WO2011150759A1

WO2011150759A1 - Method, apparatus and system for processing signal of pon network

Info

Publication number: WO2011150759A1
Application number: PCT/CN2011/074631
Authority: WO
Inventors: 叶飞; 高建河; 廖振兴; 易永江; 弗兰克·艾芬伯格; 卫国
Original assignee: 华为技术有限公司
Priority date: 2010-09-13
Filing date: 2011-05-25
Publication date: 2011-12-08
Also published as: CN102131130B; CN102131130A

Abstract

A method for processing signal in Passive Optical Network (PON) network with multiple uplink channels is provided in the embodiments of the present invention, which characterized in that the method includes: Optical Line Terminal (OLT) generates a corresponding relationship table 2 of all the Optical Network Units (ONU), the downlink channels and the uplink channels; when received the uplink data from the ONUs, the OLT determines the corresponding uplink channel according to the identity OUN-ID of the ONU for transmitting the data, the downlink channel identity DS-CID corresponding to said ONU-ID, or the uplink channel identity US-CID corresponding to said ONU-ID, wherein the ONU-ID, the DS-CID and the US-CID are included in the uplink data, then forwards the uplink data to the corresponding processing module for process through said uplink channel. An OLT and a system for processing the signal are also provided in the embodiments of the present invention. With the embodiments of the present invention, the OLT can identify the uplink data transmitted by ONU and forward it correctly to the corresponding processing module for process, on the basis of the original network without change on system programming, not only the compatibility is good, but also the cost effect is obvious.

Description

The invention relates to a signal processing method, device and system for a PON network. The application is filed on September 13, 2010, and the application number is 201010279644. The priority of the Chinese Patent Application, the entire contents of which is incorporated herein by reference.

TECHNICAL FIELD The present invention relates to the field of optical communications, and in particular to a signal processing method, apparatus and system in a PON network having a plurality of upstream channels.

BACKGROUND OF THE INVENTION Generally, a passive optical network (P0N) technology refers to a point-to-multipoint (P2MP) fiber access technology, and a passive optical network system consists of a local side 0LT (optical line terminal) and a user side. The 0NU (Optical Network Unit) or 0NT (Optical Network Terminal) and 0DN (Optical Distribution Network) are mainly composed of a tree topology.

0LT provides a network side interface for the P0N system, connecting one or more 0DNs. The ODN consists of a backbone fiber, a passive optical splitter, and a user fiber for connecting the 0LT device to the 0NU/0NT device for distributing or multiplexing data signals between the 0LT and ONU/0NT. The 0NU provides a user-side interface for the P0N system and is connected to the 0DN. If the 0NU directly provides the user port function, such as the Ethernet user port for PC Internet access, it is called 0NT. Unless otherwise stated, the 0NU mentioned below refers to 0NU and 0NT. In the P0N system, from 0LT to 0NU, it is called downlink. With 1490nm wavelength, the downlink data stream is broadcasted by all 0LT according to TDM to all 0NUs. Each ONU only receives data with its own identity. Conversely, from 0NU to 0LT is the uplink, using a wavelength of 1310nm. Since each ONU shares the 0DN and 0LT devices, in order to ensure that the uplink data of each ONU does not conflict, the P0N system adopts the TDMA mode, that is, allocates time slots for each ONU through 0LT, and each ONU must transmit data strictly according to the time slot allocated by 0LT. The Dynamic Spectroscopy Management - Passive Optical Network (DSM-P0N) is a hybrid P0N that combines wavelength division multiplexing (WDM) and time division multiplexing (TDM) technologies, as shown in Figure 1. Shown. In the downstream direction, one or more transmit interfaces (Tx) of 0LT send data signals to 0DN in WDM mode. At the RN, after the wavelength demultiplexer and the WDM coupler, each WDM signal is broadcast to each ONU through the optical power splitter in TDM mode, and each ONU receives only the data with its own identification. In the uplink direction, the burst optical signal transmitted by the 0NU is combined by the optical power splitter, and then combined again at the RN via the WDM coupler and the optical power splitter, and finally transmitted to the 0LT. Since the emission wavelengths of different 0NU transmitters may be different due to differences in temperature and modulation current, etc., all ONU transmitted uplink burst optical signals can be regarded as WDM optical signals at 0LT, and the wavelength demultiplexer It is then received by each receiving interface (Rx) and processed by the MAC and then sent to the network side. In order to ensure that the uplink data of each ONU does not conflict, the system adopts the TDMA mode on each uplink channel, that is, allocates time slots for each ONU through 0LT, and each ONU must transmit data strictly according to the time slot allocated by 0LT. In the DSM-P0N, there are multiple wavelength channels in the uplink and downlink directions, especially in the uplink direction. The transmission wavelength of the 0NU changes during data transmission, which may switch between different uplink channels, resulting in the 0LT upstream channel not being accurately The corresponding uplink data is received, so that the entire uplink data cannot be processed correctly. SUMMARY OF THE INVENTION In view of the above problems, embodiments of the present invention provide a signal processing method, apparatus, and system in a PON network having multiple uplink channels. A signal processing method in a P0N network having multiple uplink channels, including:

