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Passive optical network system and implementation method thereof

A technology of passive optical network and implementation method, applied in the field of passive optical network system and its implementation, can solve problems such as low-latency service delay carried by PON, and achieve the effects of high bandwidth utilization, more controllable delay, and small delay

Active Publication Date: 2019-09-06
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] On the other hand, in traditional passive optical network systems, bandwidth allocation is generally based on ONU bandwidth requests or OLT's own detection of ONU traffic, that is, dynamic bandwidth allocation. This bandwidth allocation method can achieve high bandwidth utilization. , but there is a certain lag in the process of bandwidth allocation, which brings a large delay to PON carrying low-latency services
Take bandwidth allocation based on ONU bandwidth request as an example, such as image 3 As shown, the user data arrives at the ONU until the ONU sends the user data to the OLT. In the middle, the ONU requests bandwidth from the OLT according to the user data, and the OLT inputs the ONU bandwidth request to the DBA algorithm engine and obtains the bandwidth allocation result from the DBA algorithm engine. The allocation result is sent to the ONU, and the ONU sends the user data at the specified time. The delays caused by the above operations include the ONU preparation bandwidth request time T DBRu , uplink transmission delay T PROGu , bandwidth allocation calculation time T DBA , downlink transmission delay T PROGd , sending time offset T OFF , in the case of 20KM long optical fiber, the uplink transmission delay and downlink transmission delay reach 100 microseconds respectively, and the bandwidth allocation method based on bandwidth request will bring at least 200 microseconds delay to uplink data transmission

Method used

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  • Passive optical network system and implementation method thereof
  • Passive optical network system and implementation method thereof
  • Passive optical network system and implementation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0235] In this embodiment, ONU registration and activation processes such as ONU discovery and ONU ranging are transplanted to additional management channels, including the following steps:

[0236] Step 1. The OLT periodically opens a quiet window on the additional management channel, and sends an SN request;

[0237] Step 2, when a new ONU needs to go online, the ONU waits for the quiet window opened by the OLT on the additional management channel and captures the SN request, and then competes to send the SN in the quiet window;

[0238] Step 3, the OLT obtains the SN of the new ONU on the additional management channel;

[0239] Step 4, the OLT distributes the ONU-ID to the new ONU on the additional management channel, and continues to open the ranging window, and sends a ranging request to the ONU;

[0240] Step five, the ONU sends a ranging response on the additional management channel;

[0241] Step 6. The OLT obtains the ranging response, calculates the ranging result ...

Embodiment 2

[0252] Based on Embodiment 1, the composition of the management channel is modified. The downlink wavelength of the management channel is still the same as the downlink wavelength of the original data channel. The uplink wavelength used by the management channel is different from the uplink wavelength of the original data channel. The format is the same as that of the original data channel, such as Figure 12 shown. Compared with the first embodiment, the second embodiment can save one downlink wavelength resource. Including the following:

[0253] Step 1. The OLT periodically opens a quiet window on the additional management channel, and sends an SN request from the original data channel;

[0254] Step 2. When a new ONU needs to go online, the ONU waits for the quiet window opened by the OLT on the extra management channel and captures the SN request sent on the original data channel, and then competes to send it in the quiet window on the extra management channel SN;

[...

Embodiment 3

[0264] On the basis of Embodiment 1, in addition to transplanting the ONU registration processes such as ONU discovery and ONU ranging to the additional management channel, this embodiment also transfers DBA allocation (BWmap / grant), bandwidth request DBRu / REPORT, and physical layer management information. The interaction of management information such as PLOAM / MPCP and application layer management information OMCI / OAM is also transplanted to additional management channels. Among them, bandwidth mapping (BWmap), DBRu, PLOAM, OMCI, etc. are applied to ITU-T PON series standards such as GPON and 10GGPON; grant, REPORT, MPCP, OAM, etc. are applied to IEEE PON series standards.

[0265] The ONU registration activation process is as follows, consistent with Embodiment 1:

[0266] Step 1. The OLT periodically opens a quiet window on the additional management channel, and sends an SN request;

[0267] Step 2, when a new ONU needs to go online, the ONU waits for the quiet window open...

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Abstract

The invention discloses a passive optical network PON system and an implementation method thereof. The implementation method of the passive optical network (PON) system comprises: an optical line terminal (OLT) determining a fixed value T, distributing bandwidth to an optical network unit (ONU) according to the characteristics of services borne by the PON system, and the interval between any two adjacent bandwidths does not exceed the fixed value T. According to the method, an optical line terminal (OLT) determines a fixed value T, bandwidth is distributed to an optical network unit (ONU) according to the characteristics of services borne by a PON system. The interval between any two adjacent bandwidths does not exceed the fixed value T, so that the bandwidth distribution of the inventiondoes not depend on the bandwidth request of the ONU or the monitoring of the ONU flow by the OLT, and the data transmission delay of the ONU is further shortened.

Description

[0001] This case is a divisional application of patent application 201611096860.5. The filing date of the original application is December 2, 2016, and the application number is 201611096860.5. The invention and creation name is a passive optical network system and its implementation method. technical field [0002] The invention relates to passive optical network technology, in particular to a passive optical network (PON) system and its realization method. Background technique [0003] The traditional network architecture of passive optical network such as figure 1 shown. The channel between the optical line terminal (OLT) and the optical network unit (ONU) not only transmits data, but also transmits management information, that is, the OLT and the ONU communicate through a channel. With the development of mobile networks, passive optical networks have gradually become one of the bearer technologies for mobile fronthaul, mobile backhaul, sensor networks, and vehicle-mount...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04Q11/00
CPCH04Q11/0067H04Q2011/0079H04Q2011/0086H04Q2011/0064H04Q11/00
Inventor 张伟良李明生耿丹郭勇
Owner ZTE CORP
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