CN108882063B - Service mapping method for asymmetric system of passive optical network - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0272—Transmission of OAMP information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0086—Network resource allocation, dimensioning or optimisation
Abstract
A service mapping method for an asymmetrical system of a passive optical network relates to the technical field of passive optical networks and comprises the following steps: the OLT establishes two types of tables, and the ONU downstream wavelength channel table records the number of downstream wavelength channels in each ONU and the corresponding channel number; the ONU characteristic table records the supported characteristics of each downlink wavelength channel of the ONU; the OLT inquires an ONU characteristic table and an ONU downlink wavelength channel table according to the required service, allocates a service type mark for the service and configures the mapping relation between the service type mark and the downlink wavelength channel; the OLT receives the uplink service data of the ONU, matches the uplink service data with the corresponding service type mark, and establishes the mapping relation between the uplink service data of the ONU and the corresponding downlink wavelength channel according to the mapping relation between the service type mark and the downlink wavelength channel. The invention establishes the mapping relation through establishing the channel, thereby ensuring the correct transmission of the uplink data and the downlink data and enabling the prior ODN network to normally bear the passive optical network asymmetric system.
Description
Technical Field
The invention relates to the technical field of passive optical networks, in particular to a service mapping method of a passive optical network asymmetric system.
Background
With the development of 5G mobile communication and the application of new services such as 4K/8K, users have increasingly demanded bandwidth, and a Passive Optical Network (PON) as an Optical access "last kilometer" needs to upgrade bandwidth of an existing PON Network. At present, a PON system mainly comprises an Optical Line Terminal (OLT), an Optical Distribution Network (ODN), and an Optical Network Unit (ONU), where a downlink adopts a broadcast mode, an uplink adopts a Time-division Multiplexing (TDM) mode to transmit signals, and the working wavelengths of the uplink and the downlink are paired, that is, the number of the working wavelengths of the uplink and the downlink is the same.
At present, there are two main ways for upgrading the bandwidth of the PON, one is to increase the number of wavelength channels, and the other is to increase the rate of a single wavelength channel. Increasing the number of wavelength channels undoubtedly requires more wavelength resources, and since the wavelength resources of the existing PON network are limited, increasing the number of wavelength channels in the uplink and downlink undoubtedly increases the system design difficulty and the construction, operation and maintenance cost of the network. The speed of the single wavelength channel is improved, higher requirements on bandwidth, isolation and the like of the optical device and the electric chip are provided, and the technical difficulty and the development cost of implementation are increased. Since PON networks are relatively cost sensitive and require sharing with existing ODNs, network economy is also a concern while optical access network bandwidth is upgraded. In addition, the existing fixed broadband user has a large demand for downlink bandwidth, and the demand for uplink bandwidth is relatively small, that is, the requirement for broadband of the optical access network is asymmetric, so that the capacity expansion of the optical access network system mainly needs to improve the downlink bandwidth.
Based on the above, the asymmetric system of the passive optical network is a better solution, and the system capacity can be improved by increasing the number of downlink long-path channels, so as to provide a higher downlink system bandwidth for users.
In the existing symmetric passive optical Network system, one uplink wavelength channel has a corresponding associated downlink wavelength channel, data sent from a Network to Network Interface (NNI) to the system has an explicit corresponding downlink data port (downlink wavelength channel) for forwarding, and a user-side destination address of the downlink data is confirmed in the data port through an uplink data source.
In the passive optical network asymmetric system, each ONU has only one uplink wavelength channel, and all uplink data is sent to the OLT through the uplink wavelength channel. However, at least one downstream wavelength channel of an ONU is provided, and when there is more than one downstream wavelength channel, the OLT cannot find a corresponding downstream data port from the upstream data, so that the OLT sends the data downstream to the ONU, and cannot correctly find a corresponding downstream wavelength channel in the ONU, and further cannot guarantee correct transmission of the data upstream and downstream, which results in that a passive optical network asymmetric system cannot realize normal service loading in the existing ODN network.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a service mapping method for a passive optical network asymmetric system, wherein a plurality of virtual uplink wavelength channels are formed in the system and correspond to actual downlink wavelength channels one by one, and the mapping relation of the wavelength channels is established, so that the correct transmission of uplink data and downlink data is ensured, and the conventional ODN normally bears the passive optical network asymmetric system.
