CN101621454B - Passive optical network system, optical line terminal and optical network units - Google Patents
Passive optical network system, optical line terminal and optical network units Download PDFInfo
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- CN101621454B CN101621454B CN 200810068241 CN200810068241A CN101621454B CN 101621454 B CN101621454 B CN 101621454B CN 200810068241 CN200810068241 CN 200810068241 CN 200810068241 A CN200810068241 A CN 200810068241A CN 101621454 B CN101621454 B CN 101621454B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
- H04B10/272—Star-type networks or tree-type networks
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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
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
- H04J14/0247—Sharing one wavelength for at least a group of ONUs
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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
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
- H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
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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
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
- H04J14/0252—Sharing one wavelength for at least a group of ONUs, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
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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
- H04J14/0267—Optical signaling or routing
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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
- H04J14/0267—Optical signaling or routing
- H04J14/0269—Optical signaling or routing using tables for routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0282—WDM tree architectures
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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
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Abstract
The invention discloses a passive optical network system, an optical line terminal, optical network units and a method for realizing load balance. The system comprises the optical line terminal OLT and the optical network units ONU, wherein the OLT is used for monitoring the uplink flow rate of at least one ONU, counting the uplink flow rates of uplink wavelengths according to the monitored uplink flow rates of the ONUs, judging whether uplink flow rate unbalance occurs among the uplink wavelengths according to preset conditions, determining the ONUs needing wavelength adjustment if the uplink flow rate unbalance occurs, generating wavelength adjustment messages and transmitting the messages to the ONUs needing wavelength adjustment; and the ONUs receive the wavelength adjustment messages from the OLT and perform corresponding wavelength adjustment according to the wavelength adjustment messages.
Description
Technical field
The present invention relates to communication technical field, the method that relates in particular to a kind of passive optical network, optical line terminal and optical network unit and realize load balancing.
Background technology
Along with telecommunication service becomes increasingly abundant, the user is also increasing to the demand of access bandwidth; In various access technologies have huge bandwidth and to be suitable for long Distance Transmission because optical fiber inserts, countries in the world operator one after another will Fiber to the home (FTTH, fiberto the home) as the inevitable choice of Access Network.In the concrete realization of FTTH, EPON (PON, passive optical network) technology is the more technology that adopts at present.
Accompanying drawing 1 is a kind of networking diagram of PON network.PON has adopted the framework of putting multiple spot, and wherein optical line terminal (OLT, opticalline terminal) transmits to the signal on optical network unit (ONU, the optical network unit) direction, is called descending; And the transmission of the signal from ONU to the OLT direction is called up; Be broadcast mode on the down direction, and be mode of unicast on the up direction.
PON can be divided into many types again, wherein Gigabit Passive Optical Network (GPON according to the difference of concrete technology; Gigabit Passive Optical Network); Owing to have higher bandwidth efficiency, its synchronization timing mechanism is continued to use traditional SDH (SDH, Synchronous Digital Hierarchy); Business that can adaptive different rates, thereby become the connecting system that various countries telecom operators relatively make earnest efforts at present.
Along with the continuous expansion of userbase and the user increase day by day to bandwidth demand, the GPON system of existing descending 2.5Gbps, up 1.25G bps has been difficult to meet the demands, and therefore needs to improve upstream and downstream bandwidth.
The descending employing 10G bps of FSAN network (FSAN, Full Service Access Network) white paper suggestion sends, and considers the burst transmission that 5G bps is above and happens suddenly to receive and realize that difficulty is bigger; The equipment cost is higher; Less stable, and the burst of 2.5G bps is sent and the burst reception is easier to realize, can partly reuse existing ripe device simultaneously; Therefore the up 2.5G bps. that can adopt is in order to increase upstream bandwidth; Can increase the up wavelength number of use, each wavelength carries the upstream rate of 2.5G bps, promptly improves the upstream bandwidth of each ONU through the ONU number that reduces single wavelength carrying.
Accompanying drawing 2 is the descending 10G bps that describes in the FSAN NGA1 white paper, the framework of up N * 2.5G bps; If require up-downgoing symmetry, so uply can adopt 4 * 2.5G.
The unbalanced problem of load in above-mentioned up multi-wavelength system, may occur, promptly the uplink traffic of certain wavelength is loaded very greatly even above handling, and other wavelength possibly be in the free time.Can bring great bandwidth waste like this.