0LT generates a correspondence relationship between the 0NU and the downlink channel. According to the correspondence table 1 of all the ONUs and the downlink channels, and the inherent binding relationship between the uplink channel and the downlink channel, the correspondence between all the ONU, the downlink channel, and the uplink channel is generated. Table 2: When receiving the uplink data from the ONU, the 0LT is based on the identifier 0NU-ID of the ONU that transmits the data included in the uplink data, or the downlink channel identifier DS_CID corresponding to the ONU-ID, or the ONU The uplink channel identifier US-CID corresponding to the ID is determined, and after determining the corresponding uplink channel, the uplink data is forwarded to the corresponding processing module for processing by the uplink channel; wherein determining the corresponding uplink channel includes: if the uplink data includes The 0NU-ID or the DS-CID determines the corresponding uplink channel according to the correspondence table 2; if the uplink data includes the US-CID, the uplink channel can be directly determined. An optical line terminal OLT, the OLT includes a control function module, an uplink function module, and a downlink function module; the control function module is configured to generate a correspondence table 1 of the ONU and the downlink channel; and according to the uplink channel and The inherent binding relationship of the downlink channel generates a correspondence table 2 of all the ONUs, the downlink channel, and the uplink channel; and according to the identifier of the ONU that transmits the data included in the received uplink data, the ONU-ID, or Determining a corresponding uplink channel by using a DS-CID corresponding to the ONU-ID or a US-CID corresponding to the ONU-ID; the uplink function module, configured to receive uplink data, and determine an uplink channel according to the control function module The uplink data is forwarded to the corresponding processing module for processing by using the uplink channel, and the downlink function module is configured to send downlink data. A signal processing system, the system comprising a plurality of ONUs and the above-mentioned 0LT, the 0LT generating a correspondence table of all ONUs, a downlink channel and an uplink channel, and to the ONU through a downlink channel corresponding to the ONU Sending the identifier DS-CID of the downlink channel or the identifier US-CID of the uplink channel corresponding to the downlink channel; the ONU carries the DS-CID or US-CID in the sent uplink data, and the 0LT is according to the received After determining the corresponding uplink channel, the uplink data is forwarded to the corresponding processing module for processing by using the ONU-ID, the DS-CID, or the US-CID of the ONU in the uplink data. The present invention proposes to establish a mapping relationship between the ONU and the uplink channel for uplink data forwarding and processing, so that the 0LT can recognize the uplink data transmitted by the ONU and correctly transfer it to the corresponding processing module for processing. On the basis of the existing network, the adoption of this technical solution is not only compatible but also cost-effective.

BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.

1 is a schematic diagram of a prior art DSM-P0N system;

2 is a flowchart of a method according to Embodiment 1 of the present invention;

3 is a schematic diagram of an internal module of the 0LT in the second embodiment of the present invention;

4 is a schematic diagram of data flow between 0LT internal modules in Embodiment 2 of the present invention.

The embodiments of the present invention provide a signal processing method in a P0N network with multiple uplink channels. The mapping relationship between the ONU and the uplink channel is used to forward and process the uplink data, so that the 0LT can recognize the ONU transmission. On The row data is correctly transferred to the corresponding processing module for processing.

Embodiment 1 of the present invention provides a data processing method in a P0N network having multiple uplink channels, as shown in FIG. 2:

Step 202: Generate a correspondence between 0NU (identified by 0NU-ID) and a downlink channel (identified by DS-CID).

