CN101621452A - Passive optical network system, optical line terminal and optical network units - Google Patents
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Abstract
The invention discloses a passive optical network system, an optical line terminal, optical network units, a method for generating bandwidth mapping information and a method for processing the bandwidth mapping information. When implemented, the system can allow a plurality of ONUs using different uplink wavelengths to synchronously transmit uplink data during the same time period, thereby making full use of the uplink bandwidth of a GPON system, meeting demands of a user for uplink bandwidth and avoiding serious uplink bandwidth waste caused when a dynamic bandwidth distributing mechanism of the prior GPON system is applied to a multi-wavelength uplink GPON system.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a passive optical network system, an optical line terminal, an optical network unit, a method for generating bandwidth mapping information, and a method for processing bandwidth mapping information.
Background
With the increasing abundance of telecommunication services, users have an increasing demand for access bandwidth; among various access technologies, operators of various countries around the world have a great bandwidth and are suitable for long-distance transmission, and therefore, Fiber To The Home (FTTH) is a necessary choice for access networks. In the specific implementation of FTTH, Passive Optical Network (PON) technology is currently adopted in many cases.
Fig. 1 is a network diagram of a PON network. The PON adopts a point-to-multipoint architecture, in which signal transmission in a direction from an Optical Line Terminal (OLT) to an Optical Network Unit (ONU) is called downstream; the signal transmission from the ONU to the OLT is called upstream; the downlink direction is broadcast, while the uplink direction is unicast.
The PON can be divided into many kinds according to different specific technologies, wherein a Gigabit Passive Optical Network (GPON) has a higher bandwidth rate, and its synchronization timing mechanism follows a conventional Synchronous Digital Hierarchy (SDH) and can adapt to services with different rates, so that the PON becomes an attractive access system for telecommunication operators in various countries.
In a point-to-multipoint network architecture based on GPON, an OLT needs to communicate with a plurality of ONUs at the same time, and in order to distinguish different ONUs, a unique ONU-ID is required to be set for each ONU to serve as an identification of the ONU; meanwhile, each ONU may carry a plurality of different types of user services, and in order to distinguish different services, when a gigabit passive optical network encapsulation Method (GEM) is used to encapsulate service data, a GEM-port ID is used for identification.
Because a plurality of ONUs send data to the OLT at the same time, signal collision may be caused, and normal sending of the OLT is affected, the OLT needs to coordinate sending of the ONUs in a time slice authorization manner, so that only one ONU is allowed to send data in a certain time period, and thus collision can be effectively avoided. In addition, in order to ensure Qos of different services on the ONU, a plurality of allocation units need to be set, each allocation unit corresponds to a service flow with the same traffic characteristics, so that an authorization object of the OLT is an allocation unit on the ONU, and is identified by using an Alloc-ID.
With the continuous expansion of user scale and the increasing demand of users for bandwidth, the existing GPON system with downlink 2.5Gbps and uplink 1.25G bps is difficult to meet the requirements, so that the uplink and downlink bandwidth needs to be improved.
The Full Service Access Network (FSAN) white paper suggests that 10G bps is adopted for downlink transmission, and considering that the difficulty of implementing burst transmission and burst reception above 5G bps is high, the device cost is high, the stability is poor, while the burst transmission and burst reception of 2.5G bps are easy to implement, and meanwhile, the existing mature devices can be partially reused, so that 2.5G bps can be adopted for uplink, in order to increase the uplink bandwidth, the number of used uplink wavelengths can be increased, each wavelength bears the uplink rate of 2.5G bps, that is, the uplink bandwidth of each ONU is increased by reducing the number of ONUs borne by a single wavelength.
FIG. 2 is a diagram of a downstream 10G bps and upstream N × 2.5G bps architecture as described in FSAN NGA1 white paper; if symmetry between the uplink and downlink is required, the uplink may be 4 × 2.5G.