In addition, in existing high branching ratio (as 1: 512,1: 1024) PON system, in order to solve the problem of resource-constraineds such as ONU-ID and GEM-ID; Simultaneously think not revise as far as possible existing protocol again; Reuse existing partial design and realization, can adopt the method for grouping, promptly do not expand the length of ONU-ID and GEM port-ID; Only ONU is divided into groups; When ONU registers, divide into groups for it, the ONU-ID of ONU, Alloc-ID in same group, GEM port-ID must be unique, and these signs can be identical between the different grouping.Receive the restriction of existing protocol, every group ONU number can not be above 254; If branching ratio further enlarges in the future, only need to increase packet count and get final product.Do not have positive connection between ONU grouping described here and the up wavelength, the ONU that promptly belongs to a grouping can use different up wavelength respectively; Simultaneously, consider that branching ratio might further expand as 1024 even 2048 in the future, constant in order to keep existing TC layer protocol frame, use the ONU of same up wavelength to lay respectively in the different packets.
But so also can bring the unbalanced problem of load, i.e. the flow of certain grouping is very big even surpass apparatus of load, and other groupings then are in idle condition, have so just brought the significant wastage of bandwidth resources.
Summary of the invention
The method that the object of the present invention is to provide a kind of passive optical network, optical line terminal and optical network unit and realize load balancing, thus realize between the up wavelength different in the up multi-wavelength system or the load balance of different ONU between dividing into groups.
Embodiments of the invention provide a kind of passive optical network, comprise optical line terminal OLT and optical network unit ONU; Wherein,
Said OLT is used to monitor the uplink traffic of at least one ONU, and the uplink traffic of each ONU that obtains according to monitoring counts the uplink traffic of each up wavelength; According to predetermined condition, judge whether occurred the unbalanced situation of uplink traffic between the up wavelength; When the unbalanced situation of uplink traffic having occurred, confirm to carry out the ONU of wavelength adjustment, generate wavelength adjustment message, and send to the ONU that said needs carry out the wavelength adjustment;
Said ONU is used to receive the wavelength adjustment message that comes from said OLT, according to said wavelength adjustment message, carries out corresponding wavelength adjustment.
Embodiments of the invention also provide a kind of passive optical network, comprise optical line terminal OLT and optical network unit ONU; Wherein,
Said OLT is used to monitor the downlink traffic of at least one ONU, and the downlink traffic of said each ONU that obtains according to monitoring counts the downlink traffic that each ONU divides into groups; According to predetermined condition, judge whether ONU the unbalanced situation of downlink traffic occurred between dividing into groups; When the unbalanced situation of downlink traffic having occurred, definite ONU that need divide into groups to adjust generates the adjustment message of dividing into groups, and sends to the ONU that said needs divide into groups to adjust;
Said ONU is used to receive the grouping adjustment message that comes from said OLT, according to said grouping adjustment message, the adjustment of dividing into groups accordingly.
The embodiment of the invention also provides a kind of optical line terminal, and described optical line terminal comprises traffic monitoring module and load balancing adjusting module; Wherein,
Said traffic monitoring module is used to monitor the uplink traffic of at least one optical network unit ONU, and the uplink traffic of each ONU that obtains according to monitoring counts the uplink traffic of each up wavelength; According to predetermined conditions, judge the situation that whether has occurred the mass flow discrepancy weighing apparatus between the up wavelength; When the situation of mass flow discrepancy weighing apparatus having occurred, indicate said load balancing adjusting module to carry out handled;
Described load balancing adjusting module, receive the indication of said traffic monitoring module after, the ONU that confirms to carry out the wavelength adjustment generates wavelength adjustment message, sends said wavelength adjustment message.
The embodiment of the invention also provides a kind of optical line terminal, and described optical line terminal comprises traffic monitoring module and load balancing adjusting module; Wherein,
Said traffic monitoring module is used to monitor the downlink traffic of at least one optical network unit ONU, and the downlink traffic of each ONU that obtains according to monitoring counts the downlink traffic that each ONU divides into groups; According to predetermined conditions, judge whether ONU the situation that mass flow discrepancy weighs occurred between dividing into groups; When the situation of mass flow discrepancy weighing apparatus having occurred, indicate said load balancing adjusting module to carry out handled;
Described load balancing adjusting module, receive the indication of said traffic monitoring module after, confirm the ONU that need divide into groups to adjust to generate the adjustment message of dividing into groups, send said grouping adjustment message.
The embodiment of the invention also provides a kind of optical network unit, and described optical network unit comprises Gigabit Passive Optical Network Transmission Convergence GTC frame processing module and load balancing adjusting module;
Described GTC frame processing module is used to receive the GTC frame that comes from optical line terminal, therefrom parses load balancing adjustment message, gives the load balancing adjusting module with said load balancing adjustment forwards;
Described load balancing adjusting module is used for newly assigned wavelength or packet number, replacing original wavelength or packet number of preserving according to the said load balancing adjustment message that receives, and carries out the load balancing adjustment.
