Method and system for improving bandwidth allocation efficiency

Abstract

The invention, which relates to the field of optical communication, discloses a method and system for improving a bandwidth allocation efficiency. The method comprises: in a passive optical network (PON) system, an optical network unit (ONU) detects each transmission container TCONT in real time; when one certain TCONT is detected to be buffered and overflowed, a private message for reporting buffering and overflowing is sent to an optical line terminal (OLT); according to the message for reporting buffering and overflowing, the OLT sends a private message for indicating the ONU to start an overflowing allocation mechanism to the ONU; after the ONU receives the message for indicating the ONU to start the overflowing allocation mechanism, the overflow allocation mechanism is started and an actual buffer flow of the TCONT is calculated, and the calculated actual flow is sent to the OLT; and on the basis of the actual buffer flow of the TCONT, the OLT allocates the bandwidth to the TCONT dynamically.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a method and a related device for improving bandwidth allocation efficiency in a passive optical fiber network (PON) system. Background technique [0002] In the 10 Gigabit passive optical network XGPON protocol, each optical network unit ONU can have multiple transmission containers TCONT, each TCONT is represented by an allocation identification number Alloc_ID, and the corresponding upstream data flow is defined as a data Allocation. At the same time, in the frame structure of the uplink frame, such as figure 1 As shown, each Allocation has a dynamic bandwidth report DBRu domain, and the DBRu domain includes a 3-byte BufOcc field and a 1-byte CRC. BufOcc represents all service data unit SDU flow values ​​that flow through the buffer associated with the Alloc_ID of the allocated bandwidth, and the expression value of these flows is in units of word length of 4 bytes. Acco...

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Problems solved by technology

However, different types of ONUs have different cache management mechanisms, and the cache utilization and cache size will also be inconsistent. In this way, when the OLT PON port in an XGPON system is connected to multiple types of ONUs, the same configuration and traffic model Alloc_ID, OLT The allocated bandwidth will also be inconsistent, which will affect the fairness and allocation efficiency of the XGPON network

[0007] The main reason is that due to the limited cache space, when TCONT receives a large amount of traffic, the cache will overflow, causing the reported DBRu to remain at a constant value, which is theoretically the maximum value of the Alloc_ID cache

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