In order to achieve the above purpose, the present invention adopts a service mapping method for a passive optical network asymmetric system, which comprises the following steps:
the OLT establishes two types of tables which are an ONU downlink wavelength channel table and an ONU characteristic table respectively; the ONU downlink wavelength channel table records the number of downlink wavelength channels and corresponding channel numbers in each ONU; the ONU characteristic table records the supported characteristics of each downlink wavelength channel of the ONU;
the OLT opens a service according to the system requirement, an ONU characteristic table and an ONU downlink wavelength channel table are inquired, an ONU downlink wavelength channel matched with the service is found, the OLT distributes a service type mark for the service, and the mapping relation between the service type mark and the downlink wavelength channel is configured;
the OLT receives the uplink service data of the ONU, matches the uplink service data with the corresponding service type mark, and establishes the mapping relation between the uplink service data of the ONU and the corresponding downlink wavelength channel according to the mapping relation between the service type mark and the downlink wavelength channel.
On the basis of the technical scheme, the characteristics supported by each downlink wavelength channel of the ONU are divided into two stages: the first level is the service type and/or PON characteristics; the second level is a specific characteristic value of each service type and/or a specific characteristic value of PON characteristics; and the number of the ONU characteristic tables is at least one.
On the basis of the technical scheme, the service types are divided into voice service, multicast service and data service; and the service type and the PON characteristics respectively define the mapping relation with the downlink wavelength channel, or the service type and the PON characteristics define the mapping relation with the downlink wavelength channel.
On the basis of the technical scheme, the service type is a data service, and the second-level specific characteristic values of the service type comprise a source MAC address, a destination MAC address, an Ethernet type, a VLAN value, a QinQ value, a priority value, an ip address value and a port number value; and the specific characteristic values jointly or independently define the mapping relation with the downlink wavelength channel.
On the basis of the technical scheme, the service type is a voice service, and the second-level specific characteristic values of the service type comprise a connection mode, a voice type, a VLAN value, a QinQ value, a priority value, an ip address value and a port number value; and the specific characteristic values jointly or independently define the mapping relation with the downlink wavelength channel.
On the basis of the technical scheme, the service type is multicast service, and the specific characteristic values of the second level comprise a source MAC address, a multicast group address, an Ethernet type, a VLAN value, a QinQ value, a priority value, an ip address value and a port number value; and the specific characteristic values jointly or independently define the mapping relation with the downlink wavelength channel.
On the basis of the technical scheme, the specific characteristic values of the PON characteristics comprise ALLOC ID, ONUID and GEMPORT ID or LLID; and the specific characteristic values jointly or independently define the mapping relation with the downlink wavelength channel.
On the basis of the technical scheme, the method further comprises the following steps:
the OLT receives a downlink data packet from a network side, and obtains at least one corresponding downlink wavelength channel according to the mapping relation between the service type mark and the downlink wavelength channel and the first-level characteristics of the downlink data packet;
when there is more than one corresponding downlink wavelength channel, obtaining at least one corresponding downlink wavelength channel again according to the second-level characteristics of the downlink data packet;
and when more than one downlink wavelength channel is obtained again, selecting the downlink wavelength channel with the maximum residual bandwidth capacity to forward the downlink data packet.
On the basis of the technical scheme, the OLT periodically sends management messages requiring the registration of the ONUs through all the downlink wavelength channels, after the unregistered ONUs receive the registration management messages, response messages are replied, and the response messages report the number and the serial number of the downlink wavelength channels supported by the ONUs and the characteristics supported by each wavelength channel; and the OLT generates the ONU characteristic table and the ONU downlink wavelength channel table according to the ONU reported content.
