CN101621454A - 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 PDF

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Publication number
CN101621454A
CN101621454A CN 200810068241 CN200810068241A CN101621454A CN 101621454 A CN101621454 A CN 101621454A CN 200810068241 CN200810068241 CN 200810068241 CN 200810068241 A CN200810068241 A CN 200810068241A CN 101621454 A CN101621454 A CN 101621454A
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China
Prior art keywords
onu
wavelength
message
grouping
load balancing
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CN 200810068241
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CN101621454B (en
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高波
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN 200810068241 priority Critical patent/CN101621454B/en
Priority to PCT/CN2009/071435 priority patent/WO2010000153A1/en
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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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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

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

Passive optical network, optical line terminal and optical network unit
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, fiber to the home) as the inevitable choice of Access Network.In the specific implementation 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, optical line 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 is according to the difference of concrete technology, can be divided into many types again, Gigabit Passive Optical Network (GPON wherein, Gigabit Passive Optical Network), owing to have higher bandwidth efficiency, its synchronization timing mechanism is continued to use traditional SDH (Synchronous Digital Hierarchy) (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.
FSAN network (FSAN, Full Service Access Network) the descending employing 10G bps of white paper suggestion sends, consider that the above burst of 5G bps sends and the burst reception realizes that difficulty is bigger, the equipment cost is higher, less stable, and the burst of 2.5G bps sends and the burst reception is easier to realize, simultaneously can partly reuse existing ripe device, 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 by 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 the up-downgoing symmetry, so uply can adopt 4 * 2.5G.
May occur the unbalanced problem of load in above-mentioned up multi-wavelength system, promptly the uplink traffic of certain wavelength is very big even surpass to handle load, and other wavelength may 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 registering, ONU divides into groups for it, ONU-ID, the Alloc-ID of same group of interior ONU, GEM port-ID must be unique, and these signs can be identical between the different grouping.Be subjected to 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 may lay respectively in the different groupings.
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 different ONU grouping between load balance.
Embodiments of the invention provide a kind of passive optical network, comprise optical line terminal OLT and optical network unit ONU; Wherein,
Described OLT is used to monitor the uplink traffic of at least one ONU, and the uplink traffic of described 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, determine to carry out the ONU that wavelength is adjusted, generate wavelength and adjust message, and send to the ONU that described needs carry out the wavelength adjustment;
Described ONU is used to receive the wavelength that comes from described OLT and adjusts message, adjusts message according to described wavelength, 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,
Described OLT is used to monitor the downlink traffic of at least one ONU, and the downlink traffic of described each ONU that obtains according to monitoring counts the downlink traffic of each ONU grouping; According to predetermined condition, judge between the ONU grouping the unbalanced situation of downlink traffic whether occurred; When the unbalanced situation of downlink traffic having occurred, definite ONU that need divide into groups to adjust generates grouping and adjusts message, and sends to the ONU that described needs divide into groups to adjust;
Described ONU is used to receive the grouping that comes from described OLT and adjusts message, adjusts message according to described grouping, divides into groups accordingly to adjust.
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,
Described traffic monitoring module is used to monitor the uplink traffic of at least one optical network unit ONU, and the uplink traffic of described 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 described load balancing adjusting module to carry out respective handling;
Described load balancing adjusting module, receive the indication of described traffic monitoring module after, determine to carry out the ONU that wavelength is adjusted, generate wavelength and adjust message, send described wavelength and adjust 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,
Described traffic monitoring module is used to monitor the downlink traffic of at least one optical network unit ONU, and the downlink traffic of described each ONU that obtains according to monitoring counts the downlink traffic of each ONU grouping; According to predetermined conditions, judge the situation that whether has occurred the mass flow discrepancy weighing apparatus between the ONU grouping; When the situation of mass flow discrepancy weighing apparatus having occurred, indicate described load balancing adjusting module to carry out respective handling;
Described load balancing adjusting module, receive the indication of described traffic monitoring module after, determine to generate the ONU that need divide into groups to adjust grouping and to adjust message, send described grouping and adjust 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 and adjusts message, described load balancing is adjusted forwards give the load balancing adjusting module;
Described load balancing adjusting module is used for adjusting message according to the described load balancing that receives, and with newly assigned wavelength or packet number, replaces original wavelength or packet number of preserving, 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 uplink traffic of each up wavelength correspondence;
When the unbalanced situation of uplink traffic occurring between the described up wavelength, determine to carry out the ONU that wavelength is adjusted, generate corresponding wavelength and adjust message;
Described wavelength is adjusted message send to the ONU that described needs carry out the wavelength adjustment, the ONU that indicates described 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 described each ONU that obtains, count the downlink traffic of ONU grouping;
When the situation of mass flow discrepancy weighing apparatus occurring between the described ONU grouping, definite ONU that need divide into groups to adjust generates corresponding grouping and adjusts message;
Message is adjusted in described grouping sent to the ONU that described needs divide into groups to adjust, the ONU that indicates described needs to divide into groups to adjust divides into groups to adjust.