According to the architecture shown in fig. 2, ONUs using different upstream wavelengths can simultaneously transmit upstream data, and the existing Dynamic Bandwidth Allocation (DBA) mechanism is based on a single upstream wavelength, and time slices allocated to the ONUs are not allowed to overlap, so that only one upstream wavelength is allowed to transmit data in the same time period, and other upstream wavelengths are idle, which causes a great waste of upstream bandwidth resources. In addition, according to the existing processing method, each ONU at the upstream wavelength also needs to resolve bandwidth map (BWMap) information of ONUs belonging to other wavelengths, thereby causing additional processing overhead and unnecessary system power consumption.
Disclosure of Invention
The invention aims to provide a passive optical network system, an optical line terminal, an optical network unit, a bandwidth mapping information generating method and a bandwidth mapping information processing method, thereby allowing a plurality of ONUs using different upstream wavelengths to simultaneously transmit upstream data and fully utilizing the upstream bandwidth of a GPON system.
The embodiment of the invention provides a passive optical network system, which comprises an Optical Line Terminal (OLT) and an Optical Network Unit (ONU); wherein,
the OLT is used for acquiring uplink bandwidth requirements of at least one ONU, respectively allocating bandwidths for different uplink wavelengths, and respectively generating bandwidth mapping (BWMap) information corresponding to the different uplink wavelengths and based on a single wavelength; generating multi-wavelength-based BWMap information according to the single-wavelength-based BWMap information corresponding to different upstream wavelengths and the wavelength information of the different upstream wavelengths; carrying the BWMap information based on the multi-wavelength in a gigabit passive optical network transmission convergence GTC frame, and sending the GTC frame to an ONU;
the ONU is used for receiving the GTC frame and analyzing the BWMap information based on the multi-wavelength; and filtering the BWMap information based on the multi-wavelength to obtain BWMap information related to the upstream wavelength used by the ONU.
The embodiment of the invention also provides an optical line terminal, which comprises a multi-wavelength bandwidth mapping BWmap information generation module, a gigabit passive optical network transmission convergence GTC frame generation module and at least two dynamic bandwidth allocation DBA control modules;
the DBA control module is used for generating single-wavelength-based BWmap information according to the uplink bandwidth requirement of at least one optical network unit and sending the single-wavelength-based BWmap information to the multi-wavelength BWmap information generation module;
the multi-wavelength BWMap information generating module receives the BWMap information based on single wavelength from each DBA control module, combines the BWMap information based on single wavelength with the uplink wavelength information corresponding to each BWMap information based on single wavelength to generate BWMap information based on multi-wavelength, and sends the BWMap information based on multi-wavelength to the GTC frame generating module;
the GTC frame generation module is used for multiplexing the BWMap information based on multi-wavelength into a GTC frame according to the BWMap information based on multi-wavelength, and sending the GTC frame.
An embodiment of the present invention further provides an optical network unit, where the optical network unit ONU includes: the system comprises a gigabit passive optical network transmission convergence GTC frame analysis module and a bandwidth mapping BWmap information filtering module; wherein,
the GTC frame analyzing module is used for receiving a GTC frame from an optical line terminal, analyzing the GTC frame and analyzing BWmap information based on multiple wavelengths; sending the BWMap information based on multi-wavelength to the BWMap information filtering module;
the BWMap information filtering module is configured to filter the BWMap information based on multiple wavelengths to obtain BWMap information related to an upstream wavelength of the ONU.
The embodiment of the invention also provides a method for generating bandwidth mapping information, which comprises the following steps:
acquiring uplink bandwidth requirements of at least one optical network unit, respectively performing bandwidth allocation aiming at different wavelengths, and respectively generating bandwidth mapping (BWmap) information corresponding to the different wavelengths and based on single wavelength;
generating multi-wavelength-based BWMap information according to the single-wavelength-based BWMap information corresponding to the different wavelengths and the wavelength information corresponding to the different wavelengths;
and carrying the BWMap information based on the multi-wavelength in a GTC frame of kilomega passive optical network transmission convergence, and sending the GTC frame.