On the basis of the technical scheme, after the ONU is unregistered, the channel mapping relation between the virtual channel of the uplink service data of the ONU and the corresponding downlink wavelength channel is released.
The invention has the beneficial effects that:
the OLT establishes two types of tables according to the registered ONUs, wherein one type of table is an ONU downstream wavelength channel table, the other type of table is an ONU characteristic table, at least one ONU characteristic table is arranged, and the ONU downstream wavelength channel table records the number of downstream wavelength channels in each ONU and the corresponding channel number; and the ONU characteristic table records the supported characteristics of each downlink wavelength channel of the ONU. And the OLT allocates a service type mark for the service according to the two types of tables and configures the mapping relation between the service type mark and the downlink wavelength channel.
The OLT receives user side data (namely service data) from the ONU to obtain a matched service type mark, and establishes a mapping relation between uplink service data and a corresponding downlink wavelength channel according to the mapping relation between the service type mark and the downlink wavelength channel. The uplink service data can be regarded as data sent by the virtual uplink wavelength channel of the ONU, and the subsequent ONU forwards the received network side data to the user side through the downlink wavelength channel corresponding to the ONU according to the mapping relation between the uplink service data and the corresponding downlink wavelength channel.
Therefore, the correct transmission of the uplink data and the downlink data can be ensured, and the conventional ODN can normally bear the passive optical network asymmetric system.
Furthermore, the OLT may be one upstream wavelength channel or a plurality of upstream wavelength channels; when the OLT is a plurality of uplink wavelength channels, it can be regarded as a simple superposition of a system where a plurality of uplink wavelength channels OLT are located.
Similarly, in the method of the present invention, not only the ONU and the service disclosed in the embodiment are limited, but also the OLT may establish a service mapping relationship for other ONUs and other services, and forward the uplink service and the downlink service, and the application range is wide.
Drawings
FIG. 1 is a flow chart of a first embodiment of the present invention;
fig. 2 is a schematic diagram of a passive optical network asymmetric system based on a third embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
First embodiment
As shown in fig. 1, the method for mapping services of an asymmetric passive optical network system of the present invention includes the following steps:
s101, the OLT supports the number and the serial number of the downlink wavelength channels according to the self support reported by the ONU and the characteristics supported by each wavelength channel; and establishing two types of tables, wherein one type is an ONU downlink wavelength channel table, the other type is an ONU characteristic table, and the number of the ONU characteristic tables is at least one. And the ONU downstream wavelength channel table records the number of downstream wavelength channels and corresponding channel numbers in each ONU. And the ONU characteristic table records the supported characteristics of each downlink wavelength channel of the ONU.
And S102, carrying out service configuration by the OLT. Specifically, the OLT queries the ONU feature table and the ONU downlink wavelength channel table according to a service (which is to be opened by the system through a network management or other means) to find an ONU downlink wavelength channel matching the service, and allocates a service type label to the service to label the service type and configure a mapping relationship between the service type label and the downlink wavelength channel.
And S103, establishing a data mapping relation by the OLT. Specifically, the OLT receives user-side data, that is, uplink service data from the ONU, and matches the corresponding service type flag; and the OLT establishes the mapping between the uplink service data of the ONU and the corresponding downlink wavelength channel according to the mapping relation between the configured service type mark and the downlink wavelength channel.
Second embodiment
On the basis of the first embodiment, specifically, the features supported by each downstream wavelength channel of an ONU are divided into two stages:
the first level is the service type and/or PON characteristics;
the second level is a specific characteristic value of each service type and/or a specific characteristic value of PON characteristics;
the service type and the PON feature may respectively define a mapping relationship with the downlink wavelength channel, or the service type and the PON feature may define a mapping relationship with the downlink wavelength channel. The first-level service types are classified into voice service, multicast service, and data service.