It should be noted that, generally, the uplink channel and the downlink channel in the P0N network refer to the complete logical channel of the data processing process between the ONU and the OLT in the uplink and downlink directions, but the line connection outside the 0NU to the 0LT In part, the uplink channel and the downlink channel in the embodiment of the present invention specifically refer to the processing channel of the uplink data and the downlink data in the 0LT.

Step 204: Generate correspondence table 2 of all ONUs, downlink channels, and uplink channels (identified by US-CIDs) according to the mapping relationship between the ONU and the downlink channels and the intrinsic binding relationship between the uplink channel and the downlink channel. ;

In the P0N system, the processing module in the 0LT is strictly bound to the processing channel (ie, the downlink channel and the uplink channel) of the downlink data and the uplink data, and the binding may be manually set or automatically mapped, because it is existing. Technology, no longer repeat here;

Therefore, according to the correspondence table 1 of all the 0NUs and the downlink channels, and the inherent binding relationship between the uplink channel and the downlink channel, a simple combination can determine the correspondence table 2 of all the 0NU, downlink channel, and uplink channel.

Step 206: When receiving the uplink data from the ONU, the 0LT, according to the identifier 0NU-ID of the ONU that sends the data included in the uplink data, or the DS_CID corresponding to the ONU-ID, or corresponds to the ONU-ID US-CID, determine the corresponding upstream channel;

If the uplink data includes a 0NU-ID or a DS-CID, the corresponding uplink channel is determined according to the correspondence table 2;

If the upstream data contains US-CID, the upstream channel can be directly determined.

Step 208: The OLT forwards the uplink data to the corresponding processing module for processing by using the uplink channel. Further, the correspondence table 1 of generating 0NU (identified by 0NU-ID) and downlink channel (identified by DS-CID) in step 202 may be automatically generated by 0LT in the 0NU registration phase;

The specific process includes: In the registration phase of the 0NU in the DSM-P0N system, the 0LT opens the registration window on all the uplink channels, and only sends a 0NU registration request to one downlink channel every time the window is registered, upon receiving A 0NU request response establishes a correspondence between the ONU and the downlink channel; after multiple registration windowing, all 0NU (identified by 0NU-ID) and downlink channel (identified by DS-CID) are generated. Correspondence table 1; Alternatively, the mapping between the 0NU (identified by the 0NU-ID) and the downlink channel (identified by the DS-CID) in the step 202 may also be preset in the 0LT according to the rule in advance, and the specific process includes: It is set to a fixed mapping relationship in advance by the 0NU-ID identifier and the downstream channel (identified by the DS-CID).

Between the step 204 and the step 206, the method further includes: transmitting, by the downlink channel corresponding to the ONU, the identifier DS-CID of the downlink channel or the identifier of the uplink channel corresponding to the downlink channel, the US-CID, to the ONU. The 0NU carries the DS-CID or US_CID in the transmitted uplink data.

The 0LT may define a DS-CID or a US-CID field in a downlink data frame header control field sent to the ONU. The 0NU may carry the received DS-CID or US-CID in the sent uplink data by using the following two types. Method mode: The reserved field in the existing uplink data frame structure, such as DS-CID or US-CID represented by 4 reserved bits in the Ind field, supports up to 16 downlink channels; or for each DS-CID or US The -CID defines a different upstream data frame delimiter, and the last 4 bits of the existing delimiter can be used to represent the DS-CID or US_CID.

The second embodiment of the present invention provides an 0LT. As shown in FIG. 3, the 0LT includes a control function module, an uplink function module, and a downlink function module.

The control function module is configured to generate a correspondence table 1 between the ONU (identified by the 0NU-ID) and the downlink channel (identified by the DS-CID); and generate all the ONUs according to the inherent binding relationship between the uplink channel and the downlink channel. The correspondence between the downlink channel and the uplink channel (identified by US-CID) is shown in Table 2;

It is further configured to determine, according to the identifier 0NU-ID of the ONU that sends the data included in the received uplink data, or the DS-CID corresponding to the ONU-ID, or the US-CID corresponding to the ONU-ID. Corresponding upstream channel;

The uplink function module is configured to receive uplink data, and forward the uplink data to the corresponding processing module for processing according to the uplink channel determined by the control function module;

The downlink function module is configured to send downlink data.