Beneficial effect of the present invention:
By implementing embodiments of the 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 has the ONU grouping, the unbalanced problem of load that may occur between the different ONU groupings, the bandwidth resources of system are fully used; Utilize embodiments of the invention, can reuse existing part design of protocol and realization; Dynamically adjust up wavelength 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 as follows:
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; Described 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 adjust strategy according to certain wavelength, determine to carry out the ONU that wavelength is adjusted, generate corresponding wavelength then and adjust message; The ONU that carries out the wavelength adjustment to described needs sends described wavelength adjustment message, indicates described ONU to revise employed up wavelength when sending data;
In this step, when determining 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 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; Also can select the up wavelength of certain ONU is adjusted into other wavelength in conjunction with the priority of different ONU.The form that the message of adjusting wavelength described here can adopt is PLOAM (Physical Layer OAM) message or OMCI (ONU Management and Control Interface) message.Concrete can adopt following several mode:
1) use the reserved field of Assign_ONU-ID PLOAM message to carry described wavelength adjustment strategy, concrete form is as follows:
Byte number Content Describe
??1 ??11111111 Broadcast to all ONU transmissions
??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 as follows:
Byte number Content Describe
??1 ??ONU-ID To appointment
??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 and adjusts strategy;
4) newly-increased a kind of OMCI message is used for carrying described wavelength and adjusts strategy.
Step 303, described ONU adjust message according to described wavelength after receiving described wavelength adjustment message, revise employed up wavelength when sending data, and the up wavelength that is about to current use is adjusted into new up wavelength, with the upstream data of carrying transmission; 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 Business 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 described OLT after finishing 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 described 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 described 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 registering, ONU divides into groups for it, ONU-ID, the Alloc-ID of same group of interior ONU, 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 having the ONU grouping, the unbalanced situation of uplink traffic that may occur between the different ONU groupings comprises that step is as follows:
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 of ONU grouping,, judge between the different ONU groupings the unbalanced situation of downlink traffic whether occurred according to predetermined conditions; Described predetermined conditions for example may be prescribed as: the difference between the downlink traffic of different ONU groupings can not surpass a pre-set threshold; Also may be prescribed as: the downlink traffic of each ONU grouping can not surpass a pre-set threshold, or the downlink traffic of each ONU grouping can not be lower than a pre-set threshold; Can also stipulate a upper limit threshold and lower threshold simultaneously for the downlink traffic of each ONU grouping, 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 described OLT judges the situation that the mass flow discrepancy weighing apparatus occurred, can adjust strategy according to certain grouping, the ONU that definite needs divide into groups to adjust, generate grouping then and adjust message, message is adjusted in described grouping sent to the ONU that described needs divide into groups to adjust, indicate described ONU to divide into groups to adjust;
In this step, when determining the ONU that need divide into groups to adjust, described grouping adjustment strategy specifically can be: for the ONU in the same ONU grouping 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 mode:
1) use the reserved field of Assign_ONU-ID PLOAM message to carry described grouping adjustment strategy, concrete form is as follows:
Byte number Content Describe
??1 ??11111111 Broadcast to all ONU transmissions
??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 as follows:
Byte number Content Describe
??1 ??ONU-ID To appointment
??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 grouping and adjusts strategy;
4) newly-increased a kind of OMCI message is used for carrying described grouping and adjusts strategy.
Step 403, after ONU that described needs divide into groups to adjust receives that message is adjusted in described grouping, adjust message according to described grouping, adjust the grouping under the described ONU.Adjust the ONU after dividing into groups,, receive only the GTC frame that belongs to new grouping at down direction; At the GTC frame of up direction transmission based on new grouping.Thereby can between different ONU groupings, realize load balancing.