The first-stage service type is data service (unicast data packet), and the specific characteristic values of the second stage include specific characteristic values which can be extracted from any data packet such as source MAC address, destination MAC address, ethernet type, VLAN value, QinQ value, priority value, ip address value, port number value and the like. These specific eigenvalues may jointly or independently define a mapping relationship with the downstream wavelength channel.
The first-stage service type is a voice service (voice data packet), and the specific characteristic value of the second stage comprises service characteristics which can be extracted by any data packet such as a connection mode, a voice type, a VLAN value, a QinQ value, a priority value, an ip address value, a port number value and the like. The specific characteristic values jointly or independently define the mapping relation with the downlink wavelength channel.
The first-stage service type is multicast service (multicast data packet), and the specific characteristic value of the second stage comprises service characteristics which can be extracted by any data packet, such as source MAC address, multicast group address, Ethernet type, VLAN value, QinQ value, priority value, ip address value, port number value and the like. The specific characteristic values jointly or independently define the mapping relation with the downlink wavelength channel.
Specific feature values of the first-level PON features comprise ALLOC ID, ONU ID and GEMPORT ID or LLID; the specific characteristic values jointly or independently define the mapping relation with the downlink wavelength channel. Each ONU has an ONU ID as a unique identifier of the ONU in the system, for example, the ONU ID of ONU1 is 1; the ONU ID of ONUi is i. When the system provides the service to the ONU, the OLT also assigns a mark to the service of the ONU, and the mark is used for marking the service. In the GPON mode, the OLT allocates a GEMPORT ID; in the EPON mode, the OLT allocates an LLID; the GEMPORT ID or LLID of all ONUs is not duplicated. The occupied GEMPORT ID or LLID can be inquired through the ONU ID, and the ONU ID to which the resource belongs can also be inquired through the GEMPORT ID or LLID.
Third embodiment
As shown in fig. 2, the passive optical network asymmetric system based on this embodiment includes an OLT, and the OLT communicates with a plurality of ONUs through an ODN network. The OLT mainly comprises a first MAC and logic control module and an OLT optical module, wherein the first MAC and logic control module is used for link control; the OLT optical module is used for combining network side data on a single mode fiber in a downlink direction and transmitting the data to the ODN network through the single mode fiber; the OLT optical module is used for transmitting an optical signal from the single-mode optical fiber to the first MAC and logic control module in the uplink direction.
In this embodiment, the OLT optical module supports one upstream wavelength channel (hereinafter, referred to as RX) and two downstream wavelength channels, which are respectively denoted as a downstream wavelength channel TX1 and a downstream wavelength channel TX 2. Wherein the uplink wavelength is lambda, the range of the uplink wavelength is 1260nm-1280nm, and the central wavelength of the uplink wavelength is 1270 nm; the downlink wavelength is divided into lambda 1 and lambda 2, the lambda 1 is 1480nm to 1500nm, and the central wavelength is 1490 nm; lambda 2 is 1575nm-1580nm, and the central wavelength is 1577 nm. In other embodiments, the OLT optical module may also support multiple upstream wavelength channels.
Each ONU comprises a second MAC and logic control module for link control and transmission of optical signals. In this embodiment, the ONU1 supports one upstream wavelength channel TX and one downstream wavelength channel RX1, and the ONUi supports one upstream wavelength channel TX and two downstream wavelength channels, which are respectively denoted as a downstream wavelength channel RX1 and a downstream wavelength channel RX 2. Specifically, the uplink wavelengths of the ONU1 and the ONUi are λ, the downlink wavelength received by the ONU1 downlink wavelength channel RX1 is λ 1, the downlink wavelength received by the downlink wavelength channel RX1 in the ONUi is λ 1, and the downlink wavelength received by the downlink wavelength channel RX2 is λ 2. In different ONUs, the downstream wavelength channels having the same reception wavelength are the same, and for example, the downstream wavelength channels RX1 all receive the same downlink wavelength λ 1.