The embodiment of the invention also provides a method for processing bandwidth mapping information, which comprises the following steps:
receiving a gigabit passive optical network transmission convergence (GTC) frame from an optical line terminal, wherein the GTC frame carries multi-wavelength-based BWmap information;
analyzing the GTC frame to obtain the BWMap information based on the multi-wavelength;
and filtering the BWMap information based on the multi-wavelength to obtain BWMap information related to the upstream wavelength used by the ONU.
The invention has the beneficial effects that:
by implementing the embodiment of the invention, a plurality of ONUs with different uplink wavelengths can be allowed to simultaneously send uplink data in the same time period, the uplink bandwidth of the GPON system is fully utilized, the requirement of a user on the uplink bandwidth is met, and the serious waste of the uplink bandwidth caused when the dynamic bandwidth allocation mechanism of the existing GPON system is applied to the GPON system with multiple wavelengths and uplink is avoided.
In addition, in the GPON system with the uplink of multiple wavelengths, the processing amount of BWmap information by the ONU can be reduced and unnecessary power consumption can be reduced by implementing the embodiment.
Drawings
FIG. 1 is a networking diagram of a PON network;
fig. 2 is the architecture described in FSAN NGA1 white paper;
FIG. 3 is a flow chart of an embodiment of the method of the present invention;
fig. 4 is a format of a conventional GTC frame;
fig. 5 is a format of a GTC frame in an embodiment of the present invention;
FIG. 6 is a system diagram of an embodiment of the present invention;
fig. 7 is a structural diagram of an optical line terminal according to an embodiment of the present invention;
fig. 8 is a structural diagram of an optical network unit according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 3 shows a flow of an embodiment of the method of the invention, comprising the steps of:
301, in a GPON system with uplink at multiple wavelengths, an OLT acquires uplink bandwidth requirements of at least one ONU, performs bandwidth allocation for different uplink wavelengths, and generates corresponding BWMap information based on a single wavelength; and combining the plurality of pieces of single-wavelength-based BWMap information according to the single-wavelength-based BWMap information and the wavelength information of the different upstream wavelengths to generate multi-wavelength-based BWMap information.
In this embodiment of the present invention, the method for acquiring the uplink bandwidth requirement of the ONU includes: receiving an uplink Dynamic Bandwidth Report (DBRu, Dynamic Bandwidth Report upstream) based on different wavelengths; or, carrying out Idle byte statistics based on different wavelengths; wherein, the DBRu is a dynamic bandwidth uplink report, and the field records the uplink bandwidth required by the ONU; when bandwidth allocation is performed, each DBA control module performs bandwidth allocation on a single wavelength basis, that is, only a plurality of ONUs sharing the same upstream wavelength are coordinated to access in a TDMA manner, and accordingly, each DBA control module generates BWMap information also based on the single wavelength.
In this embodiment of the present invention, the OLT may obtain the wavelength information of each uplink wavelength by querying the ONU registry.
Step 302, generating a GTC (GTC, Gigabit PON Transmission Convergence) frame carrying the BWMap information based on multiple wavelengths, and sending the GTC frame to an ONU;
303, receiving, by the ONU, a GTC frame from the OLT, analyzing the GTC frame, and obtaining the BWMap information based on multiple wavelengths; filtering the BWMap information related to the ONU with other wavelengths, obtaining the BWMap information related to the uplink wavelength used by the ONU, and analyzing the BWMap information; after the filtering process, the BWMap information obtained by the filtering process may be sent to a DBA control module in the ONU, and the DBA control module performs subsequent bandwidth processing, for example: and resolving the BWMap information, and reading the specific time slot from the BWMap information so as to control the transmission of the uplink data.