The embodiment of the invention also provides a kind of method that realizes load balancing, draws together:
Monitor the uplink traffic of at least one optical network unit ONU, calculate the corresponding uplink traffic of each up wavelength;
When the unbalanced situation of uplink traffic occurring between the said up wavelength, confirm to carry out the ONU of wavelength adjustment, generate corresponding wavelength adjustment message;
Described wavelength adjustment message is sent to the ONU that said needs carry out the wavelength adjustment, and the ONU that indicates said needs to carry out the wavelength adjustment revises employed up wavelength when sending data.
The embodiment of the invention also provides a kind of method that realizes load balancing, comprising:
Monitor the downlink traffic of at least one optical network unit ONU; Utilize the downlink traffic of monitoring each ONU that obtains, count the downlink traffic that ONU divides into groups;
When the situation of mass flow discrepancy weighing apparatus between described ONU divides into groups, occurring, definite ONU that need divide into groups to adjust generates the corresponding adjustment message of dividing into groups;
Described grouping adjustment message is sent to the ONU that said needs divide into groups to adjust, and the ONU that indicates said needs to divide into groups to adjust divides into groups to adjust.
Beneficial effect of the present invention:
Through the embodiment of embodiment of the present invention, solved the unbalanced problem of load that may occur between the up wavelength different in the up multi-wavelength PON system effectively; And, in the PON system that exists ONU to divide into groups, the unbalanced problem of load that different ONU may occur between dividing into groups, the bandwidth resources of system are fully used; Utilize embodiments of the invention, can reuse existing part design of protocol and realization; Dynamically up wavelength of adjustment or packet number strengthen the networking configuration flexibility, and can realize load balancing effectively.
Description of drawings
Fig. 1 is a kind of networking diagram of PON network;
The framework of Fig. 2 for describing in the FSAN NGA1 white paper;
Fig. 3 is the flow chart of the inventive method embodiment;
Fig. 4 is the flow chart of the inventive method embodiment;
Fig. 5 is the system architecture diagram of the embodiment of the invention;
The structure chart of the optical line terminal that Fig. 6 provides for the embodiment of the invention;
The structure chart of the optical network unit that Fig. 7 provides for the embodiment of the invention;
The cut-away view of the optical network unit that Fig. 8 provides for the embodiment of the invention;
The cut-away view of the optical network unit that Fig. 9 provides for the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated.
Accompanying drawing 3 shows the flow process of a method embodiment of the present invention, and this embodiment is primarily aimed in the up GPON system of multi-wavelength, occurs the unbalanced situation of uplink traffic between the different up wavelength, comprises that step is following:
Step 301, optical line terminal (OLT) are monitored the uplink traffic of at least one optical network unit (ONU) in real time; The uplink traffic of each ONU that obtains according to monitoring; Count the pairing uplink traffic of each up wavelength in the system; And, judge whether occurred the unbalanced situation of uplink traffic between the different up wavelength according to predetermined conditions; Said predetermined conditions for example may be prescribed as: the difference between the uplink traffic of different up wavelength can not surpass a pre-set threshold; Also may be prescribed as: the uplink traffic of each up wavelength can not surpass a pre-set threshold, and perhaps the uplink traffic of each up wavelength can not be lower than a pre-set threshold; Can also stipulate a upper limit threshold and lower threshold simultaneously for the uplink traffic of each up wavelength, promptly the uplink traffic of each up wavelength should be lower than upper limit threshold, and is higher than lower threshold, otherwise just thinks to have occurred the unbalanced situation of uplink traffic.Described threshold value both can be a predefined fixed value; Also can be the numerical value that in system's running, can dynamically adjust.
Step 302, after OLT judges between the up wavelength of difference, the unbalanced situation of uplink traffic occurred, can be according to certain wavelength adjustment strategy, the ONU that confirms to carry out the wavelength adjustment generates corresponding wavelength adjustment message then; The ONU that carries out the wavelength adjustment to said needs sends said wavelength adjustment message, indicates described ONU to revise employed up wavelength when sending data;
In this step; When confirming to carry out the ONU of wavelength adjustment; Concrete wavelength adjustment strategy can be: a plurality of ONU that use same up wavelength are carried out the flow ordering, select flow to be higher than certain threshold value or be lower than the ONU of certain threshold value, the up wavelength of its use is adjusted into other wavelength; The priority that also can combine different ONU is selected the up wavelength of certain ONU is adjusted into other wavelength.The form that wavelength adjustment message described here can adopt is PLOAM (Physical Layer OAM) message or OMCI (ONU Management and Control Interface) message.Concrete can adopt following several kinds of modes:
1) use the reserved field of Assign_ONU-ID PLOAM message to carry described wavelength adjustment strategy, concrete form is following:
| Byte number | Content | Describe |
| 1 | 11111111 | Broadcast to all ONU |
| 2 | 00000011 | Message identifier |
| 3 | pppppppp | ?ONU-ID |
| 4 | abcdefgh | The 1st byte of sequence number |
| 5-10 | ..... | ? |
| 11 | stuvwxyz | The 8th byte of sequence number |
| 12 | Do not stipulate | Reserve |
2) use the reserved field of Ranging_Time PLOAM message to carry described wavelength adjustment strategy, concrete form is following:
| Byte number | Content | Describe |
| 1 | ONU-ID | To |
| 2 | 00000100 | Message identifier |
| 3 | 0000000b | ' 0 ': the balanced time delay ' 1 ' of service aisle: protection channel-equalization time delay |
| 4 | dddddddd | The MSB of time delay |
| 5 | dddddddd | ? |
| 6 | dddddddd | ? |
| 7 | dddddddd | The LSB of time delay |
| 8-12 | Do not stipulate | Reserve |
3) newly-increased a kind of PLOAM message is used for carrying described wavelength adjustment strategy;
4) newly-increased a kind of OMCI message is used for carrying described wavelength adjustment strategy.
