A Dynamic Bandwidth Allocation Method for Ethernet Passive Optical Network

Abstract

The present invention provides a dynamic bandwidth allocation method for an Ethernet passive optical network, which is used to allocate the uplink bandwidth of each optical network unit in the Ethernet passive optical network, and the optical line terminal executes the token allocation thread and the bandwidth allocation thread Running in parallel, the token allocation thread guarantees a high token allocation completion rate through iterative allocation, and the sum of the slot lengths corresponding to the allocated tokens in each allocation cycle can be adapted to the allocation cycle duration. At the same time, the bandwidth allocation thread uses the dynamic bandwidth allocation cycle to adaptively allocate bandwidth by consuming tokens, ensuring high bandwidth allocation efficiency, and in the environment where the token allocation thread and the bandwidth allocation thread run in parallel, making efficient commands The process of card allocation and bandwidth allocation can be continued asynchronously, thereby improving the accuracy of bandwidth allocation, improving bandwidth utilization, reducing data transmission delays in Ethernet passive optical networks, and the processing logic is simpler and easier to implement.

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] 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 uplink time slot for each ONU, and the ONU can only transmit data in the authorized uplink time slot. The process by which the OLT arranges the uplink time slot for the ONU is the GPON uplink implementation of Dynamic Bandwidth Allocation (DBA, Dynamic Bandwidth Allocation) process. Therefore, the d...

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) message reduces the downlink channel capacity and increases bandwidth loss, so the data transmission delay is relatively large; in addition, because its 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 relatively complicated. It is difficult to implement, and it also leads to low bandwidth allocation accuracy. It is not suitable for services that are sensitive to delay and delay jitter or support service level agreements

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