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Method and system for improving bandwidth allocation efficiency

A bandwidth allocation and efficiency technology, applied in the field of optical communication, can solve problems such as bandwidth inconsistency, limited buffer space, affecting XGPON network fairness and allocation efficiency, and achieve the effect of improving efficiency and reducing performance differences

Inactive Publication Date: 2014-09-17
ZTE CORP +1
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  • Application Information

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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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  • Method and system for improving bandwidth allocation efficiency

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Embodiment Construction

[0036] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described below are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0037] Since XGPON acts as a time-division system, each Alloc_ID has the opportunity to send data only in a certain upstream time slot, so the data packet must be stored and forwarded after entering the ONU. If the time slot of Alloc_ID is not reached, the buffer is full. Packets are naturally dropped. However, it is also found from practical engineering applications that if the bandwidth is large enough, many data packets can be read out and sent immediately after entering the buffer area. It can be said that this part of data does not need to be cached. Knowing the actual traffic situation of Alloc_ID, Alloc_ID can fully support the data flow that excee...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00H04L12/917H04L47/30H04L47/76
CPCH04L12/6418H04Q11/0067H04Q2011/0086H04L41/0896H04L47/30H04L47/745
Inventor 金军
Owner ZTE CORP
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