After step 303, described ONU receive said wavelength adjustment message, according to said wavelength adjustment message, revise employed up wavelength when sending data, the up wavelength that is about to current use is adjusted into new up wavelength, to carry the upstream data that sends; Note the laser that is wavelength-tunable that said ONU uses here.In addition, when carrying out the wavelength adjustment, because the still original optical fiber that relevant ONU uses, ONU does not change to the distance between the OLT, therefore, does not need to find range again; And; Owing to when the PON system carries user service data, use GEM port-ID to identify different service streams, when carrying out load balancing; The wavelength that uses during up transmission of just ONU that change, and the GEM port-ID that identifies each Business Stream can not change.
Step 304, described ONU send the adjustment response message to said OLT after accomplishing the wavelength adjustment;
Step 305, described OLT refresh the relevant entries in the ONU registration table after receiving the adjustment response message that comes from said ONU, particularly the list item of the up wavelength of relevant ONU.According to the mode of stipulating in the standard,, transmit to the network side business interface according to GEM port-ID when described OLT receives the Business Stream that comes from said ONU; Because when carrying out the load balancing adjustment; Service outage duration depends primarily on the time that OLT refreshes the ONU registration table; And that OLT refreshes the time of ONU registration table is very short; Be generally several microseconds, almost can ignore, need not therefore to consider that the service disconnection or the packet loss that bring because of load balancing influence.
In addition, in existing high branching ratio (as 1: 512,1: 1024) PON system, in order to solve the problem of resource-constraineds such as ONU-ID and GEM-ID; Simultaneously think not revise as far as possible existing protocol again; Reuse existing partial design and realization, can adopt the method for grouping, promptly do not expand the length of ONU-ID and GEM port-ID; Only ONU is divided into groups; When ONU registers, divide into groups for it, the ONU-ID of ONU, Alloc-ID in same group, GEM port-ID must be unique, and these signs can be identical between the different grouping.Correspondingly, accompanying drawing 4 shows the flow chart of another method of the present invention embodiment, and present embodiment is primarily aimed in the PON system, and when existing ONU to divide into groups, the unbalanced situation of uplink traffic that different ONU possibly occur between dividing into groups comprises that step is following:
Step 401, OLT monitor the downlink traffic of at least one ONU in real time; And according to the downlink traffic of monitor each ONU that obtains; Count the downlink traffic that ONU divides into groups,, judge whether different ONU the unbalanced situation of downlink traffic occurred between dividing into groups according to predetermined conditions; Said predetermined conditions for example may be prescribed as: the difference between the downlink traffic that different ONU divide into groups can not surpass a pre-set threshold; Also may be prescribed as: the downlink traffic that each ONU divides into groups can not surpass a pre-set threshold, or the downlink traffic that each ONU divides into groups can not be lower than a pre-set threshold; Can also stipulate a upper limit threshold and lower threshold simultaneously for the downlink traffic that each ONU divides into groups, promptly the downlink traffic of each ONU grouping should be lower than upper limit threshold, and is higher than lower threshold, otherwise just thinks to have occurred the unbalanced situation of downlink traffic.Described threshold value both can be a predefined fixed value; Also can be the numerical value that in system's running, can dynamically adjust.