And step 304, the ONU transmits the upstream data in the designated time slot through the GTC frame according to the filtered BWMap information, that is, according to the bandwidth allocation of the OLT.
Fig. 4 shows a format of a conventional gigabit pon transmission aggregation frame. In order to solve the problems in the prior art, dynamic bandwidth allocation needs to be performed based on multiple wavelengths, so that multiple ONUs using different uplink wavelengths can simultaneously transmit uplink data, and the uplink bandwidth advantage of a multi-wavelength uplink GPON system is fully exerted. The embodiment of the present invention modifies the relevant fields in the GTC frame shown in fig. 4, and the modified frame structure is shown in fig. 5. The main improvement is that a wavelength number field is added in a PCBd field of a GTC frame to indicate the number of wavelengths used in uplink in the system, then a corresponding number of wavelength fields are added to respectively indicate a specific wavelength value or a wavelength number meeting an agreed condition, and the definition of other fields can be the same as that of the original field.
Figure 6 shows an architectural diagram of an embodiment of the system of the present invention. In this architecture, the OLT100 may communicate with a plurality of ONUs 200, and these ONUs may use different wavelengths when sending data upstream, that is, the architecture is a GPON system with multiple wavelengths upstream.
The OLT100 is configured to obtain an uplink bandwidth requirement of at least one ONU, perform bandwidth allocation for different uplink wavelengths, and generate single-wavelength-based BWMap information corresponding to the different uplink wavelengths; generating multi-wavelength-based BWMap information according to the single-wavelength-based BWMap information corresponding to different upstream wavelengths and the wavelength information of the different upstream wavelengths; and carrying the BWMap information based on the multi-wavelength in a GTC frame, and sending the GTC frame to the ONU. The method for acquiring the uplink bandwidth requirement of the ONU comprises: acquiring an uplink dynamic bandwidth report DBRu based on different wavelengths; or idle byte statistics based on different wavelengths. The multiwavelength-based BWMap information described herein includes information indicating the number of wavelengths and/or information indicating a specific wavelength.
The ONU200 receives a GTC frame from the OLT100, where the GTC frame carries the BWMap information based on multi-wavelength; analyzing the GTC frame to obtain the BWMap information based on the multi-wavelength; and filtering the BWMap information based on the multi-wavelength to obtain BWMap information related to the upstream wavelength used by the ONU. After the filtering process, the BWMap information obtained by the filtering process may be sent to a DBA control module in the ONU, and the DBA control module performs subsequent bandwidth processing, for example: and resolving the BWMap information, and reading the specific time slot from the BWMap information so as to control the uplink data transmission.
Specifically, referring to fig. 6 and 7, the OLT100 may include a multi-wavelength BWMap information generation module 102, a plurality of single-wavelength-based DBA control modules 104, an ONU registry 101, and a GTC framing module 103.
The DBA control module 104 is configured to generate BWMap information based on a single wavelength according to an uplink bandwidth requirement of the ONU, and send the BWMap information to the multi-wavelength BWMap information generating module 102;
the multi-wavelength BWMap information generating module 102 receives the BWMap information based on single wavelength from each DBA control module 104, combines the BWMap information based on single wavelength with the uplink wavelength information corresponding to each BWMap information based on single wavelength, generates BWMap information based on multi-wavelength according to the format shown in fig. 5, and sends the BWMap information based on multi-wavelength to the GTC framing module 103.
The GTC framing module 103 multiplexes the BWMap information based on multiple wavelengths into a GTC frame according to the BWMap information based on multiple wavelengths, generates a GTC frame in a new format, and sends the GTC frame to the ONU 200. Here, the multi-wavelength BWMap information generating module may obtain the upstream wavelength corresponding to each piece of single-wavelength BWMap information by querying the ONU registry 101.
The ONU registry 101 records wavelength information of upstream wavelengths used by the ONUs and upstream wavelength information corresponding to the BWMap information for each single-wavelength.