The control function module is further configured to control the downlink function module to open a registration window on all uplink channels during the registration phase of the ONU, and send a ONU registration request to only one downlink channel each time the window is registered; When the uplink function module receives a request response from the ONU, the control function module establishes a correspondence between the ONU and the downlink channel, and generates all the ONUs after multiple registrations to open the window (to 0NU- Correspondence relationship between ID ID) and downlink channel (identified by DS-CID);

Further, the control function module is further configured to update the correspondence table 2 after the 0NU offline is recovered;

The downlink function module is further configured to send, by using the downlink channel corresponding to the 0NU, the identifier DS-CID of the downlink channel or the identifier US-CID of the uplink channel corresponding to the downlink channel to the 0NU.

More specifically, as shown in FIG. 4, the uplink function module utilizes an uplink GEM frame receiving module (UGEMR module), A combination of an uplink GTC frame receiving module (UGTCR module) and a data receiving interface Rx; the downlink function module uses a downlink GEM frame sending module (DGEMT module), a downlink GTC frame sending module (DGTCT module), and a downlink device A combination of the connected data transmission interfaces Tx is implemented; it should be noted that, in practical applications, the control function modules can be integrated into the specific modules described above. Moreover, although only two sets of UGEMR1-2, UGTCR1_2, RxA-B, and DGEMTl-2, DGTCT 1-2, and TxA_B are used in the figure, they may be multiple sets. The specific processing is

The control function module controls to open the registration window on all uplink channels (upstream channel 1 and uplink channel 2), and only sends a 0NU registration request to one downlink channel each time the window is registered (for example, through downlink channel 1, from DGEMTl-> DGTCT1->TxA sends a registration request to the ONU); when the Rx receives a request response from the ONU, the control function module establishes a correspondence between the ONU (identified as 0NU1) and the downlink channel 1, after a plurality of The secondary registration window is opened, and the correspondence table 1 of all the ONUs and the downlink channels is generated, and the correspondence table 2 of all the 0NU, the downlink channel, and the uplink channel is generated according to the inherent binding relationship between the uplink channel and the downlink channel; Table 2 is shown in Table 1 below:

Table 1

The downlink data is sent to the downlink device 0NU1 by the TxA, and the RxA receives the uplink data of the 0NU1 as an example:

1. The TxA sends the downlink data to the 0NU1, where the downlink data includes the identifier DS-CID1 of the downlink channel 1 where the TxA is located, or the identifier US-CID1 of the uplink channel 1 corresponding to the downlink channel 1.

2. When the RxA receives the uplink data, the control function module according to the 0NU identifier 0NU (for example, 0NU-ID1) for transmitting the data included in the uplink data, or the downlink channel corresponding to the 0NU-ID (for example)

DS-CID1), or an uplink channel corresponding to the 0NU-ID (such as US-CID1), determining a corresponding uplink channel 1; it should be noted that when the control function module is based on the ONU that sends the data included in the uplink data The identifier 0NU (for example, 0NU-ID1) is used to determine the corresponding uplink channel 1; the downlink data in step 1 may not include DS-CID1 or identify US-CID1.

3. After RxA transfers the received uplink data to UGTCR1, UGTCR1 transfers the uplink data to the processing module UGEMR1 corresponding to the uplink channel 1 according to the uplink channel 1 determined by the control function module; It should be noted that, although the above is the downlink data sent by the TxA to the downlink device 0NU1, and the RxA receives the uplink data of the ONU1 as an example, in practice, the TxB may send the downlink data RxA to receive the uplink data, or the TxA transmit the downlink data RxB. Receiving uplink data, or TxB transmitting downlink data RxB receiving uplink data, the processing flow is similar to the above three steps.

In addition, the inventors also disclose a system in a P0N network having a plurality of uplink channels, including 0LT and a plurality of 0NUs, wherein the relationship between the two is as described in Embodiment 1 or Embodiment 2.

The above embodiment is described in the specific application scenario of the DSM-P0N, but the embodiment is also applicable to the P0N with multiple uplink channels, such as the hybrid PON (WDM/TDM-HP0N) of wavelength division multiplexing and time division multiplexing. The internet.