On the basis of the second embodiment, in the method of the present embodiment, before step S101, the OLT periodically performs a discovery registration process of the ONU. That is, the OLT periodically transmits a management message requesting ONU registration through all downstream wavelength channels.
After receiving the management message issued by the OLT, the unregistered ONU replies a response message to the OLT, and the ONU reports the number and the serial number of the downlink wavelength channels supported by the ONU and the characteristics supported by each wavelength channel in the response message.
As shown in fig. 2, for example: ONU1 supports single downstream wavelength channel RX1, receives management messages from OLT from downstream wavelength channel RX1, and ONU1 sends response messages to report that ONU1 supports downstream wavelength channel RX1, and indicates that downstream wavelength channel RX1 supports voice traffic and all data traffic. And after receiving the management message from the OLT, the ONUi sends a response message and reports that the ONUi supports a downlink wavelength channel RX1 and a downlink wavelength channel RX2, the downlink wavelength channel RX1 supports voice and single VLAN data services, and the downlink wavelength channel RX2 supports double-layer VLAN data services.
The OLT establishes an ONU characteristic table and an ONU downlink wavelength channel table according to the content reported by the ONU; and registers the ONU. For example: in the ONU downlink wavelength channel table, the number of downlink channels of ONU1 is recorded as 1, and the channel number is RX 1; the number of downlink channels of ONUi is 2, and the channel numbers are RX1 and RX 2. In the ONU feature table, it is recorded that the downstream channel RX1 of the ONU1 supports voice services and all data services; the downlink channel RX1 of ONUi supports voice and single VLAN data traffic, and the downlink wavelength channel RX2 supports dual-layer VLAN data traffic.
Fourth embodiment
On the basis of the third embodiment, taking allocation of a GEMPORT ID by the OLT as an example, as shown in fig. 2, the performing, by the OLT, service configuration specifically includes:
the ONU1 is configured for single VLAN data traffic. After receiving the corresponding configuration, the OLT queries the ONU feature table and the ONU downlink wavelength channel table to find the ONU1 downlink wavelength channel RX1 matching the service, and the OLT assigns a GEMPORT ID of 1024 to mark the service. The OLT establishes a wavelength channel mapping relation, namely: the ONU1 marks the GEMPORT ID as 1024 corresponding to the service type of the single VLAN data, and the downlink wavelength channel RX 1.
The OLT receives and configures the ONUi voice service, inquires the ONU characteristic table and the ONU downstream wavelength channel table, finds the ONUi downstream wavelength channel RX1 matched with the service, and assigns a GEMPORT ID of 1025 to mark the service. The OLT establishes a channel mapping relationship, namely: the corresponding service type label GEMPORT ID of ONUi voice service is 1025, and the downstream wavelength channel RX 1.
The OLT receives and configures ONUi double-layer VLAN service, inquires an ONU characteristic table and an ONU downstream wavelength channel table, finds an ONUi downstream wavelength channel RX2 matched with the service, and assigns a GEMPORT ID of 1026 to mark the service. The OLT establishes a channel mapping relationship, namely: the corresponding service type mark GEMPORT ID of ONUi double-layer VLAN service is 1026, and the downlink wavelength channel RX2 is adopted.
Fifth embodiment
On the basis of the fourth embodiment, after the ONU replies the response message, the OLT registers the ONU, and after the OLT performs service configuration, the OLT receives an uplink service data packet from the ONU, records data characteristics in the uplink service data packet, and obtains a matched service type flag, and the OLT obtains a downlink wavelength channel corresponding to the uplink service data according to a mapping relationship between the service type flag and the downlink wavelength channel.
And then establishing a mapping relation between the uplink service data and the corresponding downlink wavelength channel, wherein the source of the uplink service data can be regarded as a virtual uplink service channel, the mapping relation is stored in the OLT, the mapping relation is kept unchanged during the existence of service configuration, and the OLT uses the mapping relation to finish uplink and downlink forwarding of the service data. And after the ONU is unregistered, the mapping relation between the virtual uplink channel of the uplink service data of the ONU and the corresponding downlink wavelength channel is released.