Referring to fig. 6 and 8, the ONU200 may include a GTC frame parsing module 201, a BWMap information filtering module 202, and a DBA control module 203.
The GTC frame parsing module 201 receives the GTC frame carrying the multi-wavelength BWMap information from the OLT, parses the multi-wavelength BWMap information from the GTC frame, and forwards the multi-wavelength BWMap information to the BWMap information filtering module 202;
the BWMap information filtering module 202 is configured to perform filtering processing on the BWMap information based on multiple wavelengths, and may perform filtering according to the stored uplink wavelength used by the ONU, and forward only the BWMap information related to the uplink wavelength used by the ONU to the DBA control module 203;
the DBA control module 203 performs subsequent bandwidth processing, for example: and resolving the BWMap information, and reading the specific time slot from the BWMap information so as to control the uplink data transmission.
By implementing the embodiment of the invention, a plurality of ONUs with different uplink wavelengths can be allowed to simultaneously send uplink data in the same time period, and the uplink bandwidth of the GPON system is fully utilized, thereby not only meeting the requirement of a user on the uplink bandwidth, but also avoiding the serious waste of the uplink bandwidth caused by a dynamic bandwidth allocation mechanism of the existing GPON system when being applied to a multi-wavelength uplink GPON system.
In addition, in the GPON system with multi-wavelength uplink, with the solution in the prior art, if different ONUs use different uplink wavelengths, each time bandwidth allocation is performed, the OLT needs to send GTC frames carrying BWMap information corresponding to bandwidths allocated to the ONUs with different uplink wavelengths in a broadcast manner in the downlink direction, and accordingly, an ONU may process BWMap information of ONUs belonging to multiple different uplink wavelengths, where only a certain BWMap information is suitable for itself. By implementing the embodiment of the invention, the ONU only needs to process a group of BWmap information corresponding to the uplink wavelength used by the ONU, and the BWmap information corresponding to the uplink wavelength of other ONUs can be directly discarded, thereby reducing the information processing amount of the ONU to a certain extent, shortening the processing time, reducing unnecessary power consumption and improving the performance of the GPON system as a whole.
The foregoing is a description of specific embodiments of the invention, and the method of the invention may be modified, as appropriate, during the course of particular implementations to suit the particular needs of particular situations. It is therefore to be understood that the particular embodiments in accordance with the invention are illustrative only and are not intended to limit the scope of the invention.
Claims (14)
1. A passive optical network system is characterized by comprising an optical line terminal OLT and an optical network unit ONU; wherein,
the OLT is used for acquiring uplink bandwidth requirements of at least one ONU, respectively allocating bandwidths for different uplink wavelengths, and respectively generating bandwidth mapping (BWMap) information corresponding to the different uplink wavelengths and based on a single wavelength; generating multi-wavelength-based BWMap information according to the single-wavelength-based BWMap information corresponding to different upstream wavelengths and the wavelength information of the different upstream wavelengths; carrying the BWMap information based on the multi-wavelength in a gigabit passive optical network transmission convergence GTC frame, and sending the GTC frame to an ONU;
the ONU is used for receiving the GTC frame and analyzing the BWMap information based on the multi-wavelength; and filtering the BWMap information based on the multi-wavelength to obtain BWMap information related to the upstream wavelength used by the ONU.
2. The passive optical network system of claim 1, wherein:
the multiwavelength-based BWMap information includes information indicating the number of wavelengths and/or information indicating a specific wavelength.
3. An optical line terminal is characterized in that the optical line terminal comprises a multi-wavelength bandwidth mapping BWmap information generation module, a gigabit passive optical network transmission convergence GTC frame generation module and at least two dynamic bandwidth allocation DBA control modules;
the DBA control module is used for generating single-wavelength-based BWmap information according to the uplink bandwidth requirement of at least one optical network unit and sending the single-wavelength-based BWmap information to the multi-wavelength BWmap information generation module;
the multi-wavelength BWMap information generating module receives the BWMap information based on single wavelength from each DBA control module, combines the BWMap information based on single wavelength with the uplink wavelength information corresponding to each BWMap information based on single wavelength to generate BWMap information based on multi-wavelength, and sends the BWMap information based on multi-wavelength to the GTC frame generating module;
the GTC frame generation module is used for multiplexing the BWMap information based on multi-wavelength into a GTC frame according to the BWMap information based on multi-wavelength, and sending the GTC frame.