Step 402, when said OLT judges the situation that the mass flow discrepancy weighing apparatus occurred; Can be according to certain grouping adjustment strategy; The ONU that definite needs divide into groups to adjust; Generate the adjustment message of dividing into groups then, described grouping adjustment message is sent to the ONU that said needs divide into groups to adjust, indicate described ONU to divide into groups to adjust;
In this step; When confirming the ONU that need divide into groups to adjust; Described grouping adjustment strategy specifically can be: for the ONU of same ONU in dividing into groups sorts by descending flow, select flow to be lower than certain threshold value or be higher than the ONU of certain threshold value, the ONU that divides into groups to adjust as needs.The form that the grouping adjustment message here can adopt is PLOAM message or OMCI message.Concrete can adopt following several kinds of modes:
1) use the reserved field of Assign_ONU-ID PLOAM message to carry described grouping adjustment strategy, concrete form is following:
| Byte number | Content | Describe |
| 1 | 11111111 | Broadcast to all |
| 2 | 00000011 | Message identifier |
| 3 | pppppppp | ?ONU-ID |
| 4 | abcdefgh | The 1st byte of sequence number |
| 5-10 | ..... | ? |
| 11 | stuvwxyz | The 8th byte of sequence number |
| 12 | Do not stipulate | Reserve |
2) use the reserved field of Ranging_Time PLOAM message to carry described grouping adjustment strategy, concrete form is following:
| Byte number | Content | Describe |
| 1 | ONU-ID | To |
| 2 | 00000100 | Message identifier |
| 3 | 0000000b | ' 0 ': the balanced time delay ' 1 ' of service aisle: protection channel-equalization time delay |
| 4 | dddddddd | The MSB of time delay |
| 5 | dddddddd | ? |
| 6 | dddddddd | ? |
| 7 | dddddddd | The LSB of time delay |
| 8-12 | Do not stipulate | Reserve |
[0068]3) newly-increased a kind of PLOAM message is used for carrying described grouping adjustment strategy;
4) newly-increased a kind of OMCI message is used for carrying described grouping adjustment strategy.
Step 403, after ONU that said needs divide into groups to adjust receives said grouping adjustment message, according to said grouping adjustment message, adjust the grouping under the said ONU.ONU after adjustment is divided into groups at down direction, receives only the GTC frame that belongs to new grouping; Send GTC frame at up direction based on new grouping.Thereby can, different ONU realize load balancing between dividing into groups.
In the present embodiment; When the PON system carries user service data, use GEM port-ID to identify different service streams, when between different ONU divides into groups, carrying out load balancing; Grouping under the just ONU that changes, the GEM port-ID that identifies each Business Stream can't change.
After step 404, described ONU accomplish the adjustment of dividing into groups, generate the adjustment response message, send said adjustment response message to said OLT;
Step 405, described OLT refresh the relevant entries in the ONU registration table after receiving the adjustment response message that comes from said ONU, particularly the list item of the packet number of relevant ONU.According to the mode of stipulating in the standard, described OLT receives the Business Stream that comes from said ONU, transmits to the network side business interface according to GEM port-ID and affiliated ONU packet number; Because when carrying out the load balancing adjustment; Service outage duration depends primarily on the time that OLT refreshes the ONU registration table; And that OLT refreshes the time of ONU registration table is very short; Be generally several microseconds, almost can ignore, need not therefore to consider that the service disconnection or the packet loss that bring because of load balancing influence.
Accompanying drawing 5 shows the Organization Chart of system embodiment of the present invention.As shown in the figure, comprise OLT200 in this framework, said OLT200 and a plurality of optical network unit ONU 100 communicate;
In the up PON system of multi-wavelength, to the unbalanced situation of uplink traffic that occurs between the up wavelength of difference, system embodiment provided by the invention can for:
Said OLT200 is used to monitor the uplink traffic of at least one ONU100, and the uplink traffic of said each ONU that obtains according to monitoring counts the uplink traffic of each up wavelength; According to predetermined condition, judge whether occurred the unbalanced situation of uplink traffic between the up wavelength; When the unbalanced situation of uplink traffic having occurred, confirm to carry out the ONU of wavelength adjustment, generate wavelength adjustment message, and send to the ONU that said needs carry out the wavelength adjustment;
Said ONU100 is used to receive the wavelength adjustment message that comes from said OLT200, according to said wavelength adjustment message, carries out corresponding wavelength adjustment.
In the present embodiment, the concrete structure about OLT and ONU please refer to following description:
OLT200 in accompanying drawing 5 and the accompanying drawing 6 can comprise that GTC becomes frame module 201, traffic monitoring module 202 and load balancing adjusting module 203.
Described traffic monitoring module 202 is used for monitoring in real time the uplink traffic of at least one ONU, and the uplink traffic of said each ONU that obtains according to monitoring counts the uplink traffic of each up wavelength; According to predetermined conditions, judge the situation that whether has occurred the mass flow discrepancy weighing apparatus between the up wavelength; When the situation of mass flow discrepancy weighing apparatus having occurred, indication load balancing adjusting module 203 carries out handled; Can be about said predetermined conditions referring to the description of front method embodiment.