In the ONU registration process, the OLT acquires the number of the downlink wavelength channels supported by the ONU and the serial number of the corresponding downlink wavelength channel, and also has the characteristic that the ONU supports the downlink wavelength channels. The OLT may know that the data from the upstream wavelength channel is downstream of the possible transmitting wavelength channels. For an ONU supporting a single downlink wavelength channel, only a unique wavelength channel exists for uplink and downlink, so the OLT can establish a mapping relationship between an uplink data channel and a downlink wavelength channel of the ONU.
For the ONU supporting a plurality of downlink wavelength channels, the uplink and downlink channels are in a one-to-many relationship, the OLT only records the serial numbers of the possible downlink wavelength channels and does not establish a channel mapping relationship between the uplink data channel and the downlink wavelength channel. When configuring service, according to the matching of service and ONU downstream wavelength channel support service characteristics, determining the downstream wavelength channel corresponding to the ONU service, at this time, establishing the service upstream virtual channel, mapping with the corresponding downstream wavelength channel, and forwarding the service data upstream and downstream based on the mapping relation.
Sixth embodiment
Based on the fifth embodiment, taking ONUi as an example, the OLT receives service data at the user side as dual-VLAN data, records characteristics of the data packet, such as a source MAC address and a dual-VLAN value of the user, and obtains a GEMPORT ID according to the service of the data packet, and if the GEMPORT ID is 1026, the OLT obtains a corresponding downstream wavelength channel RX2 according to mapping configured by the service. Here, the OLT may generate a service mapping table, and store the mapping contents, where the contents in the service mapping table include a destination MAC address, a dual VLAN value, a GEMPORT ID of 1026, an ONU ID of i, and a downstream wavelength channel RX 2.
Seventh embodiment
On the basis of the sixth embodiment, when the OLT receives a downlink data packet (service data packet) on the network side, the method for finding a downlink wavelength channel for the OLT includes:
and obtaining a service type mark according to the content of the data packet, and obtaining at least one corresponding downlink wavelength channel according to the mapping relation between the service type mark and the downlink wavelength channel and the first-stage characteristics of the downlink data packet. At this time, if there is only one downstream wavelength channel, the packet is forwarded through the downstream wavelength channel.
And if the corresponding downlink wavelength channel is not more than one, obtaining at least one corresponding downlink wavelength channel again according to the second-level characteristics of the downlink data packet. And when more than one downlink wavelength channel is obtained again, selecting the downlink wavelength channel with the maximum residual bandwidth capacity to forward the downlink data packet.
Eighth embodiment
On the basis of the seventh embodiment, when the OLT receives a service data packet from the network side, if the source MAC address and the dual VLAN value in the service data packet are the same as the source MAC address and the dual VLAN value in the ONU uplink service data packet (which may be determined by mapping or by looking up a service mapping table), it indicates that the data packet from the network side configures a service type tag that is the same as the ONU uplink service data packet, and forwards the service type tag to the user side through the corresponding downlink wavelength channel. For example, when the OLT receives a packet from the network side and finds the mapping table of the service, the GEMPORT ID is 1026, and then the service packet can be forwarded to the user side through the downstream wavelength channel RX2 of the ONUi.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. A service mapping method for a passive optical network asymmetric system is characterized by comprising the following steps:
the OLT establishes two types of tables which are an ONU downlink wavelength channel table and an ONU characteristic table respectively; the ONU downlink wavelength channel table records the number of downlink wavelength channels and corresponding channel numbers in each ONU; the ONU characteristic table records the supported characteristics of each downlink wavelength channel of the ONU;
the OLT opens a service according to the system requirement, an ONU characteristic table and an ONU downlink wavelength channel table are inquired, an ONU downlink wavelength channel matched with the service is found, the OLT distributes a service type mark for the service, and the mapping relation between the service type mark and the downlink wavelength channel is configured;
the OLT receives the uplink service data of the ONU, matches the uplink service data with the corresponding service type mark, and establishes a mapping relation between the uplink service data of the ONU and the corresponding downlink wavelength channel according to the mapping relation between the service type mark and the downlink wavelength channel, wherein:
the features supported by each downstream wavelength channel of the ONU include a traffic type and/or PON features.