In the present embodiment, when the PON system carries user service data, use GEM port-ID to identify different Business Streams, when between different ONU groupings, 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 finish the grouping adjustment, generate and adjust response message, send described adjustment response message to described OLT;
Step 405, described OLT refresh the relevant entries in the ONU registration table after receiving the adjustment response message that comes from described 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 described 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, described OLT200 and a plurality of optical network unit ONU 100 communicate;
In the up PON system of multi-wavelength, at the unbalanced situation of uplink traffic that occurs between the up wavelength of difference, system embodiment provided by the invention can for:
Described OLT200 is used to monitor the uplink traffic of at least one ONU100, and the uplink traffic of described 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, determine to carry out the ONU that wavelength is adjusted, generate wavelength and adjust message, and send to the ONU that described needs carry out the wavelength adjustment;
Described ONU100 is used to receive the wavelength that comes from described OLT200 and adjusts message, adjusts message according to described wavelength, 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 described 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 respective handling; Can be about described 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 adjust strategy according to certain wavelength, determine to carry out the ONU that wavelength is adjusted, generate wavelength then and adjust message, 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.Wavelength described here is adjusted strategy can be referring to the description of previous methods embodiment; The form that the message of adjusting described wavelength can adopt is PLOAM message or OMCI message.Several modes that specifically can adopt can repeat no more here with reference to the description of top method embodiment.
Described GTC becomes frame module 201, receives after the wavelength that comes from described load balancing adjusting module 203 adjusts message, described wavelength is adjusted message be carried in the GTC frame, sends to and need carry out the ONU that wavelength is adjusted.
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 and adjusts message, described wavelength is adjusted forwards give load balancing adjusting module 102;
Described load balancing adjusting module 102 can be used for adjusting message according to the described wavelength that receives, and uses newly assigned wavelength, 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 adjusts response message, is transmitted to described GTC frame processing module 101, is carried in the GTC frame and sends to OLT.
In having the PON system of ONU grouping, at the situation of the mass flow discrepancy weighing apparatus that occurs between the different ONU groupings, system embodiment provided by the invention can for:
Described OLT is used to monitor the downlink traffic of at least one ONU, and the downlink traffic of described each ONU that obtains according to monitoring counts the downlink traffic of each ONU grouping; According to predetermined condition, judge between the ONU grouping the unbalanced situation of downlink traffic whether occurred; When the unbalanced situation of downlink traffic having occurred, definite ONU that need divide into groups to adjust generates grouping and adjusts message, and sends to the ONU that described needs divide into groups to adjust;
Described ONU is used to receive the grouping that comes from described OLT and adjusts message, adjusts message according to described grouping, divides into groups accordingly to adjust.
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 described each ONU that obtains according to monitoring counts the downlink traffic of each ONU grouping; According to predetermined conditions, judge the situation that whether has occurred the mass flow discrepancy weighing apparatus between the ONU grouping; When the situation of mass flow discrepancy weighing apparatus having occurred, indicate described load balancing adjusting module to carry out respective handling; Can be about described 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 adjust strategy, determine the ONU that need divide into groups to adjust according to certain grouping, generate grouping then and adjust message, 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.Strategy is adjusted in grouping 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 modes that specifically can adopt can repeat no more here with reference to the description of top method embodiment.
Described GTC becomes frame module 201, receives after the grouping that comes from described load balancing adjusting module 203 adjusts message, message is adjusted in described grouping be carried in the GTC frame, sends 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 grouping and adjusts message, forwards is adjusted in described grouping given load balancing adjusting module 102;
Described load balancing adjusting module 102 is used for adjusting message according to the described grouping that receives, and uses newly assigned packet number, replaces original packet number of preserving, and carries out the load balancing adjustment; Described load balancing adjustment is specially: adjust message according to described grouping, adjust the affiliated grouping of described ONU.Adjust the ONU after dividing into groups,, receive only the GTC frame that belongs to new grouping at down direction; At the GTC frame of up direction transmission, thereby can between different ONU groupings, realize load balancing based on new grouping.
In addition, described load balancing adjusting module 102 can also be used for generating adjusts response message, is transmitted to described GTC frame processing module 101, is carried in the GTC frame and sends to OLT.
Accompanying drawing 8 shows the cut-away view that the mode of adjusting with grouping is carried out the ONU of load balancing, 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 in 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.
By implementing embodiments of the 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 has the ONU grouping, the unbalanced problem of load that may occur between the different ONU groupings.The bandwidth resources of system are fully used.Utilize embodiments of the invention, can reuse existing part design of protocol and realization; Dynamically adjust up wavelength or packet number, strengthen the networking configuration flexibility, thus realized between the different up wavelength effectively or different ONU grouping between equally loaded.