Described load balancing adjusting module 203, receive the indication of traffic monitoring module 202 after, can be according to certain wavelength adjustment strategy, the ONU that confirms to carry out the wavelength adjustment generates wavelength adjustment message then, sends to GTC and becomes frame module 201.Load balancing adjusting module described here can be the module that increases newly, also can be the expansion of original OMCI or PLOAM module.Wavelength adjustment strategy described here can be referring to the description of previous methods embodiment; The form that described wavelength adjustment message can adopt is PLOAM message or OMCI message.Several kinds of modes that specifically can adopt can repeat no more with reference to the description of top method embodiment here.
Described GTC becomes frame module 201, receive the wavelength adjustment message that comes from said load balancing adjusting module 203 after, said wavelength adjustment message is carried in the GTC frame, send to the ONU that need carry out the wavelength adjustment.
See also accompanying drawing 5 and accompanying drawing 7, ONU100 wherein can comprise GTC frame processing module 101 and load balancing adjusting module 102.
Described GTC frame processing module 101 can be used to receive the GTC frame that comes from OLT200, therefrom parses wavelength adjustment message, gives load balancing adjusting module 102 with said wavelength adjustment forwards;
Described load balancing adjusting module 102 can be used for using newly assigned wavelength according to the said wavelength adjustment message that receives, and replaces the original wavelength of preserving, and carries out the load balancing adjustment; Described load balancing adjustment is specially: ONU adopts newly assigned wavelength to send upstream data, thereby the uplink traffic of different up wavelength has obtained adjustment, can realize the equilibrium of the uplink traffic between the different up wavelength.
In addition, described load balancing adjusting module 102 can also be used for generating the adjustment response message, is transmitted to said GTC frame processing module 101, is carried in the GTC frame and sends to OLT.
In the PON system that exists ONU to divide into groups, the situation of the mass flow discrepancy weighing apparatus that occurs between dividing into groups to different ONU, system embodiment provided by the invention can for:
Said OLT is used to monitor the downlink traffic of at least one ONU, and the downlink traffic of said each ONU that obtains according to monitoring counts the downlink traffic that each ONU divides into groups; According to predetermined condition, judge whether ONU the unbalanced situation of downlink traffic occurred between dividing into groups; When the unbalanced situation of downlink traffic having occurred, definite ONU that need divide into groups to adjust generates the adjustment message of dividing into groups, and sends to the ONU that said needs divide into groups to adjust;
Said ONU is used to receive the grouping adjustment message that comes from said OLT, according to said grouping adjustment message, the adjustment of dividing into groups accordingly.
In the present embodiment, the concrete structure about OLT and ONU please refer to following description:
OLT200 in accompanying drawing 5 and the accompanying drawing 6 can comprise that GTC becomes frame module 201, traffic monitoring module 202 and load balancing adjusting module 203.
Described traffic monitoring module 202 can be used to monitor the downlink traffic of at least one optical network unit ONU, and the downlink traffic of said each ONU that obtains according to monitoring counts the downlink traffic that each ONU divides into groups; According to predetermined conditions, judge whether ONU the situation that mass flow discrepancy weighs occurred between dividing into groups; When the situation of mass flow discrepancy weighing apparatus having occurred, indicate said load balancing adjusting module to carry out handled; Can be about said predetermined conditions referring to the description of front method embodiment.
Described load balancing adjusting module 203; Can be used for after the indication that receives traffic monitoring module 202, can confirm the ONU that need divide into groups to adjust according to certain grouping adjustment strategy; Generate the adjustment message of dividing into groups then, send to GTC and become frame module 201.Load balancing adjusting module described here can be the module that increases newly, also can be the expansion of original OMCI or PLOAM module.Grouping adjustment strategy described here can be referring to the description of previous methods embodiment; The form that described grouping adjustment message can adopt is PLOAM message or OMCI message.Several kinds of modes that specifically can adopt can repeat no more with reference to the description of top method embodiment here.
Described GTC becomes frame module 201, receive the grouping adjustment message that comes from said load balancing adjusting module 203 after, said grouping adjustment message is carried in the GTC frame, send to the ONU that need divide into groups to adjust.
See also accompanying drawing 5 and accompanying drawing 7, ONU100 wherein can comprise GTC frame processing module 101 and load balancing adjusting module 102.
Described GTC frame processing module 101 is used to receive the GTC frame that comes from OLT200, therefrom parses the adjustment message of dividing into groups, and gives load balancing adjusting module 102 with said grouping adjustment forwards;
Described load balancing adjusting module 102 is used for using newly assigned packet number according to the said grouping adjustment message that receives, and replaces original packet number of preserving, and carries out the load balancing adjustment; Described load balancing adjustment is specially: according to said grouping adjustment message, adjust the affiliated grouping of said ONU.ONU after adjustment is divided into groups at down direction, receives only the GTC frame that belongs to new grouping; Send GTC frame at up direction, thereby can between different ONU divides into groups, realize load balancing based on new grouping.