2. The passive optical network asymmetric system service mapping method of claim 1, wherein the features supported by each downstream wavelength channel of the ONU are divided into two stages:
the first level is the service type and/or PON characteristics;
the second level is a specific characteristic value of each service type and/or a specific characteristic value of PON characteristics;
and the number of the ONU characteristic tables is at least one.
3. The passive optical network asymmetric system service mapping method of claim 2, characterized in that: the service types are divided into voice service, multicast service and data service; and the service type and the PON characteristics respectively define the mapping relation with the downlink wavelength channel, or the service type and the PON characteristics define the mapping relation with the downlink wavelength channel.
4. The passive optical network asymmetric system service mapping method of claim 3, characterized in that: the service type is data service, and the second-stage specific characteristic value comprises a source MAC address, a destination MAC address, an Ethernet type, a VLAN value, a QinQ value, a priority value, an ip address value and a port number value; and the specific characteristic values jointly or independently define the mapping relation with the downlink wavelength channel.
5. The passive optical network asymmetric system service mapping method of claim 3, characterized in that: the service type is a voice service, and the second-level specific characteristic value comprises a connection mode, a voice type, a VLAN value, a QinQ value, a priority value, an ip address value and a port number value; and the specific characteristic values jointly or independently define the mapping relation with the downlink wavelength channel.
6. The passive optical network asymmetric system service mapping method of claim 3, characterized in that: the service type is multicast service, and the second-level specific characteristic value comprises a source MAC address, a multicast group address, an Ethernet type, a VLAN value, a QinQ value, a priority value, an ip address value and a port number value; and the specific characteristic values jointly or independently define the mapping relation with the downlink wavelength channel.
7. The passive optical network asymmetric system service mapping method of claim 3, characterized in that: specific feature values of the PON features comprise ALLOC ID and ONUID, and GEMPORT ID or LLID; and the specific characteristic values jointly or independently define the mapping relation with the downlink wavelength channel.
8. The passive optical network asymmetric system traffic mapping method of claim 2, the method further comprising:
the OLT receives a downlink data packet from a network side, and obtains at least one corresponding downlink wavelength channel according to the mapping relation between the service type mark and the downlink wavelength channel and the first-level characteristics of the downlink data packet;
when there is more than one corresponding downlink wavelength channel, obtaining at least one corresponding downlink wavelength channel again according to the second-level characteristics of the downlink data packet;
and when more than one downlink wavelength channel is obtained again, selecting the downlink wavelength channel with the maximum residual bandwidth capacity to forward the downlink data packet.
9. The passive optical network asymmetric system service mapping method of claim 1, characterized in that: the OLT periodically sends management messages requiring ONU registration through all downlink wavelength channels, after the unregistered ONU receives the registration management messages, a response message is replied, and the response message reports the number and the serial number of downlink wavelength channels supported by the ONU and the characteristics supported by each wavelength channel; and the OLT generates the ONU characteristic table and the ONU downlink wavelength channel table according to the ONU reported content.
10. The passive optical network asymmetric system service mapping method of claim 9, characterized in that: and after the ONU is unregistered, the channel mapping relation between the virtual channel of the uplink service data of the ONU and the corresponding downlink wavelength channel is released.
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| CN110505540B (en) * | 2019-07-11 | 2021-06-29 | 中国联合网络通信集团有限公司 | Method and device for judging PON port expansion priority |
| CN115967873A (en) * | 2021-10-09 | 2023-04-14 | 华为技术有限公司 | Optical communication method, apparatus, system and storage medium |
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