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 according to the specific embodiment of the present invention just to play an exemplary role, not in order to restriction protection scope of the present invention.

Claims (10)

1, a kind of passive optical network is characterized in that, comprises optical line terminal OLT and optical network unit ONU; Wherein,
Described OLT is used to monitor the uplink traffic of at least one ONU, and the uplink traffic of described 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, determine to carry out the ONU that wavelength is adjusted, generate wavelength and adjust message, and send to the ONU that described needs carry out the wavelength adjustment;
Described ONU is used to receive the wavelength that comes from described OLT and adjusts message, adjusts message according to described wavelength, carries out corresponding wavelength adjustment.
2, a kind of passive optical network is characterized in that, comprises optical line terminal OLT and optical network unit ONU; Wherein,
Described OLT is used to monitor the downlink traffic of at least one ONU, and the downlink traffic of described each ONU that obtains according to monitoring counts the downlink traffic of each ONU grouping; According to predetermined condition, judge between the ONU grouping the unbalanced situation of downlink traffic whether occurred; When the unbalanced situation of downlink traffic having occurred, definite ONU that need divide into groups to adjust generates grouping and adjusts message, and sends to the ONU that described needs divide into groups to adjust;
Described ONU is used to receive the grouping that comes from described OLT and adjusts message, adjusts message according to described grouping, divides into groups accordingly to adjust.
3, a kind of optical line terminal is characterized in that, described optical line terminal comprises traffic monitoring module and load balancing adjusting module; Wherein,
Described traffic monitoring module is used to monitor the uplink traffic of at least one optical network unit ONU, and the uplink traffic of described 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 described load balancing adjusting module to carry out respective handling;
Described load balancing adjusting module, receive the indication of described traffic monitoring module after, determine to carry out the ONU that wavelength is adjusted, generate wavelength and adjust message, send described wavelength and adjust 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 that comes from described load balancing adjusting module and adjusts message, described wavelength adjustment message is carried in the GTC frame send.
5, a kind of optical line terminal is characterized in that, described optical line terminal comprises traffic monitoring module and load balancing adjusting module; Wherein,
Described traffic monitoring module is used to monitor the downlink traffic of at least one optical network unit ONU, and the downlink traffic of described each ONU that obtains according to monitoring counts the downlink traffic of each ONU grouping; According to predetermined conditions, judge the situation that whether has occurred the mass flow discrepancy weighing apparatus between the ONU grouping; When the situation of mass flow discrepancy weighing apparatus having occurred, indicate described load balancing adjusting module to carry out respective handling;
Described load balancing adjusting module, receive the indication of described traffic monitoring module after, determine to generate the ONU that need divide into groups to adjust grouping and to adjust message, send described grouping and adjust 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 that comes from described load balancing adjusting module and adjusts message, described grouping adjustment message is carried in the GTC frame send.
7, a kind of 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 and adjusts message, described load balancing is adjusted forwards give the load balancing adjusting module;
Described load balancing adjusting module is used for adjusting message according to the described load balancing that receives, and with newly assigned wavelength or packet number, replaces original wavelength or packet number of preserving, and carries out the load balancing adjustment.
8, optical network unit according to claim 7 is characterized in that,
Described load balancing is adjusted message, comprises that wavelength is adjusted message or message is adjusted in grouping.
9, a kind of method that realizes load balancing is characterized in that, comprising:
Monitor the uplink traffic of at least one optical network unit ONU, calculate the uplink traffic of each up wavelength correspondence;
When the unbalanced situation of uplink traffic occurring between the described up wavelength, determine to carry out the ONU that wavelength is adjusted, generate corresponding wavelength and adjust message;
Described wavelength is adjusted message send to the ONU that described needs carry out the wavelength adjustment, the ONU that indicates described needs to carry out the wavelength adjustment revises employed up wavelength when sending data.
10, a kind of 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 described each ONU that obtains, count the downlink traffic of ONU grouping;
When the situation of mass flow discrepancy weighing apparatus occurring between the described ONU grouping, definite ONU that need divide into groups to adjust generates corresponding grouping and adjusts message;
Message is adjusted in described grouping sent to the ONU that described needs divide into groups to adjust, the ONU that indicates described needs to divide into groups to adjust divides into groups to adjust.
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