4. The optical line terminal of claim 3, further comprising:
and the optical network unit registry is used for providing the upstream wavelength information corresponding to each single-wavelength-based BWMap information for the multi-wavelength BWMap information generation module.
5. The optical line terminal of claim 3,
the multiwavelength-based BWMap information includes information indicating the number of wavelengths and/or information indicating a specific wavelength.
6. An optical network unit, wherein the optical network unit ONU comprises: the system comprises a gigabit passive optical network transmission convergence GTC frame analysis module and a bandwidth mapping BWmap information filtering module; wherein,
the GTC frame analyzing module is used for receiving a GTC frame from an optical line terminal, analyzing the GTC frame and analyzing BWmap information based on multiple wavelengths; sending the BWMap information based on multi-wavelength to the BWMap information filtering module;
the BWMap information filtering module is configured to filter the BWMap information based on multiple wavelengths to obtain BWMap information related to an upstream wavelength of the ONU.
7. The optical network unit of claim 6, further comprising:
and the dynamic bandwidth allocation controller is used for performing subsequent bandwidth processing by using the BWMap information obtained after the filtration of the BWMap information filtering module.
8. The optical network unit of claim 6,
the multiwavelength-based BWMap information includes information indicating the number of wavelengths and/or information indicating a specific wavelength.
9. A method for generating bandwidth mapping information, comprising:
acquiring uplink bandwidth requirements of at least one optical network unit, respectively performing bandwidth allocation aiming at different wavelengths, and respectively generating bandwidth mapping (BWmap) information corresponding to the different wavelengths and based on single wavelength;
generating multi-wavelength-based BWMap information according to the single-wavelength-based BWMap information corresponding to the different wavelengths and the wavelength information corresponding to the different wavelengths;
and carrying the BWMap information based on the multi-wavelength in a GTC frame of kilomega passive optical network transmission convergence, and sending the GTC frame.
10. The method for generating bandwidth mapping information according to claim 9,
the method for acquiring the uplink bandwidth requirement of the optical network unit includes:
acquiring an uplink dynamic bandwidth report DBRu based on different wavelengths; or
And performing idle byte counting based on different wavelengths to obtain the idle byte.
11. The method for generating bandwidth mapping information according to claim 9,
the multiwavelength-based BWMap information includes information indicating the number of wavelengths and/or information indicating a specific wavelength.
12. The method for generating bandwidth mapping information according to claim 9, further comprising:
and acquiring wavelength information corresponding to the different wavelengths by inquiring an optical network unit registry.
13. A method for processing bandwidth mapping information, comprising:
receiving a gigabit passive optical network transmission convergence (GTC) frame from an optical line terminal, wherein the GTC frame carries multi-wavelength-based BWmap information;
analyzing the GTC frame to obtain the BWMap information based on the multi-wavelength;
and filtering the BWMap information based on the multi-wavelength to obtain BWMap information related to the upstream wavelength used by the ONU.
14. The method for processing bandwidth mapping information according to claim 13, further comprising,
the multiwavelength-based BWMap information includes information indicating the number of wavelengths and/or information indicating a specific wavelength.
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| CN101035389A (en) * | 2006-03-08 | 2007-09-12 | 上海交通大学 | System and method for bandwidth allocation in the remote device of the passive optical network |
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| CN101047464B (en) * | 2006-06-05 | 2010-12-08 | 华为技术有限公司 | Controlled multicast method and system for wave complex optical network |
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