In addition, described load balancing adjusting module 102 can also be used for generating the adjustment response message, is transmitted to said GTC frame processing module 101, is carried in the GTC frame and sends to OLT.
Accompanying drawing 8 shows the cut-away view that carries out the ONU of load balancing with the mode of the adjustment of dividing into groups; Wherein, Load balancing adjusting module 102 sends to GTC frame processing module 101 with adjusted packet number, and GTC transmitter 103 adopts new packet number to send the GTC frame to OLT.
Accompanying drawing 9 shows the cut-away view that carries out the ONU of load balancing with the mode of wavelength adjustment, and wherein, load balancing adjusting module 102 is preserved adjusted up wavelength, and transmitter 103 uses adjusted upgoing wave long hair to serve line data.
Through the embodiment of embodiment of the present invention, solved the unbalanced problem of load that may occur between the up wavelength different in the up multi-wavelength PON system effectively; And, in the PON system that exists ONU to divide into groups, the unbalanced problem of load that different ONU may occur between dividing into groups.The bandwidth resources of system are fully used.Utilize embodiments of the invention, can reuse existing part design of protocol and realization; Dynamically up wavelength of adjustment or packet number strengthen the networking configuration flexibility, thereby have realized between the different up wavelength effectively or the equally loaded of different ONU between dividing into groups.
More than be explanation, in concrete implementation process, can carry out suitable improvement, to adapt to the concrete needs of concrete condition method of the present invention to the specific embodiment of the invention.Therefore be appreciated that embodiment according to the present invention just plays an exemplary role, not in order to restriction protection scope of the present invention.
Claims (10)
1. a passive optical network is characterized in that, comprises optical line terminal OLT and optical network unit ONU; Wherein,
Said OLT is used to monitor the uplink traffic of at least one ONU, and the uplink traffic of each ONU that obtains according to monitoring counts the uplink traffic of each up wavelength; According to predetermined condition, judge whether occurred the unbalanced situation of uplink traffic between the up wavelength; When the unbalanced situation of uplink traffic having occurred, confirm to carry out the ONU of wavelength adjustment, generate wavelength adjustment message, and send to the ONU that said needs carry out the wavelength adjustment;
Said ONU is used to receive the wavelength adjustment message that comes from said OLT, according to said wavelength adjustment message, carries out corresponding wavelength adjustment.
2. a passive optical network is characterized in that, comprises optical line terminal OLT and optical network unit ONU; Wherein,
Said OLT is used to monitor the downlink traffic of at least one ONU, and the downlink traffic of each ONU that obtains according to monitoring counts the downlink traffic that each ONU divides into groups; According to predetermined condition, judge whether ONU the unbalanced situation of downlink traffic occurred between dividing into groups; When the unbalanced situation of downlink traffic having occurred, definite ONU that need divide into groups to adjust generates the adjustment message of dividing into groups, and sends to the ONU that said needs divide into groups to adjust;
Said ONU is used to receive the grouping adjustment message that comes from said OLT, according to said grouping adjustment message, the adjustment of dividing into groups accordingly.
3. an optical line terminal is characterized in that, described optical line terminal comprises traffic monitoring module and load balancing adjusting module; Wherein,
Said traffic monitoring module is used to monitor the uplink traffic of at least one optical network unit ONU, and the uplink traffic of each ONU that obtains according to monitoring counts the uplink traffic of each up wavelength; According to predetermined conditions, judge the situation that whether has occurred the mass flow discrepancy weighing apparatus between the up wavelength; When the situation of mass flow discrepancy weighing apparatus having occurred, indicate said load balancing adjusting module to carry out handled;
Described load balancing adjusting module, receive the indication of said traffic monitoring module after, the ONU that confirms to carry out the wavelength adjustment generates wavelength adjustment message, sends said wavelength adjustment message.
4. optical line terminal according to claim 3 is characterized in that, also comprises:
Gigabit Passive Optical Network Transmission Convergence GTC becomes frame module, is used to receive the wavelength adjustment message that comes from said load balancing adjusting module, said wavelength adjustment message is carried in the GTC frame send.
5. an optical line terminal is characterized in that, described optical line terminal comprises traffic monitoring module and load balancing adjusting module; Wherein,
Said traffic monitoring module is used to monitor the downlink traffic of at least one optical network unit ONU, and the downlink traffic of each ONU that obtains according to monitoring counts the downlink traffic that each ONU divides into groups; According to predetermined conditions, judge whether ONU the situation that mass flow discrepancy weighs occurred between dividing into groups; When the situation of mass flow discrepancy weighing apparatus having occurred, indicate said load balancing adjusting module to carry out handled;
Described load balancing adjusting module, receive the indication of said traffic monitoring module after, confirm the ONU that need divide into groups to adjust to generate the adjustment message of dividing into groups, send said grouping adjustment message.