By using the solution proposed in this embodiment, the mapping between the ONU and the uplink channel is used for the forwarding and processing of the uplink data, so that the 0LT can recognize the uplink data transmitted by the ONU and correctly transfer it to the corresponding processing module for processing; Without the need to make changes in the system planning, the 0LT can recognize the uplink data transmitted by the 0NU and correctly transfer it to the corresponding processing module for processing, which is not only compatible, but also cost-effective.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary hardware platform, and of course, all can be implemented by hardware. Based on such understanding, all or part of the technical solution of the present invention contributing to the background art may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM, a magnetic disk, an optical disk, or the like. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Rights request

A signal processing method in a passive optical network PON network having multiple uplink channels, comprising:

The optical line terminal OLT generates the correspondence table 1 of the optical network unit ONU and the downlink channel; generates all ONUs, downlink channels, and uplinks according to the correspondence relationship between all ONU and downlink channels, and the inherent binding relationship between the uplink channel and the downlink channel. Correspondence table 2 of the channel;

When receiving the uplink data from the ONU, the 0LT is based on the identifier 0NU-ID of the ONU that transmits the data included in the uplink data, or the downlink channel identifier DS_CID corresponding to the ONU-ID, or corresponds to the ONU-ID. The uplink channel identifies the US-CID, and after determining the corresponding uplink channel, the uplink data is forwarded to the corresponding processing module through the uplink channel for processing;

The determining the corresponding uplink channel includes: if the uplink data includes the ONU-ID or the DS-CID, determining the corresponding uplink channel according to the correspondence table 2; if the uplink data includes the US-CID, directly determining the uplink aisle.

2. The method according to claim 1, wherein the correspondence table 1 is automatically generated by 0LT during the 0NU registration phase.

The method according to claim 2, wherein the process of automatically generating the correspondence table 1 by the 0LT during the 0NU registration phase comprises:

In the 0NU registration phase in the system, 0LT opens the registration window on all uplink channels, and only sends a 0NU registration request to one downstream channel every time the window is registered, and establishes the 0NU and the response when receiving a request response of 0NU. Corresponding relationship between the downlink channels; after cyclic registration windowing, all correspondence tables 1 of 0NU (identified by 0NU-ID) and downlink channels (identified by DS-CID) are generated.

The method according to claim 1, wherein the specific process of generating the correspondence table 1 between the 0NU and the downlink channel comprises: setting the 0NU and the downlink channel to a fixed mapping relationship in advance.

The method according to any one of claims 1 to 4, wherein after the OLT generates the correspondence table 2, the OLT sends the downlink to the ONU through a downlink channel corresponding to the ONU. Channel identification

The DS-CID or the identifier of the uplink channel corresponding to the downlink channel, US-CID; 0NU carries the DS-CID or US-CID in the sent uplink data.

An optical line terminal 0LT, wherein the 0LT includes a control function module, an uplink function module, and a downlink function module;

The control function module is configured to generate a correspondence table 1 of the optical network unit ONU and the downlink channel; The inherent binding relationship between the uplink channel and the downlink channel generates a correspondence table 2 of all the ONUs, the downlink channel, and the uplink channel; and according to the identifier 0NU-ID of the ONU that sends the data included in the received uplink data, Or determining a corresponding uplink channel by using a DS-CID corresponding to the ONU-ID or a US-CID corresponding to the ONU-ID; wherein if the uplink data includes a 0NU-ID or a DS-CID, according to the The correspondence table 2 determines the corresponding uplink channel; if the uplink data includes the US-CID, the uplink channel is directly determined;

The downlink function module is configured to send downlink data.

The OLT according to claim 6, wherein the control function module is further configured to control the downlink function module to open a registration window on all uplink channels during the registration phase of the ONU, and simultaneously When the secondary registration window is opened, only the 0NU registration request is sent to one downlink channel;

When the uplink function module receives a request response from the ONU, the control function module establishes a correspondence between the ONU and the downlink channel, and after generating multiple window registrations, generates all ONUs and downlink channels. Correspondence table 1.

The OLT according to claim 6, wherein the downlink function module further sends the identifier DS-CID of the downlink channel or the downlink channel to the ONU through a downlink channel corresponding to the ONU. The identifier of the corresponding upstream channel is US-CID.

The OLT according to any one of claims 6-8, wherein the uplink function module uses an uplink GEM frame receiving module UGEMR, an uplink GTC frame receiving module UGTCR, and a combination with a data receiving interface Rx. The downlink function module is implemented by using a combination of a downlink GEM frame sending module DGEMT, a downlink GTC frame sending module DGTCT module, and a data sending interface Tx for connecting with a downlink device.

A signal processing system, characterized in that the system comprises a plurality of optical network units 0NU and an optical line terminal 0LT according to any one of claims 6-8.

The plurality of 0NUs are connected to the 0LT.