwidth allocation precision is improved, the bandwidth use ratio is promoted, data transmission delay of the Ethernet passive optical network is reduced, and moreover processing logic is simpler and easier to achieve.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to the technical field of Ethernet optical fiber network communication, and in particular to a dynamic bandwidth allocation method of an Ethernet passive optical network. Background technique [0002] The Ethernet Passive Optical Network (EPON) is formed by connecting the Optical Line Terminal (OLT) at the central office and the Optical Network Unit (ONU) at the user end through the Optical Distribution Network (ODN). Broadcast mode, the uplink direction (from ONU to OLT) adopts time division multiple access (TDMA) mode. In order to avoid conflicts, the OLT allocates an upstream time slot for each ONU. The ONU can only transmit data in the authorized upstream time slot. The process of the OLT arranging the upstream time slot for the ONU is the GPON upstream dynamic bandwidth allocation (DBA, Dynamic Bandwidth Allocation). Allocation) process. Therefore, the dyn...

AI Technical Summary

Problems solved by technology

IPACT provides statistical multiplexing between ONUs and thus brings more efficient upstream channel utilization. Its shortcoming is that frequent polling under low load generates a large number of MPCP (Multi-Point Control Protocol, multi-point control protocol) messages reduce the downlink channel capacity and increase bandwidth loss, so the data transmission delay is relatively large; in addition, because the cycle length is variable, the bandwidth that can be allocated is determined based on the cycle length, the two are closely related, and the allocation logic is more complicated , it is more difficult to implement, and it also leads to low bandwidth allocation accuracy, which is not suitable for services that are sensitive to delay and delay jitter or support service level agreements

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