6. optical line terminal according to claim 5 is characterized in that, also comprises:
Gigabit Passive Optical Network Transmission Convergence GTC becomes frame module, is used to receive the grouping adjustment message that comes from said load balancing adjusting module, said grouping adjustment message is carried in the GTC frame send.
7. an optical network unit is characterized in that, described optical network unit comprises Gigabit Passive Optical Network Transmission Convergence GTC frame processing module and load balancing adjusting module;
Described GTC frame processing module is used to receive the GTC frame that comes from optical line terminal, therefrom parses load balancing adjustment message, gives the load balancing adjusting module with said load balancing adjustment forwards;
Described load balancing adjusting module is used for newly assigned wavelength or packet number, replacing original wavelength or packet number of preserving according to the said load balancing adjustment message that receives, and carries out the load balancing adjustment.
8. optical network unit according to claim 7 is characterized in that,
Described load balancing adjustment message comprises wavelength adjustment message or the adjustment message of dividing into groups.
9. a method that realizes load balancing is characterized in that, comprising:
Monitor the uplink traffic of at least one optical network unit ONU, calculate the corresponding uplink traffic of each up wavelength;
When the unbalanced situation of uplink traffic occurring between the said up wavelength, confirm to carry out the ONU of wavelength adjustment, generate corresponding wavelength adjustment message;
Described wavelength adjustment message is sent to the ONU that said needs carry out the wavelength adjustment, and the ONU that indicates said needs to carry out the wavelength adjustment revises employed up wavelength when sending data.
10. a method that realizes load balancing is characterized in that, comprising:
Monitor the downlink traffic of at least one optical network unit ONU; Utilize the downlink traffic of monitoring each ONU that obtains, count the downlink traffic that ONU divides into groups;
When the situation of mass flow discrepancy weighing apparatus between described ONU divides into groups, occurring, definite ONU that need divide into groups to adjust generates the corresponding adjustment message of dividing into groups;
Described grouping adjustment message is sent to the ONU that said needs divide into groups to adjust, and the ONU that indicates said needs to divide into groups to adjust divides into groups to adjust.
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| CN 200810068241 CN101621454B (en) | 2008-06-30 | 2008-06-30 | Passive optical network system, optical line terminal and optical network units |
| PCT/CN2009/071435 WO2010000153A1 (en) | 2008-06-30 | 2009-04-24 | A passive optical network system, optical line terminal, optical network unit and a method for realizing load equalization |
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| CN102170373A (en) * | 2010-02-25 | 2011-08-31 | 国信朗讯科技网络技术有限公司 | Method and device for monitoring network flow |
| CN102388566B (en) * | 2011-09-26 | 2014-03-05 | 华为技术有限公司 | Method, device and system for converting identifier of terminal device |
| US20130121684A1 (en) * | 2011-11-10 | 2013-05-16 | Alcatel-Lucent Usa Inc. | Apparatus And Method For Providing Protection In A Passive Optical Network |
| CN102511170B (en) * | 2011-11-15 | 2015-04-08 | 华为技术有限公司 | Channel balance method and device for passive optical network |
| CN103379100B (en) * | 2012-04-20 | 2019-02-12 | 中兴通讯股份有限公司 | The same axle unit of data transmission method and light of Opto-electronic system |
| CN103841474B (en) * | 2012-11-23 | 2019-01-25 | 中兴通讯股份有限公司 | Wavelength tuning method, system and equipment in a kind of passive optical network |
| CN107294637B (en) | 2013-02-06 | 2019-06-04 | 上海诺基亚贝尔股份有限公司 | A method of for automatically configuring the wavelength of optical network unit |
| CN105763963A (en) * | 2014-12-18 | 2016-07-13 | 中兴通讯股份有限公司 | Service transmission method and device |
| CN105792027B (en) * | 2014-12-22 | 2019-11-29 | 南京中兴新软件有限责任公司 | Passive optical network, controller and the method for communication |
| CN105391644B (en) * | 2015-12-01 | 2019-06-07 | 上海斐讯数据通信技术有限公司 | SiteServer LBS and method based on optical-fiber network |
| CN106911578B (en) * | 2015-12-23 | 2020-09-08 | 中国移动通信集团公司 | Service data transmission method and device |
| CN107484043B (en) * | 2017-07-11 | 2020-02-07 | 北京邮电大学 | Power optical fiber access network and control method thereof |
| CN107634815B (en) * | 2017-08-30 | 2019-05-07 | 北京国电通网络技术有限公司 | A kind of Wavelength allocation method and system |
| CN111385053B (en) | 2018-12-29 | 2022-11-08 | 中兴通讯股份有限公司 | Data transmitting and receiving, wavelength configuration method and device, wireless access system and storage medium |
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